The Temporary Guide Base Engineering Essay

The Temporary Guide Base Engineering Essay After the drilling units anchors have been deployed on the new location the first item lowered is the temporary guide base (the TGB). This serves as a foundation for all the other subsea equipment that will follow, and as an anchorage for the guideline cables on which that equipment will be run down to the sea-bed. The TGB is a circular, octagonal or square, flat, steel frame of about 100 square feet in area which has compartments in which ballast materials can be placed. The unit alone usually weighs about four tons, but it is heavily weighted with bags of cement, barite or other heavy materials before being lowered to the sea bed on the end of a string of drill pipe. A special tool for releasing the TGB when it is in position is fitted to the drill pipe string, and this connects with a slot in the steel guidebase frame. On the underside of the frame four spikes project to dig into the sea bed and firmly anchor the unit. Four wires are attached to the edges of the TGB, and when it has been landed these are tensioned up and used for guiding other items of equipment down to their locations above the TGB. There are also two smaller lines for running TV cameras down for monitoring operations from the doghouse on the drill floor. The guide line tensioners are large cylinders, installed in the cellar deck on the rig, that contain pistons which are positioned by air pressure. The amount of tension required on the guide lines is simply set by adjusting the air pressure. In the centre of the TGB frame is a wide circular aperture with a funnel shape projecting above it into which the bottom of another frame the permanent guide base will fit. The drill bit will commence drilling and all subsequent downhole operations will be conducted through this aperture. 3.0 THE PERMANENT GUIDE BASE The permanent guide base (PGB) is another heavy steel frame, about 3 tons in weight and square in shape, that has a wide central aperture and a tall post on each corner through which the four guidelines run. The PGB serves as a landing seat for the wellhead and as a guide for drilling tools and the blow-out preventer stack which is eventually located above the wellhead. The posts are used to locate the stack, which has arrangements to accept them within its own frame. The PGB is run down the guide lines to connect with the TGB, and there is a funnel-shaped projection around the aperture on its underside that inserts into the TGBs funnel-shaped top aperture and ensures an accurate fit. Beyond about 400 m water depth the guidewire system does not work too well so for deepwater a guideline less system using a capture funnel system is utilised. 4.0 THE WELLHEAD/CASING HANGAR SYSTEM The wellhead is a large, cylindrical device housing several internal fittings called casing hangars that are designed to suspend the required number and sizes of casing and tubing strings that will be used in the well. The wellhead/casing hangar locates through the holes in the two guide bases and fits into the top of the conductor casing after this has been run. It projects above the PGB, and is designed to connect with the BOP stack which is later run above it. The Subsea Wellhead is the main structural component which supports the loads generated during drilling operations and during production Operations. It is connected (welded) to the inner conductor (18  ¾) and is locked into the outer conductor, which itself is attached to the guide base. Over recent years two connection profiles have become the most frequently used. These are proprietary designs known as Vetco H-4 and the Cameron Clamp Hub profiles. Most UK drilling rigs are equipped with a single high pressure stack, though two stack systems were previously in use, to provide a low pressure connection at the 20 and high pressure for the 13 5/8 inch casing. The three main functions of a wellhead can be considered as :- To provide a location for suspension of casing strings. Each of the casing strings which run up through the well are physically suspended within the wellhead housing. Should the well be used for production, the production tubing is additionally supported and locked in position in the wellhead via the tubing hanger. To provide Sealing and Pressure Containment This sealing and containment takes place on two distinct areas, between the well and the environment and to provide isolation from between the casing and downhole structures. During drilling operations a Blow Out Preventer (BOP) is installed on the wellhead at the base of the Marine Drilling Riser. The BOP is mandatory and used to protect the rig and the environment at the seabed level in case of gas kick from the well, to avoid a Blow Out. Allows the installation of Flow Control Equipment Should the well be converted from an appraisal well into a future production (NORMAL CASE) or water injection well, the subsea Xmas Tree can be installed to provide flow control from the well or from the injection line or manifold. . For subsea wells, the wellhead is supported through the 30 inch housing/conductor which is cemented into the first/primary soil formation. The 30 inch housing then supports the internal wellhead housing with the subsequent internal casing strings, each one supported via a casing hanger at the wellhead