稀油油藏注蒸汽热采提高开采效果

探讨了3类稀油油藏注蒸汽热采的经济和技术可行性。对于含蜡低渗透油藏，通过物理模拟和数值模拟研究了注蒸汽提高开采效果的可行性，在大庆油田外围朝阳沟低渗透油藏2口生产井进行的蒸汽吞吐现场试验结果表明，蒸汽吞吐是有效的增产措施；对于吉林油田扶余水驱稀油油藏，用油藏工程方法研究其转蒸汽驱的可行性，对1个井组的开发指标和经济效益预测结果表明，水驱稀油油藏转蒸汽驱可提高采收率20％以上；对大庆油田聚合物驱油藏转蒸汽驱的可行性进行了物理模拟和数值模拟研究，对比分析了蒸汽驱与聚合物驱提高采收率的不同机理，初步研究表明，这类油藏转蒸汽驱后可提高采收率10％以上。图1表4参10

Enhancing development efficiency of conve-ntional reservoir by cyclical steam stimulation

Economic and technological feasibilities of cyclical steam stimulation (CSS) in three types of conventional reservoirs are discussed. For waxy low-permeability reservoir, feasibility of CSS to enhance development efficiency is studied by physical and numerical simulations, the field experiment in the two production wells in the Chaoyanggou low-permeability reservoir, periphery of Daqing Oilfield, shows that CSS is an effective stimulation method. For Fuyu water-drive conventional reservoir in the Jilin Oilfield, feasibility of converting to steam displacing is investigated by using reservoir engineering method, development index and economic profit prediction of one well group are given, the study demonstrates that the increased recovery may be over 20% if water-driving changes to steam-displacing. Feasibility of changing polymer-driving of Daqing Oilfield to steam displacing is studied by physical and numerical simulations, the mechanisms of enhancing recovery by steam-displacing and polymer-driving are analyzed by comparison, elementary investigation shows that the recovery of this kind of reservoir can be increased more than 10% if it changes to steam displacing.