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Lifting pressurized well-repairing technology in closed oil pipe

A kind of oil pipe and workover technology, which is applied in the direction of drilling pipe, casing, drilling equipment, etc.

Inactive Publication Date: 2014-08-20
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD CHANGQING DOWNHOLE TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is a good solution to the safe tripping operation of unblocked pipe strings in wells with pressure operation in oil and gas wells

Method used

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  • Lifting pressurized well-repairing technology in closed oil pipe
  • Lifting pressurized well-repairing technology in closed oil pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment １

[0024] The lifting and pressure workover process in the closed tubing is characterized in that it at least includes the following steps:

[0025] Step 1. Equipment installation, namely: the installation of the lifting and pressure workover device in the sealed tubing;

[0026] Step 2. Under pressure salvage tubing hanger;

[0027] Step 3, lifting the pipe string in the well under pressure;

[0028] Step 4. Righting the shackle with pressure;

[0029] Step 5. Lifting upright with small distance under pressure;

[0030] Step 6. Divide the high-pressure and low-pressure chambers;

[0031] Step 7. Lift the tubing under normal pressure.

Embodiment ２

[0033] as attached figure 1 As shown, when carrying out oil and gas well pressure operation, by adopting this process, the unblocked oil pipe under pressure in the oil and gas well can be actively lifted and pressed down in the high-pressure chamber of the device, and the oil pipe can be adjusted in the high-pressure chamber according to the operation needs. And the tools in the well are straightened and the operation is to make up and break out, realize the separation of high and low pressure in the device cavity, and enable the wellhead operators to realize normal pressure tripping operations.

[0034] The steps are explained in detail as follows:

[0035] Step 1. Equipment installation, namely: the installation of the lifting and pressure workover device in the sealed tubing;

[0036] 1) Check and pressure test the installed lifting and workover device in the sealed tubing;

[0037] 2) Use the temporary plugging tool in the wellhead oil pipe to temporarily block the oil p...

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Abstract

The present invention relates to a workover process for lifting under pressure in a closed oil pipe, which at least includes the following steps: 1) equipment installation, that is: installation of a workover device for lifting under pressure in the closed oil pipe; 2) salvage oil pipe under pressure Hanger; 3), Lifting the pipe string in the well under pressure; 4), Uprighting shackle under pressure; 5), Uprighting and lifting with small distance under pressure; 6), Splitting high-pressure and low-pressure chambers; . This process can actively lift and depress the unblocked tubing under pressure in the oil and gas well in the high-pressure chamber of the device. According to the operation requirements, the tubing and in-hole tools can be straightened and screwed up and unclamped in the high-pressure chamber to realize the in-cavity operation of the device. The separation of high and low pressure enables wellhead operators to realize normal pressure tripping operations. It is a good solution to the safe tripping operation of unblocked pipe strings in wells with pressure operation in oil and gas wells.

Description

technical field [0001] The invention relates to a workover technique for oil and gas wells under pressure, in particular to a workover technique for lifting under pressure in a closed oil pipe. The utility model belongs to the technical field of oil and gas field mining machinery. Background technique [0002] In recent years, with the intensification of oil and gas field development, the snubbing operation of oil and gas wells accounts for an increasing proportion of downhole operations, while the development of corresponding snubbing operation equipment and tools is relatively lagging behind, and the existing snubbing operation equipment cannot realize unblocked If the pipe string in the well is lifted and lowered under pressure in a closed well, there is a large risk in the operation process, and the intrinsic safety of the operation under pressure cannot be truly realized. [0003] At present, the snubbing equipment used in oil and gas fields must block the tubing in th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/03E21B19/00
Inventor 徐迎新孙虎周丰刘国良张冕韩文哲牛俊峰邓继学魏建荣
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD CHANGQING DOWNHOLE TECH CO
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