CN108693069B - Drilling coal dust gas desorption characteristic parameter measurement while drilling device - Google Patents
Drilling coal dust gas desorption characteristic parameter measurement while drilling device Download PDFInfo
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- CN108693069B CN108693069B CN201810918137.3A CN201810918137A CN108693069B CN 108693069 B CN108693069 B CN 108693069B CN 201810918137 A CN201810918137 A CN 201810918137A CN 108693069 B CN108693069 B CN 108693069B
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- 238000005553 drilling Methods 0.000 title claims abstract description 57
- 238000003795 desorption Methods 0.000 title claims abstract description 26
- 239000002817 coal dust Substances 0.000 title claims abstract description 23
- 238000005259 measurement Methods 0.000 title abstract description 19
- 238000007789 sealing Methods 0.000 claims abstract description 50
- 238000009434 installation Methods 0.000 claims abstract description 31
- 239000003245 coal Substances 0.000 claims abstract description 22
- 239000003034 coal gas Substances 0.000 claims abstract description 17
- 238000012856 packing Methods 0.000 claims abstract description 8
- 239000002893 slag Substances 0.000 claims description 27
- 238000001816 cooling Methods 0.000 claims description 14
- 230000036346 tooth eruption Effects 0.000 claims description 14
- 230000004323 axial length Effects 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 238000003860 storage Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 21
- 238000007599 discharging Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 241001074085 Scophthalmus aquosus Species 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
- G01N7/02—Analysing materials by measuring the pressure or volume of a gas or vapour by absorption, adsorption, or combustion of components and measurement of the change in pressure or volume of the remainder
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Abstract
The invention discloses a device for measuring desorption characteristic parameters of coal dust and gas in a drilling hole while drilling, which comprises a double-wall drill rod, an outer pipe and a drill bit, wherein the front end of the outer pipe is connected with the drill bit; an installation cavity is arranged between the outer pipe and the drill bit, a measuring device and a piston type sealing device in the pipe are arranged in the installation cavity, and the measuring device is positioned on the front side of the piston type sealing device in the pipe; the double-wall drill pipe comprises a double-wall drill pipe outer pipe, a double-wall drill pipe inner pipe which is in clearance fit with the double-wall drill pipe outer pipe is arranged in the double-wall drill pipe outer pipe in an inner sleeve mode, and an expansion gap is formed between the double-wall drill pipe outer pipe and the double-wall drill pipe inner pipe; the double-wall drill pipe inner pipe penetrates through the drill pipe connector and is hermetically connected with the rear end of the piston outer pipe, the double-wall drill pipe outer pipe is fixedly connected with the drill pipe connector, and the drill hole packing device is sleeved outside the double-wall drill pipe outer pipe. The device for measuring the characteristic parameter of the desorption of the coal dust gas during drilling can measure the gas parameter of the coal bed without drilling in the drilling process, and improves the continuity of the measurement work and the drilling work.
Description
Technical Field
The invention belongs to the technical field of analyzing materials by measuring the pressure or volume of gas or steam, and particularly relates to a device for measuring characteristic parameters of coal dust and gas desorption while drilling.
Background
Coal and gas outburst is one of the main disasters seriously threatening the safety production of coal mines. For decades, China has made a great deal of and highly effective research on the anti-outburst medicine, and a set of 'four-in-one' comprehensive anti-outburst system is formed. In the process of coal mining, the measurement of coal bed gas parameters is always the premise of safe mining of a gas mine, and particularly, the timely and effective measurement of the gas parameters is one of the problems which must be solved in the high-efficiency mine construction of China. At present, coal bed gas parameters are mostly measured by taking out coal samples from a coal bed drill and placing the coal samples in a specific instrument device, the measurement method generally has the problems of high sampling equipment requirement, poor measurement working continuity and the like, the measurement result precision can be seriously influenced, and the occurrence property of the coal bed gas cannot be accurately reflected.
Therefore, need provide a new measuring device, can not remove the brill at the brill in-process, and what is measured where is bored, make measure with beat and bore two kinds of borehole operation and go on in succession, improve the efficiency of whole mine exploitation.
Disclosure of Invention
In view of the above, the present invention provides a device for measuring while drilling characteristic parameters of coal dust and gas desorption in a drill hole, which can measure coal seam gas parameters without removing the drill in the drilling process, and improve the continuity between the measurement and the drilling.
