CN110219699A - A kind of measurement device and measuring method of the effective radius of influence of mash gas pumping drilling - Google Patents
A kind of measurement device and measuring method of the effective radius of influence of mash gas pumping drilling Download PDFInfo
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- CN110219699A CN110219699A CN201910333945.8A CN201910333945A CN110219699A CN 110219699 A CN110219699 A CN 110219699A CN 201910333945 A CN201910333945 A CN 201910333945A CN 110219699 A CN110219699 A CN 110219699A
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- 238000005553 drilling Methods 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000005086 pumping Methods 0.000 title claims abstract description 36
- 238000005259 measurement Methods 0.000 title claims abstract description 29
- 239000003245 coal Substances 0.000 claims abstract description 74
- 238000000605 extraction Methods 0.000 claims abstract description 35
- 238000012544 monitoring process Methods 0.000 claims abstract description 22
- 238000002347 injection Methods 0.000 claims abstract description 18
- 239000007924 injection Substances 0.000 claims abstract description 18
- 238000004088 simulation Methods 0.000 claims abstract description 14
- 238000012360 testing method Methods 0.000 claims abstract description 12
- 230000000087 stabilizing effect Effects 0.000 claims description 28
- 238000009530 blood pressure measurement Methods 0.000 claims description 19
- 238000012856 packing Methods 0.000 claims description 16
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 5
- 238000002474 experimental method Methods 0.000 claims description 3
- 229940058401 polytetrafluoroethylene Drugs 0.000 claims 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims 1
- 239000004810 polytetrafluoroethylene Substances 0.000 claims 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical compound FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 5
- 238000004321 preservation Methods 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 description 10
- 230000007423 decrease Effects 0.000 description 7
- 238000010276 construction Methods 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000007726 management method 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
- 230000002265 prevention Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/02—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells by mechanically taking samples of the soil
- E21B49/025—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells by mechanically taking samples of the soil of underwater soil, e.g. with grab devices
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
- E21F17/18—Special adaptations of signalling or alarm devices
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Soil Sciences (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Sampling And Sample Adjustment (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses the measurement device and measuring method of a kind of effective radius of influence of mash gas pumping drilling, measurement device includes coal core clamper, gas injection part, gas simulation extraction part and pressure test part.The present invention need to only construct after a coring drills in primitive coalbed and collect coal core sample, it is measured in laboratory, without a series of mash gas pumping drillings and the pressure observation drilling of constructing in coal seam, project amount substantially reduced, and successfully tested rate it is more traditional measuring method it is high；The coal quality and hole of coal core sample and crack are relatively uniform, and avoidable coalbed gas geology preservation, which changes, gives measurement bring error, and coal core sample is enclosed in coal core clamper, the problem long there is no exposure duration, and measurement accuracy rate is higher；It can be realized the tracking and monitoring in the not up to pilot process of extraction time, and then can guarantee the accuracy of measurement, the reasonable Arrangement that measurement result can drill for coal bed gas extraction provides theoretical foundation and data are supported.
Description
Technical field
The present invention relates to a kind of measurement device and measuring method, specifically a kind of effective shadow suitable for mash gas pumping drilling
The device and measuring method that radius is measured are rung, prevention and treatment and the Technologies For High Efficient Development field of coal mine gas disaster are belonged to.
Background technique
It is current China's coal-mine enterprise progress watt by arranging mash gas pumping drilling in coal seam to carry out the extraction of gas
The main means that this hazard management and gas drainage utilize.One of the important process of coal bed gas extraction drilling design is exactly to determine
The spacing of extraction borehole, i.e., the distance between two neighboring drilling.If the spacing of mash gas pumping drilling is too small, it will cause drillings
Project amount is big, at high cost, low in economic efficiency；If the spacing of mash gas pumping drilling is excessive, gas pumping effect is bad, is easy
It leaves extraction blank tape in coal seam, and then gas exceeding limit accident easily occurs when later period driving or back production are to the region.Therefore,
Before drilling design, need to test and determine in advance reasonable effective radius of influence of mash gas pumping drilling.
