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QUESTION 11 A production well is planned to drill in Perth Field. The reservoir engineering team suggested to use 6 5/8 inch production casing set at 15,000 ft. Estimate the number of casings needed to reach this depth safely and select the casing setting depth and size of each type of string using the pore and fracture pressure gradient and available casing sizes given in Figure below. Also, draw the wellbore diagram and recommend the mud program (mud schedule) to drill the well. Also, calculate the differential pressure (between pore pressure and fracture pressure) at the surface, and intermediate casing shoe. Conditions: 1. The minimum length of surface casing required to protect the freshwater aquifers is 3,000 ft. 2. Approximately 300 ft of conductor casing is generally required to prevent washout on the outside of the conductor. Equivalent pore and fracture pressure gradient, ppg Casing and liner size, in 5% 8 10 12 14 o Bit and hole size, in 4% 5% 6% 1000 - Pore Pressure 2000 Fracture Pressure Casing and liner size, in 6% 3000 7% 9% 4000 -Trip Margin 5000 -.- Kick Margin Bit and hole size, in 7% 8% 8% 9% 10% 1274 6000 7000 Casing size, in 8% 9% 9% 10% 13% 14 8000 Depth, ft 9000 Bit and hole size, in 10% 1244 14% 17 10000 11000 12000 Casing size, in 13% 112 11% 16 20 14 13000 14000 20 17% 26 Bit and hole size, in. 14% 15000 16000 24 30 20 16 Casing size, in 17000 QUESTION 11 A production well is planned to drill in Perth Field. The reservoir engineering team suggested to use 6 5/8 inch production casing set at 15,000 ft. Estimate the number of casings needed to reach this depth safely and select the casing setting depth and size of each type of string using the pore and fracture pressure gradient and available casing sizes given in Figure below. Also, draw the wellbore diagram and recommend the mud program (mud schedule) to drill the well. Also, calculate the differential pressure (between pore pressure and fracture pressure) at the surface, and intermediate casing shoe. Conditions: 1. The minimum length of surface casing required to protect the freshwater aquifers is 3,000 ft. 2. Approximately 300 ft of conductor casing is generally required to prevent washout on the outside of the conductor. Equivalent pore and fracture pressure gradient, ppg Casing and liner size, in 5% 8 10 12 14 o Bit and hole size, in 4% 5% 6% 1000 - Pore Pressure 2000 Fracture Pressure Casing and liner size, in 6% 3000 7% 9% 4000 -Trip Margin 5000 -.- Kick Margin Bit and hole size, in 7% 8% 8% 9% 10% 1274 6000 7000 Casing size, in 8% 9% 9% 10% 13% 14 8000 Depth, ft 9000 Bit and hole size, in 10% 1244 14% 17 10000 11000 12000 Casing size, in 13% 112 11% 16 20 14 13000 14000 20 17% 26 Bit and hole size, in. 14% 15000 16000 24 30 20 16 Casing size, in 17000