Method and apparatus for logging earth boreholes using self-cont

Details Method and apparatus for logging earth boreholes using self-cont Method and apparatus for logging earth boreholes using self-cont

1976-08-02

1977-09-13

Myracle, Jerry W.

Measuring and testing

Borehole or drilling

Downhole test

E21B 4700

Patent

active

040474305

ABSTRACT:
A self-contained, battery powered well logging instrument is pumped down the interior of a drill pipe string having a catcher sub at its lower end. When the logging instrument latches into the catcher sub, the pumped fluid circulation is blocked, after which increased pump pressure switches a valve assembly to recreate circulation and energize the logging instrument to the standby position. An accelerometer in the logging instrument detects the upward movement of the instrument and switches the circuitry from standby to the record mode. The output from a clock controlled by the downhole accelerometer is recorded along with the logging information and is synchronized with pipe footage measurements and with a similar such accelerometer and clock at the earth's surface which are responsive to the movement of the pipe string at the earth's surface. The recorded logging samples are thus related to true depth by correlating with the data simultaneously recorded at the earth's surface. As an alternative embodiment, the logging instrument is attached to the drill pipe prior to running the pipe into the borehole. As an additional embodiment, a logging instrument is provided having a variable output accelerometer and associated circuitry which provides depth information independently of the equipment at the earth's surface.

REFERENCES:
patent: 3490149 (1970-01-01), Bowers
patent: 3545266 (1970-12-01), Wilson

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