非均匀体积压裂水平井压力动态分析  

Pressure transient analysis of non-uniform multifractured horizontal wells

作　　者：孟凡嵩 尹洪军 袁鸿飞[1,2] 付京 代立 Fan-song Meng;Hong-jun Yin;Hong-fei Yuan;Jing Fu;Li Dai(College of Petroleum Engineering,Northeast Petroleum University,Daqing 163318,China;Key Laboratory of Enhanced Oil Recovery(Northeast Petroleum University),Ministry of Education,Daqing 163318,China;Colorado School of Mines,Golden Colorado 80401,USA)

机构地区：[1]东北石油大学石油工程学院,大庆163318 [2]提高油气采收率教育部重点实验室(东北石油大学),大庆163318 [3]Colorado School of Mines,Golden Colorado 80401,USA

出　　处：《水动力学研究与进展（A辑）》2022年第1期28-34,共7页Chinese Journal of Hydrodynamics

基　　金：国家科技重大专项(2017ZX05071005)。

摘　　要：针对缝间非均质性及裂缝长度分布非均匀问题,区分端部裂缝和中部裂缝,分别建立不同区域的渗流数学模型,利用Laplace变换和Stehfest数值反演得到井底压力解,绘制分析压力动态曲线。结果表明:该模型的流动形态可分为7个主要阶段;裂缝总长一定,裂缝长度非均匀分布时,短裂缝数量较多,压力传播率先到达未改造区,压力损失较大,压力和压力导数曲线靠上;缝间非均质性越强,改造区渗透率小于均值的裂缝越多,压力在裂缝间传播时消耗的压降就越大。对一口实测井的试井资料进行了解释,得到了该井储层及裂缝参数。研究结果可为非均匀体积压裂水平井试井解释和压力动态分析提供依据。In the view of the problems of heterogeneity between fractures,uneven length and distribution of fractures,the end fractures and the middle fractures are distinguished,and the porous flow mathematical models in different regions are established.Laplace transformation and Stehfest inversion are used to obtain the bottom-hole pressure,then the pressure transient curves are drawn and analyzed.The results show that there are seven main periods of the model.If the total length of fractures is fixed and the fracture length is not uniformly distributed,there are more short fractures.The pressure propagation reaches the unstimulated reservoir first,the consumption of pressure is relatively larger,and the pressure and pressure derivative curves are higher.The stronger the heterogeneity between fractures,the more fractures whose permeability in the stimulated reservoir is less than the average value,and the greater the pressure drop consumed when the pressure propagates between the fractures.The well test data of an measured well are interpreted to obtain the reservoir a nd fracture properties.The results can provide scientific basis for the well test interpretation and pressure transient analysis of non-uniform multifractured horizontal wells.

关 键 词：体积压裂 水平井 非均匀 缝间非均质性 压力动态分析 

分 类 号：TE357[石油与天然气工程—油气田开发工程]