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PET 441

Natural Gas Reservoir Engineering

Homework No. 1

Assigned: Mon, Aug 27, 2012 Due: Wed, Sept 5, 2012

Ramagost and Farshad (1981) provided the following information for an offshore Louisiana

gas reservoir.pi = 11,444 psia

cf = 19.5 x 10-6

psia-1

Swi = 0.22

cw = 3.2 x10-6

psia-1

Estimate the original gas-in-place

a. assuming a normally pressured gas reservoirb. assuming a geopressured reservoir and known cfc. assuming a geopressured reservoir with an unknown, but constant cf.

Provide all work in an organized and logical format. Include analysis and discussion of yourresults.

submit to:engler@nmt.edu

p,psia z Gp,Bcf p/z

11444 1.496 0 765010674 1.438 9.92 7423

10131 1.397 28.62 7252

9253 1.330 53.60 6957

8574 1.280 77.67 6698

7906 1.230 101.42 6428

7380 1.192 120.36 6191

6847 1.154 145.01 5933

6388 1.122 160.63 5693

5827 1.084 182.34 5375

5409 1.054 197.73 5132

5000 1.033 215.66 4840

4500 1.005 235.74 44784170 0.988 245.90 4221

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