CN108732329A - A kind of determination of coal seam gas pressure analog simulation experimental device and method - Google Patents
A kind of determination of coal seam gas pressure analog simulation experimental device and method Download PDFInfo
- Publication number
- CN108732329A CN108732329A CN201810497957.XA CN201810497957A CN108732329A CN 108732329 A CN108732329 A CN 108732329A CN 201810497957 A CN201810497957 A CN 201810497957A CN 108732329 A CN108732329 A CN 108732329A
- Authority
- CN
- China
- Prior art keywords
- pressure
- gas
- coal sample
- simulation
- tank
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Food Science & Technology (AREA)
- Analytical Chemistry (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Medicinal Chemistry (AREA)
- Physics & Mathematics (AREA)
- Remote Sensing (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The present invention relates to similar simulation experimental methods, more particularly to a kind of determination of coal seam gas pressure analog simulation experimental device and method, including coal sample tank, high-pressure nitrogen bottle, delivery pipe and gas pressure sensor, coal sample tank includes tank body, sealing cover, air inlet, gas outlet and simulation drill pipe, it simulates drill pipe and is vertically set to center in the tank body, and its bottom and tank body inner bottom surface are affixed, top passes through and exposes to the sealing cover；Simulation drill pipe surface offers multiple simulation drillings；High-pressure nitrogen bottle is connect by delivery pipe with the air inlet of the coal sample tank, and gas pressure sensor is connect with the gas outlet of the coal sample tank.The determination of coal seam gas pressure analog simulation experimental device and method, it is simple in structure, demonstrate chamber volume is smaller, pressure balance time it is faster this imagination, operating process is easy, the verification time is short, experimental result is reliable, can solve the problems such as underground coal mine experimental period is long, achievement is difficult to intuitively embody.
Description
Technical field
The present invention relates to a kind of similar simulation experimental methods, and in particular to a kind of determination of coal seam gas pressure analog simulation is real
Experiment device and method.
Background technology
Gas is the product of incoalation, since the presence of Van der Waals power makes the methane gas in coal be inhaled in the form of molecule
It invests on coal body surface.Gas contained in coal is divided into adsorption gas, free gas and micro dissolving gas.Gas
Pressure is the product that free gas moves, in the case where coal seam is not adopted or other are acted on, free gas
It is present in hole larger in coal body and crack, and dynamic balance state is in adsorption gas.When coal seam by digging,
In the case of extraction and artificial release, adsorption-desorption state reaches equilibrium state with underground atmospheric pressure again, and direct method is surveyed
Determine exactly this process that gas pressure utilizes.Have between gas pressure, free gas content and adsorption gas content certain
Inner link.
When underground utilizes Direct Determination gas pressure, has following physical phenomenon and occur：When the non-sealing of hole of drilling, entirely
Desorption of mash gas diffusing capacity in drilling can be much larger than desorption of mash gas diffusing capacity in sealing of hole metapore bottom pressure measurement gas chamber, but bottom hole pressure measurement
The time that the indoor gas concentration of gas reaches peak value after sealing of hole can reach time of peak value far faster than the non-sealing of hole of drilling.At present
For according to the phenomenon, the relevant personnel propose the desirability about gas pressure equilibration time and pressure measurement chamber volume it is assumed that i.e.
Pressure measurement chamber volume is smaller, and gas pressure equilibration time is shorter.But it is drilled field measurement not only quantities using coal mine
Greatly, and by various physical conditions it is influenced so that institute's measuring pressure is inaccurate, it is difficult to reach verification the verifying results.
Invention content
The present invention in order to solve the above-mentioned technical problem, provide a kind of determination of coal seam gas pressure analog simulation experimental device and
Method.
In a first aspect, the present invention provides a kind of determination of coal seam gas pressure analog simulation experimental device, including coal sample tank,
High-pressure nitrogen bottle, delivery pipe and gas pressure sensor, the coal sample tank include tank body, sealing cover, air inlet, gas outlet and mould
Quasi- drill pipe, the sealing cover are set to the tank body open top, and the air inlet is opened in the sealing cover, the simulation
Drill pipe is vertically set to center in the tank body, and its bottom and tank body inner bottom surface are affixed, and top passes through and exposes to institute
State sealing cover；The simulation drill pipe surface offers multiple simulation drillings；The high-pressure nitrogen bottle passes through delivery pipe and institute
The air inlet connection of coal sample tank is stated, the gas pressure sensor is connect with the gas outlet of the coal sample tank.
Further, the tank body is tubbiness, and both sides opposite on its outer wall are connected with knob；The sealing cover is circle
Shape which is provided with draw ring.
Preferably, the aperture of the air admission hole is 5mm-10mm.
Preferably, a diameter of 2cm of the simulation drilling.
It is 35cm that the simulation drill pipe, which is located at the length in the tank body,.
Another aspect of the present invention provides a kind of using above-mentioned determination of coal seam gas pressure analog simulation experimental device
Method includes the following steps：
(1) it connects and debugs each instrument and ensure each instrument and equipment well operation and coal sample tank air-tightness；
(the 2 initial similar states of simulation so that the gas pressure in coal sample tank remains stable pressure value, and gas into
Enter pressure measurement gas chamber and meet the desorption of coal-bed gas to gush out Diffusion Law；
(3) slack tank simulated pressure is tested, and under the conditions of not coalingging in coal sample tank, data is recorded in experimentation, are obtained respectively
The relationship of the equilibration time and pressure measurement chamber volume of multigroup gas pressure value；
(4) original mold pseudopressure of coalingging is tested, and under conditions of filling coal in coal sample tank, data are recorded in experimentation, respectively
Obtain the relationship of the equilibration time and pressure measurement chamber volume of multigroup gas pressure value.
