Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (6): 151-159.doi: 10.12108/yxyqc.20180619

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Rock breaking mechanism of CO2 and fracturing technology

DING Yong1,2, MA Xinxing1, YE Liang1, XIAO Yuanxiang1, ZHANG Yanming1, GU Yonghong1, MA Chaoxing3   

  1. 1. Research Institute of Oil & Gas Technology, PetroChina Changqing Oilfield Company, Xi'an 710018, China;
    2. National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Xi'an 710018, China;
    3. No.11 Oil Production Plant, PetroChina Changqing Oilfield Company, Xifeng 745000, Gansu, China
  • Received:2018-02-02 Revised:2018-09-04 Online:2018-11-16 Published:2018-11-16

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Abstract: In order to make clear the change rule of effective stress during the injection processes with different media and reveal the mechanical mechanism of low break down pressure, long penetrate distance and high fracture distribution density during super-critical CO2 fracturing, based on linear elastic porous medium model and linear decomposition of anisotropic stress on wellbore plane, pressurization rate was introduced to carry out correction of pore pressure and additional circumferential stress. In view of the characteristics of tight gas reservoir in Changqing gas field, with the dual advantages of CO2 rock breaking, pressurizing and slick water volume fracturing, geological reserve volume difference method of gas reservoir was improved to optimizing the CO2 injection quantity. According to the monitoring data of down hole pressure gauge, the dynamic filtration loss equilibrium point was analyzed, and the CO2 construction displacement was obtained. Thanks to anti-freeze isolating liquid, a single fracturing unit operation process was formed. Finally, CO2 volume fracturing technology was formed. The result shows that fracture initiation pressure dropped by 69.2% in the case of liquid CO2 and 75.5% in the case of super-critical CO2. Pilot tests were carried out on six wells in eastern Ordos Basin, 100% cleanup with no nitrogen lift, and the average single layer initial gas rate of subject wells is 75 900 m3/d, which indicates that CO2 fracturing techniques is expected to be a new stimulation method for Changqing gas field.

Key words: tight gas, CO2 fracturing, rock breaking criterion, mechanism of increasing production

CLC Number: 

  • TE357.3
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