低渗透变形介质砂岩油藏注水见效时间及影响因素  

Water flooding response and its affecting factors in low permeability deformed medium sandstone reservoirs

作　　者：雷刚[1] 董平川[1] 尤文浩 谢伟[3] 张俊杨[4] 

机构地区：[1]中国石油大学(北京)石油工程教育部重点实验室,北京102249 [2]中国石油川庆钻探工程有限公司井下技术作业公司,甘肃庆阳745100 [3]中国石油塔里木油田分公司勘探开发研究院,新疆库尔勒841000 [4]中国石油天然气集团公司通信公司,河北廊坊065000

出　　处：《油气地质与采收率》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)

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.

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 

分 类 号：TE312[石油与天然气工程—油气田开发工程]