CN115680496A - Device and method for improving coal seam drilling and reaming efficiency - Google Patents
Device and method for improving coal seam drilling and reaming efficiency Download PDFInfo
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- CN115680496A CN115680496A CN202211439105.8A CN202211439105A CN115680496A CN 115680496 A CN115680496 A CN 115680496A CN 202211439105 A CN202211439105 A CN 202211439105A CN 115680496 A CN115680496 A CN 115680496A
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- ejector
- coal seam
- reaming
- pressure water
- drill
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- 239000003245 coal Substances 0.000 title claims abstract description 66
- 238000005553 drilling Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 68
- 239000003082 abrasive agent Substances 0.000 claims abstract description 14
- 238000007599 discharging Methods 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 230000006378 damage Effects 0.000 claims description 2
- 229940090046 jet injector Drugs 0.000 claims 2
- 238000010276 construction Methods 0.000 description 4
- 239000011435 rock Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention relates to a device and a method for improving the coal seam drilling and reaming efficiency. The method comprises the following steps: the drilling machine drives the drill rod and the drill bit to rotate so as to form a drill hole in the coal seam, an inner cavity and an outer cavity are formed in the drill rod, high-pressure water containing abrasive materials is communicated in the inner cavity, and high-pressure water without abrasive materials is communicated in the outer cavity. A hole enlargement adopts double jet ware simultaneous cutting mode for carrying out the reaming to the drilling that forms in the coal seam, carries out the precutting through low flow high pressure abrasive water to hard coal body, reaches the purpose of destroying coal body intensity in advance, simultaneously carries out quick reaming to the coal body through high flow high pressure non-abrasive water, can show improvement reaming efficiency, increase reaming radius, and abrasive water can carry out the secondary cutting to the bold coal body simultaneously, avoids the stifled hole problem of bold coal body.
Description
Technical Field
The invention relates to the technical field of coal mine safety mining, in particular to a method for improving the reaming efficiency of a large-diameter drilling hole of a coal seam.
Background
In a hard coal seam, the large-diameter drilling pressure relief space of the coal seam is small, the pressure relief effect is poor, the rock burst disaster cannot be effectively treated, and the lateral high-stress area of the roadway needs to be reamed by adopting water jet reaming or mechanical reaming and other modes. The water jet rotary reaming is the most economical reaming mode with highest efficiency and best safety. However, for a hard coal seam, because the strength of a coal body is high, the common water jet rotary cutting and reaming process has low reaming efficiency and small reaming radius, and the problem of hole plugging caused by a large coal body is easy to occur, so that the application of the technology in the hard coal seam is seriously influenced.
Disclosure of Invention
In view of the above problems, the present invention provides a method for improving the hole-enlarging efficiency of a large-diameter drilling hole in a coal seam. The method adopts a double-jet-flow device simultaneous cutting mode, pre-cuts the hard coal body through low-flow high-pressure abrasive water, achieves the purpose of damaging the strength of the coal body in advance, simultaneously performs rapid reaming on the coal body through high-flow high-pressure non-abrasive water, can remarkably improve reaming efficiency and increase reaming radius, and simultaneously enables abrasive water to perform secondary cutting on the large coal body, thereby avoiding the problem of hole blockage of the large coal body. The method can obviously improve the application effect of the coal seam hydraulic rotary cutting reaming technology, has important significance for controlling coal mine rock burst disasters, and has wide popularization and application prospects.
In order to achieve the purpose, the invention adopts the following technical scheme:
an apparatus for improving the efficiency of coal seam drilling and reaming, comprising: the drilling machine drives the drill rod and the drill bit to rotate so as to form a drill hole in the coal seam,
the drill rod is a double-layer sealed drill rod, an inner cavity and an outer cavity are formed in the drill rod, high-pressure water containing abrasive materials is introduced into the inner cavity, and high-pressure water without abrasive materials is introduced into the outer cavity;
set up first ejector and second ejector between drill bit and drilling rod, second ejector and inner chamber intercommunication will contain the water under high pressure of abrasive material blowout for carry out the destruction in advance to the coal seam, first ejector and outer chamber intercommunication will not contain the water under high pressure blowout of abrasive material, be arranged in carrying out the reaming to the drilling that forms in the coal seam.