Preferably, the step (1) includes coal sample tank performing leak test, specially：
Instrument and equipment is connected, without being packed into coal sample in coal sample tank；
Suds are coated in the junction of air inlet, gas outlet and the tank body and sealing cover of coal sample tank；
Gas pressure sensor is connect with gas outlet, high-pressure nitrogen bottle is opened and is inflated into coal sample tank so that gas injection pressure
Power reaches certain value；
Each easy air leak position is observed, if bubble-free generates and gas pressure sensor display reading is filled with high-pressure nitrogen bottle
Atmospheric pressure is identical, then illustrates that coal sample tank air-tightness is good.
Preferably, the initial similar state concrete operations of simulation are in the step (2)：
1) high-pressure nitrogen bottle connects the air inlet of coal sample tank by gas injection sebific duct, and there are holes for junction；
2) simulation coal seam pressure is certain value A, according to pressure value gas injection into coal sample tank of A+0.12MPa, by certain
After time, the gas pressure in coal sample tank remains within the scope of A ± 0.005Mpa；
3) simulation drilling is handled, processing method is：Cloth polyester fiber packet is being simulated into drill pipe outer surface,
Then swabbing is pasted on cloth, is continued with cloth bag in its outer layer, last layer is tightly wrapped cloth in simulation drill pipe with nylon cable tie
On road, and cotton is inserted in drilling, prevent having coal ash to enter gas pressure sensor during pressure measurement.
Preferably, step (3) slack tank simulated pressure test the specific steps are：
1) gas of coal sample tank is slowly released from air inlet, after all gas is released, in tank gas pressure state with it is big
Atmospheric pressure is identical, is 0MPa；
2) experiment for carrying out three groups of pressure values, is 0.1MPa, 0.3MPa and 0.5MPa respectively, repeatedly carries out entirely pneumatic put
Gas is tested, and record inflates the time of needs when reaching target pressure value into coal sample tank each time, finally averages, obtains
Required time；
3) gas pressure sensor is removed at the top of the simulation drill pipe of coal sample tank, simulation drill pipe is blocked with plug
Outlet at the top of road obtains the uniform charge time according to step 2) and is inflated, after inflation, removes plug, pressure is passed
Sensor is promptly tightened in simulation drilling, and record observation sensor reaches the time used in each pressure value；Change simulation drilling
The volume of pressure measurement gas chamber, it is required according to each pressure value is reached under the different pressure measurement chamber volumes of above method test of the step
Time；
4) relational graph of gas pressure balancing time and pressure measurement chamber volume are drawn according to the data that above step obtains, and
The relationship of gas pressure balancing time and pressure measurement chamber volume are obtained after analysis.
Further, change the method for pressure measurement chamber volume in the step 3) of step (3) the slack tank simulated pressure test
For：A wax oil for lighted candle outflow is instilled into drilling, after a duck eye ventilation will be worn in the wax oil of solidification；In coal sample tank
The length for simulating drill pipe is respectively 30cm, 20cm, 10cm, 5cm, 2cm, 1cm, and corresponding pressure measurement chamber volume is respectively
94.2cm3、62.8cm3、31.4cm3、15.7cm3、6.28cm3、3.14cm3, five simulation surveys of each pressure measurement chamber volume progress
Pressure.
Further, the step (4) coaling original mold pseudopressure test the specific steps are：
1) coal sample is packed into coal sample tank, after being packed into coal sample, seal cap sealing is open in top of the tank：
2) experiment for carrying out three groups of pressure values, is 0.1MPa, 0.3MPa and 0.5MPa respectively, repeatedly carries out entirely pneumatic put
Gas is tested, and record inflates the time of needs when reaching target pressure value into coal sample tank each time, finally averages, obtains
Required time；
3) gas pressure sensor is removed at the top of the simulation drill pipe of coal sample tank, simulation drill pipe is blocked with plug
Outlet at the top of road obtains the uniform charge time according to step 2) and is inflated, after inflation, removes plug, pressure is passed
Sensor is promptly tightened in simulation drilling, and record observation sensor reaches the time used in each pressure value；Change simulation drilling
The volume of pressure measurement gas chamber, it is required according to each pressure value is reached under the different pressure measurement chamber volumes of above method test of the step
Time；
4) relational graph of gas pressure balancing time and pressure measurement chamber volume are drawn according to the data that above step obtains, and
The relationship of gas pressure balancing time and pressure measurement chamber volume are obtained after analysis.
Further, the step (4) -1) in the step of sample enters coal sample tank of coalingging be specially：Bottom is first spread into grain size
Coal sample less than 1mm, then paving grain size is 1mm-3mm coal samples layer, grain size is 3mm-5mm coal sample layers successively upwards, then by three kinds
The coal sample mixing of grain size is packed into, and the coal sample that grain size is 3mm-5mm is finally layered on top layer.
Using above-mentioned technical proposal, including following advantageous effect：A kind of determination of coal seam gas pressure provided by the present invention
Analog simulation experimental device and method, it is simple in structure, demonstrate chamber volume is smaller, pressure balance time it is faster this imagination,
Operating process is easy, the verification time is short, experimental result is reliable, can solve underground coal mine length experimental period, achievement is difficult to intuitively
The problems such as embodiment.
Description of the drawings
Fig. 1 is provided the structural schematic diagram of determination of coal seam gas pressure analog simulation experimental device by the embodiment of the present invention；
Fig. 2 is that pressure value 0.1MPa does not coaling pressure measurement chamber volume and gas balance time chart；
Fig. 3 is that pressure value 0.3MPa does not coaling pressure measurement chamber volume and gas balance time chart；
Fig. 4 is that pressure value 0.5MPa does not coaling pressure measurement chamber volume and gas balance time chart；
Fig. 5 is that pressure value 0.1MPa coalings pressure measurement chamber volume and gas balance time chart；
Fig. 6 is that pressure value 0.31MPa coalings pressure measurement chamber volume and gas balance time chart；
Fig. 7 is that pressure value 0.31MPa coalings pressure measurement chamber volume and gas balance time chart
In figure,
1, high-pressure nitrogen bottle；2, delivery pipe；3, coal sample tank；3.1, tank body；3.2, sealing cover；3.3, air inlet；3.4, go out
Gas port；4, gas pressure sensor；5, drill pipe is simulated；6, coal sample.
