Integrated window sidetrack drilling tool

Abstract

The invention discloses an integrated window sidetrack drilling tool. The integrated window sidetrack drilling tool comprises a hollow tapered mill, a wedge deflection tool deflection iron and a setting and anchoring member which are sequentially connected, the wedge deflection tool deflection iron is clamped in an arch-shaped dovetail groove on the lower portion of the tapered mill, a positioning bolt is arranged between the upper end of the wedge deflection tool deflection iron and the tapered mill, and a liquid guide tube is arranged in the wedge deflection tool deflection iron. The integrated window sidetrack drilling tool is characterized in that an auxiliary liquid hole corresponding to the positioning bolt is arranged on the tapered mill, a blind hole communicated with the auxiliary liquid hole is arranged on the positioning bolt, the auxiliary liquid hole is blocked by the positioning bolt when the wedge deflection tool deflection iron and the tapered mill are clamped, and an inner hole of the tapered mill is communicated with the outside through the auxiliary liquid hole and the blind hole of the positioning bolt when the positioning bolt is cut. The integrated window sidetrack drilling tool has the advantages of being capable of avoiding pump choking caused by the blocking of a nozzle of the tapered mill, guaranteeing drilling pressure can be fully added during windowing, and improving milling speed to enhance the efficiency of windowing; and completing the fixing of the wedge deflection tool and the windowing and window repair of the tapered mill through a trip of drilling to greatly improve work efficiency and reduce construction cost and labor intensity.

Description

technical field [0001] The invention belongs to workover tools, in particular to an integrated sidetracking tool for opening windows. Background technique [0002] Sidetracking tools include deflectors and milling cones for sidetracking in wells. The deflector and milling cone of the traditional window sidetracking tool are two independent tools. During the sidetracking operation of the window, the deflector is connected to the feeder and the drilling tool is lowered to the predetermined position in the well. Drilling design requires adjusting the slope orientation of the deflector, then fixing the deflector in the well through hydraulic or mechanical setting, and then separating the feeder from the deflector by rotating or pulling and pressing the drilling tool, and then pulling out the drilling tool and feeding Insert the device and replace the milling cone for window opening. Because the sidetracking wells are relatively deep, each trip of the drill not only takes a lon...

AI Technical Summary

Problems solved by technology

CN2679348 connects the milling cone and the deflector with screws. Since the upper end of the deflector is a wedge-shaped tip, the connection coaxiality deviation of this connection structure is relatively large, which makes it very difficult to go down the well, and accidental fall of the deflector often occurs.

However, the milling cone in CN201756914 is connected with the skew guide through a connecting sleeve. Due to the limitation of the size of the skew guide and the milling cone and the opening of the window, the connecting sleeve must be milled off earlier, so the connecting sleeve can only be made thinner, resulting in The connecting sleeve is easily deformed when drilling, which will cause a large deviation in the coaxiality between the milling cone and the deflector, resulting in the tool being blocked and unable to go down to the predetermined position, so there is no successful application example of this tool so far

[0004] The invention patent CN102364029A applied by our company discloses an integrated window sidetracking tool. The milling cone of this tool is the same as the commonly used milling cone. The nozzle hole is set on the milling cone head. In some formations, the nozzle hole is easily blocked by the formation or cement, which will cause pressure suppression. In order to relieve the pressure caused by the pressure suppression, it is necessary to reduce the drill pressure, which reduces the milling speed and reduces the window opening efficiency.

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