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牛心坨油田自2002年以来在主体部位实施分层系注水调整,目前进入中高含水期快速递减阶段,可采储量采出程度81.7%,综合含水达到72%。目前下层系及合采区水窜、水淹严重,进入中高含水期。牛心坨油田是低渗裂缝性油藏,生产井为压裂投产,导致油水关系复杂,加上注水井调剖轮数的增加和井组采出程度的提高,残余油分布越加零散,动用难度日趋加大。近几年,在牛心坨油田实施的注水井深部调剖虽然取得了较好的稳油控水效果,但措施效果逐渐变差。
Niuxintuo Oilfield has implemented stratified system waterflooding adjustment in the main part since 2002, and now it has entered the stage of rapid decreasing of middle and high water cut stage. The recoverable reserves are collected by 81.7% and the comprehensive water content reaches 72%. At present, the lower strata and co-mining area water channeling, serious flooding, into the high water cut period. Niuxintuo Oilfield is a low permeability fractured reservoir, production wells for fracturing production, resulting in complex oil and water, coupled with the injection wells and the formation of the number of rounds increase the degree of recovery, residual oil distribution more fragmented, Increasing difficulty to use. In recent years, deep injection profile control in Niuxintuo oilfield has achieved good effect of stabilizing water, but the effect is gradually getting worse.