Static directional build-up rate controllable guide drilling tool

Abstract

The invention relates to the technical field of high-end underground equipment, in particular to a static directional build-up rate controllable guide drilling tool which comprises a torque transmission positioning device and a flexible controllable guide device which are in threaded connection. The torque transmission positioning device is composed of an upper connector, a telescopic spline shaft, a semicircular connector, an outer pipe, a spline shaft sleeve, a main transmission shaft, a bearing string, a spring, a probe and a positioning guide pipe connector. The flexible controllable guiding device is composed of a spline flexible short section, a guiding pipe, a guiding pipe lower connector and a drill bit connector. According to the drilling tool, overall positioning of the drilling tool is achieved through the probe in the positioning guide pipe connector, the guide direction of the drilling tool is finally determined through the phase difference between the probe and the tile-shaped curved surface kerfs in the guide pipe, the guide pipe and the multiple spline flexible short sections in the guide pipe can be bent and inclined towards the side with the tile-shaped curved surface kerfs, and therefore controllable guide drilling is achieved. The device has the advantages of being adjustable in build-up rate, static in pointing, simple in structure and easy to operate.

Description

technical field [0001] The invention relates to the technical field of high-end downhole equipment, in particular to a static pointing type controllable steerable drilling tool. Background technique [0002] At present, domestic soil and groundwater pollution is prominent, and it has shown a trend of developing from point-like pollution to belt-like and surface-like pollution. The in-situ repair method for large-scale contaminated sites requires a large number of vertical repair holes to be drilled in the contaminated site, resulting in large drilling workload, small diffusion radius of repair agents, long construction period and high cost. Horizontal well technology can effectively reduce the number of vertical holes and increase the area of ​​single-hole radiation repair. The key to the multi-branch horizontal well technology is the inclination of the wellbore, so that the inclination angle reaches or approaches 90°, and the wellbore has a certain length along the horizon...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortcomings of the existing steering and deflection tools in the soil layer and broken and loose formation that it is difficult to build deflection horizontally, the deflection rate is large, and the orientation and inclination angle of the directional drilling are difficult to control. Stable inclination, steerable drilling azimuth and well inclination angle are easy to control, and the static pointing type steerable drilling tool with controllable build-up rate is easy to operate

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