CN113323591A - Ultrahigh pressure fluid pressure conversion device - Google Patents
Ultrahigh pressure fluid pressure conversion device Download PDFInfo
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- CN113323591A CN113323591A CN202110584382.7A CN202110584382A CN113323591A CN 113323591 A CN113323591 A CN 113323591A CN 202110584382 A CN202110584382 A CN 202110584382A CN 113323591 A CN113323591 A CN 113323591A
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- 239000012530 fluid Substances 0.000 title claims abstract description 123
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 114
- 238000007789 sealing Methods 0.000 claims abstract description 88
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 82
- 239000003245 coal Substances 0.000 claims description 35
- 230000006835 compression Effects 0.000 claims description 18
- 238000007906 compression Methods 0.000 claims description 18
- 239000011435 rock Substances 0.000 claims description 16
- 239000007788 liquid Substances 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 claims 1
- 238000005553 drilling Methods 0.000 abstract description 35
- 230000002093 peripheral effect Effects 0.000 description 7
- 230000001105 regulatory effect Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000035699 permeability Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 239000012634 fragment Substances 0.000 description 3
- 238000005065 mining Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000008859 change Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/18—Drilling by liquid or gas jets, with or without entrained pellets
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B12/00—Accessories for drilling tools
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/02—Drilling rigs characterized by means for land transport with their own drive, e.g. skid mounting or wheel mounting
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C25/00—Cutting machines, i.e. for making slits approximately parallel or perpendicular to the seam
- E21C25/60—Slitting by jets of water or other liquid
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
The invention discloses an ultrahigh pressure fluid pressure conversion device, which comprises an ultrahigh pressure fluid pressure conversion device body and an ultrahigh pressure fluid pressure conversion valve body, wherein a first sealing section is arranged at the front end of the ultrahigh pressure fluid pressure conversion device body, a second sealing section is arranged at the tail end of the ultrahigh pressure fluid pressure conversion device body, a stepped through hole is formed in the front end of the second sealing section in the ultrahigh pressure fluid pressure conversion device body, the ultrahigh pressure fluid pressure conversion valve body is arranged in the stepped through hole, and the ultrahigh pressure fluid pressure conversion valve body is used for adjusting the threshold value of a water flow passage of the ultrahigh pressure fluid pressure conversion device. The ultrahigh pressure fluid pressure conversion device can adjust a reasonable pressure conversion threshold value during low-pressure drilling by rotating the pressure adjusting screw according to the pressure of working fluid for the drilling equipment, and realizes ultrahigh pressure slot cutting during conventional low-pressure drilling and drill withdrawal of the drilling equipment.
Description
Technical Field
The invention relates to the technical field of high-pressure water jet cutting devices, in particular to an ultrahigh-pressure fluid pressure conversion device.
Background
With the continuous application of new technologies and equipment for coal mining, the mining depth is continuously deepened to the deep part at a speed of about 10-20 m every year, and deep coal rock gas dynamic disasters gradually become main problems which restrict the safe and efficient production of coal mines. The coal rock gas dynamic disaster treatment of the deep mine needs disaster prevention and control from the angle of standard reaching and effective pressure relief of coal bed gas extraction, hydraulic pressure relief and permeability increase measures for the coal bed have the effect of achieving the effect of half the effort, under the condition of high stress at the deep part, water jet pressure needs to be greatly improved when medium and hard coal is expanded, pressure relief and permeability increase, the coal breaking efficiency and the coal breaking depth are further improved, and the problem of coal rock dynamic disaster treatment of the deep mine is solved. The hydraulic reaming, hydraulic slotting, drilling and cutting are integrated and widely used as pressure relief and permeability improvement measures, the working pressure of the existing hydraulic slotting and hydraulic reaming device is 30-50 MPa, and the existing hydraulic slotting and hydraulic reaming device is difficult to effectively cut coal rocks with large hardness; the 100MPa ultrahigh pressure water jet slotting device is also put into use, but the high-low pressure conversion threshold value of the existing ultrahigh pressure water jet slotting device is fixed and cannot be adjusted, the width of a slot is narrow, and the pressure relief and permeability increase effects are not obvious.
Disclosure of Invention
In order to solve the above technical problems, an object of the present invention is to provide an ultrahigh pressure fluid pressure conversion device. The ultrahigh pressure fluid pressure conversion device can adjust a reasonable pressure conversion threshold value during low-pressure drilling by rotating the pressure adjusting screw according to the pressure of working fluid for the drilling equipment, and realizes ultrahigh pressure slot cutting during conventional low-pressure drilling and drill withdrawal of the drilling equipment.
