特低渗均质型油藏高含水期稳油控水技术研究

Research on the technology of stabilizing oil and controlling water in the high water cut period of the super low permeability homogeneous reservoir

以五里湾为代表的特低渗均质型油藏进入中高含水期后,平面水驱均匀推进,水驱波及半径增大,剩余油零散分布,剖面上主力小层动用程度高,剩余油呈米~厘米级规模相间分布,常规的注采调控技术动用难度大。此类油藏进入高含水期如何稳产,如何提高最终采收率是油藏面临的核心技术难点。本文在深入剖析开发矛盾基础上,立足一次井网水驱,寻找挖潜的技术潜力,通过理论研究结合矿场实践,形成了以精细单砂体动用技术、不稳定注水技术和空气泡沫驱为核心的稳油控水技术系列,实现了剩余油的精准动用且提高采收率发展趋势良好,同时形成的各项技术对同类油藏高含水期稳油控水具有较强的技术借鉴指导意义。

The extra-low permeability homogeneous reservoir represented by Wuliwan enters the middle and high water cut stage,and the plane water drive is advanced uniformly,the sweep radius of water drive increases,and the residual oil is scattered. The main small layer in the section is used to a high degree,and the residual oil is distributed in phases of meter-centimeter scale,so it is difficult to use conventional injection and production control technology.How to stabilize production and how to improve ultimate recovery are the key technical difficulties for such reservoirs when they enter high water cut stage. In this paper,on the basis of in-depth development of contradiction,based on a pattern of water flooding,looking for potential technical potential.Through theoretical research combined with field practice,formed by fine single sand body use technology,unstable water injection technology and air foam flooding water control technology as the core of oil series.Precision using the residual oil and enhance oil recovery trend is good.At the same time,the technology to form of similar reservoir of high water cut period stabilizing oil water control has stronger technical significance for reference.