DEVICE FOR DIRECTIONAL DRILLING Russian patent published in 2004 - IPC

FIELD: drilling equipment, particularly for boring directionally drilled and inclined wells and for well inclination angle change.

SUBSTANCE: device has hollow body with support end. Installed in hollow body is rod adapter with movable rest for providing cooperation between rod adapter end having support end of hollow body and with outer extension formed on rod adapter. Device also comprises semi-axle or axis of rotation arranged in plane perpendicular to device axis, O-ring and sealing bushing with spherical working surfaces located at bushing ends. Lower working surfaces of sealing bushing may cooperate with rod adapter. Rod adapter is rotatably installed inside hollow body. Device is provided with upper sub arranged in hollow body and connected with body by means of semi-axles or axis of rotation. O-ring is placed on upper sub to provide cooperation with hollow body end. Movable rest is formed as locking nut secured by means of additional left-handed thread made on rod adapter. O-ring may slide along hollow body end and is spring-loaded. Upper end of sealing bushing is located in upper sub above semi-axles or axis of rotation. Lower end of sealing bushing is arranged in rod adapter under semi-axles or axis of rotation.

EFFECT: increased reliability and service life.

3 cl, 2 dwg