DEFLECTION DEVICE Russian patent published in 2015 - IPC E21B7/08 E21B29/06 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to oil and gas well drilling and aims at casing window cutting and further auxiliary hole drilling. A deflection device comprises a whipstock with an inclined working surface configured in the form of a chute in an applied carbide mill, an anchor connected to the whipstock through an adapter bushing, a high-pressure flexible tube, a whipstock fixation unit. A chute portion from both sides from below is machined to reduce a stagnant portion, while a low-pressure chamber for transferring the device into the transport position is a shank bore of the anchor with a plunger inside. The adapter bushing comprises a piston used to press the whipstock to the casing pipe, and its profile bevel comprises disk spring washers in a socket for pressing the whipstock head to the boring casing after the cutter detachment.

EFFECT: higher technical and process drilling factors of multi-lateral wells.

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