Unilateral push-the-bit guide nipple

An oil cylinder and jacket technology, applied in directional drilling, impact drilling, rotary drilling, etc., can solve the problems of small mud flow, unsuitability, harsh construction environment, etc., and achieve the effect of precise control and convenient lowering.

Active Publication Date: 2017-05-10
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 c

Method used

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  • Unilateral push-the-bit guide nipple
  • Unilateral push-the-bit guide nipple

Examples

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[0022] In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of the embodiments of the present invention, not all the embodiments. The components of the embodiments of the present invention generally described and illustrated in the drawings herein may be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinar...

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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...

Claims

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Application Information

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IPC IPC(8): E21B7/06E21B3/02E21B17/00E21B17/18
CPCE21B3/02E21B7/06E21B17/00E21B17/18
Inventor 刘宝林王瑜孔令镕王志乔吕建国周琴张凯邓守层钱程远侯来杰
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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