Eccentric mechanism of dynamic pointing type rotary guiding well-drilling tool

Abstract

The invention discloses an eccentric mechanism of a dynamic pointing type rotary guiding well-drilling tool. An external eccentric ring frameless direct-driving motor encoder is connected with an external eccentric ring flange, the external eccentric ring flange is connected with an external eccentric ring frameless direct-driving motor, and an external eccentric ring frameless direct-driving motor rotor is connected with an external eccentric ring; the outer wall of the external eccentric ring is matched with an external eccentric ring holding bearing, the outer wall of the external eccentric ring holding bearing is matched with the inner wall of a rotary outer sleeve, and the inner wall of the external eccentric ring is matched with the outer walls of an internal eccentric ring fitted bearing and an external eccentric ring fitted bearing; the inner walls of the internal eccentric ring fitted bearing and the external eccentric ring fitted bearing are matched with the outer wall of an internal eccentric ring, and the inner wall of the internal eccentric ring is matched with the outer wall of the internal eccentric ring fitted bearing; and an internal eccentric ring frameless direct-driving motor rotor is connected with an internal eccentric flange, and the internal eccentric flange is connected with an internal eccentric ring frameless direct-driving motor encoder. Control of the eccentric mechanism over the internal eccentric ring and the external eccentric ring is achieved mainly by controlling frameless direct-driving motors, so that tool guiding is achieved, and accurate control of well track is achieved.

Description

technical field [0001] The invention relates to a rotary steerable drilling tool in the field of drilling, in particular to an eccentric mechanism of a dynamic pointing rotary steerable drilling tool. Background technique [0002] The current downhole rotary steerable drilling tools can basically be divided into four types according to the working mode: static offset pushing type, dynamic offset pushing type, static offset pointing type and dynamic offset pointing type. The disadvantage of the static offset push-on type is poor miniaturization ability and complex structure; the disadvantage of the dynamic offset push-on type is that the wear of the drill bit and the drill bit bearing is serious, and the working life is short; the disadvantage of the static offset pointing type is that the core bearing is affected by high strength. The mandrel is prone to fatigue damage due to the alternating stress. As a new design concept, the dynamic pointing rotary steerable drilling too...

AI Technical Summary

Problems solved by technology

This patent introduces a dynamic pointing rotary steerable drilling tool as a whole, but does not explain the specific structure of the eccentric mechanism of the drilling tool

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