💰 Analysis of Long Term Jack-Up Rig Foundation Performance | SpringerLink

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Stability is simply the ability of a rig to remain afloat. to determine the stresses induced when a jack-up leg touches bottom or those caused by.


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The premise of a jackup rig is that it is self-elevating; here, the legs are stationed Providing a very stable drilling environment, in comparison to other types of.


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Stability is simply the ability of a rig to remain afloat. to determine the stresses induced when a jack-up leg touches bottom or those caused by.


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Stability is simply the ability of a rig to remain afloat. to determine the stresses induced when a jack-up leg touches bottom or those caused by.


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Stability is simply the ability of a rig to remain afloat. to determine the stresses induced when a jack-up leg touches bottom or those caused by.


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ABSTRACT Sudden, additional leg penetrations (punch through) have occurred over the past several years in different parts of the world involving jack-up.


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Stability is simply the ability of a rig to remain afloat. to determine the stresses induced when a jack-up leg touches bottom or those caused by.


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The premise of a jackup rig is that it is self-elevating; here, the legs are stationed Providing a very stable drilling environment, in comparison to other types of.


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ABSTRACT Sudden, additional leg penetrations (punch through) have occurred over the past several years in different parts of the world involving jack-up.


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Jack-up rig is a type of a drilling rig used in offshore locations which is driven into the ocean floor to provide bottom support and rig stability.


