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Anti-backflow directional drill bit with reverse flushing function and its construction method

A directional drill bit and reverse flushing technology, used in directional drilling, flushing wellbore, drill pipe, etc., can solve the problems of directional drilling tools difficult to raise the bottom of the hole, screw motor damage, etc., to improve the accident handling ability, easy processing, Easy loading and unloading effect

Active Publication Date: 2022-06-24
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 reverse flushing function and its construction method
  • Anti-backflow directional drill bit with reverse flushing function and its construction method
  • Anti-backflow directional drill bit with reverse flushing function and its construction method

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Embodiment 1

[0041] This embodiment provides a backflow prevention directional drill bit with a backflushing 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 a connecting end and a limiting end. The inner wall of the cylindrical body 201 from the connecting end to the limiting end is a first inner wall 203, a first The 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 a plurality of oblique through holes 208. There are through ho...

Embodiment 2

[0055] The present embodiment provides a construction method for a backflow prevention directional drill bit with a reverse flushing function. The construction method is implemented by the directional drill bit in 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 turn, put it into the bottom of the hole through the drilling rig, and apply the drilling pressure to perform 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, and the drill bit can be cooled to carry rock powder;

[0057] Step 2: After completing one round of directional drilling, lift the drilling tool away from the bottom of the hole. At this time, under the action of the spring, the upper co...

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Abstract

The invention discloses an anti-backflow directional drill bit with reverse flushing function and a construction method thereof. The directional drill bit includes a drill bit, a lower connecting member connected with the drill bit, and an upper connecting member connected with the lower connecting member and capable of moving axially; When the ball threaded pin is stuck in the positioning long groove and the upper connecting member cannot move up, the lateral fluid through hole is located in the annular space of the second inner wall and can communicate with the oblique through hole, which can be carried out through the nozzle installed in the oblique through hole. Relieve the pressure and continue to flush the borehole in the reverse direction, and at the same time, the flushing channel of the drill bit is closed to prevent the flushing medium from carrying the rock powder back; when the upper connecting member is pressed down, the spring is compressed, and the lateral fluid through hole can extend to the annulus opposite the first inner wall Ensure the supply of the drill bit flushing medium by communicating with the drill bit water hole on the drill bit. The invention can be used to prevent the drilling slag carried by the flushing medium from flowing back to the power drilling tool at the bottom of the hole from being damaged, and it can also be used for accident treatment construction after drill sticking in directional drilling in strata prone to collapse.

Description

technical field [0001] The invention belongs to the technical field of directional drilling, and relates to a back-flushing type directional drill bit with a reverse flushing function and a construction method thereof, which are used to prevent the power drilling tool from being damaged due to the back-flow of drilling slag carried by the flushing medium to the bottom of the hole. Accident handling and construction after directional drilling in strata that are prone to collapsing holes. Background technique [0002] With the development of directional drilling technology, underground directional drilling technology in coal mines is widely used in gas drainage, water exploration and drainage, and grouting reinforcement of coal seam floor, which solves the problem of ineffective footage and low construction efficiency caused by conventional rotary drilling . The downhole directional drilling technology utilizes a screw motor with an elbow joint, and is equipped with a measure...

Claims

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Application Information

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Patent Type & Authority Patents(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