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American Films and Average Reservoir Pressure

By Azrinkun12 Apr 15, 2013 431 Words
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UNIVERSITI TEKNOLOGI MARA CGE654 TUTORIAL 1 Productivity Index, Inflow Performance Relationship and Decline Curves Question 1: The productivity index for a well in an undersaturated reservoir is 2.6 bbl/d/psi. Calculate the drawdown required for a production rate of 800 bbl/d of oil with an average reservoir pressure of 2500psi. Question 2: A reservoir has been producing under stabilized flow condition at 1200 bbl/d with a flowing bottomhole pressure of 1800psi. The average reservoir pressure is 3000psi. Calculate the productivity index. Assume the wells being produced above the bubble point pressure. Question 3: With a given PI = 4.61 bbl/day/psi and ̅ a) What is Pwf when qo is zero? b) What is q(max)? c) What is q when Pwf = 2500psi? d) What is Pwf when the well is flowing at 4000 bbl/day? Question 4: A well flow at 2000 stb/d with a flowing bottom hole pressure of 2500 psia. Static average reservoir pressure is 3000 psia. Calculate q(max) by assuming the well being produced at bubble point pressure. Question 5: A reservoir and well have the following data. Average reservoir pressure 2400 psi Oil flow rate 100 bbl/d Flowing bottom hole pressure 1800 psi Bubble point pressure 2600 psi Determine; a) The maximum flow rate b) The flowrate for a flowing bottomhole pressure of 800psi using Vogel’s inflow relationship. c) Plot the inflow performance relationship.

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Student ID : Question 6: A reservoir is producing under stable conditions with the following data: Average reservoir pressure 1600 psi Flowing bottom hole pressure 1000 psi Bubble point pressure 1600 psi Stabilised flow rate 150 bbl/d a) Calculate the maximum oil production rate. b) Plot the inflow performance relationship. Question 7: An oil reservoir is producing at a reservoir pressure below the bubble point pressure. Given the following data, calculate; a) The maximum oil production. b) The production rate for a flowing bottomhole pressure of 950psi. Average reservoir pressure 1900 psi Flowing bottom hole pressure 1350 psi Flow rate 210 bbl/d Question 8: A well produces 70 stb/d at a flowing bottom hole pressure of 1147 psia. Average reservoir pressure is 1200 psia, which is also bubble point pressure. a) By using straight-line PI and Vogels correlation: i. Calculate maximum possible rate when Pwf is zero. ii. If Pwf could be reduced to 550 psia (e.g.by pumping) what rate would be achieved? b) Prepare IPR curves using Vogel and straight-line PI methods. c) By using Fetkovich methods, prepare IPR curve for ̅ .

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