CN208654232U - Simulate coal body hydraulic fracturing complex resistance measuring system - Google Patents
Simulate coal body hydraulic fracturing complex resistance measuring system Download PDFInfo
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- CN208654232U CN208654232U CN201820618747.7U CN201820618747U CN208654232U CN 208654232 U CN208654232 U CN 208654232U CN 201820618747 U CN201820618747 U CN 201820618747U CN 208654232 U CN208654232 U CN 208654232U
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- pressure
- cylinder
- clamper
- resistance measuring
- complex resistance
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Abstract
Simulate coal body hydraulic fracturing complex resistance measuring system, the system comprises methane tank, pressure gauge, gas valve, pressure regulator valve, vacuum pump, with reference to cylinder, water pump, water tank, clamper, confining pressure pump, axis press pump, complex resistance measuring instrument, computer, water collection tank, gas collection case and constant water bath box；Methane tank connects the gas access of clamper；Gas collection case and water collection tank pass through the gas vent that pipeline connects clamper；The two poles of the earth of complex resistance measuring instrument pass through conducting wire respectively and connect with left and right electrode plate, and the signal output end and computer of complex resistance measuring instrument communicate to connect；The confining pressure orifice of confining pressure pump and clamper；The axis of axis press pump and clamper presses orifice.System described in the utility model realize different hydraulic pressure, different pressure break tube head, etc. the variation of complex resistance under different situations, stratum actual pressure is simulated well, fracturing effect is evaluated to complex resistivity method, prediction coal seam permeability has important experiment meaning.
Description
Technical field
The utility model belongs to contactless evaluation fracturing effect technology scope more particularly to a kind of simulation coal body water
It forces and splits with complex resistance measuring system.
Background technique
Coal and gas prominent is the biggest threat of current mine safety in production, and gas is arch-criminal, so improving
Gas drainage rate is significant with gas accident to coal is prevented.
Improving the method for coal bed gas extraction rate at present is mainly hydraulic fracturing, in practice it has proved that hydraulic fracturing can be to coal body
It is anti-reflection to play the role of good pressure release, greatly improves gas drainage efficiency, in hydraulic fracturing technology application process it is crucial that
The good bad determinations of fracturing effect.Currently, the investigation of fracturing effect remains in very conventional means, such as investigates and bore
The traditional index such as bits amount, water content and investigation gas pumping effect, these parameters are to hydraulic fracturing potential impact region
" point evaluation " cannot achieve continuous " face evaluation ", to cause effect expedition to a certain extent and gas drainage constructs
Blindness.And how effect pressed off to evaluate hydraulic fracturing using a kind of simple and direct quick method, it is our asking of paying close attention to instantly
Topic.
In recent years, complex resistivity method is in rock field around measurement water saturation, prediction permeability, differentiation oil-containing water
The technologies such as layer have many research, imply that complex resistivity method has good application prospect in the logging technique of coal seam.We
Method simulates coal seam hydraulic fracture effect, measures coal body in the complex resistance of fracturing process, hydraulic fracturing is pressed off effect and complex resistance
It is associated, can be used to analyze different fracturing effects and answer by changing pressure break tube head discharge pressure and tube head length
Sensitivity evaluates fracturing effect for complex resistivity method and provides experiment and theories integration.
Utility model content
The utility model is intended to provide a kind of easy to use, and the good simulation coal body hydraulic fracturing of using effect is surveyed with complex resistance
Amount system.