In order to achieve the purpose, the invention provides the following technical scheme:
a drilling coal dust gas desorption characteristic parameter measurement while drilling device comprises a double-wall drill rod, an outer pipe and a drill bit, wherein a drill rod connector is arranged between the double-wall drill rod and the outer pipe, and the front end of the outer pipe is connected with the drill bit;
an installation cavity is arranged between the outer pipe and the drill bit, a measuring device and an in-pipe piston type sealing device are arranged in the installation cavity, and the measuring device is positioned on the front side of the in-pipe piston type sealing device;
the outer diameter of the measuring device is smaller than the inner diameter of the mounting cavity, and the rear end of the measuring device is provided with a connector;
the piston type sealing device in the tube comprises a piston outer tube with the outer diameter smaller than the inner diameter of the installation cavity, a front end limiting plate is arranged at the front end of the piston outer tube, a rear end limiting ring is arranged at the rear end of the piston outer tube, a piston cavity is formed between the front end limiting plate and the rear end limiting ring, a front end connecting hole and a rear end connecting hole are respectively formed in the side walls of two ends of the piston cavity, and a piston mechanism is arranged in the piston cavity; the piston mechanism closes the rear end connecting hole and opens the front end connecting hole in a free state; when the piston mechanism is subjected to an axial external force of the double-wall drill rod in the direction of the drill bit, the front end connecting hole is closed, and the rear end connecting hole is opened;
the front end of the piston outer tube is hermetically connected with the connector, and a connecting hole for communicating the measuring device with the piston cavity is formed in the front end limiting plate;
the double-wall drill pipe comprises a double-wall drill pipe outer pipe, a double-wall drill pipe inner pipe in clearance fit with the double-wall drill pipe outer pipe is arranged in the double-wall drill pipe outer pipe in an inner sleeve mode, and an expansion gap is formed between the double-wall drill pipe outer pipe and the double-wall drill pipe inner pipe; the double-wall drill pipe inner pipe penetrates through the drill pipe connector and is hermetically connected with the rear end of the piston outer pipe, the double-wall drill pipe outer pipe is fixedly connected with the drill pipe connector, and a drilling hole packing device is sleeved outside the double-wall drill pipe outer pipe;
the drilling hole packing device comprises an outer sleeve fixedly sleeved outside the double-wall drill rod, the outer sleeve comprises a sleeve front section, a sleeve rear section and an expandable section positioned between the sleeve front section and the sleeve rear section, the expandable section comprises expandable rubber sleeved outside the double-wall drill rod, two ends of the expandable rubber are respectively sleeved with a sealing protection ring, an expansion protruding gap is arranged between the two sealing protection rings, and an expansion connecting hole for communicating the expandable rubber with the expansion gap is arranged on the outer pipe of the double-wall drill rod;
the outer peripheral wall of the rear end of the piston outer tube is provided with a sealing ring which extends outwards in the radial direction, the sealing ring is in close fit with the inner wall of the installation cavity, and the sealing ring is positioned on the rear side of the rear end connecting hole back to the drill bit; or a sealing structure positioned at the front end of the expansion connecting hole is arranged between the double-wall drill rod inner pipe and the double-arm drill rod outer pipe; or a sealing structure is arranged between the double-wall drill pipe inner pipe and the drill pipe connector;
the front end face of the drill bit is provided with a small slag discharge hole, the side wall of the drill bit is provided with a small cooling hole for cooling, and the small slag discharge hole and the small cooling hole are communicated with the mounting cavity and a gap between the measuring devices.
Further, the front end limiting plate and the connector are provided with a filter screen therebetween.
Furthermore, a circle of outer cutting teeth and a circle of inner cutting teeth are annularly distributed on the front end face of the drill bit, and the inner cutting teeth are located in the outer cutting teeth.
Furthermore, the small slag discharge holes are formed in the inner cutting teeth, and at least one small slag discharge hole is formed in the small slag discharge holes at intervals.
Furthermore, survey device includes close coupling's preceding shell and backshell, the connector sets up on the rear end face of backshell, just be equipped with measuring element in the connector, be equipped with survey circuit and store the installation cavity in the backshell, be equipped with the power installation cavity in the preceding shell.
Further, the front shell is fixedly connected with the drill bit, and an external hole used for communicating the small slag discharging hole with a gap between the installation cavity and the measuring device is formed in the shell on the side of the rear shell.
