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Low pressure gas-liquid driven reamer
Release time:
2021-05-11
Author:
Source:
In recent years, a variety of technologies have been developed and applied in coal seam permeability increasing mining technology, and many schemes have been discussed and used in many areas for coal seam gas extraction technology in bottom drainage tunnel. At present, the most widely used hole bottom hole drilling technology is an effective solution to increase the concentration of gas extraction. Using high-pressure water to punch holes can quickly and effectively achieve the purpose of hole bottom hole making, the water jet is used to break and cut the coal seam in the relative position, which increases the local space and thus improves the gas extraction rate. However, in case of soft coal seam with excessive gas content and loose coal quality, the coal powder is washed with high-pressure water, which is easy to cause the foaming flow of coal powder.
In recent years, a variety of technologies have been developed and applied in coal seam permeability increasing mining technology, and many schemes have been discussed and used in many areas for coal seam gas extraction technology in bottom drainage tunnel. At present, the most widely used hole bottom hole drilling technology is an effective solution to increase the concentration of gas extraction. Using high-pressure water to punch holes can quickly and effectively achieve the purpose of hole bottom hole making, the water jet is used to break and cut the coal seam in the relative position, which increases the local space and improves the gas extraction rate. However, in case of soft coal seam with excessive gas content and loose coal quality, the coal powder is washed with high-pressure water, which is easy to cause the foaming loss of coal powder and the accumulation of coal cinder seriously causes pressure drilling.
1. system composition
This system consistsCrawler type full hydraulic tunnel drilling rig for coal mineZDY4200L, double-wall gas-liquid channel drill pipe Φ73mm * 1m, low pressure gas-liquid drive reamer Φ400-500mm, double-channel gas-liquid water tail, diamond PDC bit Φ113mm, special gas-liquid control box, etc.
2. technical indicators
|
Line Number |
Project |
Design index |
Remarks |
|
1 |
Opening diameter |
Φ113mm |
Diamond PDC Bits |
|
2 |
Drilling depth |
10-200m |
|
|
3 |
Drive mode |
Gas-liquid drive |
|
|
4 |
Driving pressure |
≥ 0.65Mpa |
|
|
5 |
Knife body size |
Φ89*710 |
|
|
6 |
Size of gas-liquid driver |
Φ89*590 |
|
|
7 |
Reaming diameter |
Φ300-500mm |
Coal and rock automatic blade |
|
8 |
Type of drill pipe |
Double-wall gas-liquid channel drill pipe |
Automatic or manual loading and unloading |
|
9 |
Diameter of drill pipe |
Φ73/Φ89 |
|
|
10 |
Length of drill pipe |
1000mm/1500mm |
|
|
11 |
Geological conditions |
Borehole in this coal seam |
f≤4 |
|
12 |
Drilling angle |
≮ 15 degrees |
|
|
13 |
Drill bit diameter |
Φ113/Φ133 |
|
3. Technical Scheme
Low pressure gas-liquid driven reamer, the so-called low pressure, that is, the use of not morePressure air of 0.63Mpa or liquid less than 5Mpa is used as power output to realize mechanical hole reaming at the bottom of the hole, and low-pressure gas liquid is used to provide power to drive the multi-stage double force device arranged at the bottom of the reamer to push.
The multi-stage force-doubling device is a multi-fold incremental propulsion structure, provided with a greaterThe 1-stage propulsion piston relies on the multi-stage synchronous movement of the propulsion piston to achieve the purpose of thrust multiplication.
The bottom of the multi-stage force doubling device is provided with a gas-liquid inlet. When low-pressure compressed air or liquid flows through the multi-stage force doubling device, it generates driving thrust for the first-stage propulsion piston. At the same time, it flows through the second-stage propulsion piston and other multi-stage propulsion pistons. The piston rod extending from the thrust piston is pushed out to connect with the knife body piston to advance the knife body piston to control the opening and closing of the knife wing, the alloy for coal body cutting is evenly arranged on the periphery of both sides of the blade.
The end face of the piston shaft is connected with the built-in piston rod of the multi-stage force doubling device and provides axial thrust. When the thrust reaches a certain value, the piston shaft is pushed to perform axial movement to drive the opening and closing movement of the blade.
4. Implementation Scheme
The front end of the low-pressure gas-liquid drive reamer is connected with the drill bit, and the rear end is connected with the drill bit.double-wall gas-liquid channelThe drill pipe is connected,The double-wall gas-liquid channel drill pipe is connected with the double-channel gas-liquid tail,The drill is clamped and rotated by the drill. When drilling, the pressure air or cooling water from the outside enters the drill pipe ring cavity through the quick joint at the side end of the double-channel gas-liquid tail to cool the front bit. At this time, the reamer is in a closed state.
When drilling to a certain position to carry out reaming operation,Two-channel gas-liquid tail rear end connectionThe low-pressure air or liquid pushes the multi-stage double force device to move through the low-pressure air or liquid provided inside the reamer as power to drive the piston shaft inside the cutter body to move. The gear meshing on the blade pushes the blade to open, thereby cutting and crushing the coal body. After the operation is completed, the input source is cut off, and the reset device set inside is used to reverse push and reset.
(2) Technical operation essentials
The two-channel gas-liquid tail is equipped with a special regulating gas-liquid control device. When hole making is carried out, first determine whether the pressure indicated by the pressure gauge on the regulating gas-liquid control device reaches the applicable pressure, and then open the access control ball valve. At this time, the drilling rig should be in a rotating state, so that the blade is in a rotating force state when it is opened, so as not to cause sticking accident. Then start hole making in the hole making, open the pressure relief ball valve to release the pressure in the channel pipeline and close the blade in the hole.
5.-benefit comparison
|
Project |
Low pressure gas-liquid driven reamer system |
Hole-making system for high-pressure water conservancy |
|
Cave-making principle |
low pressure gas-liquid drive |
High pressure water conservancy punching |
|
Cavern diameter |
Φ300mm-Φ500mm |
Φ300mm-Φ450mm |
|
Cave-making depth |
Within 200 meters |
Within 100 meters |
|
Pressurized equipment |
None |
Additional high-pressure pumping station is required |
|
Cost budget |
about 900000 yuan |
about 1.5 million yuan (Including hydraulic crawler drilling rig, high-pressure pumping station and cavitation water jet) |
Key words:
