Volume 40 Issue 3
May  2023
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2023  >  40(3): 340-348
SONG Hanxuan, ZHENG Lianjie, ZHANG Shiling, et al.Mechanisms casing contamination by drilling fluids in ultra-deep well drilling[J]. Drilling Fluid & Completion Fluid，2023, 40（3）：340-348 doi: 10.12358/j.issn.1001-5620.2023.03.009
Citation: SONG Hanxuan, ZHENG Lianjie, ZHANG Shiling, et al.Mechanisms casing contamination by drilling fluids in ultra-deep well drilling[J]. Drilling Fluid & Completion Fluid，2023, 40（3）：340-348 doi: 10.12358/j.issn.1001-5620.2023.03.009
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Mechanisms Casing Contamination by Drilling Fluids in Ultra-Deep Well Drilling

doi: 10.12358/j.issn.1001-5620.2023.03.009
  • 1.

    Institute of Unconventional Oil and Gas Science and Technology, China University of Petroleum (Beijing), Beijing 102249

  • 2.

    Petrochina Research Institute of Engineering and Technology Company Limited, Beijing 100000

  • Received Date: 2022-12-16
  • Rev Recd Date: 2023-01-13
    • Available Online: 2023-07-21
  • Publish Date: 2023-05-30
    Abstract
  • By analyzing the residual rate of drilling fluids on the surfaces of casing strings in ultra-deep wells, it was ascertained that temperature is the main factor affecting the residue of drilling fluids on the surfaces of the drilling strings. In high temperature ultra-deep wells, oil-based drilling fluids are apt to lose their emulsion stability and become demulsified, turning from hydrophobic to hydrophilic. Water-based drilling fluids, on the other hand, are dewatered at elevated temperatures, turning from hydrophilic to hydrophobic. Using XRD, element analysis, SARA and FTIR methods, the components of the residues of a water-based drilling fluid and an oil-based drilling fluid commonly used were analyzed. The main components of the residues were known to be cellulose and the mixture of clay and barite particles coated with sulfonated phenolic resin for the water based drilling fluid, and asphalt and barite coated with oleic acid amide for the oil-based drilling fluid. The adsorption effect of the macromolecules in a drilling fluid on the surfaces of casing strings was calculated using molecular dynamics simulation based on the analyses of the residues in the drilling fluids. The calculation showed that the binding energy between porphyrin (the major component of asphalt) and the casing wall is -54.18 kcal/mol, the binding energy between oleic acid and the casing wall is -19.72 kcal/mol, the binding energy between cellulose and the casing wall is -19.09 kcal/mol, and the binding energy between sulfonated phenolic resin and the casing wall is -93.19 kcal/mol, respectively. These results have proved that compared with oil-based muds, the organic components in a water-based are much more adhesive at elevated temperatures. This analysis of the casing contamination by drilling fluids will provide theoretical guidance to the cleansing of casing strings in the future.

     

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