Furthermore, the piston outer tube comprises a front end outer tube, a middle connecting tube and a rear end outer tube, and two ends of the middle connecting tube are respectively fixedly connected with the front end outer tube and the rear end outer tube; the front end limiting plate is arranged in the front end outer pipe, the rear end limiting ring is arranged in the rear end outer pipe, and the front end outer pipe is hermetically connected with the connector.
Further, the piston mechanism comprises a fixed sleeve fixedly installed in the middle of the piston cavity, a guide rod is installed in the fixed sleeve in a sleeved mode, a limiting sleeve sleeved on the guide rod is fixedly installed at the front end of the fixed sleeve, a limiting ring extending inwards in the radial direction is arranged at the rear end of the fixed sleeve, a connecting rod sleeved in the limiting ring in a sliding fit mode is arranged at the rear end of the guide rod, and a reset spring located between the limiting sleeve and the connecting rod is sleeved on the guide rod in a sleeved mode; the front end of the guide rod extending out of the limiting sleeve is fixedly provided with a front end piston head, the rear end of the connecting rod extending out of the limiting ring is fixedly provided with a rear end piston head, the axial distance between the front end connecting hole and the rear end limiting ring is larger than the axial length of the piston mechanism, and the axial distance between the rear end connecting hole and the front end limiting plate is larger than the axial length of the piston mechanism.
Furthermore, a positioning pin is arranged between the middle connecting pipe and the fixed sleeve.
The invention has the beneficial effects that:
the use process of the drill hole coal dust gas desorption characteristic parameter measurement while drilling device comprises the following steps:
in the drilling process, water is fed from the inner pipe of the double-wall drill rod, the piston mechanism is subjected to a force towards the direction of the drill bit, the rear end connecting hole is opened, the front end connecting hole is closed, water flow enters a gap between the outer pipe of the piston and the mounting cavity from the rear end connecting hole and flows out of the slag discharging small hole and the cooling small hole respectively, and the two water flows play roles in discharging slag and cooling the drill bit respectively; water flow carries slag to be discharged from a space between the drilling tool and the drilled hole;
when the drill bit is driven to a specified measuring position, emptying and stopping water, wherein the piston mechanism is in a free state, namely a connecting hole at the rear end is closed, and a connecting hole at the front end is opened; then drilling for a certain distance, stripping coal from the front coal wall, injecting water with certain pressure into a gap between the outer pipe of the double-wall drill rod and the inner pipe of the double-wall drill rod after the drilling is retreated for a certain distance, wherein a sealing ring hermetically matched with the installation cavity is arranged on the outer peripheral wall of the rear end of the outer pipe of the piston, water cannot enter the installation cavity at the moment, the water enters the expansion rubber through the expansion connecting hole, the expansion rubber is driven to expand and deform, the deformed expansion rubber radially protrudes outwards from the expansion protruding gap, and the drilled hole is sealed, so that a section of closed space from the bottom end of the drilled hole to the expansion rubber is formed; in the closed space, the gas desorbed from the coal enters the measuring device from the bottom end of the drill hole to the drill bit through the front connecting hole and the connecting hole, and the measuring device measures, records and stores the signal of the gas desorption pressure of the coal; after the measurement is finished, slag is discharged, the next cycle is carried out, and the continuity of the measurement work and the drilling work can be realized by repeating the steps.
In conclusion, the device for measuring the characteristic parameter of the desorption of the coal dust and gas during drilling can measure the coal bed gas parameter without drilling, improve the continuity of the measurement work and the drilling work and effectively improve the measurement precision.
Drawings
In order to make the object, technical scheme and beneficial effect of the invention more clear, the invention provides the following drawings for explanation:
FIG. 1 is a schematic structural diagram of an embodiment of a device for measuring characteristic parameters of desorption of coal dust and gas while drilling according to the invention;
FIG. 2 is a schematic view of a drill bit;
FIG. 3 is a top view of FIG. 2;
FIG. 4 is a schematic view of the structure of the measuring apparatus;
FIG. 5 is a schematic diagram of the piston type sealing device in the pipe;
FIG. 6 is a schematic structural view of a double-walled drill pipe;
fig. 7 is a schematic flow direction diagram of water flow, gas flow and water-carried slag in the drilling process and the measurement process of the device for measuring the desorption characteristic parameters of the coal dust and gas during drilling according to the embodiment.
