Coal Engineering ›› 2025, Vol. 57 ›› Issue (4): 138-144.doi: 10. 11799/ ce202504020

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Evaluation method and application of auxiliary outburst elimination effect of horizontal well with staged fracturing of CBM in coal mining area

jiang wenping   

  • Received:2024-03-22 Revised:2024-08-05 Online:2025-04-10 Published:2025-05-28
  • Contact: jiang wenping E-mail:jwp1225@126.com

Abstract:

In view of the increasing application of CBM subsection fracturing horizontal well technology in coal mining area, the present research mainly aims at the technical adaptability and the technical front end, the evaluation index and evaluation method of the extraction effect of are studied. On the basis of revealing the main geological factors that affect the gas production, combining with the requirements and norms of gas extraction and prevention and control in coal mine, the evaluation index of the extraction effect is established, including assistant outburst elimination evaluation index (remaining maximum gas content and remaining maximum reservoir pressure) , gas production effect evaluation index (recovery factor and cumulative gas production). The method of determination of the scope of outburst elimination evaluation and the maximum extraction influence range are proposed respectively. The effect of auxiliary outburst elimination and gas production are divided into three grades, and the grades of the two classifications are not identical. Four kinds of evaluation methods are put forward, which are analogy method, extraction data calculation method, prediction simulation method and actual measurement method, the applicable conditions and application steps of each method are compared and analyzed. The evaluation indexes and methods were applied to CBM01 in Huainan coal mining area, and the auxiliary outburst elimination effect and extraction effect were analyzed when the well was drained to 415d and 829d. It is considered that the horizontal well with staged fracturing is an efficient method for gas prevention and outburst elimination in coal mining area.

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