中深层稠油蒸汽驱注采剖面调整工艺技术研究

Technology of Injection and Production Profile Adjustment for Steam Flooding in Mid-deep Heavy Oil Reservoirs

从1997年开始,辽河油田进行了中深层稠油蒸汽驱先导试验,目前已进入蒸汽驱先导试验的后期调整阶段,先导试验区的稠油采出程度由试验前的24%提高到57%,基本达到方案设计指标,先导试验获得成功。然而,在蒸汽驱先导试验及随后的扩大试验中,存在着纵向动用程度不均、平面动用程度差等问题,影响蒸汽驱先导试验效果。为此,从2004年开始,辽河油田钻采工艺研究院开展了中深层稠油蒸汽驱注采剖面调整工艺技术研究工作,形成了中深层稠油蒸汽驱注采剖面调整系列技术,主要包括耐高温化学调堵技术与机械封堵技术,并应用于现场,有效解决了蒸汽驱层间、层内动用不均的问题,提高了中深层稠油的采收率。下一步仍需加大高温调剖剂的深入研究,研制高效、经济的高温调剖剂;对生产井机械封堵工艺技术的研究重点,是加快对耐高温胶筒的选优,满足现场生产需求。

Since 1997,pilot test of steam flooding for heavy oil production in mid-deep heavy oil reservoir has been carried out in Liaohe oilfield.At present,the pilot test has entered its final adjustment stage,and degree of reserve recovery in the pilot area has increased from 24%（before steam flooding） to 57%（after steam flooding）.Meanwhile,index for program design have been achieved basically,which means the successful application of the pilot test.However,problems such as inhomogeneous vertical utilization and insufficient areal utilization of the reservoir existed during the pilot and expanding tests,which will affect the overall effect of the steam flooding.Therefore,since 2004,Drilling Production Technology Research Institute of Liaohe Oilfield Company began to study injection and production profile adjustment technology for steam flooding in mid-deep heavy oil reservoirs and developed a series of technologies such as chemical profile control and water plugging technology（high-temperature resistance）and mechanical plugging technology.After these technologies were applied for field application,insufficient utilization of the reservoir between and within the intervals has been solved effectively and recovery ratio has been improved substantially.In the future,thorough research still needs on efficient and economic high-temperature profile control agent.The key of the research on mechanical plugging technology for production wells is the optimization of high-temperature seal so as to satisfy the need of field production.