Description of reference numerals:
1, drilling a bit; 1-1, small deslagging holes; 1-2 cooling the small holes; 1-3 external cutting picks; 1-4 inner cutting teeth;
2 a measuring device; 2-1, filtering by using a filter screen; 2-2 connecting heads; 2-3 measuring circuit and storage installation cavity; 2-4 power supply installation cavities; 2-5 of external holes; 2-6 sealing rings;
3, an outer tube;
4, a piston type sealing device in the pipe; 4-1 front end outer tube; 4-2, connecting holes at the front end; 4-3 connecting holes; 4-4 positioning pins; 4-5 middle connecting pipes; 4-6 rear end outer tube; 4-7 rear end connecting holes; 4-8-rear piston head; 4-9 front end piston head; 4-10 of a limiting sleeve; 4-11 guide rods; 4-12 return springs; 4-13 connecting rods; 4-14 sealing rings; 4-15 front end limiting plates; 4-16 rear end limit rings; 4-17 fixation sleeves; 4-18-seal ring; 4-19 stop collar;
5, connecting a drill rod;
6 double-wall drill pipes; 6-1 double-wall drill pipe outer pipe; 6-2 double-wall drill pipe inner pipe; 6-3 expansion connecting hole;
7 drilling and packing devices; 7-1, sleeving the front section of the rod; 7-2, sleeving the rear section of the rod; 7-3 expandable rubber; 7-4 sealing protection ring; 7-5 expanding the protruding gap;
8 water flow inner channel;
9 water flow outer channel.
Detailed Description
The present invention is further described with reference to the following drawings and specific examples so that those skilled in the art can better understand the present invention and can practice the present invention, but the examples are not intended to limit the present invention.
Fig. 1 is a schematic structural diagram of an embodiment of the device for measuring characteristic parameters of coal dust and gas desorption while drilling according to the invention. The device for measuring the characteristic parameter of the coal dust and gas desorption during drilling comprises a double-wall drill rod 6, an outer pipe 3 and a drill bit 1, wherein a drill rod connector 5 is arranged between the double-wall drill rod 6 and the outer pipe 3, and the front end of the outer pipe 3 is connected with the drill bit 1.
In the embodiment, an installation cavity is arranged between the outer pipe 3 and the drill bit 1, a measuring device 2 and a piston type sealing device 4 in the pipe are installed in the installation cavity, and the measuring device 2 is positioned on the front side of the piston type sealing device 4 in the pipe.
The front end face of the drill bit 1 of the embodiment is provided with a small slag discharge hole 1-1, the side wall of the drill bit 1 is provided with a small cooling hole 1-2 for cooling, and the small slag discharge hole 1-1 and the small cooling hole 1-2 are both communicated with a gap between the installation cavity and the measuring device 2. The front end face of the drill bit 1 is annularly provided with a circle of outer cutting teeth 1-3 and a circle of inner cutting teeth 1-4, and the inner cutting teeth 1-4 are located within the outer cutting teeth 1-3. Specifically, the number of the outer cutting teeth is 1-3, and the number of the inner cutting teeth is 3. The small slag discharge holes 1-1 are arranged within the inner cutting teeth 1-4, and at least one small slag discharge hole 1-1 is arranged at intervals. The number of the small slag discharge holes 1-1 is 2 at intervals in the present embodiment.
The outer diameter of the measuring device 2 of the embodiment is smaller than the inner diameter of the installation cavity, and the rear end of the measuring device 2 is provided with a connector 2-2. Specifically, the measuring device 2 comprises a front shell and a rear shell which are connected in a sealing way, and a sealing ring 2-6 is arranged between the front shell and the rear shell. The connector 2-2 is arranged on the rear end face of the rear shell, a measuring element is arranged in the connector 2-2, a measuring circuit and a storage installation cavity 2-3 are arranged in the rear shell, and a power supply installation cavity 2-4 is arranged in the front shell. The front shell is fixedly connected with the drill bit 1, and an external hole 2-5 for communicating a gap between the small slag discharge hole 1-1 and the installation cavity and the measuring device 2 is arranged in the shell on the side of the rear shell. The measuring device can refer to the chinese patent application with publication number CN105241785A, which will not be described again.
