QUESTION 2 (20 Marks) CLO CLOI Marks (a) b) 8 12 (a) Bunga Raya Oil Company wishes to drill and complete a Bunga Raya A-2 well as a single oil producer. Its production hole's target depth is 9,500 ft and the engineer-in-charge decided to use sufficient 13%-inch surface casing string so that an intermediate string is not required. If the maximum anticipated mid weight at 9,500 ft is 11.5 ppg. please determine the exact surface casing setting depth using EMW method (Note: You may use a graphical method by plotting EMW and fracture gradients vs. depth in the same graph to obtain the exact surface casing setting depth and its fracture gradient, please use a proper graph paper and all values of interval of the x- and y-axis must be clearly shown. Failure to comply any of the two instructions will result in zero mark for your plot)). (8 Marks) (b) Design the 13%-inch surface casing string for Bunga Raya A-2 single oil producer by taking into consideration burst and tension loads. Other forces such as collapse load, bending, etc. can be neglected. The casing string should consist of one section only. Other given data are as follow (Note: Please use graph papers and all values of interval of the x- and y-axis must be clearly shown. Failure to comply any of the two instructions will result in zero mark for your plot): Hole size = 174-inch Formation gas gradient = 0.46 psi/ft. Gas (kick) gradient = 0.12 psi/ft. Safety factor for burst = 1.0 Safety factor for tension = 1.7 Mud weight to drill surface hole = 10 ppg Safety factor for injection pressure = 1.0 (12 Marks)