非牛顿幂律流体试井模型的有效半径解及其曲线特征  

Effective Wellbore Radius and Typical Curve Characteristics of Well Test Analysis:Non-Newtonian Power-law Fluids

作　　者：梁光跃[1] 廖新维[1] 万光芬[2] 廖红梅[3] 

机构地区：[1]中国石油大学(北京)石油工程学院,北京102249 [2]中国石油大学(北京)机电工程学院,北京102249 [3]中国石油天然气股份有限公司长庆油田分公司苏里格气田研究中心,西安710003

出　　处：《科技导报》2010年第13期58-61,共4页Science & Technology Review

基　　金：国家重点基础研究发展计划(973计划)项目(2005CB221304);教育部2008年度新世纪优秀人才支持计划

摘　　要：在实际油藏的三元复合驱条件下,三元复合体系多表现出非牛顿幂律流体的渗流特征。将三元复合体系假定为非牛顿幂律流体,建立了考虑井筒储集与表皮效应的无限大、圆形定压、封闭3种外边界条件下的非牛顿幂律流体均质试井模型;通过引入有效半径等的无量纲定义,利用组合参数的方法,求得了Laplace空间中的有效半径解,进一步对井筒储集早期段和径向流晚期段进行了简化,求得了相应的解析式,绘制了理论图版,对曲线形态进行了进一步分析。分析结果表明,均质模型试井曲线早期阶段受井筒存储系数、表皮系数组合参数的影响,径向流段受幂律指数的影响。该模型可以为三元复合驱试井测试资料分析提供理论基础。Among numerous tertiary recovery technologies, Alkaline-Surfactant-Polymer （ASP） flooding is one of the most important Enhanced Oil Recovery （EOR） methods. In this method, the ASP solution system exhibits the characteristics of non-Newtonian power-law fluid. A well test model with consideration of storage and skin effects is established in this paper based on non-Newtonian power-law fluid in infinite, constant pressure and no-flow circular boundary homogeneous reservoirs. The effective wellbore radius was obtained by introducing the dimensionless definitions of the effective wellbore radius and integrating parameters. Theoretical curves were obtained and further analyzed. In addition, the expressions of the early-time storage stage and the late-time radial flow phase were simplified, with two analytic solutions being derived by Laplace transformation. The results show that the early-time response stage is influenced by the combined parameter of storage and skin and the radial flow stage is affected by the power-law index for the homogeneous well test curve. The proposed model can provide a theoretical foundation for well test data analysis of ASP flooding.

关 键 词：非牛顿流 均质油藏 试井 有效半径解 典型曲线 

分 类 号：TE312[石油与天然气工程—油气田开发工程]