濮城油田东区沙二上层系剩余油分布及开发思路探讨

The Distribution of Remaining Oil and Development Design in Upper Sha No.2 in the East Pucheng Field

郭齐军 吴玉铃

GUO Qi-jun WU Yu-ling

中国石化股份有限公司 油田事业部, 北京 100029; 中国石化 中原油气高新股份有限公司, 河南 濮阳 457000

Oil and Gas Development Business Unit, SINOPEC, Beijing 100029, China; Zhongyuan Oil and Gas Ltd Co., SINOPEC, Puyang 457000, China

中原油田分公司濮城油田东区沙二上2+3开发层系,10余年前油田开采已进入综合开发治理阶段,目前油田综合含水达95.8%,地质采出程度为26.1%,工业采出程度为84.6%,可采储量全部动用,产出油水比为0.36,开采成本增加,经济效益下降。根据剩余油分布规律研究成果认识:原来在同一构造圈闭、具有统一边底水的层状油藏,目前在不断调剖注水的条件下剩余油分布已成为被水淹层包围、分割零乱的不规则"块状"油藏。从这一认识出发,晚期剩余油开采,要想提高采收率、提高经济效益,必须改变以往开发指导思想,按新思路,加强精细研究,采取有针对性的开发方式,分块分而治之,才能达到降本增效的目的。笔者认为,这一认识值得处在同样情况下的剩余油藏开发思考。

Ten years ago, the production on upper Sha no.2 in the East Pucheng Field has been into a comprehensive treatment stage. Now the contained water of the field has been upto 95.8%. The geological productive rate and industrial productive rate are 26.1% and 84.6% respectively. All the recovered reserves have been utilized. The productive ratio of oil/water is 0.36. The increase of the productive cost decreases economic efficiency. The study on distribution of remaining oil shows that the integral layer reservoir in a same structural trap and with same bottom water has been cut into scattered reservoir by continuously injected water. Based on this conclusion, in order to increase production rate and economic efficiency, it is necessary to use different development modes for different reservoir blocks in the late productive stage on remaining oil.