An oil and gas well casing liquid resin plugging and squeezing tool and construction technology

A technology of liquid resin and construction technology, which is used in wellbore/well components, sealing/isolation, earth-moving drilling, etc. It can solve the problems of many times of tripping the pipe string, wasting materials, and retaining plugging agents, and reducing the The effect of tripping risk, reducing tripping cost and saving material cost

Active Publication Date: 2022-07-05
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are mainly the following problems in this process that need to be improved: 1) The construction operation requires a large number of tripping strings, and the oil-water well is faced with complex downhole conditions.
2) A large amount of plugging agent remains in the wellbore
On the one hand, the current price of liquid plugging agents is generally more than 200,000 / m3, leaving plugs and wasting materials
On the other hand, the drilling and grinding of long rubber plugs is time-consuming and laborious, and it is not easy to drill and grind

Method used

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  • An oil and gas well casing liquid resin plugging and squeezing tool and construction technology
  • An oil and gas well casing liquid resin plugging and squeezing tool and construction technology
  • An oil and gas well casing liquid resin plugging and squeezing tool and construction technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Zhen* Well was put into production on October 4, 2010. The initial daily liquid production was 4.86m3, daily oil production was 3.15t, water content was 22.8%, dynamic liquid level was 1309m, and salt content was 71309mg / L; The liquid level is 259m, and the salt content is 23380mg / L. The analysis shows that the casing is damaged. Decided to do chemical plugging.

[0054] (1) Pull out the pipe string from the original well.

[0055] (2) Through the well.

[0056] Specifically: lower the Φ118mm×1.5m through well gauge, and lead to the bottom of the artificial well.

[0057] (3) Find leaks.

[0058] Specifically, the packer is used, and the whole well section is tested for leakage, and the location of the leakage point is determined to be 1608m.

[0059] (4) Tool lamination.

[0060] Specifically: use low-pressure polyethylene tape to wrap the tool string, with a thickness of 1.5mm, tighten the film tape, and the width of the blank holder is 12mm. Grow 20cm and stuff...

Embodiment 2

[0075] The Huan* Well was put into production on March 6, 2012, with an initial daily oil production of 2.86t, a water cut of 25.3%, a dynamic liquid level of 1433m, and a salt content of 72,415mg / L; The salt was 21089mg / L, and the analysis indicated that the casing was damaged. Decided to do chemical plugging.

[0076] (1) Pull out the pipe string from the original well.

[0077] (2) Through the well.

[0078] Specifically: lower the Φ118mm×1.5m through well gauge, and lead to the bottom of the artificial well.

[0079] (3) Find leaks.

[0080] Specifically, the packer is used, and the whole well section is tested for leakage, and the location of the leakage point is determined to be 1608m.

[0081] (4) Tool lamination.

[0082] Specifically: use low-pressure polyvinyl chloride tape to wrap the tool string, with a thickness of 1.2mm, tighten the film tape, and the width of the blank holder is 15mm. The tool string covers the tool surface from the seat sealing tool to the...

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PUM

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Abstract

The invention discloses an oil and gas well casing liquid resin plugging and squeezing tool and a construction process. The squeezing tool includes, from bottom to top, a bridge plug, a seat sealing tool, a sliding sleeve, a first oil pipe, a safety joint and a second oil pipe. Two oil pipes, the upper part of the second oil pipe is connected to the wellhead; the outer parts of the seat sealing tool, the sliding sleeve and the first oil pipe are all covered with a polymer film. By optimizing the tool string and utilizing the different bonding strengths between the liquid plugging agent and different materials, the present invention makes the extrusion process compared with conventional technology, saves construction time, reduces construction labor intensity, saves construction plugging agent consumption, and reduces oil and gas wells. The cost of casing plugging makes the production well casing liquid resin plugging technology have a good application prospect.

Description

technical field [0001] The invention relates to the field of petroleum exploitation, in particular to an oil and gas well casing liquid resin plugging and squeezing tool and a construction process. Background technique [0002] With the increase of the multi-layer oilfield's production life, coupled with the influence of geological conditions and engineering factors, casing damage and fluid leakage outside the casing often occur, which affects the stable production of the oilfield and the smooth implementation of the development plan, and even causes production stoppage, which seriously affects the The effective water injection of the reservoir and the improvement of the ultimate recovery factor. The casing deformation of oil and water wells is aggravated, which increases the cost of workover production operations. At present, the commonly used channel sealing and plugging technologies mainly use cement, resin, organic materials, etc. for chemical plugging. [0003] The co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/13
CPCE21B33/13
Inventor 郭钢周志平李琼玮杨立华戚建晶孙雨来卢文伟郭阳王小勇程碧海
Owner PETROCHINA CO LTD
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