安塞油田中高含水期剩余油有效动用技术研究

安塞油田是典型的低渗透油藏,经过20多年的开发,目前已进入中高含水期,开发矛盾也日益突出,主要存在油井见水后产量递减快、储层天然微裂缝发育、剩余油分布更加复杂、套损及水淹关井逐年增多等问题。结合安塞油田多年开发实践效果,在研究剩余油分布规律的基础上,开展了井网调整、重复压裂、堵水调驱、套损井治理工艺技术研究,形成了安塞油田中高含水期剩余油有效动用技术。该技术在安塞油田推广应用1 100余井次,累计增油20余万吨,采收率提高了1.8%,油藏整体开发形势较好。

Effective production technology of remaining oil in high water cut stage of Ansai oilfield

Ansai Oilfield is a typical low-permeability reservoirs,after 20 years of development,it has entered the high water cut stage,the development contradictions are increasingly prominent,which mainly manifest in fast production decline after water production in oil wells,developed natural microfractures,complex remaining oil distribution,casing damage,flooding shut increasing year by year and etc.In combination with development practices of Ansai oilfield,based on the remaining oil distribution regularities,the studies on pattern adjustment,repeated fracturing,water control flooding,controlling measures of casing damage have been carried out and the effective use of technology remaining oil has been developed.The technology has been applied in wells of Ansai oilfield for 1100 times,with accumulative oil production of 20 million tons,increased recovery of 1.8%and good overall development situation.