Volume 35 Issue 6
Nov.  2018
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YANG Lili, YANG Xiao, JIANG Guancheng, SHI Yawei, WANG Tengda. A High Temperature Calcium Resistant Filter Loss Reducer Containing Ionic Liquid Segments[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(6): 8-14. doi: 10.3969/j.issn.1001-5620.2018.06.002
Citation: YANG Lili, YANG Xiao, JIANG Guancheng, SHI Yawei, WANG Tengda. A High Temperature Calcium Resistant Filter Loss Reducer Containing Ionic Liquid Segments[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(6): 8-14. doi: 10.3969/j.issn.1001-5620.2018.06.002
shu

A High Temperature Calcium Resistant Filter Loss Reducer Containing Ionic Liquid Segments

doi: 10.3969/j.issn.1001-5620.2018.06.002

  • 1. School of Petroleum Engineering, China University of Petroleum, Beijing 102249;

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

  • Received Date: 2018-11-05
  • Publish Date: 2018-11-30
    Abstract
  • High temperature and calcium contamination are always encountered in deep well and ultra-deep well drilling. To address the high filtration rate problem caused by high temperature and calcium contamination, PASV, a high temperature calcium resistant filter loss reducer has been developed with bromide salt of 1-vinyl-3-ethyl imidazole (VeiBr), which is a high temperature stable ionic liquid, 2-acrylamido-2-methylpropane sulfonic acid (AMPS), which is a calcium resistant chemical, and acrylamide (AA) in an optimized mass ratio of VeiBr:AA:AMPS=0.53:1:2, at which the reaction product (PASV) has the best filtration control capacity. In laboratory experiment, PASV showed excellent property at high temperatures; it began to decompose at 290℃, satisfying the needs of drilling at almost all temperature conditions. A drilling fluid sample containing 40,000 mg/L calcium ions had its filtration rates before and after aging at 150℃ reduced to 5.2 mL and 8.6 mL, respectively when treated with 2% PASV, indicating that PASV has excellent filtration control ability. Mechanisms of PASV as a filter loss reducer demonstrated that PSAV molecules are adsorbed on the surface of clay particles through ionic bond and hydrogen bond, thereby shielding the electric neutralization and flocculation of clay particles by Ca2+ ions. The adsorption of PASV molecules on the surface of clay particles promots the dispersion of clay particles and improves the quality of mud cakes, hence to reduce filtration rate.

     

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