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An offshore casing surge compensation double-drive three-layer casing drilling coring method

A dual-drive and casing technology, applied in the direction of casing, drill pipe, drill pipe, etc., can solve the problems of immature, unsafe and applicable drilling and coring methods for difficult coring formations, etc. Stable and reliable, the effect of preventing drilling accidents

Active Publication Date: 2022-07-26
GUANGZHOU MARINE GEOLOGICAL SURVEY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • An offshore casing surge compensation double-drive three-layer casing drilling coring method
  • An offshore casing surge compensation double-drive three-layer casing drilling coring method
  • An offshore casing surge compensation double-drive three-layer casing drilling coring method

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Embodiment

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

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

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

[0048] The pneumatic slip 9 is a ...

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Abstract

The invention discloses an offshore casing surge compensation double-drive three-layer casing drilling coring method. The drilling vessel is positioned at the set latitude and longitude coordinates through a dynamic positioning system, the drill pipe is stabilized through the seabed base, and the wellhead casing is used to stabilize the drill pipe. Pipe surge compensation can transmit torque and WOB during casing drilling. During sampling drilling, surge compensation can compensate for water depth changes caused by rising tide, ebb tide or surge within a certain range, preventing casing from colliding with equipment and ensuring that The wellhead operation is safe, and three-layer casing drilling is realized by double driving heads, which effectively protects the well wall, so that the drilling sampling coring rate is high, and the coring quality is good. Compared with the common drilling method, the invention has the advantages of high drilling efficiency, high coring rate, simple equipment, high reliability, low cost, etc., and is not only suitable for shallow drilling in general sedimentary rock formations, but also suitable for difficult-to-core formations, such as Reef limestone formation, sandy soil layer.

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 ships, dual drilling driving heads, and wellhead surge compensation with outer casing and casing drilling heave compensation. Background technique [0002] Offshore coring drilling is different from land drilling, with strong winds and waves, complex bottom layers of the seabed, and difficulty in coring, usually requiring casing wall protection. At present, the domestic coring drilling technology for land is relatively mature, but the coring drilling technology for water drilling, especially the ocean, is still immature, and there is no safe and applicable drilling coring method suitable for difficult-to-core formations. SUMMARY OF THE INVENTION [0003] The purpose of the present invention is to overcome the deficiencies of the prior art, and to provide an offshore casing surge compensation double-driv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B25/18E21B17/00E21B21/00E21B41/00
CPCE21B25/18E21B21/001E21B41/0007E21B17/00E21B19/002E21B7/128E21B7/20E21B7/12E21B15/02E21B19/16E21B21/063
Inventor 田烈余郭武杨楠李占钊
Owner GUANGZHOU MARINE GEOLOGICAL SURVEY
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