缝洞型油藏提高“阁楼油”采出程度物理模拟实验

Physical simulation experiment research on enhancing "attic oil" recovery in fracture-cavity reservoir

 季晓靖 2 蒲万芬 2 金发扬 张建军 赵帅 赵琦宁

西南石油大学石油与天然气工程学院，四川 成都 610500 西南石油大学油气藏地质及开发工程国家重点实验室，四川 成都 610500 中国石化西北油田分公司工程技术研究院，新疆 乌鲁木齐 830000 西南石油大学地球科学与技术学院，四川 成都 610500）

School of Oil and Natural Gas Engineering, Southwest Petroleum University, Chengdu 610500, China State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610500, China Engineering Research Institute, Northwest Company, SINOPEC, Urumqi 830000, China School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China)

 “阁楼油”是缝洞型碳酸盐岩油藏剩余油的重要存在形式，文中运用可视化物理模型直观研究了“阁楼油”的形成机理以及采用堵水和注气措施来提高“阁楼油”的采出程度。实验结果表明：油水密度差异是“阁楼油”形成的主要机理；缝洞连通关系和储集体排列方式明显影响“阁楼油”的采出程度。溶洞低部位沟通底水，堵水后溶洞高位缝沟通其他储集体时可以使采出程度大幅度增加，溶洞高部位沟通底水、出口裂缝位于溶洞的中低部位时，“阁楼油”仅靠堵水措施很难动用，配套注气措施可以进一步提高采出程度；储集体并联时的水驱采收率高于串联储集体，堵水后串联储集体更能高效启动“阁楼油”。

 "attic oil" is one kind of significant remaining oil in fracture?鄄cavity carbonate reservoir. Visual physical models are applied to research the formation mechanism of the "attic oil" and enhance recovery by water shutoff technology and gas injection. Experimental results show that oil?鄄water density difference is the main mechanism in the formation process of the attic oil. The recovery of the "attic oil" is associated with the location of bottom water connection cave and the fracture location of the cave export; when the lower parts of the cave connect bottom water, the high position fracture of the cave connects the other reservoir, which can increase the recovery factor after water plugging; when the high position of the cave connect bottom water and the fracture exit is in the middle and lower parts of the cave, the "attic oil" is difficult to be swept only by water shutoff, gas injection is an effective measure to enhance production; the arrangement of the reservoirs has an important impact on the "attic oil" recovery, the "attic oil" is more easily produced when reservoirs connect in series than in parallel after water shutoff.

10.6056/dkyqt201603023