Volume 42 Issue 3
Jun.  2025
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2025  >  42(3): 324-329
LI Wenzhe, SHEN Xinyu, WANG Rui, et al.Performance and mechanisms of zwitterionic polymer modified nanoparticles in calcium resistance, plugging and filtration control[J]. Drilling Fluid & Completion Fluid，2025, 42（3）：324-329 doi: 10.12358/j.issn.1001-5620.2025.03.007
Citation: LI Wenzhe, SHEN Xinyu, WANG Rui, et al.Performance and mechanisms of zwitterionic polymer modified nanoparticles in calcium resistance, plugging and filtration control[J]. Drilling Fluid & Completion Fluid，2025, 42（3）：324-329 doi: 10.12358/j.issn.1001-5620.2025.03.007
shu

Performance and Mechanisms of Zwitterionic Polymer Modified Nanoparticles in Calcium Resistance, Plugging and Filtration Control

doi: 10.12358/j.issn.1001-5620.2025.03.007
  • 1.

    Engineering Research Institute, petrochina Southwest Oil & Gas Field Company, Chengdu, Sichuan 610017

  • 2.

    Science and Technology Department, petrochina Southwest Oil and Gas Field Company, Chengdu, Sichuan 610000

  • 3.

    Pipe Tools and Well Control Technical Service Branch, petrochina West Drilling Engineering Co., LTD., Karamay, Xinjiang 834000

  • 4.

    Engineering Technology Department, petrochina Southwest Oil and Gas Field Company, Chengdu, Sichuan 610000

  • Received Date: 2025-01-16
  • Rev Recd Date: 2025-02-23
  • Publish Date: 2025-06-12
    Abstract
  • A high temperature calcium resistant plugging agent ZP-NPs has been developed based on the “anti-polyelectrolyte effect” theory to render water based drilling fluids high temperature stability, high calcium resistance and good plugging capacity. ZP-NPs is obtained by grafting zwitterionic polymer molecules onto the surfaces of nano silica. The microstructure of ZP-NPs was observed using infrared spectrum and electroscope, and the performance of ZP-NPs evaluated through dispersion test, filtration test and plugging test. It was found in these tests that ZP-NPs can stably disperse to nanoparticles/submicron particles for a long time in a high temperature high calcium chloride concentration (160℃, 11%CaCl2) solution. A base slurry, after being contaminated by high concentration calcium ions, has a high temperature high pressure (160℃, 3.5 MPa) filtration rate that does not exceed 20 mL, and the mud cakes obtained from the test are thin and tough. Fractures of 5 μm in width plugged by a bentonite slurry treated with ZP-NPs can stand pressures up to 5.5 MPa. The calcium resistant performance, plugging capacity and filtration control property of ZP-NPs were revealed through particle size analysis and EDS, and it was found that ZP-NPs has strong “anti-polyelectrolyte” effect; at high calcium concentrations, the particle sizes of ZP-NPs are still in nanometer size range, they can effectively shield the bentonite particles against the adsorption of calcium ions, thus maintaining the dispersion stability and excellent filtration control performance of a bentonite slurry at high calcium concentrations. This study provides a new theoretical and technical guidance for the development of new plugging agents with good calcium resistant capacity.

     

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