红河油田空气泡沫驱实验

Experimental studies of air-foam flooding in dual media reservoir

鄂尔多斯盆地南部红河油田长8油藏为典型的致密双重介质储层，注水采油时出现沿裂缝水窜现象。导致开发效果变差．为有效补充地层能量、提高采收率，开展红河油田长8储层空气泡沫驱实验．通过空气原油氧化实验，确定红河油田原油与空气在地层条件下可以发生低温氧化反应，反应速率为（0．025～0．110）×10^-3mol（O2）／（h·g）（oil）；通过泡沫体系优选实验，优选阻力因子高、封堵能力强、可有效封堵储层裂缝的泡沫体系；通过长岩心空气泡沫驱油实验，认为空气泡沫驱的采收率比水驱的提高15％以上，气体突破时产出气体中O2的体积分数为1．34％～3．81％，满足空气驱的安全范围．结果表明：空气泡沫驱综合泡沫驱与空气驱的稳定、耐温、耐油和较强封堵能力等优点，在红河油田具有较好适用性，为红河油田提高采收率提供技术储备．

Chang8reservoir of Honghe oilfield in the south of Ordos basin is a typical dual media reservoir.Water injection is difficult,low producing degree of reserves.To effectively supplement energy,improve the Honghe oilfield recovery,to carry out the Honghe oilfield air foam flooding experiment.Crude oil oxidation test show that the oil of the chang8 reservoir and air can occur low temperature oxidation reaction,the reaction rate is(0.025~0.110)×10-5 mol(O2)/(h·g)(oil);The resistance factor of foam system preferably high,sealing ability is strong,suitable for sealing the Honghe fracture in oil field;Laboratory evaluation showed that the air foam flooding recovery than water flooding to improve more than 15%,the oxygen content in gas produced in 1.34%~3.81% when gas breakthrough,satisfy the safety range of air injection.Laboratory evaluation study shows air foam flooding comprehensive the advantages of air foam flooding and flooding,that air foam flooding in Honghe oil has good applicability,for the Honghe oil EOR technology provides the technical reserve.