Volume 38 Issue 5
Sep.  2021
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AN Na, LUO Pandeng, LI Yongshou, et al.Preparation of and study on sulfonated humic acid/guar gum fracturing fluid[J]. Drilling Fluid & Completion Fluid，2021, 38（5）：657-662 doi: 10.12358/j.issn.1001-5620.2021.05.018
Citation: AN Na, LUO Pandeng, LI Yongshou, et al.Preparation of and study on sulfonated humic acid/guar gum fracturing fluid[J]. Drilling Fluid & Completion Fluid，2021, 38（5）：657-662 doi: 10.12358/j.issn.1001-5620.2021.05.018
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Preparation of and Study on Sulfonated Humic Acid/Guar Gum Fracturing Fluid

doi: 10.12358/j.issn.1001-5620.2021.05.018
  • 1.

    Northwest Oilfield Company, SINOPEC, Urumqi, Xinjiang, 830011

  • 2.

    Key Laboratory of Light Chemical Additives Chemistry and Technology, Ministry of Education, Shaanxi University of Science and Technology, Xi'an, Shaanxi, 710021

  • Received Date: 2021-06-08
  • Accepted Date: 2021-08-17
  • Publish Date: 2021-09-30
    Abstract
  • Humic acid is sulfonated with sodium sulfite to produce sulfonated humic acid (SHA) which is mixed with carboxy methyl guar gum (CMGG) to form a new high temperature salt-resistant gel (SHA/CMGG) for use in fracturing fluids by crosslinking the mixture of SHA and CMGG with organic zirconium. Studies on the operational performance of fracturing fluids treated with the SHA/CMGG gel showed that the SHA/CMGG gel has better viscoelasticity and sand suspension capacity than the CMGG gel; a fracturing fluid treated with 0.3% SHA/CMGG has the best performance, the average settling velocity of sands in the fracturing fluid is 0.32 mm/min. The introduction of sulfonate ions into the humic acid molecules renders SHA/CMGG excellent salt resistance, the apparent viscosity of the SHA/CMGG treated fracturing fluid is decreased by 50% when contaminated with 1% salt. The fracturing fluid containing 0.3% SHA/CMGG has excellent high temperature and shear resistance, its viscosity, after shearing at 140 ℃ and 170 s−1, is 120 mPa·s and remains almost unchanged for 60 min. After gel breaking, the viscosity of the SHA/CMGG treated fracturing fluid and the permeability damage of cores are all increased, only with small magnitudes. Observation of the change of the microstructure of the fracturing fluid under SEM showed that SHA/CMGG gel has dense network structure which is important to the suspension of proppants in the fracturing fluid.

     

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