The above object of the present invention is achieved by the following technical solutions: the utility model provides an ultrahigh pressure fluid pressure conversion equipment, the device include ultrahigh pressure fluid pressure conversion equipment body and ultrahigh pressure fluid pressure conversion valve body the front end of ultrahigh pressure fluid pressure conversion equipment body is equipped with first sealed section, and the tail end is equipped with the sealed section of second the sealed section front end of this internal second of ultrahigh pressure fluid pressure conversion equipment is equipped with the ladder through-hole, ultrahigh pressure fluid pressure conversion valve body is installed in the ladder through-hole, realizes adjusting the threshold value that seals ultrahigh pressure fluid pressure conversion equipment water flow path through ultrahigh pressure fluid pressure conversion valve body.
Furthermore, a plurality of water jet nozzles are symmetrically installed on the ultrahigh pressure fluid pressure conversion device body along the circumferential direction in a staggered manner.
Furthermore, the plurality of water jet nozzles are positioned between the second sealing section and the ultrahigh pressure fluid pressure conversion valve body, and the dislocation distance L between two adjacent water jet nozzles is 2 cm-6 cm.
Further, the water jet nozzles are direct flow nozzles, and the number of the water jet nozzles is 2-3; the included angle between each water jet nozzle and the side wall of the ultrahigh pressure fluid pressure conversion device body is 90 degrees.
Furthermore, the front end of each water jet nozzle on the ultrahigh pressure fluid pressure conversion device body is respectively provided with a coal rock crushing piece protruding outwards.
Further, first seal section includes first straight shaft guide section, first O type circle, first right angle sliding ring and first interior sealed taper screw thread be equipped with the annular on the first straight shaft guide section, install first O type circle and first right angle sliding ring in the annular the rear end of first straight shaft guide section is equipped with first interior sealed taper screw thread.
Further, a first chamfer angle is arranged at the top of the first straight shaft guide section, and the angle of the first chamfer angle is 30-60 degrees.
Further, the second sealing section comprises a first outer cone sealing taper thread and a first inner cylindrical hole section which are arranged on the inner circumferential surface of the ultrahigh pressure fluid pressure conversion device body and are sequentially arranged from the tail end to the front end.
The ultrahigh pressure fluid pressure conversion valve body comprises a compression spring, a valve rod, a positioning valve core, a pressure adjusting screw rod and a check ring which are sequentially arranged from front to back, the compression spring is sleeved outside the valve rod, the positioning valve core is sleeved outside the pressure adjusting screw rod, the positioning valve core and the inner peripheral surface of the ultrahigh pressure fluid pressure conversion device body can be axially movably arranged through a key groove, the front end of the pressure adjusting screw rod is embedded into the valve rod and is connected in a threaded mode, the check ring is positioned at the rear end of the pressure adjusting screw rod and is arranged in a groove formed in the inner peripheral surface of the ultrahigh pressure fluid pressure conversion device body, a first conical surface is arranged at the diameter-changing position of the stepped through hole, and a second conical surface matched with the first conical surface is arranged at the front end of the valve rod; the distance between the front end of the valve rod and the first conical surface of the stepped through hole is adjusted by rotating the pressure adjusting screw rod, the deformation of the compression spring is changed, and then the threshold value of the water flow passage of the ultrahigh pressure fluid pressure conversion device is adjusted and closed; when the pressure of the working liquid is greater than a threshold value, the second conical surface is contacted with the first conical surface, and a water flow passage in the ultrahigh pressure fluid pressure conversion device is closed; when the pressure of the working liquid is smaller than the threshold value, the second conical surface is separated from the first conical surface, and a water flow passage in the ultrahigh pressure fluid pressure conversion device is opened.
Furthermore, the front end of the compression spring is abutted against the stepped surface of the stepped through hole of the ultrahigh pressure fluid pressure conversion device body, and the rear end of the compression spring is abutted against the front end surface of the positioning valve core.
