涪陵页岩气田压裂后闷井工艺适应性初探
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摘要
利用X射线衍射、扫描电镜,结合自发渗吸、核磁共振实验,研究了涪陵页岩气储层特性及其对压裂液渗吸和扩散的能力,探索了涪陵地区储层的渗吸及孔隙内部压裂液流动规律,评价了涪陵地区页岩气储层压裂后闷井的潜力,分析了储层物性对压裂后闷井效果的影响,并开展了压裂后闷井试验。结果表明:涪陵页岩气储层具有一定的压裂后闷井的潜力,压裂后闷井可有效降低试气阶段的压裂液返排量,增强储层与压裂液的相互作用,增加初期测试产量;层理和微裂隙发育程度、储层改造效果是影响闷井效果的关键因素,储层对压裂液的渗吸、扩散以及储层微裂隙的诱导是增强产能的关键机理。该研究结果可为其他地区开展压裂后闷井提供依据和参考。
X-ray diffraction and scanning electron microscopy are used to study the Fuling shale gas reservoir features and its imbibition and diffuse performances for fracturing fluid by combining with spontaneous imbibition and nuclear magnetic resonance. The reservoir imbibition and fracturing fluid flow patterns within the reservoir pores in Fuling were explored and the well-soaking potential after fracturing for shale gas reservoir is evaluated to analyze the effects of reservoir properties on well-soaking performance. In addition,a pilot test is carried out for well-soaking after fracturing. Result indicates that the Fuling shale gas reservoir presents certain potential for well-soaking after fracturing. Well-soaking after fracturing can significantly reduce the fracturing fluid flowback rate,enhance the interaction between reservoir and fracturing fluid and increase the initial test production. Well-soaking after fracturing is mainly dependent on the reservoir bedding and micro-crack development level and the reservoir stimulation performance. Fracturing fluid imbibition and diffusion and the induction of micro-fractures within shale gas reservoir are considered as the key mechanisms for productivity enhancement. This research could provide certain basis and reference for the implement of well-soaking after fracturing in similar areas.
X-ray diffraction and scanning electron microscopy are used to study the Fuling shale gas reservoir features and its imbibition and diffuse performances for fracturing fluid by combining with spontaneous imbibition and nuclear magnetic resonance. The reservoir imbibition and fracturing fluid flow patterns within the reservoir pores in Fuling were explored and the well-soaking potential after fracturing for shale gas reservoir is evaluated to analyze the effects of reservoir properties on well-soaking performance. In addition,a pilot test is carried out for well-soaking after fracturing. Result indicates that the Fuling shale gas reservoir presents certain potential for well-soaking after fracturing. Well-soaking after fracturing can significantly reduce the fracturing fluid flowback rate,enhance the interaction between reservoir and fracturing fluid and increase the initial test production. Well-soaking after fracturing is mainly dependent on the reservoir bedding and micro-crack development level and the reservoir stimulation performance. Fracturing fluid imbibition and diffusion and the induction of micro-fractures within shale gas reservoir are considered as the key mechanisms for productivity enhancement. This research could provide certain basis and reference for the implement of well-soaking after fracturing in similar areas.
引文
[1]杨柳,葛洪魁,程远方,等.页岩储层压裂液渗吸-离子扩散及其影响因素[J].中国海上油气,2016,28(4):94-99.
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[14]方朝合,黄志龙,王巧智,等.富含气页岩储层超低含水饱和度成因及意义[J].天然气地球科学,2014,25(3):471-476.
[15]DEHGHANPOUR H,LAN Q,SAEED Y,et al.Spontaneous imbibition of brine and oil in gas shales:effect of water adsorption and resulting microfractures[J].Energy&Fuels,2013,27(6):3039-3049.
[16]ZHOU Z,HOFFMAN B T,BEARINGER D,et al.Experimental and numerical study on spontaneous imbibition of fracturing fluids in shale gas formation[C].SPE171600-MS,2014:425-437.
[17]ROYCHAUDHURI B,TSOTSIS T,JESSEN K.An experimental investigation of spontaneous imbibition in gas shales[J].Journal of Petroleum Science&Engineering,2013,111(7):87-97.
[18]SHENG J.What type of surfactants should be used to enhance spontaneous imbibition in shale and tight reservoirs?[J].Journal of Petroleum Science&Engineering,2017,159(9):635-643.
[19]蔡建超,郁伯铭.多孔介质自发渗吸研究进展[J].力学进展,2012,42(6):735-754.
