Electrical Coring; a Method of Determining Bottom-hole Data by Electrical Measurements
- C. Schlumberger (Schlumberger Electrical Prospecting Methods) | M. Schlumberger (Schlumberger Electrical Prospecting Methods) | E.G. Leonardon (Schlumberger Electrical Prospecting Methods)
- Document ID
- Society of Petroleum Engineers
- Transactions of the AIME
- Publication Date
- December 1934
- Document Type
- Journal Paper
- 237 - 272
- 1934. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 4.1.2 Separation and Treating, 1.6 Drilling Operations, 5.1.2 Faults and Fracture Characterisation, 5.8.5 Oil Sand, Oil Shale, Bitumen, 4.3.4 Scale, 4.6 Natural Gas, 1.12.6 Drilling Data Management and Standards, 4.1.5 Processing Equipment, 3 Production and Well Operations, 4.5 Offshore Facilities and Subsea Systems, 2.4.3 Sand/Solids Control
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Since the beginning of the year 1928 the senior authors and their associates have applied a series of procedures which makes possible the detailed study in situ of the formations traversed by a drill hole before the casing has been landed. They have given the name "electrical coring" to the ensemble of these processes, which now replace in a large measure the mechanical coring performed by the drillers, and permit the gathering of bottom-hole data hitherto unobtainable.
Three years have elapsed since the technique and interpretation of these measurements emerged from the experimental stage and entered the field of industrial application on a large scale. The total length of drill holes so far surveyed by the authors and their associates, all over the world, amounts to several millions of feet. Practical and strongly built equipment has been evolved, which permits the examination in a short time of an open hole several thousand feet long.
No comprehensive paper has yet been published discussing the essential principles of the processes applied and bringing into evidence their economic interest. This is the object of the present paper.' Numerous examples of field work performed under varied geological conditions are given, constituting a concrete illustration of the services rendered by the new methods.
The study in situ of the formations penetrated by a drill hole is based on the measurement of a given physical factor or parameter associated with these formations. Generally the measurements are made systematically along the whole length of the open hole. The physical factors or parameters which are now utilized by us to this end are: (1) the resistivities of the rocks; (2) their porosity; (3) their electrical anisotropy; (4) their temperature; (5) the resistivity of the muds.
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