Application of Casing Drilling Technology in the Project N on the North Sea Shelf

Polina Gamayunova

Research output: ThesisMaster's Thesis


Gas production has been an important source of energy for humanity for over than 100 years. Due to the depletion of conventional and onshore Natural Gas fields engineers started to look for additional sources of hydrocarbons. One of regions which contain considerable amounts of Natural Gas resources is the North Sea. The shelf of the North Sea is a perspective region for Hydrocarbon development. However, it has a major amount of difficulties associated with drilling and production. Different technologies are used in the North Sea region to avoid or overcome problems which can occur during the process of drilling and production. Casing while Drilling (CwD) is one of technological solutions which are applied during drilling in this particular region. It has a number of benefits which ensure the expediency and profitability of application of this technology. Some of these profits are: reduction of Non-Productive Time (NPT), reduction of cost of drilling, occurrence of plastering effect, increased borehole stability and more. This work shows the case where Casing Drilling technology was applied for drilling surface casing section on a well, located on the North Sea shelf. Number of challenges were observed in similar intervals during drilling offset wells. These challenges include: potential clay balling, potential swelling formations, losses of drilling mud in the loose sands upper part of the North Sea group, “gumbo attacks” and over-pull on connections and trips. Considering all the data and history of drilling in this particular region a solution was purposed – application of Casing while Drilling technology. It is expected to help with all the expected difficulties, increase the efficiency of drilling and decrease the overall costs of the well and time required for its construction.
Translated title of the contributionAnwendung der Casing Drilling Technologie im Projekt N auf dem Nordseeschelf
Original languageEnglish
Awarding Institution
  • Montanuniversität
  • Sledkov, Vladimir Vladimirovich, Co-Supervisor (external), External person
  • Prohaska-Marchried, Michael, Co-Supervisor (internal)
  • Thonhauser, Gerhard, Supervisor (internal)
Award date22 Sept 2020
Publication statusPublished - 2020

Bibliographical note

embargoed until null


  • Drilling
  • Casing Drilling
  • Drilling with Casing
  • North Sea Shelf

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