Method and apparatus for trelemetry while drilling by changing d

Details Method and apparatus for trelemetry while drilling by changing d Method and apparatus for trelemetry while drilling by changing d

1986-02-26

1988-08-09

Smith, Jerry

Boots, shoes, and leggings

340853, G01V 140

Patent

active

047632585

ABSTRACT:
The cyclic angular dependence of the output of gravitational inclinometers and magnetometers is used to communicate from the well surface to a microprocessor downhole. The microprocessor controls an arbitrary downhole function. Information is communicated to the microprocessor via the inclinometer and magnetometer by selectively rotating the drill string during a data time interval through a predetermined magnitude of angular displacement or angular velocity. Each additional multiple of angular displacement or angular velocity is interpreted as a distinguishable unit of information. A command word is assembled from a sequential plurality of units of information in the microprocessor and a downhole function is executed according to the command word.

REFERENCES:
patent: 3967680 (1976-07-01), Jeter
patent: 4479564 (1984-10-01), Tanguy
patent: 4647853 (1987-03-01), Cobern

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