Volume 42 Issue 2
Apr.  2025
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2025  >  42(2): 180-186
XU Yi, HE Tao, WANG Jun, et al.Drilling fluid technology for the deepest vertical well in Asia – the ultra-deep well Pengshen-6[J]. Drilling Fluid & Completion Fluid，2025, 42（2）：180-186 doi: 10.12358/j.issn.1001-5620.2025.02.004
Citation: XU Yi, HE Tao, WANG Jun, et al.Drilling fluid technology for the deepest vertical well in Asia – the ultra-deep well Pengshen-6[J]. Drilling Fluid & Completion Fluid，2025, 42（2）：180-186 doi: 10.12358/j.issn.1001-5620.2025.02.004
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Drilling Fluid Technology for the Deepest Vertical Well in Asia – The Ultra-Deep Well Pengshen-6

doi: 10.12358/j.issn.1001-5620.2025.02.004

  • CCDC Drilling Fluid Technology Service Company, Chengdu, Sichuan 610051

  • Received Date: 2024-10-16
  • Rev Recd Date: 2024-12-02
  • Publish Date: 2025-04-17
    Abstract
  • Well Pengshen-6, a six-interval well with a total depth of 9,026 m, is a key exploration well deployed by the PetroChina Southwest Oil & Gasfield Company. The projected reservoir is mainly the Dengying Formation in the Sinian System. The main technical difficulties of the drilling fluid operation include: 1) a thick mudstone with strong water sensitivity in the upper part of the well, 2) coexistence of multiple pressure systems in the same open hole section, 3) poor hole cleaning in the upper extra-large hole because of low annular flow velocity, 4) drilling fluid contamination by long section of salt/gypsum formation, 5) lost circulation resulted from the coexistence of multiple pressure systems, 6) serious acid gas contamination in the well section below the Permian System and difficulties in controlling the rheology of the ultra-high density drilling fluids, 7) difficulties in controlling the rheology and sedimentation stability of the oil-based drilling fluid under ultra-high temperature ultra-high pressure (the bottom hole temperature reaches 216℃ and the bottom hole pressure reaches 150 MPa) in the ultra-deep well section, 8) the broken Dengying Formation in the Sinian System. To deal with these difficulties, three sets of drilling fluid formulations were selected through many laboratory experiments: an organic salt polymer drilling fluid with good encapsulating and inhibitive properties was used to drill the upper section of the well, an organic salt polymer-sulfonate drilling fluid with good high temperature and contamination resisting performances was used to drill the middle section of the well, and an ultra-high temperature-resistant oil-based drilling fluid with good sedimentation stability, rheological properties and cuttings-carrying capacity was used to drill the target zones. In field application of these drilling fluids, the rheology of the drilling fluid in the upper section was under control, and the wellbore was stable; the high-density water-based drilling fluid had good rheology, strong inhibitive and plugging capacities, and strong resistance to salt/calcium/CO2 contamination; the low-density oil-based drilling fluid under ultra-high temperature and ultra-high pressure had controlled rheology, good sedimentation stability and strong anti-collapse capabilities.

     

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