Chemical Industry and Engineering Progress ›› 2017, Vol. 36 ›› Issue (S1): 533-539.DOI: 10.16085/j.issn.1000-6613.2017-1451

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Disposal scheme of produced gas and CO2 capture for re-injection in CO2 EOR

MA Pengfei1, HAN Bo1, ZHANG Liang1, XIONG Xiaoqin2, SHEN Xiaoxia2, ZHANG Xin2, REN Shaoran1   

  1. 1. China University of Petroleum(East China), Qingdao 266580, Shandong, China;
    2. PetroChina Xinjiang Oilfield Engineering Design Institute, Kelamayi 834000, Xinjiang, China
  • Received:2017-07-14 Revised:2017-08-01 Online:2017-12-13 Published:2017-12-31

油田CO2驱产出气处置方案及CO2捕集回注工艺

马鹏飞1, 韩波1, 张亮1, 熊小琴2, 沈晓霞2, 张昕2, 任韶然1   

  1. 1. 中国石油大学(华东), 山东 青岛 266580;
    2. 中石油新疆油田工程设计院, 新疆 克拉玛依 834000
  • 通讯作者: 张亮,博士,副教授。研究方向为油气田开发;任韶然,教授,研究方向为油气田开发。
  • 作者简介:马鹏飞(1991-),男,硕士研究生。E-mail:mapengfei1991@126.com。
  • 基金资助:
    “十三五”国家油气重大专项(2016ZX05056004-003)项目。

Abstract: CO2 EOR and storage is an effective method to reduce greenhouse gas emission associated with tertiary oil recovery. With the CO2 breakthrough in production wells, selection the best way to dispose the associated gas will become important. In this paper, the general rule of CO2-associated gas produced during CO2 injection is analyzed. The feasibility and application range of three production gas disposal options are evaluated, including direct re-injection or mixed with pure CO2 for re-injection, combustion for power generation associated with flue gas re-injection, and CO2 capture for rejection. The preliminary screen criteria for these gas disposal options is established. Further, four different CO2 capture techniques are also compared in applicability and economy, including chemical absorption, low-temperature fractionation, pressure swing adsorption and membrane separation. Taking CO2 EOR and storage projects in Weyburn and Jilin oilfields, the main process of CO2recycling is analyzed, which can provides valuable insights for the CO2disposal in the other CO2 EOR and storage projects. The results show that direct re-injection or mixed with pure CO2 for re-injection is preferred for the treatment of CO2-associated gas in the oil field. Secondly, CO2separation and purification of the produced gas is considered. The scale of CO2-EOR plants are usually small or middle in domestic, which choose pressure swing adsorption and low-temperature fractionation, while the large scale plants in foreign countries once used chemical absorption and membrane separation to capture CO2 from associated gas.

Key words: CO2 flooding, capture and separation, scheme selection, case analysis

摘要: CO2驱及地质埋存技术是油田提高采收率和减少温室气体排放的有效手段,但随着CO2在油井中突破,面临着含CO2伴生气的处置技术和捕集回注工艺的优选问题。本文分析了油田CO2驱产出气一般规律,论证了含CO2伴生气直接/掺和回注、燃气轮机/锅炉燃烧及烟道气回注和捕集分离回注等处置方案的可行性及适用范围,初步建立了含CO2伴生气处置方案优选依据。重点比较了化学吸收法、低温分馏法、变压吸附法和膜分离等CO2捕集分离工艺的适用性和经济性。基于Weyburn油田和吉林油田CO2驱项目,分析了油田CO2驱产出气处置及回注工艺的主要流程。研究结果表明:对于油田含CO2伴生气的处置,首选直接/掺和回注;其次考虑对产出气进行CO2分离提纯,国内CO2驱项目一般小到中等规模,变压吸附和低温分馏工艺受到青睐,国外大规模CO2驱项目则有采用膜分离和化学吸收法捕集分离CO2的经验。

关键词: 二氧化碳驱, 二氧化碳捕集, 方案选择, 案例分析

CLC Number: 

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