煤矿区煤层气分段压裂水平井辅助消突效果评价方法及应用

doi:10. 11799/ ce202504020

摘要/Abstract

摘要：

针对煤层气分段压裂水平井技术在煤矿区的应用逐渐增多这一情况，以及当前研究主要集中在技术适应性和工艺前端的现状，开展了该技术在煤矿区抽采效果评价指标与评价方法的研究工作。揭示了煤层气分段压裂水平井产气效果的主要地质影响因素之后，确定该技术对煤矿瓦斯抽采的辅助消突评价指标为剩余最大气含量和剩余最大储层压力；结合煤矿瓦斯防治要求，确定该技术的辅助消突评价单元为水平段长度及其两侧各15~20m的控制范围；并依据地面井抽采前后煤层气含量与储层压力的变化情况，将辅助消突效果划分为好、中、差三个级别。此外, 综合考虑煤层气分段压裂水平井抽采效果特殊性以及其不同评价方法的特点，提出了预测模拟与钻孔检测相结合的综合评价方法，并将该方法应用于淮南矿区CBM01 井，分析评价了该井排采至415d、829d时的辅助消突效果。研究表明，所建立的评价指标及评价方法具有较好的实用性，同时进一步证明了煤层气分段压裂水平井是煤矿区瓦斯防治与消突的高效方式。

关键词:

煤层气（瓦斯）, 分段压裂水平井 , 辅助消突效果 , 瓦斯防治

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.

中图分类号:

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TD712

降文萍, 张群, 吴静.

煤矿区煤层气分段压裂水平井辅助消突效果评价方法及应用 [J]. 煤炭工程, 2025, 57(4): 138-144.

jiang wenping.

Evaluation method and application of auxiliary outburst elimination effect of horizontal well with staged fracturing of CBM in coal mining area [J]. Coal Engineering, 2025, 57(4): 138-144.

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