Unilateral push-the-bit guide nipple

Abstract

The invention discloses a unilateral push-the-bit guide nipple which comprises an oil cylinder outer sleeve, an oil cylinder, an inner drill rod and a support plate, wherein the inner drill rod is supported in the oil cylinder outer sleeve by a bearing in a hanging manner, an accommodating cavity corresponding to the support plate in the shape is formed on the outer wall of the oil cylinder outer sleeve, at least one pressure relief hole communicated with an inner cavity of the oil cylinder outer sleeve is formed at the bottom of the accommodating cavity, the oil cylinder is arranged in the pressure relief hole(s), the oil cylinder slides relative to the hole wall(s) of the pressure relief hole(s), the hole wall(s) and the oil cylinder are sealed by a sealing ring, and a piston of the oil cylinder is fixedly connected with the support plate. According to the unilateral push-the-bit guide nipple disclosed by the invention, the extending length of the support plate can be adjusted by adjusting the pressure of drilling fluid within a certain range, so as to adjust the build-up rate of a drilling tool.

Description

technical field [0001] The invention relates to the field of geological drilling, in particular to a single-side pushing type guide joint. Background technique [0002] In the existing drilling technology, the sandy pebble formation is the main aquifer, but the sandy pebble formation is soft and hard, with poor cementation, and is particularly difficult to drill into. The main problem caused by the staggered soft and hard sand and pebble formation is that the drilling direction is difficult to control, and the problem caused by poor cementation is mainly the poor stability of the borehole wall, which is easy to collapse the hole. At present, the down-the-hole hammer and pipe drilling technology is an effective method for drilling sand and pebble formations, but the down-the-hole hammer and pipe drilling can only be used in non-water formations and the drilling efficiency is low. The double-walled drill pipe is connected to the ground dual-power-head drilling rig, and the ou...

AI Technical Summary

Problems solved by technology

Third, the mud flow rate is small, so it is not suitable for use in leakage formations

[0005] The limitations of the traditional construction method are: (1) Since the construction personnel have to go down into the narrow shaft, the construction environment is particularly harsh and the safety is poor

(2) Due to the limited space, the ability of the percussion rotary drilling rig is greatly limited, resulting in the length of the radiation hole being greatly limited

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