The first ejector is closer to the drill bit than the second ejector.
The distance between the first ejector and the drill bit is less than 0.1m, and the distance between the first ejector and the second ejector is less than 0.1m.
The flow rate of the high-pressure water containing abrasives in the inner chamber is lower than the flow rate of the high-pressure water containing no abrasives in the outer chamber.
The high-pressure water containing the abrasive in the inner cavity is sprayed out through a second jet device nozzle arranged in a second jet device, and the high-pressure water without the abrasive in the outer cavity is sprayed out through a first jet device nozzle arranged in a first jet device.
The number of the first ejector nozzles is larger than that of the second ejector nozzles.
The diameter of the first ejector nozzle is larger than that of the second ejector nozzle.
2 second ejector nozzles are arranged in the second ejector, the diameter of each second ejector nozzle is 0.8-1.5 mm, 2-3 first ejector nozzles are arranged in the first ejector, and the diameter of each first ejector nozzle is 1.5-3.0 mm.
The flow rate of the high-pressure water containing the abrasive is 30-100L/min, the pressure is 20-50MPa, and the flow rate of the high-pressure water without the abrasive is 100-300L/min, and the pressure is 20-50MPa.
A method for improving the efficiency of coal seam drilling and reaming is provided, which uses a device for improving the efficiency of coal seam drilling and reaming and comprises the following steps:
installing a first ejector and a second ejector between a drill bit and a drill rod, and enabling the drill rod and the drill bit to be driven by a drilling machine to rotate so as to form a drill hole in a coal seam, wherein no water is supplied into an inner cavity of the drill rod during drilling, and low-pressure water is supplied into an outer cavity of the drill rod and is used for discharging slag during drilling;
after the drill hole is drilled to a preset depth, the drill rod is kept in a rotating state and retreats, high-pressure water containing abrasive is supplied into an inner cavity of the drill rod, high-pressure water without abrasive is supplied into an outer cavity of the drill rod, the high-pressure water containing abrasive is sprayed out of the second jet device and used for pre-damaging the coal seam, and the high-pressure water without abrasive is sprayed out of the first jet device and used for reaming the drill hole formed in the coal seam.
Due to the adoption of the technical scheme, the invention has the following advantages:
adopt the dual jet ware mode of cutting simultaneously, carry out the precutting to hard coal body through low flow high pressure abrasive water, reach the purpose that destroys coal body intensity in advance, simultaneously carry out quick reaming to the coal body through high flow high pressure non-abrasive water, can show and improve reaming efficiency, increase reaming radius, abrasive water energy carries out the secondary cutting to the bold coal body simultaneously, avoids the stifled hole problem of bold coal body. The method is popularized and applied in the field of rock burst disaster prevention and control, and has a wide prospect.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Like parts are designated with like reference numerals throughout the drawings. In the drawings:
FIG. 1 is a schematic illustration of a construction process according to an embodiment of the present application.
The reference symbols in the drawings denote the following:
1. a drill bit; 2. a first ejector; 3. a second ejector; 4. a first ejector nozzle; 5. a second ejector nozzle; 6. an outer chamber; 7. drilling a rod; 8. an inner cavity; 9. a drilling machine; 10. a water connector is arranged in the inner cavity; 11. an outer cavity water joint; 12. water whip; 20. a coal seam; 21. drilling; A. the direction of rotation of the drill rod; l1, pre-cutting sections; l2, a dilated segment.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
According to some embodiments of the present application, there is provided a method of improving the efficiency of reaming a large diameter borehole in a coal seam, comprising:
step one, a frosted ejector and a common ejector are installed between a drill bit and a double-layer sealing drill rod, a water whip matched with the double-layer drill rod is connected with a drilling machine to construct a coal seam large-diameter drilling hole, during the construction of the large-diameter drilling hole, water is not supplied to an inner cavity of the double-layer sealing drill rod, and low-pressure water is introduced into an outer cavity of the double-layer sealing drill rod and is used for discharging slag during the drilling process of the drilling hole.
