Fracturing fluid for coal-bed gas well and use thereof

Abstract

The invention discloses a fracturing fluid for a coal-bed gas well and a use thereof. The fracturing fluid comprises water, an antiswelling agent, a discharge aiding agent, a coal dust dispersant and chlorine dioxide, wherein the content of chlorine dioxide is in a range of 0.01-0.10wt%. The fracturing fluid improves coal seam seepage conditions, enlarges a flow discharge area, improves a single well yield and improves critical desorption pressure.

Description

technical field [0001] The invention relates to fracturing transformation of coal bed gas wells, in particular to a fracturing fluid for coal bed gas wells. The present invention also relates to the application of the above-mentioned fracturing fluid. Background technique [0002] Unlike conventional natural gas, coalbed methane belongs to the field of unconventional oil and gas reservoirs. Coalbed methane is mainly stored in the inner surface of coal matrix pores in the state of adsorption, and only a small amount is stored in free state in coal cleats and other fractures. The output of CBM must go through the process of analysis-diffusion-seepage. Since the permeability of coalbed methane reservoirs generally decreases, the average is generally 0.3-0.5×10 -3 μm 2 , and also has the characteristics of low porosity and low pressure. For the vast majority of coalbed methane wells, if hydraulic fracturing stimulation measures are not implemented, many wells will have no ind...

AI Technical Summary

Problems solved by technology

However, the fracturing fluid in the prior art cannot increase the critical desorption pressure, resulting in insufficient recovery of coalbed methane