الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
This thesis Introduces and defines the casing while drilling technology and its requirements and applications, performs a comparison between loads and stresses in conventional drill string and drill casing string, and performs cost analysis between conventional drilling and casing drilling technique in West of Nile field (WON) operated by Qarun Petroleum Company (QPC). The implementation of casing while drilling technique mitigates wellbore instability, optimizes drilling hydraulics, achieves 110178 USD direct cost savings and indirect cost savings by putting well into production 4.5 days earlier than conventional drilling.