Female Authors and the Novel an Example of the Topic Literature Essays by

Female Authors and the Novel by Expert BrilliantEssays | 02 Dec 2016 The contribution of female authors towards the development of the novel is significant. Indeed it can be argued that feminine sensibility plays a key role here. G K Chesterton describes the novel as a feminine art form, and he explains that it is the female eye for homely detail, as well as the talent to depict the intricacies of relationships, that make it so (39). These qualities are important because they serve to counteract the male tendency towards philosophy and idealism. Such tendencies must be overcome because the novel is aiming for an inpidualistic and democratic voice which is beyond all factionalism. Need essay sample on "Female Authors and the Novel" topic? We will write a custom essay sample specifically for you Proceed The search for an inpidual voice had been the aim of literature since the Protestant Reformation. It was the aim too of the Enlightenment; but the practical effect was only to introduce the rigid formality of classicism. So the constraints of the Church had been replaced by just another form of constraint. Such constraints were overcome in the end by the female prose writers, and gradually over a long period. In this respect we will examine the two writers Aphra Behn and Mary Shelley, separated by a century and a half. The former presages the advent of the novel, while the latter perfects the form and paves the way for the great Victorian age of the novel. Classicism was the key barrier to the development of the novel. All efforts towards informality were frowned upon by the stalwarts of Augustan literature, led by Dryden and Pope, so the novel was perforce directed underground. Here it flowered in the hands of the women writers, who were mostly ignored because they concentrated on sentimental romance, and appealing to woman readers alone. Daniel Defoe is now regarded as the first proper novelist, but it is plain to see that he has adopted a form established by the female writers, who produced mostly trifling and salacious romances. Such a description may be applied to Aphra Behns Love Letters Between a Nobleman and His Sister, but it is also notable for being the first epistolary novel. Her reputation, however, rests on Oroonoko, a love story involving an African prince captured by slave traders. Though not yet a proper novel, it contains many innovations that point in that direction. Behn assumes a conversational tone with the readers in places, inspiring familiarity. It also contains an omniscient voice of narration, which was to become the most distinctive characteristic of the novel proper. However, she feels obliged to explain her omniscience, and so the narrator is tangentially involved in the story itself. She knows all the incidents in Africa because she has lived the slave plantation and has conversed with the African prince. By the time Mary Shelley writes Frankenstein, the novel form has almost come into its own element, and its history boasts such great novelists as Defoe, Fielding, Richardson, Sterne, Smollet and Austen. Nevertheless, Shelleys original contribution in not insignificant. The voice of the novel reflects inpidual expression, and this has been largely perfected by this point. Shelley goes on to tackle the theme of inpidualism itself. It is the story of a mad scientist who cuts himself off from the world in order to create a being from assembles and inanimate organs. We discover similarities between the project of the mad scientist and the project of the novelist giving life to his fictional creations. The novelist functions as an inpidual, and his is probably the loneliest occupation of all. At the same time it is his task to create inpiduals, purely from the imagination. Shelleys theme is at heart the mutual dependency of creator and creature. Though she is outwardly concerned with the misuse of science, and of the terrible consequences of mechanization, the underlying theme remains that of inpidualism. In this sense we may interpret her novel as an exploration of the limits of the novel. In conclusion, female writers can be said to be largely responsible for the development of the novel from the Restoration onwards. The evolution of the novel has avoided the limelight, yet the novel has been the primary vehicle for the advance of inpidualism. Only with the Industrial revolution and the rise of democracy does the novel burst forth as the principal mode of literature. Aphra Behn and Mary Shelley were key proponents in novels development. Works Cited Behn, Aphra. Oroonoko. Ed. Janet M. Todd. New York: Penguin Classics, 2003. Chesterton, Gilbert Keith. The Victorian Age in Literature. Oxford: Oxford University Press, 1966. Shelley, Mary. Frankenstein. New York: Collector's Library, 2004.

Mideval heros essays

Mideval heros essays During the medieval era, many different heroes proved to be chivalric. Three of these heroes are Beowulf, Sir Gawain, and King Arthur. All these men have won great battles, which in turn endow them with hero status among their faithful subjects. These three heroes possess chivalric qualities, but none of them are perfect. All three have weaknesses and strengths, which give them the ultimate challenge of proving themselves chivalric. Beowulf exhibits many weaknesses and strengths, which he portrays in battle. He doesnt believe in using weapons in battle. When he fights the dragon, he becomes mortally wounded because of his old age and slow reflexes. On the might of his hand, as a man must do who thinks to win in the welter of battle enduring glory; he fears not death (Shaw 1). His beliefs have proven to be unwise. He should have realized sooner that letting his fate overthrow his wisdom would get the best of him in the end. There is no question that he is a great warrior, however, he lets his courage overtake his good judgment. The infamous killer fought for his freedom, wanting no flesh but retreat, desiring nothing but escape; his claws had been caught, he was trapped (Anonymous 31-32). By leading his army into successful battles, Beowulf proves his chivalry. He understands what needs to be done to win, and this is one of his greatest strengths. However, while Beowulf has good intentions, his wea knesses outweigh his strengths. Sir Gawain, from the story SGGK, also has many strengths and weaknesses. When the Green Knight challenges King Arthur, Sir Gawain tells him: This affair is too foolish to fall you (Shaw 1). Sir Gawain knows that the possible death of the king would be destructive to the community. His honor is set by his loyalty to his king. His downfall comes soon after: When the lord returns on the third day, Gawain gives him a kiss but does ...

