西南石油大学学报(自然科学版)

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A New Experimental Apparatus for Fracturing Shale Gas Reservoir to
Enhance Permeability with Supercritical Carbon Dioxide

Xian Xuefu1,2*, Yin Hong1,2, Zhou Junping1,2, Jiang Yongdong1,2, Zhang Daochuan1,2   

  1. 1. State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Shapingba,Chongqing 400044,China
    2. College of Resources and Environment Science,Chongqing University,Shapingba,Chongqing 400044,China
  • Online:2015-06-01 Published:2015-06-01

Abstract:

The process of hydraulic fracturing of shale gas reservoir will consume large amounts of water. Duo to the high density
and diffusivity of gas,supercritical CO2 can replace water as fracturing fluid,showing a very good application prospects.
Based on this,we proposed increasing the permeability of shale gas reservoir with supercritical CO2 fracturing and independently
developed experimental device. The device is mainly composed of the CO2 booster system,triaxial loading and control
system,oil bath temperature control system,acoustic emission system,and its axial pressure control range is 0∼100 MPa,
confining pressure control range is 0∼25 MPa,maximum heating temperature is 100 ?C,specimen size is 100 mm×200 mm.
The apparatus can precisely control CO2 phase and acquire data of shale rupture stress-strain,pressure,temperature,acoustic
emission signals,and can get supercritical CO2-induced shale gas reservoir permeability dynamics of cracking shale process in
multi-field(stress,temperature,pressure)coupling conditions,providing experimental platform for supercritical CO2 fracturing
increasing shale gas reservoir permeability mechanism study.

Key words: shale gas, hydraulic fracturing, supercritical CO2, permeability, acoustic emission