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Prediction Method for Annular Pressure with Percolation under Solid Phase Deposition in Deepwater Wells of the South China Sea
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Yi WU1, 2, Xing-quan ZHANG1, 2, Tian-wei ZHANG1, 2, Zhi ZHANG3, Jian DING3, 4, *
Science Technology and Engineering | 2025, 25(20) : 8483 - 8489
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Science Technology and Engineering | 2025, 25(20): 8483-8489
• Papers·Petroleum and Natural Gas Industry •
Prediction Method for Annular Pressure with Percolation under Solid Phase Deposition in Deepwater Wells of the South China Sea
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Yi WU1, 2, Xing-quan ZHANG1, 2, Tian-wei ZHANG1, 2, Zhi ZHANG3, Jian DING3, 4, *
Affiliations
  • 1 CNOOC (China) Co., Ltd. Beijing Research Center, Beijing 100000, China
  • 2 National Key Laboratory of Offshore Oil and Gas Exploitation, Beijing 100000, China
  • 3 State Key Laboratory of Oil and Gas Reservoir Geology and Development Engineering, Southwest Petroleum University, Chengdu 610500, China
  • 4 School of Mechanical Engineering, Southwest Petroleum University, Chengdu 610500, China
Published: 2025-07-18 doi: 10.12404/j.issn.1671-1815.2406499
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To mitigate the risk of annular pressure buildup caused by solid-phase deposition in the B and C annuli of deep-water wells, experimental tests were conducted on sedimentation behavior using common deep-water drilling fluid systems. The sedimentation height and post-settling solid-phase permeability of various drilling fluids were measured. Based on the parameters of solid phase percolation characteristics, and considering the impact of annular fluid solid deposition, a predictive analytical method was established for annular pressure under percolation conditions. Case analysis was conducted to validate the approach. Results show that the sedimentation height follows the order: oil-based drilling fluid > EZFLOW drilling fluid > HEM drilling fluid. In contrast, the post-settling solid-phase permeability is ranked as EZFLOW drilling fluid > HEM drilling fluid > oil-based drilling fluid, with a maximum permeability of 2.216 μm2. Under annular fluid solid-phase deposition conditions, reductions in annular fluid viscosity, increases in formation permeability, and longer open-hole cement sheath sections reduce fluid viscous resistance, enlarge the seepage contact area with the formation, and enhance fluid flow. Therefore, reducing drilling fluid viscosity and extending the open-hole cement sheath length can improve the pressure release capacity in the B and C annuli of deep-water wells. However, the presence of solid-phase deposition significantly restricts seepage flow rates compared to conditions without deposition, leading to a potential risk of incomplete pressure relief following solid-phase sedimentation.

deep wells  /  annular pressure  /  annulus fluid  /  solid phase deposition  /  seepage
Yi WU, Xing-quan ZHANG, Tian-wei ZHANG, Zhi ZHANG, Jian DING. Prediction Method for Annular Pressure with Percolation under Solid Phase Deposition in Deepwater Wells of the South China Sea[J]. Science Technology and Engineering, 2025 , 25 (20) : 8483 -8489 . DOI: 10.12404/j.issn.1671-1815.2406499
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Year 2025 volume 25 Issue 20
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Article Info
doi: 10.12404/j.issn.1671-1815.2406499
  • Receive Date：2024-08-29
  • Online Date：2026-05-13
  • Published：2025-07-18
Article Data
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History
  • Received：2024-08-29
  • Revised：2025-04-25
Funding
Affiliations
    1 CNOOC (China) Co., Ltd. Beijing Research Center, Beijing 100000, China
    2 National Key Laboratory of Offshore Oil and Gas Exploitation, Beijing 100000, China
    3 State Key Laboratory of Oil and Gas Reservoir Geology and Development Engineering, Southwest Petroleum University, Chengdu 610500, China
    4 School of Mechanical Engineering, Southwest Petroleum University, Chengdu 610500, China
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