Large-scale hydraulic fracturing and anti-permeability pre-extraction gas treatment technology for directional ultra-long drilling in roadway

Abstract

The invention provides a large-scale hydraulic-fracturing permeability-increasing pre-extraction gas control process used for directional ultra-long drilling of a roadway. The large-scale hydraulic-fracturing permeability-increasing pre-extraction gas control process used for directional ultra-long drilling of the roadway comprises the following steps that S1, a fractured interval is selected, anda coal bed section with a regular well diameter, a good coal body structure, a good permeability and a high gas content is selected according to a comprehensive drilling curve and a well-cementing result report; S2, drilling and sealing are started, a fracturing well mouth is mounted, a fracturing liquid tank is equipped, a Christmas tree is fixed, and construction equipment is put in place and are connected with high-pressure and low-pressure pipelines; S3, a pressure test is conducted on a ground high-pressure manifold and the well mouth; and S4, after the pressure test is completed, an open hole packer tool is tripped in to start fracturing construction, and finally, the fracturing construction is completed. Compared with the prior art, the large-scale hydraulic-fracturing permeability-increasing pre-extraction gas control process used for directional ultra-long drilling of the roadway has the beneficial effects that the gas extraction efficiency and the gas extraction rate of directional ultra-long drilling are improved, and the production safety of coal mines is further guaranteed.

Description

technical field [0001] The invention relates to the field of gas mining technology, in particular to a large-scale hydraulic fracturing technology for directional ultra-long drilling in roadways, anti-reflection and pre-pumping gas treatment technology. Background technique [0002] At present, directional ultra-long drilling has been widely used in coal mine gas pre-extraction. This process can greatly increase the gas pressure relief area and gas flow channel. However, in the face of a large amount of structural coal and pulverized coal, the directional ultra-long drilling will be blocked by pulverized coal shortly after the hole is formed, mainly because the pulverized coal particles in the tunnel will be affected by Negative pressure traction produces migration, and during the migration process, stacking forms blockages, which leads to a rapid reduction in the effect of gas pre-pumping, or even invalidation soon, resulting in a waste of drilling investment. Contents of...

AI Technical Summary

Problems solved by technology

However, in the face of a large amount of structural coal and pulverized coal, the directional ultra-long drilling will be blocked by coal powder shortly after the hole is formed. Negative pressure traction produces migration, and during the migration process, it is stacked to form a blockage, which leads to a rapid reduction in the gas pre-pumping effect, or even invalidation soon, resulting in a waste of drilling investment