Currently, the measurement of the effective radius of influence of mash gas pumping drilling generallys use pressure decline method or gas remainder quantity measurement
Method.The basic skills principle of pressure decline method is: one extraction drilling of construction first in coal seam, then between the arrangement of the drilling two sides
Away from not equal several pressure observation holes (most design method is the drilling of two sides 3), if the pressure of peephole declines
When to expected numerical value (usually 50% or so of primitive coalbed gas pressure), then it is assumed that the distance for being bored into drainage holes is
The effective radius of influence of gas drainage.The shortcomings that pressure decline method, is: 1. since effective radius of influence of coal bed gas extraction drilling is usual
Smaller (within 3m), therefore the spacing being arranged between the pressure observation drilling of extraction hole two sides and mash gas pumping drilling is closer,
It is easy to happen string hole, and then causes to survey pressure failure；2. since coal seam is the heterogeneous rock material of height, coal seam internal void,
Crack is abundant and preservation is uneven, in addition there is also many small structural fractures etc. in coal seam, and then will lead to each drilling and surveys
The pressure arrived is not consistent, and reliability is poor, is inconvenient to compare and analyze；3. the successfully tested rate of live gas pressure is not
It is high, it is ensured that each drilling has pressure, is actually difficult.Therefore, the survey of the scene effectively radius of influence is carried out using pressure decline method
It is all very low to try success rate, typically at least to construct 3 groups or more, construction work amount is big, and observation cycle is long.
The drilling method for arranging and pressure decline method of gas remainder quantity measuring method are essentially identical, and difference is first to carry out gas pumping
It adopts, then its gas remainder quantity is measured in two sides construction tube sample boring again, and compare with the original gas bearing capacity in coal seam, to sentence
Sample position is determined whether in the effective radius of influence of gas drainage.The shortcomings that gas remainder quantity measuring method, is: 1. due to coal seam
Be it is heterogeneous, gas bearing capacity distribution is also very uneven, so being difficult to determine that the lower tube sample boring of gas bearing capacity is on earth
It is influenced by extraction or local gas bearing capacity is natively low；2. coal sample exposure duration is too long in sampling process, error is larger；③
Compared with pressure decline method, gas remainder quantity measuring method can not be implemented to observe changes of contents situation daily, can only make a reservation for reach pumping
Adopt sample after the time it is primary, the pilot process of not up to extraction time can not tracking observation.
The shortcomings that in view of pressure decline method and gas remainder quantity measuring method, has researcher to propose numerical simulation side again recently
Method also needs a large amount of parameter of on-the-spot test as mode input to eliminate above-mentioned influence factor, is not also one
A economically viable scheme.
Summary of the invention
In view of the above existing problems in the prior art, the present invention provides a kind of surveys of the effective radius of influence of mash gas pumping drilling
Determine device and measuring method, be capable of effective radius of influence of efficiently and accurately measurement mash gas pumping drilling, and then is taken out for coal-bed gas
The reasonable Arrangement of borehole provides theoretical foundation and data are supported.
To achieve the goals above, the measurement device of the effective radius of influence of this mash gas pumping drilling include coal core clamper,
Gas injection part, gas simulation extraction part and pressure test part；
The coal core clamper includes cylinder, plug and ring packing pad assembly；Cylinder is cylindrical structure, cylindrical structure
Both ends along its axial direction are pressure stabilizing end and negative pressure end, are equipped on the cartridge type outer surface of cylindrical structure along its axial direction multiple
The pressure tap being uniformly arranged, pressure tap run through the barrel of cylindrical structure along the radial direction of cylindrical structure；Plug is set as two pieces,
Two pieces plug seals be fixedly mounted on pressure stabilizing end and negative pressure end respectively, and plug is equipped with watt through plug along its axial direction
This access way；The quantity that ring packing pad assembly corresponds to plug is set as two sets, and ring packing pad assembly is arranged in plug face
To the end of cylinder lumen；
The gas injection unit, which sets up separately, is set to two sets, and two sets of gas injection parts respectively correspond pressure stabilizing end and negative pressure end and set
It sets, gas injection unit point includes gas pressure gas cylinder, and the delivery outlet of the gas pressure gas cylinder at corresponding pressure stabilizing end passes through controlling valve
It is connect with the gas access way for the plug being located on pressure stabilizing end, the delivery outlet of the gas pressure gas cylinder at corresponding negative pressure end passes through three
Port valve door is connect with the gas access way for the plug being located on negative pressure end；
The gas simulation extraction part includes vacuum pump, and another access installation of vacuum pump and three-way valve connects；
The pressure test part includes pressure sensor and monitoring computer；Pressure sensor corresponds to the survey pressure of cylinder
The quantity setting of mouth, the pressure input of pressure sensor are connected by pressure measurement valve and the pressure tap of cylinder, and multiple pressure pass
Sensor respectively with monitoring calculation mechatronics.
