Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (1): 178-184.doi: 10.12108/yxyqc.20240117

• PETROLEUM ENGINEERING AND OIL & GAS FIELD DEVELOPMENT • Previous Articles    

Pre-CO2 energy storage fracturing technology in horizontal wells for medium-deep heavy oil

YANG Zhaochen1, LU Yingbo1, YANG Guo1, HUANG Chun1, YI Dalin1, JIA Song1, WU Yongbin2, WANG Guiqing1   

  1. 1. Fengcheng Oilfield District, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China;
    2. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China
  • Received:2022-02-28 Revised:2022-05-23 Online:2024-01-01 Published:2024-01-02

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Abstract: The development mechanism, key operating parameters and development effects of CO2 energy storage pre-fracturing technology for horizontal wells were studied by using the parameters of medium-deep heavy oil reservoirs in Wuxia area, northwestern margin of Junggar Basin. The results show that:(1) With the extension of development stages such as fracturing, soaking and production, the oil wells after pre-CO2 energy storage fracturing show the characteristics of energy increase, diffusion and viscosity reduction, expansion and energy supplement, and secondary foam oil displacement. The bottom hole flowing pressure increased by 2-4 MPa, the CO2 diffused to one third of the reservoir, the crude oil viscosity decreased to less than 500 mPa·s, and the foam oil flow was obvious.(2) The optimal fracturing interval in the study area is 60 m, the half length of the fracture is 90 m, the fracture conductivity is 10 t/m, the optimal CO2 injection intensity is 1.5 m3/m, the injection rate is 1.8 m3/min, the soaking time of oil wells is 30 d, and the oil reservoir recovery factor increases by 2%-3%.(3) Compared with conventional fracturing, the pre-CO2 energy storage fracturing can increase the production by 5.2 t/d, and the oil exchange rate of CO2 is predicted to be 2.45. The development effect was significantly improved.

Key words: medium-deep heavy oil, horizontal well, CO2 energy storage fracturing, low-carbon oil recovery, Wuxia area, Junggar Basin

CLC Number: 

  • TE345
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