Volume 42 Issue 4
Jul.  2025
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2025  >  42(4): 472-477
WU Wenbing, ZHONG Jie, LIU Tao, et al.An environmentally friendly ultra-high temperature low solids seawater-based drilling fluid[J]. Drilling Fluid & Completion Fluid，2025, 42（4）：472-477 doi: 10.12358/j.issn.1001-5620.2025.04.005
Citation: WU Wenbing, ZHONG Jie, LIU Tao, et al.An environmentally friendly ultra-high temperature low solids seawater-based drilling fluid[J]. Drilling Fluid & Completion Fluid，2025, 42（4）：472-477 doi: 10.12358/j.issn.1001-5620.2025.04.005
shu

An Environmentally Friendly Ultra-High Temperature Low Solids Seawater-Based Drilling Fluid

doi: 10.12358/j.issn.1001-5620.2025.04.005
  • 1.

    School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580

  • 2.

    CNPC Offshore Engineering Co., Ltd., Tianjin 300074

  • Received Date: 2025-01-21
  • Rev Recd Date: 2025-02-23
  • Publish Date: 2025-07-31
    Abstract
  • The failure of a drilling fluid at high temperatures is one of the main causes of complex downhole accidents. The depths of wells around the Bohai Bay are close to 6,000 m, and the bottom hole temperatures are expected to exceed 200℃. To prevent wellbore collapse and the failure of the drilling fluids, protect the oil and gas reservoirs and the marine environment, high-temperature resistant drilling fluid additives were optimally selected, the high-temperature resistance mechanisms of the additives were explored, and as a result of these researches, an environmentally friendly ultra-high temperature low-solids seawater-based drilling fluid with a temperature resistance of 200℃ and a density of 1.9 g/cm3 was formulated and applied in the well Gaitan-1. The research results and field application effects show that after hot rolled at 200℃ for 16 hours, the filtration rate of this drilling fluid is only 15 mL. It has many advantages such as low filtration rate, high inhibitive capacity, good lubricity, good suspending and carrying capacity, as well as reservoir protection capability. The well was drilled successfully, the rate of wellbore enlargement was small, and the composition of the drilling fluid was simple and environmentally friendly, satisfying the requirements of marine environmental protection. This drilling fluid has helped solve the technical difficulties encountered in oil and gas drilling in deep high-temperature and high-pressure formations in the Bohai Sea area, providing technical support for the exploration and development of deep oil and gas in this area in the future, and also providing a sample for the application of ultra-high temperature low-solids drilling fluids in other deep formations and environmentally sensitive areas.

     

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