Surveying of a borehole for position determination

Details Surveying of a borehole for position determination Surveying of a borehole for position determination

1983-09-08

1985-04-02

Birmiel, Howard A.

Measuring and testing

Borehole or drilling

Downhole test

33304, 364422, E21B 47022

Patent

active

045079587

ABSTRACT:
A borehole is surveyed by positioning at the mouth of the borehole a survey instrument having a casing and a three-axis rate gyroscope unit mounted within the casing, and sensing at least two components of gravity in at least two mutually transverse directions with respect to the survey instrument by means of a gravity sensor unit. The survey instrument is then moved along the borehole with the start and finish of the run being at the mouth of the borehole or at some known reference along the path of the borehole. During the run the rates of rotation about three non-coplanar axes are sensed at a series of locations along the length of the borehole by means of the rate gyroscope unit. The position of the borehole at each measuring location is then calculated by determining the initial set of direction cosines from the sensed gravity components and an assumed initial value of the azimuth angle and incrementing these values using the rates of rotation sensed by the rate gyroscope unit to obtain the sets of direction cosines at subsequent measuring locations.

REFERENCES:
patent: 4199869 (1980-04-01), Van Steenwyk
patent: 4293046 (1981-10-01), Van Steenwyk
patent: 4399692 (1983-08-01), Hulsing et al.
patent: 4433491 (1984-02-01), Ott et al.
patent: 4461088 (1984-07-01), Van

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