Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1990-04-12
1991-06-11
Hannaher, Constantine
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
250265, 2503851, 250389, 250394, G01V 504
Patent
active
050234501
ABSTRACT:
This disclosure is directed to a detector system for use in measuring while drilling (MWD) equipment. It comprises preferably duplicate chambers positioned to one another and mounted in a MWD system where they are subject to the same shock and vibration. The shock and vibration impinge on the two chambers, and cause two output signals to be formed. The two output signals are applied to a differential amplifier so that the microphonic portion of the signal is cancelled. This then leads to a differential output signal which carries in it the signals representing nuclear events detected by the similar or duplicate detector means. Alternately, a single chamber can be used if it is provided with two anode wires and they are connected to the differential amplifier for signal cancellation.
REFERENCES:
patent: 3013156 (1961-12-01), Hearn
Beard William J.
Halliburton Logging Services Inc.
Hannaher Constantine
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