Radiant energy – Geological testing or irradiation
Patent
1991-03-19
1992-09-08
Howell, Janice A.
Radiant energy
Geological testing or irradiation
250256, G01N 2135
Patent
active
051460866
ABSTRACT:
A method and apparatus is described for determining petrophysical properties of porous media by the use of light transmission through the media. Specifically, by using a highly collimated light source, preferably a laser, the permeability, grain size, wettability, porosity and clay swelling behavior of a sample can be determined on the scale of millimeters. A calibration curve or function is first established to correlate light transmission through a slab of sandstone on the order of 5 to 10 mm under known conditions. This curved is then used to determine unknown conditions by measuring light transmission and comparing the values to those on the curve. Other applications for the phenomenon of light transmission through porous media are disclosed whereby conditions in a flowing stream of liquid can be monitored by use of light transmission. Specifically, changes in the refractive index and immiscible contamination can be detected. Finally, the phenomenon described can be used to model subterranean hydrocarbon bearing reservoirs, particularly fluid flow at different points in the reservoir, using light rather than hydraulic flows to simulate fluid flow patterns.
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De Bibhas R.
Nelson Michael A.
Pande Kiran K.
Chevron Research and Technology Company
Hanig Richard
Howell Janice A.
Keeling Edward J.
Power David J.
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