ORIENTATION DEVICE Russian patent published in 2006 - IPC E21B7/08 

FIELD: well drilling equipment, particularly special apparatus for deflecting horizontal side bores during bore drilling with the use of downhole motor.

SUBSTANCE: orientation device adapted to be used in downhole assemblies for multi-branch well repair comprises composite body, piston with hollow rod and outer straight spiral splines arranged in the body. Installed in the body are return spring and spindle with hollow shaft. The return spring is located in cavity under the piston and connected with buffer cavity by means of dividing spring-loaded annular piston. The buffer cavity is communicated with space behind the body through drainage window. Hollow spindle shaft is kinematically connected with hollow rod by means of jaw clutch including movable upper and lower fixed collars. The upper jaw clutch collar is brought into engagement with spiral splines. The lower jaw clutch collar is fastened to composite body. The collars may engage ratchet crown of hollow shaft by means of spring-loaded ratchet fixers, which are made as plates installed in blind wedge-like sockets so that the plates may perform limited movement in the sockets. The sockets are provided with cylindrical bottoms. Fixer springs are located in blind holes made in collars. Cavity under the piston is divided into two halves connected with each other by throttling channel. The throttling channel is defined by space between inner and outer cylindrical surfaces of fixed collar and hollow spindle shaft.

EFFECT: increased reliability and service life of the device.

3 cl, 6 dwg