As a further improvement of the present invention, gas injection part further includes constant pressure delivery pump, corresponding pressure stabilizing end
The input terminal and output end of constant pressure delivery pump are connected with the gas pressure gas cylinder at corresponding pressure stabilizing end and controlling valve respectively, corresponding negative
The input terminal and output end of the constant pressure delivery pump of pressure side are connected with the gas pressure gas cylinder at corresponding negative pressure end and three-way valve respectively.
As a further improvement of the present invention, controlling valve, three-way valve and pressure measurement valve are solenoid electric valves,
Controlling valve, three-way valve and pressure measurement valve respectively with monitoring calculation mechatronics.
As a kind of embodiment of ring packing pad assembly of the present invention, ring packing pad assembly is combination sealing pad knot
Structure, including rubber washer, copper gasket and the teflin ring set gradually from inside to outside.
As a further improvement of the present invention, teflin ring is the small pyramidal structure of outer imperial palace, plug
Inner end be arranged to the pyramidal structure of teflin ring cooperate cone structure.
As a further improvement of the present invention, the quantity of pressure tap is no less than 5.
A kind of measuring method of the effective radius of influence of mash gas pumping drilling, comprising the following steps:
A. in the region of the gas drainage radius of influence to be determined, gas pressure measurement drilling of constructing measures primitive coalbed watt
This pressure simultaneously records；
B. the region this coal seam or wear a layer coring of constructing and drill and take out coal core sample, coal core sample is packed into
In the coal core clamper of the measurement device of the effective radius of influence of mash gas pumping drilling, and by ring packing pad assembly and plug into
Row strong fix blocks after the gas access way of plug carries out closed seal up for safekeeping to coal core sample, will be packaged with coal core sample
Cylinder is transported to ground experiment room；
C. cylinder and the gas injection part, gas simulation extraction part and pressure test part of coal core sample will be packaged with
Installation connection, the level pressure output pressure for then adjusting constant pressure delivery pump are primitive coalbed gas pressure and open gas pressure gas
Bottle, the constant pressure delivery pump and controlling valve at corresponding pressure stabilizing end are then successively opened, and control three-way valve to make corresponding negative pressure end
Constant pressure delivery pump is connected to the gas access way of the plug at corresponding negative pressure end, and methane gas injects coal core from cylinder both ends simultaneously
Sample；
D. whole pressure measurement valves is opened, the pressure value that monitoring computer feeds back each pressure sensor counts
And record, the open state of controlling valve is kept when the numerical value of pressure sensor reaches the original gas pressure in coal seam, setting is true
Three-way valve makes the vacuum pump at corresponding negative pressure end and the gas access way of the plug at corresponding negative pressure end after the extraction pressure of sky pump
Connection opens vacuum pump and carries out simulation extraction；
E. control monitoring computer interval counts and records the pressure value of each pressure sensor feedback, until reaching pre-
Fixed extraction number of days；
F. the pressure value of each pressure sensor is fitted by monitoring computer according to plug-in with exponential function, then
Pressure value needed for being up to the extraction radius of influence obtains function formula after bringing fitting into, acquires the gas drainage of primitive coalbed
The radius of influence.
As a further improvement of the present invention, in step a gas pressure measurement drilling at least construct two and to watt
This piezometry drilling measures primitive coalbed gas pressure respectively, and the level pressure output pressure that constant pressure delivery pump is adjusted in step c is
Maximum value in primitive coalbed gas pressure value.
As a further improvement of the present invention, the length of coal core sample is not less than 3m, and coal core sample in step b
End face polishes flat.
As a further improvement of the present invention, in step b coal core sample be monolith integral structure or by it is several not
With the structure that the sample section of length collectively constitutes, and the end face of coal core sample or sample section polishes flat.
Compared with prior art, the measurement device and measuring method of the effective radius of influence of this mash gas pumping drilling, it is only necessary to
Coal core sample is collected after one coring drilling of construction in primitive coalbed, is measured in laboratory, without in coal seam
Construct a series of mash gas pumping drillings and pressure observation drilling, project amount substantially reduces, and the survey that successfully tested rate is more traditional
Determine method height；In addition, this measuring method only needs the lesser coal core of one ruler degree, hole and crack phase in coal quality and coal core
To relatively uniform, it can avoid coalbed gas geology preservation and change to give measurement bring error, and coal core sample is enclosed in coal core clamper
Problem interior, long there is no exposure duration, measurement accuracy rate are higher；This measuring method is by the way of continuing to monitor, Neng Goushi
It is not up to the tracking and monitoring of the pilot process of extraction time now, and then can guarantee the accuracy of measurement, measurement result can be
The reasonable Arrangement of coal bed gas extraction drilling provides theoretical foundation and data are supported.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the measurement device of the effective radius of influence of mash gas pumping drilling of the present invention；
Fig. 2 is exponential function matched curve figure of the embodiment of the present invention.
In figure: 1, coal core sample, 2, cylinder, 3, rubber washer, 4, copper gasket, 5, teflin ring, 6, plug,
7, gas pressure gas cylinder, 8, constant pressure delivery pump, 9, controlling valve, 10, three-way valve, 11, pressure sensor, 12, monitoring calculation
Machine, 13, pressure measurement valve, 14, vacuum pump, 15, pressure stabilizing end, 16, negative pressure end.
Specific embodiment
The present invention will be further described with reference to the accompanying drawing.
As shown in Figure 1, the measurement device of the effective radius of influence of this mash gas pumping drilling includes coal core clamper, gas injection
Partially, gas simulation extraction part and pressure test part.
The coal core clamper includes cylinder 2, plug 6 and ring packing pad assembly；Cylinder 2 is cylindrical structure, cartridge type
Structure is pressure stabilizing end 15 and negative pressure end 16 along the both ends of its axial direction, along its axial direction on the cartridge type outer surface of cylindrical structure
Equipped with multiple pressure taps being uniformly arranged, pressure tap runs through the barrel of cylindrical structure along the radial direction of cylindrical structure, in order to protect
Card is surveyed and is pressed in accuracy, and the quantity of pressure tap is no less than 5；Plug 6 is set as two pieces, and two pieces plug 6 seals fixed peace respectively
On pressure stabilizing end 15 and negative pressure end 16, plug 6 is equipped with the gas access way through plug 6 along its axial direction；Annular
The quantity that sealing pad assembly corresponds to plug 6 is set as two sets, and plug 6 is arranged in towards 2 inner cavity of cylinder in ring packing pad assembly
End, ring packing pad assembly can use rubber seal mat structure or use the combination sealings mat structures such as reinforced seal,
As a kind of embodiment of ring packing pad assembly of the present invention, ring packing pad assembly is combination sealing mat structure, including from
Rubber washer 3, copper gasket 4 and the taper teflin ring 5 set gradually from inside to outside.
The gas injection unit, which sets up separately, is set to two sets, and two sets of gas injection parts respectively correspond pressure stabilizing end 15 and negative pressure end
16 settings, gas injection unit point include gas pressure gas cylinder 7, and the delivery outlet of the gas pressure gas cylinder 7 at corresponding pressure stabilizing end 15 passes through
Controlling valve 9 is connect with the gas access way for the plug 6 being located on pressure stabilizing end 15, the gas pressure gas cylinder at corresponding negative pressure end 16
7 delivery outlet is connect by three-way valve 10 with the gas access way for the plug 6 being located on negative pressure end 16.
The gas simulation extraction part includes vacuum pump 14, another access installation of vacuum pump 14 and three-way valve 10
Connection.
The pressure test part includes pressure sensor 11 and monitoring computer 12；Pressure sensor 11 corresponds to cylinder
The quantity of 2 pressure tap is arranged, and the pressure input of pressure sensor 11 is connected by pressure measurement valve 13 and the pressure tap of cylinder 2
It connects, multiple pressure sensors 11 are electrically connected with monitoring computer 12 respectively.