Specific implementation mode
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached in the embodiment of the present invention
Figure, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is the present invention
A part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not having
The every other embodiment obtained under the premise of creative work is made, shall fall within the protection scope of the present invention.
In the present invention, term "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outside",
" in ", "vertical", "horizontal", " transverse direction ", the orientation or positional relationship of the instructions such as " longitudinal direction " be orientation based on ... shown in the drawings or
Position relationship.These terms are not intended to limit indicated dress primarily to preferably describe the present invention and embodiment
It sets, element or component must have particular orientation, or be constructed and operated with particular orientation.
Also, above-mentioned part term is other than it can be used to indicate that orientation or positional relationship, it is also possible to for indicating it
His meaning, such as term "upper" also are likely used for indicating certain relations of dependence or connection relation in some cases.For ability
For the those of ordinary skill of domain, the concrete meaning of these terms in the present invention can be understood as the case may be.
In addition, term " installation ", " setting ", " being equipped with ", " connection ", " connected " " socket " shall be understood in a broad sense.For example, can
To be to be fixedly connected, it is detachably connected or monolithic construction；Can be mechanical connection, or electrical connection；It can be directly connected,
Either indirectly connected through an intermediary, or it is two connections internal between device, element or component.For
For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
Unless otherwise indicated, the meaning of " multiple " is two or more.
It is described in further detail below by specific embodiment and in conjunction with attached drawing to the present invention.
Embodiment：
When underground utilizes Direct Determination gas pressure, has following physical phenomenon and occur：When the non-sealing of hole of drilling, entirely
Desorption of mash gas diffusing capacity in drilling can be much larger than desorption of mash gas diffusing capacity in sealing of hole metapore bottom pressure measurement gas chamber, but bottom hole pressure measurement
The time that the indoor gas concentration of gas reaches peak value after sealing of hole can reach time of peak value far faster than the non-sealing of hole of drilling.According to
The phenomenon proposes about gas pressure equilibration time and pressure measurement chamber volume it is assumed that i.e. pressure measurement chamber volume is smaller, gas pressure
The dynamic balance time is shorter, is designed according to this hypothesis and is verified using similarity simulation experiment.
By the method for physical simulation, the main research of this similarity simulation experiment is：Gas pressure measurement
Equilibration time and pressure measurement chamber volume relationship research.
Similarity simulation experiment is based on the theory of similarity, the laboratory procedure of condition of similarity, which has behaviour
Make the features such as process is easy, the verification time is short, experimental result is reliable, is that can solve underground coal mine length experimental period, achievement hardly possible
The most efficient method of the problems such as intuitively to embody.Similarity simulation experiment need to meet geometric similarity, kinematic similitude, dynamic similarity,
Several conditions such as original state is similar and boundary condition is similar.The experiment of simulated determination gas pressure balance is different from being related to coal mine
Mechanics similarity simulation experiment is exploited, mainly meets geometric similarity two conditions similar to original state, below to the two
Condition of similarity is introduced.
One, geometric similarity condition
Geometric similarity is the primary condition of entire physical simulation model, must be requested that model and physical geometry phase
Seemingly, therefore, the model of design must carry out a degree of zoom in or out according to the size of master mould.With the long L of model
For, LM is the length of mold, and LH is the length of material object, and α L are the ratio of LM and LH, also commonly referred to as than ruler, geometric proportion ruler item
Part is：
Generally, the model done is bigger, closer to prototype, can preferably react underground coal mine actual conditions, but by
It is limited in various aspects condition, prototype proportionally must be reduced to obtain by done model, the mould of this experiment analog simulation
Type is the pressure measurement gas chamber of drilling, between the value according to Roadway model α L is 50~100.So the length of simulation drilling is coal mine
Down-hole drilling length
Two, original state is similar
It refers to model and the nature of prototype that so-called original state is similar should keep phase as far as possible during the experiment
Seemingly.The original state to be kept in this simulated experiment is similar at 2 points, and first point is answered always for the gas pressure in model
Keep stable pressure value, second point is that gas enters pressure measurement gas chamber and should meet the parsing of coal-bed gas and gushes out Diffusion Law.Behaviour
It is to change air inflow and simulation drilling is further processed to make method, and specific operation process experimental procedure is discussed in detail.
By research contents before it is found that after Direct Determination gas pressure pore-forming, the desorption of mash gas in coal seam is diffused into
Gas pressure is generated in pressure measurement gas chamber, pressure balance time derives：
Balance model pressure difference is：
In formula, PAO, PBO are respectively the initial pressure of pressure measurement gas chamber in sealing coal sample tank and simulation drilling；PA, PB distinguish
For the pressure of a certain moment coal sample tank and pressure measurement gas chamber in equilibrium process.
Flow from coal sample tank to pressure measurement gas chamber is：
Conductance is：
That is VAdpA=-U (pA-pB)dt (4-4)
Gas in gas cylinder and pressure measurement gas chamber regards perfect gas as, applies perfect condition equation respectively：
Subtracting (4-6) with (4-5) can obtain
Assuming that gas cylinder and gas pressure gas chamber and between the pipeline gas leakage that is connected to ignore, then two gas
The gas gross mass of room is constant.
Bring formula (4-8) into formula (4-7)
Again because of RTdmA=VAdpA, bring formula (4-9) into
Formula (4-4) is substituted into formula (4-10)
Formula (4-11) is integrated
Arrange to obtain formula 4-13
It can be obtained by formula 4-13, the trend of gas balance time is that VB is smaller, and equilibration time is faster.