Ethics in Cyberspace Essay Example | Topics and Well Written Essays - 1250 words

Ethics in Cyberspace - Essay Example Cybercrime is one is one of the problems that many people using Internet face. It is more acceptable to put an apparent useful program, which is a harmless virus for downloading than selling the details of customers to the third party. This is because the program may be useful to people, and this is a matter of trying to gain experience. Since, the program is useful and harmless, the Internet user may benefit from the program in case it succeeds. Hester and Ford reveal varied cybercrimes and most of them are unethical. Examples in this essay describes such programs. A virus that may destroy someone’s information is a crime that many technology hackers commit. Although, this is more acceptable than selling a customer’s information to the third party because some many people protect their computers with anti-virus. In conclusion, it is more acceptable to put an apparent useful program, which is a harmless virus for download on a Website than selling customer details to th ird party marketing companies without telling the customers. This is because the computer expert may create useful program that may helpful Internet users. Moreover, the computer experts may want to test their capability in technology which is acceptable. Others experts may want to reveal their talent through creating of useful programs in the Internet. Sending useful programs that are harmless is vital because they may not infect data files. Ethical hacking is help because it enables ethical hackers to create vital programs that are useful.

Intro to business Past exam paper Coursework Example | Topics and Well Written Essays - 1000 words

Intro to business Past exam paper - Coursework Example It includes variables like suppliers, customers, competitors and public. On the other hand, macro factors are those that have an indirect impact on the business, also known as PESTEL. It includes factors that create opportunities and threats to business and is categorized as the far environment. These include variables such as political, environmental, socio-cultural, technological, economic and legal. (ii) The purpose of macro environment analysis is to determine the opportunities and threats to the farming industry as a whole and those outside the control of the company. External factors that affected the agricultural industry includes economic, technological, socio-cultural, environmental and political. All factors were considered as they play a part in determining the overall business environment. Economic factors include inflation rate, growth in spending power, exchange rates and economic growth. Opportunities can be that higher national income growth may boost demand for a fir m's products and chances for expansion increases. On the other hand, a strong currency may make exporting more difficult as prices in terms of foreign currency rises. Also inflation may provoke higher wage demands from employees and raise costs. With respect to technological factors, internet played a crucial role and gave way to online orders and delivery systems. Opportunities in the future may include complex operational systems installation that may cut down on labor costs, improve quality and lead to new innovations and make it attractive as a segment. Threats can be the probable advancement of technology making prior systems obsolete. Socio- cultural factors played an equally important role in farming industry. Change in trends where consumers demand for fresh products provided business opportunities to farmers and provide scope for innovation. Entertainment dimension added onto the development of this industry. However, trends changes and there exist a niche market that deman ds such products which might get concentrated. This can thus pose as a threat to agricultural industry. In Environmental factors, Physical factors of climate relief and soils affected the business positively. With major climate changes and greater environmental awareness this external factor is becomes a significant issue for firms to consider. However, going for environmental friendly products and processes can create business opportunities now and in the future as well. Threats can be Laws on waste disposal, energy consumption, pollution monitoring etc. that would add to the cost of the businesses operating. 2. (i) Two main sources of U.K. laws include Legislation (Statue Law), Common Law (Judge-made Law) and the European Communities law. Legislation are most authoritative and passed by parliament whereas common law includes cases where there was no judicial precedent but which were known to exist since time memorial. Company law, or corporate law, of U.K. can be broken down into two main fields. Corporate governance in the UK mediates the rights and duties among shareholders, employees, creditors and directors. Corporate finance concerns the two money raising options of incorporators the above mention laws can directly affect the operations of Ford Company in UK. (ii) There are broadly four types of business ownership. The most basic form is sole proprietorship. It is owned by one person who is the in charge of day-to-day activities of the business and owns all the assets and bears

OB report Essay Example | Topics and Well Written Essays - 2000 words

OB report - Essay Example However, change management is also a part of increasing motivation, which should also be considered. McDonalds has to take immediate actions if the company wants to enhance the motivation level of its employees. The purpose of the report is to evaluate the factors that drive towards demotivation of the employees working in McDonalds. The aim of the report is to give possible solutions to the motivational issues faced by McDonalds based on motivational theories. The focus of this study is to find out the different opinions and perspectives of the employees working in McDonalds. Employees working in countries like UK, US, China & Germany, are facing many problems, which leads to demotivation. Employee views are always in contradiction with employers, and this contradiction creates issues and conflicts. Thus, the study is focused to find out the factors leading to demotivation and analyse the possible solutions concerned. McDonalds, as an organisation is serving 70M customers globally and the company has employed around 1.9M people globally (McDonalds, 2014a). Thus, research of a multinational company will help in increasing the knowledge about foreign boundaries and parameter. Moreover, the â€Å"McDonalds Legislation† which was acquired by McDonalds is new legislation in the global context. Thus, research on such organization will help in understanding the pattern as they become trendsetter. McDonalds is a huge name as a foodservice retailer globally. McDonalds has over 35,000 locations serving 70M customers globally in 100 countries. Independent owners operate more than 80% of the McDonalds franchises (McDonalds, 2014b). The goal of McDonalds is to become the customer’s favourite dinning place where they can get their core favourites (Singer, 2014). McDonalds acquire â€Å"McDonalds Legislation† according to which they can pay 20% less to the teenage employees