Compared with the prior art, the invention has the beneficial effects that: the ultrahigh pressure fluid pressure conversion device can adjust a reasonable pressure conversion threshold value during low-pressure drilling by rotating the pressure adjusting screw according to the pressure of working fluid for the drilling equipment, and realizes ultrahigh pressure slot cutting during conventional low-pressure drilling and drill withdrawal of the drilling equipment. Through the dislocation installation of water jet nozzle, form multichannel slotted groove in the coal petrography through the rotation in the superhigh pressure slotting process, multichannel slotted groove synthesizes into a water conservancy slotted groove that has certain width and degree of depth under gas pressure and ground stress effect, increases original slotted groove width 2 ~ 3 times, the effectual coal body area that exposes that has increased the coal body, increases the inside crack of coal body for the coal body fully relieves the pressure and increases the permeability. Meanwhile, the coal rock crushing pieces are arranged at the front parts of the water jet nozzles, so that the water jet nozzles are protected from being damaged by coal rock walls and crushed coal rock bodies during drilling, the coal rock crushing pieces can effectively crush large coal rock blocks formed by ultrahigh-pressure hydraulic cutting seams during ultrahigh-pressure hydraulic cutting seams, and the hole blocking risk during the hydraulic cutting seams is effectively reduced.
Drawings
The invention is further described with reference to the following figures and detailed description.
FIG. 1 is a schematic view of the structure of an ultrahigh-pressure fluid pressure conversion apparatus according to the present invention;
FIG. 2 is a schematic structural diagram of an adjustable ultrahigh-pressure water jet cutting device;
FIG. 3 is a schematic structural view of an ultrahigh pressure sealing drill rod with a circular through hole in the drill rod body;
FIG. 4 is a schematic structural view of an ultrahigh pressure sealing drill rod with a stepped hole in the drill rod body;
FIG. 5 is a schematic view of a spiral groove structure on an ultrahigh pressure sealing drill rod with a circular through hole in the drill rod body;
FIG. 6 is a schematic structural view of a helical blade on an ultrahigh pressure sealing drill rod with a stepped hole in the drill rod body;
in the figure: 2. an ultrahigh pressure fluid pressure conversion device; 21. an ultrahigh pressure fluid pressure conversion device body; 211. a first seal section; 2111. a first straight shaft guide section; 2112. a first internally tapered sealing cone thread; 2113. a first O-ring; 2114. a first right angle slip ring; 212. a second seal section; 2121. a first outer cone sealing cone thread; 2122. a first inner cylindrical bore section; 213. a stepped through hole; 214. a first conical surface; 22. an ultrahigh pressure fluid pressure switching valve body; 221. a compression spring; 222. a valve stem; 2221. a second tapered surface; 223. positioning the valve core; 224. a pressure adjusting screw; 225. a retainer ring; 23. a water jet nozzle; 24. breaking coal rock fragments; 25. a first chamfer;
1. a drill bit; 3. sealing the drill rod at ultrahigh pressure; 31. a drill rod body; 311. a first axial seal structure; 3111. a second straight-axis guide section; 3112. a second O-ring; 3113. a second right angle slip ring; 3114. a second internally tapered sealing cone thread; 312. a second axial seal structure; 3121. a second outer cone sealing cone thread; 3122. a second inner cylindrical bore section; 313. a circular through hole; 314. a spiral groove; 315. a stepped hole; 316. a helical blade; 32. a second chamfer; 4. a drilling machine; 5. rotating the water tail at ultrahigh pressure; 6. an ultra-high pressure hose; 7. a pressure relief regulating valve; 8. an ultrahigh pressure hydraulic pump station; 9. hydraulic slot sewing; 10. coal seam circular slot; 11. and (5) assisting the rock breaking nozzle.
Detailed Description
Example one
The details and embodiments of the present invention are further described with reference to the accompanying drawings and the following embodiments.
Referring to fig. 1, an ultrahigh pressure fluid pressure conversion device includes an ultrahigh pressure fluid pressure conversion device body 21 and an ultrahigh pressure fluid pressure conversion valve body 22, wherein a first sealing section 211 is disposed at a front end of the ultrahigh pressure fluid pressure conversion device body 21, a second sealing section 212 is disposed at a rear end of the ultrahigh pressure fluid pressure conversion device body 21, a stepped through hole 213 is disposed at a front end of the second sealing section 212 in the ultrahigh pressure fluid pressure conversion device body 21, and the ultrahigh pressure fluid pressure conversion valve body 22 is installed in the stepped through hole 213, so that a threshold value for closing a water flow passage of the ultrahigh pressure fluid pressure conversion device can be adjusted by the ultrahigh pressure fluid pressure conversion valve body.
A plurality of water jet nozzles 23 are symmetrically installed on the ultrahigh-pressure fluid pressure conversion device body 21 in a staggered manner in the circumferential direction.
