Data for Questions 1 and 2 A reservoir has a drainage radius of 1500 ft, thickness...

 

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Data for Questions 1 and 2 A reservoir has a drainage radius of 1500 ft, thickness of 100 ft, horizontal permeability of 20 md and a vertical permeability of 2 md. The oil viscosity is 2.5 cp and the oil formation volume factor is 1.1 rbbls/stb. The bubble point pressure is 2500 psi. 1. (30 points) A well of 0.328-ft radius is drilled in the reservoir with a constant pressure of 4000 psi kept at the drainage boundary. If a 1000 psi drawdown is applied, what is the oil flow rate for an open hole completion in an undamaged formation? 2. (70 points) If the formation damage changed the permeability to 20% of the original in a range of 1.5 ft into the formation from the wellbore, and the well is completed in a 40 ft section from the top of the formation with 6-in long perforations resulting in a perforation skin of 1.5, wellbore radius is still 0.328 ft. a. What is the total skin factor? b. What is the productivity ratio of the undamaged to the damaged well? c. If acidizing completely removed the damage completely, what is the production rate for the completed well for the same drawdown as Problem 1? Data for Questions 1 and 2 A reservoir has a drainage radius of 1500 ft, thickness of 100 ft, horizontal permeability of 20 md and a vertical permeability of 2 md. The oil viscosity is 2.5 cp and the oil formation volume factor is 1.1 rbbls/stb. The bubble point pressure is 2500 psi. 1. (30 points) A well of 0.328-ft radius is drilled in the reservoir with a constant pressure of 4000 psi kept at the drainage boundary. If a 1000 psi drawdown is applied, what is the oil flow rate for an open hole completion in an undamaged formation? 2. (70 points) If the formation damage changed the permeability to 20% of the original in a range of 1.5 ft into the formation from the wellbore, and the well is completed in a 40 ft section from the top of the formation with 6-in long perforations resulting in a perforation skin of 1.5, wellbore radius is still 0.328 ft. a. What is the total skin factor? b. What is the productivity ratio of the undamaged to the damaged well? c. If acidizing completely removed the damage completely, what is the production rate for the completed well for the same drawdown as Problem 1?

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Regarding issue 1 supplied data The drainage radius of the reservoir is 1500 ft 1500 r d Thickness of reservoir C 100 h 100 ft The horizontal permeabi... View the full answer