Procedures For Drill String Design Engineering Essay

Procedures For Drill String Design Engineering Essay This chapter presents general procedures for drill string design. The design aspects of critical importance and factors controlling drill pipe selection are highlighted. The term Drill Stem is used to refer to the combination of tubulars and accessories that serve as a connection between the rig and the drill bit (RGU lecture slides). It consists mainly of Drill Pipe, Drill Collars (DC) and Heavy Weight Drill Pipes (HWDP) and accessories including bit subs, top drive subs, stabilisers, jars, reamers etc. Drill stem is often used interchangeably with the term Drill String which actually refers to the joints of drill pipe in the drill stem. For the purpose of this report, Drill String will be used to refer to the string of drill pipes that together with drill collars and heavy weight drill pipe make up the drill stem see fig 3.1. 3.1 DRILL STEM COMPONENT DESCRIPTION 3.1.1 Drill Pipe The drill pipes are seamless pipes usually made from different steel grades to different diameters, weights and lengths. They are used to transfer rotary torque and drilling fluid from the rig to the bottom hole assembly (drill collars plus accessories) and drill bit. Each drill pipe is referred to as a joint, with each joint consisting of a pipe body and two connections (see fig 3.2). Drill pipe lengths vary, and these different lengths are classified as ranges, the available or more common ranges include: Range 1: 18 22 ft Range 2: 27 30ft Range 3: 38 40ft. Drill Stem. Fig 3.1: Drill Stem with components. (Heriott Watt University lecture Notes: Drilling Engineering) Drill pipes are also manufactured in different sizes and weights which reflects the wall thickness of the drill pipe. Some common sizes and their corresponding weights include 31/2 in. 13.30 lb/ft and 4 1/2in. 16.60 lb/ft. The indicated weight is the nominal weight in air (pipe body weight excluding tool joints) of the drill pipe. A complete listing of API recognised drill pipe sizes, weight and grades are published in the API RP 7G. The drill pipe grade is an indication of the minimum yield strength of the drill pipe which controls the burst, collapse and tensile load capacity of the drill pipe. The common drill pipe grades are presented in the table below Grade Yield Strength, psi Letter Designation Alternate Designation D D-55 55,000 E E-75 75,000 X X-95 95,000 G G-105 105,000 S S-135 135,000 Table 3.1: Drill Pipe Grades. Drill pipes are often used to drill more than one well, therefore in most cases the drill pipe would be in a worn condition resulting in its wall thickness being less than it was when the drill pipe was brand new. In order to identify and differentiate drill pipes, they are grouped into classes. The different classes are an indication of the degree of wear on the wall thickness of the drill pipe. The classes can be summarised as follows according to API standards: New: Never been used, with wall thickness when to 12.5% below nominal. Premium: Uniform wear with minimum wall thickness of 80%. Class 2: Allows drill pipe with a minimum wall thickness of 70%. It is essential that the drill pipe class be identified in drill pipe use or design, since the extent of wear affects the drill pipe properties and strength. When specifying a particular joint of drill pipe, the class, grade, size, weight and range have to be identified, the specification could therefore appear thus: 5 19.5 lb/ft Grade S Range 2 Fig 3.2: Parts of Drill pipe. (Handbook for Petroleum and Natural gas) 3.1.2 Tool Joints Tools joints are screw type connections welded at the ends of each joint of a drillpipe. The tool joints have coarse tapered threads and sealing shoulders designed to withstand the weight of the drill string when it is suspended in the slips. Tool joints are of two kinds; the pin (male section) and the box (female section). Each drill pipe has a pin attached to one end and a box attached at the other end. This makes it possible for the pin of one joint of drill pipe to be stabbed into box of a previous drill pipe. There are several kinds of tool joints widely used: Joint Type Diagram Description Internal Upset (IU) Tool joint is less than the pipe. Tool joint OD is approximately the same as the pipe. Internal Flush (IF) Tool joints ID is approximately the same as the pipe. The OD is upset. Internal / External Upset (IEU) Tool joint is larger than the pipe such that the tool joint ID is less than the drill pipe. The tool joint OD is larger than the drill pipe. Table 3.2 Types of tool joints. (The Robert Gordon University Lecture Notes: Drill String Design) 3.1.3 Drill Collars Drill collars are thick walled tubes made from steel. They are normally the predominant part of the bottom hole assembly (BHA) which provides Weight on Bit (WOB). Due to the large wall thickness of the drill collars, the connection threads could be machined directly to the body of the tube, thereby eliminating the need for tool joints (see fig 3.3). Drill collars are manufactured in different sizes and shapes including round, square, triangular and spiral grooved. The slick and spiral grooved drill collars are the most common shapes used currently in the industry. There are drill collars made from non-magnetic steel used to isolate directional survey instruments from magnetic interference arising from other drill stem components. The steel grade used in the manufacture of drill collars can be much lower than those used in drill pipes since they are thick walled. Functions Provide weight on bit Provide stiffness for BHA to maintain directional control and minimise bit stability problems. Provide strength to function in compression and prevent buckling of drill pipes. Fig 3.3: Carbon Steel Drill Pipes. 3.1.4 Heavy Weight Drill Pipe Heavy weight drill pipes (HWDP) are often manufactured by machining down drill collars See fig 3.4. They usually have greater wall thickness than regular drill pipe. HWDP are used to provide a gradual cross over when making transition between drill collars and drill pipes to minimise stress concentration at the base of the drill pipe. These stress concentrations often result from: Difference in stiffness due to the difference in cross-sectional area between the drill collar and drill pipe. Bit bouncing arising from rotation and cutting action of the bit. HWDP can be used in either compressive or tensile service. In vertical wellbores it is used for transition and in highly deviated wells, it used in compression to provide weight on bit. Fig 3.4: Heavy Weight Drill Pipe. (Heriott Watt University lecture Notes: Drilling Engineering) 3.1.5 Accessories Drill Stem accessories include: Stabilisers: these are made of a length of pipe with blades on the external surface. The blades are spiral or straight, fixed or mounted on rubber sleeves to allow the drill string rotate inside. Functions of the stabiliser include: Stabilise the drill collars to reduce buckling and bending Ensure uniform loading of tricone bits to reduce wobbling and increase bit life. To provide necessary wall contact and stiffness behind the bit to induce positive side force to build angle when drilling deviated wells. Reamers: used in the BHA to enlarge the well bore diameter and ream out doglegs, key seats, ledges. Drilling Jars: incorporated in the BHA to deliver a sharp blow and assist in freeing the drill string should it become stuck. 