Coal Geology & Exploration


In order to study the hydraulic fracture geometry in high-dip coal seam, a large-scale true triaxial fracturing simulation system was used to carry out physical simulation experiments, and the hydraulic fracture geometry of the maximum horizontal principal stress along the strike direction and along the dip direction-in 60° dip coal seam were investigated respectively. Experimental results of the maximum principal stress direction along the strike direction show that: hydraulic fracture initiation is easily; fracture height is limited in the whole time; fracture connectivity is good; fracture propagates mainly along bedding and natural fracture, vertical fracture is formed; the influence of high-dip on stimulation is relatively small; massive volume stimulation is needed. Experimental results of the maximum principal stress direction along the dip direction show that: hydraulic fracture initiation is hard; fracture height is limited in the early time and out of control in the later period; fracture connectivity is poor; fracture is not easy to form influenced by joint, and hydraulic fracture propagates difficultly; fracture diversion and multi-stage breakdown can be observed in the fracturing curve; small volume but multi-stage stimulation is needed. The experimental results have a good guiding effect on the stimulation model and scale determination of the high-dip coal seam in Xinjiang and other regions.


coalbed methane, high-dip angle, stress direction, hydraulic fracture geometry, physical simulation, constraction scale, Xinjiang Fukang




[1] 陶小晚,王俊民,胡国艺,等. 新疆煤层气勘探开发现状及展望[J]. 天然气地球科学,2009,20(3):454-459. TAO Xiaowan,WANG Junmin,HU Guoyi,et al. Current situation and prospect for exploration and development of coalbed methane in Xinjiang[J]. Natural Gas Geoscience,2009,20(3):454-459.

[2] 曹运兴,石玢,田林,等. 大倾角厚煤层煤层气开发水平井方位优化和实贱:以新疆阜康矿区为例[J]. 煤田地质与勘探,2018,46(2):90-96. CAO Yunxing,SHI Bin,TIAN Lin,et al. Optimization and practice of horizontal well azimuth in thick and high dip-angle coalbed in Fukang mining area[J]. Coal Geology & Exploration,2018,46(2):90-96.

[3] 程亮,卢义玉,葛兆龙,等. 倾斜煤层水力压裂起裂压力计算模型及判断准则[J]. 岩土力学,2015,36(2):444-450. CHENG Liang,LU Yiyu,GE Zhaolong,et al. Initiation pressure calculation model and judgment criterion for hydraulic fracturing of inclined coal seam[J]. Rock and Soil Mechanics,2015,36(2):444-450.

[4] 谢相军. 大倾角煤层压裂裂缝延展规律及技术对策研究[D]. 西安:西安科技大学,2015. XIE Xiangjun. Study on fracture propagation rule and technical methods of coal seam with high dip angle[D]. Xi'an:Xi'an University of Science and Technology,2015.

[5] 罗骁. 大倾角煤层L井压裂技术研究[D]. 成都:西南石油大学,2016. LUO Xiao. Hydraulic fracturing study of L well with large dip angle in coal seam[D]. Chengdu:Southwest Petroleum University,2016.

[6] 高建成,田慧玲. 不同倾角煤层下水力压裂影响分析[J]. 煤炭技术,2017,36(1):190-192. GAO Jiancheng,TIAN Huiling. Analysis on impact of hydraulic fracturing under different dip angle of coal seam[J]. Coal Technology,2017,36(1):190-192.

[7] 王志荣,胡凯,杨杰,等. 软煤储层顶板水平井穿层工况下压裂缝扩展模型[J]. 煤田地质与勘探,2019,47(6):20-25. WANG Zhirong,HU Kai,YANG Jie,et al. Extension model of fracturing cracks of translayer horizontal well in roof of soft coal reservoir[J]. Coal Geology & Exploration,2019,47(6):20-25.

[8] NOLTE K G. Fracturing pressure analysis for non-ideal behavior[J]. Journal of Petroleum Technology,1991,43(2):210-218.

[9] AYOUB J A,BROWN J E,BARREE R D,et al. Diagnosis and evaluation of fracturing treatments[J]. SPE Production Engineering,1992,7(1):39-46.

[10] 唐书恒,朱宝存,颜志丰. 地应力对煤层气井水力压裂裂缝发育的影响[J]. 煤炭学报,2011,36(1):65-69. TANG Shuheng,ZHU Baocun,YAN Zhifeng. Effect of crustal stress on hydraulic fracturing in coalbed methane wells[J]. Journal of China Coal Society,2011,36(1):65-69.

[11] 周彤,张士诚,邹雨时,等. 四川盆地东北缘强应力大倾角页岩储层水力压裂裂缝形态[J]. 新疆石油地质,2016,37(3):336-341. ZHOU Tong,ZHANG Shicheng,ZOU Yushi,et al. Hydraulic fracture geometry of shale gas reservoirs with strong tectonic stress and large dip angle in northeastern margin of Sichuan basin[J]. Xinjiang Petroleum Geology,2016,37(3):336-341

[12] 李宁. 渝东北大倾角页岩储层压裂改造研究[D]. 北京:中国石油大学(北京),2016. LI Ning. Investigation into the fracturing treatment for shale formation with large dip angle in northeast of Chongqing[D]. Beijing:China University of Petroleum(Beijing),2016.

[13] 杨武剑. 高倾角煤层压裂裂缝延伸规律及压裂措施研究[D]. 成都:西南石油大学,2015. YANG Wujian. Fracture propagation and fracturing treatments in high dip angle coal seam[D]. Chengdu:Southwest Petroleum University,2015.

[14] 张壮. 煤层气井压后返排工艺[J]. 煤田地质与勘探,2017,45(5):70-74. ZHANG Zhuang. Flowback technology after fracturing of CBM wells[J]. Coal Geology & Exploration,2017,45(5):70-74.

[15] 黄炳香,李浩泽,程庆迎,等. 煤层压裂裂缝内支撑剂的压嵌特性[J]. 天然气工业,2019,39(4):48-54. HUANG Bingxiang,LI Haoze,CHENG Qingying,et al. Compaction and embedment characteristics of proppant in hydraulic fractures of coal seams[J]. Natural Gas Industry,2019,39(4):48-54.



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