Effect of Pressure Reduction upon Core Saturation
- H.G. Botset (Gulf Research and Development Co.) | M. Muskat (Gulf Research and Development Co.)
- Document ID
- Society of Petroleum Engineers
- Transactions of the AIME
- Publication Date
- December 1939
- Document Type
- Journal Paper
- 172 - 183
- 1939. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 5.2.1 Phase Behavior and PVT Measurements, 4.2.3 Materials and Corrosion, 4.6 Natural Gas, 5.1 Reservoir Characterisation, 2.4.3 Sand/Solids Control, 1.6.9 Coring, Fishing, 1.6 Drilling Operations
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Any information that will increase the accuracy of our knowledge of theconditions prevailing in petroleum reservoirs should be of direct value in thedetermination of the proper operating technique as well as in the estimation ofreserves and of ultimate production. The obvious method of obtaining thisinformation is by studying a sample of the reservoir rock and its contents. Inany such study, the problem of primary importance and maximum difficulty isthat of getting the core to the surface in such a manner that its originalfluid content is undisturbed, which has so far proved to be an impossible task.Though it might be rash to say this will never be done, it is certainly safe toassume that a method for the recovery of a core at the surface in itsundisturbed original state may not be developed in the immediate future, andcertainly will not be forthcoming without a great deal of costlyexperimentation.
Therefore any information that may be obtained that will help to correlate thestate of a core (its fluid saturation) at the surface with its condition at thetime it was drilled should be of value to the petroleum industry. Theexperiments described in this paper were undertaken with the purpose ofdetermining, if possible, any relationship that might exist between thesaturation of a core at the surface and its original fluid content. Noconsideration has been given to the question of contamination by penetration ofdrilling water, since this problem has been extensively studied by otherinvestigators. Furthermore, it was regarded as outside the scope of theseexperiments, which were concerned only with the effect of pressure reductionupon the liquid content of cores.
In an experimental study of this sort involving a large number of variables,accurate control of all factors is very important. The essential and obviousprocedure is to vary systematically one factor or condition while keeping allthe others constant, which necessarily involves a rather protracted andsometimes tedious experimental program.
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