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Unformatted text preview: Production Engineering PGE 362 Homework 9 This is due in lecture time on Nov. 9, 2007. (10 points possible) Please design a matrix acid job for the following conditions. A mud invaded high quartz content (more than 80% quartz) sandstone. The actual radius of damage is unknown, but a minimum estimate can be made from Darcy’s Law if we consider the radius from the well that requires 30% of the total pressure drop. Reservoir and Well Conditions: Datum = 8000' Thickness (h) = 50' Drainage Area = 40 acres Well Bore Diameter = 4" Drainage Boundary Pressure = 2640 psi Bottom hole flowing pressure = 2000 psi Oil Gravity = 35 degrees API Gas Specific Gravity = 0.7 Bottom Hole Temperature = 150 degrees F 1.26 bbl/STB 0.87 cp o o B μ = = 20 md =0.25 s = +2.0 Fracture Gradient = 0.8 psi/ft Tubing ID = 2" with the end on a packer at 7800 o k φ = ' Casing ID = 4" Perforations: 7975 - 8025' Total Number of Perforations = 200 Acid Specific Gravity = 1.05 It is desirable to use ball sealers to divert acid into each perforation. The It is desirable to use ball sealers to divert acid into each perforation....
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- Spring '08