重力泄水辅助蒸汽驱油水分异影响因素分析
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摘要
重力泄水辅助蒸汽驱是目前特深层巨厚砂岩稠油油藏的主要开发方式,能够有效排泄地层积水,提高蒸汽热利用率和蒸汽腔扩展程度。油藏内的含水及注入蒸汽的冷凝水在重力及压力梯度场复合作用下顺利泄至下水平井达到驱泄平衡,是重力泄水辅助蒸汽驱高效开发的关键。储层埋藏深、粘度高,直平组合井网归属立体开发渗流,独特的油藏特性及井组开发特点导致其泄水规律极其复杂,油水分异的描述是泄水机理研究的难点之一。根据稠油渗流理论,建立油水分异系数模型。结合稠油启动压力梯度实验结果,通过数值计算,重点分析油相温度、压力梯度、油层厚度及油层倾角对油水分异规律影响,取得研究成果为明确稠油油水分异机理及泄水规律提供科学依据。
Gravity drainage assisted steam drive is a primary recovery method of developing heavy oil reservoir with special deep and quite thick sandstone, it can effectively discharge formation water, improve the utilization efficiency of steam heat and the extensional extent of steam chamber. The water inside reservoir and condensed from injected steam successfully flows into the Horizontal well by combined action of gravity field and pressure gradient field, which leads to a balance between drive and drainage, which is the key to gravity drainage assisted steam drive for sufficient developing. The reservoir is deep and the viscosity is high. The combination of vertical and horizontal well net belongs to stereoscopic developing filtering flow. The special reservoir characteristics and the well group characteristics make the drainage rule quite complex. The description of oil-water differentiation is one of problems of researching drainage mechanism. The model of oil-water differentiation factor was developed based on heavy oil seepage flow theory. Combined with the experimental results of the actuating pressure gradient and Using the method of numerical calculation, the influence of the oil phase temperature, pressure gradient, reservoir thickness and formation dip angle on oil-water differentiation was analyzed. The research can provide scientific foundation for clearing the oil-water differentiation mechanism of heavy oil and drainage rule.
Gravity drainage assisted steam drive is a primary recovery method of developing heavy oil reservoir with special deep and quite thick sandstone, it can effectively discharge formation water, improve the utilization efficiency of steam heat and the extensional extent of steam chamber. The water inside reservoir and condensed from injected steam successfully flows into the Horizontal well by combined action of gravity field and pressure gradient field, which leads to a balance between drive and drainage, which is the key to gravity drainage assisted steam drive for sufficient developing. The reservoir is deep and the viscosity is high. The combination of vertical and horizontal well net belongs to stereoscopic developing filtering flow. The special reservoir characteristics and the well group characteristics make the drainage rule quite complex. The description of oil-water differentiation is one of problems of researching drainage mechanism. The model of oil-water differentiation factor was developed based on heavy oil seepage flow theory. Combined with the experimental results of the actuating pressure gradient and Using the method of numerical calculation, the influence of the oil phase temperature, pressure gradient, reservoir thickness and formation dip angle on oil-water differentiation was analyzed. The research can provide scientific foundation for clearing the oil-water differentiation mechanism of heavy oil and drainage rule.
引文
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[6]孙振宇.重力泄水辅助蒸汽驱在深层稠油油藏的研究与应用[J].石化技术,2015,22(9).
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[2]任芳祥,周鹰,孙洪安,张金红.深层巨厚稠油油藏立体井网蒸汽驱机理初探[J].特种油气藏,2011,06:61-65+126.
[3]任芳祥.辽河油区老油田二次开发探索与实践[J].特种油气藏,2007,06:5-10+95.
[4]任芳祥,孙洪军,户昶昊.辽河油田稠油开发技术与实践[J].特种油气藏,2012,19(1):1-8.
[5]王春生,任芳祥.稠油重力驱渗流速度影响因素分析[J].特种油气藏,2013,05:97-99+155.
[6]孙振宇.重力泄水辅助蒸汽驱在深层稠油油藏的研究与应用[J].石化技术,2015,22(9).
[7]Griffin PJ,Trofimenkoff P N.Laboratory Studies of the steam-assisted gravity drainage proceeded[J].AOSTRA J of research,1986,2(4):97-203.
[8]程宏岗,刘池洋,陈建军,等.《中国海上油气(地质)》载文与引文分析[J].中国海上油气:地质,2003,17(4):289-292.
[9]王选茹,程林松,刘双全,等.蒸汽辅助重力泄油对油藏及流体适应性研究[J].西南石油学院学报,2006,28(3):57-60.
[10]杨乃群,常斌,程林松.超常规稠油油藏改进的蒸汽辅助重力泄油方式应用研究[J].中国海上油气:地质,2003,17(2):123-127.