Tạp chí
 
Năm 2025
 
Số 66, Kỳ 6, [12 - 2025] - Tiếng Anh

Identification of well breathing phenomena in HPHT wells and technical solutions to enhance drilling efficiency in the Nam Con Son Basin

DOI:10.46326/JMES.2025.66(6).03

  • Cơ quan:

    1 Zarubezhneft EP Vietnam B.V., Vietnam
    2 Hanoi University of Mining and Geology, Hanoi, Vietnam

  • *Tác giả liên hệ:
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  • Nhận bài: 10-08-2025
  • Sửa xong: 19-10-2025
  • Chấp nhận: 13-11-2025
  • Ngày đăng: 01-12-2025
Trang: 19 - 36
Lượt xem: 26
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Lượt tải: 1
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Tóm tắt:

The Nam Con Son Basin is considered the most technically challenging area for drilling operations in Vietnam and ranks among the most complex globally. Its central region, dominated by high-temperature, high-pressure (HPHT) conditions, accounts for approximately 70÷80% of the basin’s total gas production. This area is geologically characterized by heterogeneous stratigraphy, abnormally high formation pressures and temperatures, and a narrow margin between pore pressure and fracture gradient-commonly referred to as the “narrow pressure window.” Under such conditions, even minor variations in mud weight can lead to wellbore instability or formation damage. One of the most critical drilling challenges in this environment is wellbore breathing - a transient loss and subsequent return of drilling fluid-typically observed in formations within the Miocene formation. These formations exhibit low porosity, low permeability, and elastic rock behavior, which can result in misleading well control indications, non-productive time, and potential well control incidents if not identified and managed appropriately. This study presents a novel diagnostic framework for recognizing and managing wellbore breathing in HPHT wells of the Nam Con Son Basin. It systematically evaluates operational data from recent wells using four key indicators: (i) loss circulation behavior during circulation, (ii) mud-volume return after pump stoppage, (iii) downhole pressure variations, and (iv) changes in total gas and gas-peak composition in returns. The combined indicators reliably identified early breathing onset and severity, distinguishing it from other circulation anomalies. Field validation confirmed the method’s robustness across multiple well sections. Applying the proposed framework, along with mud-weight optimization, real-time monitoring, and wellbore strengthening, reduced non-productive time and minimized well-control false alarms. These outcomes demonstrate significant practical value for improving safety, integrity, and efficiency in complex HPHT drilling environments worldwide HPHT.

Trích dẫn
Tai Trong Nguyen, Vinh The Nguyen, Richard Beaton, Thinh Van Nguyen và Tu Van Truong, 2025. Identification of well breathing phenomena in HPHT wells and technical solutions to enhance drilling efficiency in the Nam Con Son Basin, Tạp chí Khoa học kỹ thuật Mỏ - Địa chất, số 66, kỳ 6, tr. 19-36.
Tài liệu tham khảo

 Dao Q. K. (2015, 2016). Bien Dong POC End of Well reports for Hai Thach - Moc Tinh wells in block 05.2-05.3.

Tai, N.T., Khoat, L.H., Vladimir. (2015). ROSNEFT End of Well reports TTN-1X, in block 05.3/11.

Tung, T.T., Han, T.N., Thi, L.D. (2011). Well Proposals for Hai Thach - Moc Tinh and Tho Tinh Nam wells.

Baldino, S., Miska, S.Z., Ozbayoglu, E.M., Zang, J. (2019) Borehole-Breathing/Kick Dsicriminator: Diagnostic Tool and Potential Resource for In-situ Formation Characterization. SPE Drill and Compl, 34 (03): 248-267. https://doi.org/10.2118/195689-PA.

Bowman, G.R. (1989). Debate on borehole ballooning in response to Gill. Oil Gas Journal. 87 (15), 6 - 7.

Feng, Y and Gray, K. E. (2018). Numerical Modeling of Wellbore Ballooning: Linking Mud Circulation in the Wellbore and Fracture Opening/Closing in the Rock. American association of drilling engineers, AADE-18-FTCE-063, 1-7.

Gill, J. A. (1986). Charged Shales: Self-Induced Pore Pressures. SPE-14788-MS. https://doi.org/10. 2118/14788-MS.

Helstrup, O.A., Rahman, M.K., Hossain, M.M., Rahman, S.S. (2001). A Practical Method for Evaluating Effects of Fracture Charging and/or Ballooning When Drilling High Pressure, High Temperature (HPHT) Wells. SPE/IADC Drilling Conference, SPE-67780-MS, Amsterdam, Netherlands, 1-9. https://doi.org/10.2118/ 67780-MS.

Holbrook, P. (1989). Debate on borehole ballooning to explain contradictory well responses continued. Oil Gas Journal. 87 (24), 44 - 45.

Karstad, E. (1998). Analysis of Ballooning Effects During Drilling of High Pressure High Temperature Wells. European Petroleum Conference, SPE 52066-STU, 1-16. https://doi. org/10.2118/52066-STU.

ROSNEFT. (2018). End of Well reports TTN-1X - Structural and sedimentological analysis of GeoXplorer borehole images.

Silvio, B and Meng, M. (2021). Critical review of wellbore ballooning and breathing literature. Geomechanics for Energy and the Environment, 28, 1-18. https://doi.org/10.1016/j.gete.2021. 100252.

Scott, R. (2023). Geomechanical Modelling and Wellbore Stability for HTandMT Fields. Ikon.

Ward, C., Clark, R. (1998). Anatomy of a ballooning borehole using PWD. Overpressures in Petroleum Exploration; Proc. Work shop, Pau, Apr.

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