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Disconnect anchors, commence tow, give U. If it is necessary to stray from the design criteria, a few dollars spent in engineering analysis shall serve to ease many minds and to reduce the risk potential. Move into anchor pattern, connect anchors, disconnect and release tugs not being used for resetting anchors. Check all motor and brake functions and wiring if they have not been satisfactorily operated within the past 24 hours. In the case of jack-ups, consideration must be given to the sea state because of the change in floating characteristics that takes place while moving the leg up or down. It is false and senseless to ignore this section because to do so can only endanger the rig and personnel. Pretension anchors and release to operating tensions for 1-hour static test, all activity ceased. On the other vessels ballasting can improve the stability. Anchor handling and the effect of unequal mooring arrangement should be considered. The effect of the vertical center of gravity on a damaged vessel is considerable. The following is a sample preparation list for floating, raising, lowering, and preloading a jack-up: Check operator's console, main switchboard, and accessory equipment for corrosion, loose wiring, damage, etc. Each rig is like a new car, and even though you know how to drive, each car has its own peculiarities—so also does each rig, even so-called "sister ships. For the drillsbip and the semisubmersible the sea state must also be considered, but for a different reason. Also included in the "Operating Book" should be the limits of service in both the operating and towing positions. The effect of the leg striking the ocean floor must also be considered. Provide overall report for Owner. If a search were made for the major contributing factor in accidents occurring during tow, it would be found that bad design and inexperience head the list. It must be stressed here that although the shipbuilder may have gone to great lengths to determine the lightship upon completion, it is up to the owner or operator to make sure that the values are adjusted if any changes are made to the rig, i. What you need to know about… Project Management Made Easy! Check all electrical circuits for faulty insulation, breaks, and grounds. Develop deballasting schedule. Finalize ballast schedule to drilling draft, recalculate stability, Man pump rooms. Give insurance company and their representatives the following: a Distance of move, miles b Area and water depth of next location c Number, size and ownership of tugs to be used d Name of person in charge of move C. Damaged Stability Calculations should be prepared for the effect of damage to the outside compartments or flooding into any compartment. These calculations should show that the vessel has sufficient reserve stability to survive either damage or flooding. No matter what the size of your project, you need to have some sort of project management. The designer can only learn from feedback, but fortunately, technology is advancing rapidly in the marine field and information is more readily available today. Problems do, of course, occur without damage. Therefore, it is essential that the rig mover be completely familiar with the rig and the expected area environment during the move. A sudden squall, a change of sea state, or a wind coming out of nowhere can cause many things to happen. During all operations, the platform should be kept trim, Make level or equal-draft reading when approaching or leaving drilling location and check for an equal loading on each spud can when elevated and when elevating or lowering the platform.{/INSERTKEYS}{/PARAGRAPH} However, this is a condition that can occur suddenly, and it is not always possible to carry out a damaged stability calculation when the water is entering your cabin. Probably the most significant hazard occurs when the rig is preparing to "go on" or "come off" location. The above list is an attempt to cover a general area of moving checks. This can easily be done on a jack-up by lowering the legs. Once again, each vessel has its own peculiarities, and consultation with the designer combined with the experience of the rig mover can usually serve to eliminate serious conditions. {PARAGRAPH}{INSERTKEYS}Netwas Group Oil. Check and record all elevating motor torques, After checking all brakes, motors and torque readings, reinspect each motor to assure that all of the brake plugs have been reassembled and are tight. Post a comment Name Comment it up The prime consideration in preparing to move and while moving must be safety. The hazards that might be expected during a tow are too numerous to list, but I shall cover a few. Again let me stress to the rig mover: understand your rig, talk with the Naval Architect, and read the "Operating Book. He should have a basic knowledge of Naval Architecture and know how to apply it to his vessel. And if it takes place, it will be of such low impact velocity as to cause only a slow leak rather than a rapid flood. From this information, the operator determines the condition of the rig at any time. Project management consists of more than just a large building project and can encompass small projects as well. It is the responsibility of the rig mover to ensure a safe operation and to check the list given in the "Operating Book. The designer knows this, and should have oompartmented the rig such that flooding shall be contained within an allowable extent, which may be uncomfortable to those on board, but shall not result in a loss of the rig. Ruggero How do offshore rigs balance the torque generated from drilling? For every rig, the designer or builder should furnish the rig owner with a Stability Booklet which, at a very minimum, should contain a Hydrostatic Properties , b Cross Curves of Stability , [c Statical Stability Curves , and d Dynamic Stability Curves , Items c and d should be sufficient to cover the normal operating range of the vessel. This should have been taken care of by the designer, and the "Operating Book" should have a section related solely to allowable conditions for going on and coming off loction. Fortunately, we have more accurate weather forecasting today, and the rig mover sometimes can prepare for the change. The Lightship Characteristics are the foundation of all. On most drilling rigs presently in service, excluding drillships and self-propelled units, the probability of damage due to collision is remote. Here again we see the need for preplanning, and this should be discussed between the Owner and the Naval Architect,. Preparation for moving a semisubmersible rig or drillship is covered by the "Operating Book," but basically it would be as follows:. Ballast to drilling draft close all valves, take soundings of all tanks. Release remainder of tugs. If damage should occur, steps should be taken to lower the vertical center of gravity. Complete stability calculations at drilling draft. Other information that many would find useful and could be included in the Stability Booklet, but which is not considered to be essential, includes e Allowable Dynamic Stability KG Curves, f Damaged Stability Calculations, g Motion Response Analysis, and h Lightship Characteristics ,. Moving comes under two basic categories; a Field Transit and b Ocean Tow. Complete stability calculations for upcoming move. Stability is simply the ability of a rig to remain afloat. Secure pump rooms. Safety can only mean more operating time and more return on dollar investment. Even the mightiest rig can act like a cork in the ocean on such occasions. Education can only improve safety. Get My Free Ebook. One of the greatest fears that develops while at sea is that of damage which may produce flooding and, if extensive enough, the loss of the rig. These curves are a growth of the dynamic stability curves , and they simplify the rig mover's job by eliminating the need to prepare a calculation of dynamic stability every time he decides on a possible tow condition. Preparation for moving a semisubmersible rig or drillship is covered by the "Operating Book," but basically it would be as follows: Give notices to parties concerned. Tie down all cargo. How you manage your project has everything to do with its outcome. I feel that a discussion between these people would not only increase the education of both, but would also help ensure a safer operation and, I would hope, eliminate disasters due to incompetence. Several courses of action are available: a jack-up can lower the legs, a semisubmersible can ballast, and a drillship or self-propelled vessel can alter course to avoid, or at least reduce, the effect of the squall or other problems. Authorize drilling operations to commence. It has not been the practice in the past for the rig mover to discuss the rig with the designer, or builder's naval architect, prior to delivery of the rig. Connect tugs. The subject of stability is further divided under the two headings of a Intact Stability and b Damaged Stability. Put all generators on line to check paralleling characteristics and overall engine-generator operations. Responses Aston What calculations do you use when ocean drilling? Replace motor covers. A Field Transit condition is generally considered to be a move that would require no more than a hour voyage to a location where the unit could be jacked up, or to a protected location. Provide for towing company the following: a Distance of move, with initial and final positions b Number, horsepower, and type of tugs c Required towing equipment dj Radiofrequency for communications e Name of person in charge of move f Request for tugs to contact rig, giving estimated time of arrival, names of captains and tugs, and which tug is lead Obtain long-range weather forecast. If the ABS "Rules for Building and Classing Offshore Mobile Drilling Units " are applied to the vessel, the ability to survive damage or flooding must be considered in association with the overturning effect of a knot wind. A mooring arrangement and procedure should be included in the "Operating Book,". Dispatch tugs and anchor-handling crew. In conclusion, I would again stress the importance of discussions between the designer and operator on the peculiarities of each rig. It should be remembered that the offshore drilling rigs are still new in comparison to ships. An Ocean Tow should be considered for all other moves. It is easy to say that with a little common sense most damages and flooding can be avoided, but they still occur. Check all other electrical and mechanical components. Every rig owner should receive from the builder a book entitled "Operating Book" or "Booklet of Operating Conditions. Retake soundings of all tanks to make sure there are no leaks. Man pump rooms, Deballast, as scheduled, to desired draft and recheck calculations. Moving is the intentional relocation of the rig for any purpose, though we think of changing drilling location when we talk of o m i o. Finalize move schedule.