Encapsulated gel breaker for hydraulic fracturing of coalbed methane well, as well as preparation and using methods thereof

Abstract

The invention discloses an encapsulated gel breaker for hydraulic fracturing of a coalbed methane well, as well as preparation and using methods thereof. The encapsulated gel breaker for hydraulic fracturing of the coalbed methane well comprises a gel breaker constituted by nonylphenol polyoxyethylene ether and a capsule wrapping the gel breaker, wherein the capsule is made of polylactic acid. The preparation method of the encapsulated gel breaker for hydraulic fracturing of the coalbed methane well comprises the following steps: preparing the gel breaker, namely nonylphenol polyoxyethylene ether into particles; and atomizing a wrapping material, namely polylactic acid, and enabling polylactic acid to meet with the gel breaker in hot air to form the capsule wrapping on the surface of the gel breaker. The using method of the encapsulated gel breaker for hydraulic fracturing of the coalbed methane well comprises the following steps: adding the encapsulated gel breaker and a fracturing proppant into a clean fracturing solution together, and then performing fracturing construction by using the clean fracturing solution. The invention provides the encapsulated gel breaker for hydraulic fracturing of the coalbed methane well, which can be matched with the clean fracturing solution containing an organic sodium salt and a cationic surfactant and get good effects, as well as the preparation and the using methods thereof.

Description

technical field [0001] The invention relates to the field of coalbed gas exploration and development, in particular to a gel breaker for hydraulic fracturing of coalbed gas wells and a preparation and use method thereof. Background technique [0002] Coalbed methane reservoirs are characterized by low porosity and low permeability, and generally require fracturing to obtain better gas production. Fracturing refers to using a fracturing vehicle to squeeze a liquid with a certain viscosity into the formation under high pressure and large displacement conditions. After the formation is pressed out of the cracks, a fracturing proppant (such as quartz sand, etc.) is added to fill the cracks and improve the reservoir quality. Penetration ability to increase yield. During the construction process, it is necessary to use clean fracturing fluid with a certain viscosity to carry the fracturing proppant into the formation, and this process is a sand-carrying process. After the sand-c...

AI Technical Summary

Problems solved by technology

But in the prior art, there is no capsule gel breaker that cooperates well with the organic sodium salt and cationic surfactant cleaning fracturing fluid

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