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Mounting device and mounting method for deepwater surface layer guide pipe

A technology for installing devices and conduits, which is applied in earthwork drilling, wellbore/well components, etc., and can solve the problems of increasing operating costs, prolonging operating time, and loss of bearing capacity of deep-water surface conduits.

Pending Publication Date: 2021-07-30
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the installation process of the deep water injection method, due to the large disturbance of the seabed soil by the hydraulic injection, the bearing capacity of the deep water surface conduit will be greatly lost, resulting in a greater risk of subsidence or instability of the subsea wellhead
In order to increase the bearing capacity, it is usually necessary to increase the depth of the deep-water surface conduit or the standing time to reduce the operation risk, but this will prolong the operation time, increase the operation cost, and increase the operation cost

Method used

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  • Mounting device and mounting method for deepwater surface layer guide pipe
  • Mounting device and mounting method for deepwater surface layer guide pipe
  • Mounting device and mounting method for deepwater surface layer guide pipe

Examples

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Effect test

Embodiment 1

[0039] The invention provides a deep water surface conduit installation device, such as Figure 1-Figure 3 As shown, the installation device includes: a surface conduit 10, a propeller 40, a lowering mechanism 20 and a conduit base plate 30; the propeller 40 is installed on the surface conduit 10 for applying a downward thrust to the surface conduit 10; the lowering mechanism 20 is used for lowering the surface conduit 10 from the sea surface to the sea bottom;

[0040] The conduit base plate 30 is lowered to the seabed and fixed; the running mechanism 20 lowers the surface conduit 10 to the seabed, and the surface conduit 10 remains vertical under the uprighting of the conduit base plate 30; the propeller 40 is started, and the The surface conduit 10 exerts a downward thrust, and the surface conduit 10 is forced to move toward the seabed soil 70 , and the installation of the surface conduit 10 is completed. The installation device utilizes the boosting effect of the propelle...

Embodiment 2

[0056] The invention provides a method for installing a deep-water surface conduit, using the above-mentioned installation device for a deep-water surface conduit, such as Figure 5 As shown, the installation method includes: step S10, fixing the conduit base plate 30 to the seabed; step S20, lowering the surface conduit 10 to the seabed; step S30, starting the propeller 40, and the propeller 40 generates thrust to drive the surface conduit 10 Down into the subsea soil mass 70 .

[0057] The installation method has the following advantages: (1) convenient operation, shortened working time, and reduced operating costs; (2) helps to ensure the quality of the installation of the surface conduit 10 and reduce the risk of deep-water operations.

[0058] In step S10, the conduit template 30 is directly connected to the ship's crane, stern A-frame or winch through a wire rope, and is slowly hoisted to the seabed. The underwater conduit template 30 can be installed at a designated po...

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Abstract

The invention provides a mounting device and mounting method for a deepwater surface layer guide pipe. The mounting device for the deepwater surface layer guide pipe comprises a surface layer guide pipe body, a propeller, a tripping-in mechanism and a guide pipe base disc; the propeller is mounted on the surface layer guide pipe body and is used for applying downward thrust to the surface layer guide pipe body; the tripping-in mechanism is used for tripping the surface layer guide pipe body into the seabed from the sea surface; and the guide pipe base disc can be fixedly arranged on the seabed, and the guide pipe base disc is used for centralizing the surface layer guide pipe body. According to the mounting device and mounting method, the technical problems of long operation time and high operation cost when a surface layer guide pipe is mounted in a deepwater shallow stratum are solved.

Description

technical field [0001] The invention relates to the field of offshore oil and gas development, in particular to an installation device and an installation method for a deep-water surface conduit. Background technique [0002] In the exploration of offshore oil and gas resources, the surface conduit is the first layer of structural pipe to be lowered during the construction of deepwater oil and gas wells. It provides structural support for the underwater wellhead, underwater blowout preventer group, and Christmas tree. The surface conduit must be able to withstand Drilling equipment, casing suspension and various loads loaded on it during future production operations. [0003] The installation of surface conduits is an important part of deepwater drilling operations. At present, there are mainly hammering method, drilling method and spraying method for the surface conduit. For deep-water and shallow formations, due to poor diagenesis and low formation strength, the jetting ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B41/08E21B41/10
CPCE21B41/08E21B41/10
Inventor 杨进傅超严德贺馨悦宋宇殷启帅魏庆峰
Owner CHINA UNIV OF PETROLEUM (BEIJING)