考虑滑脱效应的低渗透气藏气-水两相渗流数值模拟器  

Gas-Water Flow Digital Simulator for Low Permeability Gas Reservoir with Slippage Effect

作　　者：严文德[1] 郭肖[1] 贾英[1] 

机构地区：[1]西南石油学院油气藏地质及开发工程国家重点实验室,四川新都610500

出　　处：《新疆石油地质》2005年第2期186-188,共3页Xinjiang Petroleum Geology

摘　　要：低渗透气藏普遍具有低孔、低渗、高含水饱和度的特点,气体渗流存在明显的滑脱效应。Klinkenberg在1941年提出了气体在不含束缚水多孔介质中渗流时出现滑脱现象,而且岩石越致密,渗透率越低,滑脱效应越明显。目前对低渗透气藏的数值模拟研究仍采用常规气藏模型,导致预测开发指标与实际存在较大的差异。通过对低渗透气藏渗流机理的分析,建立了低渗透气藏气-水两相流动非线性渗流数学模型,同时引入考虑滑脱效应的气相相对渗透率概念,建立了相应的数值模型和模拟模型,并根据所建数学模型及其数值解法,编制了考虑气体滑脱效应的低渗透气藏气-水两相渗流数值模拟器。Low permeability gas reservoir is normally characterized by low porosity, low permeability and high water saturation, and the existence of slippage effect is obviously found in gas flowing through porous media without irreducible water. The tighter the rock, the lower the permeability, and the more obvious the slippage effect is. However, common gas reservoir model is never the less used for numerical simulation study of low-permeability gas reservoir, which leads to more differences between development indices predicted and real ones. The mechanism of percolation in low-permeability gas reservoir is analyzed. The nonlinear percolation mathematic model to both gas and water is then developed. Furthermore, the related numerical and simulation models and simulator are established, considering the concept of gas relative permeability with the slippage effect.

关 键 词：低渗透气藏 两相渗流 高含水 开发指标 相对渗透率 渗流机理 非线性渗流 效应 编制 预测 

分 类 号：TE312[石油与天然气工程—油气田开发工程] TE373