Volume 38 Issue 5
Sep.  2021
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2021  >  38(5): 544-551
MA Yongle, ZHANG Yong, LIU Xiaodong, et al.A drilling fluid which inhibits formation of natural gas hydrate at low temperatures in offshore drilling[J]. Drilling Fluid & Completion Fluid，2021, 38（5）：544-551 doi: 10.12358/j.issn.1001-5620.2021.05.002
Citation: MA Yongle, ZHANG Yong, LIU Xiaodong, et al.A drilling fluid which inhibits formation of natural gas hydrate at low temperatures in offshore drilling[J]. Drilling Fluid & Completion Fluid，2021, 38（5）：544-551 doi: 10.12358/j.issn.1001-5620.2021.05.002
shu

A Drilling Fluid Which Inhibits Formation of Natural Gas Hydrate at Low Temperatures in Offshore Drilling

doi: 10.12358/j.issn.1001-5620.2021.05.002
  • 1.

    Bo-Xing Division of CNPC Offshore Engineering Company Limited, Tianjin 300451

  • 2.

    China Geological Survey Exploration Technology Institute, Langfang, Hebei 065000

  • 3.

    Drilling Engineering Division of CNPC Offshore Engineering Company Limited, Tianjin 300280

  • Received Date: 2021-04-26
  • Publish Date: 2021-09-30
    Abstract
  • A low temperature inhibitive drilling fluid was developed for use in offshore natural gas hydrate drilling to deal with several technical challenges such as low temperature in deep waters, narrow safe drilling window in shallow formations, inhibition of the formation and decomposition of gas hydrate and requirements on environment protection etc. The low temperature inhibitive drilling fluid was formulated with a gas hydrate inhibitor, which was developed by compounding the thermodynamic inhibitor KCl and a kinetic inhibitor A2, and high molecular weight additives with superior low temperature rheology stability. This drilling fluid has good rheology. The bentonite content, API filter loss and density of this drilling fluid are 2%, 4 mL and 1.07 g/cm3, respectively. It has a stable low temperature rheology: the ECD at 4 ℃ is only 0.004 g/cm3 (max.) higher than that of the drilling fluid at 25 ℃. This excellent rheological property is beneficial to the borehole wall stability and borehole cleaning in drilling the shallow formations in deep waters with narrow safe drilling windows. This drilling fluid also shows excellent performance in inhibiting the formation of gas hydrate. At 4 ℃ and 20 MPa, gas hydrate is completely inhibited in 20 h. After aging for 10 d and being contaminated with drilled cuttings, the drilling fluid still retains good inhibitive capacity, and is able to decompose the gas hydrate formed. The contents of heavy metals in the additives used to formulate the drilling fluid meet the requirements of relevant standards, the EC50 and LC50 of the drilling fluid are all greater than 30 000 mg/L, satisfying the needs of first-level environment protection in the sea area in China. The overall technical performance of this drilling fluid satisfies the technical requirements of drilling natural gas hydrate in offshore area.

     

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