Volume 42 Issue 4
Jul.  2025
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ZHANG Kun, LI Yang, MU Jianlei, et al.Performance deterioration of high temperature filtration control agents by CO2 in deep formations and mechanism analysis thereof[J]. Drilling Fluid & Completion Fluid，2025, 42（4）：494-502 doi: 10.12358/j.issn.1001-5620.2025.04.008
Citation: ZHANG Kun, LI Yang, MU Jianlei, et al.Performance deterioration of high temperature filtration control agents by CO2 in deep formations and mechanism analysis thereof[J]. Drilling Fluid & Completion Fluid，2025, 42（4）：494-502 doi: 10.12358/j.issn.1001-5620.2025.04.008
shu

Performance Deterioration of High Temperature Filtration Control Agents by CO2 in Deep Formations and Mechanism Analysis Thereof

doi: 10.12358/j.issn.1001-5620.2025.04.008
  • 1.

    China Petroleum Corporation Bohai Drilling Engineering Co., Ltd., Tianjin 300280

  • 2.

    China Petroleum Corporation Materials Procurement Center, Beijing 100029

  • 3.

    School of Petroleum Engineering, Yangtze University, Wuhan, Hubei 430000

  • Received Date: 2025-01-27
  • Rev Recd Date: 2025-03-01
  • Publish Date: 2025-07-31
    Abstract
  • In developing deep acidic gas reservoirs, CO2 invasion and contamination cause the properties of high density drilling fluids, especially their ability to control filtration rate, to remarkably deteriorate at elevated temperatures. A new method has been developed to evaluate the contamination of a drilling fluid by CO2 in laboratory, and several typical high temperature filtration control agents were evaluated at 150℃ for their ability to resist CO2 contamination. Based on the macro and micro analyses of the performance of a “filtration control agent + bentonite slurry” system, the mechanisms with which CO2 causes the performance of a filtration control agent to deteriorate were systematically studied. The results of the study show that after being contaminated by CO2, the water solubility of the sulfonate type filtration control agents SAS and SMP-III was reduced, resulting in low viscosity, poor filtration property and reduced colloidal stability of the system. Acrylonitrile filtration control agent NH4-HPAN and cellulose filtration control agent PAC-LV, on the other hand, cause the system to viscosify after being contaminated by CO2. Compared with other filtration control agents, NH4-HPAN performs much better in resisting CO2 contamination, its properties in controlling filtration rate, stabilizing colloid and maintaining good particle size distribution of the system all remain stable.

     

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