In order to solve the above technical problems, the utility model provides the following technical solution: simulation coal body hydraulic fracturing is used
Complex resistance measuring system, the system comprises methane tank, pressure gauge, gas valve, pressure regulator valve, vacuum pump, with reference to cylinder, water pump,
Water tank, clamper, confining pressure pump, axis press pump, complex resistance measuring instrument, computer, water collection tank, gas collection case and water bath with thermostatic control
Case, clamper are arranged in constant water bath box；
Clamper includes cylinder, and coal sample cylinder is set in cylinder, set on cylinder into coal sample cylinder apply confining pressure confining pressure interface with
And apply the axis crimping mouth of axis pressure into coal sample cylinder；
Gas access and gas vent are communicated on coal sample cylinder；Meanwhile the both ends of coal sample cylinder be respectively set left electrode plate and
Right electrode plate；
Pressure break pipe is communicated on coal sample cylinder, the end of pressure break pipe is provided with the pressure break tube head in coal sample cylinder；
Water tank connects pressure break pipe by water pump；
Methane tank connects the gas access of the clamper by ventilation pipe, and pressure gauge, pressure regulation is arranged on ventilation pipe
Valve and gas valve；
Vacuum pump also connects the gas access of the clamper；
It is connected on ventilation pipe with reference to cylinder；
Gas collection case and water collection tank pass through the gas vent that pipeline is connected to the clamper；
The two poles of the earth of complex resistance measuring instrument pass through conducting wire respectively and the left and right electrode plate of clamper connects, complex resistance measuring instrument
Signal output end and computer communicate to connect；
The confining pressure orifice of confining pressure pump and clamper；
The axis of axis press pump and clamper presses orifice.
Left and right nut is respectively set in cylinder both ends；Rubber sealing boot is provided in cylinder；Pass through screw thread outside the left-handed screw nut
Sealed set has left pressure head in connection installation lid, installation lid, is provided with left mounting base between the left pressure head and left-handed screw nut；
It is connected through a screw thread piston cylinder outside the right nut, is screwed oil cylinder cover outside the piston cylinder, is set in the piston cylinder
Hollow piston is set, the hollow piston passes through oil cylinder cover and is slidingly sealed cooperation, the hollow piston and right nut with oil cylinder cover
Between be provided with right mounting base.
The rubber sealing boot left and right ends are respectively sleeved in the left mounting base and right mounting base, the rubber seal
In set, left plug, left electrode plate, coal sample cylinder, right electrode have been set gradually from left to right between left pressure head and hollow piston
Plate, right plug and right pressure head, the left pressure head, left plug, left electrode plate, right electrode plate, right plug and right pressure head axial centre
It is provided with central air vents, wherein gas access is set to left pressure head through hole, and gas vent is set to right pressure head through hole；
It is correspondingly arranged on left wiring groove on left pressure head, left plug, right wiring groove, left and right wiring are correspondingly arranged on right plug, right pressure head
The left electrode plate and right electrode plate connecting with conducting wire are respectively arranged in slot.
Confining pressure interface is arranged on left-handed screw nut, and confining pressure orifice left-handed screw nut, cylinder, right nut, right mounting base, rubber are close
The confining pressure cavity surrounded between big envelope and left mounting base；It is surrounded between axis pressure orifice piston cylinder, oil cylinder cover and hollow piston
Axis press cavity.
Left mounting base, right mounting base are wedge structure, on the contact surface of the left mounting base and left-handed screw nut and right mounting base
With "○" type sealing ring is respectively arranged on right nut contact surface.
Left plug, right plug are insulating materials, and the left electrode plate is fixedly mounted on left plug, and the right electrode plate is solid
Dingan County is on right plug.
The material of cylinder and coal sample cylinder is PPEK insulating materials；Left electrode plate, right electrode plate are copper metal plate；Coal sample cylinder is
Internal diameter 5cm, the cylinder of length 10cm.
By above technical scheme, the utility model has the following beneficial effects:
The hydraulic fracturing of coal body, uses in the case of the good simulated formation actual pressure of system energy described in the utility model
It is convenient, the measurement of coal body complex resistance variation is realized during simulation, consequently facilitating experimenter analyzes waterpower under different situations
The relationship of fracturing effect and complex resistance evaluates fracturing effect for complex resistivity method and provides experiment and theories integration.
Detailed description of the invention
FIG. 1 is a schematic structural view of the utility model；
Fig. 2 is holder structure schematic diagram；
Fig. 3 is pressure break header structures schematic diagram.
