A setter for side-drilling windows

Abstract

The present application discloses a setter for side-drilling windows, comprising: a barrel assembly, the barrel wall of which is provided with a slip groove, and the slip groove is provided with a slip; an input head is rotatable and can move axially It is arranged in the cylinder body assembly, the input head is used to connect with the external oblique device; the central shaft is rotatably and axially movable in the cylinder body assembly, and is connected with the input head, and the central shaft is provided with a cam cone , which has a large end and a small end, and its cross-sectional shape is a cam shape. As the central shaft moves relative to the cylinder assembly in the direction from the small end to the large end to the position where the slips are ejected, the central shaft is axially relative to the cylinder assembly. It is positioned at the ejection position of the slip, and the cam cone pushes the slip to turn outward. As the central shaft rotates relative to the cylinder assembly to the high point of the outer cam surface of the cam cone, it acts on the slip, and the cam cone pushes the slip to the side. The angle of the outward flip increases. Increased slip and casing engagement, reducing the risk of slippage during sidetracking.

Description

technical field [0001] The invention relates to the technical field of oil and natural gas drilling, in particular to a setting device for side drilling with a window. Background technique [0002] In the oil and gas industry, as oilfield development enters the middle and late stages, there are more and more inefficient wells, casing damaged wells, and scrapped wells caused by long-term injection and production, formation movement, falling objects, etc., and re-drilling wells will inevitably lead to a significant increase in oil production costs. rise. Relevant research and engineering applications have proved that there are still a large number of remaining oil reservoirs in the near-wellbore zone 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 the cost of oil production. Windowed sidetracking technology refers to opening a window on the sidewall of the origina...

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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