缝网压裂裂缝形态对低渗油藏渗吸采油效果影响实验
Petroleum Geology & Oilfield Development in Daqing（2017）
Abstract
大庆油田外围地区低渗油藏储量非常丰富,但由于缺乏有效的开发手段,采出程度比较低.渗吸采油是(弱)亲水低渗油藏有效开发的技术措施之一.以大庆外围扶余储层流体性质和地质特征为模拟对象,在仿真模型上开展缝网压裂裂缝长度和条数对渗吸采油效果影响实验.研究结果表明:随缝网压裂裂缝主缝长度和分支缝数量增加,渗吸面积增加,油水交渗作用增强,渗吸采收率增加,但增幅逐渐减小;“渗吸液+增能剂”组合使用能够产生原油降黏、补充驱替动力和油水交渗等3因素间协同效应,可以大幅度提高渗吸采油效果,采收率增幅超过15％.
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Key words
Daqing Oilfield,low-permeable oil reservoir,network fracturing,imbibition recovery,physical simulation,mechanism analysis
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