The second sealing section 212 includes a first external cone sealing cone thread 2121 and a first internal cylindrical hole section 2122, which are disposed on the inner circumferential surface of the ultrahigh-pressure fluid pressure conversion device body 21 and are sequentially disposed from the tail end to the front end.
The plurality of water jet nozzles 23 are positioned between the second sealing section 212 and the ultrahigh pressure fluid pressure conversion valve body 22, and the dislocation distance L between two adjacent water jet nozzles 23 is 2 cm-6 cm.
The number of the water jet nozzles is 2-3; each water jet nozzle 23 forms an angle of 90 degrees with the side wall of the ultrahigh pressure fluid pressure conversion device body 21.
The broken piece 24 of coal petrography that outside is convex is installed respectively to every water jet nozzle 23's front end on superhigh pressure fluid pressure conversion equipment body 21, broken piece 24 of coal petrography is made for diamond compact piece or carbide, can effectively break the big coal petrography piece that superhigh pressure water conservancy slot formed through setting up broken piece 24 of coal petrography, reduces the stifled hole risk of water conservancy slot in-process effectively.
The ultrahigh pressure fluid pressure conversion valve body 22 comprises a compression spring 221, a valve rod 222, a positioning valve core 223, a pressure adjusting screw 224 and a retainer ring 225 which are sequentially arranged from front to back, the compression spring 221 is sleeved outside the valve rod 222, the positioning valve core 223 is sleeved outside the pressure adjusting screw 224, the positioning valve core 223 and the inner circumferential surface of the ultrahigh pressure fluid pressure conversion device body 21 can be axially movably installed through a key groove, the front end of the pressure adjusting screw 224 is embedded into the valve rod 222 and connected in a threaded manner, the retainer ring 225 is positioned at the rear end of the pressure adjusting screw 224 and is arranged in a groove formed in the inner circumferential surface of the ultrahigh pressure fluid pressure conversion device body 21, a first conical surface 214 is arranged at the reducing part of the stepped through hole 213, and a second conical surface 2221 matched with the first conical surface 214 is arranged at the front end of the valve rod 222; the distance between the front end of the positioning valve core 223 and the first conical surface 214 of the stepped through hole 213 is adjusted by rotating the pressure adjusting screw 224, the deformation of the compression spring 221 is changed, and the threshold value of the water flow passage of the ultrahigh pressure fluid pressure conversion device is adjusted; when the pressure of the working fluid is greater than the threshold value, the second taper surface 2221 is in contact with the first taper surface 214, the water flow passage in the ultrahigh-pressure fluid pressure conversion device is closed, and when the pressure of the working fluid is less than the threshold value, the second taper surface 2221 is separated from the first taper surface 214, and the water flow passage in the ultrahigh-pressure fluid pressure conversion device is opened; the invention can adjust the compression amount of the compression spring 221 by rotating the pressure adjusting screw 224, thereby adjusting the pressure conversion threshold;
the front end of the compression spring 221 abuts against the stepped surface of the stepped through hole 213 of the ultrahigh-pressure fluid pressure conversion device body 21, and the rear end abuts against the front end surface of the positioning spool 223.
The top of the first straight shaft guide section 2111 is provided with a first chamfer 25, and the angle of the first chamfer 25 is 30-60 degrees.
A gap is formed between the outer peripheral surface of the valve stem 222 and the inner peripheral surface of the larger diameter through hole of the stepped through hole 213 of the ultrahigh-pressure fluid pressure conversion device body 21, and the gap is 2mm to 5 mm.
The working principle of the invention is as follows: a reasonable pressure conversion threshold value is determined according to the pressure of the working fluid supplied to the drilling equipment, the distance between the front end of the valve rod 222 and the first conical surface 214 of the stepped through hole 213 is adjusted by rotating the pressure adjusting screw 224, the deformation amount of the compression spring 221 is changed, and then the threshold value for closing the water flow passage of the ultrahigh pressure fluid pressure conversion device is adjusted. When the pressure of the working fluid supplied to the drilling equipment is greater than the threshold value, the second conical surface 2221 is in contact with the first conical surface 214, a water flow passage in the ultrahigh pressure fluid pressure conversion device is closed, the working fluid is sprayed out through a water jet nozzle, and then the pipeline pressure is further increased to the ultrahigh pressure state to realize ultrahigh pressure slotting; when the pressure of the working fluid supplied to the drilling equipment is less than the threshold value, the second tapered surface 2221 is separated from the first tapered surface 214, the water flow passage in the ultrahigh pressure fluid pressure conversion device is opened, the working fluid normally passes through, and the drilling equipment performs conventional low-pressure drilling.
