Volume 38 Issue 4
Jul.  2021
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LIU Fengbao, YAN Lili, NI Xiaoxiao, et al.Preparation and plugging performance of zwitterionic polymer gel micro spheres[J]. Drilling Fluid & Completion Fluid,2021, 38(4):435-441 doi: 10.12358/j.issn.1001-5620.2021.04.006
Citation: LIU Fengbao, YAN Lili, NI Xiaoxiao, et al.Preparation and plugging performance of zwitterionic polymer gel micro spheres[J]. Drilling Fluid & Completion Fluid,2021, 38(4):435-441 doi: 10.12358/j.issn.1001-5620.2021.04.006

Preparation and Plugging Performance of Zwitterionic Polymer Gel Micro Spheres

doi: 10.12358/j.issn.1001-5620.2021.04.006
  • Received Date: 2021-02-11
    Available Online: 2023-11-09
  • Publish Date: 2021-07-31
  • A kind of zwitterionic polymer gel micro spheres have been prepared through suspension polymerization to address the deficiency of plugging capacity of oil based drilling fluids. The raw materials used in the polymerization include N , N -dimethyl acrylamide (DAM), 2-acrylamido-2-methyl propane sulfonic acid (AMPS) and dimethyl diallyl ammonium chloride (DMDAAC), and the crosslinking agent for the polymerization reaction is N , N -methylene-bis-acrylamide (MBA). Using H-NMR spectrometry, the molecular structure of the polymer gel micro spheres was characterized. Effect of the molar ratio of the monomers and the concentrations of the crosslinking agent and emulsifier on the size distribution and plugging performance of the polymer gel spheres was investigated. The optimum molar ratio of the monomers for the polymerization was determined as: DAM∶AMPS∶DMDAAC = 7∶1∶2, the optimum mass concentration of MBA (based on the total mass of the monomers) was 0.2%, and the optimum concentration of the emulsifier (based on the total mass of the monomers) was 3%. The average particle size of the polymer gel micro spheres is about 22 μm. The plugging capacity of the polymer gel micro spheres was tested in oil based muds, and it was found that the polymer gel micro spheres are suitable very well to use in the oil based muds. At 150 ℃, the polymer gel micro spheres can effectively plug fractures of 5-150 μm, a plugging performance better than the combination of oxidized asphalt and fine calcium carbonate. The test results show that the zwitterionic polymer gel micro spheres are a high-performance millimeter-sized plugging agent with good field application potential.

     

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