DEVICE FOR STABILIZATION OF INCLINED WELL BORE IN DRILLING WITH DOWNHOLE MOTOR Russian patent published in 1995 - IPC

FIELD: well drilling. SUBSTANCE: device for stabilization of inclined well bore in drilling with downhole motor has cone bit, bit sub, three calibrators with two flywheels between them, spindle of sectional turbodrill and two centralizers on bodies of spindle and turbodrill. Bit sub has directed upward colmatage nozzle in form of abrasion-resistant sleeve with tangential inlet holes near bottom parts built in steel cover. Made in diagonally opposite blades of third calibrator are coaxial through channels for horizontal hard-alloy pipe with tangential slotted hole in the middle part and diffusers at the ends. Pipe is fixed with clamping nuts deepened in blade and having taper recesses being as extensions of diffusers. EFFECT: higher degree of stabilization of straight-inclined well section with decreased probability of occurrence of complications with multicentralizer assembly of drill string bottom part. 2 cl, 3 dwg