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PETE 603 EXAM B November 5, 2007 (Closed book w/ 2 hand-written pages of notes in your handwriting - 50 minutes) 1. (20 points) Suppose we have a producing well in Odeh's gridblock (10,10,3). We know that the oil is initially undersaturated with the bubble point of 4014.7 psia and an initial reservoir pressure of 4800 psig. Calculate Jmodel, qo, qw, and qg if pwf = 2,000. (Assume pn+1 = 4014.7, kro = 0.8, krw = 0, krg = 0).
2. (20 points) Calculate total compressibility, ct, and its components (for each phase) using the following data plus Odeh's data. Assume injection with increasing pressures. (a) for gas not redissolving (Case 1) (b) for gas redissolving (Case 2) Data: p = 2515.0 psia, Sw = 0.12, Sg = 0.26
3. (20 points)
An oil well build-up test gives the following pressure behavior.
[Well test analysis gives the following: permeability = ∆t. ps (hrs) (psi) --------0.6 1500 1.0 1590 2.0 1682 5.0 1752 10.0 1784 20.0 1818 40.0 1848 60.0 1868 Other data: qo = 120 STB/D 17.0E-6 psi-1 Bo = 1.3 µo = 1....

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