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Encapsulation gel breaker and preparation method of encapsulation gel breaker

A technology of gel breaker and encapsulation, which is applied in the field of encapsulated gel breaker and its preparation, can solve problems such as failure to break the gel, and achieve the effect of improving the use efficiency.

Inactive Publication Date: 2013-04-10
SHANGHAI EVEREST FINE CHEMICALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The oxidative breaker is likely to be exhausted before reaching the target crack, thus failing to achieve the purpose of breaking

Method used

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  • Encapsulation gel breaker and preparation method of encapsulation gel breaker

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Embodiment Construction

[0020] refer to figure 1 As shown, the present invention discloses a preparation method of encapsulated breaker, the method comprises the following steps:

[0021] 102. Prepare a gel breaker by mixing esters and organic solvents in a mass ratio of 1:4-6 to prepare the gel breaker. In one embodiment, the ester used to prepare the breaker includes one or a combination of methyl formate, ethyl formate or dimethyl malonate, and the organic solvent used to prepare the breaker is petroleum ether.

[0022] 104. Forming microcapsules with a resin and injecting a breaker into the microcapsules.

[0023] 106. Preparation of a hydrolytically degradable coating formed from a composition of poly(2-alkyl cyanoacrylate). In one embodiment, the hydrolytically degradable coating is a composition comprising at least 50% by weight poly(2-alkyl cyanoacrylate). In another embodiment, the hydrolytically degradable coating comprises a composition of at least 80% by weight poly(2-alkyl cyanoacryla...

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Abstract

The invention discloses an encapsulation gel breaker, which comprises a micro-capsule formed by resin, and gel breakers are contained in the micro-capsule and comprise esters and organic solvents according to a mass ratio being 1:(4-6). A hydrolytic degradation coating is coated outside the micro-capsule formed by resin and is formed by poly(2-polyalkylcyanocraylate) compositions. The invention also discloses a preparation method of the encapsulation gel breaker. The preparation method comprises the following steps that the gel breaker is prepared, the esters and the organic solvents are mixed according to a mass ratio being 1:(4-6) for preparing the gel breaker; the micro-capsule is formed by the resin, and in addition, the gel breaker is filled into the micro-capsule; the hydrolytic degradation coating is prepared, and is formed by poly(2-polyalkylcyanocraylate) compositions; and the hydrolytic degradation coating is coated outside the micro-capsule formed by the resin. Through the encapsulation gel breaker and the preparation method of the encapsulation gel breaker provided by the invention, the encapsulation gel breaker with the ideal release speed can be provided, and the use efficiency of the gel breaker can be effectively improved.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to an encapsulated gel breaker and a preparation method thereof. Background technique [0002] In the middle and late stages of oilfield development, hydraulic fracturing of the underground layer is an effective method to improve the material efficiency of recovering petroleum products and the permeability of the underground layer, and is a commonly used means of increasing production. The principle of hydraulic fracturing is to pour viscous liquid fracturing fluid into the wellbore, apply pressure and cause fractures, so that the porosity and permeability of rock formations with low porosity and permeability will increase. During the fracturing process, it is necessary to maintain the fluidity of the fracturing fluid, so the breaker becomes an indispensable tool in fracturing construction. The role of the breaker is to reduce or break the viscosity of the fracturing fluid and main...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/92
Inventor 王广学
Owner SHANGHAI EVEREST FINE CHEMICALS CO LTD
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