摘要
基于水电相似原理,通过电模拟实验,研究了低渗透油藏水平井长度、裂缝长度、裂缝条数与间距、主井筒与裂缝夹角等因素对产能的影响。结果表明:产能随着主井筒长度增大而增大,但增大趋势逐渐变缓;产能随着裂缝间距和裂缝条数的增大而增大,并且均存在一最佳间距和条数匹配值;缝条数较少时,主井筒流入对产能的贡献较大,但随着缝条数的增多,贡献值减小;裂缝长度对产能也有较大影响;裂缝与主井筒成较大夹角时能获得较高产能,最佳角度约为75～90°。分清各因素对产能的影响,可为压裂水平井的设计提供理论指导。
The impacts of horizontal well length, fracture length, the number and spacing of fractures, and the angle between horizontal wellbore and fractures on productivity have been studied for low permeability reservoirs through electric simulation experiment based on the theory of hydro-electric analogy. The result shows that the productivity increases with the length of horizontal wellbore, but the tendency of increasing slows down; the productivity also increases with the spacing and number of fractures, and there is an optimal match value between fracture spacing and numbers; the contribution of the main hole inflow is big when there are less fractures, but becomes smaller when the number of fractures increases; the length of fractures also has an impact on productivity; the productivity is high when the angle between wellbore and fractures is big, and the optimal angle is approximately 75 ~ 90°. A thorough understanding of the impact of various factors on productivity may provide theoretical guidance for the designing of fractured horizontal wells.
出处
《特种油气藏》
CAS
CSCD
2009年第2期90-93,共4页
Special Oil & Gas Reservoirs
基金
863项目"特殊结构井开发油藏工程技术"(2007AA09Z314)部分成果
关键词
电模拟
低渗透油藏
压裂水平井
产能
electric analogy
low-permeability reservoir
fractured horizontal well
productivity
