A Magnetic Susceptibility Method for the Determination of Liquid Saturation in Porous Materials
- J.W. Whalen (Magnolia Field Research Laboratories)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- September 1954
- Document Type
- Journal Paper
- 111 - 116
- 1954. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 2.4.3 Sand/Solids Control, 5.2 Reservoir Fluid Dynamics, 4.3.4 Scale, 5.6.5 Tracers, 4.2.3 Materials and Corrosion, 4.1.2 Separation and Treating, 5.3.2 Multiphase Flow, 1.6.9 Coring, Fishing, 4.1.5 Processing Equipment
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The design, operation and evaluation of an instrumental method for the determination of fluid saturation in porous materials during multiphase flow studies is described. The presence of a magnetic tracer comprising approximately 20 per cent by weight of the aqueous phase is necessary in the utilization of this method.
The results of two-phase relative permeability studies on two samples of porous media are presented. The realizable accuracy of the magnetic susceptibility apparatus in fluid saturation determination is estimated to be 2 saturation per cent. The response characteristics of the instrument, together with its simplicity of operation and maintenance are sufficient to recommend its use in routine laboratory studies.
The problem of fluid saturation determination in laboratory multiphase flow studies characterizing oil recovery processes is one which has been given exhaustive study. Briefly the requirements which are considered essential for a method serving this purpose are: (1) that the measurement be made external to the porous rock sample under study with no interruption of the fluid flow pattern, (2) the saturation indication must be independent of fluid distribution in the volume scanned by the measuring device, (3) the sensing element should have a small field of definition enabling several independent measurements to be made along the length of a core sample, and (4) the properties of the fluid phases should not be too greatly influenced by required tracer substances.
Several methods of saturation determination have found acceptance as meeting most of the above requirements. These include resistivity, X-Ray absorption, radiotracers, and neutron diffraction. The merits of these techniques have been discussed elsewhere in detail and will not be considered here. It may, however, be pointed out that the elaborate instrumentation required by the methods mentioned above, with the exception of the resistivity method (which is undesirable from other standpoints) encourages the development of methods of saturation determination which, while meeting the requirements listed, are simple to operate and maintain.
It is the purpose of this paper to describe the instrumentation and evaluation of a technique for the determination of fluid saturation which combines relative simplicity with an accuracy and applicability comparable with methods now in practice.
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