Example two
The ultrahigh pressure fluid pressure conversion device is applied to an adjustable ultrahigh pressure water jet cutting device, and the specific structure of the adjustable ultrahigh pressure water jet cutting device is as follows:
referring to fig. 2, the adjustable ultrahigh pressure water jet cutting device comprises a drill bit 1, an ultrahigh pressure fluid pressure conversion device 2, an ultrahigh pressure sealing drill rod 3, an ultrahigh pressure rotating water tail 5, a plurality of ultrahigh pressure hoses 6 and an ultrahigh pressure hydraulic power pump station 8 which are sequentially connected from front to back; a drilling machine 4 is arranged below the ultrahigh pressure sealing drill rod 3 and is driven by a slewing gear on the drilling machine 4 to rotate and feed, a pressure relief regulating valve is arranged among the ultrahigh pressure hoses, and the ultrahigh pressure fluid pressure conversion device 2 and the ultrahigh pressure sealing drill rod 3 as well as the ultrahigh pressure sealing drill rod 3 and the ultrahigh pressure rotating water tail 5 are connected by ultrahigh pressure axial sealing structures; the ultrahigh pressure hose 6 is connected to the tail part of the ultrahigh pressure sealing drill rod 3 through the ultrahigh pressure rotating water tail 5, the ultrahigh pressure water pump station 8 supplies water to the ultrahigh pressure fluid pressure conversion device 2 and the drill bit 1 through the ultrahigh pressure hose 6 and the ultrahigh pressure sealing drill rod 3, and the pressure relief regulating valve 7 is used for regulating the pipeline pressure and further controlling the closing and opening of a water flow passage in the ultrahigh pressure fluid pressure conversion device, so that the low-pressure drilling and ultrahigh pressure slotting of the adjustable ultrahigh pressure water jet cutting device are realized.
When a plurality of ultrahigh pressure hoses 6 are connected, ultrahigh pressure pulse-resistant hose joints are adopted for connection among the ultrahigh pressure hoses 6.
The ultrahigh-pressure rotating water tail 5 is fully sealed by hard alloy, and the flow coefficient is larger than 3.0.
The ultrahigh-pressure hydraulic pump station is a horizontal five-plunger reciprocating pump, the rated pressure is greater than 100MPa, and the rated flow is greater than 6m3/h。
EXAMPLE III
Referring to fig. 2, the use method of the adjustable ultrahigh-pressure water jet cutting device specifically comprises the following implementation steps:
(1) the ultrahigh pressure sealing drill rod 3 is arranged on a drilling machine 4 and is driven by a slewing gear on the drilling machine to rotate and feed, and the ultrahigh pressure fluid pressure conversion device 2 is arranged at the front end of the ultrahigh pressure sealing drill rod 3; the front end of the ultrahigh pressure fluid pressure conversion device 2 is provided with a drill bit 1; the ultrahigh pressure hose 6 is connected behind the ultrahigh pressure sealing drill rod 3 through the ultrahigh pressure rotating water tail 5; the pressure relief regulating valve 7 is arranged among the plurality of ultrahigh pressure hoses 6, and the ultrahigh pressure hydraulic pump station 8 supplies water into the ultrahigh pressure sealing drill rod 3, the ultrahigh pressure fluid pressure changing device 2 and the drill bit 1 through the ultrahigh pressure hoses 6 and the ultrahigh pressure rotary water tail 5;
(2) determining a reasonable pressure conversion threshold value according to the pressure of the working fluid supplied to the drilling equipment, and changing the deformation amount of the compression spring 221 by rotating the pressure adjusting screw 224 so as to adjust the threshold value for closing the water flow passage of the ultrahigh pressure fluid pressure conversion device 2 and further change the maximum pressure P1 allowed to pass through the water outlet of the drill bit 1;
(3) the pressure of water conveyed by the ultrahigh pressure hose 6 is adjusted through the pressure relief regulating valve 7, so that the closing and opening of a water flow passage in the ultrahigh pressure fluid pressure conversion device are controlled, and the low-pressure drilling and ultrahigh pressure slotting of the adjustable ultrahigh pressure water jet cutting device are realized.
