Surface controlled auxiliary blade stabilizer

Details Surface controlled auxiliary blade stabilizer Surface controlled auxiliary blade stabilizer

1983-06-29

1985-01-01

Novosad, Stephen J.

Boring or penetrating the earth

With tool shaft detail

Shaft carried guide or protector

166241, 308 4A, E21B 1710

Patent

active

044911874

ABSTRACT:
Surface controlled blade stabilizer apparatus, for which surface control is achieved by alteration of internal drill string pressure to move a piston which carries an actuator for expanding the stabilizer blades, the blades being spring biased inwardly when not forced outwardly by the actuator. A barrel cam controls and guides the actuator to downward, upward and intermediate positions, so that the blades may be expanded, retracted, or held expanded when drill string pressure is reduced. The apparatus has a full open passage therethrough which is not interfered with by operation of the apparatus.

REFERENCES:
patent: 1921135 (1933-08-01), Santiago
patent: 2170452 (1939-08-01), Grant
patent: 2427052 (1947-09-01), Grant
patent: 3126065 (1964-03-01), Chadderdon
patent: 3703104 (1972-11-01), Tamplen
patent: 4081042 (1978-03-01), Johnson et al.

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