摘要
为了进一步提高稠油油藏蒸汽驱后期采收率和开发效益,以新疆油田J6区块为研究对象,通过室内三维物理模拟实验,分别对全射孔条件下蒸汽驱、CO2辅助蒸汽驱、CO2泡沫辅助蒸汽驱和射开下部油层下半部分条件下蒸汽驱、CO2辅助蒸汽驱进行了实验研究,提出了蒸汽驱后期CO2辅助蒸汽驱开发技术。室内实验表明:蒸汽驱后期调整射孔后的CO2辅助蒸汽驱形成了注汽井中下部蒸汽腔侧向扩展、生产井顶层蒸汽腔超覆重力泄油的开发模式,高温水、油、CO2能够形成稳定的低黏拟单相乳化流体,且CO2在顶部的蒸汽腔起到隔热作用,在蒸汽腔内部降低了蒸汽分压,有效提高了注入蒸汽热效率。根据新疆油田J6区块CO2辅助蒸汽驱设计和应用效果,调整射孔后,与蒸汽驱相比,CO2辅助蒸汽驱将油汽比从0.12提高到0.16,增长34.0%,阶段采出程度从16.1%提高到21.5%,最终采收率可以达到66.5%。
To improve the oil recovery and economic efficiency in heavy oil reservoirs in late steam flooding,taking J6 Block of Xinjiang Oilfield as the research object,3D physical modeling experiments of steam flooding,CO2-foam assisted steam flooding,and CO2 assisted steam flooding under different perforation conditions are conducted,and CO2-assisted steam flooding was proposed for reservoirs in the late stage of steam flooding.The experimental results show that after adjusting the perforation in late steam flooding,the CO2 assisted steam flooding formed a lateral expansion of the steam chamber in the middle and lower parts of the injection well and a development model for the production of overriding gravity oil drainage in the top chamber of the well;high temperature water,oil,and CO2 formed stable low-viscosity quasi-single-phase emulsified fluid;and CO2 acted as a thermal insulation in the steam chamber at the top,reducing the steam partial pressure inside the steam chamber,and effectively improving the heat efficiency of injected steam.Based on the three-dimensional experiments and the current situation of the J6 block in Xinjiang Oilfield,the CO2 assisted steam flooding for the J6 block was designed.The application showed that the CO2 assisted steam flooding made the oil vapor ratio increase from 0.12 to 0.16 by 34.0%,the oil recovery increase from 16.1%to 21.5%,and the final oil recovery goes up to 66.5%compared to pure steam flooding after perforation adjustment.
作者
席长丰
齐宗耀
张运军
刘彤
沈德煌
木合塔尔
董宏
李秀峦
蒋有伟
王红庄
XI Changfeng;QI Zongyao;ZHANG Yunjun;LIU Tong;SHEN Dehuang;MU Hetaer;DONG Hong;LI Xiuluan;JIANG Youwei;WANG Hongzhuang(State Key Laboratory of Enhanced Oil Recovery,PetroChina Research Institute of Exploration&Development,Beijing 100083,China;Research Institute of Petroleum Exploration&Development,PetroChina,Beijing 100083,China;Research Institute of Petroleum Exploration&Development,PetroChina Xinjiang Oilfield Company,Karamary 834000,China)
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2019年第6期1169-1177,共9页
Petroleum Exploration and Development
基金
国家科技重大专项“提高蒸汽驱效率技术研究”(2016ZX05012-002)
中国石油天然气股份有限公司科技专项“浅层稠油、超稠油开发技术研究与应用”(2012E-34-05)
关键词
稠油油藏
三维物理模拟实验
蒸汽驱
CO2辅助蒸汽驱
蒸汽腔
汽(CO2)腔超覆重力泄油
heavy oil reservoir
three-dimensional physical simulation experiment
steam flooding
CO2 assisted steam flooding
steam chamber
steam(CO2)chamber overriding gravity drainage
