Method for exploring goaf in coal seam based on directional drilling hydraulic fracturing

CN119641432BActive Publication Date: 2026-08-11中煤能源研究院有限责任公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-11-26
Publication Date
2026-08-11

AI Technical Summary

Technical Problem

[0003]本发明的目的是提供煤层内基于定向钻孔水力压裂的老空区探查方法，解决了现有技术中存在的通过增加钻孔密度才能探清老空区的位置的问题

Benefits of technology

[0025] This invention utilizes long-distance directional drilling in underground mines to conduct hydraulic fracturing of coal seams, enabling the hydraulically fracturing fractures to connect the directional boreholes with the old goaf. The monitoring data of the hydraulic fracturing process reflects the threat level of the goaf and lays the foundation for the drainage of water and hardened material. At the same time, after the hydraulically fracturing fractures guide water from the old goaf, the water can be drained through the directional boreholes. This improves the effectiveness of old goaf water exploration without requiring a large amount of additional drilling work, and provides technical support for old goaf water exploration.

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Abstract

This invention discloses a method for exploring old goaf areas in coal seams based on directional drilling and hydraulic fracturing, specifically implemented according to the following steps: Step 1, conduct hydraulic fracturing tests on the coal seam to determine the hydraulic fracturing radius; Step 2, determine the spacing of directional boreholes based on the hydraulic fracturing radius; Step 3, construct directional boreholes according to the spacing determined in Step 2 and perform segmented hydraulic fracturing, while monitoring data during the hydraulic fracturing process; Step 4, determine the development status of old goaf areas based on the hydraulic fracturing monitoring data; Step 5, determine the subsequent borehole construction plan based on the communication between the hydraulic fracturing fractures in the directional boreholes and the old goaf areas. This invention solves the problem in the prior art that the location of water in old goafs can only be determined by increasing the borehole density.
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Citation Information

Patent Citations

  • Old dead zone detection method based on fracturing principle

    CN104358558A