Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (2): 1-7.doi: 10.12108/yxyqc.20190201

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Progress and application of CO2 fracturing technology for unconventional oil and gas

WANG Xiangzeng1, SUN Xiao2, LUO Pan2, MU Jingfu2   

  1. 1. Shaanxi Yanchang Petroleum(Group) CO., LTD., Xi'an 710075, China;
    2. Research Institute of Shannxi Yanchang Petroleum(Group) CO., LTD., Xi'an 710075, China
  • Received:2018-10-25 Revised:2019-01-18 Online:2019-03-21 Published:2019-03-21

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Abstract: Unconventional oil and gas are very important superseding resources in China,for poor porosity and permeability,reservoir simulation technology is necessary and large-scale hydraulic fracturing is very effective, but some consequent problems such as high water consumption,high reservoir damage and environmental pollution are inevasible. CO2 fracturing technology,which fully used the CO2 characteristics of easy to diffusion, good formation compatibility and increasing the formation energy, has advantages of saving water,protecting environment,burying CO2 and increasing oil and gas production. Laboratory experiment and field practice indicate that CO2 fracturing technology can effectively reduce reservoir damage, improve reservoir properties,reduce rock initiation pressure,form complex fracture network,replace CH4 and reduce crude oil viscosity. Compared with hydraulic fracturing technology,it can improve backflow rate above 25%,and improve the average single well production above 1.9 times. By further optimizing of technology,developing matching equipment and relevant standards,exploring the overall development of blocks,CO2 fracturing technology will greatly promote the green and efficient development of unconventional oil and gas in China.

Key words: unconventional oil and gas, CO2 fracturing, stimulation mechanism, technical progress

CLC Number: 

  • TE122.2
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