Abstract Electrical signals from a well logging instrument are coupled to the earth''s surface where circuitry is provided for a series of common depth point correlations. In one embodiment, the digitized signals drive an eight-bit counter which is gated through eight respective buffer circuits to eight serial shift registers. The signals in the eight-bit counter section are clocked out to the buffer section once each second regardless of movement of the well logging instrument in the borehole. The signals are shifted from the shift register at the rate of four bits per foot of well logged into a digital-to-analog converter. The amount of delay within the circuit is a function of the number of bits in the shift register divided by the number of depth pulses per foot of well logged. In an alternative embodiment, the analog signal to be delayed is converted to a parallel ten-bit digital signal which is then converted to a series signal which is coupled into a serial shift register. The conversion process is a function of depth pulses relating to the number of feet logged in the well. The output of the serial shift register is connected to a seriesto-parallel register which is coupled into a digital-to-analog converter. In still another embodiment, the serial shift register is used with means for selecting the length of the register to vary the amount of delay. In yet another embodiment, a plurality of signal channels is coupled through a multiplexer and an analog-to-digital converter to the shift register. As with the other embodiments, a depth pulse generator clocks the pulses through the system and a demultiplexer provides a plurality of analog channels at the output of the system.
Inventors
👤 G Adamson
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-22 20:07
CPC Classifications
G; G01; G01V; G01V11/00; G01V11/002
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
194 words
A system for providing common depth point correlation between two points of interest on a well logging instrument wherein said two points are separated by a given distance along the length of said instrument, comprising: means for generating an analog signal functionally related to a characteristic of the earth formations at the same depth in an earth borehole as one of said two points on said instrument; means for converting said analog signal to digital signals having a parallel format; a parallel to series register adapted to convert said digital signals in parallel format into digital signals in series format; a serial shift register adapted to receive said digital signals in series format; means for generating electrical depth pulses indicative of the movement of said well logging instrument through the earth borehole; means responsive to said depth pulses for removing said digital signals from said shift register in a series format; a series to parallel register adapted to convert said digital signals in series format into digital signals in parallel format; and means for converting the digital signals in parallel format at the output of said series to parallel register into an analog signal.
Claim 2
Independent Claim
194 words
A system for providing common depth point correlation between two points of interest on a well logging instrument wherein said two points are separated by a given distance along the length of said instrument, comprising: means for generating an analog signal functionally related to a characteristic of the earth formations at the same depth in an earth borehole as one of said two points on said instrument; means for converting said analog signal to digital signals having a parallel format; a parallel to series register adapted to convert said digital signals in parallel format into digital signals in series format; a serial shift register adapted to receive said digital signals in series format; means for generating electrical depth pulses indicative of the movement of said well logging instrument through the earth borehole; means responsive to said depth pulses for removing said digital signals from said shift register in a series format; a series to parallel register adapted to convert said digital signals in series format into digital signals in parallel format; and means for converting the digital signals in parallel format at the output of said series to parallel register into an analog signal.
Claim 3
Independent Claim
180 words
A system for providing common depth point correlation among electrical signals originating from a plurality of locations spaced along the length of a well logging instrument, comprising: means for generating a first analog signal functionally related to a characteristic of the earth formations at the same depth in an earth borehole as that of one of said plurality of locations; means for generating a second analog signal functionally related to a characteristic of the earth formations at the same depth in an earth borehole as that of a second of said plUrality of locations; a multiplexer adapted to receive and multiplex said analog signals; means for converting said multiplexed analog signals to digital signals having a serial format; a serial shift register adapted to receive said digital signals; means for generating electrical depth pulses indicative of the movement of said well logging instrument through the earth borehole; means responsive to said depth pulses for removing said digital signals from said shift register; means for converting said digital signals to analog signals; and a demultiplexer adapted to demultiplex said analog signals.
Claim 4
Independent Claim
180 words
A system for providing common depth point correlation among electrical signals originating from a plurality of locations spaced along the length of a well logging instrument, comprising: means for generating a first analog signal functionally related to a characteristic of the earth formations at the same depth in an earth borehole as that of one of said plurality of locations; means for generating a second analog signal functionally related to a characteristic of the earth formations at the same depth in an earth borehole as that of a second of said plUrality of locations; a multiplexer adapted to receive and multiplex said analog signals; means for converting said multiplexed analog signals to digital signals having a serial format; a serial shift register adapted to receive said digital signals; means for generating electrical depth pulses indicative of the movement of said well logging instrument through the earth borehole; means responsive to said depth pulses for removing said digital signals from said shift register; means for converting said digital signals to analog signals; and a demultiplexer adapted to demultiplex said analog signals.