辽河油田静观2块高凝油油藏注水温度优选  

Optimal Water Injection Temperature of High Pour-Point Oil Reservoir in Jingguan-2 Block in Liaohe Oilfield

作　　者：喻鹏[1] 马腾[1] 周炜[2] 唐仲华[1] 

机构地区：[1]中国地质大学环境学院,武汉430074 [2]中国石油勘探开发研究院,北京100083

出　　处：《新疆石油地质》2015年第5期570-574,共5页Xinjiang Petroleum Geology

基　　金：国家油气重大专项(2011ZX05009-002)

摘　　要：辽河油田静观2块高凝油油藏注冷水开发效果差,为此,对水驱油效果进行了实验,对储集层冷伤害进行了研究。运用热力学方法,通过求解注水井地层带数值模型,确定最佳注水温度,对油藏冷、热水驱替效果进行对比,同时预测井间温度场分布。研究结果表明,温度是高凝油油藏开发过程中极为敏感的一个参数。当油藏温度低于析蜡温度时,原油析出蜡晶,堵塞地层孔道,对储集层造成不同程度的冷伤害,同时原油流变性发生改变,渗流阻力变大,驱油效率降低;热水驱替能有效改善高凝油油藏开发效果,增加原油流度,提高采收率。但注水温度并非越高越好,在考虑驱油效率的同时还应兼顾开发成本的限制,最终确定静观2块高凝油油藏最佳注水温度为80℃.Aiming at the poor development effect by cold waterflooding of Jingguan-2 block,the properties of crude oil were qualitativelyanalyzed,the reservoir cold damage was studied by water injection well＇s temperature buildup testing and waterflooding experiment. Thethermodynamic method was used to determine the optimal injection temperature based on solving the numerical model of reservoir. Further-more,the development efforts under cold and hot water displacement were compared and the interwell temperature field distribution waspredicted by reservoir numerical simulation. The result shows that temperature is a very sensitive parameter with oiling. Varying degrees ofcold damage is a consequence of paraffin deposition and reservoir channel plug from decline of temperature below the cloud point tempera-ture. Simultaneously,precipitated paraffin changes the rheological properties of crude oil thereby increasing the filtration resistance and re-ducing the oil displacement efficiency. The hot water displacement process can effectively improve the high pour-point oil reservoir devel-opment effect,increasing oil mobility and enhancing oil recovery. Nevertheless,water injection temperature is not as high as possible,thelimit of development cost must be taken into account with the increase of displacement efficiency,the final optimal water injection tempera-ture of Jingguan-2 block is 80 ℃.

关 键 词：辽河油田 静观2块 高凝油油藏 温度场 冷伤害 析蜡温度 热水驱替 数值模拟 

分 类 号：TE341[石油与天然气工程—油气田开发工程] TE349