The piston type sealing device 4 in the tube comprises a piston outer tube with the outer diameter smaller than the inner diameter of an installation cavity, wherein the front end of the piston outer tube is provided with a front end limiting plate 4-15, the rear end of the piston outer tube is provided with a rear end limiting ring 4-16, a piston cavity is formed between the front end limiting plate 4-15 and the rear end limiting ring 4-16, the side walls of the two ends of the piston cavity are respectively provided with a front end connecting hole 4-2 and a rear end connecting hole 4-7, and a piston mechanism is arranged in the piston cavity; the piston mechanism closes the rear end connecting hole 4-7 and opens the front end connecting hole 4-2 in a free state; and when the piston mechanism receives an axial external force of the double-wall drill rod 6 in the direction pointing to the drill bit 1, the front end connecting hole 4-2 is closed and the rear end connecting hole 4-7 is opened. The front end of the piston outer tube is hermetically connected with the connector 2-2, a connecting hole 4-3 for communicating the measuring device 2 with the piston cavity is formed in the front end limiting plate 4-15, and a filter screen 2-1 is arranged between the front end limiting plate 4-15 and the connector 2-2.
The double-wall drill pipe 6 comprises a double-wall drill pipe outer pipe 6-1, a double-wall drill pipe inner pipe 6-2 which is in clearance fit with the double-wall drill pipe outer pipe 6-1 is arranged in the double-wall drill pipe outer pipe 6-1 in an inner sleeve mode, and an expansion gap is formed between the double-wall drill pipe outer pipe 6-1 and the double-wall drill pipe inner pipe 6-2; the double-wall drill rod inner pipe 6-2 penetrates through the drill rod connector 5 and is hermetically connected with the rear end of the piston outer pipe, and a sealing ring 4-14 is arranged between the double-wall drill rod inner pipe 6-2 and the piston outer pipe. The double-wall drill pipe outer pipe 6-1 is fixedly connected with the drill pipe connector 5, the double-wall drill pipe inner pipe 6-2 of the embodiment is in clearance fit with the drill pipe connector 5, and a sealing ring can be arranged between the double-arm drill pipe inner pipe 6-2 and the drill pipe connector 5. The outer sleeve of the double-wall drill pipe outer pipe 6-1 is provided with a drilling packing device 7.
The drilling hole packing device 7 comprises an outer sleeve fixedly sleeved outside a double-wall drill pipe outer pipe 6-1, the outer sleeve comprises a sleeve front section 7-1, a sleeve rear section 7-2 and an expandable section located between the sleeve front section 7-1 and the sleeve rear section 7-2, the expandable section comprises expandable rubber 7-3 sleeved outside the double-wall drill pipe outer pipe 6-1, two ends of the expandable rubber 7-3 are respectively sleeved with sealing protection rings 7-4, an expansion protruding gap 7-5 is arranged between the two sealing protection rings 7-4, and an expansion connecting hole 6-3 used for communicating the expandable rubber 7-3 with the expansion gap is formed in the double-wall drill pipe outer pipe 6-1.
The outer peripheral wall of the rear end of the piston outer tube is provided with sealing rings 4-18 extending outwards in the radial direction, the sealing rings 4-18 are in sealing fit with the inner wall of the mounting cavity, and the sealing rings 4-18 are positioned on the rear side, back to the drill bit 1, of the rear end connecting hole 4-7; or a sealing structure positioned at the front end of the expansion connecting hole 6-3 is arranged between the double-wall drill rod inner pipe 6-2 and the double-arm drill rod outer pipe 6-1; or a sealing structure is arranged between the double-wall drill rod inner pipe 6-2 and the drill rod connector 5; the technical purpose of sealing and driving the expandable rubber 7-3 to expand and deform can be achieved. In the embodiment, the double-wall drill pipe inner pipe 6-2 and the double-arm drill pipe outer pipe 6-1 and the double-wall drill pipe inner pipe 6-2 and the drill pipe connector 5 are in clearance fit, a through hole is formed in the double-wall drill pipe inner pipe 6-2 and forms an inner water flow channel 8, and an outer water flow channel 9 is formed between the double-wall drill pipe inner pipe 6-2 and the double-arm drill pipe outer pipe 6-1 and between the double-wall drill pipe inner pipe 6-2 and the drill pipe connector 5.