Specific embodiment
Coal body hydraulic fracturing complex resistance measuring system is simulated, as shown in Figure 1, Figure 2 and Figure 3, the system comprises methane
Tank 13, pressure gauge 14, gas valve 15, pressure regulator valve 16, vacuum pump 17, with reference to cylinder 18, water pump 19, water tank 20, clamper 21, enclose
Press pump 23, axis press pump 24, complex resistance measuring instrument 25, computer 26, water collection tank 27, gas collection case 28 and constant water bath box
22, wherein clamper 21 is arranged in constant water bath box 22, and wherein complex resistance measuring instrument is the measurement of IM3533-01LCR complex resistance
Instrument.
In order to guarantee the stabilization of 22 water temperature of constant water bath box, insulating box 29, insulating box are communicated on constant water bath box 22
Water in 29 is constant temperature, guarantees that the water in insulating box 29 is that constant temperature can be realized by the prior art.It can also be in insulating box
Steam jacket is connected on 29 side wall, steam enters steam jacket and heats up to the water in insulating box 29.
Insulating box 29 is equipped with outlet pipe, and outlet pipe connects the water inlet of constant water bath box 22；Constant water bath box 22 simultaneously
Bottom set refluxing opening, refluxing opening connects the import of insulating box 29.
Thermostatted water is entered in constant water bath box 22 by outlet pipe, for guaranteeing the perseverance of water temperature in constant water bath box 22
It is fixed；After the completion of use, the water in constant water bath box 22 is entered in insulating box 29 by refluxing opening, and insulating box 29 is risen again
Temperature guarantees the constant of its water temperature inside.
The clamper 21 includes cylinder 6, sets coal sample cylinder 5 in cylinder 6, sets on cylinder 6 and applies confining pressure into coal sample cylinder 5
Confining pressure interface 2 and the axis for applying axis pressure into coal sample cylinder 5 crimp mouth 7.Confining pressure pump 23 and the confining pressure interface 2 of clamper 21 connect
It is logical；Axis press pump 24 crimps the connection of mouth 7 with the axis of clamper 21.
Gas access 8 and gas vent 9 are communicated on coal sample cylinder 5；Meanwhile left electricity is respectively set in the both ends of coal sample cylinder 5
Pole plate 4 and right electrode plate.The material of cylinder 6 and coal sample cylinder 5 is PPEK insulating materials；Left electrode plate 4, right electrode plate are copper metal
Plate；Coal sample cylinder 5 is internal diameter 5cm, the cylinder 6 of length 10cm.
Meanwhile pressure break pipe 10 is communicated on coal sample cylinder 5, the end of pressure break pipe 10 is provided with the pressure break in coal sample cylinder 5
Tube head 12.
Water tank 20 connects pressure break pipe 10 by water pump 19, so that the water in water tank 20 is passed into pressure break pipe by water pump 19
In 10, then pass through pressure break tube head 12 and be applied in the coal sample in coal sample cylinder 5, realizes the fracturing process of coal sample.
In order to guarantee fracturing effect, avoids impurity from entering in pressure break pipe 10 by water, be equipped in water tank 20
Filter portion, filter house include the strainer being set in water tank 20, and strainer is located at the lower section of the water inlet of water tank 20, enters water in this way
Water in case 20 needs the filtering by strainer.The entrance of water pump 19 is located at the lower section of strainer.
Pressure break pipe 10 and pressure break tube head 12 are connected through a screw thread, thus it is easy to connect, it is readily disassembled.Meanwhile in pressure break pipe
It is provided with gasket between first 12 and pressure break pipe 10, can be let out to avoid liquid between the two by gasket, is improved
Fracturing effect.
Methane tank 13 connects the gas access 8 of the clamper 21 by ventilation pipe, and pressure gauge is arranged on ventilation pipe
14, pressure regulator valve 16 and gas valve 15.Methane gas is passed into clamper 21 by methane tank 13 by ventilation pipe, is being clamped
It enters in device 21 in the coal sample of coal sample cylinder 5, is adsorbed by coal sample.Wherein, the pressure gauge 14 of setting can be read in real time is passed into
The pressure of methane gas in methane tank 13 passes through the adjustable pressure for entering the methane gas in methane tank 13 of pressure regulator valve 16
Power, and gas valve 15 then can control whether ventilation pipe is connected.It is connected on ventilation pipe with reference to cylinder 18, thus for experiment
Process provides reference.
