Offshore casing surge compensation dual-drive three-layer casing drilling and coring method

A dual-drive, casing technology, applied in the direction of casing, drill pipe, drill pipe, etc., can solve the problems of unsafe and applicable drilling and coring methods for difficult coring formations, immature and other problems, and achieve stable and reliable drilling, device Simple, reliable, and highly operable effects

Active Publication Date: 2022-01-11
GUANGZHOU MARINE GEOLOGICAL SURVEY
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  • Claims
  • Application Information

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Problems solved by technology

At present, the domestic core drilling technology for land is relatively mature, but for water drilling, especially ocean core drilling technology is still immature, and there is no safe and suitable drilling and coring method suitable for difficult-to-coring formations.

Method used

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  • Offshore casing surge compensation dual-drive three-layer casing drilling and coring method
  • Offshore casing surge compensation dual-drive three-layer casing drilling and coring method
  • Offshore casing surge compensation dual-drive three-layer casing drilling and coring method

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Embodiment

[0045] An offshore casing surge compensation dual-drive three-layer casing drilling and coring method in this embodiment includes two parts:

[0046] (1) Provide a figure 1 The offshore casing surge compensation dual-drive three-layer casing drilling coring device shown mainly includes the drilling ship 7 and the drilling tool system installed on the drilling ship 7, the outer casing drilling system, the inner casing and the drill pipe drill. Inlet system and mud circulation system.

[0047] The drilling ship 7 includes a dynamic positioning system, and when the dynamic positioning is turned on, the wellhead position can be positioned at the specified coordinates. The deck of the drilling ship 7 is provided with a moon pool 10 and a tower (not shown in the figure), the top of the moon pool 10 is provided with a moon pool cover 8, and the center of the moon pool cover 8 is provided with a pneumatic slip 9. A liftable subsea base plate 12 is suspended.

[0048] The pneumatic ...

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Abstract

The invention discloses an offshore casing surge compensation dual-drive three-layer casing drilling and coring method. The method comprises the following steps that a drilling ship is positioned at set longitude and latitude coordinates through a dynamic positioning system, a drilling rod is stabilized through a seabed base plate, torque and drilling pressure are transmitted through wellhead casing surge compensation, and during casing drilling, water depth changes caused by rising tide, falling tide or surges can be compensated within a certain range through surge compensation, a sleeve is prevented from colliding with equipment, wellhead operation safety is guaranteed, three-layer sleeve drilling is achieved through double driving heads, the well wall is effectively protected, the drilling sampling coring rate is high, and the coring quality is good. Compared with a common drilling method, the method has the advantages of high drilling efficiency, high coring rate, simple equipment, high reliability, low cost and the like, and is not only suitable for shallow drilling of common sedimentary rock stratums, but also suitable for stratums difficult to core, such as reef limestone stratums and sandy soil stratums.

Description

technical field [0001] The invention relates to the technical field of marine drilling, in particular to a marine shallow drilling coring method with dynamic positioning of a ship, double drilling drive heads, wellhead surge compensation with an outer casing, and heave compensation for casing drilling. Background technique [0002] Offshore core drilling is different from land drilling, with strong winds and waves, complex sea bottom, and difficult core drilling. Casing wall protection is usually required. At present, domestic core drilling technology for land is relatively mature, but for water drilling, especially ocean core drilling technology is still immature, and there is no safe and suitable drilling and coring method suitable for difficult-to-coring formations. Contents of the invention [0003] The object of the present invention is to overcome the deficiencies of the prior art, and provide a drilling and coring method for offshore casing surge compensation with d...

Claims

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Application Information

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IPC IPC(8): E21B25/18E21B17/00E21B21/00E21B41/00
CPCE21B25/18E21B21/001E21B41/0007E21B17/00E21B19/143E21B7/12E21B15/02E21B19/002E21B19/16E21B21/063
Inventor 田烈余郭武杨楠李占钊
Owner GUANGZHOU MARINE GEOLOGICAL SURVEY
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