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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

Inactive Publication Date: 2019-11-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are no effective measures for the plugging of casing damage section with large leakage exceeding 500L / min, and oil production can only be achieved through mechanical isolation, which brings great inconvenience to the later measures
[0003] Patent Publication No.: CN106351603B discloses a leak plugging method for severe leaks in cracks or karst caves, and plugging materials are fed into pipe strings. The plugging materials are bridging aids such as rubber tire blocks, hydration swelling materials and shear thickening The liquid is sent into the pipe string to carry out the plugging operation of the lost section of the drilling. The disadvantage is that the pressure resistance is insufficient, and it is not suitable for the plugging operation in the lost section of the old well; The plugging success rate method, the plugging material is phosphate cement or aluminate cement added with quartz, calcite or marble particles, and the method of pre-cleaning, intermediate plugging and interval replacement is used for large-scale leak plugging
But its pressure test can only reach 15MPa, which cannot meet the plugging operation of old wells

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0050] A plugging material for a large loss casing section of an oil-water well, comprising a gel system and a resin system, the volume ratio of the gel system and the resin system is (4-8):(1-2).

[0051] The method for plugging the casing damage section of the oil-water well with large leakage includes the following operation process:

[0052] Step 1. Confirm the integrity of the upper wellbore in the casing damage section;

[0053] Step 2, setting up the drillable bridge plug at the lower part of the leakage casing damage section to establish an artificial platform;

[0054] Step 3: Test the water absorption of the lost casing section, and run a bottomhole pressure gauge at the lower end of the test suction string to test the bottomhole pressure P of the lost casing section under different displacements 0 ;

[0055] Step 4, according to the bottom hole pressure P obtained in step 3 0 , and use the Bernoulli equation to calculate the aperture size of the leakage casing se...

Embodiment 2

[0063] On the basis of Example 1, further, the gel system consists of the following raw materials in parts by weight: 100 parts of water, 0.35-0.45 parts of gel thickener, 0.3-0.5 parts of cross-linking agent, 5-8 parts of solid phase composition.

[0064] The gel thickener is polyacrylamide or polyacrylonitrile ammonium salt with a molecular weight of 3-4 million;

[0065] The crosslinking agent is one of zirconium lactate, zirconium hydroxide and zirconium silicate.

[0066] The solid phase composition is formed by mixing quartz sand: fiber: walnut shell in a mass ratio of 1: (1-2.5): (1-2.8).

[0067] The specific preparation method of the gel system is as follows: first, add the thickening agent of the formulation amount to 100 parts of water, stir for 10 to 20 minutes at a speed greater than 2000 rpm, and then let stand for 10 to 30 minutes until the viscosity of the system reaches After 70-120mPa·s, add the formulated amount of solid-phase composition, stir for 10-30 m...

Embodiment 3

[0069] On the basis of Example 1, further, the resin system includes the following raw materials in parts by weight:

[0070] Glycerol epoxy resin 100 parts

[0071] Resorcinol (curing agent) 8-10 parts

[0072] Aminophenolic resin 22.5-50 parts

[0073] Dioctyl phthalate (toughening agent) 12-15 parts

[0074] 1-3 parts of anilinomethyltrimethoxysilane (coupling agent);

[0075] Wherein, the epoxy value of the glycerol epoxy resin is 0.38-0.45.

[0076] The preparation method of described aminophenol-formaldehyde resin is: in the there-necked flask that thermometer, agitator and reflux condenser are housed, add phenol and mass concentration be 37% formaldehyde solution in the ratio of volume ratio 1:(1~1.8), then Based on the total volume (300-400ml) of the phenol and the formaldehyde solution, add ammonia water with a mass-volume ratio of 6-8%, stir and heat up to start reflux and react for 25-45min after the calculation time, and then the reaction time is 0.08-0.09MPa ...

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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.

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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Application Information

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IPC IPC(8): C09K8/44E21B33/13
CPCC09K8/422C09K8/426C09K8/44C09K2208/08E21B33/13
Inventor 郭钢李琼玮杨立华李明星孙雨来姜毅郭阳刘伟程碧海周佩
Owner PETROCHINA CO LTD
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