不同成因岩溶储集体氮气辅助重力驱实验  

Experimental Study on Nitrogen⁃Assisted Gravity Drainage in Karst Reservoirs of Different Genesis

作　　者：程洪 CHENG Hong(No.2 Oil Production Plant,Northwest Oilfield Company,Sinopec,Luntai,Xinjiang 841604,China)

机构地区：[1]中国石化西北油田分公司采油二厂,新疆轮台841604

出　　处：《新疆石油地质》2023年第5期613-617,共5页Xinjiang Petroleum Geology

基　　金：国家自然科学基金企业创新发展联合基金(U19B6003-02-06)。

摘　　要：针对塔河油田储集体复杂特点和中—下部剩余油动用难题,结合地质信息和建模结果,构建了考虑储集体类型、裂缝分布及裂缝-缝洞组合关系的储集体剖面模型,开展了表层岩溶储集体、古暗河储集体和断溶储集体的驱替实验,并对油气水多相流动进行可视化分析;研究了氮气辅助重力驱前后的剩余油赋存状态,对比了不同成因岩溶储集体采收率提高程度。结果表明:对于不同成因的岩溶储集体,氮气辅助重力驱均有助于实现均衡驱替,但不同成因岩溶储集体高采收率程度存在差异,断溶储集体、表层岩溶储集体和古暗河储集体原油采收率分别提高12%、9%和7%;有助于明确储集体类型对氮气辅助重力驱的影响,为缝洞型油藏提高采收率技术发展提供支持。The reservoirs in the Tahe Oilfield are complex and the remaining oil in the middle-lower part is difficult to recover.Based on the geological data and modeling results,a reservoir profile model considering reservoir type,fracture distribution and fracture-vug configu-ration was constructed.This model enables the displacement experiments for surface karst reservoirs,underground river reservoirs,and fault-karst reservoirs,and also the visual analysis of oil-gas-water multiphase flow.The remaining oil distribution before and after nitrogen-assisted gravity drainage(NAGD)was investigated,and the differences in enhanced oil recovery(EOR)for karst reservoirs of different gene-sis were compared.The results show that NAGD contributes to balanced displacement for karst reservoirs of different genesis,but achieves varying efficiency of EOR-by 12%,9%,and 7%respectively for fault-karst reservoirs,surface karst reservoirs,and underground river res-ervoirs.The research findings help to understand the influence of reservoir types on NAGD,providing support to the advancement of EOR techniques for fractured-vuggy reservoirs.

关 键 词：塔河油田 碳酸盐岩储集层 缝洞型油藏 岩溶储集体 氮气辅助重力驱 剩余油 提高采收率 

分 类 号：TE357[石油与天然气工程—油气田开发工程]