Volume 37 Issue 2
Apr.  2020
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XU Liu, FU Meilong, HUANG Qian, WANG Jie, ZHAO Zhongcong. A New Supercritical CO2 Fracturing Fluid Containing Silicon Thickener: It's Rheological Property and Core Damage Evaluation[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(2): 250-256. doi: 10.3969/j.issn.1001-5620.2020.02.020
Citation: XU Liu, FU Meilong, HUANG Qian, WANG Jie, ZHAO Zhongcong. A New Supercritical CO2 Fracturing Fluid Containing Silicon Thickener: It's Rheological Property and Core Damage Evaluation[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(2): 250-256. doi: 10.3969/j.issn.1001-5620.2020.02.020
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A New Supercritical CO2 Fracturing Fluid Containing Silicon Thickener: It's Rheological Property and Core Damage Evaluation

doi: 10.3969/j.issn.1001-5620.2020.02.020

  • School of Petroleum Engineering, Yangtze University, Wuhan, Hubei 430100

  • Received Date: 2020-01-06
  • Publish Date: 2020-04-28
    Abstract
  • A silicon thickener has been developed to deal with the problems that supercritical CO2 fracturing fluid is faced with, such as low viscosity and poor sand carrying capacity. The rheological properties and core damage of supercritical CO2 fracturing fluid were studied to provide a reference for the selection of thickeners and field fracturing operation. Two thickeners have been developed through solution polymerization; one is polymethylsilsesquioxane (PMSQ) and the other, a copolymer of polymethylsilsesquioxane and vinyl acetate (PMSQ-VAc). The main functional groups of the two thickeners were characterized with IR spectroscopy. The viscosifying effect of the two thickeners in supercritical CO2 fracturing fluids and the rheological property of the fracturing fluids treated with the thickeners were measured with high pressure pipe flow experiment through long pipe. The filtration property and damaging capacity of supercritical CO2 fracturing fluids flowing through long natural cores with artificial fractures were also valuated. It was found in these studies that the thickening effect of the PMSQ thickener and the PMSQ-VAc thickener first increased and then decreased with temperature and pressure. As the concentration of the thickeners increased, the viscosity of the two CO2 fracturing fluids first increased and then decreased. Compared with PMSQ, PMSQ-VAc has better thickening effect in supercritical CO2 fluid; the viscosity of supercritical CO2 fluid can be increased by PMSQ-VAc to 3.892 mPa·s. In cores with permeability of 0.551 mD, supercritical CO2 mixed with PMSQ-VAc had a low filtration coefficient of 1.435×10-2 m/min1/2, a low filtration rate of 0.010 m/min and percent core damage of 16.33%-25.36%, which is weak.

     

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