In continuous mode, for the ease of the gas input pressure of Isobarically Control gas injection part, as of the invention
Further improvement scheme, gas injection part further includes constant pressure delivery pump 8, the input of the constant pressure delivery pump 8 at corresponding pressure stabilizing end 15
End and output end are connected with the gas pressure gas cylinder 7 at corresponding pressure stabilizing end 15 and controlling valve 9 respectively, the constant pressure at corresponding negative pressure end 16
The input terminal and output end of delivery pump 8 are connected with the gas pressure gas cylinder 7 at corresponding negative pressure end 16 and three-way valve 10 respectively.
It is described so that certain mine coal layer arrangement mash gas pumping drilling draws out methane as an example below using this mash gas pumping drilling
The measuring method of the measurement device of effective radius of influence:
In the region of the gas drainage radius of influence to be determined, construction gas pressure measurement drills three first, and measurement obtains original
Beginning coal-bed gas pressure is respectively 1.8MPa, 1.0MPa and 1.6Mpa；
Then the region this coal seam or wear layer and construct the drilling of coring, taking length is 3.6m, outer diameter and cylinder
The coal core sample 1 of the internal diameter cooperation of body 2, then it is two sections that the coal core sample 1, which is divided to, every segment length 1.8m, then holds four
All use the liquid honing of 1000 mesh smooth and cavity length of the sum of the length of two sections of coal core samples 1 of guarantee with cylinder 2 in face
Then two sections of coal core samples 1 are successively placed in cylinder 2 by dimensional fits；Rubber is successively encased inside at pressure stabilizing end 15 and negative pressure end 16
After washer 3 and copper gasket 4 then plug 6 is tightened respectively and be mounted on plug 6 by 5 sets of taper teflin ring
The both ends of cylinder 2, coal core sample 1 i.e. under the clamping action of plug 6 and ring packing pad assembly strong fix in cylinder 2,
The gas access way for blocking plug 6 is completed the closed of coal core sample 1 and is sealed up for safekeeping, and the cylinder 2 of coal core sample 1 will be finally packaged with
It transports to ground experiment room；
Cylinder 2 and the gas injection part, gas simulation extraction part and pressure test part of coal core sample 1 will be packaged with
Installation connection, wherein the spacing between pressure sensor 11 is set as 40cm, is located at the outermost pressure sensor 11 of cylinder 2
Distance away from pressure stabilizing end 15 and negative pressure end 16 respectively sets position 10cm, and the level pressure output pressure for then adjusting constant pressure delivery pump 8 is
1.8MPa (maximum coal-bed gas pressure) opens gas pressure gas cylinder 7, then successively opens the constant pressure conveying at corresponding pressure stabilizing end 15
Pump 8 and controlling valve 9, and control three-way valve 10 and make blocking up for the constant pressure delivery pump 8 at corresponding negative pressure end 16 and corresponding negative pressure end 16
First 6 gas access way connection, methane gas inject coal core sample 1 from 2 both ends of cylinder simultaneously；
Then whole pressure measurement valves 13 is opened, monitoring computer 12 is the number pressure fed back to each pressure sensor 11
Value carries out interval statistics and records；
After 7 days saturations, the numerical value of all pressure sensors 11 rises to 1.8MPa from OMPa, then keeps pressure maintaining valve
Simultaneously the extraction pressure of vacuum pump 14 is arranged as -13KPa in the open state of door 9, and three-way valve 10 is rotatably connected to vacuum pump 14
Vacuum pump 14 is opened afterwards carries out simulation extraction；
Control monitoring computer 12 counted every 24 hours and records the number pressure that primary each pressure sensor 11 is fed back
Value, the pressure value for reaching each pressure sensor 11 after scheduled extraction number of days (30 days) is as shown in the table,
| Serial number | Distance d (cm) | Pressure p (MPa) |
| 1 | 0 | -0.013 |
| 2 | 10 | 0.18 |
| 3 | 50 | 0.55 |
| 4 | 90 | 0.9 |
| 5 | 130 | 1.18 |
| 6 | 170 | 1.41 |
| 7 | 210 | 1.56 |
| 8 | 250 | 1.68 |
| 9 | 290 | 1.75 |
| 10 | 300 | 1.8 |
The pressure value of each pressure sensor 11 is fitted by monitoring computer 12 according to plug-in with exponential function, such as
Shown in Fig. 2, exponential function formula is p=1.8-0.184ed/110, p is gas pressure, and d is the distance apart from pressure stabilizing end；This time survey
Surely think that 30 days gas pressures drop to 50% (0.9MPa) of original gas pressure, obtain function formula after substituting into fitting, ask
The gas drainage radius of influence that coal seam must be corresponded to is 0.81m.
