Volume 36 Issue 3
Jun.  2019
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LI Bin, JIANG Guancheng, HE Yinbo. A High Temperature Calcium Resistant Amphoteric Polymer Dispersant[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(3): 303-307. doi: 10.3969/j.issn.1001-5620.2019.03.007
Citation: LI Bin, JIANG Guancheng, HE Yinbo. A High Temperature Calcium Resistant Amphoteric Polymer Dispersant[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(3): 303-307. doi: 10.3969/j.issn.1001-5620.2019.03.007
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A High Temperature Calcium Resistant Amphoteric Polymer Dispersant

doi: 10.3969/j.issn.1001-5620.2019.03.007

  • 1. China United Coalbed Methane Corporation, Ltd., Beijing 100015;

  • 2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249;

  • 3. MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249

  • Received Date: 2019-02-11
  • Publish Date: 2019-06-30
    Abstract
  • Calcium contamination presents threats to many polymers used in drilling fluids. Dispersion and deflocculation are generally used to eliminate the detrimental effects of calcium contamination. A high temperature calcium resistant amphoteric polymer dispersant has been developed with 2-acrylamido-2-methylpropane sulfonic acid (AMPS), sodium 4-styrenesulfonate (SSS) and dimethyldiallyl ammonium chloride (DMDAAC). The key factors affecting the polymerization, through optimization, are as follows:molar ratio of the monomers AMPS:SSS:DMDAAC=7.5:0.5:2, percent mass concentration of the initiator K2S2O8 is 0.4%. Laboratory evaluation results show that this dispersant can be used to disperse bentonite in high temperature high calcium water base drilling fluids, and is able to reduce filtration rate and low-shear-rate viscosity. The mechanism of the dispersant was studied by analyzing its molecular structure. A drilling fluid resistant to contamination of high concentration calcium was formulated with the dispersant as the main additive, combined with other additives such as defoamer and inert plugging agents.

     

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