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Design method for changing load of deep water semi-submersible drilling platform deck

A technology of drilling platform and design method, which is applied in water conservancy projects, underwater structures, artificial islands, etc., can solve problems such as large variable loads, affecting the development of deep-water oil and gas fields, and affecting the return on investment of new platforms, so as to optimize the overall layout, The effect of optimizing investment and return

Active Publication Date: 2009-02-18
CHINA NAT OFFSHORE OIL CORP +1
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This may cause the variable load on the deck of the drilling platform to be too large or too small: if it is too large, it will cause waste of resources; if it is too small, it will not be able to meet the special requirements of deep-water drilling operations and affect the development of deep-water oil and gas fields. return on investment

Method used

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  • Design method for changing load of deep water semi-submersible drilling platform deck
  • Design method for changing load of deep water semi-submersible drilling platform deck
  • Design method for changing load of deep water semi-submersible drilling platform deck

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Embodiment Construction

[0024] The present invention will be described in detail below in conjunction with the examples.

[0025] 1. Partial load analysis and calculation of variable load on deck of deepwater semi-submersible drilling platform

[0026] The deck variable load determined by the present invention includes drilling fluid, riser (including blowout preventer group, riser lower assembly, etc.), drill pipe, casing, tubing, cement, barite, soil powder and other partial loads. The design method of each sub-load is as follows:

[0027] 1) Drilling fluid load

[0028] Drilling fluid load includes two parts: daily drilling fluid consumption and spare drilling fluid consumption. The calculation formula of drilling fluid load is as follows:

[0029] L m =ρ(V a +V r ) (1)

[0030] In the formula, L m —Drilling fluid load, t; ρ—Drilling fluid density, g / cm 3 ;V a — Daily drilling fluid volume, m 3 ;V r — reserve drilling fluid volume, m 3 .

[0031] Daily drilling fluid volum...

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Abstract

The invention relates to a method for designing the variable load on the board of a deepwater semisubmersible drilling platform, including the following steps: firstly, according to the maximum operation depth of water and the maximum drilling depth of the deepwater semisubmersible drilling platform, analyzing and calculating the partial loads of drilling fluid load Lm, riser load Lr, drill pipe load Ldp, sleeve Lcs, oil pipe load Lt, cement load Lce, barite load Lba, dust load Lbe; summing up the analyzed and calculated partial loads, and with reference to certain factors, educing the design formula of variable load of the board of the deepwater semisubmersible drilling platform: VDL is more than or equal to C[L](Lm+ Lr+ Ldp+ Lcs+ Lt+ Lce+ Lba+ Lbe+Lo). The method can simply and accurately design the variable load on the board of the deepwater semisubmersible drilling platform, playing a guiding role for the design and construction of the deepwater semisubmersible drilling platform and optimizing the investment and benefits of a newly constructed deepwater semisubmersible drilling platform. The method is widely applicable to the design and construction of deepwater semisubmersible drilling platforms.

Description

technical field [0001] The invention relates to a design method for deck variable loads, in particular to a design method for deck variable loads of a deep-water semi-submersible drilling platform. Background technique [0002] At present, there are only two kinds of mobile deep-sea drilling devices, the drilling ship and the semi-submersible drilling platform, which can carry out drilling operations in the deep sea in the world. Semi-submersible drilling platforms are widely used in drilling and oil production operations in the development of offshore oil and gas resources due to their characteristics such as wide applicable water depth range, strong environmental adaptability, flexible positioning methods and suitable for all stages of oil and gas development. [0003] For deepwater drilling operations, with the increase of water depth and well depth, the operation area is getting farther and farther away from the land, and the deep sea conditions, weather and other condit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02B17/00
Inventor 刘科蒋世全付英军曾恒一谢彬姜伟
Owner CHINA NAT OFFSHORE OIL CORP
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