Operators in the oil and gas industry are constantly seeking the cost-effective methods of drilling and producing oil and gas to optimize the production and to maximize the profits. Conventional drilling methods have been plagued with huge operational and financial challenges, such as purchasing cost, inspecting, handling, transporting, and especially tripping in-and-out of the drill string whenever the BHA needs a replacement or when total depth is reached. That not only contributes to non-productive time, but also leads to well control difficulties including wellbore instability and lost circulation. Casing drilling has been under development for over a decade and has only been executed successfully as an advanced technology in recent years. Casing drilling simultaneously encompasses the drilling, casing and cementing operation during drilling. This paper presents a review of current techniques used in casing drilling technique and identifies the advantages and limitations and proffers solutions to casing drilling. Effort has been made to identify the advantage, limitation and practicability of retrievable liner drilling.
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