Advertisement

Arabian Journal for Science and Engineering

, Volume 44, Issue 12, pp 10409–10419 | Cite as

Influence of Gas Migration on the Sustained Casing Pressure (SCP) of Subsea Wellhead in Deepwater Wells

  • Jing ZengEmail author
  • Deli GaoEmail author
  • Yanbin Wang
  • Jun Fang
Research Article - Petroleum Engineering
  • 24 Downloads

Abstract

SCP is one of the significant factors affecting the integrity of subsea wellhead in deepwater wells. In this paper, a new model has been established for predicting the SCP in multilayer casings based on the Darcy percolation flow model and the pressure–volume–temperature equation of state, in which the effect of inter-coupling compression of multilayer casing and volume change of annulus and casing has been considered. An iterative calculation computer program is coded for solving the model. On this basis, the influence of the gas migration parameters, the casing program, the physical properties of fluid in the annulus, and the cement permeability on the SCP is discussed, respectively. Analysis results show that the gas migration has a significant influence on the SCP, which indicates that the importance of the cement sealing performance to the integrity of subsea wellhead. In particular, the gas migration would cause the SCP increase at the beginning and then tend to be stable finally. The increase in the cement permeability, fluid density, or cement top can decrease the time when SCP reaches to stability. On the contrary, the high fluid bulk modulus can increase the time. Casing deformation provided additional annular space for gas migration, the calculation results agree well with field data, and the study provides guidance for the casing program design, the cement job, and the prediction and control of the wellbore integrity in deepwater wells.

Keywords

Deepwater wells Wellbore integrity Sustained casing pressure Gas migration Casing deformation 

Notes

Acknowledgements

The authors gratefully acknowledge the financial support from the Natural Science Foundation of China (Grant Number: 51474230). This research is also supported by other projects (Grant Numbers: U1762214, 51521063, 2017ZX05009-003 and 2016YFC0303303).