Vacuum pump also connects the gas access 8 of the clamper 21, can coal sample cylinder 5 to clamper 21 by vacuum pump
It is vacuumized.
Gas collection case 28 and water collection tank 27 are connected to the gas vent 9 of the clamper 21 by pipeline, from gas
The water that body outlet 9 comes out enters water collection tank 27, and the gas come out from gas vent 9 enters gas collection case 28.
The two poles of the earth of complex resistance measuring instrument 25 pass through conducting wire 3 respectively and connect with the left and right electrode plate of clamper 21, and complex resistance is surveyed
The signal output end and computer 26 for measuring instrument 25 communicate to connect.
For using effect, specific introduction is done to the structure of clamper 21 below:
Left and right nut is respectively set at the both ends of cylinder 6；
Rubber sealing boot is provided in cylinder 6；It seals and sets during left-handed screw nut is connected through a screw thread installation lid outside, the installation is covered
It is equipped with left pressure head, is provided with left mounting base between the left pressure head and left-handed screw nut；Piston is connected through a screw thread outside the right nut
Cylinder, the piston cylinder are screwed oil cylinder cover outside, and hollow piston is arranged in the piston cylinder, and the hollow piston passes through oil
Cylinder cap is simultaneously slidingly sealed cooperation with oil cylinder cover, and right mounting base is provided between the hollow piston and right nut.
It is respectively sleeved in the left mounting base and right mounting base in rubber sealing boot left and right ends, left mounting base, right peace
Dress seat is wedge structure, is set respectively on the contact surface of the left mounting base and left-handed screw nut and on right mounting base and right nut contact surface
It is equipped with "○" type sealing ring 1.
Be set gradually from left to right in the rubber sealing boot, between left pressure head and hollow piston left plug 11,
Left electrode plate 4, coal sample cylinder 5, right electrode plate, right plug and right pressure head, the left pressure head, left plug 11, left electrode plate 4, right electricity
Pole plate, right plug and right pressure head are axially provided centrally with central air vents, wherein and gas access 8 is set to left pressure head through hole,
Gas vent 9 is set to right pressure head through hole；Left wiring groove, right plug, right pressure head are correspondingly arranged on left pressure head, left plug 11
On be correspondingly arranged on right wiring groove, the left electrode plate 4 and right electrode plate connecting with conducting wire 3 are respectively arranged in left and right wiring groove.
Confining pressure interface 2 is arranged on left-handed screw nut, and confining pressure interface 2 is connected to left-handed screw nut, cylinder 6, right nut, right mounting base, rubber
The confining pressure cavity surrounded between glue sealing shroud and left mounting base；Axis crimps mouth 7 and is connected between piston cylinder, oil cylinder cover and hollow piston
The axis pressure cavity surrounded.
Wherein, left plug 11, right plug are insulating materials, and the left electrode plate 4 is fixedly mounted on left plug 11, described
Right electrode plate is fixedly mounted on right plug.
A kind of simulation coal body hydraulic fracturing complex resistance measurement method carried out using above system, the method are successively wrapped
Include following steps:
(1) experimental provision is connected, air-tightness is examined, confirmation system air-tightness is good.
(2) long 100mm is made in the coal sample of acquisition, coal column is placed on the coal sample cylinder of clamper 21 by the coal column of diameter 50mm
In.
(3) the gas valve between vacuum pump and vacuum pump and clamper 21 is opened, vacuum pump is started, system is carried out
Vacuumize process closes the gas valve between vacuum pump and vacuum pump and clamper 21 when internal system pressure is 10Pa
Door.
It (4) is 30 DEG C of steady temperature by constant water bath box temperature setting, until experiment terminates.
(5) axis press pump and confining pressure pump are opened, progress axis is pressed and confining pressure setting, is used to simulated ground stress, and axis is pressed and confining pressure
It is 6-10Mpa that range, which is arranged,；Variable gradient is 2Mpa, and axis pressure is constant, change confining pressure, to same degree of metamorphism in experimentation
Coal carries out nine kinds of pressure changes: axis pressure is 6Mpa, confining pressure 6Mpa, 8Mpa, 10Mpa；Axis pressure be 8Mpa, confining pressure 6Mpa,
8Mpa, 10Mpa；Axis pressure is 10Mpa, confining pressure 6Mpa, 8Mpa, 10Mpa.
