Setting device for windowing sidetrack drilling

Abstract

The invention discloses a setting device for windowing sidetrack drilling. The device comprises a barrel body assembly, an input head and a center shaft, wherein a slip groove is formed in a barrel wall of the barrel body assembly, and a slip is arranged in the slip groove; the input head is rotatably and axially movably arranged in the barrel body assembly, and the input head is used for being connected with an external whipstock; the center shaft is rotatably and axially movably arranged in the barrel body assembly and is in transmission connection with the input head, the center shaft is provided with a cam cone, the cam cone is provided with a large end and a small end, the cross section of the cam cone is in a cam shape, when the center shaft moves to the slip ejection position in the direction from the small end to the large end relative to the barrel body assembly, the center shaft is axially positioned at the slip ejection position relative to the barrel body assembly, the cam cone pushes the slip to turn over outwards, the center shaft rotates relative to the barrel body assembly to the high point of the outer cam surface of the cam cone to act on the slip, and the cam cone pushes the slip to turn over outwards by a larger angle. The meshing force between the slip and a casing pipe is increased, and the risk of slippage in the windowing sidetrack drilling process is reduced.

Description

technical field [0001] The invention relates to the technical field of oil and gas drilling, in particular to a setting device for window sidetracking. Background technique [0002] In the oil and gas industry, as oilfield development enters the middle and later stages, long-term injection and production, formation movement, falling objects and other reasons have caused more and more low-efficiency wells, wells with casing damage, and abandoned wells. Re-drilling wells will inevitably lead to a substantial increase in oil production costs. raised. Relevant research and engineering applications have proved that there are still a large number of remaining oil reservoirs in the near-wellbore area of ​​a large number of abandoned old wells, and the use of window sidetracking technology can effectively exploit these remaining oil reservoirs and greatly reduce oil recovery costs. Window sidetracking technology refers to opening a window on the side wall of the original wellbore c...

AI Technical Summary

Problems solved by technology

[0004] The currently used sidetracking setting device, after the first setting is lost, during the sidetracking process of opening the window, under the influence of various factors such as the drilling pressure and cutting torque applied to the inclined device by the drill bit, and mechanical vibration, there will be a settling effect. The seal is loose, creating the risk of slipping and falling

Once slippage occurs, the wellbore trajectory cannot follow the designed trajectory, and even the window sidetracking operation cannot be continued

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