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Novel multi-wellhead anti-soil-plug suction anchor and mounting method thereof

A suction anchor, a new type of technology, is applied in the direction of earthwork drilling, wellbore/well components, sealing/isolation, etc. It can solve problems such as suction anchoring soil plugs, etc., achieve safe and efficient drilling operations, improve pullout resistance, Avoid rotation and vertical translation effects

Active Publication Date: 2021-06-11
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This device improves wellhead stability but does not solve the problem of soil plugs in suction anchor installations

Method used

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  • Novel multi-wellhead anti-soil-plug suction anchor and mounting method thereof
  • Novel multi-wellhead anti-soil-plug suction anchor and mounting method thereof
  • Novel multi-wellhead anti-soil-plug suction anchor and mounting method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Such as Figure 1-7 As shown, this embodiment provides a novel multi-wellhead anti-soil plugging suction anchor, including an outer cylinder 1 and a sealing plate 3, wherein the outer cylinder 1 is a hollow cylinder with one end open, and the closed end of the outer cylinder 1 is uniformly provided with a wellhead 2, A shaft is arranged inside the well head 2 , and the open end of the outer cylinder 1 is movably connected to a circular sealing plate 3 , and the shaft seal runs through the sealing plate 3 .

[0040] The lower side of the sealing plate 3 is fixedly connected to the rib plate 4, and the rib plate 4 is evenly and movablely provided with a skirt 8.

[0041] A sliding connecting ring 5 is set on the sealing plate 3 , and the sealing plate 3 is slidably connected with the outer cylinder 1 through the sliding connecting ring 5 . The way in which the sealing plate is slidably connected to the outer cylinder through the sliding connection ring is the same as the...

Embodiment 2

[0055] A new type of multi-wellhead anti-soil plug suction anchor, the structure is as described in Example 1, the difference is that the ribs 4 are fan-shaped to avoid affecting the installation of the wellbore.

[0056] The skirt 8 is a rectangular plate, and the lower side of the skirt is movably connected to the rib plate. After the suction anchor sinks to a set depth by itself, it is pulled up for a certain distance, and the skirt expands to increase the friction between the rib plate and the seabed soil. Larger, thereby increasing the friction and torsion resistance between the suction anchor and the seabed soil, and enhancing the vertical bearing capacity and torsion resistance of the suction anchor.

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Abstract

The invention relates to a novel multi-wellhead anti-soil-plug suction anchor and a mounting method thereof, and belongs to the technical field of deepwater drilling and ocean engineering. The suction anchor comprises an outer cylinder and a sealing plate, wherein the outer cylinder is a hollow cylinder with one open end, well mouths are evenly arranged at the closed end of the outer cylinder, wellbores are arranged in the well mouths, the open end of the outer cylinder is movably connected with the circular sealing plate, and the wellbores penetrate through the sealing plate in a sealing mode. By arranging the sealing plate, the situation that sinking of the suction anchor is affected by soil plug in the mounting process is avoided, the stability of the suction anchor is improved, meanwhile, the pulling resistance, torsion resistance and vertical bearing capacity of the suction anchor are improved, and rotation and vertical translation are avoided.

Description

technical field [0001] The invention relates to a novel multi-wellhead anti-soil plugging suction anchor and an installation method thereof, belonging to the technical fields of deep water drilling and marine engineering. Background technique [0002] The suction anchor is generally a cylindrical structure with a closed upper end and an open lower end. There is a drain on the top plate to connect with the pumping equipment. The water pump draws water to form a pressure difference inside and outside the anchor body, and the anchor body continues to sink under the action of the pressure difference inside and outside until it sinks to the specified depth. [0003] In deepwater drilling and production operations, the stability of the wellhead is directly related to the efficiency and quality of the operation. For deepwater and shallow drilling operations, multi-wellhead suction anchors are usually used to enhance the stability of the wellhead. The multi-wellhead suction anchors ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B23/01E21B33/035
CPCE21B23/01E21B33/035
Inventor 赵丹石孙宝江章振杰
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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