with a seal mechanism. The 30 inch housing supports the permanent guidebase which forms the main guidance mechanism for equipment being deployed subsea to the wellhead, during drilling and completion operations. Four Guide Posts and guide lines are used down to 400m. For deeper waters guide lines are not practical and funnel down or up systems are deployed. The BOP stack and subsequently the Xmas Tree are connected to the wellhead by a hydraulically operated connector. The primary environmental loading on the wellhead occurs during the drilling phase, when a high varying bending moment is transmitted through the riser onto wellhead housing and then to the 30 inch housing/casing/formation through current, wave loads and drilling vessel movement. The wellhead housing is locked into the 30 inch wellhead and loads on the wellhead are transmitted into the 30 inch conductor. 6.0 OVERVIEW OF SUBSEA OPTIONS; SHALLOW AND DEEP WATERS The challenges to subsea production in the future are considerable, with solutions required to the economical extraction of oil and gas from ever deeper waters in remote locations. Deep water options are illustrated in Figures 19 A 19 B. There are a number of options currently open in the movement of oil and gas from well to shore, and there are some limitations. Availability of investment capital to achieve a profit from the expectation of sales of gas or oil in a depressed and volatile market. The adverse effects of hydrostatic pressure on sensitive subsea equipment. The limiting effects of hydrostatic pressure on the means of maintenance and intervention with subsea equipment. Mechanical limitations on the type of host. The limiting factors of distance between well and host. Surface climatic conditions affecting the host annual storm patterns, ice, etc. Subsea production equipment used to be much more expensive than land-based equipment, adapted for use on offshore platforms. This was by way of specification, manufacturing quality, complexity etc., as well as the requirements for specialist tools with which to run the equipment. Nowadays costs of subsea developments are very competitive to platform based systems. This is due to more than 15 years of operational experience, fabrication simplification, and competition coupled with the use of more simple functional specifications. An additional feature of subsea production systems is their designed ability to operate in deepwater (diver less) areas. The development of deepwater systems, the installation and operational support systems using ROVs has been a major set in recent years. In earlier years such diver less systems were more expensive that diver assisted systems, but the advances now make then very similar in cost. In fact diver less operations using ROVs can be more cost effective than the use of very costly divers (requiring all the life support systems and complex DSV). The purpose of subsea wellhead is To support BOP and seal with well casing during drilling à ¢Ã¢â€š ¬Ã‚ ¢ To support and seal the subsea production tree à ¢Ã¢â€š ¬Ã‚ ¢ To support and seal the well casing à ¢Ã¢â€š ¬Ã‚ ¢ To support and seal the production tubing hanger The three main functions of a wellhead can be considered as; i)To provide a location for suspension of casing strings; Each of the casing strings which run up through the well are physically suspended within the wellhead housing. Should the well be used for production or injection, the tubing is additionally supported and locked in position in the wellhead via the tubing hanger (T.H.) when conventional dual bore trees are used. (ii)To provide Sealing and Pressure Containment; This sealing and containment takes place on two distinct areas, between the well and the environment and to provide isolation from between the casing and the down hole completion structures. During drilling operations a Blow Out Preventor (BOP) is installed on the wellhead at the base of the Marine Drilling Riser. The BOP is mandatory and used to protect the rig and the environment at the seabed level in case of gas kick from the well, to avoid a Blow Out and the riser is mandatory to return the drilling fluids, etcà ¢Ã¢â€š ¬Ã‚ ¦ to the rig. Refer to additional figures in Lecture L 5 B. (iii)Allows the installation of Flow Control Equipment; Should the well be converted from an appraisal well into a future production (NORMAL CASE) or water injection well (or gas injection well), the subsea Xmas Tree can be installed to provide production flow control from the well or into the well from the injection line or manifold. In these notes, the emphasis is on the subsea wells drilled from a semi submersible or a drill ship. In the southern North Sea and in water depths generally up to 100 m, jack-up rigs are also used. These provide a fixed platform from which to drill the wells and the well can be directly tied back into the rig. During drilling operations, a high pressure riser system connects the well with the jack-up and no subsea B O P system is necessary. For subsea wells, the wellhead is supported through the 30 housing / conductor which is cemented into the first / primary soil formation. The 30 housing then supports the internal wellhead housing with the subsequent internal casing strings. Each one is supported via a casing hanger at the wellhead and with a seal mechanism. The 30 housing