油气藏评价与开发 ›› 2021, Vol. 11 ›› Issue (6): 805-811.doi: 10.13809/j.cnki.cn32-1825/te.2021.06.002

• 专家论坛 • 上一篇    下一篇

中国石化低渗透油藏CO2驱油实践与认识

计秉玉(),何应付   

  1. 中国石化石油勘探开发研究院,北京 102206
  • 收稿日期:2021-04-19 出版日期:2021-12-26 发布日期:2021-12-31
  • 作者简介:计秉玉(1963—),男,博士,教授级高级工程师,本刊第二届编委会委员,现主要从事基础渗流理论、油气藏工程和提高采收率等研究。地址:北京市昌平区百沙路197号中国石化石油勘探开发研究院,邮政编码:102206。E-mail: jiby.syky@sinopec.com
  • 基金资助:
    国家科技重大专项“鄂尔多斯致密低渗油气藏注气提高采收率技术研究”(2016ZX05048-003)

Practice and understanding about CO2 flooding in low permeability oil reservoirs by Sinopec

JI Bingyu(),HE Yingfu   

  1. Sinopec Exploration and Production Research Institute, Beijing 102206, China
  • Received:2021-04-19 Online:2021-12-26 Published:2021-12-31

摘要:

针对水驱难以有效开发的低—特低渗透油藏,中国石化开展了30余个CO2驱矿场试验,取得了初步效果与认识。首先系统阐述了中国石化CO2驱矿场试验进展和典型油藏的效果,分析了技术政策和关键指标的变化特点,指出了中国石化发展CO2驱面临的问题,并提出了发展建议。分析表明,CO2驱解决了低—特低渗透油藏有效补充能量的难题,采用连续注气转水气交替的注入方式,方案实施6个月左右油井见效,平均单井增油1倍以上,换油率介于0.15~0.40 t/t。但中国石化低—特低渗透油藏最小混相压力多高于25 MPa,CO2驱混相程度低;同时,低成本气源匮乏,使得CO2驱经济效益受限。建议在争取国家政策补贴的基础上,实施CCUS(碳捕获、利用与封存)整体优化,并发展CO2与化学剂复合驱、尾追烟道气/氮气驱技术,改善驱油效果,提升经济效益。

关键词: CO2驱, 低渗透油藏, 先导试验, 实践、技术政策, 发展建议

Abstract:

In order to solve the problem that water flooding is difficult to effectively develop low-ultra-low permeability reservoirs, Sinopec has carried out more than 30 field tests of CO2 flooding, and achieves preliminary results and understanding. In this paper, firstly, the field test progress of CO2 flooding and typical reservoir effects of SINOPEC are systematically described. Then, the change characteristics of technical policies and key indicators are analyzed. Finally, the problems faced by the development of CO2 flooding in Sinopec are pointed out, and the development suggestions are put forward. The analysis reveals that the CO2 flooding is an effective method to supplement energy for the low and ultra-low permeability reservoir. In order to produce more oil, WAG (water alternating gas) flooding are performed after continuous gas flooding. The oil well take effects about 6 months after the program is implemented. The average oil production by single well is increased by more than one-time and the oil change rate is 0.15~0.40 t/t. But the economic benefit through CO2 flooding is limited by two problems. The first one is that the minimum miscible pressure for CO2 is usually higher than 25 MPa in the low and ultra-low permeability reservoir and it is difficult to achieve fully miscible condition. The second one is that the lack of low-cost gas sources limits the economic benefits of CO2. In order to improve the oil displacement efficiency and achieve high economic benefit, not only the national subsidy policy is required, but also the optimization for CCUS is needed. The CO2 flooding can also be performed with chemical agents, flue gas or nitrogen to improve oil displacement effect and enhance economic benefit.

Key words: CO2 flooding, low permeability reservoir, pilot test, implement, technical policy, development proposal

中图分类号: 

  • TE341