摘要
探讨气顶油藏屏障注水提高油藏开发效果的机理,并优化屏障注水参数。以国外某气顶油藏的储层特征为基础,通过油藏数值模拟方法,对气顶油藏屏障注水运移规律及作用机理进行分析。结果表明,屏障形成前,屏障水以径向流的运移规律向气顶和油环流动,分别补充油区与气区地层能量,延长开发年限,有效抑制气顶膨胀能,减缓油气界面运移速度,降低油井生产油气比,提高油井开发效果。当屏障形成后,屏障切断油区与气区的通道,将气顶油环分为一个大气顶小油环与小气顶大油环,实现气顶油环单独开采,有效防止油气互窜。结合该油藏的开发政策,优化气顶油环屏障注水参数及开发方式,分别从油侵损失量和气顶油环采出程度两个方面综合考虑,最优屏障井位置随着注采比的增加逐渐往气顶方向移动,并最终稳定在一定位置。
The development effect of barrier waterflooding on gas cap reservoir and its optimization of waterflooding parameter are discussed. Based on the characteristics of a gas reservoir abroad, the numerical model of oil reservoir is established in order to analyze its migration law and mechanism action. Before the formation of barrier, barrier water flows towards places of gas cap and oil ring according to the migration law of radial flow so as to supply the formation energy of the oil and gas area, extend the development age limit, effectively restrain the expansion energy of gas cap, reduce the migration velocity of the oil gas interface, reduce the gas oil ratio for the production of oil well and improve the development effect of oil wells. After the formation of barrier, the barrier cuts off the passageway of the oil area with the gas area and divide the gas cap oil reservoir into a big gas cap with small oil loop and a small gas cap with big oil loop, creating a condition favorable for the separated exploitation of gas cap and oil ring, and effectively prevent the mutual mixture of oil and gas. In combination with the development policy of the oil reservoir, the parameters and development method of barrier waterflooding for oil reservoir with gas cap and oil ring are optimized. Comprehensive consideration is given to the loss amount of oil immersion and the recovery percent of reserves. The position of the optimal barrier gradually migrates towards the gas cap along with the increase of injection production ratio, and finally stabilized in a certain position.
作者
刘佳
程林松
范子菲
黄世军
宋珩
赵伦
LIU Jia;CHENG Linsong;FAN Zife;HUANG Shijun;SONG Heng;ZHAO Lun(CNOOC Research Institute,Beijing 100028,China;Key Laboratory of Petroleum Engineering,China University of Petroleum,Beijing 102249,China;Research Institute of Petroleum Ezcploration and Development,Beijing 10083,China)
出处
《成都理工大学学报（自然科学版）》
CAS
CSCD
北大核心
2018年第5期559-564,共6页
Journal of Chengdu University of Technology: Science & Technology Edition
基金
国家自然科学基金项目(51674273)
关键词
气顶
油环
屏障注水
数值模拟
开发机理
gas cap
oil rim
barrier waterflooding
numerical simulation
development mechanisms
