Theoretically Indicated Methods of Wetting-Liquid Relative Permeability Measurement
- William H. Hartwig (The University of Texas, Austin)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- April 1953
- Document Type
- Journal Paper
- 15 - 16
- 1953. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 5.6 Formation Evaluation & Management
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- 155 since 2007
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A paper by Rose has called attention to some of the problems of wetting-liquid relative permeability measurement. The premises and conclusions set forth by Rose, namely the applicability of the Hassler scheme of measurement, will be accepted. In addition, it will be concluded that certain electrical analog circuits can be used as a pattern for consideration of possible hydraulic systems of measurements.
New Scheme of Measurement
The object of this note is to propose a new scheme of wetting liquid relative permeability measurement. It is significantly different from those heretofore described, nonetheless it is based on Hassler concepts. The scheme is illustrated in Fig. 1 in terms of the corresponding electric circuit analog. It may be designated descriptively as the "comparison" method of wetting-liquid relative permeability measurement.
The resistance of the core sample is assumed small compared to the barrier resistances. This condition, it will be recalled, is a limitation of the methods discussed by Hassler and Rose but becomes an advantage in the method here proposed.
A complete transient analysis of this network is not necessary if the above conditions are observed. The equation for the battery current, in terms of the Laplacian operator, is given to illustrate the assumptions to be made.
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