考虑动边界影响的低速非达西渗流数值试井  

Numerical Well Testing on Low Velocity and Non-Darcy Flow with Dynamic Boundary

作　　者：任胜利[1] 李敬松[1] 

机构地区：[1]中海油田服务股份有限公司,北京101149

出　　处：《油气井测试》2014年第3期9-12,75,共4页Well Testing

摘　　要：低渗透油藏往往出现低速非达西渗流,表现出启动压力梯度以及流体流动边界不断向外扩展等特殊现象。充分考虑启动压力梯度与动边界的影响,建立了低速非达西渗流有效井径试井的数学模型,对时间和空间变量进行离散化,求出其数值解,进一步分析了压力动态特征及影响因素,绘制了特征曲线,得到了动边界的传播规律。结果表明,启动压力梯度越大,动边界传播越慢。A large number of low-permeability core test results indicate that the liquid flow and the gas flow with a certain degree of water saturation have deviated from the Darcy flow in low-permeability reservoir,and often show low velocity and non-Darcy flow characteristics.Besides,the phenomenon of the threshold pressure gradient and flow boundary expanding appears. In this paper,a well test model of effective well-bore radius is presented in the slightly compressible reservoir; it fully considers the impact of the threshold pressure gradient and the dynamic boundary. The mathematic model is solved by numerical method which puts time and space variables into discrete.The pressure characteristics and influencing factors are studied. Characteristic curve and the diffuse rule of the dynamic boundary are gained and analyzed. It shows that the dynamic boundary outspreads slower while the threshold pressure gradient becomes greater.

关 键 词：动边界 非达西 数值试井 低渗透 启动压力梯度 特征曲线 

分 类 号：TE353[石油与天然气工程—油气田开发工程]