Prediction of decline in shale gas well production using stable carbon isotope technique

查看全文 作　　者：Shengxian [1,2,4]ZHAO;Shujuan [3]KANG;Majia [4]ZHENG;Shuangfang [1,2]LU;Yunfeng [5]YANG;Huanxu [5]ZHANG;Yongyang [4]LIU;Ziqiang [4]XIA;Chenglin [4]ZHANG;Haoran [4]HU;Di [5]ZHU

机构地区：[1]Key Laboratory of Deep Oil and Gas,China University of Petroleum(East China),Qingdao 266580,China;[2]School of Geosciences,China University of Petroleum(East China),Qingdao 266580,China;[3]Key Laboratory of Earth and Planetary Physics,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;[4]Shale Gas Institute of PetroChina Southwest Oil&Gasfield Company,Chengdu 610000,China;[5]Suzhou Grand Energy Technology Ltd.,Suzhou 215129,China

出　　处：《Frontiers of Earth Science》索引2021年第15卷第4期,共11页

基　　金：supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDA14050201). 摘　　要：Prediction of shale gas production is a challenging task because of the complex fracture-pore networks and gas flow mechanisms in shale reservoirs.Empirical methods,which are used in the industry to forecast the future production of shale gas,have not been assessed sufficiently to warrant high confidence in their results.Methane carbon isotopic signals have been used for producing gas wells,and are controlled by physical properties and physics-controlling production;they serve as a unique indicator of the gas production status.Here,a workable process,which is combined with a gas isotope interpretation tool(also known as a numerical simulator),has been implemented in Longrnaxi shale gas wells to predict the production decline curves.The numerical simulator,which takes into account a convection-diffu-sion-adsorption model for the matrix and a convection model for fractures in^(13)CH_(4) and ^(12)CH_(4) isotopologues,was used to stabilize the carbon isotope variation in the produced gas to elucidate gas recovery.Combined with the production rates of the four developing wells,the total reserves ranged from 1.72×10^(8) to 2.02×10^(8) m^(3),which were used to constrain the trend of two-segment produc-tion decline curves that exhibited a transition from a hyperbolic equation to an exponential one within 0.82-0.89 year.Two-segment production decline curves were used to forecast future production and estimate ultimate recovery. 关键词：shale gas production decline Longmaxi formation carbon isotope

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Prediction of decline in shale gas well production using stable carbon isotope technique

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