ABSTRACT:

Recent technological advances are driving casing/liner drilling from a niche market into the mainstream drilling environment. Escalating deepwater costs and the need to further reduce onshore drilling expenses in low cost fields continue to push the technology forward. Improved connections and tubulars, as well as advances in rig technology and pipe handling have enabled operators to consider drilling with casing/liner as an option on many new wells. Contractors have utilized casing/liner drilling to effectively seal-off depleted pay zones or sloughing formations for years. However, the need to further extend open wellbores and drill beyond differential pressure zones is fast becoming a reality because of the increase in mature fields and the need to maximize production from existing assets. With a potential reduction in flat time and increased confidence in reaching section TD in a single run, casing while drilling has become a viable option.To better serve this expanding market, a service provider has introduced a new casing/liner drill bit solution. The system is engineered so operators can ream and drill casing/liner to bottom every time. The bit utilizes advanced 3D design methods and is manufactured from a specialized steel alloy. This unique material allows technicians to braze PDC cutters directly to the one-piece bit ensuring a robust cutting structure capable of efficiently drilling new formation as well as reaming existing hole. The system allows operators to run casing/liner to section TD and then drill out with no damage to the BHA. This non-retrievable casing/liner drilling system has been successfully applied in offshore and onshore environments worldwide. This paper will focus on several case studies and the lessons learned as well as opportunities to apply the technique and technology to other regions

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