Volume 36 Issue 6
Dec.  2019
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2019  >  36(6): 706-710
TANG Lingjuan, LIU Chao, WU Weilin, WANG Min, LIU Haobing, LU Fuwei. The Environment Protection Property of a Natural Rock Asphaltene for Oil Base Drilling Fluids[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(6): 706-710. doi: 10.3969/j.issn.1001-5620.2019.06.008
Citation: TANG Lingjuan, LIU Chao, WU Weilin, WANG Min, LIU Haobing, LU Fuwei. The Environment Protection Property of a Natural Rock Asphaltene for Oil Base Drilling Fluids[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(6): 706-710. doi: 10.3969/j.issn.1001-5620.2019.06.008
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The Environment Protection Property of a Natural Rock Asphaltene for Oil Base Drilling Fluids

doi: 10.3969/j.issn.1001-5620.2019.06.008

  • 1. College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou, Hubei 434023;

  • 2. Petroleum Engineering Technology Research Institute, Jiangsu Oilfield, Yangzhou, Jiangsu 225009;

  • 3. Drilling Fluid Technology Services of CNPC Bohai Drilling Engineering Company Limited, Tianjin 300280;

  • 4. The First Drilling Branch of Sinopec Jianghan Oilfield Service Corporation, Qiangjiang, Hubei 433121

  • Received Date: 2019-08-04
  • Publish Date: 2019-12-30
    Abstract
  • To save the operation cost, some low-cost filter loss reducers such as natural rock asphalt have been used in environmentally friendly oil base drilling fluids. The environmental protection performance of these filter loss reducer has been evaluated by examining the polycyclic aromatic hydrocarbon contents and performing acute biotoxicity test. The evaluation showed that there are no carcinogenic polycyclic aromatic hydrocarbons in the natural rock asphalt. Drilled cuttings contaminated with a white oil base drilling fluid containing 3% natural rock asphalt has an EC50 of 104,751 mg/L, satisfying the environmental protection standards. Analyses of the composition of the asphalts showed that natural rock asphalts contain no low molecular weight saturates and aromatics; they contain 13.83% resins and rigid asphaltenes. All the components of the natural rock asphalt become part of the mud cakes to reduce filtrate rate. Oil base drilling fluids treated with natural rock asphalt have filtration rate that is less than 3.7 mL at 150℃ and less than 4.0 mL at 200℃. Natural rock asphalt is an environmentally friendly filter loss reducer with a stable capability of controlling the filtration rate of environment protection oil base drilling fluids.

     

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