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A method for counteracting circumferential friction of double-layer drill pipe and double-layer drill pipe

A double-layer drill pipe, hexagonal technology, applied in drill pipe, drill pipe, earthwork drilling, etc., can solve the problem of low drilling trajectory control accuracy in broken and soft coal seams, ensure safe and efficient mining, and improve coal seam drilling rate , the effect of avoiding the blind spot of drainage

Active Publication Date: 2020-08-25
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the defects and deficiencies in the prior art, the present invention provides a method for counteracting the circumferential friction of double-layer drill pipes and double-layer drill pipes, which overcomes the defect of low control precision of drilling trajectory in broken and soft coal seams

Method used

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  • A method for counteracting circumferential friction of double-layer drill pipe and double-layer drill pipe
  • A method for counteracting circumferential friction of double-layer drill pipe and double-layer drill pipe
  • A method for counteracting circumferential friction of double-layer drill pipe and double-layer drill pipe

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Embodiment 1

[0040] This embodiment provides a method for counteracting the circumferential friction of a double-layer drill pipe. In this method, a TC bearing and an external gear bushing are arranged coaxially between the outer pipe and the inner pipe assembly of the double-layer drill pipe. When the outer pipe rotates At the same time, the TC bearing and the outer gear sleeve produce circumferential friction in the opposite direction to the inner pipe assembly, thereby offsetting the circumferential friction of the double-layer drill pipe; The TC bearing is arranged between the hexagonal joint and the end of the inner pipe body, and the outer gear shaft is sleeved between the hexagonal sleeve and the end of the inner pipe body; the outer gear sleeve can be connected with the outer The tube rotates in reverse.

[0041] Specifically, the rotation of the outer tube can drive the TC bearing to rotate, and the rotation of the TC bearing causes the inner tube assembly to generate circumferent...

Embodiment 2

[0044] like Figure 1 to Figure 6 As shown, this embodiment provides a double-layer drill rod, which can realize the above-mentioned method of offsetting the circumferential friction of the double-layer drill rod. Into 2, TC bearing 3 and outer gear bushing 4 are arranged coaxially between outer pipe 1 and inner pipe assembly 2; inner pipe assembly 2 includes hexagonal joint 21, inner pipe body 22 and hexagonal The sleeve 23 and the TC bearing 3 are arranged between the hexagonal joint 21 and the end of the inner pipe body 22, and the outer gear sleeve 4 is arranged between the hexagonal sleeve 23 and the end of the inner pipe body 22;

[0045] The end of the outer tube 1 is connected with an internal gear joint 5 , and a planetary gear 6 meshing with the gears of the internal gear joint 5 and the external gear sleeve 4 is arranged between the internal gear joint 5 and the external gear sleeve 4 .

[0046] In this embodiment, the inner pipe assembly 2 includes a hexagonal joi...

Embodiment 3

[0060] This embodiment provides a drilling system, which includes a plurality of double-layer drill rods described in Embodiment 2; the drilling system also includes a flexible internal control rotary directional drilling tool, an orientation system, a drill bit and a dual power head Drilling machine; the directional system includes an upper non-magnetic drill rod, a lower non-magnetic drill rod, an outer probe tube, and a measurement probe tube, and the measurement probe tube is connected to the mandrel of a flexible internal control rotary directional drilling tool through a transition inner tube; The outer pipe at the bottom of the double-layer drill pipe hole is connected to the upper non-magnetic drill pipe, and the inner pipe is connected to the measuring probe through the transition inner pipe. The double-layer drill pipe extends from the rear end of the non-magnetic drill pipe at the bottom of the hole to the hole At the dual power head drilling rig. The drilling syste...

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Abstract

The invention discloses a method for offsetting the circumferential friction resistance of a double-layer drill stem and the double-layer drill stem. In the method, a TC bearing and an outer gear shaft sleeve are coaxially arranged between an outer pipe and an inner pipe assembly of the double-layer drill stem, when the outer pipe rotates, the TC bearing and the outer gear shaft sleeve generate opposite circumferential frictional resistance to the inner pipe assembly, and thus the circumferential friction resistance of the double-layer drill stem is offset. By means of the method, the circumferential frictional resistance generated by the inner pipe assembly in the rotating state of the outer pipe can be offset, and the phenomenon of circumferential torsion of the hole bottom section of the inner pipe assembly is avoided; the stability of the tool face angle of a hole bottom drill is improved, the drilling trajectory control difficulty is lowered, and the control precision is improved;the problem that when forced rotation is adopted for handling the accident that a drill gets stuck in a hole, the drill releases load suddenly due to the torsion state, then an outer pipe rebounds and rotates rapidly, and consequently an inner pipe assembly is reversely detached is avoided; the problem of low strength of small-diameter through cable joints is solved, a sufficient air supply passage at a small-diameter inner pipe joint is ensured, and the wind force loss is controlled within an allowable range.

Description

technical field [0001] The invention belongs to the technical field of underground drilling in coal mines, and in particular relates to a method for offsetting circumferential friction of double-layer drill pipes and the double-layer drill pipes. Background technique [0002] At present, the rotary drilling technology of the broken soft coal seam in the underground coal mine cannot control the drilling trajectory, resulting in a low rate of coal seam drilling in the broken soft coal seam, and at the same time, it is easy to cause the emergence of blind areas in the coal mining face, which seriously affects the safety of the broken soft coal seam. Mining efficiently. The rotary directional drilling system for broken soft coal seams in conventional coal mines is divided into outer pipe and inner pipe assembly. The clockwise rotation of the outer pipe during the construction of the inner and outer pipe drilling tools causes the inner pipe to produce circumferential friction, es...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B17/00E21B17/02E21B17/04
CPCE21B17/00E21B17/023E21B17/04
Inventor 徐保龙王力王毅金新朱宁
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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