The present embodiment verifies the correctness of the derivation of equation by similarity simulation experiment below：
A kind of determination of coal seam gas pressure analog simulation experimental device is present embodiments provided, refering to fig. 1, including coal sample tank
3, high-pressure nitrogen bottle 1, delivery pipe 2 and gas pressure sensor 4, the coal sample tank 3 include tank body 3.1, sealing cover 3.2, air inlet
Mouth 3.3, gas outlet 3.3 and simulation drill pipe 5, the sealing cover 3.2 are set to the tank body open top, and the air inlet is opened
Set on the sealing cover, the simulation drill pipe is vertically set to center in the tank body, and its bottom and tank body inner bottom surface are solid
It connects, top passes through and exposes to the sealing cover；The simulation drill pipe surface offers multiple simulation drillings 5.1；Institute
It states high-pressure nitrogen bottle 1 to connect with the air inlet of the coal sample tank 3 by delivery pipe 2, the gas pressure sensor and the coal
The gas outlet of sample tank connects.
Tank body described in the present embodiment is tubbiness, tank design parameter：High 30cm, diameter 30cm, wall thickness 2.5mm, weight
For 65kg, opposite both sides are connected with knob (not shown) on tank body and its outer wall；
The sealing cover is circle, which is provided with draw ring (not shown).Top of the tank is reinforced with screw, logical when fractionation
Cross top draw ring pull-up.Coal sample tank is equipped with air admission hole and venthole, and air admission hole aperture is 5mm, has simulation drill pipe in coal sample tank
Road, Direct Determination gas pressure pressure measuring drill hole length are generally 30-35m, so the simulation drill pipe in tank body is set
Meter length is 35cm, simulates and is also connected with gas pressure sensor on the gas outlet at the top of drill pipe.
On the other hand the present embodiment provides a kind of using above-mentioned determination of coal seam gas pressure analog simulation experimental device
Method, include the following steps：
S1, connection simultaneously debug each instrument and ensure each instrument and equipment well operation and coal sample tank air-tightness；
High-pressure nitrogen bottle is connect as air source, by rubber tube with coal sample canister incoming gas mouth, is inflated into coal sample tank, coal sample tank
Gas outlet connects pressure sensor and carries out commissioning device and measure gas pressure
Experiment selects HH316 Pressure of Ambient Temperature sensors, the pressure sensor to use diffusion silicon for pressure cell, and HH316 is normal
Temperature and pressure force snesor is applied widely to carry out pressure accurately measurement and pick-up for liquid, gas, steam.HH316 room temperature pressures
Force snesor has the advantages of mechanical protection rank reaches IP65 and also explosive-proof protector, more preferable compared with other pressure sensors
Be suitable for coal bed pressure measurement.The power supply of this experiment adaptation gas pressure sensor is that 220v alternating currents turn 24v DC power supplies
The step further includes coal sample tank performing leak test, specially：
Instrument and equipment is connected, without being packed into coal sample in coal sample tank；
Suds are coated in the junction of air inlet, gas outlet and the tank body and sealing cover of coal sample tank；
Gas pressure sensor is connect with gas outlet, high-pressure nitrogen bottle is opened and is inflated into coal sample tank so that gas injection pressure
Power reaches certain value, such as 0.1MP；
Each easy air leak position is observed, if bubble-free generates and gas pressure sensor display reading is filled with high-pressure nitrogen bottle
Atmospheric pressure is identical, then illustrates that coal sample tank air-tightness is good.
S2, the initial similar state of simulation make the gas pressure in coal sample tank remain stable pressure value, and gas
Diffusion Law is gushed out in the desorption for meeting coal-bed gas into pressure measurement gas chamber；
The similar 2 points of requirements of original state of this similarity simulation experiment, first, the gas pressure in coal sample tank should be kept always
Stable pressure value should meet the desorption of coal-bed gas and gush out Diffusion Law second is that gas enters pressure measurement gas chamber.For above two
Point requires, and carries out following experimental implementation：
1) high-pressure nitrogen bottle connects the air inlet of coal sample tank by gas injection sebific duct, and there are holes for junction
Gap；Because coal sample tank volume is limited, and tank body air-tightness is good, if with the certain pressure gas injection into tank always,
Then pressure inside the tank constantly rises, and cannot keep constant.So when gas injection sebific duct being made to be connected to air admission hole in operation, need to stay
Go out certain hole, institute's gas injection body part needs to reveal
2) simulation coal seam pressure is certain value A, according to pressure value gas injection into coal sample tank of A+0.12MPa, by certain
After time, the gas pressure in coal sample tank remains within the scope of A ± 0.005Mpa；
If this experimental simulation coal seam pressure is 0.1MPa, according to 0.12MPa into coal sample tank when gas injection, when by one section
Between after, the gas pressure in coal sample tank remains at 0.1MPa or so, and error is no more than 0.005MPa, in allowable error range
Within, meet this similar condition of original state of analog simulation, other pressure values are also with this method.It can using this method
Not close the valve on gas cylinder, and the gas pressure in coal sample tank is made to be in a stable pressure value always.
3) simulation drilling is handled, processing method is：Cloth polyester fiber packet is being simulated into drill pipe outer surface,
Then swabbing is pasted on cloth, is continued with cloth bag in its outer layer, last layer is tightly wrapped cloth in simulation drill pipe with nylon cable tie
On road, and cotton is inserted in drilling, prevent having coal ash to enter gas pressure sensor during pressure measurement.
Gas pressure in pressure measurement gas chamber is not to reach balance moment, is that the free gas experience certain time in coal seam is logical
Cross desorption, the dynamic equilibrium that diffusion motion reaches.The presbyopia simulation drilling of coal sample tank design is because directly ventilative, so being surveyed in simulation
During pressure, air chamber pressure value quickly reaches equilibrium valve, can not simulate practical pressure measurement rule.So to simulation drilling
Reason, processing method are：Prepare several blocks of poor cloth of gas permeability such as polyester fibers, takes one layer of packet in drilling, then in cloth
Upper swabbing paste, continues to be drilled with cloth bag, last layer is tightly wrapped gauze in simulation drilling with nylon cable tie, and in drilling
Cotton is inserted, prevents having coal ash to enter pressure sensor during pressure measurement.
