Method and system for identifying water-resisting layer in coal mine hydrogeology

In the hydrogeological exploration of coal mines, combining the formation profile information obtained from drilling and the consumption of circulating fluid, key sections were determined and closed water injection tests were carried out, and the problem of traditional methods was difficult to accurately identify thin aquifers, and the precise identification and thickness measurement of gravel thin layers were achieved, providing reliable technical support for coal seam mining and underground engineering.

CN119715292APending Publication Date: 2025-03-28SHAANXI COAL CAOJIATAN MINING CO LTD +2
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Patent Information

Application Number
CN202411636238.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-15
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

Traditional aquifer identification methods are difficult to achieve accurate identification of thin aquifers, especially in loose or weakly cemented formations, where there are problems of low accuracy and large error in layer determination.

Method used

By constructing exploration drilling in the research area, continuous formation profile information is obtained, and the consumption of circulating fluid is monitored during the drilling process, and the permeability of the formation is initially judged. Based on the formation profile information and permeability judgment, the key layer segments are determined, and the water injection is closed in these layer segments to measure the water consumption to identify the specific location and thickness of the thin aquifer whose permeability is greater than the preset threshold.

Benefits of technology

It realizes accurate identification of the thin layer of sand and gravel with good permeability, provides reliable parameter selection and water control scheme design, and provides important technical support for coal seam mining and underground engineering excavation.

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Abstract

The invention provides a method and system for identifying a water-resisting layer in coal mine hydrogeology, and the method comprises the steps: carrying out the exploration drilling in a research region, carrying out the rock core collection in a drilling process, and obtaining the continuous stratum section information; monitoring the consumption of circulating liquid in the drilling process, and preliminarily judging the permeability of the stratum according to the consumption of the circulating liquid in different stratum sections; determining a key interval by combining continuous stratum profile information mastered by drilling and the preliminarily judged stratum permeability; dividing the key layer section into a plurality of test sections, performing closed water injection in each test section, metering the consumption of water in different test sections under constant pressure, identifying the specific position of the thin aquifer of which the permeation amount is greater than a preset threshold value according to the consumption, and obtaining the thickness of the thin aquifer at the corresponding position, according to the method, the specific position and thickness of the thin aquifer with good permeability can be accurately identified, and a reliable basis is provided for parameter optimization and water prevention and control scheme design of coal seam underground mining or underground engineering excavation.
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