密切割分段压裂工艺在深层页岩气Zi2井的应用
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摘要
深层页岩储集层高温、高地应力、高水平应力差特征明显,常规分段压裂后,储集层改造体积偏低,裂缝复杂程度偏低,气井测试产量偏低。主要原因是,深层页岩气井压裂施工期间高泵注压力、低施工排量在常规分段参数条件下不利于提高裂缝复杂程度,导致簇间储量动用不充分。为提高工艺技术适用性及储集层改造效果,开展了深层页岩气压裂工艺优化研究,结果表明,密切割分段压裂工艺有利于增加簇间应力干扰,提高裂缝复杂程度,提升簇间资源动用效率。Zi2井初期采用常规分段压裂工艺,在压裂设计指标执行率较低的情况下,开展了密切割分段压裂工艺现场试验,裂缝复杂程度及单井储集层改造体积提升明显,证明了密切割分段压裂工艺在研究区深层页岩气井中的适用性。
Deep shale reservoirs are characterized by high temperature,high in-situ stress and large horizontal stress difference.After the implementation of conventional staged fracturing,the stimulated reservoir volume is usually relatively small,the level of fracture complexity and the test yield of gas wells are low.It is concluded that high pump injection pressure and low flow rate during the staged fracturing are the main reasons leading to insufficient reservoir stimulation in deep shale gas wells.To improve the adaptability of the technology and the effect of reservoir stimulation,the study on fracturing optimization for deep shale gas is carried out.The simulation results show that the intensive staged fracturing is good for increasing stress interference between clusters and improving both fracture complexity and stimulated reservoir volume.The conventional staged fracturing technology was initially adopted in the Well Zi-2,and then a field test for intensive staged fracturing was carried out.The test results show that the fracture complexity and stimulated reservoir volume are significantly improved,indicating the applicability of the intensive staged fracturing technology in the deep shale gas wells in the study area.
Deep shale reservoirs are characterized by high temperature,high in-situ stress and large horizontal stress difference.After the implementation of conventional staged fracturing,the stimulated reservoir volume is usually relatively small,the level of fracture complexity and the test yield of gas wells are low.It is concluded that high pump injection pressure and low flow rate during the staged fracturing are the main reasons leading to insufficient reservoir stimulation in deep shale gas wells.To improve the adaptability of the technology and the effect of reservoir stimulation,the study on fracturing optimization for deep shale gas is carried out.The simulation results show that the intensive staged fracturing is good for increasing stress interference between clusters and improving both fracture complexity and stimulated reservoir volume.The conventional staged fracturing technology was initially adopted in the Well Zi-2,and then a field test for intensive staged fracturing was carried out.The test results show that the fracture complexity and stimulated reservoir volume are significantly improved,indicating the applicability of the intensive staged fracturing technology in the deep shale gas wells in the study area.
引文
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[3]门晓溪,韩志辉,王磊.页岩气资源勘探开发历史及现状[J].新疆石油地质,2018,39(3):373-376.MEN Xiaoxi,HAN Zhihui,WANG Lei.History and current situation of shale gas exploration and development[J].Xinjiang Petroleum Geology,2018,39(3):373-376.
[4]邹才能,董大忠,王社教,等.中国页岩气形成机理、地质特征及资源潜力[J].石油勘探与开发,2010,37(6):641-653.ZOU Caineng,DONG Dazhong,WANG Shejiao,et al.Geological characteristics,formation mechanism and resource potential of shale gas in China[J].Petroleum Exploration and Development,2010,37(6):641-653.
[5]马新华.天然气与能源革命--以川渝地区为例[J].天然气工业,2017,37(1):1-8.MA Xinhua.Natural gas and energy revolution:a case study of Sichuan-Chongqing gas province[J].Natural Gas Industry,2017,37(1):1-8.
[6]邹才能,董大忠,王玉满,等.中国页岩气特征、挑战及前景(一)[J].石油勘探与开发,2015,42(6):689-701.ZOU Caineng,DONG Dazhong,WANG Yuman,et al.Shale gas in China:characteristics,challenges and prospects(Ⅰ)[J].Petroleum Exploration and Development,2015,42(6):689-701.
[7]谢军.关键技术进步促进页岩气产业快速发展--以长宁-威远国家级页岩气示范区为例[J].天然气工业,2017,37(12):1-10.XIE Jun.Rapid shale gas development accelerated by the progress in key technologies:a case study of the Changning-Weiyuan national shale gas demonstration zone[J].Natural Gas Industry,2017,37(12):1-10.
[8]陈勉.我国深层岩石力学研究及在石油工程中的应用[J].岩石力学与工程学报,2004,23(14):2 455-2 462.CHEN Mian.Review of study on rock mechanics at great depth and its applications to petroleum engineering of China[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(14):2 455-2462.
[9]孙元伟,程远方,时凤霞,等.致密气藏压裂水平井产能分析及压裂优化设计[J].新疆石油地质,2018,39(6):727-731.SUN Yuanwei,CHENG Yuanfang,SHI Fengxia,et al.Productivity analysis and fracturing design optimization of fractured horizontal well in tight gas reservoirs[J].Xinjiang Petroleum Geology,2018,39(6):727-731.
[10]XIONG H,WU W,GAO S.Optimizing well completion design and well spacing with integration of advanced multi-stage fracture modeling&reservoir simulation-a Permian basin case study[R].SPE 189855,2018.
[11]RICHTER K.Midland basin wolfcamp shale:completions observations and lateral length optimization[R].URTEC 665631-MS,2017.
[12]LOLON E,HAMIDIEH K,WEIJERS L,et al.Evaluating the relationship between well parameters and production using multivariate statistical models:a Middle Bakken and Three Forks case history[R].SPE 179171,2016.
[13]CADOTTE R J,WHITSETT A,SORRELL M,et al.Modern completion optimization in the Haynesville shale[R].SPE 187315,2017.