3.2 DRILL STRING DESIGN The drill string design is carried out in order to establish the most efficient combination of drill pipe size, weight, and grades to fulfil the drilling objectives of any particular hole section at the lowest cost within acceptable safety standards. In order to design a drill string to be used in a particular hole section, the following parameters need to be established: Hole section depth Hole section size Expected mud weight Desired safety factors in tension and overpull. Desired safety factor in collapse Length of drill collars required to provide desired WOB including OD, ID and weight per foot. Drill pipe sizes and inspection class The drill string design has to meet the following requirement: The working loads (tension, collapse, burst) on the drill string must not exceed the rated load capacity of each of the drill pipes. The drill collars should be of sufficient length to provide all required WOB to prevent buckling loads on the drill pipe. The drill pipes used have to ensure the availability of sufficient fluid flow rate at the drill bit for hole cleaning and good rate of penetration. 3.2.1 Design Safety Factors Design safety factors are applied to calculated working loads to account for any unexpected service load on the drill string. They are used to represent any features that are not considered in the load calculations e.g. temperature and corrosion, thus ensuring that service loads do not exceed the load capacity of the drill pipe. Design safety factor values are often selected based on experience from operating within a particular area, the extent of uncertainty in the operating conditions e.g. when operating in HPHT conditions, a larger safety factor is applied than when operating in less harsh conditions. Some commonly used design safety values are illustrated in the table below Load Design Safety Factor Value Tension 1.1 1.3 Margin of overpull (MOP) 50,000 100,000. MOP of 400,000 have been used in ultra deep wells Weight on Bit 1.15 or 85% of available Weight on bit to ensure neutral point is 85% of drill collar string length measures from the bottom (API RP 7G) Torsion 1.0 (based on the lesser of the pipe body or tool joint strength) Collapse 1.1 1.15 Burst 1.2 3.2.2 Drill Collar Selection The drill collars are selected with the aim of ensuring that they provide sufficient WOB without buckling or putting the lower section of the drill string in compression. 3.2.2.1 Size selection Lateral movement of the drill bit is controlled by the diameter of the drill collar directly behind it. Therefore the size/diameter of the drill collar closest to the bit will be dependent on the required effective minimum hole diameter and the relationship can be given as When two BHA components of different cross-sectional areas are to be made up, it is essential that the bending resistance ratio (BRR) be evaluated. This is important because BHA components have tensile and compressive forces acting on them when they are bent in the well bore. These forces cause stress at connections and any location where there is a change in cross-sectional area. Therefore it is important to ensure that these stresses are within acceptable ranges. The bending resistance (BR) of a drill string component is dependent on its section modulus which is given as Z = section modulus, in3 I = second moment of area, in4 OD = outside diameter, in ID = inside diameter, in The BRR is used to express any change in BR and can be calculated using BRR should generally be below 5.5 and in severe drilling conditions, below 3.5. 3.2.2.2 Connections When selecting connections to be used with drill collars, it is essential to check that the BRR of the pin and box indicates a balanced connection. The BRR for drill collar connection is calculated as the section modulus of the box divided by the section modulus of the pin. The API RP 7G contains tables that can be used to determine BRR for any box and pin OD. BRRs of 2.5 have given balanced connections (RGU Lecture notes, 2005). 3.2.2.3 Weight on Bit The maximum weight on bit required is normally a function of the bit size and type. The rule of thumb is: Maximum WOB of 2000lbf per inch of bit diameter when using Polycrsyalline Diamond Compact bits (PDC) and mud motors. Maximum WOB of 5000lbf per inch of bit diameter when using tricone bits. Other factors controlling WOB include inclination, hole size and buckling. In vertical wellbores the length of drill collars required to provide a specified weight on bit is given by LDC = Length of Drill Collars, ft WOB = Weight of Bit, lb DFBHA = Safety factor to keep neutral point in drill collars. WDC = Weight per foot of Drill Collars, lb/ft Kb = Buoyancy Factor. The neutral point as described by (Mian, 1991) referring to Lubinksi, is the point that divides the drill stem into two portions, with the section above the neutral point in tension and that below in compression. Therefore in order to ensure that the entire length of drill pipes remain in tension, the neutral point of the drill stem has to be maintained within the drill collars. According to the API RP 7G, the height of the neutral point measured from the bottom of the drill collars will be 85% of the total length of drill collars used, with 85% being the safety factor. In inclined wellbores, the angle of inclination has to be taken into consideration when calculating the maximum WOB that can be applied without buckling the drill pipe. This is because although the WOB is applied at the inclination of the wellbore, this weight acts vertically, thus reducing the available weight at the bit. Therefore to allow for this reduction, the buoyed weight of the BHA would be reduced by the cosine of the well inclination, thus WOB in inclined holes is calculated with the formula All parameters remain as defined in equation 5; ÃŽÂ ¸ is the angle of inclination of the well. As a result of the vertically acting weight of the BHA, the drill string tends to lie on the low side of the hole and is supported to some extent by the wall of the well bore. Therefore the pipes above the neutral point could only buckle if the compressive forces in the drill string exceed a critical amount. This critical buckling force is calculated as follows Fcrit = critical buckling force, lb ODHWDP = outside diameter of HWDP, in. ODtj = maximum outside diameter of pipe, in. IDHWDP = inside diameter of HWDP, in. Kb = buoyancy factor. Dhole = diameter of hole, in. ÃŽËÅ" = hole inclination, degrees. Since HWDP are sometimes used to apply WOB in inclined wells, and drill pipes are sometimes used in compression, the critical buckling force is calculated for both HWDP and drill pipes. 