And the peripheral wall of the rear end of the piston outer tube is provided with a sealing ring 4-18 which extends radially outwards, the sealing ring 4-18 is in close fit with the inner wall of the mounting cavity, and the sealing ring 4-18 is positioned at the rear end connecting hole 4-7 and faces away from the rear side of the drill bit 1.
Furthermore, the piston outer tube of the embodiment comprises a front end outer tube 4-1, a middle connecting tube 4-5 and a rear end outer tube 4-6, wherein two ends of the middle connecting tube 4-5 are fixedly connected with the front end outer tube 4-1 and the rear end outer tube 4-6 respectively; the front end limiting plate 4-15 is arranged in the front end outer tube 4-1, the rear end limiting ring 4-16 is arranged in the rear end outer tube 4-6, and the front end outer tube 4-1 is hermetically connected with the connector 2-2.
Furthermore, the piston mechanism of the embodiment comprises a fixed sleeve 4-17 fixedly installed in the middle of the piston cavity, a guide rod 4-11 is installed in the fixed sleeve 4-17 in a sleeved mode, a limit sleeve 4-10 sleeved on the guide rod 4-11 is fixedly installed at the front end of the fixed sleeve 4-17, a limit ring 4-19 extending inwards in the radial direction is arranged at the rear end of the fixed sleeve 4-17, a connecting rod 4-13 sleeved in the limit ring 4-19 in a sliding fit mode is arranged at the rear end of the guide rod 4-11, and a reset spring 4-12 located between the limit sleeve 4-10 and the connecting rod 4-13 is sleeved on the guide rod 4-11; the front end of the guide rod 4-11 extending out of the limiting sleeve 4-10 is fixedly provided with a front end piston head 4-9, the rear end of the connecting rod 4-13 extending out of the limiting ring 4-19 is fixedly provided with a rear end piston head 4-8, the axial distance between the front end connecting hole 4-2 and the rear end limiting ring 4-16 is larger than the axial length of the piston mechanism, and the axial distance between the rear end connecting hole 4-7 and the front end limiting plate 4-15 is larger than the axial length of the piston mechanism. In the embodiment, a positioning pin 4-4 is arranged between the middle connecting pipe 4-5 and the fixed sleeve 4-17.
The use process of the device for measuring the desorption characteristic parameters of the coal dust and gas during drilling in the embodiment is as follows:
in the drilling process, water is fed from the inner pipe of the double-wall drill rod, the piston mechanism is subjected to a force towards the direction of the drill bit, the rear end connecting hole is opened, the front end connecting hole is closed, water flow enters a gap between the outer pipe of the piston and the mounting cavity from the rear end connecting hole and flows out of the slag discharging small hole and the cooling small hole respectively, and the two water flows play roles in discharging slag and cooling the drill bit respectively; the water flow carries slag out of the space between the drilling tool and the drilled hole.
When the drill bit is driven to a specified measuring position, emptying and stopping water, wherein the piston mechanism is in a free state, namely a connecting hole at the rear end is closed, and a connecting hole at the front end is opened; then drilling for a certain distance, stripping coal from the front coal wall, injecting water with certain pressure into a gap between the outer pipe of the double-wall drill rod and the inner pipe of the double-wall drill rod after the drilling is retreated for a certain distance, wherein a sealing ring hermetically matched with the installation cavity is arranged on the outer peripheral wall of the rear end of the outer pipe of the piston, water cannot enter the installation cavity at the moment, the water enters the expansion rubber through the expansion connecting hole, the expansion rubber is driven to expand and deform, the deformed expansion rubber radially protrudes outwards from the expansion protruding gap, and the drilled hole is sealed, so that a section of closed space from the bottom end of the drilled hole to the expansion rubber is formed; in the closed space, the gas desorbed from the coal enters the measuring device from the bottom end of the drill hole to the drill bit through the front connecting hole and the connecting hole, and the measuring device measures, records and stores the signal of the gas desorption pressure of the coal; after the measurement is finished, slag is discharged, the next cycle is carried out, and the continuity of the measurement work and the drilling work can be realized by repeating the steps.