In order to realize the automatic operation of continuous mode, as a further improvement of the present invention, controlling valve 9, three
Port valve door 10 and pressure measurement valve 13 are solenoid electric valves, controlling valve 9, three-way valve 10 and pressure measurement valve 13 respectively with monitoring
Computer 12 is electrically connected, and the automatic open close of each valve may be implemented by controlling monitoring computer 12.
Effect, as a further improvement of the present invention, polytetrafluoro are sealed up for safekeeping in order to realize that coal core sample 1 is preferably closed
Ethylene sealing ring 5 is the small pyramidal structure of outer imperial palace, and the inner end of plug 6 is arranged to the taper with teflin ring 5
The cone structure of structure cooperation.
Claims (10)
1. a kind of measurement device of the effective radius of influence of mash gas pumping drilling, which is characterized in that infused including coal core clamper, gas
Enter part, gas simulation extraction part and pressure test part；
The coal core clamper includes cylinder (2), plug (6) and ring packing pad assembly；Cylinder (2) is cylindrical structure, cylinder
Type structure is pressure stabilizing end (15) and negative pressure end (16) along the both ends of its axial direction, along its axis on the cartridge type outer surface of cylindrical structure
Multiple pressure taps being uniformly arranged are equipped with to direction, pressure tap runs through the barrel of cylindrical structure along the radial direction of cylindrical structure；
Plug (6) is set as two pieces, and two pieces plug (6) seals be fixedly mounted on pressure stabilizing end (15) and negative pressure end (16) respectively, plug
(6) the gas access way through plug (6) is equipped with along its axial direction；Ring packing pad assembly corresponds to the number of plug (6)
Amount is set as two sets, and ring packing pad assembly is arranged in end of the plug (6) towards cylinder (2) inner cavity；
The gas injection unit, which sets up separately, is set to two sets, and two sets of gas injection parts respectively correspond pressure stabilizing end (15) and negative pressure end
(16) it is arranged, gas injection unit point includes gas pressure gas cylinder (7), corresponds to the defeated of the gas pressure gas cylinder (7) of pressure stabilizing end (15)
Outlet is connect by controlling valve (9) with the gas access way for the plug (6) being located on pressure stabilizing end (15), corresponding negative pressure end
(16) watt that the delivery outlet of gas pressure gas cylinder (7) passes through three-way valve (10) and the plug (6) being located on negative pressure end (16)
The connection of this access way；
The gas simulation extraction part includes vacuum pump (14), another access peace of vacuum pump (14) and three-way valve (10)
Load connects；
The pressure test part includes pressure sensor (11) and monitoring computer (12)；Pressure sensor (11) corresponds to cylinder
The quantity of the pressure tap of body (2) is arranged, and the pressure input of pressure sensor (11) passes through pressure measurement valve (13) and cylinder (2)
Pressure tap connection, multiple pressure sensors (11) are electrically connected with monitoring computer (12) respectively.
2. the measurement device of the effective radius of influence of mash gas pumping drilling according to claim 1, which is characterized in that gas note
Entering part further includes constant pressure delivery pump (8), the input terminal and output end of the constant pressure delivery pump (8) of corresponding pressure stabilizing end (15) respectively with
Gas pressure gas cylinder (7) and controlling valve (9) connection of corresponding pressure stabilizing end (15), the constant pressure delivery pump of corresponding negative pressure end (16)
(8) input terminal and output end is connected with the gas pressure gas cylinder (7) of corresponding negative pressure end (16) and three-way valve (10) respectively.
3. the measurement device of the effective radius of influence of mash gas pumping drilling according to claim 1 or 2, which is characterized in that steady
Pressure valve (9), three-way valve (10) and pressure measurement valve (13) are solenoid electric valves, controlling valve (9), three-way valve (10) and
Pressure measurement valve (13) is electrically connected with monitoring computer (12) respectively.