3.2.3 Drill Pipe Selection Factors to be considered for drill pipe selection include: Maximum allowable working loads in tension, collapse, burst, and torsion. Maximum allowable dogleg severity at any depth in order to avoid fatigue damage in the drill pipe. Combined loads on the drill pipe. The loads considered when selecting drill pipes to be used in the drill string is dependent on the well depth, well bore geometry and hole section objectives. In shallower vertical wells, collapse and tension are of more importance than burst or torsion. Burst is normally not considered in most designs since the worst case for a burst load on the drill pipe would occur when pressuring the drillstring with a blocked bit nozzle, even with this condition, the burst resistance of the drill pipe is likely to be exceeded. Torsion is of less importance in vertical well bores because drag forces are at minimal amounts unlike in highly deviated wells. The dogleg severity of the well for both vertical and deviated wells is important because of increased fatigue in the drill pipe when it is rotated in the curved sections of the wellbore. A graphical method is recommended for drill pipe selection, with the loads plotted on a load versus depth graph. This makes it possible for loads at particular points on the drill string to be easily visualised, and any sections of the drill pipe that do not meet the load requirements are easily identified and redesigned. 3.2.3.1 Collapse Drill pipes are sometimes exposed to external pressures which exceed its internal pressures, thereby inducing a collapse load on the drill pipe. The worst scenario for collapse in a drill pipe is during drill stem tests when they are run completely empty into the wellbore. The collapse loads are highest at the bottom joint of the drill pipes, as a result, the collapse load would normally control the drill pipe grade to be used at the bottom of the drill string. The API specified collapse resistance for different sizes and grades of drill pipe assuming either elastic, plastic or transition collapse depending on their diameter to wall thickness ratio have been calculated and are published in the API RP 7G with the relevant formulae. The maximum collapse pressure on the drill pipe when it is completely empty can be calculated as follows: Pc = collapse pressure, psi MW = mud weight, ppg TVD = true vertical depth at which Pc acts, ft. On some occasions, the mud weight outside the pipe varies from that inside the pipe, also the fluid levels inside and outside the pipe may also vary. This situation could also induce collapse loads. The collapse loads induced by this scenario can be calculated thus L = Fluid depth outside the drill pipe, ft MW = Mud weight outside the drill pipe, ppg Y = fluid depth inside drill pipe, ft MW = Mud weight inside drill pipe, ppg. The value for Pc is then plotted on the collapse load graph as the collapse load line see fig 3.5. It is recommended practice to apply a design safety factor to the collapse load calculated from equations 8 or 9 (depending on expected scenarios) in order to account for unexpected additional loads as wells as unknown variables. The value of the design factor is often between 1.1 1.5 for class 2 drill pipes. According to (Adams, 1985) the design factor should be 1.3 to account for the fact that new drill pipes are often not used for drill stem tests. The value of the collapse load multiplied by the collapse design factor is plotted on the collapse load graph as the design line, this is then used to select an appropriate grade and weight of drill pipe to fulfil these load conditions. Fig 3.5: Sample Collapse load graph. 3.2.3.2 Tension Load The tensile load capacity of the drill string should be evaluated to ensure there is enough tensile strength in the topmost joint of each size, weight, grade and class of to support the weight of the drill string submerged in the wellbore, hence the need to include buoyancy in the calculations. There has to also be enough reserve tensile strength to pull the drill string out of the well if the pipe gets stuck. The stabiliser and bit weight can be neglected when calculating the drillstring weight. In a vertical wellbore, the forces acting on the drill string are tension from its self weight and the hydrostatic pressure from the fluid in the wellbore. The hydrostatic pressure in the wellbore exerts an upward force on the cross sectional area of the drill string, which is commonly referred to as buoyancy. Therefore the resulting tensile load on the drill string attached to drill collars, taking account of buoyancy is calculated as: FTEN = resultant tensile load on drill string, lb LDP = length of drill pipe, ft LDC = length of drill collars, ft WTDP = air weight of drill pipe, lb/ft WTDC = air weight of drill collars, lb/ft MW = Mud weight, ppg. ADC = Cross sectional area of drill collars, in2 FTEN is plotted on the tension load graph as the tensile load line. The tensile strength values for different sizes, grades and inspection classes of drill pipes are contained in the API RP 7G, and can be calculated from the equation: Fyield = minimum tensile strength, lb Ym = specified minimum yield stress, psi A = cross section area, in2 Fyield is plotted as the minimum tensile strength line on the tension load graph. However, these values (Fyield) are theoretical values based on minimum areas, wall thickness and yield strength of the drill pipes. Therefore, these values only give an indication of the stress at which a certain total deformation would occur and not the specific point at which permanent deformation of the material begins. If a pipe is loaded to the minimum tensile strength calculated from equation 11, there is the possibility that some permanent stretch may occur, thereby making it difficult to keep the pipe straight in the wellbore. In order to eliminate the possibility of this occurrence, 90% of the minimum tensile strength as recommended by the API (American Petroleum Institute), should be used as the maximum allowable tensile load on the drill pipe, i.e Fdesign = maximum allowable tensile load 0.9 = a constant relating proportional limit to yield strength. Fdesign is plotted on the tension load graph as the maximum allowable tensile load line. As with the collapse load, a design factor would be applied to the tensile loads to account for dynamic loads in the drill pipe which occur when the slips are set, as well as prevent the occurrence of pipe parting close to the surface. The product of FTEN and the design factor is plotted as the tension design load line in the tension load graph see fig 3.6. Margin Of Overpull A margin for overpull is added to the tension load to ensure there is sufficient tensile strength in the drill pipe when it is pulled in the event of a stuck pipe. This margin is normally 50,000 100,000lb, but in deeper wells margins of overpull have reached 300,000lb. The value obtained after adding the margin of overpull is also plotted on the tension load graph see fig 3.6. The difference between the calculated tensile load at any point in the drillstring (FTEN) and the maximum allowable tension load would also represent the available overpull. This value represents available tensile strength of the drill pipe to withstand any extra forces applied to the drill string when trying to release it from a stuck pipe situation. FTEN and Fa can also be expressed as a safety factor This safety factor is an indication of how much the selected drill pipe will be able to withstand expected service loads. Due to uncertainty with actual service loads and conditions, a safety factor greater than 1 is always required. Slip Crush Slip crushing is generally not a problem if the slips are properly maintained. However, it is necessary to apply a safety factor for slip crushing when designing the drill string. This helps account for the hoop stress (SH) caused by the slips and the tensile stress (ST) caused by the weight of the drill string suspended in the slips. This relationship between SH and ST can be represented by the following equation SH = hoop stress, psi ST = tensile stress, psi D = outside diameter of the pipe, in. K = lateral load factor on slips, Ls = length of slips, in. = slip taper usually 9 ° 27 45 z = arctan ÃŽÂ ¼ ÃŽÂ ¼ = coefficient of friction, (approximately 0.08) The calculated tensile load is multiplied by the slip crush factor () to obtain the equivalent tensile load from slip crushing: Ts = tension from slip crushing, lb TL = tension load in drill string, lb SH / ST = slip crush factor. Ts is also plotted on the tension load graph as the slip crush design line. Fig 3.6: Sample Tension load graph The general step-by-step procedure for drill pipe selection using the graphical method is given as 1. Calculate the expected collapse load on drill pipe and apply the collapse design safety factor to derive the design load. Use the result to select weight and grade of drill pipe that satisfy collapse conditions. Plot expected collapse load and design load on a pressure vs. depth graph. 