ISSN 0253-2778

CN 34-1054/N

Open AccessOpen Access JUSTC Earth and Space Sciences 02 July 2022

An analytical study on early kick detection and well control considerations for casing while drilling technology

Cite this:
https://doi.org/10.52396/JUSTC-2021-0192
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  • Author Bio:

    Said K. Elsayed is an Associate Professor with Petroleum Engineering Department, Faculty of Petroleum and Mining Engineering, Suez University, Egypt. He received his PhD degree from Texas A&M University and Suez Canal University (Through Channel System). He is interested in teaching EOR and petroleum production courses for graduate and undergraduate students, and he is active in consulting and advising the Oil & Gas industry

    Hany M. Azab is an MSc candidate at the Faculty of Petroleum and Mining Engineering, Suez University, Egypt. He is an overseas accredited IADC & IWCF well control instructor and assessor. He has over 15 years of experience in oil and gas operations. His experience in drilling and workover consulting started in 2006 after joining Weatherford Drilling International Company and progressed to drilling and workover superintendence in Agiba Petroleum Company (Eni Joint Venture Operating Company for exploring, drilling, and producing hydrocarbons in Egypt) on both onshore and offshore rigs for both oil and gas drilling and workover operations

  • Corresponding author: E-mail: Hany.AzMa@pme.suezuni.edu.eg
  • Received Date: 31 August 2021
  • Accepted Date: 17 December 2021
  • Available Online: 02 July 2022
  • Casing while drilling (CwD) technology is designed to reduce drilling time and expenses by improving the wellbore stability, fracture gradient, and formation damage while reducing the exposure time. However, for the purpose well control, the wellbore geometry and volumes differ from those obtained via a conventional drilling technique, thereby requiring a different approach. This study discusses well control principles for CwD operations. It presents a simplified method for evaluating the maximum kick tolerance and allowable well shut-in time for both conventional and CwD techniques using a mathematical model. Preliminary results revealed that the use of CwD leads to an annulus pressure loss three times higher than that observed in the conventional drilling. In addition, the kick tolerance is reduced by 50% and the maximum allowable well shut-in time is reduced by 65%, making an early kick detection system necessary.
    Casing while drilling technique and drilling problem solutions.
    Casing while drilling (CwD) technology is designed to reduce drilling time and expenses by improving the wellbore stability, fracture gradient, and formation damage while reducing the exposure time. However, for the purpose well control, the wellbore geometry and volumes differ from those obtained via a conventional drilling technique, thereby requiring a different approach. This study discusses well control principles for CwD operations. It presents a simplified method for evaluating the maximum kick tolerance and allowable well shut-in time for both conventional and CwD techniques using a mathematical model. Preliminary results revealed that the use of CwD leads to an annulus pressure loss three times higher than that observed in the conventional drilling. In addition, the kick tolerance is reduced by 50% and the maximum allowable well shut-in time is reduced by 65%, making an early kick detection system necessary.
    • The goal of the casing while drilling (CwD) technology is to drive the casing deeper as possible to close the problematic zone.
    • Drilling with casing provides a significantly different fluid flow path geometry than the conventional drilling method.
    • When using the CwD technology, kick tolerances should be carefully analyzed during the well-planning phase.

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Catalog

    Figure  1.  Conventional drilling vs. casing while drilling technology.

    Figure  2.  Conventional drilling BHA vs. casing while drilling BHA.

    Figure  3.  Drill lock assembly.

    Figure  4.  Retrievable and non-retrievable CwD BHA (modified from Ref. [3]).

    Figure  5.  Tesco’s CwD practice.

    Figure  6.  Annular space of the conventional drilling (a) versus CwD (b).

    Figure  7.  Plastering effect in the casing while drilling operation[22].

    Figure  8.  Illustration of plastering effect.

    Figure  9.  (a) Conventional drilling, and (b) CwD wellbore geometry[22].

    Figure  10.  Radial flow model.

    Figure  11.  Schematic diagram of wellbore.

    Figure  12.  Comparison between conventional and CwD methods.