刘欣佳, 张遂安, 靳建虎, 肖凤朝, 王瑞杰, 万毅, 张守仁. 煤成(层)气资源综合开发中的合层压裂可行性评价[J]. 煤炭学报, 2018, (6). DOI: 10.13225/j.cnki.jccs.2018.4038
引用本文: 刘欣佳, 张遂安, 靳建虎, 肖凤朝, 王瑞杰, 万毅, 张守仁. 煤成(层)气资源综合开发中的合层压裂可行性评价[J]. 煤炭学报, 2018, (6). DOI: 10.13225/j.cnki.jccs.2018.4038
LIU Xinjia, ZHANG Suian, JIN Jianhu, XIAO Fengchao, WANG Ruijie, WAN Yi, ZHANG Shouren. Feasibility evaluation of commingle fracturing in the integrated development of coal-derived gas resources[J]. Journal of China Coal Society, 2018, (6). DOI: 10.13225/j.cnki.jccs.2018.4038
Citation: LIU Xinjia, ZHANG Suian, JIN Jianhu, XIAO Fengchao, WANG Ruijie, WAN Yi, ZHANG Shouren. Feasibility evaluation of commingle fracturing in the integrated development of coal-derived gas resources[J]. Journal of China Coal Society, 2018, (6). DOI: 10.13225/j.cnki.jccs.2018.4038

煤成(层)气资源综合开发中的合层压裂可行性评价

Feasibility evaluation of commingle fracturing in the integrated development of coal-derived gas resources

  • 摘要: 针对临兴—神府示范区煤(成)层气资源纵向上岩性叠置、多层系交互赋存、薄层/夹层发育的地质赋存特征,及薄互层、接触或邻近产层间单层压裂可改造性差的技术难题,提出了适用于煤成(层)气资源综合开发的合层压裂工艺理念。采用数值模拟方法,通过分析产层间界面胶结强度、界面倾角、层间应力差、压裂施工排量等因素对合层压裂裂缝扩展的影响,优化了压裂施工参数,优选了适宜于合层压裂工艺的储层条件,并基于岩石破裂和界面断裂准则,综合考虑煤体结构、界面力学与储层应力场等因素,建立了煤成(层)气储层合层压裂可行性的多级评价模型。

     

    Abstract: The geological characteristics of coal-derived gas resources in Linxing and Shenfu area show a multi-layer system vertically,a superposition and mutual occurrence of lithology,as well as the development of thin interlayers and a low effective rate by monolayer fracturing within these thin interlayers or directly / closely-contact layers. A multilayer fracturing technology for exploring and developing the coal-derived gas resources was introduced in this paper. By nu- merical simulation method,the paper studied the influences of cementation strength and dip angle of interface,stress difference between layers,fracturing operation displacement and other factors on fracture propagation. Also,the fractu- ring operation parameters were optimized,then a suitable reservoir conditions for multilayer fracturing was determined. Based on rock crack criterion and interface fracture criterion,a multilevel evaluation model of multilayer fracturing fea- sibility in coal-derived gas reservoir was finally established,with factors like coal structure,interface mechanics and stress field taken into account. The study has a certain guiding significance to the application of the multilayer fractu- ring technology.

     

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