Oil-gas well casing pipe liquid resin leaking stoppage squeezing tool and construction technology

A liquid resin, oil and gas well technology, applied in wellbore/well components, earthwork drilling, sealing/packing, etc., can solve the long-term rubber plug drilling and grinding time-consuming and laborious, the liquid plugging agent is expensive, and the pipe string is tripped. The problem of many times, etc., achieves the effect of simple and easy construction process, reducing the cost and labor intensity of tripping and drilling, and reducing the cost of tripping and drilling.

Active Publication Date: 2020-08-04
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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  • Oil-gas well casing pipe liquid resin leaking stoppage squeezing tool and construction technology
  • Oil-gas well casing pipe liquid resin leaking stoppage squeezing tool and construction technology
  • Oil-gas well casing pipe liquid resin leaking stoppage 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, with an initial daily liquid production of 4.86m3, daily oil production of 3.15t, water content of 22.8%, dynamic liquid level of 1309m, and salt content of 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] Huan* Well was put into production on March 6, 2012, with an initial daily oil production of 2.86t, water cut of 25.3%, dynamic liquid level of 1433m, and 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 coating o...

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PUM

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Abstract

The invention discloses an oil-gas well casing pipe liquid resin leaking stoppage squeezing tool and a construction technology. The squeezing tool comprises a bridge plug, a seat seal tool, a slide sleeve, a first oil pipe, a safety joint and a second oil pipe from bottom to top in sequence; the upper portion of the second oil pipe is connected to the mouth of a well; and the seat seal tool, the slide sleeve and the first oil pipe are all externally covered with polymer films. By optimizing a tool pipe column, the strength of a liquid plugging agent is different with different materials, thus,compared with a conventional technology, the squeezing technology can save construction time, relieve construction labor intensity, reduce the use amount of the plugging agent for construction and reduce the oil-gas well casing pipe leaking stoppage cost, and accordingly, the production well casing pipe liquid resin leaking stoppage technology has the good application prospects.

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 Applications(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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