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Unformatted text preview: PGE 421K, Spring 2010 HOMEWORK 7 Solutions 1) Wells in a certain gas reservoir have productivity index PI in the range 410-4 to 610-4 MSCFD/psi 2 . The initial reservoir pressure was 866 psia. Based on cumulative production you estimate the average reservoir pressure is now 635 psia. When you started up the field, you set the wellhead pressure so that the flowing bottomhole pressure P bh was 435 psia. The wellhead pressure has not changed appreciably since startup, so you are assuming that P bh has not changed either. The wells produce 8 to 10 bbl water per MMSCF of gas. a. What was the range of gas production rates after the field started up? gG = g g Solve for : = gGg g For gG = 0.0004 and 0.0006 , g = 866 , g = 435 : = 4 10 866 435 = 224 = 6 10 866 435 = 336 b. What range of gas production rates should you be getting today, based on your assumption about P bh ? For gG = 0.0004 and 0.0006 , g = 635 , g = 435 : = 4 10 635 435 = 86 = 6 10 635 435 = 128 c. If water has accumulated to a height of 50 ft above the perforations in each...
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- Spring '11