2. Calculate maximum allowable tensile load for the drill pipe selected in (1) above. Also calculate tension load on the drill string including buoyancy effects. Plot the tension load, specified minimum yield strength, and maximum allowable tensile load values on axial load vs. depth graph. 3. Apply tension design factor, margin of overpull, and slip crush factor to the calculated tension load and plot the individual results on the axial load vs. depth graph. Of the three factors applied to the tension load, the one resulting in the highest value is selected as the worst case for tensile loads. 4. Inspect graph and re-design any sections not meeting the load requirements. When designing a tapered drill string, the maximum length of a particular size, weight, grade and class of drill pipes that can be used to drill the selected hole section with specified WOB can be calculated as: All parameters remain as defined in equation 10 and 11. Note that equation 16 is only used when the MOP design line is the worst case scenario for tensile loads. When slip crushing is the worst case, the formula below is used SF = safety factor for slip crushing. The lightest available drill pipe grade should be used first in order to ensure that that the heavier grades are used upper section of the drill string where tensile loads are the highest. 3.2.4 Dog Leg Severity Fatigue damage is the most common type of drill pipe failure. It is known to be caused by cyclic bending loads induced in a drill pipe when it is rotated in the curved sections of the wellbore. The rotation of the drill pipe in the curved hole sections induce stresses in the outer wall of the drill pipe by stretching it and increasing its tensile loads. Fatigue damage from doglegs tends to occur when the angle exceeds a critical value. This critical value can be calculated as: C = maximum permissible dog leg severity, deg/100ft E = Youngs modulus, psi (30 x 106 for steel, 10.5 X 106 for aluminium) D = Drill pipe outer diameter, in. L = half the distance between tool joints, (180 in, for range 2 pipe) T = tension below the dogleg, lb à Ã†â€™b = maximum permissible bending stress, psi. I = drill pipe second moment of area, = à Ã†â€™b, is calculated from the buoyant tensile stress (à Ã†â€™t) and is dependent on the grade of the pipe. à Ã†â€™t = T/A, where T is defined in equation 19, and A is the cross sectional area of the pipe body in in2. For grade E pipe, The results from equation 20 are valid for à Ã†â€™t values up to 67,000psi. For grade S pipe, The results from equation 21 are valid for à Ã†â€™t values up to 133,400psi. It is recommended that an allowable dogleg severity (DLS) versus depth chart be plotted for every hole section with a particular drill string design since DLS changes with depth. The chart is plotted with the DLS on the x-axis and depth on the y-axis (see fig 3.7). When DLS lies to the left of the line or below the curve, the drill pipe is in safe operating conditions, and when it falls above or to the right of the curve, it is in unsafe conditions. Fig 3.7: Allowable Dogleg Severity Chart. (Mian, 1991) 3.2.5 Torsion Drill pipe torsional yield strength is important when planning deviated wells and ultra deep wells. In deviated wells, increased drag forces acting on the drill string from its interaction with the wellbore increase torsional loads on the drill pipe. In deeper wells, it is important in stuck pipe situations, in order to know the maximum torque that can be applied to the drill string. The pipe body torsional yield strength when subjected to torque alone can be calculated from the equation: Q = minimum torsional yield strength, ft lb J = polar second moment of area, à Ã¢â€š ¬/32 (D4 d4) D = pipe OD in, d = pipe ID in. Ym = minimum yield strength, psi. 3.2.6 Combined Loads On The Drill String Collapse and Tension The collapse resistance of the drill pipe is often reduced when the drill pipe is exposed to both tension and collapse loads. This happens because tensile loads stretch the drill pipe thereby affecting its D/t (diameter -wall thickness ratio) which controls the collapse resistance of the drill pipe. In ultra deep wells, the effect of combined collapse and tension is experienced when function testing the Blow out Preventers (BOP). It is becoming common practice in ultradeep drilling to equip BOPs with test rams in order to enable the BOP be tested without setting plugs in the well head. This is done to save tripping time due to extreme well depths. An example given by (Chatar, 2010), using 65/8in 27.70lb/ft drill pipe showed that with 65/8in drill pipe having 860kips of maximum allowable tensile loads, at half of this load, the drill string is only capable of withstanding 4,500psi collapse loads, which is often not sufficient for ultradeep drilling BOPs. The corrected collapse resistance of drill pipes under tension can be calculated using the formula Where R represents the percentage of the collapse resistance left when the drill pipe is under tension, therefore in equation 25, the value for R is used to multiply the normal plastic collapse resistance of the pipe to give the collapse resistance under tension. R can also be determined graphically with the following steps 1. Calculate Z using equation 24 2. Enter the ellipse for biaxial stress (fig 3.8) on the horizontal axis with the value for Z and draw a vertical line to the ellipse curve. 3. Draw a horizontal line from the vertical line drawn in (2) above to the vertical axis and read off the value. 4. Use the value from (5) above to multiply the collapse resistance to get the corrected collapse resistance with tension. Fig 3.8: Ellipse of Biaxial yield Strength: Effect of tensile loading om collapse resistance. (RGU Lecture notes: Casing design) Combined tension and torsion The torsional yield strength of a drill pipe is significantly reduced when the pipe is under tension loads. The torsional yield strength of the drill pipe under tension can be calculated with the equation Q = minimum torsional yield strength under tension, ft lb J = polar second moment of area. D = pipe OD in, d= pipe ID in. Ym = minimum yield strength, psi P = total load in tension, lb A = cross sectional area, in2 3.2.7 Tool Joint Performance The makeup torque to be applied to the tool joints when connecting drill pipes is calculated as follows ID = inside diameter, in. OD = outside diameter, in. Values for X, M, B and Q for standard connections are presented in the table below Type of Connection X

