辽河中深层稠油油藏蒸汽驱后开发方式优化研究

Optimization study of development methods for medium-deep heavy oil reservoir of Liaohe Oilfield after steamflooding

欢喜岭油田齐40区块先导试验汽驱已经开展了10a,现已进入蒸汽驱开发后期,汽驱开发潜力有限。通过数值模拟发现,蒸汽驱后转热水驱开发为最佳开发方式。注热水开发易于实现对下部储层的动用,还能够充分利用地层已经形成的余热,且成本较低。齐40区块通过注采参数优选,确定合理井底注水温度为150℃,注采比为1.2∶1,注水方式采取笼统注水,且尽快转注热水开发效果较好。

A pilot test of steam flooding,which is located in block Qi 40 of Huanxiling Oilfield,has been carried out for 10 years and is now into last stage of the steam flooding,therefore the development potential for the steamflooding is limited.Numerical simulation results show that the best development method is hot water flooding after steam flooding.Injecting hot water can not only flood the bottom of the reservoir easily but also make use of the surplus energy formed in the reservoir.In addition,the cost of hot water flooding is relatively low.Based on optimization of injection and production parameters for the block Qi 40,the reasonable water injection temperature of downhole is identified as 150 ℃,the injection-production ratio is 1.2∶1,the injection method is commingled water injection,and the earlier steamflood converts to hot waterflood,the better development effect is.