Downhole penetrometer

Details Downhole penetrometer Downhole penetrometer

1991-12-04

1992-11-24

Williams, Hezron E.

Measuring and testing

Borehole or drilling

Downhole test

73784, E21B 4900

Patent

active

051652749

ABSTRACT:
A downhole penetrometer comprising a body which can be lowered into a borehole and including a tooth and an associated actuator for moving the tooth radially outwardly from the body so as to penetrate the wall of the borehole, a sensing arrangement being provided for determining the force applied to the tooth and the extent of penetration of the tooth into the borehole wall. A motor and pump arrangement is included to power the actuator, power typically being provided by a wireline which can also be used to communicate readings to the surface. A pair of inflatable packer modules are situated above and below the tooth to isolate an interval of the borehole in which a measurement is being made.

REFERENCES:
patent: 2927459 (1960-03-01), Farrington
patent: 3872717 (1975-03-01), Fox
patent: 3934468 (1976-01-01), Brieger
patent: 4149409 (1979-04-01), Serata
patent: 4461171 (1984-07-01), de la Cruz
patent: 4806153 (1989-02-01), Sakai et al.
patent: 4843878 (1989-07-01), Purfurst et al.
patent: 4860581 (1989-08-01), Zimmerman et al.
patent: 4936139 (1990-06-01), Zimmerman et al.
patent: 5042595 (1991-08-01), Ladanyi
Proc. of 8th Drilling and Blasting Symp., University of Minnesota, 1958, 1A-22A, and Trans. A.I.M.E., 232 pp. II-327 II-332.
"Poro-elastic Response of a Borehole in a Non-hydrostatic Stress Field", Int. J. Rock Mechanics, vol 25, 3, 1988.

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