深层高产碳酸盐岩油藏试井解释模型及其应用  

Well test model and its application in deep high-yield carbonate reservoir

作　　者：金子一 贾品[1] 程林松[1] 张向阳 孙兆乐 胡江鹏 JIN Zi-yi;JIA Pin;CHENG Lin-song;ZHANG Xiang-yang;SUN Zhao-le;HU Jiang-peng(College of Petroleum Engineering,China University of Petroleum(Beijing),Beijing 102249,China)

机构地区：[1]中国石油大学(北京)石油工程学院,北京102249

出　　处：《陕西科技大学学报》2022年第6期108-115,共8页Journal of Shaanxi University of Science & Technology

基　　金：国家自然科学基金项目(52004307);中国石油科技项目-重大项目(ZLZX2020-02-04);中国石油大学(北京)科研基金资助项目(2462018YJRC015)。

摘　　要：深层高产碳酸盐岩油藏由于储层非均质性导致储层类型差异明显,往往包括孔隙、裂缝等储集空间.此外,该类油藏存在大埋藏深度带来的强应力敏感和高产量、高流速造成的高速非达西,给试井解释及储层参数反演带来了挑战.聚焦于深层高产碳酸盐岩油藏,分别引入拟压力和表皮系数考虑强应力敏感和高速非达西效应两大特征,建立了裂缝孔隙双重介质试井模型,通过无因次化和拉氏变换得到了拉氏空间下的数学模型,求得井底压力解析解并绘制了压力响应样板曲线,明确了曲线6个流动阶段及敏感性分析.结果表明:在应力敏感作用影响下,压力导数曲线上移,且应力敏感愈强,曲线上翘幅度越大;此外,产量越高,表皮系数越大,附加压降越大,压力及压力导数曲线位置越高.基于T油田某实例井生产动态反演得到应力敏感系数0.027、高速非达西表皮系数2.61等关键参数,反映生产现场关井前的产量较大,储层应力敏感效应较强.现场应用实例拟合结果进一步证明了模型的准确性与实用性.Due to the heterogeneity of the reservoir,the deep high-yield carbonate reservoirs have obvious differences in reservoir types,which often include pores and fractures.In addition,the reservoirs have strong stress sensitivity caused by large burial depth and high-velocity non-Darcy flow caused by high production and flow rate,which brings challenges to well test and reservoir parameter inversion.In this paper,focusing on the deep high-yield carbonate reservoirs,the pseudo-pressure and the skin coefficient were introduced respectively,considering the two characteristics of strong stress sensitivity and high-velocity non-Darcy flow,and the fracture-pore dual medium well test model was established.The mathematical model in the Laplace space was obtained by the transformation,the analytical solution of the bottom hole pressure was obtained,the pressure response model curve was drawn,and the six flow stages of the curve and the sensitivity analysis were defined.The results show that:under the influence of stress sensitivity,the pressure derivative curve moves upward,and the stronger the stress sensitivity is,the greater the upturn of the curve.In addition,the higher the production,the greater the skin factor,the greater the additional pressure drop,and the higher the position of the pressure and pressure derivative curves.Main parameters such as stress sensitivity coefficient 0.027 and high-velocity non-Darcy flow pseudo skin factor 2.61 were obtained by inversion based on the production performance of a tested well in T Oilfield,reflecting that the production before shut-in was relatively large and the reservoir stress sensitive effect was strong.The fitting results of field application further proved the accuracy and practicability of the model.

关 键 词：深层高产碳酸盐岩 表皮系数 强应力敏感 拟压力 

分 类 号：TE353[石油与天然气工程—油气田开发工程]