西南石油大学学报(自然科学版)

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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

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

CLC Number: