Volume 42 Issue 6
Dec.  2025
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LI Huaike, WANG Zhiyong, ZHANG Yufei, et al.A comb polymer for dispersing micro-manganese weighting material[J]. Drilling Fluid & Completion Fluid，2025, 42（6）：829-835 doi: 10.12358/j.issn.1001-5620.2025.06.016
Citation: LI Huaike, WANG Zhiyong, ZHANG Yufei, et al.A comb polymer for dispersing micro-manganese weighting material[J]. Drilling Fluid & Completion Fluid，2025, 42（6）：829-835 doi: 10.12358/j.issn.1001-5620.2025.06.016
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A Comb Polymer for Dispersing Micro-Manganese Weighting Material

doi: 10.12358/j.issn.1001-5620.2025.06.016
  • 1.

    Oilfield Chemicals R & D Institute, COSL, Yanjiao, Hebei 065201

  • 2.

    School of Chemistry and Chemical Engineering , Shandong University, Jinan, Shandong 250100

  • Received Date: 2025-05-25
  • Rev Recd Date: 2025-07-03
    • Available Online: 2025-12-08
  • Publish Date: 2025-12-08
    Abstract
  • To ensure the dispersion of micro-manganese weighting material in a completion fluid, comb polymer dispersants PSH of different compositions were developed using sodium methacrylate and methyl allyl polyoxyethylene ether through free radical polymerization. The molecular structure of the copolymer was determined by infrared spectroscopy and nuclear magnetic resonance. The effects of the dispersants of different compositions on the rheology and settlement stability of a completion fluid were investigated. Based on these researches the mechanism with which the polymer dispersants disperse the micro-manganese weighting material was presented. It was found that the sodium methacrylate-methyl allyl polyoxyethylene ether copolymers can well disperse the micro-manganese weighting agent. The dispersants PSH2, PSH3 and PSH4 all have good thinning effect on micro-manganese slurries. Of these dispersants, the dispersant PSH3, after aging at 210℃, had viscosity reduction rate of 46.7%. When added into a completion fluid, the settlement factor of the completion fluid was reduced from 0.5290, which is the settlement factor of the blank completion fluid group, to 0.5096. If the content of the methyl allyl polyoxyethylene ether monomer in the dispersant is appropriate, the best dispersion effect can be achieved.

     

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