supports the Permanent Guide Base which forms the main guidance mechanism for equipment being deployed subsea to the wellhead, during drilling, completion operations and work over operations. Four Guide Posts and guide lines are used down to 500m .For deeper waters, guide lines are not practical and other guidance systems are in use with exploration drilling now reaching -2800m. Refer to section 6. The BOP stack and subsequently the Xmas Tree are connected to the wellhead by an hydraulic operated collet connector. Over recent years two connection profiles have become the most frequently used. These are proprietary designs known as Vetco H-4 and the Cameron Clamp Hub profiles. Most UK drilling rigs are equipped with a single high pressure stack, though two stack systems were previously in use, to provide a low pressure connection at the 20 and high pressure for the 13 5/8 casings. A single connection of the BOP stack to the wellhead is the generally accepted method. The primary environmental loading on the wellhead occurs during the drilling phase, when a high varying bending moment is transmitted through the riser onto wellhead housing and then to the 30 housing/casing/formation through current, wave loads and drilling vessel movements. It is now common policy to run the two top joints of 1  ½ wall thickness joints of 30 to provide the resistance to the anticipated loads, when previously, only 1 casing was considered. The wellhead housing is locked into the 30 conductor and loads on the wellhead are transmitted into it. In addition to the drilling loads the wellhead may be subjected to impact and snagging loads associated with construction activities and accidental incidents such as fishing trawl board impacts and pull over forces. These loads are transmitted through the production tree into the wellhead connector and through into the 30 conductor. SUBSEA XMAS TREES FUNCTIONS; 7.1 General; The Xmas Tree is the primary flow control system for fluid flow from or into the well. The flows which can be considered include the following :- (a) Production, produced fluids from the oil/gas/condensate bearing formation pass-up through the well tubing and the Xmas Tree. (b) Injection, treated, inhibited seawater is pumped from the host facility into the well to provide pressure support for the reservoir. Gas injection/disposal excess gas is pumped into an adjacent reservoir for temporary storage or in limited cases, pressure maintenance. Oil production with Gas lift, gas is pumped from the host facility, through the annulus to subsurface injection points in the tubing. The inclusion of gas into the produced fluid reduces the column density to allow the reservoir pressure to flow the well. It is a flow boosting technique but with a low efficiency.

Does A Modern Instance champion or disdain divorce?

A Modern Instance is a complex novel with an engrossing plot-line and a subtext of ideas that make it relevant, not only as a source for the moral questions of the Nineteenth century, but also for dilemmas faced today. One of the major questions that it raises is how far a person should remain true to marriage vows when the other partner has flagrantly broken them. To put it simply, should the heroine of the novel, Marcia, divorce her unfaithful husband, Bartley, who has abandoned her in Boston in order to seek adventures and freedom in the West? The novel asks whether an absolute or relative morality is most virtuous and/or most practical in a world in which people like Bartley are all too common. The dichotomy between â€Å"championing† and â€Å"disdaining† is not as simple as the title of this essay suggests. It seems clear that Howell’s sees the strength in traditional virtues while realizing that at times they need to be discarded. Thus in some ways he disdains divorce as a general precept while championing the need for it within extremely negative marriages. If one party to a marriage abandons it in favor of freedom, then does the marriage really exist? In the initial stages of the marriage it seem as though A Modern Instance champions the ideals of domestic harmony within marriage almost at any cost. So while Bartley acts in a feckless and lazy manner, refusing to pursue a career in law even though his education was paid for him, it seems as though Marcia will always forgive him. In this sense Howells paints a rather traditional portrait of â€Å"love is blind† and suggests that a marriage can work even under the most difficult of circumstances in which one party to it really is not worth much. The portrait of their marriage for much of the book implicitly disdains divorce as Marcia forgives Bartley everything. Forgiveness, even if it stems from either stupidity or blind love, is apparently better than any consideration of divorce. The idea that marriage is kind of Elyria that cannot never be bettered is exemplified by the important sub-plot involving Ben Halleck. Halleck went to college with Bartley and knows that he is not to be trusted. Halleck discovers, to his complete horror, that he loves Marcia, and ends up lending money to Bartley that he knows will never be returned as a kind of penance. If ‘love’, in its truest form, rather than the convention of marriage were more important within the world that   Howells is portraying, then Marcia and Halleck might at least think of starting an