4.6 Article

Turbulent Drag Reduction with an Ultra-High-Molecular-Weight Water-Soluble Polymer in Slick-Water Hydrofracking

期刊

MOLECULES
卷 27, 期 2, 页码 -

出版社

MDPI
DOI: 10.3390/molecules27020351

关键词

water-soluble polymer; drag reducer; slick-water; hydrofracking; rheological behavior

资金

  1. Sinopec Science and Technology Project [P20046-3]
  2. National Natural Science Foundation of China [U1762218]
  3. State Key Laboratory of Polymer Materials Engineering [sklpme2014-2-06]

向作者/读者索取更多资源

In this study, a high viscosity water-soluble friction reducer (HVFR) was synthesized and investigated for its potential application in slick-water hydrofracking of shale oil and gas reservoirs. The results showed that HVFR exhibited significant drag reduction performance and could retain its viscosity under various conditions, indicating its prospective use in the oil and gas industry.
Water-soluble polymers as drag reducers have been widely utilized in slick-water for fracturing shale oil and gas reservoirs. However, the low viscosity characteristics, high operating costs, and freshwater consumption of conventional friction reducers limit their practical use in deeper oil and gas reservoirs. Therefore, a high viscosity water-soluble friction reducer (HVFR), poly-(acrylamide-co-acrylic acid-co-2-acrylamido-2-methylpropanesulphonic acid), was synthesized via free radical polymerization in aqueous solution. The molecular weight, solubility, rheological behavior, and drag reduction performance of HVFR were thoroughly investigated. The results showed that the viscosity-average molecular weight of HVFR is 23.2 x 10(6) g.mol(-1). The HVFR powder could be quickly dissolved in water within 240 s under 700 rpm. The storage modulus (G ') and loss modulus (G '') as well as viscosity of the solutions increased with an increase in polymer concentration. At a concentration of 1700 mg.L-1, HVFR solution shows 67% viscosity retention rate after heating from 30 to 90 degrees C, and the viscosity retention rate of HVFR solution when increasing C-NaCl to 21,000 mg.L-1 is 66%. HVFR exhibits significant drag reduction performance for both low viscosity and high viscosity. A maximum drag reduction of 80.2% is attained from HVFR at 400 mg.L-1 with 5.0 mPa.s, and drag reduction of HVFR is 75.1% at 1700 mg.L-1 with 30.2 mPa.s. These findings not only indicate the prospective use of HVFR in slick-water hydrofracking, but also shed light on the design of novel friction reducers utilized in the oil and gas industry.

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