西南石油大学学报(自然科学版) ›› 2017, Vol. 39 ›› Issue (1): 133-139.DOI: 10.11885/j.issn.1674-5086.2015.04.24.01

• 石油与天然气工程 • 上一篇    下一篇

缝洞型碳酸盐岩油藏注气吞吐EOR效果评价

苏伟1,2,3,4, 侯吉瑞1,2,3,4, 刘娟1,2,3,4, 朱道义1,2,3,4, 席园园1,2,3,4   

  1. 1. 中国石油大学(北京)提高采收率研究院, 北京 昌平 102249;
    2. 中国石油三次采油重点实验室, 北京 昌平 102249;
    3. 中国石油大学(北京)石油工程教育部重点实验室, 北京 昌平 102249;
    4. 中国石化海相油气藏开发重点实验室, 北京 海淀 100086
  • 收稿日期:2015-04-24 出版日期:2017-02-01 发布日期:2017-02-01
  • 通讯作者: 苏伟,E-mail:532018851@qq.com
  • 作者简介:苏伟,1990年生,男,汉族,江苏南通人,博士研究生,主要从事提高采收率与采油化学方面的研究。E-mail:532018851@qq.com;侯吉瑞,1965年生,男,汉族,吉林松原人,教授,博士生导师,主要从事化学驱原理与技术,深部调堵应用技术及相关机理,CO2驱油相关理论与技术等方面的研究。E-mail:houjirui@126.com;刘娟,1990年生,女,汉族,黑龙江绥芬河人,硕士研究生,主要从事提高采收率与采油化学方面的研究。E-mail:liujuansfh@sohu.com;朱道义,1990年生,男,汉族,湖北武汉人,博士研究生,主要从事提高采收率与采油化学方面的研究。E-mail:zhu_daoyi@163.com;席园园,1992年生,女,汉族,山东聊城人,硕士研究生,主要从事提高采收率与采油化学方面的研究。E-mail:254643606@qq.com
  • 基金资助:
    国家科技重大专项(2011ZX05014-003);国家重点基础研究发展计划(“973”计划)(2011CB201006)。

Evaluation of EOR Effect of Gas Huff-n-puff in Fractured Vuggy Carbonate Reservoirs

SU Wei1,2,3,4, HOU Jirui1,2,3,4, LIU Juan1,2,3,4, ZHU Daoyi1,2,3,4, XI Yuanyuan1,2,3,4   

  1. 1. Enhanced Oil Recovery Research Institute, China University of Petroleum(Beijing), Changping, Beijing 102249, China;
    2. Key Laboratory Tertiary Recovery, CNPC, Changping, Beijing 102249, China;
    3. MOE Key Laboratory for Petroleum Engineering, China University of Petroleum(Beijing), Changping, Beijing 102249, China;
    4. SINOPEC Key Laboratory of Marine Oil & Gas Reservoir Production, Haidian, Beijing 100086, China
  • Received:2015-04-24 Online:2017-02-01 Published:2017-02-01

摘要: 缝洞型碳酸盐岩稠油油藏以大型溶洞、溶蚀孔洞及裂缝为主要储集空间,非均质性极强,针对此类油藏,注气吞吐是一种有效的开发方式。为了探索缝洞型碳酸盐岩油藏注气吞吐开发效果,设计并制作了适用于缝洞型油藏吞吐室内物理模拟实验装置,从换油率、产气速率、产气量等方面对比分析了4种吞吐介质(CO2、N2、先注CO2后注N2、先注N2后注CO2)的吞吐效果,分析了作用机理。实验结果表明:注气吞吐提高采收率效果显著,最低换油率的N2吞吐也能达到0.422;CO2与N2混合气吞吐中,CO2溶于原油中能使其黏度降低,N2由于重力分异作用占据缝洞高部位形成气顶,这种协同作用使得CO2与N2混合气吞吐效果好于单一注气吞吐;而在注气顺序上先注N2后注CO2吞吐效果更加明显,换油率可达0.861。缝洞型油藏注气吞吐开采是一种行之有效提高采收率的方法,先注N2后注CO2混合气吞吐可获得更显著的开发效果。

关键词: 缝洞型稠油油藏, 注气吞吐, 吞吐物理模型, 二氧化碳, 氮气, 提高采收率

Abstract: Large water-eroded caves, solution pores, and fractures are the main spaces of fractured vuggy carbonate reservoirs with strong heterogeneity. The technology of gas huff-n-puff is an effective way to improve oil recovery in such reservoirs. In this study, an indoor physical simulation apparatus was designed and produced for carbonate reservoirs in order to explore the huff-n-puff effect of different gases. The huff-n-puff effect and its mechanism for four gases(CO2, N2, CO2 injected before N2, CO2 injected after N2) were analyzed considering the parameters of oil change rate, gas generation rate, and cumulative gas production. The experimental results show that the huff-n-puff mechanism of the four injected gases is obvious. The lowest oil change rate was 0.422(N2 huff-n-puff). The mixed gas (CO2 and N2 mixture) huff-n-puff fully develops a synergistic effect. CO2 dissolved in crude oil decreases oil viscosity, while N2 occupies the high positions of caves and forms a gas cap due to gravitational differentiation. The huff-n-puff effect of the gaseous mixture of CO2 and N2 is better than that of a single gas, and CO2 injection after N2 huff-n-puff can achieve the best effect with an oil change rate of 0.861. Experimental research shows that gas huff-n-puff is an effective EOR, and the huff-n-puff effect of CO2 injected after N2 is more remarkable.

Key words: fractured-vuggy heavy oil reservoir, gas injection huff-n-puff, huff-n-puff physical simulation, CO2, N2, enhanced oil recovery

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