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Casing hanger and seal lowering tool for ocean deepwater drilling

A technology for deepwater drilling and drilling water, which is used in sealing/isolation, earthwork drilling, wellbore/well components, etc., can solve the problem of no deepwater submerged wellhead lowering tools, etc., and achieves the effect of satisfying requirements and efficient control

Inactive Publication Date: 2013-01-16
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The subsea wellhead system is the foundation of deep sea drilling operations, and the lowering tool is an indispensable key drilling equipment in ocean drilling. As the core equipment, the lowering tool of the underwater wellhead system is basically kept confidential. At present, there is no independent domestic Developed deepwater subsea wellhead lowering tool

Method used

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  • Casing hanger and seal lowering tool for ocean deepwater drilling
  • Casing hanger and seal lowering tool for ocean deepwater drilling
  • Casing hanger and seal lowering tool for ocean deepwater drilling

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with the embodiments and the accompanying drawings.

[0018] refer to figure 1 and Figure 4 . The lower tool body is mainly composed of the lower tool body 2, the pin 4 and the locking block 3. The lower part of the lower tool body 2 protrudes radially outwards and carries a plurality of locking blocks 3. The flange at the lower end of the mandrel 9 pushes the locking blocks 3 and radially protrudes to cooperate with the groove 6 inside the casing hanger 7. The locking sleeve Tube hanging7. The pin 4 cooperates with the Z-shaped groove 5 on the outer diameter of the mandrel 9, and the mandrel 9 can reach three different positions relative to the lower tool body through the pin 4 and the Z-shaped groove 5. figure 1 It is the state when the mandrel 9 is at the uppermost end relative to the lower tool body, that is, the pin 4 is at the first position 24 of the Z-shaped groove.

[0019] refer to fi...

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Abstract

The invention discloses a casing hanger and seal lowering tool suitable for ocean deepwater drilling, which is used for lowering a casing hanger and a seal and mounting a sealing assembly in the ocean deepwater drilling process. The tool mainly comprises a central shaft, a lower tool and an upper tool, wherein the lower tool mainly comprises a lower tool body, a pin and a locking block; the upper tool mainly comprises an upper component, a lower component, a variable channel piston, a hydraulic auxiliary lowering piston, a pressing sleeve, a suspension sleeve and an outer sleeve; a Z-shaped groove on the lower part of the central shaft and the lower tool body can be matched with each other through the pin at three matching positions, and the central shaft is moved up and down to reach an initial sealing position firstly by changing the matching positions; and the pressing sleeve is connected with the hydraulic auxiliary lowering piston, moves downwards together with the hydraulic auxiliary lowering piston, and presses the locking sleeve of the sealing assembly downwards in the downward moving process to ensure that the inner locking ring of the sealing assembly is locked in the casing hanger, so that the sealing assembly can be mounted in a sealed mode.

Description

technical field [0001] The invention relates to the technical field of offshore oil deep water drilling. Specifically, it is an underwater wellhead casing hanging and sealing lowering tool suitable for marine deepwater drilling, which can lower the casing hanging and sealing, and complete the sealing of the sealing assembly in the casing hanging. Background technique [0002] At present, countries around the world have increasing demand for energy, and land oil and gas resources are increasingly depleted after large-scale development, which is far from meeting the country's demand for energy. Oil exploration and development is entering the ocean, especially the deep sea. The subsea wellhead system is the foundation of deep sea drilling operations, and the lowering tool is an indispensable key drilling equipment in ocean drilling. As the core equipment, the lowering tool of the underwater wellhead system is basically kept confidential. At present, there is no independent dome...

Claims

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Application Information

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IPC IPC(8): E21B33/043E21B23/00E21B23/10
Inventor 李旭冉肖文生杨祥祥
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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