Integrated window sidetrack drilling tool

Abstract

The invention discloses an integrated window sidetrack drilling tool which comprises a hollow cone mill bit, wedge deflection tool tapered iron and a setting and anchorage device which are sequentially connected. A liquid guide pipe is arranged in the wedge deflection tool tapered iron. The lower end of the liquid guide pipe is connected with a jet pipe in the setting and anchorage device. A setting ball is arranged at the lower end of an inner hole of the jet pipe. The upper portion of the setting ball is clamped to the annular upper clamping edge of the jet pipe. A limiting structure or limiting adhesive tape is arranged at the lower end inside the jet pipe. The setting ball is clamped to the upper clamping edge during downward drilling. An annular lower clamping edge is arranged at the lower end of an inner hole of a lower cone body of the setting and anchorage device. During setting operation, the setting ball breaks through the limiting structure or the limiting adhesive tape under pushing of a high-pressure drilling fluid and falls off to be clamped to the lower clamping edge to achieve setting. By adoption of the integrated window sidetrack drilling tool, the situation that the drilling fluid in a drill stem in the downward drilling process generates excited pressure, and halfway error setting is caused can be avoided, the situation that tripping-out is too fast, pumping is generated, and halfway error setting is caused can also be avoided, operation is reliable, the operating efficiency can be improved, and the operating cost is lowered.

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 the deflector. Feed 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 ...

AI Technical Summary

Problems solved by technology

[0006] 1. Since there is no channel to release the exciting pressure of the drilling fluid, once the drill stops due to operational errors during the tripping process, the drilling fluid entering the tool will easily cause the slips of the setting and anchoring device to move and cause a misplaced position midway When the tool is stuck in the wellbore by missetting, the tool can only be lifted or pressed down forcibly. If the tool is stuck and the jam cannot be released by lifting or pressing down, the milling cone can only be pulled out by destructive lifting. After pulling out the milling cone, lower the milling tool to grind off the inclined iron of the deflector and the setting and anchoring device. During milling, not only is it difficult to mill, but it is also easy to wear out the original wellbore casing and cause the wellbore to be scrapped. Mis-setting not only takes a long time and costs a lot, but also has a low probability of success, which can easily cause accidents in the well and even lead to the scrapping of the wellbore

[0007] 2. During the tripping process, the inner hole of the liquid guide pipe and the milling cone is easily blocked by foreign matter such as heavy oil in the well, resulting in the failure of the integrated sidetracking tool to be set, or the failure of the logging instrument to go down properly, or due to obstruction in the middle The tool itself cannot reach the predetermined position and other complicated situations. Once these complicated situations occur, the tool must be pulled out. Since the gap between the tool and the wellbore is only about 3mm, the one-way valve in the lower cone of the tool puts the tool inside , outside the drilling fluid, if the drilling speed is fast, it will generate a considerable suction force, and this suction force is enough to pull the lower cone and force the slips to move and cause mis-setting, so the drilling speed should be controlled If the drilling speed is less than a quarter of the normal drilling speed, the operating efficiency is obviously greatly reduced and the operating cost is increased.

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