(6) it opens methane tank and is filled with methane gas to clamper 21, when pressure gauge is shown to default gas pressure, preset
Gas pressure is 1Mpa, closes inflation system, places 12-24h and opens gas absorbing device after coal body adsorption gas is stablized
Valve then waits 12-24h again, and making gas, sufficiently absorption reaches balance in clamper 21, closes gas absorbing device valve.
(7) 19 valve of water pump is opened, the water in water tank is applied to coal by pressure break tube head by entering pressure break pipe after pressurization
On body, coal body forms the crack of inner filling water, and the water of outflow passes through outlet conduit influent collection device；Start at this time
IM3533-01LCR complex resistance measuring instrument selectes the complex resistance parameter of measurement, reads data, and data are stored in computer.
(8) it is measured respectively according to step (1)~(7): hydraulic pressure 5Mp, pressure break tube head 20mm；Hydraulic pressure 5Mp, pressure break tube head
40mm；Hydraulic pressure 8Mp, pressure break tube head 20mm；The coal body complex resistance parameter of tetra- kinds of pressure break situations of hydraulic pressure 8Mp, pressure break tube head 40mm is surveyed
After amount, collator.
When work, the water in water tank is entered in coal sample cylinder by water pump carries out pressure break to the coal sample in coal sample cylinder,
To increase the porosity of coal sample, and then increase the gas permeability of coal sample, the gas permeability by increasing coal sample is improved in coal seam watts
This extraction.
The hydraulic fracturing of coal body, uses in the case of the good simulated formation actual pressure of system energy described in the utility model
It is convenient, the measurement of coal body complex resistance variation is realized during simulation, consequently facilitating experimenter analyzes waterpower under different situations
The relationship of fracturing effect and complex resistance evaluates fracturing effect for complex resistivity method and provides experiment and theories integration.
Claims (7)
1. simulate coal body hydraulic fracturing complex resistance measuring system, it is characterised in that: the system comprises methane tank, pressure gauge,
Gas valve, pressure regulator valve, vacuum pump, with reference to cylinder, water pump, water tank, clamper, confining pressure pump, axis press pump, complex resistance measuring instrument, meter
Calculation machine, water collection tank, gas collection case and constant water bath box, clamper are arranged in constant water bath box；
Clamper includes cylinder, and coal sample cylinder is set in cylinder, set on cylinder into coal sample cylinder apply confining pressure confining pressure interface and to
The axis for applying axis pressure in coal sample cylinder crimps mouth；
Gas access and gas vent are communicated on coal sample cylinder；Meanwhile left electrode plate and right electricity is respectively set in the both ends of coal sample cylinder
Pole plate；
Pressure break pipe is communicated on coal sample cylinder, the end of pressure break pipe is provided with the pressure break tube head in coal sample cylinder；
Water tank connects pressure break pipe by water pump；
Methane tank connects the gas access of the clamper by ventilation pipe, be arranged on ventilation pipe pressure gauge, pressure regulator valve and
Gas valve；
Vacuum pump also connects the gas access of the clamper；
It is connected on ventilation pipe with reference to cylinder；
Gas collection case and water collection tank pass through the gas vent that pipeline is connected to the clamper；
The two poles of the earth of complex resistance measuring instrument pass through conducting wire respectively and the left and right electrode plate of clamper connects, the letter of complex resistance measuring instrument
Number output end and computer communicate to connect；
The confining pressure orifice of confining pressure pump and clamper；
The axis of axis press pump and clamper presses orifice.
2. simulation coal body hydraulic fracturing complex resistance measuring system as described in claim 1, it is characterised in that: cylinder both ends point
Left and right nut is not set；Rubber sealing boot is provided in cylinder；Installation lid, the peace are connected through a screw thread outside the left-handed screw nut
Sealed set has left pressure head in capping, is provided with left mounting base between the left pressure head and left-handed screw nut；Pass through outside the right nut
Be threadedly coupled piston cylinder, be screwed oil cylinder cover outside the piston cylinder, hollow piston is set in the piston cylinder, it is described in
Empty piston passes through oil cylinder cover and is slidingly sealed cooperation with oil cylinder cover, and right installation is provided between the hollow piston and right nut
Seat.
