摘要
针对低渗透变形介质砂岩油藏存在启动压力梯度和介质变形的特点,为了更加准确地预测其不同影响因素下的注水见效时间,以考虑启动压力梯度和介质变形系数的渗流公式为基础,建立非稳态渗流模型,通过反复迭代求解激动区域内平均地层压力,结合物质平衡法建立了低渗透变形介质砂岩油藏注水见效时间计算模型。注水见效时间主要受注采井距、激动区平均地层压力、介质变形系数和启动压力梯度影响。注采井距和激动半径增大,注水见效时间增加;启动压力梯度和介质变形系数越大,注水见效时间越长。
For the threshold pressure gradient and the medium deformation characteristic in low permeability deformed medium sandstone reservoirs, an unsteady-state seepage model, which could predict the flood response time under different affecting factors more accurately, is established on the basis of the flow formula considering threshold pressure gradient and media deformation factor. The average formation pressure in the excited area has been solved by using repeated iteration method. And, the water flooding response calculation model in low permeability deformed medium sandstone reservoirs has also been established according to material balance method. The water flooding response is mainly affected by the well spacing, the average formation pressure in the excited region, the threshold pressure gradient and the media deformation factor. The flood response time sharply increases with the increase of well spacing or excited radius and the increase of water flooding response is getting faster with well spacing's increment. The threshold pressure gradient or the media deformation factor greatly affects the water flooding response, and the greater the threshold pressure gradient or the media deformation factor, the longer the flood response time.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2013年第6期69-72,115,共4页
Petroleum Geology and Recovery Efficiency
基金
国家自然科学基金项目"深层高温高压油气藏多场耦合非线性渗流研究"(50574059)
关键词
低渗透砂岩油藏
变形介质
启动压力梯度
激动半径
注水见效时间
low permeability sandstone reservoir
deformed media
threshold pressure gradient
excited radius
flood response time
作者简介
雷刚,男,在读博士研究生,从事油气田开发工程方面的研究.联系电话：15011314843,E-mail：leigang5000@126.com.
