Fracturing agent and fracturing method of coalbed methane horizontal well

Abstract

The embodiment discloses a fracturing agent and a fracturing method of a coalbed methane horizontal well. The fracturing agent comprises sand-carrying fluid and fracturing sand, wherein the sand-carrying liquid consists of potassium chloride water solution with the concentration of 5-10 percent, and nitrogen gas in foam state and with the foam quality of 50-80 percent. In the embodiment of the invention, the sand-carrying liquid in the fracturing agent is high-concentration potassium chloride water solution, so that the expansion coefficients of clay mineral and other geological materials in contact with the fracturing agent are effectively controlled; and besides, as nitrogen gas in the foam state is further added into the fracturing agent of the embodiment, sufficient fracturing sand can be carried by lower consumption of sand-carrying liquid, the consumption of sand-carrying liquid is effectively reduced, and accordingly, the moisture absorbing capacity of clay mineral and other geological materials is reduced and damage to the geological structure of a gas reservoir is also decreased.

Description

technical field [0001] The invention relates to the field of coal bed gas exploitation, more specifically, to a fracturing agent and a coal bed gas horizontal well fracturing method. Background technique [0002] In the construction process of coalbed methane, one process is to implement fracturing in the horizontal section of the horizontal wellbore. The purpose of implementing fracturing includes: to more effectively connect the natural fractures of the geological structure in the gas reservoir in the horizontal section of the horizontal wellbore with the wellbore, thereby increasing the leakage area of ​​coalbed methane, and then improving the gas recovery efficiency. In addition, through the implementation of fracturing, the number of fractures in the geological structure of the gas reservoir in the horizontal section of the horizontal wellbore can be effectively increased, as well as the width and depth of the fractures, thereby achieving the purpose of increasing the p...

AI Technical Summary

Problems solved by technology

[0005] After high-pressure hydraulic fracturing, clay minerals and other geological materials in the geological structure of the gas storage layer at the corresponding location will absorb a large amount of water and expand, thereby damaging the geological structure of the gas storage layer. Moreover, after the expansion of clay minerals and other geological materials It will also block the cracks around the wall of the horizontal section of the horizontal wellbore, hindering the leakage of coalbed methane in the gas storage layer, thereby affecting the extraction efficiency of coalbed methane

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