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The AAPG/Datapages Combined Publications Database
AAPG Special Volumes
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The fundamental law which governs the flow of slightly compressible fluids in permeable formations has been used to compute three unit functions useful in well or reservoir analysis. These unit functions give quantitative information on (1) the change of pressure in the well or formation as a result of unit rate of injection during a period of time, (2) the amount of fluid which can be disposed of per unit pressure increase in a given time, and (3) the effect of an enlarged borehole on the injection pressure. Numerical data on the first two functions have been published previously (van Everdingen and Hurst, 1949). The data for the function giving the effect of an enlarged borehole are presented for the first time.
Accurate prediction of pressures and pressure changes is now possible provided sufficient information is available on the physical characteristics of the formation, the formation fluids, and the injected fluids. The numerical values of these characteristics can vary considerably. To simplify computations, conversion factors are used so that the solutions given here can be used to solve most of the problems irrespective of the numerical values of the characteristics encountered.
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