References

  1. 1.
    Bourgoyne A.T.; Scott S.L.; Regg J. B.: Sustained casing pressure in offshore producing wells. In: Offshore Technology Conference, Houston, Texas (1999)Google Scholar
  2. 2.
    Kinik K.; Wojtanowicz A.K.: Identifying environmental risk of sustained casing pressure. In: SPE Americas E&P Health, Safety, Security, and Environmental Conference, 21–23 March, Houston, Texas (2011)Google Scholar
  3. 3.
    Wojtanowica A.K.; Nikshikawa S.; Rong X.: Diagnosis and remediation of sustained casing pressure in wells. LSU report submitted to MMS (2011)Google Scholar
  4. 4.
    Kupresan, D.; Heathman, J.; Radonjic, M.: Casing expansion as a promising solution for microannular gas migration. SPE Drill. Compl. 27(5), 366–371 (2014)CrossRefGoogle Scholar
  5. 5.
    Demirci, E.; Wojtanowicz, A.K.: Pilot size process visualization: gravity fluid displacement method to stop annular gas migration. J. Nat. Gas Sci. Eng. 29, 223–231 (2016)CrossRefGoogle Scholar
  6. 6.
    Obodozie I.E.; Trahan S.J.; Joppe L.C.: Eliminating sustained casing pressure in well abandonment. In: Offshore Technology Conference Asia, Kuala Lumpur, Malaysia (2016)Google Scholar
  7. 7.
    Zhang, Z.; Zeng, W.; Peng, X.L.; et al.: Mechanism study on sustained casing pressure caused by gas migration in annulus. Drill. Prod. Technol. 37(3), 39–41 (2014). (in Chinese) Google Scholar
  8. 8.
    Xu R.; Wojtanowicz A.K.: Diagnosis of sustained casing pressure from bleed-off/buildup testing patterns. In: SPE Production Operations Symposium, Oklahoma City, Oklahoma (2001)Google Scholar
  9. 9.
    Peng, J.Y.; Zhou, L.Z.; Ruan, Y.; et al.: Risk evaluation of high-pressure gas wells in the Kela-2 gas field. Nat. Gas. Ind. 28(10), 110–112 (2008). (in Chinese) Google Scholar
  10. 10.
    Zhu, H.; Lin, Y.; Zeng, D.; et al.: Calculation analysis of sustained casing pressure in gas wells. Petrol. Sci. 9(1), 66–74 (2012)CrossRefGoogle Scholar
  11. 11.
    Zhang, B.; Guan, Z.; Zhang, Q.; et al.: Prediction of sustained annular pressure and the pressure control measures for high pressure gas wells. Petrol. Explor. Dev. 42(4), 567–572 (2015)CrossRefGoogle Scholar
  12. 12.
    Jr. Vargo R.F.; Payne M.; Faul R. et al.: Practical and successful prevention of annular pressure buildup on the marlin project. In: SPE Annual Technical Conference and Exhibition, 29 September–2 October, San Antonio, Texas (2002)Google Scholar
  13. 13.
    Milanovic D.; Smith L.: A case history of sustainable annulus pressure in sour wells-prevention, evaluation and remediation. In: SPE High Pressure/High Temperature Sour Well Design Applied Technology Workshop, The Woodlands, Texas (2005)Google Scholar
  14. 14.
    Tao Q.; Checkai D.; Bryant S.L.: Permeability estimation for large-scale potential CO2 leakage paths in wells using a sustained-casing-pressure model. In: SPE International Conference on CO2 Capture, Storage, and Utilization, New Orleans, Louisiana (2010)Google Scholar
  15. 15.
    Shadravan, A.; Schubert, J.; Amani, M.; et al.: Using fatigue-failure envelope for cement-sheath-integrity evaluation. SPE Drill. Complet. 30(1), 68–75 (2015)CrossRefGoogle Scholar
  16. 16.
    Xu, R.; Wojtanowica, A.K.: Pressure buildup test analysis in wells with sustained casing pressure. J Nat. Gas Sci. Eng. 38, 608–620 (2017)CrossRefGoogle Scholar
  17. 17.
    Zhu, D.J.: Research on Mechanism of Sustained Casing Pressure in Gas Wells. Southwest Petroleum University, Chengdu (2014). (in Chinese) Google Scholar
  18. 18.
    Rochavaladez, T.; Mentzer, R.A.; Hasan, A.R.; et al.: Inherently safer sustained casing pressure testing for well integrity evaluation. J. Loss Prevent. Proc. 29(1), 209–215 (2014)CrossRefGoogle Scholar
  19. 19.
    Goodwin, K.J.; Crook, R.J.: Cement sheath stress failure. SPE Drill. Eng. 7(4), 291–296 (1992)CrossRefGoogle Scholar
  20. 20.
    Chu, W.; Shen, J.Y.; Yang, Y.F.; et al.: Calculation of micro-annulus size in casing-cement sheath-formation system under continuous internal casing pressure change. Pet. Explor. Dev. 42(3), 414–421 (2015)CrossRefGoogle Scholar
  21. 21.
    Shen, J.Y.; Shi, L.; Li, Y.; et al.: Analysis and perspective of cement sheath integrity under a high differential pressure. Nat. Gas. Ind. 37(4), 98–108 (2017). (in Chinese) Google Scholar
  22. 22.
    Oudeman, P.; Kerem, M.: Transient behavior of annular pressure build-up in HP/HT wells. SPE Drill. Complet. 21(04), 234–241 (2006)CrossRefGoogle Scholar
  23. 23.
    Deng, Y.Z.; Chen, P.; Zhang, H.L.: Calculating the pressure in sealed annulus in oil well by iterative method. Offshore Oil 26(2), 93–96 (2006). (in Chinese) Google Scholar
  24. 24.
    Wang, S.P.; Li, Z.P.; Chen, P.; et al.: A model for prevention of casing additional load from high temperature. Nat. Gas. Ind. 27(09), 84–86 (2007). (in Chinese) Google Scholar
  25. 25.
    Che, Z.A.; Zhang, Z.; Shi, T.H.; et al.: Mechanism of annular fluid thermal expansion pressure in HTHP sour gas wells. Nat. Gas. Ind. 30(2), 88–90 (2010). (in Chinese) Google Scholar

Copyright information

© King Fahd University of Petroleum & Minerals 2019

Authors and Affiliations

  1. 1.Guangzhou Marine Geological SurveyGuangzhouChina
  2. 2.MOE Key Laboratory of Petroleum EngineeringChina University of PetroleumBeijingChina

Personalised recommendations