affair. But this does not happen. Instead, Halleck imposes exile on himself, constantly tortures himself with the shame of loving another man’s wife and eventually becomes a church minister. The idea of divorce is a last resort, an absolute last resort to many of the characters in the book. The fact that Marcia and Bartley are married gives their relationship an infinitely higher worth to conventional characters such as Halleck than any he could have with the beautiful woman. Yet the society in which they all live is rapidly moving more towards Bartley’s rather casual view of such matters rather than Halleck’s seriousness. The first time the word â€Å"divorce† is mentioned in the book occurs in the following manner: â€Å"It’s just so with the newspapers, too,† said Bartley. â€Å"Some newspapers used to stand out against publishing murders, and personal gossip and divorce trials, There ain’t a newspaper that pretends to keep anyways up with the times, now, that don’t do it! The public want spice, and they will have it!† (Howells, 2006) While Bartley is the putative â€Å"evil character† in the novel, he is, at least to the modern reader, one of more engaging and charming characters in a book that often seems to rely upon stereotypes. Perhaps Bartley is the most attractive because he is the most modern. Yet Howell’s himself is clearly condemning this casual attitude towards divorce as just another feature in a kaleidoscope of salacious entertainment for the public. Bartley makes what might be seen as a reasonable argument regarding his application for divorce to Halleck, saying â€Å"that was the only way out, for either of us . . . we had tried it for three years, and we couldn’t make it go; we never could have made it go; we were incompatible.† (Howells, 2006). Such a statement could have come straight from a simple, non-contested divorce case in 2007 in which two people find that they are not compatible even though they thought that they were. But again, because it sounds reasonable to modern ears, this does not mean to say that Howell’s is condoning the point of view. Indeed, the fact that he puts such opinions into the mouth of the character who cheats, lies and abandons people throughout the book:- albeit in an affable, likeable way – suggests that Howells is condemning this view of divorce as a merely practical virtue when a marriage has obviously failed. Yet Howells is not blind to the realities of the world. In one of the more memorable conversations of the book, the nature of love, marriage and the lack of love are discussed by two characters: Halleck turned. â€Å"What could be a worse hell than marriage without love?† he demanded , fiercely. â€Å"Love without marriage,† said Atherton. (Howells, 2006) While this may become somewhat reminiscent of the old Frank Sinatra song â€Å"Love and Marriage†, the paradox explicated by Atherton and Halleck is at the heart of the novel. A loveless marriage is indeed hell, as Halleck suggests. But within the moral code of the time so is love without marriage. This is a hell because it cannot be fully realized within a lasting relationship or consummated if the couple are to maintain a semblance of morality. The actual divorce case with which the novel ends is rendered in a manner that makes the proceedings tragi-comic in nature. Thus when Bartley appears to have won the day through Marcia not coming to the Court it seem as if his thoroughly amoral perspective on matters has finally vanquished the morality of the past. But eh subsequent arrival of Marcia and her father, together with the cross-complaint for divorce, renders the whole rather farcical in nature. At this lat moment divorce seems to be neither championed or disdained, rather it is a rather neat plot trick to bring matters to a sensible and neat conclusion. Howells mixtures melodrama, as Marcia â€Å"started half-way from her chair, and then fell back again . . . she looked round at Halleck as if for help, and hid her face in her hands† (Howells, 2006) with the â€Å"bad† man Bartley going into exile because of fallout from his failed lawsuit. The final statement of the book is rather ambiguous. Apparently the fact that Halleck had loved Marcia while her husband was alive makes him ineligible, in a moral sense, to ask her to marry him now that she is a widower. The novels ends ambiguously, as if pointing the way to the relativistic morality of the Twentieth Century that Howells seems to sense is coming, and which he fiercely resists: Of course it isn’t a question of gross black and white, mere right and wrong; there are degrees, there are shades. There might be redemption for another type of man in such a marriage; but for Halleck there could only be loss, — deterioration – lapse from the Ideal. . . . (Howells, 2006) To conclude, it seems clear from this that the absolute morality of the Nineteenth Century, something which Halleck takes to almost absurd lengths, would not forgive him his love for another man’s wife even though it was a loveless marriage that has been ended through death. Howells believes that divorce may be a last resort needed in cases of great cruelty and/or abandonment, but he also sees it as repugnant. Marriage is sacred, even one as loveless and broken as that portrayed in this novel. Works Cited Howells, William. A Modern Instance. Hard Press, New York: 2006.

