Apparatus and method for determining the position of a tool in a

Details Apparatus and method for determining the position of a tool in a Apparatus and method for determining the position of a tool in a

1986-12-31

1989-01-10

Smith, Jerry

Boots, shoes, and leggings

73151, 33304, G01V 318, E21B 4700

Patent

active

047978228

ABSTRACT:
A system and method for precisely and continuously estimating the path length between the entrance of a borehole and a probe (10) which is supported by an elastic cable (14) and carries a gyrocluster (42) and accelerometer cluster (40). The precise estimate of borehole path length is used to aid the inertial navigation performed within the survey system and is selectively determined by integration of either the rate at which the probe (10) moves along the borehole or a compensated cable feed rate that is based on the rate at which the cable (14) passes into or out of the borehole with correction being made for changes in temperature and gravity induced cable stretch. Selection of the rate to be integrated at any given time being determined by whether the rate at which probe (10) moves along the borehole exceeds the compensated cable feed rate by a predetermined amount.

REFERENCES:
patent: 4362054 (1982-12-01), Ringot
patent: 4542647 (1985-09-01), Molnar
patent: 4545242 (1985-10-01), Chan
patent: 4662209 (1987-05-01), Brown

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