Volume 42 Issue 5
Sep.  2025
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2025  >  42(5): 696-704
ZOU Jun, HAO Shaojun, HAO Tian, et al.Development of high-temperature-resistant and high-density QH-HCF completion fluid system and its application in deep and ultra-deep wells[J]. Drilling Fluid & Completion Fluid，2025, 42（5）：696-704 doi: 10.12358/j.issn.1001-5620.2025.05.017
Citation: ZOU Jun, HAO Shaojun, HAO Tian, et al.Development of high-temperature-resistant and high-density QH-HCF completion fluid system and its application in deep and ultra-deep wells[J]. Drilling Fluid & Completion Fluid，2025, 42（5）：696-704 doi: 10.12358/j.issn.1001-5620.2025.05.017
shu

Development of High-Temperature-Resistant and High-Density QH-HCF Completion Fluid System and Its Application in Deep and Ultra-Deep Wells

doi: 10.12358/j.issn.1001-5620.2025.05.017
  • 1.

    Oil & Gas Process Research Institute, CNPC Qinghai Oilfield Branch, Dunhuang, Gansu 736202

  • 2.

    Research Institute of Exploration and Development of PetroChina Qinghai Oilfield Company, Dunhuang, Gansu 736202

  • Received Date: 2025-04-05
  • Rev Recd Date: 2025-05-18
  • Publish Date: 2025-09-30
    Abstract
  • Addressing the poor suspension stability, rheological deterioration and reservoir damage exhibited by conventional completion fluids in deep and ultra-deep well drilling and completion operations under high-temperature (>200℃) and high-density (>2.0 g/cm3) conditions, this study employs molecular design to develop a high-temperature suspending agent, QH-HSA-III, and uses it as the core to build a novel QH-HCF completion fluid system. QH-HSA-III is synthesized via a terpolymer modification strategy of acrylamide (AM), octadecyl acrylate (ODA) and N-isopropylacrylamide (NIPAM). Through hydrophobic association and thermoresponsive mechanisms, it forms a dynamic three-dimensional network at elevated temperatures, markedly enhancing suspension stability. Laboratory evaluations show that the QH-HCF system maintains an apparent viscosity of 60 mPa·s at 200℃ with a dynamic shear force to plastic viscosity ratio of 0.26. In a 15-day high-temperature settling test, water separation was only 0.3%, cuttings rolling recovery reached 98.5%, particle-size retention was 93.8%, and high-temperature/high-pressure filtration loss remained ≤ 15 mL. In field trials on Well K2-X1 (measured depth 7182 m, bottom-hole temperature 200℃), application of the QH-HCF system reduced circulating pressure loss by 31.8%, achieved a cuttings return rate in excess of 95%, and cut non-productive time by 67%.These results confirm that the QH-HCF completion fluid system delivers outstanding high-temperature stability, dynamic rheological control and reservoir protection, providing robust technical support for the safe and efficient development of deep and ultra-deep wells.

     

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