The Ugly Secret of The Best Easy Argumentative Essay Topics

The Ugly Secret of The Best Easy Argumentative Essay Topics the Best Easy Argumentative Essay Topics Explained Students lead busy lives and frequently forget about a coming deadline. They are a part of the educational system and they also play a role in politics so such issues touch almost all students in all countries. At various classes, they learn how to perform great articles. With proper main topics, they can reach good results. If you are searching for properly written and formatted paper you're at the most suitable location, trust college essay writers and you'll definitely get the best from them! Our professional writers understand the fundamental elements of an argumentative essay. When you inform us about all of the paper information, we'll begin searching for an ideal writer for your paper. Our crew of professional writers with the essential experience and writing skills is always prepared to fulfill your demands and exceed your expectations. There's, naturally, a limit on the variety of pages even our very best writers can produce with a pressing deadline, but generally, we figure out how to satisfy all the clients seeking urgent assistance. There are many steps that you should take so as to compose a fantastic essay. Some folks may believe that the excellent content could be written on any topic and the paper success is dependent just on the mastery of the writer. You may observe that the method is virtually always the exact same. The Awful Secret of the Best Easy Argumentative Essay Topics If it's necessary to compose your whole essay in 1 day, do your very best to give yourself breaks so you don't burn out. Life is far better than it was 50 decades ago. Excellent news is that we've got a solution. Droz If the money doesn't serve you, it is going to rule over you. You may use many examples which can be found on the net free of charge. It is not hard to view and find several ideas online. It is not difficult to discover numerous excellent ideas online. Therefore, you can ask all the essential questions and consult on some points. It's important to select debatable argumentative essay topics as you need opposing points you could counter to your own points. When you are finished with your essay, you must not simply check it for spelling and grammatical errors, but nevertheless, it also has to be checked for logical fallacies. In this kind of situation, it's more convenient to discover ready-made essays and use them as an example. The very first problems appear when students attempt to discover easy argumentative essay topics and realize there are only a few topics which are both interesting and original. To compose a strong argumentative essay, students should start by familiarizing themselves with a number of the common, and frequently conflicting, positions on the research topic so they can write an educated paper. Another reason is to observe how well students argue on various views and demonstrate understanding of the studied subject. To write a terrific argumentative essay the students first must investigate several sides of the argument, allowing them to make an educated stance. You don't need to find super technical with legal argumentative essays, but remember to do your homework on what the present laws about your preferred topic actually say. Facts, in the long run, will always win out against how folks are feeling at a specific moment. In choosing your topic, it's frequently a good notion to start with a subject which you already have some familiarity with. You will have plenty of research to do, and that means you'll comprehend the religion you make an attempt to criticize or justify. Examine the list to choose the topic which can help you compose a creative essay for your middle school class. You will be assigned a topic, or your professor will enable you to select your own. The student should investigate a topic, evaluate evidence, collect, generate, and set a standpoint on the subject in a powerful and concise method. He has to investigate the topic thoroughly so that he or she can collect evidence.

A Comparison of Two Newspapers - 758 Words

A Comparison of Two Newspapers The Sun and the Guardian are very different newspapers, even at a first glance you can see that they are created for different purposes. The guardian newspaper is twice the size of a tabloid newspaper e.g. The Sun. and therefore has twice as much information, than a tabloid. A Tabloid newspaper focuses on the images, and has less information than a broadsheet newspaper, so it can attract a different audience. The Sun and the News of the World are clearly tabloid newspapers because they are small, most tabloid newspapers have redtop mastheads, to draw the eye of the†¦show more content†¦Tabloids use photographs and images on the front page. To draw the readers attention to the article. The images are also relevant to the main story in the paper, so that the reader can just look at the picture and see what the story’s about. The pictures are also used to show the reader that they have sources that are reliable enough to to get correct photographs of the scene, for example the main story on the sun is that Malcolm Glazer is buying Manchester United, and the fans protesting, so for the picture they have got a picture of the fans holding a banner saying â€Å"not for sale†. Broadsheet newspapers do not need as many photographs as they rely on the information in the copy rather than the imagery, broadsheet newspapers have about 2-3 images on a front page, as the copy is more important because that is how they get Broadsheet newspapers do not need as many photographs, as they rely on the information in the copy rather than the imagery. Broadsheet newspapers have about 2-3 images on the front page, as the copy is more important to a broadsheet newspaper. 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