宾汉流体稠油非稳态渗流时地层压力分布数学模型及直井产能预测  

A Mathematical Model of Stratum Pressure Distribution in Heavy-Oil Reservoir with Non-Steady State Bingham Fluid and Productivity Prediction in Vertical Wells

作　　者：何勇明[1] 王允诚[1] 姜淑霞[2] 郭子义[3] 

机构地区：[1]成都理工大学油气藏地质及开发工程国家重点实验室,四川成都610059 [2]中原油田勘探开发研究院,河南濮阳457001 [3]青海油田钻采院,甘肃敦煌736202

出　　处：《石油钻探技术》2006年第1期56-58,共3页Petroleum Drilling Techniques

摘　　要：稠油在地层中的流动具有非牛顿流体特性。将稠油视为宾汉流体,推导了宾汉流体在非稳态状况时地层孔隙中的压力分布数学模型,并求得了数值解。分析了宾汉流体的启动压力梯度对地层压力分布的影响。基于启动压力梯度,考虑宾汉流体的运动半径和运动边界压力,推导了稠油油藏直井的产能预测公式,给出了运动半径和运动边界压力的确定方法,并与普通油藏的直井产能预测公式相比较,结果表明,稠油的非牛顿流动特性对产能预测结果具有一定的影响。When flowing in the formation heavy oil always reveals non-Newton rheological behavior. Assuming heavy oil as Bingham fluid, a mathematic model of non-steady pressure distribution of Bingham fluid in formation pores is derived, and its numerical solution is obtained. In addition, the effect of startup pressure gradient of Bingham fluid in stratum pressure distribution are analyzed. Based on the startup pressure gradient and accounting for aspects of moving radius and moving boundary pressures, productivity prediction equations of heavy oil reservoirs in vertical wells are derived, methods for calculating moving radius and moving boundary pressures are presented also. Comparisons of the productivity-predlction equations with conventional vertical well ones show that non-Newton flow behavior of heavy oil affects productivity prediction to a certain extent.

关 键 词：直井 稠油 启动压力 产能预测 数学模型 

分 类 号：TE312[石油与天然气工程—油气田开发工程]