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Anti-backflow directional drill bit with back flushing function and construction method thereof

A technology of directional drilling and reverse flushing, which is applied in directional drilling, flushing boreholes, drill pipes and other directions, and can solve problems such as difficulty in raising the bottom of the hole for directional drilling tools and damage to the screw motor

Active Publication Date: 2021-06-08
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

[0004] Aiming at the defects and deficiencies in the prior art, the present invention provides an anti-backflow directional drill bit with reverse flushing function and its construction method, which are used to solve the damage of the screw motor and the orientation after the drill bit is stuck due to the backflow of drilling slag carried by the flushing medium. Drilling tools are difficult to raise the bottom of the hole

Method used

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  • Anti-backflow directional drill bit with back flushing function and construction method thereof
  • Anti-backflow directional drill bit with back flushing function and construction method thereof
  • Anti-backflow directional drill bit with back flushing function and construction method thereof

Examples

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Embodiment 1

[0041] This embodiment provides an anti-backflow directional drill with reverse flushing function, such as Figure 1 to Figure 5 As shown, it includes a drill bit 1, a lower connecting member 2 connected with the drill bit 1, and an upper connecting member 3 connected with the lower connecting member 2 and able to move axially.

[0042] The lower connecting member 2 includes a cylindrical body 201 and a central channel 202. The two ends of the cylindrical body 201 are respectively the connecting end and the limiting end. The inner wall of the cylindrical body 201 from the connecting end to the limiting end is the first inner wall 203, the first Annular protrusion 204, the second inner wall 205, the second annular protrusion 206 and the third inner wall 207; the second inner wall 205 is provided with a plurality of circumferentially arranged oblique through holes 208, and the third inner wall 207 is provided with many A through hole 209 arranged in the circumferential direction...

Embodiment 2

[0055] This embodiment provides a construction method of an anti-backflow directional drill bit with a backwashing function, which is implemented by the directional drill bit of Embodiment 1, and includes the following steps:

[0056] Step 1: Connect the directional drill bit with the power drilling tool and the drill pipe in sequence, put it into the bottom of the hole through the drilling rig, and apply drilling pressure to carry out directional drilling. At this time, the upper connecting member compresses the spring, and the flushing medium passes through the central flow channel and the lateral fluid The through hole is connected with the inner cavity of the drill bit and the water hole of the drill bit, which can carry rock powder for cooling the drill bit;

[0057] Step 2: After one round of directional drilling is completed, the drilling tool is lifted away from the bottom of the hole. At this time, under the action of the spring, the upper connecting member moves up to...

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Abstract

The invention discloses an anti-backflow directional drill bit with a back flushing function and a construction method thereof. The directional drill bit comprises a drill bit body, a lower connecting component connected with the drill bit body and an upper connecting component which is connected with the lower connecting component and can move axially; when a ball head threaded pin is clamped in a positioning long groove till the upper connecting component cannot move upwards, a lateral fluid through hole is located in a second inner wall annulus and can communicate with an oblique through hole, pressure relief can be conducted through a nozzle mounted in the oblique through hole, back flushing drilling is continued, meanwhile, a drill bit flushing channel is closed, and a flushing medium is prevented from carrying rock powder to flow back; and when the upper connecting component is pressed downwards, a spring is compressed, the lateral fluid through hole can extend to an annulus opposite to a first inner wall to communicate with a drill bit water hole in the drill bit body, and thus supply of the drill bit flushing medium is ensured. The anti-backflow directional drill bit can be used for preventing the situation that the flushing medium carries drilling slag to flow back to a hole bottom power drilling tool, and consequently the power drilling tool is damaged, and can also be used for accident handling construction after jamming of the drilling tool in directional drilling of a stratum where hole collapse is prone to occurring.

Description

technical field [0001] The invention belongs to the technical field of directional drilling, and relates to an anti-backflow directional drill bit with reverse flushing function and a construction method thereof, which is used to prevent the damage caused by the backflow of drilling slag carried by the flushing medium to the power drilling tool at the bottom of the hole. Accident treatment and construction after drill stuck in directional drilling in strata prone to collapse. Background technique [0002] With the development of directional drilling technology, directional drilling technology in coal mines is widely used in gas drainage, water exploration and drainage, and coal seam floor grouting reinforcement construction, which solves the problems of many invalid footage and low construction efficiency caused by conventional rotary drilling . The downhole directional drilling technology uses a screw motor with a bent joint, and is equipped with a measurement-while-drilli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/04E21B21/12E21B17/04
CPCE21B7/04E21B21/12E21B17/04
Inventor 高晓亮王传留张朋邵国杰居培董昌乐陈洪岩伍涛
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP