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Wellhead descending tool

A wellhead head and tool technology, applied in wellbore/well parts, earthwork drilling and production, etc., can solve problems such as collision and friction, low reliability, and many parts, achieve quick installation and release, save installation time, and improve efficiency Effect

Inactive Publication Date: 2013-12-18
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing tools for lowering the wellhead head for offshore oil and gas production have the following shortcomings: 1. The tool structure is complex, there are many parts, and the loading and unloading process is complicated and time-consuming; 2. The reliability is low, and the wellhead head cannot be locked or released as required; 3. The process of lowering the wellhead head There is bump and friction

Method used

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Examples

Experimental program
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Embodiment Construction

[0016] The present invention will be further described below in conjunction with the embodiments and the accompanying drawings.

[0017] refer to figure 2 , The wellhead head lowering tool of the present invention includes a mandrel 1, a long bolt 2, a short bolt 3, a protective cover 4, an upper support block 5, a drive block 6, an open elastic locking ring 7 and a lower support block 8.

[0018] The well head lowering tool mandrel 1 is a stepped shaft, and there are threads at the middle step shaft to be connected with the driving block. The two ends of the stepped shaft where the threads are located naturally form baffles to locate the positions of the upper support block 5 and the lower support block 8 . There are tapered threads in the holes at the upper and lower ends of the mandrel 1, the upper thread is used for connecting drill pipes or other casings, and the lower thread is used for connecting other flushing tools. The drive block 6 is screwed onto the spindle 1 ....

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Abstract

The invention relates to an underwater wellhead descending tool used for offshore oil and gas production. The underwater wellhead descending tool comprises a spindle, an upper support block, a lower support block, a driving block, a locking ring and a protective cover. The upper support block and the lower support block are connected and sleeved on the spindle by bolts, the spindle is connected with the driving block in a threaded manner, axial through holes with guide effects are formed in the driving block, the corresponding bolts penetrate the axial through holes of the driving block, the opening elastic locking ring is mounted between the driving block and the lower support block, and the protective cover is positioned on the top of the underwater wellhead descending tool and is connected onto the upper support block by bolts. The underwater wellhead descending tool has the advantages that a wellhead can be effectively descended and recycled by the aid of the underwater wellhead descending tool, the underwater wellhead descending tool is simple in structure, working procedures are simple and convenient, the wellhead can be quickly mounted and recycled, and the work efficiency can be improved.

Description

technical field [0001] The invention relates to an underwater wellhead lowering tool for marine oil and gas exploitation, which is used for lowering and installing the underwater wellhead. Background technique [0002] Since offshore oil and gas exploitation has become an important development direction of energy development, the lower part of the subsea wellhead system supports various casings on the seabed, and the upper part carries blowout preventers and Christmas trees, which is the basis for underwater oil production. Most of the investment in offshore oil and gas exploration is used for the installation of subsea equipment. Therefore, simple and convenient lowering tools and simple installation procedures to reduce installation costs are the goals that offshore oil and gas exploration has been pursuing. The existing tools for lowering the wellhead head for offshore oil and gas production have the following shortcomings: 1. The tool structure is complex, there are many...

Claims

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Application Information

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IPC IPC(8): E21B23/00
Inventor 肖文生侯超秦浩智
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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