海上稠油两种热采方式开发效果评价

为了给海上稠油油田选择热采技术提供依据，对多元热流体吞吐和蒸汽吞吐2种热采方式的开发效果进行了评价。根据实际地质油藏参数建立了热采单井地质模型，运用数值模拟方法，设置了注入热焓相同和注入量相同2种方案，并结合现场先导试验对比分析了多元热流体吞吐和蒸汽吞吐的开发特征和效果。通过数值模拟得出:在注入热焓相同（4.3×1013 J）的条件下，多元热流体吞吐和蒸汽吞吐的采收率分别为18.3%和12.4%；在注入量相同（227 m3/d）的条件下，多元热流体吞吐和蒸汽吞吐的采收率分别为17.5%和13.3%，多元热流体吞吐的采收率是蒸汽吞吐的1.3~1.5倍。在现场先导试验中，多元热流体井的产能是蒸汽吞吐井的1.5倍。研究结果表明，多元热流体吞吐比蒸汽吞吐提高采收率的幅度大，更适于开发海上稠油油田。 

Evaluation of Two Thermal Methods in Offshore Heavy Oilfields Development

Comparative study on development effect of multi-thermal fluid and steam huff and puff was done to provide the basis for optimum thermal technique selection in offshore heavy oilfields development.Geologic model for single thermal single well was established according to the actual reservoir parameters using numerical simulation method and in which two injection schemes were set:the same injection enthalpy value,and the same injection rate and combining with the field development pilot.The characteristics and effects of the two thermal techniques were comparatively analyzed.The numerical simulation result showed that the recovery rates of multi-thermal fluid and steam huff and puff methods were 18.3% and 12.4%,at the same injected enthalpy(4.3×1013 J),and those for two thermal methods are 17.5% and 13.3% at the same injection rate(227 m3/d),the recovery rate of from multi-thermal fluid was 1.3 to 1.5 times of that from steam huff and puff method.The deliverability from multi-thermal fluid huff and puff well was 1.5 times of that from steam huff and puff well in the field pilot.So the multi-thermal fluid huff and puff,which can enhance oil recovery more than steam huff and puff,is more suitable for offshore heavy oil fields development.