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Q1 Propose the most practical and economical casing type to be used for the completion an exploration well in offshore Sabah, Malaysia. The exploration well was drilled with mud weight of 12.5 ppg, for formation pore pressure of 6500 psi and well total depth of 10,000 ft. (Note: clear explanations should be provided for all steps and calculations involved in arriving at final decision). The hole section is to be completed with L-80 grade 9%* casing based on the following API design factors: Tension, NT = 1.8 Burst, Ni = 1.1 Collapse, NC = 1.125