4. the measurement device of the effective radius of influence of mash gas pumping drilling according to claim 1 or 2, which is characterized in that ring
Shape seal pad assembly be combination sealing mat structure, including set gradually from inside to outside rubber washer (3), copper gasket (4) and gather
Tetrafluoroethene sealing ring (5).
5. the measurement device of the effective radius of influence of mash gas pumping drilling according to claim 3, which is characterized in that polytetrafluoro
Ethylene sealing ring (5) is the small pyramidal structure of outer imperial palace, and the inner end of plug (6) is arranged to and teflin ring (5)
Pyramidal structure cooperation cone structure.
6. the measurement device of the effective radius of influence of mash gas pumping drilling according to claim 1 or 2, which is characterized in that survey
The quantity of pressure mouth is no less than 5.
7. a kind of measuring method of the effective radius of influence of mash gas pumping drilling, which comprises the following steps:
A. in the region of the gas drainage radius of influence to be determined, gas pressure measurement drilling of constructing measures primitive coalbed gas pressure
Power simultaneously records；
B. the region this coal seam or wear a layer coring of constructing and drill and take out coal core sample (1), by coal core sample (1) dress
In the coal core clamper for entering the measurement device of the effective radius of influence of mash gas pumping drilling, and pass through ring packing pad assembly and plug
(6) carrying out strong fix will be packaged with after the gas access way of closure plug (6) carries out closed seal up for safekeeping to coal core sample (1)
The cylinder (2) of coal core sample (1) is transported to ground experiment room；
C. cylinder (2) and the gas injection part, gas simulation extraction part and pressure test portion of coal core sample (1) will be packaged with
Divide installation connection, the level pressure output pressure for then adjusting constant pressure delivery pump (8) is primitive coalbed gas pressure and opens gas pressure
Strength bottle (7), then successively opens the constant pressure delivery pump (8) and controlling valve (9) of corresponding pressure stabilizing end (15), and controls triple valve
Door (10) makes the constant pressure delivery pump (8) of corresponding negative pressure end (16) and the gas access way of the plug (6) of corresponding negative pressure end (16)
Connection, methane gas inject coal core sample (1) simultaneously from cylinder (2) both ends；
D. it opens whole pressure measurement valves (13), the pressure value that monitoring computer (12) feeds back each pressure sensor (11)
It is counted and is recorded, the unlatching of controlling valve (9) is kept when the numerical value of pressure sensor reaches the original gas pressure in coal seam
State, be arranged three-way valve (10) after the extraction pressure of vacuum pump (14) make the vacuum pump (14) of corresponding negative pressure end (16) with it is corresponding
The gas access way of the plug (6) at negative pressure end (16) is connected to, and is opened vacuum pump (14) and is carried out simulation extraction；
E. control monitoring computer (12) intermittently counts and records the pressure value of each pressure sensor (11) feedback, until reaching
To scheduled extraction number of days；
F. the pressure value of each pressure sensor (11) is fitted by monitoring computer (12) according to plug-in with exponential function,
Then pressure value needed for being up to the extraction radius of influence obtains function formula after bringing fitting into, acquires the gas of primitive coalbed
The extraction radius of influence.
8. the measuring method of the effective radius of influence of mash gas pumping drilling according to claim 7, which is characterized in that step a
The drilling of middle gas pressure measurement is at least constructed and measures primitive coalbed gas pressure to gas pressure measurement drilling respectively by two,
The level pressure output pressure of constant pressure delivery pump (8) is adjusted in step c as the maximum value in primitive coalbed gas pressure value.
9. the measuring method of the effective radius of influence of mash gas pumping drilling according to claim 7, which is characterized in that step b
The length of middle coal core sample (1) is not less than 3m, and the end face of coal core sample (1) polishes flat.
10. the measuring method of the effective radius of influence of mash gas pumping drilling according to claim 7, which is characterized in that step b
Middle coal core sample (1) is monolith integral structure or the structure that is collectively constituted by the sample section of several different lengths, and coal core is tried
The end face of sample (1) or sample section polishes flat.
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