The step (3) is specifically as follows:
the pressure of water conveyed by the ultrahigh pressure hose 6 is adjusted through the pressure relief adjusting valve 7, when the pressure between the pressure relief adjusting valve 6 and the ultrahigh pressure rotating water tail 5 is smaller than P1, the second conical surface 2221 is separated from the first conical surface 214, and high-pressure water is sprayed out from the auxiliary rock breaking nozzle 11 at the front end of the high-pressure hydraulic auxiliary coal breaking drill bit 1 through the ultrahigh pressure fluid pressure conversion device 2 to drill the coal body at the front end of the cutting drill hole in an auxiliary manner; when the output pressure of the ultrahigh-pressure hydraulic pump station 8 is higher than P1, the position of the valve rod 222 in the ultrahigh-pressure fluid pressure conversion device 2 moves forwards, the second conical surface and the first conical surface 214 of the stepped through hole 213 of the ultrahigh-pressure fluid pressure conversion device body 21 are matched to form a seal, a water flow passage is closed, the pipeline pressure is improved, high-pressure water is sprayed out through the water jet nozzles 23 which are installed in a staggered mode, the coal seam is cut through to form hydraulic seam grooves 9 with a certain distance, ultrahigh-pressure cutting is achieved, and the plurality of hydraulic seam grooves 9 are mutually fused into a coal seam annular seam groove 10 with a considerable width and depth under the water jet disturbance of the ground stress, the gas pressure and the sound velocity level.
The ultrahigh-pressure slotting mode in the step (3) is a forward-type slotting mode and a backward-type slotting mode; the specific operation steps are that the drilling machine 4 executes the step (3) of ultrahigh-pressure slotting for 2 times at two ends of the stroke of a single ultrahigh-pressure sealing drill rod 3 in the process of advancing slotting or retreating slotting, and then repeats the step (3) after increasing or reducing more than 2 ultrahigh-pressure sealing drill rods 3 until the whole drilling hole finishes ultrahigh-pressure hydraulic slotting operation.
The drilling machine 4 is a crawler-type automatic drilling machine, the ultrahigh-pressure hydraulic power pump station 8 is a crawler-type, and both the drilling machine 4 and the ultrahigh-pressure hydraulic power pump station 8 can be remotely operated.
The structure of the ultrahigh pressure sealing drill rod 3 is shown in fig. 3 and 4, the drill rod comprises a drill rod body 31, a first axial sealing structure 311 is arranged on the outer peripheral surface of the front end of the drill rod body 31, a second axial sealing structure 312 is arranged on the inner peripheral surface of the rear end of the drill rod body 31, the first axial sealing structure 311 comprises a second straight shaft guiding section 3111, a second inner cone sealing cone thread 3114, a second O-ring 3112 and a second right-angle slip ring 3113, a rectangular groove is arranged on the second straight shaft guiding section 3111, the second O-ring 3112 and the second right-angle slip ring 3113 are arranged in the annular groove, and the second inner cone sealing cone thread 3114 is arranged at the rear end of the second straight shaft guiding section 3111; the second axial sealing structure 312 comprises a second outer cone sealing conical thread 3121 and a second inner cylindrical hole section 3122 which are sequentially arranged from back to front; the second straight shaft guide section 3111 and the second inner cylindrical bore section 3122 are concentric, and the inner diameter of the second inner cylindrical bore section 3122 is greater than the outer diameter of the second straight shaft guide section 3111; when a plurality of ultrahigh pressure sealing drill rods 3 are sequentially connected end to end, the first axial sealing structure 311 and the second axial sealing structure 312 of two adjacent ultrahigh pressure sealing drill rods 3 are matched, and the second O-shaped ring 3112 and the second right-angle slip ring 3113 are sequentially arranged in the rectangular groove to form combined sealing; the second straight shaft guide section 3111 and the second inner cylindrical hole section 3122 cooperate to form a gap seal, reducing leakage and pressure transmission of high pressure water to the combined seal; the second internal tapered sealing cone threads 3114 and the second external tapered sealing cone threads 3121 cooperate to form a tapered thread seal.
Referring to fig. 3, the drill rod body 31 is a hollow cylinder, and a circular through hole 313 is provided in the drill rod body 31 at the front end of the second axial sealing structure 312, coaxially with the second inner cylindrical hole section 3122.
Referring to fig. 5, the spiral groove 314 is formed in the outer peripheral wall of the drill rod body 31, so that the coal rock fragments can be discharged when the hydraulic measure is implemented, the weight of the drill rod is reduced, and the labor intensity is reduced.
Referring to fig. 4, the drill rod body 31 is a hollow cylinder, and a stepped hole 315 is provided in the drill rod body 31 at the front end of the second axial sealing structure 312, coaxially with the second inner cylindrical hole section 3122.
