低渗油藏极限井排距的确定  

Determination of the Utmost Well Array Spacing of Low Permeability Oil Reservoirs

作　　者：何右安[1] 饶巧[1] 魏玉萍[1] 曲春霞[1] 

机构地区：[1]中国石油长庆油田分公司勘探开发研究院,710021

出　　处：《低渗透油气田》2007年第1期79-82,70,共5页

摘　　要：低渗透储层喉道半径小、渗透率低、流体渗流时存在启动压力梯度。根据室内试验测试的启动压力梯度实验数据，在统计得出长庆油田的启动压力梯度与渗透率关系式的基础上，结合等产量一源一汇的稳定径向流的水动力场中的压力梯度分布公式，可理论计算出能建立有效驱替压力系统的低渗透油藏的极限注采并排距。以西峰油田某井区长8油藏为例，计算出其极限并排距，该区的实际注水开发效果表明，采用在理论计算的技术政策界限内的实际并排距的井网注水开发，建立了该区块长8油藏有效驱替压力系统。Low permeability reservoirs are with small pore-throat radius. There is a starting pressure gradient in the fluid percolation. According to laboratory testing data of starting pressure gradient, the utmost injector-producer array spacing can be theoretically worked out to establish an effective displacement pressure system of low-permeability reservoirs, on the basis of statistical relationship formula of starting pressure gradient and permeability of Changqing oilfield, by combining the pressure gradient distribution formula in the hydrodynamic field of the stable radial flow of one-injector-to-one-producer balanced yields. Taking Chang8 reservoirs of certain well area in Xifeng oilfield for example, their utmost well array spacing is worked out. The actual waterflooding development effect shows that an effective displacement pressure system of the Chang8 reservoirs in the area could be established by waterflooding of adopting well patterns of which the actual well array spacing is within the calculated technical policy limit.

关 键 词：低渗透 启动压力梯度 极限并排距 

分 类 号：TE348[石油与天然气工程—油气田开发工程]