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作 者:张宗斌[1] 邱子刚[1] 米热尼沙·吐尔逊 华美瑞[1] 刘德华[2] 屈亚光[2] 叶习文 ZHANG Zongbin;QIU Zigang;Mi Genisha·Tulson;HUA Meirui;LIU Dehua;QU Yaguang;YE Xiwen(Research Institute of Exploration and Development,Xinjiang Oilfield Branch,CNPC,Karamay 834000,Xinjiang;School of Petroleum Engineering,Yangtze University,Wuhan 430100,Hubei)
机构地区:[1]中国石油新疆油田分公司勘探开发研究院,新疆克拉玛依834000 [2]长江大学石油工程学院,湖北武汉430100
出 处:《长江大学学报(自然科学版)》2021年第4期66-73,共8页Journal of Yangtze University(Natural Science Edition)
基 金:中国石油科技重大专项“火山岩油藏效益开发关键技术研究与应用”(2017E-0405)。
摘 要:新疆XQ井区火山岩储层物性差,投入开发后存在地层能量不足、产量递减快、采出程度低的问题,为优选符合该类油藏的有效开采模式以及找出不同方式的驱油特点,提高油气采收率,以该井区安山质火山岩为研究对象,基于核磁共振技术,对岩心分别开展了CO_(2)驱油和水驱油试验,分析不同驱油方式对岩心孔隙油水动用情况以及驱油效率的影响。试验结果表明,岩心孔隙构成主要为小孔隙,少量为中孔隙和大孔隙,油相主要分布在小孔隙区域,小孔隙为主要产油贡献区;总体原油采收率较低,驱替采油作用主要发生在流体注入初期,注水开发方式的采收率高于注CO_(2)开发;岩石物性参数孔隙度与渗透率对于原油采收率有一定的影响,呈正线性关系,实际生产时应结合现场具体情况选取合适的注采方案。在制定实际开发方案时,可通过提高开采初期流体注入压力和注入量来提高初始阶段采出程度,提高经济效益。The physical property of volcanic reservoir in XQ well block in Xinjiang is poor.After being put into development,there are some problems,such as insufficient formation energy,rapid production decline and low recovery degree.In order to optimize the effective production mode of this kind of reservoir,find out the characteristics of different ways of oil displacement,and improve the oil and gas recovery,taking andesitic volcanic rock in this well block as the research object,based on nuclear magnetic resonance technology,CO_(2) oil displacement and water-oil displacement tests were carried out on the core respectively to analyze the influence of different oil displacement methods on oil-water production and oil displacement efficiency in core pores.The test results show that the pore structure of the core is mainly small pores,and a few are medium pores and macropores;The oil facies is mainly distributed in the small pore area,and the small pores are the main contribution area of oil production.The overall oil recovery is low,and the displacement recovery mainly occurs in the early stage of fluid injection,and the recovery rate of water injection is higher than that of CO_(2) injection.Petrophysical parameters,porosity and permeability,have certain influence on crude oil recovery,presenting a positive linear relationship.In actual production,the appropriate injection and production plan should be selected according to the specific situation of the site.In the formulation of the actual development plan,the initial stage recovery degree can be improved by increasing the injection pressure and injection volume of the fluid in theinitial stage of production,and thus the economic benefit can be improved.
关 键 词:火山岩 核磁共振 水驱油 CO_(2)驱油 驱油效率 提高采收率
分 类 号:TE349[石油与天然气工程—油气田开发工程]
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