Volume 43 Issue 4
Jul.  2026
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Li Wenzhe, Wang Rui, Wang Yao, et al.Characteristics and measures or prevention of continuous contamination by high-temperature and high-pressure CO2[J]. Drilling Fluid & Completion Fluid，2026, 43（4）：489-497 doi: 10.12358/j.issn.1001-5620.2026.04.007
Citation: Li Wenzhe, Wang Rui, Wang Yao, et al.Characteristics and measures or prevention of continuous contamination by high-temperature and high-pressure CO2[J]. Drilling Fluid & Completion Fluid，2026, 43（4）：489-497 doi: 10.12358/j.issn.1001-5620.2026.04.007
shu

Characteristics and Measures or Prevention of Continuous Contamination by High-Temperature and High-Pressure CO2

doi: 10.12358/j.issn.1001-5620.2026.04.007
  • 1.

    Oil and Gas Technology Research Institute of PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan 610017

  • 2.

    Engineering Technology Department of PetroChina Southwest Oil & Gasfield Company,Chengdu, Sichuan 610000

  • Received Date: 2026-01-07
  • Accepted Date: 2026-02-22
  • Rev Recd Date: 2026-02-16
  • Publish Date: 2026-07-30
    Abstract
  • To address the persistent contamination of drilling fluids by CO2, the CO2 contamination to drilling fluids in the Penglai gas field in the Sichuan Basin is analyzed. In laboratory simulating experiment with high-temperature high-pressure (HTHP) CO2 contamination, the characteristics of persistent HTHP CO2 contamination was understood, and a set of measures for persistent CO2 contamination prevention and treatment was developed. The experimental results show that when persistent CO2 contamination is encountered, the concentrations of contaminant ions such as CO32− and HCO3− in the drilling fluid increase, and the pH of the drilling fluid decreases. This is due to the neutralization of CO2 by the caustic bases in the drilling fluid, instead of the dissolution and ionization of the CO2 molecules in water. In the treatment of a water-based drilling fluid, continual application of caustic soda results in continuous increase in the concentrations of CO32− and HCO3− in the drilling fluid. Bentonite platelets become fine particles under the action of CO32−/HCO3−, and the fine particles tend to aggregate due to CO32−/HCO3−-mediated dipole and hydrogen-bonding actions, thereby causing the drilling fluid to become viscosified. The synergy of a calcium additive and BK519 (a thinner) can be used to effectively prevent and deal with the persistent HTHP CO2 contamination. The achievement made in this research provides a theoretical and technical support to the in-depth revealing and effective preventing of persistent CO2 contamination encountered in deep formations.

     

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