[20]LIU D,GE H,LIU J,et al.Experimental investigation on aqueous phase migration in unconventional gas reservoir rock samples by nuclear magnetic resonance[J].Journal of Natural Gas Science&Engineering,2016,36(2):837-851.
[21]MENG M,GE H,JI W,et al.Investigation on the variation of shale permeability with spontaneous imbibition time:sandstones and volcanic rocks as comparative study[J].Journal of Natural Gas Science&Engineering,2015,27(4):1546-1554.
[22]BOSTROM N,CHERTOV M,PAGELS M,et al.The time-dependent permeability damage caused by fracture fluid[C].SPE168140-MS,2014:41-58.
[2]GHANBARI E,DEHGHANPOUR H.Impact of rock fabric on water imbibition and salt diffusion in gas shales[J].International Journal of Coal Geology,2015,138(6):55-67.
[3]GHANBARI E,ABBASI M A,DEHGHANPOUR H,et al.Flowback volumetric and chemical analysis for evaluating load recovery and its impact on early-time production[C].SPE167165-MS,2013:21-37.
[4]韩慧芬,王良,贺秋云,等.页岩气井返排规律及控制参数优化[J].石油钻采工艺,2018,40(2):253-260.
[5]张寅,李世恩.涪陵页岩气井焖井时间与产能关系分析[J].江汉石油职工大学学报,2017,30(5):49-51.
[6]张涛,李相方,杨立峰,等.关井时机对页岩气井返排率和产能的影响[J].天然气工业,2017,37(8):48-60.
[7]康毅力,张晓怡,游利军,等.页岩气藏自然返排缓解水相圈闭损害实验研究[J].天然气地球科学,2017,28(6):819-827.
[8]DUTTA R,LEE C H,ODUMABO S,et al.Experimental investigation of fracturing-fluid migration caused by spontaneous imbibition in fractured low-permeability sands[J].SPE Reservoir Evaluation&Engineering,2014,17(1):74-81.
[9]薛永超,张雪娇,丁冠阳.页岩气井返排早期气水两相流数学模型研究[J].科学技术与工程,2017,17(24):213-217.
[10]朱维耀,马东旭.层理缝对页岩渗透率的影响及表征[J].特种油气藏,2018,25(2):130-133.
[11]高凤琳,宋岩,姜振学,等.黏土矿物对页岩储集空间及吸附能力的影响[J].特种油气藏,2017,24(3):1-8.
[12]赵金洲,许文俊,李勇明,等.页岩气储层可压性评价新方法[J].天然气地球科学,2015,26(6):1165-1172.
[13]盛秋红,李文成.泥页岩可压性评价方法及其在焦石坝地区的应用[J].地球物理学进展,2016,31(4):1473-1479.
[14]方朝合,黄志龙,王巧智,等.富含气页岩储层超低含水饱和度成因及意义[J].天然气地球科学,2014,25(3):471-476.
[15]DEHGHANPOUR H,LAN Q,SAEED Y,et al.Spontaneous imbibition of brine and oil in gas shales:effect of water adsorption and resulting microfractures[J].Energy&Fuels,2013,27(6):3039-3049.
[16]ZHOU Z,HOFFMAN B T,BEARINGER D,et al.Experimental and numerical study on spontaneous imbibition of fracturing fluids in shale gas formation[C].SPE171600-MS,2014:425-437.
[17]ROYCHAUDHURI B,TSOTSIS T,JESSEN K.An experimental investigation of spontaneous imbibition in gas shales[J].Journal of Petroleum Science&Engineering,2013,111(7):87-97.
[18]SHENG J.What type of surfactants should be used to enhance spontaneous imbibition in shale and tight reservoirs?[J].Journal of Petroleum Science&Engineering,2017,159(9):635-643.
[19]蔡建超,郁伯铭.多孔介质自发渗吸研究进展[J].力学进展,2012,42(6):735-754.
[20]LIU D,GE H,LIU J,et al.Experimental investigation on aqueous phase migration in unconventional gas reservoir rock samples by nuclear magnetic resonance[J].Journal of Natural Gas Science&Engineering,2016,36(2):837-851.
[21]MENG M,GE H,JI W,et al.Investigation on the variation of shale permeability with spontaneous imbibition time:sandstones and volcanic rocks as comparative study[J].Journal of Natural Gas Science&Engineering,2015,27(4):1546-1554.
[22]BOSTROM N,CHERTOV M,PAGELS M,et al.The time-dependent permeability damage caused by fracture fluid[C].SPE168140-MS,2014:41-58.