A kind of water-soluble temporary plugging ball and its preparation method and application

A temporary plugging ball, water-soluble technology, applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc. The plugging effect is remarkable, the treatment efficiency is improved, and the profile control process is simplified.

Active Publication Date: 2021-08-27
北京贝斯特佳科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The temporary plugging balls currently used are all water-insoluble balls. After the profile control process is completed, the temporary plugging balls will continue to remain in the casing, which will cause inconvenience to subsequent construction and increase the difficulty of the process.
Therefore, the temporary blocking ball needs to be recovered, and the existing temporary blocking ball recovery process generally has the problems of complicated operation procedures and low recovery rate of the temporary blocking ball
And if the temporary blocking ball is left in the wellbore, it will seriously affect the follow-up operation
In the same way, when the temporary plugging ball is used in selective fracturing, leaking well flushing and temporary plugging, there will be similar problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] S11, the degree of polymerization is 1800, the degree of alcoholysis is 90% (density is 1.27g / cm 3 ) polyvinyl alcohol with a diameter of 11-50μm (content greater than 90%), a maximum particle size of 60μm (content less than 10%), and a true density of 0.6g / cm 3 The hollow glass microspheres were mixed at a volume ratio of 2:3, kneaded and granulated at 180°C to obtain a density of 1.00±0.02g / cm 3 mixture;

[0041] S12, inject the mixture at a temperature of 180°C, and control the injection pressure of the spherical mold to be 80MPa;

[0042] S13. Cool the spherical mold with cooling water at 20°C, and open the mold to obtain a density of 1.00±0.02g / cm 3 The temporary blocking ball.

Embodiment 2

[0044] S21. Polyvinyl alcohol with a degree of polymerization of 2400 and a degree of alcoholysis of 95% (density of 1.31 g / cm 3 ) with a diameter of 11-50μm (content greater than 90%), a maximum particle size of 60μm (content less than 10%), and a true density of 0.6g / cm 3 The hollow glass microspheres were mixed at a volume ratio of 1:1.3, kneaded and granulated at 190 °C, and the density was 1.00±0.02g / cm 3 mixture;

[0045] S22, injecting the mixture at a temperature of 210°C, and controlling the injection pressure of the spherical mold to be 60MPa;

[0046] S23. Cool the spherical mold, and open the mold to obtain a density of 1.00±0.02g / cm 3 The temporary blocking ball.

Embodiment 3

[0048] S31. Combine polyvinyl alcohol with a degree of polymerization of 550 and 1800 and a degree of alcoholysis of 98% with a diameter of 11-50 μm (content greater than 90%), a maximum particle size of 60 μm (content less than 10%), and a true density of 0.6g / cm 3 The hollow glass microspheres were mixed at a volume ratio of 2:3, kneaded and granulated at 195°C to obtain a mixture;

[0049] S32, injecting the mixture at a temperature of 200°C, and controlling the injection pressure of the spherical mold to be 70MPa;

[0050] S33. Cool the spherical mold, and open the mold to obtain a density of 1.31±0.02g / cm 3 , the initial dissolution temperature is 90 ℃ temporary blocking ball.

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Abstract

The invention relates to the technical field of petroleum exploitation, in particular to a water-soluble temporary plugging ball and its preparation method and application, wherein the raw material composition of the temporary plugging ball includes polyvinyl alcohol and hollow glass microspheres with different degrees of polymerization; The degree of polymerization is 500-5000; the degree of alcoholysis of polyvinyl alcohol is 70-100%, and the true density of the hollow glass microspheres is less than 0.6g / cm 3 , the diameter of the hollow glass microspheres is not greater than 80 μm. The water-soluble temporary plugging ball of the present invention can not only meet the requirements of the mechanical properties of the temporary plugging ball in the profile control process, but also the distribution probability of plugging the blast hole in the wellbore is basically consistent with the distribution ratio of the working fluid of the measure. In addition, the present invention The temporary plugging ball can be completely dissolved in water, which saves the process of recycling the temporary plugging ball, and the water-soluble temporary plugging ball also includes the process of absorbing liquid and swelling before it is completely dissolved. After swelling, the temporary plugging ball is hard inside and full externally. Under the action of the working hydraulic pressure difference of the measures, it can be tightly compacted on the blast hole, and its sealing effect is more significant.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a water-soluble temporary plugging ball and its preparation method and application. Background technique [0002] With the improvement of oilfield exploitation, the demand for technological measures such as layered fracturing, layered acidification, and temporary plugging and flushing is becoming more and more vigorous. Therefore, the implementation cost of measures has been greatly increased. By putting the temporary plugging ball from the wellhead, no operation is required, and the pipe string is not moved, and the temporary plugging ball is used to plug the blasthole of the high-permeability layer, which can adjust the liquid absorption profile, realize selective fracturing, selective acidification, and temporary plugging of the lost well flushing Waiting for the process. [0003] The mechanism of temporary plugging ball profile control is to relatively change...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/516C09K8/508E21B33/13
CPCC09K8/5083C09K8/516E21B33/13
Inventor 石在虹张洪君
Owner 北京贝斯特佳科技有限公司
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