S3, slack tank simulated pressure are tested, and under the conditions of not coalingging in coal sample tank, data are recorded in experimentation, are obtained respectively
The relationship of the equilibration time and pressure measurement chamber volume of multigroup gas pressure value；
The contrast experiment that variable in order to control is tested in pressure measurement is simulated, experimental variable is the pressure measurement chamber volume in simulation drilling.
In order to the problem of discovery as far as possible in the presence of experiment and ensure being smoothed out for experiment, this experiment first passes through not to coal sample
Simulated pressure of progress of coalingging in tank is tested.
Slack tank simulated pressure test the specific steps are：
1) gas of coal sample tank is slowly released from air inlet, after all gas is released, in tank gas pressure state with it is big
Atmospheric pressure is identical, is 0MPa；
2) experiment for carrying out three groups of pressure values, is 0.1MPa, 0.3MPa and 0.5MPa respectively, in order to coal reported as precisely as possible
Gas pressure is constant in sample tank reaches the required inflationtime of each pressure value, repeatedly carries out entirely pneumatic deflation experiment, record
The time of needs, finally averages when into coal sample tank, inflation reaches target pressure value each time, the time required to obtaining；It is real
It tests data and is shown in Table 4-1.
Table 4-1 does not coaling inflationtime record sheet
3) gas pressure sensor is removed at the top of the simulation drill pipe of coal sample tank, simulation drill pipe is blocked with plug
Outlet at the top of road obtains the uniform charge time according to step 2) and is inflated, after inflation, removes plug, pressure is passed
Sensor is promptly tightened in simulation drilling, and record observation sensor reaches the time used in each pressure value；Change simulation drilling
The volume of pressure measurement gas chamber, it is required according to each pressure value is reached under the different pressure measurement chamber volumes of above method test of the step
Time；
Wherein, the method for change pressure measurement chamber volume is：A wax oil for lighted candle outflow is instilled into drilling, after by solidification
A duck eye ventilation is worn in wax oil；The length of simulation drill pipe in coal sample tank be respectively 30cm, 20cm, 10cm,
5cm, 2cm, 1cm, corresponding pressure measurement chamber volume is respectively 94.2cm3、62.8cm3、31.4cm3、15.7cm3、6.28cm3、
3.14cm3, five simulation pressure measurement of each pressure measurement chamber volume progress.
4) relational graph of gas pressure balancing time and pressure measurement chamber volume are drawn according to the data that above step obtains, and
The relationship of gas pressure balancing time and pressure measurement chamber volume are obtained after analysis.
By above three step, data are recorded and analyzed, completion coal sample tank, which is not coaling, simulates the experiment of gas pressure measurement.
Record experimental data, table 4-3 be pressure value 0.1MPa without coal gas body equilibration time record sheet, according in table
Data draw the relational graph of gas pressure balancing time and pressure measurement chamber volume, refering to Fig. 2.
Table 4-3 does not coaling equilibration time record sheet
Table 4-4 is pressure value 0.3MPa without coal gas body equilibration time record sheet, and gas is drawn according to the data in table
The relational graph of pressure balance time and pressure measurement chamber volume, refering to Fig. 3.
Table 4-4 does not coaling equilibration time record sheet
Table 4-5 is pressure value 0.5MPa without coal gas body equilibration time record sheet, and gas is drawn according to the data in table
The relational graph of pressure balance time and pressure measurement chamber volume, refering to Fig. 4.
Table 4-5 does not coaling equilibration time record sheet
S4, original mold pseudopressure of coalingging are tested, and under conditions of filling coal in coal sample tank, data are recorded in experimentation, respectively
Obtain the relationship of the equilibration time and pressure measurement chamber volume of multigroup gas pressure value.
1) coal sample is packed into coal sample tank, after being packed into coal sample, seal cap sealing is open in top of the tank：
To ensure that this experiment can achieve the effect that simulate determination of coal seam gas pressure, select that stockaded village precipice ground coal mine is fresh adopts
The coal sample of collection is handled, and processing method is to smash coal sample to be screened with standard screen, and coal sample prepares being divided into three classes for grain size,
The coal sample 2Kg of the coal sample 2Kg, 1mm-3mm of respectively 3mm-5mm are less than the coal sample 2Kg of 1mm, when coal sample is packed into sealing coal sample tank
The coal sample in three kinds of apertures need to be mixed, it is ensured that coal body pore structure is close to primitive coalbed.
Further, the step (4) -1) in the step of sample enters coal sample tank of coalingging be specially：Bottom is first spread into grain size
Coal sample less than 1mm, then paving grain size is 1mm-3mm coal samples layer, grain size is 3mm-5mm coal sample layers successively upwards, then by three kinds
The coal sample mixing of grain size is packed into, and the coal sample that grain size is 3mm-5mm is finally layered on top layer.
2) experiment for carrying out three groups of pressure values, is 0.1MPa, 0.3MPa and 0.5MPa respectively, repeatedly carries out entirely pneumatic put
Gas is tested, and record inflates the time of needs when reaching target pressure value into coal sample tank each time, finally averages, obtains
Required time；
3) gas pressure sensor is removed at the top of the simulation drill pipe of coal sample tank, simulation drill pipe is blocked with plug
Outlet at the top of road obtains the uniform charge time according to step 2) and is inflated, after inflation, removes plug, pressure is passed
Sensor is promptly tightened in simulation drilling, and record observation sensor reaches the time used in each pressure value；Change simulation drilling
The volume of pressure measurement gas chamber, it is required according to each pressure value is reached under the different pressure measurement chamber volumes of above method test of the step
Time；
4) relational graph of gas pressure balancing time and pressure measurement chamber volume are drawn according to the data that above step obtains, and
The relationship of gas pressure balancing time and pressure measurement chamber volume are obtained after analysis.
The data obtained in experimentation are recorded, analysis experimental result is prepared.
The pressure balance time data of different pressure measurement chamber volume gases, obtain table 4-6 under the conditions of the record canned coal of coal sample,
According to list data, the relational graph of gas pressure balancing time and pressure measurement chamber volume are drawn, sees Fig. 5.