Jane Eyre and Education in Nineteenth-century England Essay -- Jane Ey

Jane Eyre and Education in Nineteenth-century England Jane Eyre provides an accurate view of education in nineteenth-century England, as seen by an 1840s educator. The course of Jane's life in regard to her own education and her work in education are largely autobiographical, mirroring Charlotte Bronte's own life. Jane's time at Lowood corresponds to Charlotte's education at a school for daughters of the clergy, which she and her sisters Maria, Elizabeth and Emily left for in 1824. Jane went on to attend Miss Wooler's school at Roehead from 1831 to 1832, and returned to teach there for three years in 1935, just as Jane became a teacher at Lowood. Both Charlotte and Jane became governesses. The Lowood School is an accurate representation of a Charity School in the 1820s . The bad health conditions follow the conditions of the school the Brontes went to. The monitorial system of teaching it operates on coincides with the systems created by Joseph Lancaster and Andrew Bell. Lowood's system of a master teacher, under teachers, and monitors is consistent with Bell's complicated system. In addition, the brand of discipline implemented by Mr. Brocklehurst is much like that of Lancaster. Jane's horror at the harsh punishments at Lowood are meant to prompt similar reactions in the reader. Jane at first thinks she could not bear such punishment and is mortified when she must stand on a stool and is accused of being a liar. The disciplining of Jane was completely unfounded, the result of an accident. Most of the punishments at Lowood seem to be for minor and unavoidable infractions such as having dirty nails when the wash water was frozen. Jane sees these punishments as generally just being mean, and thinks that such mean people do ... ...ould receive work appropriate for his own age and ability. The passages which do show Jane at the school usually include praises of how well her students are doing and how the children of England are so much better than the children of the rest of the Europe. This belief also suggests that their education system is the best, including the newest form of schooling, the class school. While at first Lowood was an awful experience, Jane ended up getting a very good education, and went on to offer even better education to other children. Jane Eyre illustrates the evils one could face in the charity schools of the early nineteenth century and the development of that education system into a much better, more efficient system. Works Cited: Bronte, Charlotte. Jane Eyre. London, Penguin Books Ltd.: 1996. (Edited with an Introduction and Notes by Michael Mason).

Data integrity is essential for a company’s operations Essay

Describe various steps companies can use to ensure the integrity of its information. Just as the question states, data integrity is imperative to the success of a company’s operations. Data integrity is processing integrity which is one the five principles of systems reliability (Romney, & Steinbart, 2012, p. 274). For a company to be successful they must have a reliable system that is accurate, easily manipulated, timely, and valid (Romney, & Steinbart, 2012). Now that you know what data integrity is, we will discuss steps that company can take to ensure the information is accurate and valid. The first step that a company can take would be forms design, where they will sequentially prenumber all source documents to verify no documents are missing, and turnaround documents which are machine readable and do not include a possibility of human error (Romney, & Stein, 2012). The second step a company can take is utilizing data entry controls, which is performing several checks to ensure that the information is correct, one example would be a field check where the individual will determine whether the characters in a field are of the proper type (e.g. if you are expecting a zip code and you do not have numeric characters, there would obviously be an issue) (Romney, & Steinbart, 2012). The third step we will discuss is checking output controls. There processes would include users examining the system output verifying the information is reasonable and they are the intended recipients. In addition, users should periodically reconcile their reports and any other information including the general ledger to keep accurate up to date information (Romney, & Steinbart, 2012). By following these three steps/processes that I have discussed, companies will put themselves in a position to be the most successfully by accurately displaying the information. If they properly utilize these checks and balances, the possibility of any major issues is minimal and the likelihood of their business being successful substantially increases.