And step two, after the large-diameter drilling of the coal seam is constructed to the designed depth, the rotation state of the drill rod is kept, the drill rod is slowly retreated, at the moment, the inner cavity is communicated with low-flow high-pressure water containing the grinding materials, and the outer cavity is communicated with high-flow high-pressure water without the grinding materials. High-pressure water containing abrasive is ejected from the sanding ejector at high speed and is used for pre-damaging hard coal; and high-pressure water without abrasive is sprayed out from the common jet device at a high speed and is used for reaming the coal seam drilling.
And step three, after the step two is continued until the reaming end position is designed, the drill rod is drawn out, and the construction is finished.
The common jet device is positioned behind the drill bit, and the distance between the common jet device and the drill bit is less than 0.1m.
The frosted jet device is positioned behind the common jet device, and the distance between the frosted jet device and the common jet device is less than 0.1m.
2 nozzles are arranged in the frosted jet device, and the diameter of each nozzle is 0.8mm-1.5mm.
2-3 nozzles are arranged in the common jet device, and the diameter of each nozzle is 1.5mm-3.0mm.
The low-flow high-pressure water containing the abrasive has the flow of 30-100L/min and the pressure of 20-50MPa.
High-flow high-pressure water without abrasive, the flow is 100-300L/min, and the pressure is 20-50MPa.
The embodiment is as follows:
the method comprises the following steps: and (4) constructing a coal seam drilling hole in the coal seam, and stopping drilling after the drilling hole is drilled to the designed depth.
Step two: opening the outer high pressure water pump in hole, inner chamber and the exocoel high pressure water in the sealed drilling rod of double-deck simultaneously through the inner chamber water service connector in the high pressure water whip and exocoel water service connector are high pressure water, and wherein the inner chamber supplies low flow high pressure abrasive water, and exocoel high flow high pressure non-abrasive water, and the drilling rod is slowly moved back while controlling the rig to rotate.
Step three: the inner cavity is connected with an abrasive jet device, two nozzles with the diameter of 0.8mm-1.5mm are arranged in the abrasive jet device, high-pressure abrasive water is sprayed out from the two nozzles at a high speed to form a spiral crack in the hole wall, so that a hard coal body between the abrasive jet device nozzle and a common jet device nozzle is damaged in advance to form a pre-cutting section, and the strength of the coal body is greatly reduced.
Step four: and step three, connecting the outer cavity with a common jet device, wherein the common jet device is provided with 2-3 nozzles with the diameter of 1.5mm-3.0mm, and high-flow high-pressure non-abrasive water is sprayed out from the nozzles at high speed so as to ream the pre-damaged coal seam.
Step five: and continuing the third step and the fourth step to continuously increase the length of the reamed segment until the reaming stopping position is designed, and finishing the whole construction.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides an improve device of coal seam drilling reaming efficiency which characterized in that includes: a drill rig, a drill rod and a drill, the drill rig driving the drill rod and the drill bit to rotate to form a borehole in the coal seam,
the drill rod is a double-layer sealed drill rod, an inner cavity and an outer cavity are formed in the drill rod, high-pressure water containing abrasive materials is introduced into the inner cavity, and high-pressure water without abrasive materials is introduced into the outer cavity;
and a first ejector and a second ejector are arranged between the drill bit and the drill rod, the second ejector is communicated with the inner cavity and is used for ejecting high-pressure water containing abrasive to pre-damage the coal seam, and the first ejector is communicated with the outer cavity and is used for ejecting high-pressure water containing no abrasive to ream the drilled hole formed in the coal seam.
