Volume 33 Issue 1
Jan.  2016
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LIU Zhenguang, QIU Zhengsong, ZHONG Hanyi, MENG Meng. Study on Filtration Property of Hypercritical CO2 Fracturing Fluid for Shale Reservoirs[J]. DRILLING FLUID & COMPLETION FLUID, 2016, 33(1): 113-117. doi: 10.3969/j.issn.1001-5620.2016.01.023
Citation: LIU Zhenguang, QIU Zhengsong, ZHONG Hanyi, MENG Meng. Study on Filtration Property of Hypercritical CO2 Fracturing Fluid for Shale Reservoirs[J]. DRILLING FLUID & COMPLETION FLUID, 2016, 33(1): 113-117. doi: 10.3969/j.issn.1001-5620.2016.01.023

Study on Filtration Property of Hypercritical CO2 Fracturing Fluid for Shale Reservoirs

doi: 10.3969/j.issn.1001-5620.2016.01.023
  • Received Date: 2015-08-09
  • Publish Date: 2016-01-30
  • Filter loss of fracturing fluid plays a major role in the geometry of fractures created by the fracturing fluid and the performance of fracturing. Reports on the filtration property of hypercritical CO2 fracturing fluid used in shale formation fracturing have not been found at present. Experiments have been conducted on shale reservoir cores (buried at 1,300-2,300 m, with natural fractures developed) taken from the Longmaxi Formation in Sichuan Basin, using a self-made filtration simulator, to study the filtration property of CO2 fracturing fluids with different initial phase states, at 55℃ and (confining pressure) 20 MPa, and different injection pressures and back pressures. Analyses of the experimental data indicate that in the conditions mentioned above, the filtration coefficient of CO2 fracturing fluids is between 1.00×10-4 m/min0.5 and 48.17×10-4 m/min0.5, with the spurt loss being negative. The filtration rate of CO2 fracturing fluid increases with increases in injection pressure, differential pressure, and the widths of fractures. The dominant factor affecting the filtration property of CO2 fracturing fluid in different conditions is different; at hypercritical state (7.38 MPa, 31.1℃), the CO2 fracturing fluid, because of its high viscosity, has a lower filtration coefficient.

     

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