DEVICE FOR DRILLING SIDE BOREHOLES FROM CASED WELL Russian patent published in 2005 - IPC

FIELD: drilling equipment, particularly for deflecting the direction of boreholes.

SUBSTANCE: device includes deflecting wedge with fastening mechanism made as corrugated tube with one sealed end and sub disposed between deflecting wedge and fastening mechanism. Device also has channel to supply fluid into corrugated tube, movable joint between sub and wedge and cutting tool. Device also comprises holding unit for deflecting wedge installed in the sub and made as a piston with rod and fixing means arranged in hydraulic cylinder. Hydraulic cylinder interior communicates with that of corrugated tube. Upper rod part is installed to cooperate with lower part of the wedge from guiding plane side. Channel for flushing fluid supplying is made as hydraulic line connecting drill pipe interior and that of cutting tool with corrugated tube interior, wherein the cutting tool is secured to upper part of deflecting wedge by means of shear bolt.

EFFECT: increased rigidity of deflecting wedge fixation in casing pipe of the well.

3 cl, 2 dwg