Table 4-6 coalings gas balance time sheet
Table 4-7 is that pressure value 0.3MPa coalings gas balance time sheet, and gas pressure is drawn according to the data in table
The relational graph of dynamic balance time and pressure measurement chamber volume, refering to Fig. 6.
Table 4-7 coalings gas balance time sheet
Table 4-8 is that pressure value 0.5MPa coalings gas balance time sheet, and gas pressure is drawn according to the data in table
The relational graph of dynamic balance time and pressure measurement chamber volume, refering to Fig. 7.
Table 4-8 coalings gas balance time sheet
By the analysis to pressure measurement chamber volume and the relational graph of gas balance time, can be obtained to draw a conclusion：
(1) in the relationship from the volume of pressure measurement gas chamber with the gas balance time, no matter whether coal sample tank coalings, gas chamber
Volume is smaller, and the time that gas reaches balance is shorter, demonstrates imaginary correctness proposed in this chapter general introductions；
(2) it can be reasoned out in practical sealing of hole by similarity simulation experiment result, pressure measurement air chamber length is less than two meters, gas
Pressure balance time is most fast；
(3) equilibration time reduces with chamber volume and shortens non-linear relation, all figure midpoints 6 to 5 time shortening amounts of point
It is very small, when gas pressure is surveyed in underground underground, cause gas chamber long if sealing of hole distance is too short, the pressure measurement period is much super
The normal equilibrium time is spent, and easily pressure measurement fails, this similarity simulation experiment has been also demonstrated that two-stage sealing of hole exists from another point of view
The validity of ultra-long drilled holes pressure measurement.
The determination of coal seam gas pressure analog simulation experimental device that the present embodiment is provided is surveyed in ultra-long drilled holes gas pressure
Determine in technology, effective sealing of hole can ensure the precision of pressure measurement, and rational chamber volume can accelerate pressure measurement speed.By setting
Gas pressure measurement similarity simulation experiment is counted, it is smaller to demonstrate chamber volume, this faster imagination of pressure balance time, and according to
Experimental result determines optimal pressure measurement air chamber length, and the feasibility of two-stage sealing of hole is demonstrated in terms of experiment, is carried for live pressure measurement
For theoretical foundation.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, any made by repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of determination of coal seam gas pressure analog simulation experimental device, which is characterized in that including coal sample tank (3), high pressure nitrogen
Bottle (1), delivery pipe (2) and gas pressure sensor (4), the coal sample tank (3) include tank body (3.1), sealing cover (3.2), into
Gas port (3.3), gas outlet (3.4) and simulation drill pipe (5), the sealing cover (3.2) are set to the tank body (3.1) open top
Portion, the air inlet (3.3) are opened in the sealing cover (3.2), and the simulation drill pipe (5) is vertically set to the tank body
(3.1) interior center, and its bottom and tank body (3.1) inner bottom surface are affixed, top passes through and exposes to the sealing cover (3.2)；
Simulation drill pipe (5) surface offers multiple simulation drillings (5.1)；The high-pressure nitrogen bottle (1) passes through delivery pipe (2)
It is connect with the air inlet (3.3) of the coal sample tank (3), the gas outlet of the gas pressure sensor (4) and the coal sample tank (3)
(3.4) it connects.
2. determination of coal seam gas pressure analog simulation experimental device according to claim 1, which is characterized in that the tank body
(3.1) it is tubbiness, and both sides opposite on its outer wall are connected with knob；The sealing cover is circle, which is provided with draw ring.
3. determination of coal seam gas pressure analog simulation experimental device according to claim 1, which is characterized in that the simulation
It is 35cm that drill pipe (5), which is located at the length in the tank body,.
4. a kind of side using the determination of coal seam gas pressure analog simulation experimental device described in claim 1-3 any one
Method includes the following steps：
(1) it connects and debugs each instrument and ensure each instrument and equipment well operation and coal sample tank air-tightness；
(the 2 initial similar states of simulation make the gas pressure in coal sample tank remain stable pressure value, and gas enters survey
Diffusion Law is gushed out in the desorption that plenum chamber meets coal-bed gas；
(3) slack tank simulated pressure is tested, and under the conditions of not coalingging in coal sample tank, data is recorded in experimentation, are obtained respectively multigroup
The relationship of the equilibration time and pressure measurement chamber volume of gas pressure value；
(4) original mold pseudopressure of coalingging is tested, and under conditions of filling coal in coal sample tank, data is recorded in experimentation, are obtained respectively
The relationship of the equilibration time and pressure measurement chamber volume of multigroup gas pressure value.
5. according to the method described in claim 4, it is characterized in that, the step (1) includes coal sample tank performing leak test, specifically
For：
Instrument and equipment is connected, without being packed into coal sample in coal sample tank；
Suds are coated in the junction of air inlet, gas outlet and the tank body and sealing cover of coal sample tank；
Gas pressure sensor is connect with gas outlet, high-pressure nitrogen bottle is opened and is inflated into coal sample tank so that gas injection pressure reaches
To certain value；
Each easy air leak position is observed, if bubble-free generates and gas pressure sensor display reading is pressed with high-pressure nitrogen bottle inflation
Power is identical, then illustrates that coal sample tank air-tightness is good.
6. according to the method described in claim 4, it is characterized in that, the initial similar state of simulation is specifically grasped in the step (2)
As：
1) high-pressure nitrogen bottle connects the air inlet of coal sample tank by gas injection sebific duct, and there are holes for junction；
2) simulation coal seam pressure is certain value A, according to pressure value gas injection into coal sample tank of A+0.12MPa, by certain time
Afterwards, the gas pressure in coal sample tank remains within the scope of A ± 0.005Mpa；
3) simulation drilling is handled, processing method is：By cloth polyester fiber packet in simulation drill pipe outer surface, then
Swabbing is pasted on cloth, is continued with cloth bag in its outer layer, last layer is tightly wrapped cloth on simulation drill pipe with nylon cable tie,
And cotton is inserted in drilling, prevents having coal ash to enter gas pressure sensor during pressure measurement.