3. simulation coal body hydraulic fracturing complex resistance measuring system as claimed in claim 2, it is characterised in that: the rubber is close
Big envelope left and right ends are respectively sleeved in the left mounting base and right mounting base, in the rubber sealing boot, be located at left pressure head and
Left plug, left electrode plate, coal sample cylinder, right electrode plate, right plug and right pressure head have been set gradually from left to right between hollow piston,
The left pressure head, left plug, left electrode plate, right electrode plate, right plug and right pressure head are axially provided centrally with central air vents,
In, gas access is set to left pressure head through hole, and gas vent is set to right pressure head through hole；It is corresponding on left pressure head, left plug
It is provided with left wiring groove, right wiring groove is correspondingly arranged on right plug, right pressure head, is respectively arranged with and leads in left and right wiring groove
The left electrode plate and right electrode plate of line connection.
4. simulation coal body hydraulic fracturing complex resistance measuring system as claimed in claim 3, it is characterised in that: confining pressure interface is set
It sets on left-handed screw nut, between confining pressure orifice left-handed screw nut, cylinder, right nut, right mounting base, rubber sealing boot and left mounting base
The confining pressure cavity surrounded；The axis pressure cavity surrounded between axis pressure orifice piston cylinder, oil cylinder cover and hollow piston.
5. simulation coal body hydraulic fracturing complex resistance measuring system as claimed in claim 4, it is characterised in that: left mounting base,
Right mounting base is wedge structure, is divided on the contact surface of the left mounting base and left-handed screw nut and on right mounting base and right nut contact surface
It is not provided with "○" type sealing ring.
6. simulation coal body hydraulic fracturing complex resistance measuring system as claimed in claim 5, it is characterised in that: left plug, the right side
Plug is insulating materials, and the left electrode plate is fixedly mounted on left plug, and the right electrode plate is fixedly mounted on right plug.
7. the simulation coal body hydraulic fracturing complex resistance measuring system as described in claim 1 to 6 any one, feature exist
In: the material of cylinder and coal sample cylinder is PPEK insulating materials；Left electrode plate, right electrode plate are copper metal plate；Coal sample cylinder is internal diameter
5cm, the cylinder of length 10cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820618747.7U CN208654232U (en) | 2018-04-27 | 2018-04-27 | Simulate coal body hydraulic fracturing complex resistance measuring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820618747.7U CN208654232U (en) | 2018-04-27 | 2018-04-27 | Simulate coal body hydraulic fracturing complex resistance measuring system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208654232U true CN208654232U (en) | 2019-03-26 |
Family
ID=65775562
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820618747.7U Expired - Fee Related CN208654232U (en) | 2018-04-27 | 2018-04-27 | Simulate coal body hydraulic fracturing complex resistance measuring system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208654232U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108614156A (en) * | 2018-04-27 | 2018-10-02 | 河南理工大学 | Simulate coal body hydraulic fracturing complex resistance measuring system and method |
| CN116448823A (en) * | 2023-06-15 | 2023-07-18 | 中南大学 | Device and method for measuring resistivity of rock in hydraulic fracturing process under high-temperature and high-pressure conditions |
-
2018
- 2018-04-27 CN CN201820618747.7U patent/CN208654232U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108614156A (en) * | 2018-04-27 | 2018-10-02 | 河南理工大学 | Simulate coal body hydraulic fracturing complex resistance measuring system and method |
| CN108614156B (en) * | 2018-04-27 | 2023-12-08 | 河南理工大学 | Complex resistance measurement system and method for simulating hydraulic fracturing of coal |
| CN116448823A (en) * | 2023-06-15 | 2023-07-18 | 中南大学 | Device and method for measuring resistivity of rock in hydraulic fracturing process under high-temperature and high-pressure conditions |
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| GR01 | Patent grant | ||
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Granted publication date: 20190326 Termination date: 20200427 |