煤层顶板水平井分段压裂瓦斯治理模式研究  

Study on Gas Control Mode of Staged Fracturing Horizontal Wells in Coal Seam Roof

作　　者：王博 姜在炳[1] 杜天林 贾立龙 牟全斌 杨建超 陈崇枫 李浩哲 WANG Bo;JIANG Zaibing;DU Tianlin;JIA Lilong;MU Quanbin;YANG Jianchao;CHEN Chongfeng;LI Haozhe(Xi’an Research Institute of China Coal Technology&Engineering Group Corp.,Xi’an,Shaanxi 710054;Xi’an University of Science and Technology,Xi’an,Shaanxi 710054)

机构地区：[1]中煤科工集团西安研究院有限公司,陕西西安710054 [2]西安科技大学,陕西西安710054

出　　处：《中国煤炭地质》2023年第1期25-31,共7页Coal Geology of China

基　　金：陕西省自然基础研究计划项目(2022JQ-458);中煤科工集团西安研究院有限公司科技创新基金项目(2020XAYDC04)。

摘　　要：针对煤矿碎软低渗煤层,提出了煤层顶板水平井分段压裂瓦斯治理模式。通过建立应力-渗流-损伤耦合的理论模型,运用数值模拟的方法模拟了煤层顶板水平井水力压裂裂缝扩展过程,结果表明紧邻煤层顶板岩石的裂缝能够延展至煤层,且在顶板岩石的撕裂作用下,煤层内的裂缝能够快速延展。应用产能模拟的方法对分段压裂水平井的产能进行了模拟,分析瓦斯抽采的效率,优选了分段压裂的压裂缝长度、压裂段数,认为在淮北矿区祁东煤矿的地质条件下,压裂裂缝的长度为80 m,裂缝间距为63 m,抽采效果最佳。通过工程验证,说明煤层顶板水平井分段压裂技术是国内碎软低渗煤层地面瓦斯高效抽采的有效模式。Aiming at the broken soft and low permeability coal seam,gas control mode of staged fracturing horizontal wells in coal seam roof is proposed.Through the establishment of the theoretical model of stress seepage damage coupling,the hydraulic fracturing crack propagation process of the horizontal well in coal seam roof is simulated by using the numerical simulation method.The results show that the cracks in the roof rock adjacent to the coal seam can extend to the coal seam,and the cracks in coal seam can expand rapidly under the tearing action of the roof rock.The productivity simulation method is used to simulate the productivity of staged fracturing horizontal wells,analyze the efficiency of gas extraction,optimize the length of fracturing fractures and the number of fracturing sections for staged fracturing.Under the geological conditions of Qidong Coal Mine in Huaibei Mining Area,the length of fracturing fractures is 80 m,the spacing of fracturing fractures is 63 m,and the extraction effect is the best.Through engineering verification,it is shown that the staged fracturing technology of horizontal wells in coal seam roof is an effective mode for efficient surface gas extraction in fractured soft and low permeability coal seams in China.

关 键 词：水平井 瓦斯抽采 裂缝扩展规律 产能模拟 

分 类 号：TE19[石油与天然气工程—油气勘探]