Torsional wave generator

Details Torsional wave generator Torsional wave generator

1979-03-19

1981-08-11

Birmiel, Howard A.

Communications, electrical: acoustic wave systems and devices

Wellbore telemetering

Through drill string or casing

175 40, 175 50, G01V 140

Patent

active

042837790

ABSTRACT:
A torsional acoustic wave generator for use in an acoustic drill-string telemetry system, the generator having a reaction mass rotatably mounted near the lower end of a drill string, and a fluid coupling for generating a torque between the reaction mass and the drill string and thereby applying a sudden torsional pulse to the drill string. In the disclosed embodiment of the invention, the fluid coupling comprises a number of chambers rigidly connected to the reaction mass, an equal number of vanes rigidly connected to the drill string and disposed in the cylinders, and a mud control valve for selectively directing drilling mud into the chambers to generate a torque between the chambers and the vanes, and thereby apply to the drill string a torsional pulse that is independent of such factors as drill-string angular velocity.

REFERENCES:
patent: 3805606 (1974-04-01), Stelzer
patent: 3813656 (1974-05-01), Fowler
patent: 3900827 (1975-08-01), Lamel et al.
patent: 3906435 (1975-09-01), Lamel et al.

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