Volume 43 Issue 1
Feb.  2026
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HUANG Shengming, JIANG Guancheng, JIAO Qingli, et al.Preparation of fracturing fluids with viscoelastic surfactants and its adsorption/desorption properties on shale gas[J]. Drilling Fluid & Completion Fluid，2026, 43（1）：120-129 doi: 10.12358/j.issn.1001-5620.2026.01.016
Citation: HUANG Shengming, JIANG Guancheng, JIAO Qingli, et al.Preparation of fracturing fluids with viscoelastic surfactants and its adsorption/desorption properties on shale gas[J]. Drilling Fluid & Completion Fluid，2026, 43（1）：120-129 doi: 10.12358/j.issn.1001-5620.2026.01.016
shu

Preparation of Fracturing Fluids With Viscoelastic Surfactants and Its Adsorption/Desorption Properties on Shale Gas

doi: 10.12358/j.issn.1001-5620.2026.01.016
  • 1.

    State Key Laboratory of Oil and Gas Resources and Exploration (China University of Petroleum (Beijing), Beijing 102249

  • 2.

    College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102249

  • 3.

    National Engineering Research Centre for Oil and Gas Drilling and Completion Technology, Beijing 102206

  • 4.

    Bohai Drilling and Exploration Engineering Company Limited, Downhole Technical Services Branch, PetroChina Group, Tianjin 300283

  • 5.

    College of Science, China University of Petroleum (Beijing), Beijing 102249

  • Received Date: 2025-07-13
  • Accepted Date: 2025-10-10
  • Rev Recd Date: 2025-09-25
    • Available Online: 2026-02-09
  • Publish Date: 2026-02-09
    Abstract
  • Aiming at the problems of poor sand-carrying capacity, high residue after breaking the hydroxypropyl guanidine gel (HPG) fracturing fluid, and great damage to the reservoir, an Zwitterionic surfactant, erucic acid amidopropyl hydroxysulfobetaine (EAPHS), was synthesized, and a Viscoelastic Surfactant (VES) system was prepared by optimizing the ratio of the VES system to the counter-ionic salt, sodium salicylate (NaSal). The viscosity of the VES fracturing fluid system was 34 mPa-s after constant shear for 60 min at 120℃ and 170 s−1, with excellent anti-shear performance, the drag reduction efficiency of the system was 63.1%, and the damage rate to the core was only 7.34%, which indicated that the VES fracturing fluid system had a better reservoir protection effect, and was able to effectively reduce the secondary damage to the reservoir after fracturing. It shows that the VES fracturing fluid system has good reservoir protection effect and can effectively reduce the secondary damage to the reservoir after fracturing. After VES fracturing fluid treatment, the microfractures of the core increased and the pore connectivity was enhanced, the wettability of the core surface was reversed from oleophilic to hydrophilic, and the nitrogen adsorption, specific surface area and pore volume of the core increased, which is conducive to methane desorption and exploitation, and under the same equilibrium pressure conditions, the methane desorption volume increased significantly after VES fracturing fluid treatment. The VES fracturing fluid system was applied in the field of Ningye X-1 well in the Sichuan Basin, and the pressure was smooth during the construction process, and the gas production rate was increased by more than 15%, which achieved better application results. This study provides guidance and reference value for the subsequent construction of VES fracturing fluid system and the efficient development of shale gas.

     

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