弱底水碳酸盐岩礁相气藏压裂井试井模型研究  

Fractured Well Test Model of Carbonate Reef Gas Reservoir with Weak Bottom-Aquifer

作　　者：张文昌[1] 王海涛[2,3] Zhang Wenchang;Wang Haitao(Sinopec Zhongyuan Oilfield Company,Puyang,Henan 457001,China;Southwest Petroleum University,Chengdu,Sichuan 610500,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu,Sichuan 610500,China)

机构地区：[1]中国石化中原油田分公司,河南濮阳457001 [2]西南石油大学,四川成都610500 [3]油气藏地质与开发工程国家重点实验室,四川成都610500

出　　处：《特种油气藏》2020年第3期93-98,共6页Special Oil & Gas Reservoirs

基　　金：国家自然科学基金“基于高精度边界元法的多尺度多机制复杂缝网页岩气藏压裂水平井动态模拟”(51774243);国家科技重大专项“长宁-威远页岩气开发示范工程”(2016ZX05062)。

摘　　要：碳酸盐岩礁相气藏常常具有多重孔隙介质特征及弱底水相伴特征,目前基于解析或半解析法的试井模型很难对其进行合理描述。针对该问题,运用渗流力学、数学物理方法、数值分析等多学科方法,建立了碳酸盐岩礁相气藏压裂井试井模型,借助数学方法在Laplace空间对模型成功实现了解析求解,并利用Stehfest反演和计算机编程,绘制出了井底压力的双对数曲线。研究结果表明:碳酸盐岩礁相气藏压裂井试井曲线最多可能出现10个典型渗流阶段。其中,导数曲线上的2个"凹子"和晚期边界反映段下掉变缓是礁相气藏多重介质孔隙特征和弱底水特征的反映。研究成果对弱底水碳酸盐岩礁相气藏压裂井的试井问题提供了理论支撑,对此类气藏的试井分析具有重要的理论和现实意义。Carbonate reef gas reservoir is usually characterized by multiple porous media and weak bottom-aquifer,which partly limits the application of well test model based on analytical or semi-analytical methods.Seepage mechanics,mathematical physics,numerical analysis and other multi-disciplinary means were used to establish a fracture well test model for carbonate reef gas reservoir.The model was successfully solved by mathematical method in Laplace space.Research indicates that the fractured well test curve in carbonate reef gas reservoir can be maximally divided into 10 seepage sections.The properties of multiple porous media and weak aquifer can be characterized by the two“concave”sections and late boundary-dominated flow section.This research could provide certain theoretical reference for the fractured well test interpretation of carbonate reef gas reservoir with weak bottom-aquifer,and could also lay an important technical and practical significance for the well test analysis of similar gas reservoirs.

关 键 词：弱底水 碳酸盐岩 礁相气藏 压裂井 试井 渗流模型 

分 类 号：TE353[石油与天然气工程—油气田开发工程]