KEY Homework _2

# KEY Homework _2 - PGE 331 KEY Homework 2 Use the data in...

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PGE 331 KEY Homework 2 Use the data in HW2Dat.xls for this problem. 1. Black Oil Calculations. (10 points) a. Show that the two-phase oil formation volume factor for a black oil is given by N V B T to = 1 V T = total volume of hydrocarbon phases, N = surface volumes (STB) fg fo T V V V + = 2 V fo = total volume of free-oil phase (STB) V fg = total volume of the free-gas phase (scf) V fo = N fo B o 3 V fg = G fg B g 4 N fo = surface volume of oil in the free-oil phase (STB) G fg = surface volume of gas in the free-oil phase (scf) N fo + N fg = N 5 G fo + G fg = G 6 N fg = surface volume of oil in the free-gas phase (STB) G fo = surface volume of gas in the free-oil phase (scf) N fg = G fg R v 7 G fo = N fo R s 8 substituting 7 into 5 N fo = N – G fg R v 9 substituting 9 into 8 NR s – G fg R v R s + G fg = G 10 Solving for G fg

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s v s fg R R NR G G = 1 1 1 substituting 11 into 9 s v v fo R R GR N N = 1 1 2 substituting 12 into 3 s v s si g v si o to R R R R B R R B B + = 1 ) ( ) 1 ( For Black oil Rv approaches zero and then we have: B to = B o + B g R si R s ( ) The sheet labeled Prob1 contains the PVT data for a constant composition expansion (CCE) of a black oil. The CCE is done at 154 o F and the specific gravity of the gas evolved from solution is 0.8. b. Estimate the bubble point pressure and the undersaturated oil compressibility from this data.
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## This note was uploaded on 04/08/2008 for the course PGE 331 taught by Professor Lake during the Fall '07 term at University of Texas.

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KEY Homework _2 - PGE 331 KEY Homework 2 Use the data in...

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