A preloading method for a cantilever beam jack-up drilling platform
A drilling platform and cantilever beam technology, which is applied in the design and operation of jack-up drilling platforms, can solve the problem of high requirements on the number and total volume of ballast water tanks, constraints on the main dimensions and overall layout of the platform, and long pre-ballast operation time. and other problems, to achieve the effect of spacious equipment space layout, improving operation efficiency, and reducing the time for filling and discharging
Inactive Publication Date: 2020-04-03
CNPC BOHAI EQUIP MFG +1
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Problems solved by technology
It overcomes that the pre-ballasting operation of the existing jack-up drilling platform is completely dependent on the water injection of the ballast water tank, and the number and total volume of the ballast water tank designed for the platform are high, which restricts the main scale and overall layout of the platform. The actual pre-ballasting Long working hours and low work efficiency
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[0013] Such as figure 1 Shown, a kind of cantilever beam type self-elevating drilling platform pre-ballasting method, the method steps are as follows:
[0014] 1. Determine the distance that the cantilever beam 2 and the drill floor 3 need to move during the preloading operation of each pile leg: calculate the respective weights and center of gravity positions of the cantilever beam 2 and the drill floor 3, and calculate the planned distance on the platform The initial ground pressure that each leg can achieve when the ballast water tank is pre-ballasted, the initial ground pressure of each leg is compared with the target preload load that each leg needs to achieve, and the cantilever beam 2 and the drill The position of platform 3 is moved to realize that the actual ground pressure during the preloading operation of each pile leg is equal to the target preloading load to be achieved, and it is calculated that the cantilever beam 2 and the drill floor 3 are respectively the d...
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The invention relates to the field of self-elevating drilling platform design and operation technology, in particular to a pre-ballasting method for a cantilever beam self-elevating drilling platform. The method comprises the steps that first, the movement distance of a cantilever beam and a drill floor during pre-ballasting operation on each pile leg is determined, wherein the weight and center-of-gravity position of the cantilever beam and the drill floor are obtained through calculation, initial ground pressure which can be reached by all the pile legs when a planned ballasting water tank on the platform is adopted to perform pre-ballasting operation is calculated, and the initial ground pressure of all the pile legs is compared with a target pre-ballasting load needing to be reached by all the pile legs. Through the method, the demand of the platform on the pre-ballasting water tank at a design stage is lowered, the size of the platform is reduced, the weight of the platform is lowered, equipment spatial arrangement is spacious, and during pre-ballasting actual operation, ballasting water injection and discharge time is shortened, and operation efficiency is improved.
Description
Technical field: [0001] The invention relates to the technical field of design and operation of a self-elevating drilling platform, in particular to a preloading method of a cantilever beam type self-elevating drilling platform. Background technique: [0002] Before the jack-up drilling platform operates at a certain well location, a preloading operation must be carried out. The purpose is to make the pile legs reach the ground pressure of the pile legs in advance under the worst environmental conditions that may be encountered in future operations, and compress the seabed soil. Reality. Usually, the pre-ballasting operation adopts the method of injecting water into the ballast water tank, increasing the weight of the platform so as to increase the ground pressure of the legs. Only ballast water tanks are used for pre-ballasting operations. On the one hand, the number and total volume of ballast water tanks designed for the platform are relatively high, which restricts the ...
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IPC IPC(8): G06F30/17G06F119/14
CPCG06F30/17G06F2119/06
Inventor 孙承猛林海花张晓宇樊岩松杨轶普赵云鹤姚湘琳周佳于明阳周立师
Owner CNPC BOHAI EQUIP MFG