西南石油大学学报(自然科学版)

• 石油与天然气工程 • 上一篇    下一篇

分层注CO2 井系统模型研究

刘永辉1 *,罗程程1,张烈辉1,王峰2,辛涛云2   

  1. 1.“油气藏地质及开发工程”国家重点实验室· 西南石油大学,四川成都610500
    2. 中国石油吉林油田采油工艺研究院,吉林松原138000
  • 出版日期:2015-10-01 发布日期:2015-10-01
  • 通讯作者: 刘永辉,E-mail:swpilyh@126.com
  • 基金资助:

    国家科技重大专项(2011ZX05054);国家杰出青年科学基金(51125019)。

Research on the Model of Separate Layer CO2 Injection Well System

Liu Yonghui1*, Luo Chengcheng1, Zhang Liehui1, Wang Feng2, Xin Taoyun2   

  1. 1 . State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500,China
    2. Production Technology Research Institute,Jilin Oilfield,PetroChina,Songyuan,Jilin 138000,China
  • Online:2015-10-01 Published:2015-10-01

摘要:

分层配注CO2 是解决注气提高采收率过程中不同地层间的层间矛盾,实现不同渗透性的地层都能够有效地
注入CO2,维持地层压力,提高气驱动用储量和采收率的重要手段。基于分层配注CO2 的思想,考虑井筒温度和CO2
相态的变化建立了井筒温度压力耦合数学模型,根据注气时段,建立了地层吸气模型,并耦合气嘴嘴损建立了考虑多
个注气层的注入井数学模型,提出了相应的数值求解方法。模拟计算结果表明:要提高较差注气能力油层的配注量,
井口注气压力需要达到一个临界值,合理地选择井口注气压力和气嘴直径是实现分层配注的关键。该研究成果为分
层配注CO2 提供了重要的理论依据。

关键词: 分层注CO2, 温度压力耦合, 气嘴压降, 提高采收率, 模拟计算

Abstract:

Separate layer CO2 injection is an important method to settle the contradictions among layers in the process of
gas injection EOR and it can,ensure effective injection of CO2 into layers with different permeabilities,maintain formation
pressure and improve producing reserves of gas drive and recovery. Based on the idea of separate layer CO2 injection,this paper
establishes a temperature-pressure coupling mathematical model considering the temperature of wellbore and the phase change
of CO2,a gas-injection of reservoir model depending on the period of gas-injection and an injection well model coupling choke
loss and taking multilayers into consideration,then proposes a corresponding numerical method. Simulation and calculation
results show that wellhead injection pressure should reach a critical value in order to improve the injection rate of reservoir with
poor gas-injection capacity. Choosing the wellhead injection pressure and the choke diameter reasonably is the key to fulfilling
separate layer CO2 injection. The research results provide a theoretical support for separate layer CO2 injection.

Key words: separate layer CO2 injection, temperature and pressure coupling, pressure loss of choke, EOR, simulation and
calculation

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