Minamata Disease

Minamata Disease This report will be informing you on the incident that occurred from Chisso ltd. dumping methyl mercury into the Minamata Bay causing a disease called the minamta disease. You will be learning where it occurred, and is there a treatment for the disease. Other information that is introduced is what are some of the many symptoms of the disease and what is the minamata disease is.What are the symptoms have having this disease? The many symptoms of the disease are numbness of the limbs and the area around the mouth. People who have the disease had difficulty with everyday movements, and also there occurred a lack or coordination weakness, and tremor, slowed and slurred speech, and altered hearing and vision. The symptoms worsened over time and led to general paralysis, involuntary movements difficulty in swallowing, brain damage and death.All in all it would be pleasant for someone to have te disease because you lose your life from not being able to do many everyday movements or thinking you'd usually do.3D model

Free Essays on IQ Info

A term referring to a variety of mental capabilities, including the ability to reason, plan, solve problems, think abstractly, comprehend complex ideas, learn quickly, and learn from experience. Throughout the 20th century scientists have debated the nature of intelligence, including its heritability and whether (and to what extent) it exists or is measurable. The 1994 publication of Richard J. Herrnstein and Charles Murray's volume The Bell Curve brought these debates to the forefront of public attention by discussing links between social class, race, and IQ scores, despite the fact that many have questioned the validity of IQ tests as a measurement of intelligence or a predictor of achievement and success. Although the assessment of mental abilities through standardized testing has had many detractors, especially over the past 30 years, the notion that intellect is a measurable entityalso called the psychometric approachlies at the heart of much modern theorizing about the nature of intelligence. A rudimentary forerunner to 20th-century intelligence testing was developed in the 1860s by Charles Darwin's younger cousin, Sir Francis Galton, who, inspired by On the Origin of Species, set out to prove that intelligence was inherited, using quantitative studies of prominent individuals and their families. Galton's work was followed in 1905 by that of French psychologist Alfred Binet, who introduced the concept of mental age, which would match chronological age in children of average ability. It would exceed chronological age in bright children and would be below in those of lesser ability. Binet's test was introduced to the United States in a modified form in 1916, and with it the concept o f the intelligence quotient (mental age divided by chronological age and multiplied by 100). In the meantime, one of the central concepts of the psychometric approach to intelligence had been introduced in England in 1904 by Charles Spearman, who ... Free Essays on IQ Info Free Essays on IQ Info A term referring to a variety of mental capabilities, including the ability to reason, plan, solve problems, think abstractly, comprehend complex ideas, learn quickly, and learn from experience. Throughout the 20th century scientists have debated the nature of intelligence, including its heritability and whether (and to what extent) it exists or is measurable. The 1994 publication of Richard J. Herrnstein and Charles Murray's volume The Bell Curve brought these debates to the forefront of public attention by discussing links between social class, race, and IQ scores, despite the fact that many have questioned the validity of IQ tests as a measurement of intelligence or a predictor of achievement and success. Although the assessment of mental abilities through standardized testing has had many detractors, especially over the past 30 years, the notion that intellect is a measurable entityalso called the psychometric approachlies at the heart of much modern theorizing about the nature of intelligence. A rudimentary forerunner to 20th-century intelligence testing was developed in the 1860s by Charles Darwin's younger cousin, Sir Francis Galton, who, inspired by On the Origin of Species, set out to prove that intelligence was inherited, using quantitative studies of prominent individuals and their families. Galton's work was followed in 1905 by that of French psychologist Alfred Binet, who introduced the concept of mental age, which would match chronological age in children of average ability. It would exceed chronological age in bright children and would be below in those of lesser ability. Binet's test was introduced to the United States in a modified form in 1916, and with it the concept o f the intelligence quotient (mental age divided by chronological age and multiplied by 100). In the meantime, one of the central concepts of the psychometric approach to intelligence had been introduced in England in 1904 by Charles Spearman, who ...

Cultural Event Report Essay Example | Topics and Well Written Essays - 500 words - 21

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The Price System Assignment Example | Topics and Well Written Essays - 500 words

The Price System - Assignment Example The cigarettes packed in packets were essential for large transactions because they attracted good offers from the smokers. However, the cigarettes were also not convenient for a currency because people smoked them during the low supply seasons (Radford 1945, p. 190). The other disadvantage is that some prisoners reduced the tobacco contents in the cigarettes to make their own hand-rolled cigarettes for resale. British households devise arrangements to share their washing machines because of the high demand that the machines attract in the neighbourhoods. It is apparent that most British do not like washing their clothes because of time limitations and the high prices charged at the laundries. As a result, they enjoy spending money on expensive durable goods that they use for a few hours each week, which are cheaper than acquiring the services of the launders. During the alcohol beverages prohibition in the US between 1920 and ‘33, whisky and gin were plentiful because the clients were willing to use the substitutes. It is apparent that the shortage of a product will increase the demand of the substitute commodities. This is because the clients were willing to consume any alcoholic drink that could help them overcome the thirst or enjoy their time. Price control is government’s intervention in the liberal markets in a bid to set the maximum and minimum charges for commodities. An example of the price control is the price ceiling, which the highest price to charge, while the price floor is the lowest cost to implement. In this regard, prices set by the government can cause either a shortage or a surplus in the economy. The property rights of people are the privileges to control the way in which particular resources will be used. This does not consider the owner of the property, whether it is possessed by an individual or the