低渗透油藏通用非达西渗流模型及压力曲线特征  

COMMON NON-DARCY FLOW MODEL AND CHARACTERISTICS OF PRESSURE CURVES OF LOW-PERMEABILITY OIL RESERVOIRS

作　　者：郑春峰[1] 程时清[1] 李冬瑶[1] 

机构地区：[1]中国石油大学石油工程教育部重点实验室,北京102249

出　　处：《大庆石油地质与开发》2009年第4期60-63,共4页Petroleum Geology & Oilfield Development in Daqing

基　　金：基金项目：国家“863”基金项目“特殊结构井开发油藏工程技术”（合同编号：2006AA092338）资助.

摘　　要：研究表明低渗透油藏渗流规律不符合达西定律。根据学者在低渗透非达西多相渗流的数值模拟分析中提出的渗流速度和压力梯度关系，进一步提出了变渗透率效应概念，建立了低渗透油藏通用非达西渗流试井模型，采用追赶法对变渗透率效应差分方程组迭代求解。对渗透率取几何平均数，解决了迭代求解过程中解的振荡不收敛问题。计算结果表明：变渗透率效应持续时间越短，压力曲线及压力导数曲线上翘越大。基于变渗透率效应建立的通用非达西渗流试井模型及其求解的方法比目前动边界计算方法稳定性更好，比较符合实际情况。达西渗流试井模型只是低渗透油藏通用非达西渗流试井模型的特例。It has been proved by studies that the flow regularity in low-permeability oil reservoirs does not comply with the Darcy＇s law. According to the numerical simulations of low-permeability non-Darcy multi-phase porous flow that performed by other researchers, as well as considering the relation between the flow rate and the pressure gradient determined in these numerical simulations, the related calculating methods for the numerical simulations have been developed. Based on the above, a concept of changing permeability effect has been proposed in the essay and a common non-Darcy flow well testing model for low-permeability oil reservoirs has been set up. Pursuit method has been adopted to realize interactive solution of different equations of changing permeability effect. The geometric mean of the permeability has been calculated to solve the misconvergence during interactive solution. The calculation results show that the less time changing permeability effect lasts, the steeper the pressure curve and its derivative curve move upward. The stability of common non-Darcy flow ,sell testing model and its solution based on the effect is better than moving boundary model. The common non-Darcy flow well testing model is also more adequate to solve practical problems. In addition, the Darcy flow model is just a peculiar example of the common non-Darcy flow well testing model for low-permeability oil reservoirs.

关 键 词：低渗透油藏 非达西渗流 试井 变渗透率效应 典型曲线 

分 类 号：TE312[石油与天然气工程—油气田开发工程]