Referring to fig. 6, a spiral blade 316 protruding to the outside of the drill rod body 31 is provided on the outer circumferential wall of the drill rod body 31, so as to facilitate discharging of the coal rock fragments when implementing a hydraulic measure.
The top of the second straight-axis guide section 3111 is provided with a second chamfer 32. The angle of the second chamfer 32 is 30-60 degrees, preferably 45 degrees.
The second O-ring 3112 and the second right-angle slip ring 3113 are mounted in sequence in the water pressure direction.
The distance D from the front end of the rectangular groove to the top end of the second straight-axis guide section 3111 is larger than 15 mm.
The second straight shaft guide section 3111 and the second inner cylindrical bore section 3122 are concentric, and the second inner cylindrical bore section 3122 has an inner diameter greater than the outer diameter of the second straight shaft guide section 3111.
The inner diameter of the second inner cylindrical bore section 3122 is 0.5mm greater than the outer diameter of the second straight shaft guide section 3111.
The second straight shaft guide section 3111 and the first inner cylindrical bore section 2122 of the ultrahigh pressure fluid pressure conversion device 2 are concentric, and the inner diameter of the first inner cylindrical bore end 2122 is greater than the outer diameter of the second straight shaft guide section 3111 by 0.5 mm. The structure realizes the clearance sealing of the ultrahigh pressure sealing drill rod 3 and the ultrahigh pressure fluid pressure conversion device 2, and reduces the leakage and pressure transmission of high pressure water to the combined seal.
When the ultrahigh pressure sealing drill rod 3 and the ultrahigh pressure fluid pressure conversion device 2 are installed, an ultrahigh pressure axial sealing structure is adopted for connection, and the method specifically comprises the following steps: the second inner cone sealing cone thread 3114 at the front end of the ultrahigh pressure sealing drill rod 3 and the first outer cone sealing cone thread 2121 at the tail end of the ultrahigh pressure fluid pressure conversion device 2 form thread sealing; the installation of superhigh pressure sealed drilling rod 3 is convenient for to second straight axle direction section 3111 and second chamfer 32 at top thereof, and second O type circle 3112, second right angle sliding ring 3113 install in proper order and form the combination sealed in the rectangle recess, and bearing capacity is high, and the sealed awl screw thread 3114 of second interior awl of superhigh pressure sealed drilling rod 3 forms the awl thread seal with the sealed awl screw thread 2121 of first exterior awl of superhigh pressure fluid pressure conversion equipment 2.
Also adopt super high pressure axial seal structure to connect when a plurality of super high pressure seal drilling rod 3 end to end in proper order, specifically do: the first axial sealing structure 311 and the second axial sealing structure 312 of two adjacent ultrahigh pressure sealing drill rods 3 are matched, and a concentric annular gap exists between the second straight shaft guide section 3111 and the second inner cylindrical hole section 3122 to further form gap sealing, so that leakage and pressure transmission of high-pressure water to the combined sealing are reduced. The second O-shaped ring 3112 and the second right-angle slip ring 3113 are sequentially arranged in the rectangular groove to form combined sealing, and the pressure bearing capacity is high; the second inner cone sealing taper thread 3114 at the front end of the latter drill rod and the second outer cone sealing taper thread 3121 at the tail end of the former drill rod in the two adjacent drill rods form a taper thread seal; the second straight shaft guide section 3111 and the second chamfer 32 at the top thereof facilitate the sequential installation of the ultra-high pressure seal drill pipe 3.
The ultrahigh pressure sealing drill rod 3 and the ultrahigh pressure rotating water tail 5 are connected through an ultrahigh pressure axial sealing structure between the ultrahigh pressure sealing drill rod 3 and the ultrahigh pressure fluid pressure conversion device 2, and the specific connection structure is not described in detail.
The ultrahigh pressure axial sealing structure between the ultrahigh pressure sealing drill rod 3 and the ultrahigh pressure fluid pressure conversion device 2, between the ultrahigh pressure sealing drill rod 3 and between the ultrahigh pressure sealing drill rod 3 and the ultrahigh pressure rotating water tail 5 is formed into multiple sealing by gap sealing, combined sealing and taper thread sealing, the highest pressure bearing of the ultrahigh pressure axial sealing structure can reach 400MPa and is even higher, and the ultrahigh pressure axial sealing structure has the advantages of high pressure resistance, smooth installation, multiple repeated dismounting times and the like.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. The utility model provides an ultrahigh pressure fluid pressure conversion equipment, its characterized in that, the device include ultrahigh pressure fluid pressure conversion equipment body and ultrahigh pressure fluid pressure conversion valve body the front end of ultrahigh pressure fluid pressure conversion equipment body is equipped with first seal section, and the tail end is equipped with the second seal section this internal second seal section front end of ultrahigh pressure fluid pressure conversion equipment is equipped with the ladder through-hole, ultrahigh pressure fluid pressure conversion valve body is installed in the ladder through-hole, realizes adjusting the threshold value that seals ultrahigh pressure fluid pressure conversion equipment water flow path through ultrahigh pressure fluid pressure conversion valve body.