In conclusion, the device for measuring the characteristic parameter of the desorption of the coal dust and the gas during drilling can measure the gas parameter of the coal bed without drilling in the drilling process, improves the continuity of the measurement work and the drilling work, and can effectively improve the measurement precision.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (9)
1. The utility model provides a drilling coal bits gas desorption characteristic parameter is along with boring survey device which characterized in that: the drill rod connecting device comprises a double-wall drill rod (6), an outer pipe (3) and a drill bit (1), wherein a drill rod connecting head (5) is arranged between the double-wall drill rod (6) and the outer pipe (3), and the front end of the outer pipe (3) is connected with the drill bit (1);
an installation cavity is arranged between the outer pipe (3) and the drill bit (1), a measuring device (2) and a piston type sealing device (4) in the pipe are installed in the installation cavity, and the measuring device (2) is located on the front side of the piston type sealing device (4) in the pipe;
the outer diameter of the measuring device (2) is smaller than the inner diameter of the installation cavity, and the rear end of the measuring device (2) is provided with a connector (2-2);
the piston type sealing device (4) in the tube comprises a piston outer tube with the outer diameter smaller than the inner diameter of the installation cavity, a front end limiting plate (4-15) is arranged at the front end of the piston outer tube, a rear end limiting ring (4-16) is arranged at the rear end of the piston outer tube, a piston cavity is formed between the front end limiting plate (4-15) and the rear end limiting ring (4-16), a front end connecting hole (4-2) and a rear end connecting hole (4-7) are respectively formed in the side walls of two ends of the piston cavity, and a piston mechanism is arranged in the piston cavity; the piston mechanism closes the rear end connecting hole (4-7) and opens the front end connecting hole (4-2) in a free state; when the piston mechanism is subjected to an axial external force of the double-wall drill rod (6) in the direction pointing to the drill bit (1), the front end connecting hole (4-2) is closed, and the rear end connecting hole (4-7) is opened;
the front end of the piston outer tube is hermetically connected with the connector (2-2), and a connecting hole (4-3) for communicating the measuring device (2) with the piston cavity is formed in the front end limiting plate (4-15);
the double-wall drill pipe (6) comprises a double-wall drill pipe outer pipe (6-1), a double-wall drill pipe inner pipe (6-2) which is in clearance fit with the double-wall drill pipe outer pipe (6-1) is arranged in the double-wall drill pipe outer pipe (6-1) in an inner sleeve mode, and an expansion gap is formed between the double-wall drill pipe outer pipe (6-1) and the double-wall drill pipe inner pipe (6-2); the double-wall drill rod inner pipe (6-2) penetrates through the drill rod connector (5) and is hermetically connected with the rear end of the piston outer pipe, the double-wall drill rod outer pipe (6-1) is fixedly connected with the drill rod connector (5), and a drilling hole packing device (7) is sleeved outside the double-wall drill rod outer pipe (6-1);
the drilling hole packing device (7) comprises an outer sleeve rod fixedly sleeved outside the outer pipe (6-1) of the double-wall drill rod, the outer loop bar comprises a loop bar front section (7-1), a loop bar rear section (7-2) and an expandable section positioned between the loop bar front section (7-1) and the loop bar rear section (7-2), the expandable section comprises expandable rubber (7-3) sleeved outside the double-wall drill pipe outer pipe (6-1), two ends of the expandable rubber (7-3) are respectively sleeved with a sealing protection ring (7-4), an expansion protruding gap is arranged between the two sealing protection rings (7-4), an expansion connecting hole (6-3) for communicating the expandable rubber (7-3) with the expansion gap is formed in the double-wall drill pipe outer pipe (6-1);
the outer peripheral wall of the rear end of the piston outer tube is provided with a sealing ring (4-18) which extends outwards in the radial direction, the sealing ring (4-18) is in sealing fit with the inner wall of the mounting cavity, and the sealing ring (4-18) is positioned on the rear side, back to the drill bit (1), of the rear end connecting hole (4-7); or a sealing structure positioned at the front end of the expansion connecting hole (6-3) is arranged between the double-wall drill rod inner pipe (6-2) and the double-wall drill rod outer pipe; or a sealing structure is arranged between the double-wall drill rod inner pipe (6-2) and the drill rod connector (5);
the slag discharge device is characterized in that a slag discharge small hole (1-1) is formed in the end face of the front end of the drill bit (1), a cooling small hole (1-2) used for cooling is formed in the side wall of the drill bit (1), and the slag discharge small hole (1-1) and the cooling small hole (1-2) are communicated with a gap between the installation cavity and the measuring device (2).
2. The device for measuring desorption characteristic parameters of coal dust and gas while drilling according to claim 1, is characterized in that: a filter screen (2-1) is arranged between the front end limiting plate (4-15) and the connector (2-2).