7. according to the method described in claim 4, it is characterized in that, the specific step of the step (3) slack tank simulated pressure test
Suddenly it is：
1) gas of coal sample tank is slowly released from air inlet, after all gas is released, gas pressure state and atmospheric pressure in tank
Power is identical, is 0MPa；
2) experiment for carrying out three groups of pressure values, is 0.1MPa, 0.3MPa and 0.5MPa respectively, and it is real repeatedly to carry out entirely pneumatic deflation
It tests, record inflates the time of needs when reaching target pressure value into coal sample tank each time, finally averages, and obtains required
Time；
3) gas pressure sensor is removed at the top of the simulation drill pipe of coal sample tank, simulation drill pipe top is blocked with plug
The outlet in portion obtains the uniform charge time according to step 2) and is inflated, after inflation, plug removed, by pressure sensor
It is promptly tightened in simulation drilling, record observation sensor reaches the time used in each pressure value；Change simulation drilling pressure measurement
The volume of gas chamber, tested under different pressure measurement chamber volumes according to the above method of the step reach each pressure value it is required when
Between；
4) relational graph of gas pressure balancing time and pressure measurement chamber volume are drawn according to the data that above step obtains, and analyzed
The relationship of gas pressure balancing time and pressure measurement chamber volume are obtained afterwards.
8. the method according to the description of claim 7 is characterized in that the step 3) of the step (3) slack tank simulated pressure test
It is middle change pressure measurement chamber volume method be：A wax oil for lighted candle outflow is instilled into drilling, after will wear one in the wax oil of solidification
A duck eye ventilation；The length of simulation drill pipe in coal sample tank is respectively 30cm, 20cm, 10cm, 5cm, 2cm, 1cm,
Corresponding pressure measurement chamber volume is respectively 94.2cm3、62.8cm3、31.4cm3、15.7cm3、6.28cm3、3.14cm3, each to survey
Building volume of calming the anger carries out five simulation pressure measurement.
9. according to the method described in claim 4, it is characterized in that, the step (4) is coaling original mold pseudopressure test it is specific
Step is：
1) coal sample is packed into coal sample tank, after being packed into coal sample, seal cap sealing is open in top of the tank；
2) experiment for carrying out three groups of pressure values, is 0.1MPa, 0.3MPa and 0.5MPa respectively, and it is real repeatedly to carry out entirely pneumatic deflation
It tests, record inflates the time of needs when reaching target pressure value into coal sample tank each time, finally averages, and obtains required
Time；
3) gas pressure sensor is removed at the top of the simulation drill pipe of coal sample tank, simulation drill pipe top is blocked with plug
The outlet in portion obtains the uniform charge time according to step 2) and is inflated, after inflation, plug removed, by pressure sensor
It is promptly tightened in simulation drilling, record observation sensor reaches the time used in each pressure value；Change simulation drilling pressure measurement
The volume of gas chamber, tested under different pressure measurement chamber volumes according to the above method of the step reach each pressure value it is required when
Between；
4) relational graph of gas pressure balancing time and pressure measurement chamber volume are drawn according to the data that above step obtains, and analyzed
The relationship of gas pressure balancing time and pressure measurement chamber volume are obtained afterwards.
10. according to the method described in claim 9, the it is characterized in that, step (4) -1) in sample of coalingging enter the step of coal sample tank
It is rapid to be specially：Bottom is first spread into the coal sample that grain size is less than 1mm, then paving grain size is 1mm-3mm coal samples layer, grain size is successively upwards
Then the coal sample of three kinds of grain sizes is mixed and is packed by 3mm-5mm coal sample layers, the coal sample that grain size is 3mm-5mm is finally layered on top layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810497957.XA CN108732329B (en) | 2018-05-14 | 2018-05-14 | Coal seam gas pressure measurement simulation experiment device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810497957.XA CN108732329B (en) | 2018-05-14 | 2018-05-14 | Coal seam gas pressure measurement simulation experiment device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108732329A true CN108732329A (en) | 2018-11-02 |
| CN108732329B CN108732329B (en) | 2023-07-28 |
Family
ID=63935026
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810497957.XA Active CN108732329B (en) | 2018-05-14 | 2018-05-14 | Coal seam gas pressure measurement simulation experiment device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108732329B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109707371A (en) * | 2018-11-19 | 2019-05-03 | 太原理工大学 | A kind of quickly measurement coal bed drilling depth mechanism and method |
| CN112903519A (en) * | 2021-01-19 | 2021-06-04 | 河南理工大学 | System and method for rapidly measuring and calculating desorption amount of coal bed gas |
| CN113847026A (en) * | 2020-10-22 | 2021-12-28 | 河南理工大学 | Coal seam hydraulic punching simulation experiment method |
| CN113866380A (en) * | 2021-09-29 | 2021-12-31 | 中海石油(中国)有限公司 | High-coal-rank coal seam free gas content determination device and determination method |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU1815329C (en) * | 1990-10-29 | 1993-05-15 | Восточный научно-исследовательский институт по безопасности работ в горной промышленности | Method of determination of true initial pressure of gas in gas-saturated coal seam |
| US20040060351A1 (en) * | 2002-09-30 | 2004-04-01 | Gunter William Daniel | Process for predicting porosity and permeability of a coal bed |
| CN101004130A (en) * | 2007-01-19 | 2007-07-25 | 华北科技学院 | Method for plugging back sensing hole for gas pressure, sealing liquid, pressure valve, and pressure measuring unit |
