临2馆三3正韵律厚油层特高含水期剩余油分布研究与挖潜

临盘油田临2馆三3油藏为正韵律厚油层,直井开发20多年后已进入特高含水开发阶段,成为典型的次生底水油藏,底水锥进严重,含水上升快,水驱油效率大大降低,开发调整效果较差.在充分研究该油藏开采特征和剩余油分布规律的基础上,设计了7口水平井,投产后效果很好,断块综合含水下降6.3%,采油速度提高0.91%,采收率提高7.2%,增加可采储量24×104 t.实践证明:搞清剩余油分布规律,运用水平井技术,对提高正韵律厚油层特高含水开发阶段的采收率是卓有成效的.

Distribution Rule of Remaining Oil Research and Potential Tapping Means in the Period of Super-high Water Cut of the Positive Rhythm Oil Reservoir Ng33Block Lin2

Ng 3 3 of Block Lin 2 is a typical positive rhythm thick layer oil reservoir in Linpan Oilfield,it has entered a high water-cut period of development.Having been developed over 20 years with vertical wells,it has been a secondary bottom-water oil reservoir.The effect of development and adjustment with vertical wells is not relatively well,as a result of bottom water coning more seriously,water-cut rising faster and water displacement efficiency being lower.On the basis of research on the characteristic of oilfield development and the distribution rule of remaining oil,7 horizontal wells have been designed.After putting into production,the effect is comparatively well.The composite water cut has been decreased by 3%,the rate of oil production has been increased 0.91%.and oil recovery has been increased 22%,240,000 t of recoverable reserves has been obtained.