3. The device for measuring desorption characteristic parameters of coal dust and gas while drilling according to claim 1, is characterized in that: the annular cutting pick is characterized in that a circle of outer cutting pick (1-3) and a circle of inner cutting pick (1-4) are annularly distributed on the front end face of the drill bit (1), and the inner cutting pick (1-4) is located within the outer cutting pick (1-3).
4. The device for measuring desorption characteristic parameters of coal dust and gas while drilling according to claim 3, is characterized in that: the small slag discharge holes (1-1) are formed in the inner cutting teeth (1-4), and at least one small slag discharge hole (1-1) is formed.
5. The device for measuring desorption characteristic parameters of coal dust and gas while drilling according to claim 1, is characterized in that: the measuring device (2) comprises a front shell and a rear shell which are connected in a sealing mode, the connector (2-2) is arranged on the rear end face of the rear shell, a measuring element is arranged in the connector (2-2), a measuring circuit and a storage installation cavity (2-3) are arranged in the rear shell, and a power supply installation cavity (2-4) is arranged in the front shell.
6. The device for measuring desorption characteristic parameters of coal dust and gas while drilling according to claim 5, is characterized in that: the front shell is fixedly connected with the drill bit (1), and an external hole (2-5) used for communicating a gap between the small slag discharge hole (1-1) and the installation cavity and the measuring device (2) is formed in the shell on the side of the rear shell.
7. The device for measuring desorption characteristic parameters of coal dust and gas while drilling according to claim 1, is characterized in that: the piston outer tube comprises a front end outer tube (4-1), a middle connecting tube (4-5) and a rear end outer tube (4-6), and two ends of the middle connecting tube (4-5) are respectively fixedly connected with the front end outer tube (4-1) and the rear end outer tube (4-6); the front end limiting plate (4-15) is arranged in the front end outer tube (4-1), the rear end limiting ring (4-16) is arranged in the rear end outer tube (4-6), and the front end outer tube (4-1) is hermetically connected with the connector (2-2).
8. The device for measuring desorption characteristic parameters of coal dust and gas while drilling according to claim 7, is characterized in that: the piston mechanism comprises a fixed sleeve (4-17) fixedly installed in the middle of the piston cavity, a guide rod (4-11) is installed in the fixed sleeve (4-17) in an sleeved mode, a limiting sleeve (4-10) sleeved on the guide rod (4-11) is fixedly installed at the front end of the fixed sleeve (4-17), a limiting ring (4-19) extending inwards in the radial direction is arranged at the rear end of the fixed sleeve (4-17), a connecting rod (4-13) sleeved in the limiting ring (4-19) in a sliding fit mode is arranged at the rear end of the guide rod (4-11), and a reset spring (4-12) located between the limiting sleeve (4-10) and the connecting rod (4-13) is sleeved on the guide rod (4-11); the front end of the guide rod (4-11) extending out of the limiting sleeve (4-10) is fixedly provided with a front end piston head (4-9), the rear end of the connecting rod (4-13) extending out of the limiting ring (4-19) is fixedly provided with a rear end piston head (4-8), the axial distance between the front end connecting hole (4-2) and the rear end limiting ring (4-16) is larger than the axial length of the piston mechanism, and the axial distance between the rear end connecting hole (4-7) and the front end limiting plate (4-15) is larger than the axial length of the piston mechanism.
9. The device for measuring desorption characteristic parameters of coal dust and gas while drilling according to claim 8, is characterized in that: a positioning pin (4-4) is arranged between the middle connecting pipe (4-5) and the fixed sleeve (4-17).
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| CN201810918137.3A CN108693069B (en) | 2018-08-13 | 2018-08-13 | Drilling coal dust gas desorption characteristic parameter measurement while drilling device |
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| CN201810918137.3A CN108693069B (en) | 2018-08-13 | 2018-08-13 | Drilling coal dust gas desorption characteristic parameter measurement while drilling device |
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| CN112523707B (en) * | 2020-12-03 | 2022-07-22 | 中煤科工集团重庆研究院有限公司 | Coal and gas outburst danger prediction while drilling device and prediction method thereof |
| CN113266347B (en) * | 2021-07-05 | 2022-05-13 | 中煤科工集团重庆研究院有限公司 | Near-bit coal seam gas parameter while-drilling comprehensive measurement device and method |
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