Casing point selection for drilling operations at shallow depths

Amir Saman Paknejad, Jerome J. Schubert, Mahmood Amani

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In shallow sediments, unlike deep sediments with elastic behavior, the failure mechanism of the casing shoe is strongly affected by the plasticity of the rock. Hence, the common practice in casing design which is based on using the pore pressure and fracture pressure gradients plots is not applicable in shallow sediments. Moreover, because of the plastic behavior of the sediments, the interpretation of Leak-Off Tests (LOT) in Shallow Marine Sediments (SMS) could be inconclusive. Therefore, because of uncertainties in prediction of formation fracture and pore gradients, the conductor and surface casing setting depths have always been subject to debate.1, 2 Also, incorrect interpretation of LOT would lead to costly problems that might jeopardize well progress such as; well control issues, unnecessary squeeze jobs, premature setting of casing, and lost circulation problems. Two of the most important factors in any design are safety and cost. Since safety is one of the most important concerns during drilling an offshore well, planning a design based on the well control aspects would be an appropriate approach to come up with a safe and better design.3-4 A well control simulator was used to plan for well control situations. In this paper, the results were generalized for different design scenarios and a simple design method is presented. Also, a new method, supported by field data from LOT in SMS, is presented to accurately analyze casing shoe leak-off pressure in the SMS.

Original languageEnglish
Title of host publicationProceedings of the 28th International Conference on Ocean, Offshore and Arctic Engineering 2009, OMAE2009
Pages547-558
Number of pages12
Volume7
DOIs
Publication statusPublished - 2009
Event28th International Conference on Ocean, Offshore and Arctic Engineering, OMAE2009 - Honolulu, HI, United States
Duration: 31 May 20095 Jun 2009

Other

Other28th International Conference on Ocean, Offshore and Arctic Engineering, OMAE2009
CountryUnited States
CityHonolulu, HI
Period31/5/095/6/09

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ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Ocean Engineering
  • Mechanical Engineering

Cite this

Paknejad, A. S., Schubert, J. J., & Amani, M. (2009). Casing point selection for drilling operations at shallow depths. In Proceedings of the 28th International Conference on Ocean, Offshore and Arctic Engineering 2009, OMAE2009 (Vol. 7, pp. 547-558) https://doi.org/10.1115/OMAE2009-79836