Volume 39 Issue 4
Jul.  2022
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ZHANG Wandong, WANG Aijia, GUO Hao, et al.Development and application of comb-like polymer filter loss reducer with high temperature and high calcium contamination resistance[J]. Drilling Fluid & Completion Fluid,2022, 39(4):435-440 doi: 10.12358/j.issn.1001-5620.2022.04.006
Citation: ZHANG Wandong, WANG Aijia, GUO Hao, et al.Development and application of comb-like polymer filter loss reducer with high temperature and high calcium contamination resistance[J]. Drilling Fluid & Completion Fluid,2022, 39(4):435-440 doi: 10.12358/j.issn.1001-5620.2022.04.006

Development and Application of Comb-like Polymer Filter Loss Reducer with High Temperature and High Calcium Contamination Resistance

doi: 10.12358/j.issn.1001-5620.2022.04.006
  • Received Date: 2021-01-16
  • Accepted Date: 2021-12-25
  • Rev Recd Date: 2022-02-25
  • Publish Date: 2022-07-30
  • A comb polymer filter loss reducer, WA-1, was synthesized with different monomers in a specific ratio. Comparative experiments were designed, and the optimum reaction program selected for the synthesis reaction. Monomers used in the synthesis of WA-1 included 2-acrylamido-2-methylpropanesulfonic acid (AMPS), dimethyl diallyl ammonium chloride (DMDAAC), N-vinyl pyrrolidone (NVP) and N, N-dimethyl acrylamide (DMAA) in a mass ratio of AMPS∶DMDAAC∶NVP∶DMAA = 5∶3∶1∶1. The total concentration of the monomers was 19.8%. Potassium persulphate of 2‰ was used as the reaction initiator. The monomers were allowed to react for 5 hours at 60 ℃ and pH of 7. Evaluation of the final product has shown that WA-1 can be used at temperatures up to 180 ℃. Drilling fluids treated with WA-1 have good rheology, filtration property and calcium contamination resistance. In laboratory experiment, a base mud containing 2%CaCl2 was treated with 2%WA-1. The mud was aged at 180 ℃ for 16 hours and then tested. The API filtration rate of the mud was 11.2 mL, which was less than the filtration rate of the mud treated with linear polymers. Infrared spectroscopy characterization, thermogravimetric analysis, Zeta-potential measurement and particle size distribution analysis of drilling fluids treated with WA-1 have shown that, as a comb polymer filter loss reducer, WA-1 is able to resist the adverse effects of high temperature and high calcium, and to improve the stability of drilling fluids.

     

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