低渗透油藏变渗透率非达西试井模型  

Permeability-variable non-Darcy well test model of low-permeability reservoir

作　　者：刘斌 兰卫星 万芬 张雷 刘春艳 LIU Bin;LAN Weixing;WAN Fen;ZHANG Lei;LIU Chunyan(Tianjin Branch of CNOOC(China)Limited,Tianjin 300459,China;PetroChina Liaohe Oilfield Company,Panjin,Liaoning 124010,China;CNOOC EnerTech-Drilling&Production Co.,Tianjin 300452,China)

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300459 [2]中石油辽河油田分公司,辽宁盘锦124010 [3]中海油能源发展股份有限公司工程技术分公司,天津300452

出　　处：《油气井测试》2022年第2期1-6,共6页Well Testing

基　　金：“十三五”国家科技重大专项“渤海油田高效开发示范工程”(2016ZX05058)。

摘　　要：为建立与实际非线性渗流一致的试井解释模型,在考虑低渗透油藏变渗透率渗流效应的基础上,建立了二维低渗透油藏变渗透率非达西试井模型,给出了差分方程组数值求解方法,绘制了考虑不渗透边界影响的试井典型曲线,进行了不渗透边界与低速非达西对低渗透油藏试井曲线的敏感性分析。研究结果表明,对于非达西流动情形,压力导数曲线在径向流动阶段便开始偏离0.5水平线而逐渐上翘,非达西作用越强,上翘幅度越大,在遇到不渗透边界后上翘幅度加快;对于低渗透油藏,井附近存在不渗透边界时,非达西流动有可能掩盖不渗透边界的影响。该模型可以有效的解决低渗透油藏试井曲线非达西上翘与不渗透边界上翘难以区分的问题,对低渗透油藏的试井解释具有较大的实用意义。In order to establish a well test model consistent with actual nonlinear flow pattern,considering the permeability-variable flow effect of low-permeability reservoir,a two-dimensional permeability-variable non-Darcy well test model of low-permeability reservoir was established,the numerical solution method of difference equations was given,the well test type curve considering the influence of impermeable boundary was plotted,and the sensitivity of impermeable boundary and low-velocity non-Darcy flow to the well test curve of low-permeability reservoir was analyzed.The results show that for non-Darcy flow,the pressure derivative curve begins to deviate from the 0.5 horizontal line and gradually warps upward in the radial flow stage.The stronger the non-Darcy effect,the greater the warping amplitude;the warping is faster after reaching the impermeable boundary.For low-permeability reservoirs,when there is an impermeable boundary near the wellbore,non-Darcy flow may cover up the influence of the impermeable boundary.The model proposed can help effectively distinguish between non-Darcy warping and impermeable boundary warping of well test curve of low-permeability reservoirs,and has great practical significance for well test interpretation of low-permeability reservoirs.

关 键 词：低渗透油藏 试井解释模型 非达西流动 变渗透率 不渗透边界 试井解释曲线 径向流动 

分 类 号：TE353[石油与天然气工程—油气田开发工程]