Volume 40 Issue 5
Dec.  2023
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LIN Hai, ZHANG Chengjuan, ZHAO Wenkai, et al.Preparation and properties of viscosification and drainage integrated polymer dispersion[J]. Drilling Fluid & Completion Fluid，2023, 40（5）：678-684 doi: 10.12358/j.issn.1001-5620.2023.05.019
Citation: LIN Hai, ZHANG Chengjuan, ZHAO Wenkai, et al.Preparation and properties of viscosification and drainage integrated polymer dispersion[J]. Drilling Fluid & Completion Fluid，2023, 40（5）：678-684 doi: 10.12358/j.issn.1001-5620.2023.05.019
shu

Preparation and Properties of Viscosification and Drainage Integrated Polymer Dispersion

doi: 10.12358/j.issn.1001-5620.2023.05.019
  • 1.

    Drilling and Production Technology Research Institute, PetroChina Qinghai Oilfield Company, Dunhuang, Gansu 736202

  • 2.

    Unconventional Petroleum Research Institute, China University of Petroleum (Beijing), Beijing 102249

  • Received Date: 2023-03-20
  • Accepted Date: 2023-04-01
  • Rev Recd Date: 2023-04-01
  • Publish Date: 2023-12-25
    Abstract
  • Rapid dissolution and salt-tolerance polymers are the key products for effective utilization of highly mineralized formation water and backflow water. The integration of viscosification and drainage is the main research direction of thickeners. A weak hydrophobic association polymer was designed and synthesized, and an integrated dispersing fluid with the properties of viscosification and drainage was optimized. The overall performance of fracturing fluid was evaluated. The polymer dispersion can meet the online preparation requirements using 194 557.93 mg/L ultra-high mineralized water, and the viscosity can be adjusted from 2 to 106 mPa·s when the amount of salt-resistant thickener was 0.1-1.2%. The surface tension of breaking fluid was less than 27 mN/m when the amount of dispersion was greater than 0.4%.At 90 ℃, under shearing for 1h, the viscosity of the integrated fracturing fluid was greater than 50 mPa·s. The viscosity of 1.0% polymer dispersion was about 4 mPa·s under 80 ℃ water bath for 2 h. When the amount of polymer dispersion was 0.1%, the drag reduction rate of fracturing fluid was greater than 65%. The polymer dispersion can meet the requirements of mixing ultra-high salinity formation water and flowback fluid, realize the integration of online viscosity change and drainage, greatly reduce the cost of fracturing fluid, and simplify the on-site liquid mixing process, so it has a wide application prospect.

     

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