1. A 50-ft thick, 30-md permeability sandstone pay zone at a depth of 10000 ft is to be acidized with an acid solution having a specific gravity of 1.07 and a viscosity of 2 cp down a 2-in.-ID coiled tubing. The formation fracture gradient is 0.8 psi/ft. The wellbore radius is 0.328 ft. Assuming a reservoir pressure of 5,000 psia, drainage area radius of 1,500 ft and skin factor of 9, calculate

(a) the maximum acid inject rate using safety margin 100 psi.

(b) the maximum expected surface injection pressure at the maximum injection rate.

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