Plugging material and plugging method for large leakage casing damage section of oil-water well

A plugging material and technology for oil-water wells, applied in sealing/isolation, chemical instruments and methods, earthwork drilling and production, etc., can solve the lack of effective measures for plugging of casing damage sections with large leakage and cannot meet the plugging operations of old wells, Insufficient pressure resistance and other problems, to achieve the effect of improving plugging efficiency, increasing temperature resistance, and high success rate
CN110396399AInactive Publication Date: 2019-11-01PETROCHINA CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
PETROCHINA CO LTD
Publication Date
2019-11-01
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a plugging material and plugging method for a large leakage casing damage section of an oil-water well. The plugging material comprises a gel system and a resin system, whereina volume ratio of the gel system to the resin system is (4-8):(1-2); and the plugging method comprises the following steps: a leakage pore size is estimated by a deformation formula of a Bernoulli equation to provide a size selection support for a solid phase of the plugging material, leakage reduction operation is performed for multiple times by a strength gel, after leakage is less than 500 L / min, final plugging is performed by using a high-strength modified resin system, and therefore the purpose that the large leakage casing damage section of the oil-water well is successfully plugged atone time is achieved.
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Description

technical field

[0001] The invention relates to the field of petroleum exploitation, in particular to a plugging material and a plugging method for casing damage sections with large leakage in oil-water wells. Background technique

[0002] With the increase of the production life of multi-layer oilfields, coupled with the influence of geological conditions and engineering factors, casing damage and leakage of fluid outside the casing often occur, affecting the stable production of the oilfield and the smooth implementation of the development plan, and even causing production shutdown, seriously affecting It improves the effective water injection and ultimate recovery of the reservoir. At present, the commonly used channeling and leakage sealing technology mainly uses cement, resin, organic materials, etc. for chemical sealing. However, there are no effective measures for plugging the casing damage section with a large leakage exceeding 500 L / min, and oil production can only...

Claims

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