Well tool for detecting well bore deviation in drill string

Details Well tool for detecting well bore deviation in drill string Well tool for detecting well bore deviation in drill string

1980-07-18

1983-02-01

Stephan, Steven L.

Geometrical instruments

Indicator of direction of force traversing natural media

Borehole direction or inclination

E21B 4722

Patent

active

043708145

ABSTRACT:
A well tool for detecting well bore deviation which includes a tool adapted to be connected between adjacent components of a drill string, including a longitudinal opening through which drilling fluid can be circulated. At least one vent hole is located in the tool wall for communicating the longitudinal opening with the space outside the tool through which drilling fluid is circulated back to the surface, the vent hole being selectively blocked and unblocked. The angle the tool has deviated from vertical is measured and the vent is unblocked at a time interval after weight is placed on the bit which is determined by the amount of deviation of the tool, the unblocking of the vent causing a pressure drop in the drilling fluid in the tool the timing of which indicates the amount of deviation.

REFERENCES:
patent: 2887298 (1959-05-01), Hampton
patent: 3077233 (1963-02-01), Armstrong
patent: 3124882 (1964-03-01), Black
patent: 3303573 (1967-02-01), Alder et al.

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