Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Patent
1979-05-24
1981-11-10
Strecker, Gerard R.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
With radiant energy or nonconductive-type transmitter
G01V 330
Patent
active
043000983
ABSTRACT:
The disclosure is directed to a technique used for determining the mudcake-corrected water-filled porosity of formations surrounding a borehole, and which can also be used for determining the thickness of the mudcake formed on the borehole. Microwave electromagnetic energy is transmitted into the formations. Near and far receiving antennas are employed for receiving microwave electromagnetic energy from the formations. Means responsive to the outputs of the receiving antennas are provided for obtaining a travel-time-dependent differential measurement. Further means, responsive to the output of one of the antennas, are provided for obtaining a travel-time-dependent direct measurement. Finally, means are provided for determining the mudcake-corrected water-filled porosity of the formations from the differential and direct measurements. The mudcake thickness may also be determined from the differential and direct measurements. In the preferred embodiment of the invention, the means for obtaining the travel-time-dependent differential measurement is operative to measure the phase difference between the electromagnetic energy received at the near and far receivers, and the means for obtaining the travel-time-dependent direct measurement is operative to measure the phase difference between a reference derived from the transmitted electromagnetic energy and the electromagnetic energy received at the far receiver.
REFERENCES:
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patent: 3690164 (1972-09-01), Gabillard et al.
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patent: 4185238 (1980-01-01), Huchital et al.
Gianzero Stanley
Huchital Gerald S.
Garrana Henry
Novack Martin
Schlumberger Technology Corporation
Strecker Gerard R.
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