Volume 36 Issue 1
Feb.  2019
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LI Qiang, WANG Yanling, LI Qingchao, WANG Fuling, YUAN Lin, BAI Hao. Thickening Performance and Thickening Mechanism of a Viscosifier for CO2 Fracturing Fluid[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(1): 102-108. doi: 10.3969/j.issn.1001-5620.2019.01.020
Citation: LI Qiang, WANG Yanling, LI Qingchao, WANG Fuling, YUAN Lin, BAI Hao. Thickening Performance and Thickening Mechanism of a Viscosifier for CO2 Fracturing Fluid[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(1): 102-108. doi: 10.3969/j.issn.1001-5620.2019.01.020

Thickening Performance and Thickening Mechanism of a Viscosifier for CO2 Fracturing Fluid

doi: 10.3969/j.issn.1001-5620.2019.01.020
  • Received Date: 2018-09-15
  • Publish Date: 2019-02-28
  • CO2 fracturing fluid requires suitable viscosifiers to increase its viscosity. A branched polysiloxane was developed for use in CO2 fracturing fluid as a viscosifier. The branched polysiloxane is synthesized with octamethylcyclotetrasiloxane and tetramethylt etravinylcyclotetrasiloxane as raw materials, hexamethyldisiloxane as blocking agent, pentamethyldisiloxane as branching additive, and tetramethylammonium hydroxide and chloroplatinic acid as catalyst. The molecular structure of the viscosifier was characterized using FT-IR method, and CO2 fracturing fluid treated with the viscosifier studied for its performance. It was found that, at 20 ℃, the viscosity of a CO2 fracturing fluid treated with 7% polydimethylsiloxane was 1.66 mPa·s, while the viscosity of another CO2 fracturing fluid treated with 7% synthesized branched polysiloxane viscosifier of the same molecular weight (as that of the polydimethylsiloxane) was 6.67 mPa·s, showing that the branched polysiloxane viscosifier is a better viscosifier for CO2 fracturing fluid. The viscosity of the CO2 fracturing fluid increases with increase in the concentration of the branched polysiloxane viscosifier in the fracturing fluid. At viscosifier (branched polysiloxane viscosifier) concentration of 1% to 3%, when pressure is increase from 8 MPa to 14 MPa, the viscosity of the CO2 fracturing fluid increased remarkably. On the other hand, the viscosity of the CO2 fracturing fluid decreases greatly as temperature increases. The branched polysiloxane viscosifier synthesized in this study is able to better increase the viscosity of CO2 fracturing fluid than polydimethylsiloxane, and has thickening ability that is almost the same as that of viscosifiers manufactured abroad. This paper also discusses the thickening mechanisms of the branched polysiloxane.

     

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