2. The ultrahigh-pressure fluid pressure conversion device according to claim 1, wherein a plurality of water jet nozzles are symmetrically installed on the ultrahigh-pressure fluid pressure conversion device body in a staggered manner in the circumferential direction.
3. The ultrahigh-pressure fluid pressure conversion device according to claim 1, wherein the plurality of water jet nozzles are located between the second sealing section and the ultrahigh-pressure fluid pressure conversion valve body, and a displacement distance L between two adjacent water jet nozzles is 2cm to 6 cm.
4. The ultrahigh-pressure fluid pressure conversion device according to claim 1, wherein the number of the water jet nozzles is 2 to 3; the included angle between each water jet nozzle and the side wall of the ultrahigh pressure fluid pressure conversion device body is 90 degrees.
5. The ultrahigh-pressure fluid pressure conversion device according to claim 1, wherein a coal rock breaking piece protruding outward is mounted to a front end of each water jet nozzle of the ultrahigh-pressure fluid pressure conversion device body.
6. The ultrahigh-pressure fluid pressure conversion device according to claim 1, wherein the first sealing section comprises a first straight shaft guide section, a first O-ring, a first right-angle slip ring and a first internally tapered sealing taper thread, wherein an annular groove is formed in the first straight shaft guide section, the first O-ring and the first right-angle slip ring are mounted in the annular groove, and the first internally tapered sealing taper thread is formed at the rear end of the first straight shaft guide section.
7. The ultrahigh-pressure fluid pressure switching device according to claim 1, wherein a first chamfer is provided at the top of the first straight guide section, and the first chamfer angle is 30 ° to 60 °.
8. The apparatus according to claim 1, wherein the second sealing section comprises a first outer conical sealing conical thread and a first inner cylindrical hole section which are arranged on the inner circumferential surface of the apparatus body and are arranged in sequence from the tail end to the front end.
9. The ultrahigh-pressure fluid pressure conversion device according to claim 1, wherein the ultrahigh-pressure fluid pressure conversion valve body comprises a compression spring, a valve rod, a positioning valve core, a pressure adjusting screw and a retainer ring which are sequentially arranged from front to back, the compression spring is sleeved outside the valve rod, the positioning valve core is sleeved outside the pressure adjusting screw, the positioning valve core and the inner circumferential surface of the ultrahigh-pressure fluid pressure conversion device body are axially movably mounted through a key groove, the front end of the pressure adjusting screw is embedded into the valve rod and connected in a threaded manner, the retainer ring is positioned at the rear end of the pressure adjusting screw and is arranged in a groove formed in the inner circumferential surface of the ultrahigh-pressure fluid pressure conversion device body, a first conical surface is arranged at the diameter-changing part of the stepped through hole, and a second conical surface matched with the first conical surface is arranged at the front end of the valve rod; the distance between the positioning valve core and the first conical surface of the stepped through hole is adjusted by rotating the pressure adjusting screw rod, the deformation of the compression spring is changed, and then the threshold value of the water flow passage of the ultrahigh pressure fluid pressure conversion device is adjusted and closed; when the pressure of the working liquid is greater than a threshold value, the second conical surface is contacted with the first conical surface, and a water flow passage in the ultrahigh pressure fluid pressure conversion device is closed; when the pressure of the working liquid is smaller than the threshold value, the second conical surface is separated from the first conical surface, and a water flow passage in the ultrahigh pressure fluid pressure conversion device is opened.
10. The ultrahigh-pressure fluid pressure switching device according to claim 9, wherein a front end of the compression spring abuts against a step surface of the step through hole of the ultrahigh-pressure fluid pressure switching device body, and a rear end thereof abuts against a front end surface of the positioning spool.
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| CN202110584382.7A CN113323591B (en) | 2021-05-27 | 2021-05-27 | Ultrahigh-pressure fluid pressure conversion device |
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| CN113323591B (en) | 2024-01-26 |
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