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SOME BASIC CONCEPTS IN RESERVOIR ENGINEERING 41
gas, being more mobile, will travel with a much greater velocity than the oil. This leads
to a certain degree of chaos in the reservoir and greatly complicates the description of
fluid flow.
From this point of view, it is preferable to produce the reservoir close to (or above)
bubble point pressure, which greatly simplifies the mathematical description. Not only
that, but as will be shown in Chapter 3, operating in such a manner enhances the oil
recovery. The manner in which the reservoir pressure can be maintained at or above
bubble point is conventionally by water injection, a detailed description of which is
presented in Chapter 10.
REFERENCES
1) Lynch, E.J.,1964. Formation Evaluation. Harper and Row, New York.
2) Bradley, J.S., 1975. Abnormal Formation Pressure. The American Ass. of Pet.
Geologists Bulletin, Vol. 59, No. 6, June: 957−973.
3) Chapman, R.E., 1973. Petroleum Geology, a Concise Study. Elsevier Scientific
Publishing Co., Amsterdam: 67−76.
4) Earlougher, R.C., Jr., 1977. Advances in Well Test Analysis. SPE Monograph:
Chapter 8.
5) Lebourg, M., Field, R.Q. and Doh, C.A., 1957. A Method of Formation Testing on
Logging Cable. Trans. AIME, 210: 260−267.
6) Schultz, A.L., Bell, W.T. and Urbanosky, H.J., 1974. Advancements in
Uncased−Hole Wireline−Formation−Tester Techniques. SPE paper 5053,
prepared for the Annual Fall Meeting of the SPE of AIME; Houston, Texas.
October.
7) Craft, B.C. and Hawkins, M.F., Jr., 1959. Applied Petroleum Reservoir
Engineering. Prentice−Hall, Inc. New Jersey.
8) Amyx, J.W., Bass, D.M. and Whiting, R. L., 1960. Petroleum Reservoir
Engineering − Physical Properties. McGraw-Hill.
9) Walstrom, J.E., Mueller, T.D. and McFarlane, R.C., 1967. Evaluating Uncertainty
in Engineering Calculations. J.Pet. Tech., July: 1595−1603.
10) Northern, I.G., 1967. Risk Probability and Decision-Making in Oil and Gas
Development Operations. Paper presented at Petroleum Soc. of CIM. Technical
Meeting, Banff, Canada. May.
11) Standing, M.B. and Katz, D.L., 1942. Density of Natural Gases. Trans. AIME,
146: 140−149.
12) Gas Processors Suppliers Association, 1972 (Revised 1974). Engineering Data
Book. GPSA, Tulsa: 16−2.
