收稿日期: 2015-03-27
修回日期: 2015-06-17
网络出版日期: 2015-12-10
基金资助
国家重点基础研究发展计划(“973”计划)(编号:2014CB239103);长江学者和创新团队发展计划(编号:IRT1294);山东省自然科学基金(编号:ZR2014EL014)联合资助.
Study on Flow Characteristics of Multiple Coupled Model in Shale Gas Reservoirs
Received date: 2015-03-27
Revised date: 2015-06-17
Online published: 2015-12-10
气体在页岩储层中运移受解吸、扩散及渗流多种机制共同作用,同时也受储层的应力敏感效应等因素影响。综合考虑解吸、扩散及应力敏感效应,基于线性流模型,构建了符合页岩储层改造特点及流体渗流特征的分段压裂水平井多重复合流动模型。利用Laplace变换和Stehfest数值反演,得到封闭边界定产量下无因次井底拟压力和无因次产量半解析解。研究了页岩气在基质—微裂缝—压裂缝多重孔隙介质的复合流动,认识流体特性参数与压裂缝网参数对产气量的影响规律,并利用北美页岩气井生产数据进行拟合,验证了模型可靠性。研究结果表明:吸附气的解吸扩散使井底压力响应曲线出现明显“下凹”阶段;解吸系数增大,解吸气量越大,气井日产气量越高;窜流系数越大,基质与裂缝间的流体交换时间越早,但持续时间越短;压裂改造体积大,储层流体流动性强,但存在最优值;对比拟合结果,考虑改造带宽有限性更符合矿场实际。研究结果旨在为页岩储层分段压裂水平井多重复合流动规律研究提供理论基础。
苏玉亮,张琪,张敏,王文东 . 页岩气多重复合模型流动规律研究[J]. 天然气地球科学, 2015 , 26(12) : 2388 -2394 . DOI: 10.11764/j.issn.1672-1926.2015.12.2388
Gas flow in shale reservoir is affected by the interaction of desorption,diffusion,seepage mechanisms and formation stress sensitivity.Based on the trilinear model,a composite flow model for multistage fractured horizontal well was established with consideration of multiple mechanisms,which can reflect the characteristics of stimulation and fluid flow in shale gas reservoirs.Applying Laplace transform and Stehfest numerical inversion,the semi-analytical solutions of non-dimensional bottom-hole pseudo-pressure and productivity in closed reservoir were obtained.The analysis of gas flow in multi-scale porosity and the effects of different factors on productivity were carried out.The presented model was validated by the production data of gas well in North America.The results show that gas adsorption results in an obvious “dip” in pressure response curves.The larger desorption coefficient is,the higher desorption gas and production are.The larger channeling factor is,the earlier fluid exchange between matrix and fracture appears but the shorter it lasts.Larger stimulated volume would increase formation conductivity,while an optimistic value exists due to the fractures interference.The limited stimulated bandwidth are more accord with the practice by comparing matching results.The presented model and results enrich the pressure and rate analysis model for the multistage fractured horizontal wells in shale reservoirs.
[1]Wang Weifeng,Liu Peng,Chen Chen,et al.The study of shale gas reservoir theory and resources evaluation[J].Natural Gas Geoscience,2013,24(3):429-438.[王伟峰,刘鹏,陈晨,等.页岩气藏理论及资源评价方法[J].天然气地球科学,2013,24(3):429-438.]
[2]Xiao Gang,Tang Ying.Shale Gas and its Exploration and Development[M].Beijing:Higher Education Press,2012:25-53,139.[肖刚,唐颖.页岩气及其勘探开发[M].北京:高等教育出版社,2012:25-53,139.]
[3]Zhao Jin,Zhang Suian,Cao Lihu.Comparison of experimental adsorption between shale gas and coalbed gas[J].Natural Gas Geoscience,2012,24(1):176-181.[赵金,张隧安,曹立虎.页岩气与煤层气吸附特征对比试验研究[J].天然气地球科学,2013,24(1):176-181.]
[4]Yao Jun,Sun Hai,Fan Dongyan,et al.Transport mechanisms and numerical simulation of shale gas reservoirs[J].Journal of China University of Petroleum:Edition of Natural Science,2013,37(1):91-98.[姚军,孙海,樊东艳,等.页岩气藏运移机制及数值模拟[J].中国石油大学学报:自然科学版,2013,37(1):91-98.]
[5]Jiang Ruizhong,Wang Yang,Jia Junfei,et al.The new model for matrix and fracture permeability in shale reservoir[J].Natural Gas Geoscience,2014,25(6):934-939.[姜瑞忠,汪洋,贾俊飞,等.页岩储层基质和裂缝渗透率新模型研究[J].天然气地球科学,2014,25(6):934-939.]
