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《Natural Gas Geoscience》 2017-06
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Well testing analysis of multi-fractured horizontal well with unequal gas production of fractures in tight gas reservoir

Yan Jin;He You-wei;Shi Yun-qing;Zheng Rong-chen;Cheng Shi-qing;Yu Hai-yang;Li Ding-yi;SINOPEC Key Laboratory for Marine Oil and Gas Exploration;State Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum(Beijing);MOE Key Laboratory of Petroleum Engineering,China University of Petroleum(Beijing);  
Field-test data indicate that some fractures have little or no contribution to the total gas production.However,most well-testing models did not consider the effects of unequal gas production of fractures(UGPF)on well testing interpretation.Therefore,this paper establishes a well-testing model with consideration of UGPF based on the source function and Newman's product.Then,type curves of multi-fractured horizontal well(MFHW)with UGPF are developed through numerical algorithm to involve the effects of wellbore storage and skin factor.Sensitivity analysis(i.e.UGPF,fracture half-length,number of fractures,fracture spacing)are further discussed.There have big differences among well-testing type curves between equal gas production of fractures(EGPF)and UGPF.The early-radial flow behaves as a horizontal line with the value of nearly 0.5/N in the pseudo-pressure derivative curves when the interferences among fractures are tiny.Permeability of tight gas reservoir is very low so that the field-test data is hard to reflect the characteristics of pseudo-radial flow regime.If the early-radial flow regime is mistaken as the pseudo-radial flow regime,the interpreted permeability will be incorrect.Therefore,the effect of UGPF on well testing interpretation in tight gas reservoir should be investigated.Finally,this paper provides a method to estimate the parameters,which can be regarded as a reference for fracture performance evaluation.
【Fund】: 中国石化海相油气田开发重点实验室基金项目“致密气藏压裂井不均匀产气试井解释模型及方法研究”(编号:G5800-15-ZSWX057)资助
【CateGory Index】: TE373
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