考虑二次压力梯度非线性渗流三区复合油藏模型分析  

Analysis of considering quadratic pressure gradient nonlinear percolation in 3-zone composite reservoir

作　　者：张林[1] 贾永禄[1] 张福祥[2] 杨向同[2] 秦世勇[2] 

机构地区：[1]西南石油大学油气藏地质与开发国家重点实验室,四川成都610500 [2]中国石油塔里木油田分公司,新疆库尔勒841000

出　　处：《大庆石油学院学报》2011年第5期54-59,117-118,共6页Journal of Daqing Petroleum Institute

基　　金：中国石油总天然气集团总公司重点工程攻关项目(971007110165)

摘　　要：对于复杂油藏,流体二次压力梯度非线性渗流力学理论更能准确反映油藏渗流规律,可以获得更为准确的油藏动态参数.建立考虑井筒储存效应、表皮效应的二次梯度三区复合模型,运用变量代换、拉普拉斯(Laplace)变换求取外边界条件为无穷大的拉氏空间解;通过Stehfest数值反演获得实空间解,利用计算机编程绘制样版曲线并进行敏感性分析,研究二次压力梯度渗流机理及特征.结果表明:新型非线性渗流模型压力和压力导数曲线与常规模型曲线相比存在偏移,1区压力导数不再遵循"0.5线"规则,三区复合油藏有6个渗流阶段.Quadratic pressure gradient nonlinear percolation theory can more truly reflect the flow rules for complex reservoir and fluid.Compared to conventional model,the quadratic gradient model may result in more accurate reservoir dynamic parameters.Based on this theory,considering the effect of wellbore storage and the skin effect,the nonlinear percolation model for 3-zone composite reservoir is established.Using variable substitution and Laplace transform,the Laplace space analytic solution under the infinite boundary is obtained.By Stehfest numerical inversion,the real space solution is also obtained.Using a computer programming,the corresponding sample curve is mapped.Sensitivity analysis,comparison with conventional model for the error analysis,the percolation mechanism and characteristics of pressure gradient are studied.The pressure and pressure derivative curve of the new nonlinear percolation model is different from conventional model curve,and the derivative curves of 1-zone don't conform to the rule of '0.5 line'.3-zone composite reservoir consists of 6 seepage stages.

关 键 词：非线性渗流 二次压力梯度 试井分析 三区复合油藏 拉普拉斯变换 

分 类 号：TE312[石油与天然气工程—油气田开发工程]