DEVICE FOR DRILLING OF SLANT BOREHOLES Russian patent published in 2009 - IPC E21B7/04 E21B17/10 

FIELD: oil and gas production.

SUBSTANCE: invention relates to gas-and-oil producing industry, particularly to equipment for drilling practice stabilisation at round-trips and passing of curved sections. It includes casing-bearing, compaction unit, oil-filled cavity, journal and plain thrust bearings, fittings. Casing-bearing is implemented immovable, T-shaped, where it is shaft, connected to drill pipes or cutting tool. Between casing-bearing and fitting it is casing for placement of sealant set from thermal expanded graphite in the form of rings. External surfaces of casing-bearing and casing for placement of sealant set form working area of device. On external surface of casing-bearing it is located element in the form of ring or rings with finger-shaped radial surfaces. Between surface of casing-bearing and this element there are oil-filled cavities, in which located in pairs roller thrust and bearing and journal needle frictionless bearings. On external faceplates of fitting and casing for placement of sealant set it is annular groove, in which it is installed floating bush with ability of alternate motion.

EFFECT: improving drilling process ensured by increasing of chatter stability of whole arranging, increases penetration rate of cutting tool by curved borehole ensured by reduction of dynamic loads to arranging, and also decreases rotational moment on drill pipes and wear of drill and casing tubes.

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