特低渗透油藏多层合采水驱前缘  

Water-oil frontal edge for multilayer commingled production in ultra-low permeability reservoirs

作　　者：徐庆岩[1] 蒋文文[2] 何英[3] 齐亚东[1] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国专利信息中心,北京100088 [3]中国石油勘探开发研究院廊坊分院,河北廊坊065007

出　　处：《辽宁工程技术大学学报（自然科学版）》2014年第8期1048-1052,共5页Journal of Liaoning Technical University (Natural Science)

基　　金：国家油气重大专项课题基金资助项目(2011ZX0513-006)

摘　　要：针对特低渗透油藏多层合采时各层注水推进速度差异较大的问题,为准确计算各层水驱前缘的位置,利用特低渗透油藏渗流理论,建立理论模型,推导了考虑油相非线性渗流特征的水驱前缘的计算公式,分析了渗透率级差、注采井距、非线性渗流特征对水驱前缘的影响.结果表明:储层渗透率越小,水驱前缘距注水井的距离越小,且考虑非线性渗流特征计算出的水驱前缘更小;注采井距越大,水驱前缘位置与注水井距离变大,但是无因次水驱前缘变小,而不考虑非线性的无因次水驱前缘保持不变,反映出非线性渗流特征使油藏开发效果变差.Aiming at the issue of advancing velocity difference of each stratum during the commingled production for the ultra-low permeability multilayer reservoir, in order to calculate the water-oil frontal edge position precisely, theoretical model was established and the calculation formula of water-oil frontal edge considering nonlinear seepage feature for reservoir oil was deduced on the basis seepage theory of ultra-low permeability reservoir. In addition, the influence of permeability differential, injection-production well spacing and nonlinear seepage characteristic on the water-oil frontal edge was also analyzed. The results show that： while the reservoir permeability is smaller, the distance between water-oil frontal edge and injection well is much shorter and the advancing velocity of water-oil frontal edge is becoming slower moreover the distance between water-oil frontal edge and injection well considering nonlinear seepage characteristic is shorter than that without considering nonlinear seepage characteristic; under the same permeability ratio, with the increase of the injection-production well spacing, although the distance between water-oil frontal edge and injection well in the layer with smaller permeability is bigger, the dimensionless water-oil frontal edge is becoming smaller; whereas the dimensionless water-oil frontal edge without regard to nonlinear seepage feature remains unchanged, which reflects that nonlinear seepage characteristic makes the reservoir development worse.

关 键 词：特低渗透 多层油藏 水驱前缘 非线性渗流 注采井距 

分 类 号：TE348[石油与天然气工程—油气田开发工程]