Volume 36 Issue 4
Aug.  2019
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CHANG Xiaofeng, SUN Jinsheng, LYU Kaihe, ZHANG Fan. Research and Application of a Novel High Temperature Filter Loss Reducer[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(4): 420-426. doi: 10.3969/j.issn.1001-5620.2019.04.004
Citation: CHANG Xiaofeng, SUN Jinsheng, LYU Kaihe, ZHANG Fan. Research and Application of a Novel High Temperature Filter Loss Reducer[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(4): 420-426. doi: 10.3969/j.issn.1001-5620.2019.04.004
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Research and Application of a Novel High Temperature Filter Loss Reducer

doi: 10.3969/j.issn.1001-5620.2019.04.004

  • School of Petroleum Engineering, China University of Petroleum, Qingdao, Shandong 266580

  • Received Date: 2019-04-15
  • Publish Date: 2019-08-30
    Abstract
  • A novel filter loss reducer PDANV has been developed with monomers such as 4-vinyl pyridine (VP), N, N-dimethyl acrylamide (DMAA), 2-acrylamide-2-methyl propane sulfonic acid (AMPS) and n-vinyl caprolactam (NVCL) through radical polymerization. Ammonium persulfate-sodium bisulfite is used as the redox initiator. The synthesized filter loss reducer can be used at temperatures as high as 260℃. The optimum polymerization conditions as determined by orthogonal experiment are as follows:nDMAA:nAMPS:nNVCL:nVP=6:2:1:1, reaction temperature 60℃, reaction time 2 h, mass of initiator is 0.5% of the total mass of the monomers (20%). The molecular structure of the polymerization product is determined with FT-IR and 1HNMR. TGA result shows that PDANV degrades at 301℃, indicating that it has very good thermal stability. Evaluation of PDANV in a water base drilling fluid shows that, at 2% concentration of PDANV, the filter loss of the drilling fluids is only 4.4 mL, and 6.0 mL after aging the drilling fluid at 260℃. The HTHP filter loss of the same drilling fluid is 24 mL. PDANV is resistant to salt contamination to saturation and calcium contamination to 20,000 mg/L. Analysis clay particle distribution, SEM analysis, Zeta potential analysis, as well as adsorption quantities of PDANV at different concentrations on clay particles further reveal the mechanisms of filter loss reduction of PDANV in water base drilling fluids.

     

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