WHIPSTOCK Russian patent published in 2000 - IPC

FIELD: oil and gas production industry. SUBSTANCE: whipstock relates to deviating devices used in drilling of directed wells from main bore-hole of well. Whipstock has support with slip made with relief on external side. Made in body of slip at external side is slot. Support and wedge are fastened together by stud. Wedge is manufactured as integral and includes thrusting part and deviating part. Made in surface of thrusting part of wedge is guide member in the form of T-shaped protrusion which connects wedge with slip. Located on support axle behind slip is stud. Deviating part of wedge has two work surfaces: one work surface is with cut thread, other work surface is made in the form of trough which is inclined in wedge axle at top part of deviating part of wedge at 1.5-2 deg. Made in upper deviating part of wedge is hole with thread for bolt which keeps wedge in suspender. Provided around threaded hole is protrusion of calculated thickness to ensure alignment of wedge and suspender. Slip at external side is made in the form of regular four-face pyramids. Made in slip body at internal side is T-shaped slot corresponding to T-shaped protrusion on guiding thrusting part of wedge. Aforesaid embodiment of device ensures high reliability in operation. EFFECT: higher efficiency. 1 cl, 4 dwg