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Safe offshore drilling rotary pressure-holding coring method

A rotary and safe technology, applied in the direction of extraction of undisturbed cores, earthwork drilling, etc., can solve the problems of the inner tube assembly of the corer, the poor reliability of the corer, the failure of the corer, etc. Simple and convenient operation, quick and convenient maintenance, and improved reliability

Active Publication Date: 2021-05-07
GUANGZHOU MARINE GEOLOGICAL SURVEY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once the pin is cut off by the impact, it is easy to cause the inner tube assembly of the coring device to be disengaged early, and then the ball valve will be closed in advance, resulting in coring failure. Therefore, the coring device using the shear pin has poor reliability and poor safety.

Method used

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  • Safe offshore drilling rotary pressure-holding coring method
  • Safe offshore drilling rotary pressure-holding coring method
  • Safe offshore drilling rotary pressure-holding coring method

Examples

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Embodiment Construction

[0064] Below, in conjunction with accompanying drawing and specific embodiment, the present invention is described further:

[0065] like Figure 1 to Figure 22 As shown, a safe offshore drilling rotary pressure-holding coring method includes the following steps:

[0066] 1) Connect the fishing spearhead 21 through an overshot (not shown in the figure), and drop the inner tube assembly 20 onto the seat ring 120 inside the outer tube assembly 10 at the bottom of the hole. Put into the release pipe, disconnect the connection between the overshot and the fishing spearhead 21 and recover the overshot to the drilling platform;

[0067]2) After the drill pipe is connected to the drilling rig, the drilling rig synchronously drills the inner pipe assembly 20 and the outer pipe assembly 10 to the bottom of the well formation through the drill pipe, and keeps the bullet a 221 of the bullet mechanism 22 and the bullet suspension mechanism 27. The bullet clips b 276 are all in an open s...

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Abstract

The invention relates to a safe rotary pressure-maintaining coring method for marine drilling, which comprises an outer pipe assembly and an inner pipe assembly installed inside the outer pipe assembly, and a drill bit is arranged at the bottom of the outer pipe assembly; the inner pipe assembly The assembly includes an inner tube assembly a and an inner tube assembly b. The inner tube assembly b is installed inside the inner tube assembly a and can move axially along the inner tube assembly a. The inner tube assembly a includes a The salvage spear head, the cartridge mechanism, the piston tube, the middle pipe nipple, the sealing nipple, the accumulator connecting pipe, the middle pipe and the pressure-holding ball valve flip sealing mechanism are connected sequentially from top to bottom; the inner pipe assembly b includes top to bottom The hoisting device, connecting mechanism, magazine suspension mechanism, single-action mechanism, conversion joint, adjustment joint, accumulator connecting pipe, sealing mechanism, temperature and pressure instrument connecting pipe, core pipe connecting nipple and core pipe are sequentially connected. The safe rotary pressure-holding sampling method of the invention can adapt to Quaternary sedimentary strata and bedrock, and is more reliable in application.

Description

technical field [0001] The invention relates to the technical field of drilling, in particular to a safe marine drilling rotary pressure-maintaining coring method for natural gas hydration. Background technique [0002] Natural gas hydrate is an efficient and clean energy with rich resources, and it is the strategic commanding height of future global energy development. Natural gas hydrate occurs under the seabed of the deep-sea continental slope or buried in sediments in polar regions. Since natural gas hydrate needs to be kept in a stable In order to maintain stability and not decompose under pressure, it is necessary to use a pressure-holding method for collection. The shearing pin is used to trigger the core pipe to be pulled out from the pressure-holding ball valve and then the ball valve is closed. Because the shearing pin works unstable, it is sheared due to bumping and impact during the process of putting in the corer. Once the pin is sheared by the impact, it is ea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B25/18E21B25/08
Inventor 叶建良邱海峻秦绪文谢文卫卢秋平张伟陆敬安于彦江陆红锋黄芳飞史浩贤李晶李博
Owner GUANGZHOU MARINE GEOLOGICAL SURVEY
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