A kind of microcapsule gel breaker and its preparation method and application

A technology of gel breaker and microcapsule, applied in the field of microcapsule gel breaker and its preparation, can solve the problems of high price of ethyl cellulose, unfavorable large-scale promotion, high equipment requirements and the like, and achieves high sphericity and good processing. Performance, the effect of simple processing technology

Active Publication Date: 2019-09-24
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high price of ethyl cellulose, it is not conducive to large-scale promotion; moreover, the preparation of microcapsule gel breakers by traditional pharmaceutical technology often has the problems of complicated processing technology and high requirements for equipment. For example, it has been successfully applied The fluidized bed method used in the field of oil and gas reservoir recovery also has the above-mentioned problems

Method used

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  • A kind of microcapsule gel breaker and its preparation method and application
  • A kind of microcapsule gel breaker and its preparation method and application
  • A kind of microcapsule gel breaker and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] 1) At room temperature (25° C.), add 1.0 g of ABS to a three-necked flask pre-filled with 30 mL of dichloromethane, and stir thoroughly to obtain a polymer solution.

[0052] 2) Weigh 0.5 g of ammonium persulfate powder and add it to the polymer solution at a stirring rate of 450 rpm to uniformly disperse the ammonium persulfate powder to obtain a dispersion.

[0053] 3) Under the condition that the stirring speed is maintained at about 300 rpm, a total of about 20 mL of polydimethylsiloxane with a viscosity of 3000 cSt is slowly added dropwise to the above dispersion to obtain a mixture.

[0054] 4) Pour the mixture quickly into a round-bottomed three-necked flask pre-filled with 250mL n-heptane and equipped with a condensation device, and stir for about 30 minutes at a stirring rate of 450 rpm. It can be observed that solid particles are separated out and gradually dispersed completely. Dispersion system.

[0055] 5) Heat the above-mentioned dispersion system and heat it at 4...

Embodiment 2～3

[0059] The methods for preparing microcapsule breakers in Examples 2 to 3 are basically the same as Example 1, except that the viscosity of the polydimethylsiloxane used in step 3) is 1000 cSt and 5000 cSt, respectively.

Embodiment 4～5

[0061] The methods for preparing microcapsule breakers in Examples 4 to 5 are basically the same as in Example 1, except that the masses of ABS used in step 1) are 0.8 g and 1.25 g, respectively.

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Abstract

The invention provides a microcapsule gel breaker as well as a preparation method and application thereof. A microcapsule comprises a core material and a wall material covering the core material. Thewall material is an acrylonitrile-butadiene-styrene copolymer. The preparation method of the microcapsule gel breaker comprises the following steps: dissolving the wall material into a solvent to obtain a polymer solution; dispersing the core material into the polymer solution to obtain dispersion liquid; in a stirring state, dropwise adding a coagulation inducer into the dispersion liquid to coagulate the wall material, thus obtaining a mixture; pouring the mixture into a curing agent, and keeping stirring to separate solid particles, thus obtaining a cured system; collecting the solid particles in the cured system to prepare the microcapsule gel breaker. According to the microcapsule gel breaker provided by the invention, the acrylonitrile-butadiene-styrene copolymer is used as the wallmaterial, so that the microcapsule gel breaker is more suitable for actual production, and a processing technology is simple; the microcapsule gel breaker can be better applied to oil and gas reservoir recovery.

Description

Technical field [0001] The invention relates to the technical field of petroleum and natural gas survey and development, in particular to a microcapsule breaker and its preparation method and application. Background technique [0002] It is a long-term and challenging task to cost-effectively improve the recovery rate of low-permeability oil and gas reservoirs. Fracturing engineering is an important measure to increase low-permeability oil and gas production, and the polymer fracturing fluid used in construction must be completely broken to achieve better results. The reason is that if the gel is not completely broken and remains in the artificial fractures, on the one hand, it will cause secondary damage to the formation. On the other hand, if the polymer fracturing fluid is concentrated on the fracture wall to form a filter cake, it will also significantly reduce the artificial fractures. The diversion capacity. [0003] In order to achieve complete breakage of the fracturing f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/70B01J13/08
Inventor 周倩黄福芝柯扬船胡旭
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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