2. The apparatus for improving the efficiency of reaming a borehole in a coal seam of claim 1, wherein the first jet is closer to the drill bit than the second jet.
3. The device for improving the reaming efficiency of coal seams for drilling holes according to claim 1, wherein the distance between the first jet device and the drill bit is less than 0.1m, and the distance between the first jet device and the second jet device is less than 0.1m.
4. The apparatus of claim 1, wherein the flow rate of the high pressure water containing the abrasives in the inner chamber is lower than the flow rate of the high pressure water without abrasives in the outer chamber.
5. The apparatus for improving the efficiency of coal seam drilling and reaming according to claim 1, wherein the high pressure water containing abrasives in the inner chamber is ejected through a second ejector nozzle disposed in a second ejector and the high pressure water containing no abrasives in the outer chamber is ejected through a first ejector nozzle disposed in a first ejector.
6. The apparatus for improving coal seam drilling and reaming efficiency according to claim 5, wherein the number of first jet nozzles is greater than the number of second jet nozzles.
7. The apparatus for improving coal seam drilling reaming efficiency according to claim 5, wherein a diameter of the first jet injector nozzle is larger than a diameter of the second jet injector nozzle.
8. The device for improving coal seam drilling and reaming efficiency according to claim 5, wherein 2 second ejector nozzles are arranged in the second ejector, the diameter of each second ejector nozzle is 0.8mm-1.5mm, 2-3 first ejector nozzles are arranged in the first ejector, and the diameter of each first ejector nozzle is 1.5mm-3.0mm.
9. The device for improving the reaming efficiency of the coal seam drilling hole according to claim 1, wherein the flow rate of the high-pressure water containing the abrasive is 30-100L/min, the pressure is 20-50MPa, and the flow rate of the high-pressure water without the abrasive is 100-300L/min, and the pressure is 20-50MPa.
10. A method for improving the efficiency of coal seam borehole reaming, using the apparatus of any one of claims 1-9, comprising:
the first ejector and the second ejector are arranged between the drill bit and the drill rod, so that the drill rod and the drill bit are driven by the drilling machine to rotate to form a drill hole in the coal seam, water is not supplied to an inner cavity of the drill rod during drilling, and low-pressure water is supplied to an outer cavity of the drill rod and is used for discharging slag during drilling;
after the drill hole is drilled to a preset depth, the drill rod is kept in a rotating state and retreats, high-pressure water containing abrasive is supplied into an inner cavity of the drill rod, high-pressure water without abrasive is supplied into an outer cavity of the drill rod, the high-pressure water containing abrasive is sprayed out of the second jet device and used for pre-damaging the coal seam, and the high-pressure water without abrasive is sprayed out of the first jet device and used for reaming the drill hole formed in the coal seam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211439105.8A CN115680496A (en) | 2022-11-17 | 2022-11-17 | Device and method for improving coal seam drilling and reaming efficiency |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211439105.8A CN115680496A (en) | 2022-11-17 | 2022-11-17 | Device and method for improving coal seam drilling and reaming efficiency |
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| Publication Number | Publication Date |
|---|---|
| CN115680496A true CN115680496A (en) | 2023-02-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211439105.8A Pending CN115680496A (en) | 2022-11-17 | 2022-11-17 | Device and method for improving coal seam drilling and reaming efficiency |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117307156A (en) * | 2023-11-28 | 2023-12-29 | 中煤科工开采研究院有限公司 | Dual high pressure jet and method of use |
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- 2022-11-17 CN CN202211439105.8A patent/CN115680496A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117307156A (en) * | 2023-11-28 | 2023-12-29 | 中煤科工开采研究院有限公司 | Dual high pressure jet and method of use |
| CN117307156B (en) * | 2023-11-28 | 2024-04-09 | 中煤科工开采研究院有限公司 | Dual high pressure jet and method of use |
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