| CN101684729A (en) * | 2007-01-19 | 2010-03-31 | 华北科技学院 | Coal-seam gas pressure test system |
| CN103335916A (en) * | 2013-06-04 | 2013-10-02 | 河南理工大学 | Experiment device for initial laws of tectonic coal gas desorption |
| CN104314509A (en) * | 2014-10-09 | 2015-01-28 | 华北科技学院 | Deep drill hole pressure measuring and blocking method and device |
| CN204286977U (en) * | 2014-11-28 | 2015-04-22 | 焦作市美格安矿业科技有限公司 | Laboratory simulation measures the device of coal-bed gas pressure |
| CN104535740A (en) * | 2014-12-30 | 2015-04-22 | 华北科技学院 | Analog simulation experimental device and method for coalbed gas pressure measurement |
-
2018
- 2018-05-14 CN CN201810497957.XA patent/CN108732329B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU1815329C (en) * | 1990-10-29 | 1993-05-15 | Восточный научно-исследовательский институт по безопасности работ в горной промышленности | Method of determination of true initial pressure of gas in gas-saturated coal seam |
| US20040060351A1 (en) * | 2002-09-30 | 2004-04-01 | Gunter William Daniel | Process for predicting porosity and permeability of a coal bed |
| CN101004130A (en) * | 2007-01-19 | 2007-07-25 | 华北科技学院 | Method for plugging back sensing hole for gas pressure, sealing liquid, pressure valve, and pressure measuring unit |
| CN101684729A (en) * | 2007-01-19 | 2010-03-31 | 华北科技学院 | Coal-seam gas pressure test system |
| CN103335916A (en) * | 2013-06-04 | 2013-10-02 | 河南理工大学 | Experiment device for initial laws of tectonic coal gas desorption |
| CN104314509A (en) * | 2014-10-09 | 2015-01-28 | 华北科技学院 | Deep drill hole pressure measuring and blocking method and device |
| CN204286977U (en) * | 2014-11-28 | 2015-04-22 | 焦作市美格安矿业科技有限公司 | Laboratory simulation measures the device of coal-bed gas pressure |
| CN104535740A (en) * | 2014-12-30 | 2015-04-22 | 华北科技学院 | Analog simulation experimental device and method for coalbed gas pressure measurement |
Non-Patent Citations (1)
| Title |
|---|
| 赵嵘 等: "井下直接法测定煤层瓦斯压力数值模拟", 《煤矿安全》, vol. 48, no. 2, pages 9 - 12 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109707371A (en) * | 2018-11-19 | 2019-05-03 | 太原理工大学 | A kind of quickly measurement coal bed drilling depth mechanism and method |
| CN113847026A (en) * | 2020-10-22 | 2021-12-28 | 河南理工大学 | Coal seam hydraulic punching simulation experiment method |
| CN113847026B (en) * | 2020-10-22 | 2023-05-23 | 河南理工大学 | Coal seam hydraulic punching simulation experiment method |
| CN112903519A (en) * | 2021-01-19 | 2021-06-04 | 河南理工大学 | System and method for rapidly measuring and calculating desorption amount of coal bed gas |
| CN112903519B (en) * | 2021-01-19 | 2023-08-22 | 河南理工大学 | Rapid measuring system and method for desorbable amount of coal bed gas |
| CN113866380A (en) * | 2021-09-29 | 2021-12-31 | 中海石油(中国)有限公司 | High-coal-rank coal seam free gas content determination device and determination method |
| CN113866380B (en) * | 2021-09-29 | 2023-12-08 | 中海石油(中国)有限公司 | High-rank coal seam free gas content measuring device and measuring method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108732329B (en) | 2023-07-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108732329A (en) | A kind of determination of coal seam gas pressure analog simulation experimental device and method | |
| CN108490156B (en) | Test method for mixed gas oil displacement buried stock experiment under high-temperature and high-pressure conditions | |
| CN104729948B (en) | Coal containing methane gas aqueous vapor two phase fluid flow experimental system and method | |
| CN205138940U (en) | Test coal body gas adsorbs desorption heat effect experimental system | |
| CN105756674B (en) | Fracture-matrix coupling flow damage evaluation device and method for simulating formation conditions | |
| CN106970000A (en) | Coal/shale extra-high absorption and Seepage Experiment evaluate shale gas adsorption method | |
| CN105974084B (en) | A kind of coal bed gas extraction experimental simulation device | |
| CN104535455B (en) | Dynamic monitoring pore pressure is distributed and the gas porous flow experimental provision and method of change | |
| CN105571979B (en) | Stand under load tectonic soft coal gas adsorption desorption experiment system and method | |
| CN205786605U (en) | A kind of this coal bed gas extraction experimental simulation device | |
| CN106526094A (en) | Coal and gas outburst simulation experiment device and experiment method | |
| CN106812523B (en) | Physical simulation device for multi-coal-bed gas well drainage and mining and experimental method thereof | |
| CN106677772B (en) | A kind of simulation experiment method for coal bed gas well mining | |
| CN106640060A (en) | Simulation experiment method of multi-layer commingling capacity of natural gas reservoir | |
| CN106840547A (en) | A kind of batteries of electric automobile bag air-tightness detection device and detection method | |
| CN106404568A (en) | True/false-triaxial test device capable of measuring dense rock gas permeability | |
| CN103114851B (en) | Different cranny development coal seams aerogenesis contribution capacity of water testing arrangement | |
| CN105823854A (en) | Gas-solid coupling test device and method for deep coal gas borehole drainage effect | |
| CN106593369A (en) | Simulating test method of CH4 layered displacement by CO2 in multi-layer superposed gas-containing system | |
| CN105114055B (en) | A kind of coal bed gas well mining output coal dust transported simulation test method | |
| CN106568671A (en) | Experimental method for determining gas adsorption quantity of heavy hydrocarbon-containing coal of different component ratios | |
| CN205449758U (en) | Outlet pressure adjustable coal petrography seepage flow experimental system | |
| CN110501256A (en) | A kind of gas level pressure test device for desorption and method | |
| CN206057308U (en) | A kind of coal mine gas extraction drill hole Gas leak position testing laboratory analog | |
| CN206192840U (en) | Dual -purpose permeability testing arrangement of rock core gas -liquid |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |