CN109813644A - A kind of hypotonic rock mine porosity measurement system and method - Google Patents
A kind of hypotonic rock mine porosity measurement system and method Download PDFInfo
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- CN109813644A CN109813644A CN201910209426.0A CN201910209426A CN109813644A CN 109813644 A CN109813644 A CN 109813644A CN 201910209426 A CN201910209426 A CN 201910209426A CN 109813644 A CN109813644 A CN 109813644A
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Abstract
The present invention provides a kind of hypotonic rock mine porosity measurement system and methods.The system includes: sample apparatus for placing, is had for placing the sample cavity of the sample to be tested of hypotonic rock mine and the end cap of sealed sample chamber；First piston container is connected by the first isolating valve with sample cavity；Second piston container is connected by the second isolating valve with sample cavity；Vacuum valve；Intake valve；Valve control device, for controlling the opening and closing of the first isolating valve, the second isolating valve, vacuum valve and intake valve；First pressure sensor is arranged between the first isolating valve and first piston container；Second pressure sensor is arranged between the second isolating valve and intake valve；Data acquisition device, for acquiring the pressure value of first piston container and second piston container corresponding first pressure sensor and the acquisition of second pressure sensor at multiple positions in compression or backward travel；Data processing equipment, data for being acquired according to data acquisition device obtain the porosity of sample to be tested to calculate.
Description
Technical field
The present invention relates to rock mine porosity measurement technical fields, more particularly to a kind of hypotonic rock mine porosity measurement system
And method.
Background technique
It is our times various countries natural gas work by the unconventional gas resource of representative of tight gas, coal bed gas and shale gas
The efforts will be concentrated on prospecting development object of industry.Porosity is the important physical property of rock mine porous media, its quantitatively characterizing reservoir rock is overall
It is the key parameter for carrying out evaluating reservoir as the pore volume accounting of petroleum resources reservoir space in product.Unconventional gas
The reservoir rock mine of hiding has extremely low porosity (usually less than 10%), and shale and coal have a large amount of micro-, nanoapertures, have
Difficulty is analyzed in very high measurement.The measurement that porosity is carried out based on the practical rock sample that drilling and coring delivery obtains, being must in exploration process
One of indispensable link and current technological difficulties.
Currently, the measurement method of hypotonic rock mine porosity mainly includes full water weight method, mercury injection method and helium plavini
Deng.Wherein, traditional full water weight method is saturated rock salt sample by water phase in advance with freeze-thaw method needs, but hypotonic rock salt sample is complete
The pretreatment time of complete full water is long, saturation effect is undesirable, and clay mineral in rock salt sample and organic matter is easy and invasion
Irreversible chemical reaction occurs for water phase, causes sample broke.Mercury injection method equally will cause the destruction of sample pore structure, Wu Fakai
Test is repeated several times in exhibition.Gas expansion method mainly passes through the pressure change in measurement helium expansion process, calculates rock salt sample
Pore volume, and then calculate the porosity of sample.The method avoids samples caused by full water or pressure mercury process can not inversion
Change, the sample of preservation can be not only used for retest, it may also be used for the multiclass such as permeability, gas-bearing property and temperature absorption of rock mine
Experiment may be implemented once to prepare repeatedly utilization.Therefore, the porosity measurement technology based on gas expansion method has and answers well
Use prospect.
Rock mine porosity is defined as the ratio between its interior pore volume and exterior visual volume (apparent volume), and wherein sample regards
Volume, apparent density, which need to be measured by independent experiment, to be obtained, and the core missions of porosity measurement are accurate measurement sample interior holes
Gap volume, or the porous structure skeleton volume by measuring sample calculate its pore volume.The basic thought of gas expansion method is,
By the pressure change in measurement sample cavity, gas free space volumes (the Gas Free obtained in sample cavity is calculated first
Space), i.e. the difference of sample cavity empty volume and sample skeleton volume.
In turn, by sample cavity empty volume that is known or independently measuring, sample skeleton volume is calculated.Accurately to survey
Sample cavity empty volume and sample intracavity gas free space volumes are measured, existing porosity measurement technology mainly uses following skill
Art scheme: into sample cavity, there is the standard of different volumes can not seep solid volume block for addition, and is connected to a gas storage and held
Device by operating the opening and closing of certain isolating valve, repeatedly carries out helium expansion test forward and backward to sample cavity filling sample, final comprehensive
Each secondary test result is closed, sample cavity empty volume and sample intracavity gas free space volumes are calculated.
However, the porosity of hypotonic rock mine is low, sample pore volume is much smaller than sample cavity empty volume, it is vacant to sample cavity
Volume, sample intracavity gas free space volumes small measuring error can all significantly affect measurement result.In view of these because
The major defect of element, prior art arrangement is:
1) isolating valve itself for being connected to sample cavity and air container has volume, in the case where opening and closing two states, sample
Product intracavity gas free space volumes can change a lot, which even can be with sample interior pore-body
Product is in same order, and technical solution can not accurately measure this partial volume at present；
2) helium leakage, sample cavity need to carry out proper seal in order to prevent, are related to the sealing such as gasket seal, O-ring
The use of part compresses and replacement, when this each sample cavity uncap to fill standard body block and be connected in measuring system,
Its volume may change；
3) it is related to the demolition, installation of multiple sample cavity for the test process of single sample, it is cumbersome, automate expansible degree
It is low.
Summary of the invention
It is an object of the present invention to improve the precision of hypotonic rock mine porosity measurement.
Another object of the present invention is to reduce the feelings for causing error to hypotonic rock mine porosity measurement system as far as possible
Condition.
Another object of the present invention is to reduce the complexity and operating process of hypotonic rock mine porosity measurement system
Cumbersome degree.
Particularly, the present invention provides a kind of hypotonic rock mine porosity measurement systems, including thermostatic chamber and setting are in institute
The indoor porosity measuring device of constant temperature is stated, the porosity measuring device includes:
Sample apparatus for placing has sample cavity and the sealing sample cavity for placing the sample to be tested of hypotonic rock mine
End cap；
First piston container is connected by the first isolating valve with the sample cavity；
Second piston container is connected by the second isolating valve with the sample cavity；
Vacuum valve is connected with the second piston container, is connected by second isolating valve with the sample cavity, and lead to
It crosses first isolating valve and second isolating valve is connected with the first piston container；
Intake valve is connected with the second piston container, is connected by second isolating valve with the sample cavity, and lead to
It crosses first isolating valve and second isolating valve is connected with the first piston container；
Valve control device, for control first isolating valve, second isolating valve, the vacuum valve and it is described into
The opening and closing of air valve；
First pressure sensor is arranged between first isolating valve and the first piston container；
Second pressure sensor is arranged between second isolating valve and the intake valve；
Data acquisition device, for acquiring described first under the control that the valve control device opens and closes each valve
The corresponding first pressure senses at multiple positions in compression or backward travel for piston container and the second piston container
The pressure value of device and second pressure sensor acquisition；
Data processing equipment, the data for being acquired according to the data acquisition device obtain the sample to be tested to calculate
Porosity.
Optionally, the data processing equipment is configured to be placed according to the data acquisition device in the sample to be tested
The data acquired when in the sample cavity calculate the gas free space volumes V obtained in the sample cavityFS, and according to institute
The data that data acquisition device is acquired when the sample to be tested is moved out of the sample cavity are stated to calculate and obtain the sample cavity
Empty volume VS, the porosity φ for obtaining the sample to be tested is calculated further according to following formula,
Wherein, ρVFor the apparent density of the sample to be tested, m is the quality of the sample to be tested.
Optionally, the data processing equipment is configured to after the sample to be tested is placed on the sample cavity, in institute
When stating the second isolating valve slowly closing and first isolating valve unlatching, to by the first piston container, first isolation
The first measuring unit that gas free space volumes in valve and the sample cavity are constituted carries out compression or the survey of backward travel
It is fixed, and calculate the total measurement (volume) V for obtaining presently described first measuring unitm1；
It is keeping the first isolating valve unlatching, second isolating valve slowly to open again and the first piston is kept to hold
When the piston position of device is constant, to by the second piston container, second isolating valve and the first measuring unit structure
At the second measuring unit carry out compression or the measurement of backward travel, and calculate the total appearance for obtaining presently described second measuring unit
Product Vm2；
Again in the first isolating valve slowly closing, to by the second piston container, second isolating valve and
The third measuring unit that gas free space volumes in the sample cavity are constituted carries out compression or the measurement of backward travel, and counts
Calculate the total measurement (volume) V for obtaining presently described third measuring unitm3；
According to formula VFS=Vm3-Vm2+Vm1Calculate the gas free space volumes V obtained in the sample cavityFS；
Optionally, the data processing equipment is configured to after the sample to be tested is moved out of the sample cavity, described
When the second isolating valve slowly closing and first isolating valve unlatching, to by the first piston container, first isolating valve
And the 4th measuring unit that the sample cavity empty volume is constituted carries out compression or the measurement of backward travel, and calculates and worked as
The total measurement (volume) V of preceding 4th measuring unitm4；
It is keeping the first isolating valve unlatching, second isolating valve slowly to open again and the first piston is kept to hold
When the piston position of device is constant, to by the second piston container, second isolating valve and the 4th measuring unit structure
At the 5th measuring unit carry out compression or the measurement of backward travel, and calculate the total appearance for obtaining presently described 5th measuring unit
Product Vm5；
Again in the first isolating valve slowly closing, to by the second piston container, second isolating valve and
The 6th measuring unit that the sample cavity empty volume is constituted carries out compression or the measurement of backward travel, and calculates and obtain current institute
State the total measurement (volume) V of the 6th measuring unitm6；
According to formula VS=Vm6-Vm5+Vm4It calculates and obtains the sample cavity empty volume VS。
Particularly, the present invention also provides a kind of hypotonic holes Yan Kuang based on above-mentioned hypotonic rock mine porosity measurement system
Porosity measurement method, includes the following steps:
Intake valve is closed, and opens vacuum valve, the first isolating valve and the second isolating valve, the hypotonic rock mine porosity is surveyed
Amount system vacuumizes；
The piston position of the first piston container and the second piston container is adjusted, so that the first piston container
It is roughly equal with the total volume of the gas free space in the sample cavity and the second piston volume of a container；
Opening and closing control is carried out respectively to the intake valve, the vacuum valve, first isolating valve and second isolating valve
System acquires the first piston container and the second piston container in compression or backward travel corresponding the at multiple positions
The pressure value of one pressure sensor and the acquisition of second pressure sensor；
The porosity for obtaining the sample to be tested is calculated according to data collected.
Optionally, it is calculated according to data collected and obtains the porosity of the sample to be tested and include:
Data collected obtain when be placed in the sample cavity of sample apparatus for placing according to the sample to be tested to calculate
Obtain the gas free space volumes V in the sample cavityFS；
Data collected obtain the sample cavity space to calculate when being moved out of the sample cavity according to the sample to be tested
Set volume VS；
The porosity φ for obtaining the sample to be tested is calculated according to the following formula,
Wherein, ρVFor the apparent density of the sample to be tested, m is the quality of the sample to be tested.
Optionally, in the closing intake valve, and vacuum valve, the first isolating valve and the second isolating valve are opened, to described low
It further include the sample to be tested being placed in the sample cavity, and make institute before infiltration rock mine porosity measurement system vacuumizes
The end cap seal of sample apparatus for placing is stated in one end of the sample cavity；
At this point, it is described to the intake valve, the vacuum valve, first isolating valve and second isolating valve respectively into
Row opening and closing control, acquires the first piston container and the second piston container in compression or backward travel at multiple positions
The pressure value of corresponding first pressure sensor and the acquisition of second pressure sensor, includes the following steps:
The vacuum valve is closed, opens intake valve, and in the hypotonic rock mine porosity measurement system boost to default pressure
The intake valve is closed after power；
Second isolating valve described in slowly closing keeps first isolating valve to open, to by the first piston container, institute
State the first measuring unit that gas free space volumes in the first isolating valve and the sample cavity are constituted carry out compression or after
The measurement of regression journey, and calculate the total measurement (volume) V for obtaining presently described first measuring unitm1；
It keeps first isolating valve to open, slowly open second isolating valve and keep the first piston container
Piston position is constant, to be made of the second piston container, second isolating valve and first measuring unit
Two measuring units carry out compression or the measurement of backward travel, and calculate the total measurement (volume) V for obtaining presently described second measuring unitm2；
First isolating valve described in slowly closing, to by the second piston container, second isolating valve and the sample
The third measuring unit that the intracavitary gas free space volumes of product are constituted carries out compression or the measurement of backward travel, and calculates acquisition
The total measurement (volume) V of presently described third measuring unitm3；
Optionally, described that the gas free space volumes V obtained in the sample cavity is calculated according to data collectedFS
The step of in, according to formula VFS=Vm3-Vm2+Vm1Calculate the gas free space volumes V obtained in the sample cavityFS。
Number collected when optionally, in the sample cavity that sample apparatus for placing is placed on according to the sample to be tested
According to calculating the gas free space volumes V obtained in the sample cavityFSIt later, further include using the vacuum valve pressure release and inciting somebody to action
The sample to be tested removes the sample cavity, again by the end cap seal in one end of the sample cavity；
At this point, it is described to the intake valve, the vacuum valve, first isolating valve and second isolating valve respectively into
Row opening and closing control, acquires the first piston container and the second piston container in compression or backward travel at multiple positions
The pressure value of corresponding first pressure sensor and the acquisition of second pressure sensor, includes the following steps:
Second isolating valve described in slowly closing keeps first isolating valve to open, to by the first piston container, institute
The 4th measuring unit for stating the first isolating valve and sample cavity empty volume composition carries out compression or the measurement of backward travel,
And calculate the total measurement (volume) V for obtaining presently described 4th measuring unitm4；
It keeps first isolating valve to open, slowly open second isolating valve and keep the first piston container
Piston position is constant, to be made of the second piston container, second isolating valve and the 4th measuring unit
Five measuring units carry out compression or the measurement of backward travel, and calculate the total measurement (volume) V for obtaining presently described 5th measuring unitm5；
First isolating valve described in slowly closing, to by the second piston container, second isolating valve and the sample
The 6th measuring unit that product chamber empty volume is constituted carries out compression or the measurement of backward travel, and calculates acquisition the presently described 6th
The total measurement (volume) V of measuring unitm6；
Optionally, the data collected when being moved out of the sample cavity according to the sample to be tested obtain institute to calculate
State sample cavity empty volume VSThe step of in, according to formula VS=Vm6-Vm5+Vm4It calculates and obtains the sample cavity empty volume VS。
Optionally, to free by the gas in the first piston container, first isolating valve and the sample cavity
The first measuring unit that spatial volume is constituted carries out compression or the measurement of backward travel, and calculates and obtain presently described first measurement
The total measurement (volume) V of unitm1, include the following steps:
To by the gas free space volumes in the first piston container, first isolating valve and the sample cavity
The first measuring unit constituted carries out compression or the measurement of backward travel, calculates the original volume for obtaining the first piston container
V10, first isolating valve internal capacity Vv1And the gas free space volumes V in the sample cavityFSSummation V10+
Vv1+VFS；
Piston when the first piston container is relative to its initial position after measurement compression or backward travel measure
Displacement V1f；
According to formula Vm1=V10+Vv1+VFS-ΔV1fCalculate the total measurement (volume) V for obtaining presently described first measuring unitm1；
Optionally, to being made of the second piston container, second isolating valve and first measuring unit
Second measuring unit carries out compression or the measurement of backward travel, and calculates the total measurement (volume) for obtaining presently described second measuring unit
Vm2, include the following steps:
The second measurement to being made of the second piston container, second isolating valve and first measuring unit
Unit carries out compression or the measurement of backward travel, calculates the original volume V for obtaining the second piston container20, described second every
Internal capacity V from valvev2And the volume V of first measuring unitm1Summation V20+Vv2+Vm1；
Piston when the second piston container is relative to its initial position after measurement compression or backward travel measure
Displacement V2f；
According to formula Vm2=V20+Vv2+Vm1-ΔV2fCalculate the total measurement (volume) V for obtaining presently described second measuring unitm2；
Optionally, to free by the gas in the second piston container, second isolating valve and the sample cavity
The third measuring unit that spatial volume is constituted carries out compression or the measurement of backward travel, and calculates and obtain presently described third measurement
The total measurement (volume) V of unitm3, include the following steps:
To by the gas free space volumes in the second piston container, second isolating valve and the sample cavity
The third measuring unit of composition carries out compression or the measurement of backward travel, calculates the original volume for obtaining the second piston container
V20, second isolating valve internal capacity Vv2And the gas free space volumes V in the sample cavityFSSummation V20+
Vv2+VFS；
According to formula Vm3=V20+Vv2+VFS-ΔV2fCalculate the total measurement (volume) V for obtaining presently described third measuring unitm3；
Optionally, it is constituted to by the first piston container, first isolating valve and the sample cavity empty volume
The 4th measuring unit carry out compression or the measurement of backward travel, and calculate the total measurement (volume) for obtaining presently described 4th measuring unit
Vm4, include the following steps:
The 4th be made of the first piston container, first isolating valve and the sample cavity empty volume is surveyed
Amount unit carries out compression or the measurement of backward travel, calculates the original volume V for obtaining the first piston container10, described first
The internal capacity V of isolating valvev1And the sample cavity empty volume VSSummation V10+Vv1+VS；
Piston when the first piston container is relative to its initial position after measurement compression or backward travel measure
Displacement V1f；
According to formula Vm4=V10+Vv1+VS-ΔV1fCalculate the total measurement (volume) V for obtaining presently described 4th measuring unitm4；
Optionally, to being made of the second piston container, second isolating valve and the 4th measuring unit
5th measuring unit carries out compression or the measurement of backward travel, and calculates the total measurement (volume) for obtaining presently described 5th measuring unit
Vm5, include the following steps:
The 5th measurement to being made of the second piston container, second isolating valve and the 4th measuring unit
Unit carries out compression or the measurement of backward travel, calculates the original volume V for obtaining the second piston container20, described second every
Internal capacity V from valvev2And the volume V of the 4th measuring unitm4Summation V20+Vv2+Vm4；
Piston when the second piston container is relative to its initial position after measurement compression or backward travel measure
Displacement V2f；
According to formula Vm5=V20+Vv2+Vm4-ΔV2fCalculate the total measurement (volume) V for obtaining presently described 5th measuring unitm5；
Optionally, it is constituted to by the second piston container, second isolating valve and the sample cavity empty volume
The 6th measuring unit carry out compression or the measurement of backward travel, and calculate the total measurement (volume) for obtaining presently described 6th measuring unit
Vm6, include the following steps:
The 6th be made of the second piston container, second isolating valve and the sample cavity empty volume is surveyed
Amount unit carries out compression or the measurement of backward travel, calculates the original volume V for obtaining the second piston container20, described second
The internal capacity V of isolating valvev2And the sample cavity empty volume VSSummation V20+Vv2+VS；
According to formula Vm6=V20+Vv2+VS-ΔV2fCalculate the total measurement (volume) V for obtaining presently described 6th measuring unitm6。
Optionally, to first measuring unit, second measuring unit, the third measuring unit, the described 4th
Measuring unit, the 5th measuring unit and the 6th measuring unit carry out compression or backward travel measurement, obtain every
From valve volume Vv, piston container original volume V0And the sample cavity volume V to be measuredxTotal volume, wherein the sample
Chamber volume V to be measuredxFor the gas free space volumes V in the sample cavityFSOr the sample cavity empty volume VS, including it is as follows
Step:
Isolating valve is opened, piston container is connected to sample cavity, and vacuumizes；
Being inflated to pressure into the measuring unit being made of the isolating valve, the piston container and the sample cavity is
P0, while recording the initial position X of the piston container at this time0；
The isolating valve is kept to open, the multiple positions taken in the shift motion of the piston container, while recording institute
State piston container position XiCorresponding pressure reading P when variationi；
According to formula Δ Vi=(Xi-X0) * A calculates piston vessel volume relative variation Δ described in the shift motion
Vi, wherein A is the sectional area of the cavity of piston component；
It calculates and obtains piston vessel volume relative variation Δ V described in the shift motioniCorresponding Pi；
By data point (Δ V when testingi,Pi) it is organized into uplink curve, and the uplink curve is fitted, thus
Obtain the original volume V of the piston container0, the isolating valve volume VvAnd the sample cavity volume V to be measuredxSummation V0+
Vv+Vx；
Optionally, when carrying out compression or the measurement of backward travel to first measuring unit, the isolating valve refers to institute
The first isolating valve is stated, the piston container refers to the first piston container, and the sample cavity volume to be measured is the sample cavity
Interior gas free space volumes；
Optionally, when carrying out compression or the measurement of backward travel to second measuring unit, the isolating valve refers to institute
The first isolating valve and second isolating valve are stated, the piston container refers to that the first piston container and the second piston hold
Device, the sample cavity volume to be measured are the gas free space volumes in the sample cavity；
Optionally, when carrying out compression or the measurement of backward travel to the third measuring unit, the isolating valve refers to institute
The second isolating valve is stated, the piston container refers to the second piston container, and the sample cavity volume to be measured is the sample cavity
Interior gas free space volumes；
Optionally, when carrying out compression or the measurement of backward travel to the 4th measuring unit, the isolating valve refers to institute
The first isolating valve is stated, the piston container refers to the first piston container, and the sample cavity volume to be measured is the sample cavity
Empty volume；
Optionally, when carrying out compression or the measurement of backward travel to the 5th measuring unit, the isolating valve refers to institute
The first isolating valve and second isolating valve are stated, the piston container refers to that the first piston container and the second piston hold
Device, the sample cavity volume to be measured are the sample cavity empty volume；
Optionally, when carrying out compression or the measurement of backward travel to the 6th measuring unit, the isolating valve refers to institute
The second isolating valve is stated, the piston container refers to the second piston container, and the sample cavity volume to be measured is the sample cavity
Empty volume.
Optionally, the calculating obtains piston vessel volume relative variation Δ V described in the shift motioniIt is corresponding
Pressure Pi, calculated according to following formula and obtain pressure Pi:
Vm=V0+Vv+Vx
Wherein, Δ ViThe relative variation of piston vessel volume described in shift motion is stated to be described.
According to the solution of the present invention, the precision which passes through the driving of step/servo motor with high precision
The relative variation of piston control system volume replaces the relevant operation for adding standard body block in conventional solution, improves
Helium plavini volumetric measurement principle, precise measurement sample skeleton volume and sample cavity empty volume, and then realize to hole
The high-acruracy survey of degree.Without placing standard body block in the sample cavity, at most only carries out sample cavity twice and assemble, can be completed
Entire testing process, high degree of automation, and the influence of isolating valve internal volume can be shielded completely, it further increases to sample
The measurement accuracy of gas free space volumes in product chamber empty volume and sample cavity.
According to the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will be brighter
The above and other objects, advantages and features of the present invention.
Detailed description of the invention
Some specific embodiments of the present invention is described in detail by way of example and not limitation with reference to the accompanying drawings hereinafter.
Identical appended drawing reference denotes same or similar part or part in attached drawing.It should be appreciated by those skilled in the art that these
What attached drawing was not necessarily drawn to scale.In attached drawing:
Fig. 1 shows the schematic diagram of hypotonic rock mine porosity measurement system according to an embodiment of the invention；
Fig. 2 shows the hypotonic rocks according to an embodiment of the invention based on above-mentioned hypotonic rock mine porosity measurement system
The schematic flow chart of mine porosity measurement method；
Fig. 3 shows the schematic flow chart of step S400 shown in Fig. 2；
Fig. 4 shows the schematic flow chart of step S300 shown in Fig. 2；
Fig. 5 shows the schematic flow chart of step S410 shown in Fig. 3；
Fig. 6 shows the schematic flow chart of the schematic flow chart of step S411 shown in Fig. 5；
Fig. 7 shows the schematic flow chart of the schematic flow chart of step S412 shown in Fig. 5；
Fig. 8 shows the schematic flow chart of the schematic flow chart of step S413 shown in Fig. 5；
Fig. 9 shows the schematic flow chart of other steps of step S300 shown in Fig. 2；
Figure 10 shows the schematic flow chart of step S420 shown in Fig. 3；
Figure 11 shows the schematic flow chart of the schematic flow chart of step S421 shown in Figure 10；
Figure 12 shows the schematic flow chart of the schematic flow chart of step S422 shown in Figure 10；
Figure 13 shows the schematic flow chart of the schematic flow chart of step S423 shown in Figure 10；
Figure 14 shows the schematic flow chart of the total volume according to an embodiment of the invention for obtaining measuring unit；
Figure 15 (a) shows the schematic block diagram of measuring unit shown in Figure 14 in the initial state；
Figure 15 (b) shows schematic block diagram of the measuring unit shown in Figure 14 in compression travel；
Figure 16 shows the schematic diagram of uplink curve in the step S6 in method shown in Figure 14；
In figure: 1- thermostatic chamber, 2- sample apparatus for placing, 21- sample cavity, 22- end cap, 3- first piston container, 4- second
Piston container, 5- vacuum valve, 6- intake valve, 7- first pressure sensor, 8- second pressure sensor, the first isolating valve of 9-, 10-
Second isolating valve, 11- sample to be tested.
Specific embodiment
Fig. 1 shows the schematic diagram of hypotonic rock mine porosity measurement system according to an embodiment of the invention.
As shown in Figure 1, the hypotonic rock mine porosity measurement system includes thermostatic chamber 1 and the porosity measurement that is arranged in thermostatic chamber 1
Device, the porosity measuring device include sample apparatus for placing 2, first piston container 3, second piston container 4, vacuum valve 5, into
Air valve 6, valve control device (not shown), first pressure sensor 7, second pressure sensor 8, data acquisition device
(not shown) and data processing equipment (not shown).
There is temperature controller in the thermostatic chamber 1, the temperature in thermostatic chamber 1 is controlled under a certain steady temperature.The sample
Apparatus for placing 2 includes the end cap 22 for the sample cavity 21 and sealed sample chamber 21 of placing the sample to be tested 11 of hypotonic rock mine,
The end cap 22 is sealed in one end of sample cavity 21.The end cap 22 can carry out proper seal to sample cavity 21, and seal form can
To include gasket seal, O-ring sealing etc..
The first piston container 3 is connected by the first isolating valve 9 with sample cavity 21.The second piston container 4 passes through second
Isolating valve 10 is connected with sample cavity 21.The first piston container 3 and second piston container 4 all can be cylindrical precise piston appearances
Device.Driving motor, lead screw, position sensor and by driving are provided in the first piston container 3 and second piston container 4
Motor-driven piston component.Piston component can smoothly move back and forth under the driving of driving motor, and have excellent
Good gas seal property.Position sensor is high precision position sensor, can be for based on the principles such as optics or acoustics
Position sensor.The driving motor is stepper motor or servo motor, and but it is not limited to this.
The vacuum valve 5 is connected with second piston container 4, is connected by the second isolating valve 10 with sample cavity 21, and passes through the
One isolating valve 9 and the second isolating valve 10 are connected with first piston container 3.The intake valve 6 is connected with second piston container 4, passes through
Second isolating valve 10 is connected with sample cavity 21, and passes through the first isolating valve 9 and the second isolating valve 10 and 3 phase of first piston container
Even.First isolating valve 9, the second isolating valve 10, vacuum valve 5 and intake valve 6 for example can choose with good seal performance
Ball valve, shut-off valve etc..
The valve control device is for controlling opening for the first isolating valve 9, the second isolating valve 10, vacuum valve 5 and intake valve 6
It closes.The first pressure sensor 7 is arranged between the first isolating valve 9 and first piston container 3.The second pressure sensor 8 is set
It sets between the second isolating valve 10 and intake valve 6.
The data acquisition device is used under the control that valve control device opens and closes each valve, acquires first piston container
3 corresponding first pressure sensor 7 and second pressure pass at multiple positions in compression or backward travel with second piston container 4
The pressure value that sensor 8 acquires.The data processing equipment is to be measured for calculating acquisition according to the data that data acquisition device acquires
The porosity of sample 11.
The data processing equipment is configured to according to data acquisition device when sample to be tested 11 is placed in sample cavity 21
The data of acquisition come calculate obtain sample cavity 21 in gas free space volumes VFS, and according to data acquisition device to test sample
Product 11 are moved out of the data acquired when sample cavity 21 and obtain sample cavity empty volume VS to calculate, and obtain further according to following formula calculating
The porosity φ of sample to be tested 11 is obtained,
Wherein, ρVFor the apparent density of sample to be tested, m is the quality of sample to be tested.
The data processing equipment is configured to after sample to be tested 11 is placed on sample cavity 21, slow in the second isolating valve 10
When closing and the unlatching of the first isolating valve 9, to free by the gas in first piston container 3, the first isolating valve 9 and sample cavity 21
The first measuring unit that spatial volume is constituted carries out compression or the measurement of backward travel, and calculates and obtain current first measuring unit
Total measurement (volume) Vm1；It is keeping the unlatching of the first isolating valve 9, the second isolating valve 10 slowly to open again and is keeping first piston container 3
It is single to the second measurement being made of second piston container 4, the second isolating valve 10 and the first measuring unit when piston position is constant
Member carries out compression or the measurement of backward travel, and calculates the total measurement (volume) V for obtaining current second measuring unitm2；Again in the first isolation
When 9 slowly closing of valve, to by the gas free space volumes in second piston container 4, the second isolating valve 10 and sample cavity 21
The third measuring unit of composition carries out compression or the measurement of backward travel, and calculates the total measurement (volume) for obtaining current third measuring unit
Vm3；According to formula VFS=Vm3-Vm2+Vm1Calculate the gas free space volumes V obtained in sample cavity 21FS。
Also, the data processing equipment is configured to after sample to be tested 11 is moved out of sample cavity 21, in the second isolating valve 10
When slowly closing and the unlatching of the first isolating valve 9, to by first piston container 3, the first isolating valve 9 and sample cavity empty volume structure
At the 4th measuring unit carry out compression or the measurement of backward travel, and calculate the total measurement (volume) for obtaining current 4th measuring unit
Vm4；The unlatching of the first isolating valve 9, the second isolating valve 10 is being kept slowly to open and keep the piston position of first piston container 3 again
When constant, the 5th measuring unit being made of second piston container 4, the second isolating valve 10 and the 4th measuring unit is pressed
Contracting or the measurement of backward travel, and calculate the total measurement (volume) V for obtaining current 5th measuring unitm5；It is slowly closed in the first isolating valve 9 again
When closing, the 6th measuring unit being made of second piston container 4, the second isolating valve 10 and sample cavity empty volume is pressed
Contracting or the measurement of backward travel, and calculate the total measurement (volume) V for obtaining current 6th measuring unitm6；According to formula VS=Vm6-Vm5+Vm4
It calculates and obtains sample cavity empty volume VS。
The first piston container 3, second piston container 4, valve control device, data acquisition device and data processing dress
Set specific executive mode the following hypotonic rock mine porosity measurement method the step of in be described in detail, details are not described herein again.
According to the solution of the present invention, the precision which passes through the driving of step/servo motor with high precision
The relative variation of piston control system volume replaces the relevant operation for adding standard body block in conventional solution, improves
Helium plavini volumetric measurement principle, precise measurement sample skeleton volume and sample cavity empty volume, and then realize to hole
The high-acruracy survey of degree.Without placing standard body block in the sample cavity, and the shadow of isolating valve internal volume can be shielded completely
It rings, further increases the measurement accuracy to the gas free space volumes in sample cavity empty volume and sample cavity.
Fig. 2 shows the hypotonic rocks according to an embodiment of the invention based on above-mentioned hypotonic rock mine porosity measurement system
The schematic flow chart of mine porosity measurement method.As shown in Fig. 2, the hypotonic rock mine porosity measurement method includes:
Step S100 closes intake valve, and opens vacuum valve, the first isolating valve and the second isolating valve, to the hypotonic hole Yan Kuang
Porosity measuring system vacuumizes；
Step S200, adjust first piston container and second piston container piston position so that first piston container and
The total volume and second piston volume of a container of gas free space in sample cavity are roughly equal；
Step S300 carries out opening and closing control to intake valve, vacuum valve, the first isolating valve and the second isolating valve respectively, acquisition
First piston container and second piston container in compression or backward travel at multiple positions corresponding first pressure sensor and
The pressure value of second pressure sensor acquisition；
Step S400 calculates the porosity for obtaining sample to be tested according to data collected.
Fig. 3 shows the schematic flow chart of step S400 shown in Fig. 2.As shown in figure 3, step S400 includes:
Step S410, data collected are counted when be placed in the sample cavity of sample apparatus for placing according to sample to be tested
Calculate the gas free space volumes V obtained in sample cavityFS；
Step S420, data collected obtain the vacant body of sample cavity to calculate when being moved out of sample cavity according to sample to be tested
Product VS；
Step S430 calculates the porosity φ for obtaining sample to be tested according to the following formula,
Wherein, ρVFor the apparent density of sample to be tested, m is the quality of sample to be tested.
It further include sample to be tested being placed in sample cavity, and keep the end cap of sample apparatus for placing close before step S100
It is encapsulated in one end of sample cavity.Fig. 4 shows the schematic flow chart of step S300 shown in Fig. 2.Step S300 includes:
Step S310 closes vacuum valve, opens intake valve, and in hypotonic rock mine porosity measurement system boost to default pressure
Intake valve is closed after power；
Step S320, the second isolating valve of slowly closing keep the first isolating valve to open, to by first piston container, first
The first measuring unit that gas free space volumes in isolating valve and sample cavity are constituted carries out compression or the survey of backward travel
It is fixed；
Step S330 keeps the first isolating valve to open, slowly opens the second isolating valve and keeps the work of first piston container
Fill in the second measuring unit progress that position is constant, to being made of second piston container, the second isolating valve and the first measuring unit
Compression or the measurement of backward travel；
Step S340, the first isolating valve of slowly closing, to by second piston container, the second isolating valve and sample cavity
The third measuring unit that gas free space volumes are constituted carries out compression or the measurement of backward travel.
Fig. 5 shows the schematic flow chart of step S410 shown in Fig. 3.Step S410 includes:
Step S411 calculates the total measurement (volume) V for obtaining current first measuring unit in step S320m1；
Step S412 calculates the total measurement (volume) V for obtaining current second measuring unit in step S330m2；
Step S413 calculates the total measurement (volume) V for obtaining the current third measuring unit in step S340m3；
Step S414, according to formula VFS=Vm3-Vm2+Vm1Calculate the gas free space volumes obtained in the sample cavity
VFS。
Fig. 6 shows the schematic flow chart of the schematic flow chart of step S411 shown in Fig. 5.As shown in fig. 6, the step
S411 includes:
Step S4111, to by the gas free space volumes structure in first piston container, the first isolating valve and sample cavity
At the first measuring unit carry out compression or backward travel measurement, calculate obtain first piston container original volume V10,
The internal capacity V of one isolating valvev1And the gas free space volumes V in sample cavityFSSummation V10+Vv1+VFS；
When first piston container is relative to its initial position after step S4112, measurement compression or backward travel measure
Piston displacement Δ V1f；
Step S4113, according to formula Vm1=V10+Vv1+VFS-ΔV1fCalculate the total measurement (volume) for obtaining current first measuring unit
Vm1。
Fig. 7 shows the schematic flow chart of the schematic flow chart of step S412 shown in Fig. 5.As shown in fig. 7, the step
S412 includes:
Step S4121, it is single to the second measurement being made of second piston container, the second isolating valve and the first measuring unit
Member carries out compression or the measurement of backward travel, calculates the original volume V for obtaining second piston container20, the second isolating valve inside
Volume Vv2And first measuring unit volume Vm1Summation V20+Vv2+Vm1；
When second piston container is relative to its initial position after step S4122, measurement compression or backward travel measure
Piston displacement Δ V2f；
Step S4123, according to formula Vm2=V20+Vv2+Vm1-ΔV2fCalculate the total measurement (volume) for obtaining current second measuring unit
Vm2。
Fig. 8 shows the schematic flow chart of the schematic flow chart of step S413 shown in Fig. 5.As shown in figure 8, the step
S413 includes:
Step S4131, to by the gas free space volumes structure in second piston container, the second isolating valve and sample cavity
At third measuring unit carry out compression or backward travel measurement, calculate obtain second piston container original volume V20,
The internal capacity V of two isolating valvesv2And the gas free space volumes V in sample cavityFSSummation V20+Vv2+VFS；
Step S4132, according to formula Vm3=V20+Vv2+VFS-ΔV2fCalculate the total measurement (volume) for obtaining current third measuring unit
Vm3。
It after the step s 410, further include that using vacuum valve pressure release and sample to be tested is removed into sample before step S420
Chamber re-execute the steps the as follows of S200 and step S300 shown in Fig. 9 again by end cap seal in one end of sample cavity later
Step:
Step S350 closes vacuum valve, opens intake valve, and in hypotonic rock mine porosity measurement system boost to default pressure
Intake valve is closed after power；
Step S360, the second isolating valve of slowly closing keep the first isolating valve to open, to by first piston container, first
The 4th measuring unit that isolating valve and sample cavity empty volume are constituted carries out compression or the measurement of backward travel；
Step S370 keeps the first isolating valve to open, slowly opens the second isolating valve and keeps the work of first piston container
Fill in the 5th measuring unit progress that position is constant, to being made of second piston container, the second isolating valve and the 4th measuring unit
Compression or the measurement of backward travel；
Step S380, the first isolating valve of slowly closing, to vacant by second piston container, the second isolating valve and sample cavity
The 6th measuring unit that volume is constituted carries out compression or the measurement of backward travel.
Figure 10 shows the schematic flow chart of step S420 shown in Fig. 3.As shown in Figure 10, step S420 includes:
Step S421 calculates the total measurement (volume) V for obtaining current 4th measuring unit in step S360m4；
Step S422 calculates the total measurement (volume) V for obtaining current 5th measuring unit in step S370m5；
Step S423 calculates the total measurement (volume) V for obtaining current 6th measuring unit in step S380m6；
Step S424, according to formula VS=Vm6-Vm5+Vm4It calculates and obtains sample cavity empty volume VS。
Figure 11 shows the schematic flow chart of the schematic flow chart of step S421 shown in Figure 10.As shown in figure 11, should
Step S421 includes:
Step S4211, the 4th measurement to being made of first piston container, the first isolating valve and sample cavity empty volume
Unit carries out compression or the measurement of backward travel, calculates the original volume V for obtaining first piston container10, the first isolating valve it is interior
Portion volume Vv1And sample cavity empty volume VSSummation V10+Vv1+VS；
When first piston container is relative to its initial position after step S4212, measurement compression or backward travel measure
Piston displacement Δ V1f；
Step S4213, according to formula Vm4=V10+Vv1+VS-ΔV1fCalculate the total measurement (volume) for obtaining current 4th measuring unit
Vm4。
Figure 12 shows the schematic flow chart of the schematic flow chart of step S422 shown in Figure 10.As shown in figure 12, should
Step S422 includes:
Step S4221, it is single to the 5th measurement being made of second piston container, the second isolating valve and the 4th measuring unit
Member carries out compression or the measurement of backward travel, calculates the original volume V for obtaining second piston container20, the second isolating valve inside
Volume Vv2And the 4th measuring unit volume Vm4Summation V20+Vv2+Vm4；
When second piston container is relative to its initial position after step S4222, measurement compression or backward travel measure
Piston displacement Δ V2f；
Step S4223, according to formula Vm5=V20+Vv2+Vm4-ΔV2fCalculate the total measurement (volume) for obtaining current 5th measuring unit
Vm5。
Figure 13 shows the schematic flow chart of the schematic flow chart of step S423 shown in Figure 10.As shown in figure 13, should
Step S423 includes:
Step S4231, the 6th measurement to being made of second piston container, the second isolating valve and sample cavity empty volume
Unit carries out compression or the measurement of backward travel, calculates the original volume V for obtaining second piston container20, the second isolating valve it is interior
Portion volume Vv2And sample cavity empty volume VSSummation V20+Vv2+VS；
Step S4232, according to formula Vm6=V20+Vv2+VS-ΔV2fCalculate the total measurement (volume) for obtaining current 6th measuring unit
Vm6。
Wherein, single to the first measuring unit, the second measuring unit, third measuring unit, the 4th measuring unit, the 5th measurement
Member and the 6th measuring unit carry out compression or the measurement of backward travel, obtain isolating valve volume Vv, piston container initial appearance
Product V0And sample cavity volume V to be measuredxTotal volume, wherein sample cavity volume V to be measuredxFor the gas free space in sample cavity
Volume VFSOr sample cavity empty volume VS, including following steps shown in Figure 14:
Step S1 opens isolating valve, piston container is connected to sample cavity, and vacuumizes；
Step S2, it is P that pressure is inflated into the measuring unit being made of isolating valve, piston container and sample cavity0, simultaneously
Record the initial position X of piston container at this time0；
Step S3 keeps isolating valve to open, the multiple positions taken in the shift motion of piston container, while recording piston
Container position XiCorresponding pressure reading P when variationi；
Step S4, according to formula Δ Vi=(Xi-X0) * A calculate shift motion in piston vessel volume relative variation Δ
Vi, wherein A is the sectional area of the cavity of piston component；
Step S5 is calculated according to following formula and is obtained piston vessel volume relative variation Δ V in shift motioniIt is corresponding
Pi；
Vm=V0+Vv+Vx
Wherein, Δ ViThe relative variation of piston vessel volume described in shift motion is stated to be described；
Step S6, by data point (Δ V when testingi,Pi) it is organized into uplink curve, and uplink curve is fitted, from
And obtain the original volume V of piston container0, isolating valve volume VvAnd sample cavity volume V to be measuredxSummation V0+Vv+Vx。
Figure 15 (a) shows the schematic block diagram of measuring unit shown in Figure 14 in the initial state.Figure 15 (b) is shown
Schematic block diagram of the measuring unit in compression travel shown in Figure 14.Figure 16 shows the step in method shown in Figure 14
The schematic diagram of uplink curve in rapid S6.
Wherein, when carrying out compression or the measurement of backward travel to the first measuring unit, isolating valve refers to the first isolating valve, living
Plug container refers to first piston container, and sample cavity volume to be measured is the gas free space volumes in sample cavity.
To the second measuring unit carry out compression or backward travel measurement when, isolating valve refer to the first isolating valve and second every
From valve, piston container refers to first piston container and second piston container, sample cavity volume to be measured be gas in sample cavity from
By spatial volume.
When carrying out compression or the measurement of backward travel to third measuring unit, isolating valve refers to that the second isolating valve, piston hold
Device refers to second piston container, and sample cavity volume to be measured is the gas free space volumes in sample cavity.
When carrying out compression or the measurement of backward travel to the 4th measuring unit, isolating valve refers to that the first isolating valve, piston hold
Device refers to first piston container, and sample cavity volume to be measured is sample cavity empty volume.
To the 5th measuring unit carry out compression or backward travel measurement when, isolating valve refer to the first isolating valve and second every
From valve, piston container refers to first piston container and second piston container, and sample cavity volume to be measured is sample cavity empty volume.
When carrying out compression or the measurement of backward travel to the 6th measuring unit, isolating valve refers to that the second isolating valve, piston hold
Device refers to second piston container, and sample cavity volume to be measured is sample cavity empty volume.
In the specific implementation, the method for obtaining the porosity of sample to be tested includes the following steps:
1, quality is placed in sample cavity and be the sample to be tested of m, and sample cavity end cap is reliably sealed in sample cavity one end；
2, it closes intake valve, open vacuum valve, the first isolating valve, the second isolating valve, system is vacuumized；
3, the piston position for adjusting first piston container and second piston container, makes current first piston container and sample cavity
The sum of interior gas free space volumes are substantially equal with second piston volume of a container；
4, it is then turned off vacuum valve, opens intake valve, by system boost to a certain pressure, starts thermostatic chamber temperature controller, makes
System reaches thermal balance, is then turned off intake valve.
5, the second isolating valve is slowly closed, the first isolating valve is kept to open, the step according to Figure 14 is living to first
It fills in the first measuring unit that the gas free space in container, the first isolating valve and sample cavity is constituted and carries out compression travel survey
It is fixed, obtain the summation V of this three parts volume10+VV1+VFS.When compression ends, first piston container is measured relative to initial position
Piston displacement Δ V1f, calculate the summation V of current three parts volumem1=V10+Vv1+VFS-ΔV1f；
6, it keeps the first isolating valve to open, slowly opens the second isolating valve.Keep the piston position of first piston container
It is constant, the step according to Figure 14, to second be made of second piston container, the second isolating valve and the first measuring unit
Measuring unit carries out compression travel measurement, obtains the summation V of this three parts volume20+Vv2+Vm1.When compression ends, measurement second
Piston displacement Δ V of the piston container relative to initial position2f, calculate the summation V of current three parts volumem2=V20+Vv2+
Vm1-ΔV2f；
7, the first isolating valve is slowly closed, the step according to Figure 14, to by second piston container, the second isolating valve
And the third measuring unit that the gas free space volumes in sample cavity are constituted carries out compression travel measurement, calculates when first three
The summation V of partial volumem3=V20+Vv2+VFS-ΔV2f。
8, according to formula VFS=Vm3-Vm2+Vm1Gas connection volume V in sample cavity is calculatedFSExact numerical；
9, it using vacuum valve pressure release, opens sample cavity end cap and re-assemblies sample cavity end cap after removing completely sample, so
System is vacuumized again afterwards.
10, step 3-7 is repeated, and it is vacant that the gas free space in the sample cavity in step 5-7 replaced with sample cavity
When space, to obtain Vm4、Vm5And Vm6, wherein
Vm4=V10+Vv1+VS-ΔV1f；
Vm5=V20+Vv2+Vm4-ΔV2f；
Vm6=V20+Vv2+VS-ΔV2f；
Further according to formula VS=Vm6-Vm5+Vm4Gas connection volume V in sample cavity is calculatedSExact numerical；
11, the porosity φ for obtaining the sample to be tested is calculated according to the following formula,
Wherein, ρVFor the apparent density of the sample to be tested, m is the quality of the sample to be tested.
In step 10, ideally, if being changed without sample cavity, the V in each testSNumerical value should remain unchanged.
Actually VSIt is influenced by isoperibol temperature and sample cavity assembly technology parameter, when above-mentioned two factor is controllable, more
When secondary measurement, V can be continued to useSHistorical measurements, directly skip step 10.
According to the solution of the present invention, the precision which passes through the driving of step/servo motor with high precision
The relative variation of piston control system volume replaces the relevant operation for adding standard body block in conventional solution, improves
Helium plavini volumetric measurement principle, precise measurement sample skeleton volume and sample cavity empty volume, and then realize to hole
The high-acruracy survey of degree.Without placing standard body block in the sample cavity, at most only carries out sample cavity twice and assemble, it can be complete
At entire testing process, high degree of automation, and the influence of isolating valve internal volume can be shielded completely, further increase pair
The measurement accuracy of gas free space volumes in sample cavity empty volume and sample cavity.
So far, although those skilled in the art will appreciate that present invention has been shown and described in detail herein multiple shows
Example property embodiment still without departing from the spirit and scope of the present invention, still can according to the present disclosure directly
Determine or deduce out many other variations or modifications consistent with the principles of the invention.Therefore, the scope of the present invention is understood that and recognizes
It is set to and covers all such other variations or modifications.
Claims (10)
1. a kind of hypotonic rock mine porosity measurement system, which is characterized in that including thermostatic chamber and be arranged in the thermostatic chamber
Porosity measuring device, the porosity measuring device includes:
Sample apparatus for placing has the end of the sample cavity and the sealing sample cavity for placing the sample to be tested of hypotonic rock mine
Lid；
First piston container is connected by the first isolating valve with the sample cavity；
Second piston container is connected by the second isolating valve with the sample cavity；
Vacuum valve is connected with the second piston container, is connected by second isolating valve with the sample cavity, and pass through institute
It states the first isolating valve and second isolating valve is connected with the first piston container；
Intake valve is connected with the second piston container, is connected by second isolating valve with the sample cavity, and pass through institute
It states the first isolating valve and second isolating valve is connected with the first piston container；
Valve control device, for controlling first isolating valve, second isolating valve, the vacuum valve and the intake valve
Opening and closing；
First pressure sensor is arranged between first isolating valve and the first piston container；
Second pressure sensor is arranged between second isolating valve and the intake valve；
Data acquisition device, for acquiring the first piston under the control that the valve control device opens and closes each valve
Container and the second piston container in compression or backward travel at multiple positions the corresponding first pressure sensor and
The pressure value of the second pressure sensor acquisition；
Data processing equipment, data for being acquired according to the data acquisition device calculate the hole for obtaining the sample to be tested
Porosity.
2. hypotonic rock mine porosity measurement system according to claim 1, which is characterized in that the data processing equipment is matched
The data that acquire according to the data acquisition device when the sample to be tested is placed in the sample cavity are set to calculate
Obtain the gas free space volumes V in the sample cavityFS, and moved according to the data acquisition device in the sample to be tested
The data acquired when the sample cavity out obtain the sample cavity empty volume VS to calculate, and calculate and obtain further according to following formula
The porosity φ of the sample to be tested,
Wherein, ρVFor the apparent density of the sample to be tested, m is the quality of the sample to be tested.
3. hypotonic rock mine porosity measurement system according to claim 2, which is characterized in that the data processing equipment is matched
It is set to after the sample to be tested is placed on the sample cavity, in the second isolating valve slowly closing and first isolation
When valve is opened, to by the gas free space body in the first piston container, first isolating valve and the sample cavity
The first measuring unit that product is constituted carries out compression or the measurement of backward travel, and calculates and obtain presently described first measuring unit
Total measurement (volume) Vm1；
It is keeping the first isolating valve unlatching, second isolating valve slowly to open again and is keeping the first piston container
When piston position is constant, to what is be made of the second piston container, second isolating valve and first measuring unit
Second measuring unit carries out compression or the measurement of backward travel, and calculates the total measurement (volume) for obtaining presently described second measuring unit
Vm2；
Again in the first isolating valve slowly closing, to by the second piston container, second isolating valve and described
The third measuring unit that gas free space volumes in sample cavity are constituted carries out compression or the measurement of backward travel, and calculates and obtain
Obtain the total measurement (volume) V of presently described third measuring unitm3；
According to formula VFS=Vm3-Vm2+Vm1Calculate the gas free space volumes V obtained in the sample cavityFS；
Optionally, the data processing equipment is configured to after the sample to be tested is moved out of the sample cavity, described second
When isolating valve slowly closing and first isolating valve are opened, to by the first piston container, first isolating valve and
The 4th measuring unit that the sample cavity empty volume is constituted carries out compression or the measurement of backward travel, and calculates and obtain current institute
State the total measurement (volume) V of the 4th measuring unitm4；
It is keeping the first isolating valve unlatching, second isolating valve slowly to open again and is keeping the first piston container
When piston position is constant, to what is be made of the second piston container, second isolating valve and the 4th measuring unit
5th measuring unit carries out compression or the measurement of backward travel, and calculates the total measurement (volume) for obtaining presently described 5th measuring unit
Vm5；
Again in the first isolating valve slowly closing, to by the second piston container, second isolating valve and described
The 6th measuring unit that sample cavity empty volume is constituted carries out compression or the measurement of backward travel, and calculates and obtain presently described the
The total measurement (volume) V of six measuring unitsm6；
According to formula VS=Vm6-Vm5+Vm4It calculates and obtains the sample cavity empty volume VS。
4. a kind of hypotonic rock mine porosity based on hypotonic rock mine porosity measurement system of any of claims 1-3
Measurement method, which comprises the steps of:
Intake valve is closed, and opens vacuum valve, the first isolating valve and the second isolating valve, to the hypotonic rock mine porosity measurement system
System vacuumizes；
The piston position of the first piston container and the second piston container is adjusted, so that the first piston container and institute
Total volume and the second piston volume of a container for stating the gas free space in sample cavity are roughly equal；
Opening and closing control is carried out to the intake valve, the vacuum valve, first isolating valve and second isolating valve respectively, is adopted
Collect the first piston container and the second piston container in compression or backward travel at multiple positions it is corresponding first pressure
The pressure value of force snesor and the acquisition of second pressure sensor；
The porosity for obtaining the sample to be tested is calculated according to data collected.
5. hypotonic rock mine porosity measurement method according to claim 4, which is characterized in that according to data collected come
It calculates and obtains the porosity of the sample to be tested and include:
Data collected obtain institute to calculate when be placed in the sample cavity of sample apparatus for placing according to the sample to be tested
State the gas free space volumes V in sample cavityFS；
Data collected obtain the vacant body of sample cavity to calculate when being moved out of the sample cavity according to the sample to be tested
Product VS；
The porosity φ for obtaining the sample to be tested is calculated according to the following formula,
Wherein, ρVFor the apparent density of the sample to be tested, m is the quality of the sample to be tested.
6. hypotonic rock mine porosity measurement method according to claim 5, which is characterized in that in the closing intake valve,
And vacuum valve, the first isolating valve and the second isolating valve are opened, before being vacuumized to the hypotonic rock mine porosity measurement system, also
Including the sample to be tested to be placed in the sample cavity, and make the end cap seal of the sample apparatus for placing in the sample
One end of chamber；
At this point, described open the intake valve, the vacuum valve, first isolating valve and second isolating valve respectively
Control is closed, it is corresponding at multiple positions in compression or backward travel to acquire the first piston container and the second piston container
First pressure sensor and second pressure sensor acquisition pressure value, include the following steps:
The vacuum valve is closed, opens intake valve, and after the hypotonic rock mine porosity measurement system boost to preset pressure
Close the intake valve；
Second isolating valve described in slowly closing keeps first isolating valve to open, to by the first piston container, described the
The first measuring unit that gas free space volumes in one isolating valve and the sample cavity are constituted carries out compression or rear regression
The measurement of journey, and calculate the total measurement (volume) V for obtaining presently described first measuring unitm1；
It keeps first isolating valve to open, slowly open second isolating valve and keep the piston of the first piston container
Position is constant, surveys to second be made of the second piston container, second isolating valve and first measuring unit
Amount unit carries out compression or the measurement of backward travel, and calculates the total measurement (volume) V for obtaining presently described second measuring unitm2；
First isolating valve described in slowly closing, to by the second piston container, second isolating valve and the sample cavity
The third measuring unit that interior gas free space volumes are constituted carries out compression or the measurement of backward travel, and it is current to calculate acquisition
The total measurement (volume) V of the third measuring unitm3；
Optionally, described that the gas free space volumes V obtained in the sample cavity is calculated according to data collectedFSStep
In rapid, according to formula VFS=Vm3-Vm2+Vm1Calculate the gas free space volumes V obtained in the sample cavityFS。
7. hypotonic rock mine porosity measurement method according to claim 5, which is characterized in that it is described according to test sample
Product when being placed in the sample cavity of sample apparatus for placing data collected come calculate obtain gas in the sample cavity from
By spatial volume VFSIt later, further include removing the sample cavity using the vacuum valve pressure release and by the sample to be tested, again
By the end cap seal in one end of the sample cavity；
At this point, described open the intake valve, the vacuum valve, first isolating valve and second isolating valve respectively
Control is closed, it is corresponding at multiple positions in compression or backward travel to acquire the first piston container and the second piston container
First pressure sensor and second pressure sensor acquisition pressure value, include the following steps:
Second isolating valve described in slowly closing keeps first isolating valve to open, to by the first piston container, described the
The 4th measuring unit that one isolating valve and the sample cavity empty volume are constituted carries out compression or the measurement of backward travel, and counts
Calculate the total measurement (volume) V for obtaining presently described 4th measuring unitm4；
It keeps first isolating valve to open, slowly open second isolating valve and keep the piston of the first piston container
Position is constant, surveys to the 5th be made of the second piston container, second isolating valve and the 4th measuring unit
Amount unit carries out compression or the measurement of backward travel, and calculates the total measurement (volume) V for obtaining presently described 5th measuring unitm5；
First isolating valve described in slowly closing, to by the second piston container, second isolating valve and the sample cavity
The 6th measuring unit that empty volume is constituted carries out compression or the measurement of backward travel, and calculates and obtain presently described 6th measurement
The total measurement (volume) V of unitm6；
Optionally, the data collected when being moved out of the sample cavity according to the sample to be tested obtain the sample to calculate
Product chamber empty volume VSThe step of in, according to formula VS=Vm6-Vm5+Vm4It calculates and obtains the sample cavity empty volume VS。
8. hypotonic rock mine porosity measurement method according to claim 6, which is characterized in that hold to by the first piston
The first measuring unit that gas free space volumes in device, first isolating valve and the sample cavity are constituted is compressed
Or the measurement of backward travel, and calculate the total measurement (volume) V for obtaining presently described first measuring unitm1, include the following steps:
It is constituted to by the gas free space volumes in the first piston container, first isolating valve and the sample cavity
The first measuring unit carry out compression or the measurement of backward travel, calculate the original volume V for obtaining the first piston container10、
The internal capacity V of first isolating valvev1And the gas free space volumes V in the sample cavityFSSummation V10+Vv1+
VFS；
Piston displacement when the first piston container is relative to its initial position after measurement compression or backward travel measure
ΔV1f；
According to formula Vm1=V10+Vv1+VFS-ΔV1fCalculate the total measurement (volume) V for obtaining presently described first measuring unitm1；
Optionally, to second be made of the second piston container, second isolating valve and first measuring unit
Measuring unit carries out compression or the measurement of backward travel, and calculates the total measurement (volume) V for obtaining presently described second measuring unitm2, packet
Include following steps:
To the second measuring unit being made of the second piston container, second isolating valve and first measuring unit
Compression or the measurement of backward travel are carried out, the original volume V for obtaining the second piston container is calculated20, second isolating valve
Internal capacity Vv2And the volume V of first measuring unitm1Summation V20+Vv2+Vm1；
Piston displacement when the second piston container is relative to its initial position after measurement compression or backward travel measure
ΔV2f；
According to formula Vm2=V20+Vv2+Vm1-ΔV2fCalculate the total measurement (volume) V for obtaining presently described second measuring unitm2；
Optionally, to by the gas free space in the second piston container, second isolating valve and the sample cavity
The third measuring unit that volume is constituted carries out compression or the measurement of backward travel, and calculates and obtain presently described third measuring unit
Total measurement (volume) Vm3, include the following steps:
It is constituted to by the gas free space volumes in the second piston container, second isolating valve and the sample cavity
Third measuring unit carry out compression or the measurement of backward travel, calculate the original volume V for obtaining the second piston container20、
The internal capacity V of second isolating valvev2And the gas free space volumes V in the sample cavityFSSummation V20+Vv2+
VFS；
According to formula Vm3=V20+Vv2+VFS-ΔV2fCalculate the total measurement (volume) V for obtaining presently described third measuring unitm3；
Optionally, to be made of the first piston container, first isolating valve and the sample cavity empty volume
Four measuring units carry out compression or the measurement of backward travel, and calculate the total measurement (volume) V for obtaining presently described 4th measuring unitm4,
Include the following steps:
It is single to the 4th measurement being made of the first piston container, first isolating valve and the sample cavity empty volume
Member carries out compression or the measurement of backward travel, calculates the original volume V for obtaining the first piston container10, it is described first isolation
The internal capacity V of valvev1And the sample cavity empty volume VSSummation V10+Vv1+VS；
Piston displacement when the first piston container is relative to its initial position after measurement compression or backward travel measure
ΔV1f；
According to formula Vm4=V10+Vv1+VS-ΔV1fCalculate the total measurement (volume) V for obtaining presently described 4th measuring unitm4；
Optionally, to the 5th be made of the second piston container, second isolating valve and the 4th measuring unit
Measuring unit carries out compression or the measurement of backward travel, and calculates the total measurement (volume) V for obtaining presently described 5th measuring unitm5, packet
Include following steps:
To the 5th measuring unit being made of the second piston container, second isolating valve and the 4th measuring unit
Compression or the measurement of backward travel are carried out, the original volume V for obtaining the second piston container is calculated20, second isolating valve
Internal capacity Vv2And the volume V of the 4th measuring unitm4Summation V20+Vv2+Vm4；
Piston displacement when the second piston container is relative to its initial position after measurement compression or backward travel measure
ΔV2f；
According to formula Vm5=V20+Vv2+Vm4-ΔV2fCalculate the total measurement (volume) V for obtaining presently described 5th measuring unitm5；
Optionally, to be made of the second piston container, second isolating valve and the sample cavity empty volume
Six measuring units carry out compression or the measurement of backward travel, and calculate the total measurement (volume) V for obtaining presently described 6th measuring unitm6,
Include the following steps:
It is single to the 6th measurement being made of the second piston container, second isolating valve and the sample cavity empty volume
Member carries out compression or the measurement of backward travel, calculates the original volume V for obtaining the second piston container20, it is described second isolation
The internal capacity V of valvev2And the sample cavity empty volume VSSummation V20+Vv2+VS；
According to formula Vm6=V20+Vv2+VS-ΔV2fCalculate the total measurement (volume) V for obtaining presently described 6th measuring unitm6。
9. hypotonic rock mine porosity measurement method according to claim 8, which is characterized in that single to first measurement
First, described second measuring unit, the third measuring unit, the 4th measuring unit, the 5th measuring unit and institute
It states the 6th measuring unit and carries out compression or the measurement of backward travel, obtain isolating valve volume Vv, piston container original volume V0With
And the sample cavity volume V to be measuredxTotal volume, wherein the sample cavity volume V to be measuredxCertainly for the gas in the sample cavity
By spatial volume VFSOr the sample cavity empty volume VS, include the following steps:
Isolating valve is opened, piston container is connected to sample cavity, and vacuumizes；
It is P that pressure is inflated into the measuring unit being made of the isolating valve, the piston container and the sample cavity0, simultaneously
Record the initial position X of the piston container at this time0；
The isolating valve is kept to open, the multiple positions taken in the shift motion of the piston container, while recording the work
Fill in container position XiCorresponding pressure reading P when variationi；
According to formula Δ Vi=(Xi-X0) * A calculates piston vessel volume relative variation Δ V described in the shift motioni,
In, A is the sectional area of the cavity of piston component；
It calculates and obtains piston vessel volume relative variation Δ V described in the shift motioniCorresponding Pi；
By data point (Δ V when testingi,Pi) it is organized into uplink curve, and the uplink curve is fitted, to obtain
The original volume V of the piston container0, the isolating valve volume VvAnd the sample cavity volume V to be measuredxSummation V0+Vv+
Vx；
Optionally, when carrying out compression or the measurement of backward travel to first measuring unit, the isolating valve refers to described the
One isolating valve, the piston container refer to the first piston container, and the sample cavity volume to be measured is in the sample cavity
Gas free space volumes；
Optionally, when carrying out compression or the measurement of backward travel to second measuring unit, the isolating valve refers to described the
One isolating valve and second isolating valve, the piston container refer to the first piston container and the second piston container,
The sample cavity volume to be measured is the gas free space volumes in the sample cavity；
Optionally, when carrying out compression or the measurement of backward travel to the third measuring unit, the isolating valve refers to described the
Two isolating valves, the piston container refer to the second piston container, and the sample cavity volume to be measured is in the sample cavity
Gas free space volumes；
Optionally, when carrying out compression or the measurement of backward travel to the 4th measuring unit, the isolating valve refers to described the
One isolating valve, the piston container refer to the first piston container, and the sample cavity volume to be measured is that the sample cavity is vacant
Volume；
Optionally, when carrying out compression or the measurement of backward travel to the 5th measuring unit, the isolating valve refers to described the
One isolating valve and second isolating valve, the piston container refer to the first piston container and the second piston container,
The sample cavity volume to be measured is the sample cavity empty volume；
Optionally, when carrying out compression or the measurement of backward travel to the 6th measuring unit, the isolating valve refers to described the
Two isolating valves, the piston container refer to the second piston container, and the sample cavity volume to be measured is that the sample cavity is vacant
Volume.
10. hypotonic rock mine porosity measurement method according to claim 9, which is characterized in that described in the calculating obtains
The relative variation Δ of piston vessel volume described in shift motion ViCorresponding pressure Pi, calculated according to following formula and obtain pressure
Pi:
Vm=V0+Vv+Vx
Wherein, Δ ViThe relative variation of piston vessel volume described in shift motion is stated to be described.
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