摘要
基于伊拉克哈法亚油田Khasib油藏油气水分布特征,设计岩心驱替实验,评价不同驱替方式、驱替参数对驱油效率的影响规律。研究表明,边部注水驱替时,先期衰竭开采有利于气顶弹性膨胀,形成“上压下顶”的立体驱替作用,驱油效果较好;顶部注气、边部注水气水协同驱替时,注入时机对高、低部位驱油效果的影响规律不同,考虑整体驱油效率,注入压力应大于原油饱和压力;推荐两种驱替方式合理注入时机为20~25 MPa。注入速度对不同注入介质影响规律一致,适当降低注入速度,有利于驱替前缘稳定,延缓注入介质突破,改善驱油效果,实验条件下水驱合理注入速度为0.075 mL/min,气水协同驱替合理注水速度0.15 mL/min、注气速度0.10 mL/min。气水协同驱替有利于高部位原油产出,原油采收率比边部水驱方式高5.0~14.8个百分点,推荐为Khasib油藏中后期合理开发方式。
Based on the oil,gas and water distribution characteristics of Khasib reservoir in Halfaya oilfield,Iraq,a core displacement experiment is designed to evaluate the influence of different displacement methods and displacement parameters on oil displacement efficiency.The research shows that,in the displacement method with water injected from the edge of the reservoir,early depletion production is conducive to the elastic expansion of the gas cap,forming the three-dimensional displacement of"upper pressure and lower pushing",and the oil displacement effect is good.When gas injection at the top and water injection at the edge are used for synergistic displacement,the injection timing has different influences on the oil displacement effects of high and low parts.Considering the overall oil displacement efficiency,the injection pressure should be greater than the bubble point pressure of crude oil.Two displacement methods are recommended with the reasonable injection time at 20-25 MPa.The injection speed has the same influence on different injection media.Appropriately reducing the injection speed is conducive to the stability of the displacement front,delaying the breakthrough of injection media and improving the oil displacement effect.The reasonable injection rate of water flooding is 0.075 mL/min,the reasonable injection rates of water and gas are 0.15 mL/min and 0.10 mL/min,respectively in gas-water synergistic displacement.Gas-water synergistic displacement is conducive to the production of crude oil at high position,and has crude oil recovery 5.0%-14.8%higher than water flooding from the edge,so it is recommended as the development mode of Khasib reservoir at the middle and late stages.
作者
汪周华
王涛
刘辉
李楠
朱光亚
郭平
WANG Zhouhua;WANG Tao;LIU Hui;LI Nan;ZHU Guangya;GUO Ping(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China;PetroChina Research Institute of Exploration&Development,Beijing 100083,China)
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2022年第3期548-556,共9页
Petroleum Exploration and Development
基金
中国石油天然气集团有限公司科学研究及技术开发项目“海外油气田开发关键技术研究与应用——伊拉克低渗孔隙型生屑灰岩油藏储层表征及高效开发技术研究”(2019D-4410)。
关键词
边水气顶油藏
开发方式
水驱
气水协同驱替
注入时机
注入速度
gas-cap edge-water reservoir
development mode
waterflooding
gas-water synergistic displacement
injection timing
injection speed
作者简介
第一作者:汪周华(1979-),男,湖北宜昌人,博士,西南石油大学研究员,主要从事气田与凝析气田开发、注气提高采收率及非常规油气开发等方面的研究工作。地址:四川省成都市新都区新都大道8号,西南石油大学油气藏地质及开发工程国家重点实验室,邮政编码:610500。E-mail:wangzhouhua@126.com;联系作者:王涛(1997-),男,陕西咸阳人,西南石油大学在读硕士研究生,主要从事气田开发理论与方法、注气提高采收率技术等研究。地址:四川省成都市新都区新都大道8号,西南石油大学油气藏地质及开发工程国家重点实验室,邮政编码:610500。E-mail:2499736623@qq.com。
