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分层开采是合理开发油田,提高采油速度,保证油田具有较高的最终采收率的基本手段之一。特别象克拉玛依这样一个砾岩油田,纵向横向岩性物性变化大、断层多、压力系统不一、各主要层系原油物性不一致,加之油田初期采用简单合采的办法进行开采,形成了油井小层不能普遍发挥作用,油井迅速见水等问题。如某区某井,在分采前的 S_5~(2-2)层,采油速度已高达8.7%,而 S_1、S_4~2、S_5~(1-2)三个层采油速度仅1%左右。为
Stratified mining is one of the basic means to develop oilfields reasonably, increase oil recovery rate and ensure high ultimate oil recovery. In particular, a conglomerate oilfield such as Karamay has large vertical and horizontal lithologies that vary widely in physical properties, with many faults and different pressure systems. The crude oil properties in all major formations are inconsistent. In addition, the early oilfields are mined by simple, Can not generally play a role, wells quickly see water and other issues. For example, in a well in a certain area, the oil recovery rate has reached as high as 8.7% at S_5 ~ (2-2) before sub-mining, while the oil recovery rate at S_1, S_4 ~ 2 and S_5 ~ (1-2) . for