[6]Yao Jun,Sun Hai,Huang Chaoqin,et al.Key mechanical problems in the development of shale gas reservoirs[J].Scientia Sinica:Physica,Mechanica & Astronomica,2013,43(12):1527-1547.[姚军,孙海,黄朝琴,等.页岩气藏开发中的关键力学问题[J].中国科学:物理学·力学·天文学,2013,43(12):1527-1547.]
[7]Li Qinghui,Chen Mian,Jin Yan,et al.Rock mechanical properties and brittleness evaluation of shale gas reservoir[J].Petroleum Drilling Techniques,2012,40(4):17-22.[李庆辉,陈勉,金衍,等.页岩气储层岩石力学特性及脆性评价[J].石油钻探技术,2012,40(4):17-22.]
[8]Gao Chao,Lee W J,Spivey P J,et al.Modeling Multilayer Gas Reservoirs Including Sorption Effects[R].SPE 29173.Presented at the SPE Eastern Regional Conference and Exhibition,8-10 November,Charleston,West Virginia,1994.
[9]Duan Yonggang,Wei Mingqiang,Li Jianqiu,et al.Shale gas seepage mechanism and fractured wells′ production evaluation[J].Journal of Chongqing University,2011,34(4):62-66.[段永刚,魏明强,李建秋,等.页岩气藏渗流机理及压裂井产能评价[J].重庆大学学报,2011,34(4):62-66.]
[10]Ozkan E,Raghavan R,Apaydin O.Modeling of Fluid Transfer from Shale Matrix to Fracture Network[R].SPE 134830.Presented at the SPE Annual Technical Conference and Exhibition,19-22 September,Florence,Italy,2010.
[11]Brown M,Ozkan E,Raghavan R,et al.Practical solutions for pressure-transient responses of fractured horizontal wells in unconventional shale reservoirs[J].SPE Reservoir Evaluation & Engineering,2011,14(6):663-676.
[12]Gao Jie,Zhang Liehui,Liu Qiguo,et al.Well test model of trilinear flow for fractured horizontal wells in shale gas reservoirs[J].Chinese Journal of Hydrodynamics:Series A,2014,29(1):108-113.[高杰,张烈辉,刘启国,等.页岩气藏压裂水平井三线性流试井模型研究[J].水动力学研究与进展:A 辑,2014,29(1):108-113.]
[13]Sang Yu,Chen Hao,Yang Shenglai,et al.A new mathematical model considering adsorption and desorption process for productivity prediction of volume fractured horizontal wells in shale gas reservoirs[J].Journal of Natural Gas Science and Engineering,2014,19(1):228-236.
[14]Stalgorova E,Mattar L.Analytical Model for History Matching and Forecasting Production in Multi-frac Composite Systems[R].SPE 162516.SPE Canadian Unconventional Resources Conference,30 October-1 November Calgary,Canada,2012.
[15]Su Yuliang,Wang Wendong,Sheng Guanglong.Compound flow model of volume fractured horizontal well[J].Acta Petrolei Sinica,2014,35(3):504-510.[苏玉亮,王文东,盛广龙.体积压裂水平井复合流动模型[J].石油学报,2014,35(3):504-510.]
[16]Wang Zhiping,Ran Bo,Tong Min,et al.New forecasting of fractured horizontal well productivity in dual permeability layers in volcanic gas reservoirs[J].Petroleum Exploration and Development,2014,41(5):585-590.[王志平,冉博,童敏,等.双孔双渗火山岩气藏裸眼压裂水平井产能预测方法[J].石油勘探与开发,2014,41(5):585-590.]
[17]Guo Jingjing,Zhang Liehui,Wang Haitao,et al.Pressure transientanalysis for multi-stage horizontal wells in shale gas reservoirs[J].Transport in Porous Media,2012,93(3):635-653.
[18]Wei Zichao,Qi Diansheng,Sun Zhaoxu,et al.Application of fracturing technology in low pore volume density reservoir[J].Well Testing,2013,22(4):50-52.[魏子超,綦殿生,孙兆旭,等.体积压裂技术在低孔致密油藏的应用[J].油气井测试,2013,22(4):50-52.]
[19]Lewis A M,Hughes R G.Production Data Analysis of Shale Gas Reservoirs[C].SPE 116688.SPE Annual Technical Conference and Exhibition,21-24 September,Denver,Colorado,USA,2008.
[20]Xu Bingxiang,Li Xiangfang,Haghighi M,et al.Production data analysis and productivity forecast of shale gas reservoir[J].Journal of China University of Petroleum:Edition of Natural Science,2013,37(3):119-125.[徐兵祥,李相方,Haghighi M,等.页岩气产量数据分析方法及产能预测[J].中国石油大学学报:自然科学版,2013,37(3):119-125.]
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