Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1977-03-03
1978-05-30
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
G01V 312, G01V 318
Patent
active
040925838
ABSTRACT:
The disclosure is directed to an apparatus and method for determining the water-filled porosity of formations surrounding a borehole. Means are provided for deriving a first quantity which is a measure of the travel time of microwave electromagnetic energy propagating over a predetermined distance in the formations, this first quantity being designated as t.sub.p1. Means are also provided for deriving a second quantity which is a measure of the attenuation of the microwave electromagnetic energy propagating over the predetermined distance in the formations, the second quantity being the attenuation constant, .alpha., in the preferred embodiment. Further means, responsive to the second quantity, are provided for generating a third quantity, designated t.sub.pwl, which is representative of the travel time of microwave electromagnetic energy propagating over the predetermined distance in water having a lossiness determined from the second quantity. Finally, means responsive to the first and third quantities are provided for generating a porosity-indicative quantity, designated .phi..sub.w, as a function of the first and third quantities. In the preferred embodiment of the invention, means are provided for deriving a fourth quantity, designated t.sub.pm, representative of the travel time of microwave electromagnetic energy propagating over the predetermined distance in the formation matrix. In this embodiment, the means for generating a porosity-indicative quantity is also responsive to the fourth quantity for generating the porosity-indicative quantity as a function of the first, third, and fourth quantities.
REFERENCES:
patent: 3849721 (1974-11-01), Calvert
patent: 3944910 (1976-03-01), Rau
Novack Martin M.
Schlumberger Technology Corporation
Strecker Gerard R.
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