Measuring and testing – Borehole or drilling – Downhole test
Patent
1983-04-27
1985-04-23
Myracle, Jerry W.
Measuring and testing
Borehole or drilling
Downhole test
E21B 4700
Patent
active
045121869
ABSTRACT:
Method and apparatus for logging a well during drilling operations to record drilling fluid gas and rate of penetration as a function of depth. The system comprises elements for producing a succession of depth signals in response to applied inputs and applying the depth signals to a variable output scaler. The scaler is comprised of a set of retriggerable monostable units, each having different time constants. The scaler output is employed to actuate the index drive of a recorder to provide a desired logging scale. The scaler output is also employed to reset a bank of digital counters which are pulsed by clock signals from a time base generator. The values in the digital counters are applied to a digital-to-analogue converter. The output from the digital-to-analogue converter is recorded as a function of the depth index along with the gas signal. Latch elements are interposed between the digital counters and the converter. The latch elements may be switched between a latching state so that the rate of penetration signal is recorded in a point-to-point format or in a non-latching state so that the rate of penetration signal is recorded in a bar pattern format.
REFERENCES:
patent: 3504370 (1970-03-01), Rebilly
patent: 3777560 (1973-12-01), Guignard
patent: 3982432 (1976-09-01), Hammond
Uren, L. C. Petroleum Production Engineering 3rd Ed. 1946, McGraw-Hill Book Co., Inc., pp. 650-663.
Location Sample Service, Inc.
Myracle Jerry W.
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