CN103575629B - A kind of rock sample volume testing system and gas permeation monitoring method - Google Patents
A kind of rock sample volume testing system and gas permeation monitoring method Download PDFInfo
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- CN103575629B CN103575629B CN201210273356.3A CN201210273356A CN103575629B CN 103575629 B CN103575629 B CN 103575629B CN 201210273356 A CN201210273356 A CN 201210273356A CN 103575629 B CN103575629 B CN 103575629B
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Abstract
The invention discloses a kind of rock sample volume testing system and gas infiltration monitoring method.System comprises: source of the gas, reference cell, rock sample room, pressure transducer, valve A, valve B and valve C, is arranged in closed case by valve B, reference cell, pressure transducer, valve C and rock sample room, and the side cabinet near rock sample room is provided with door; In cabinet or cabinet be outside equipped with tracer gas monitoring device; Cabinet is outside equipped with computing machine, is connected respectively with pressure transducer and tracer gas monitoring device.Method comprises: in rock sample volume test process, whether seepage occurs by system in tracer gas monitoring device monitoring cabinet; Work as pressure drop, when the trace gas concentration that tracer gas monitoring device detects exceedes tracer gas content in air, computing machine is reported to the police.The present invention can make system be in real-time monitor state, and Timeliness coverage seepage, increases work efficiency, and ensures measuring accuracy.
Description
Technical field
The present invention relates to geology field, say further, relate to a kind of rock sample volume testing system and gas permeation monitoring method.
Background technology
In rock sample porosity determination process, gas method is a kind of comparatively ripe method measuring rock sample entity (skeleton) volume.Its principle is: according to Boyle's law, the ideal gas of certain mass, and when temperature-resistant, its pressure and volume are inversely proportional to.Reference cell and rock sample room are linked by pipeline, pipeline is equipped with gas pressure sensor (or tensimeter) and valve, when loading certain pressure (P in reference cell
1) gas (air or nitrogen etc.), under isothermal conditions, deliver gas in rock sample room, gaseous tension will decline, until balance, pressure is now called equalized pressure (P
2).
Now, following formula is set up:
P
1*V
1=P
2*（V
2+V
1）-------------------------------------------（1）
Wherein: V
1for line volume sum between reference cell and reference cell to valve;
V
2for line volume sum between rock sample room and rock sample room to valve;
When being V by solid volume
3rock sample when putting into rock sample room, repeat said process, following formula is set up:
P
1*V
1=P
2*（V
2+V
1－V
3）
V
3=V
2+V
1-P
1*V
1/P
2------------------------------------------（2）
As can be seen here, due to V
2, V
1and P
1be known, as long as record the equalized pressure P after loading rock sample
2, rock sample solid volume can be calculated with formula (2), equalized pressure P
2it is the key parameter accurately calculating rock sample solid volume.
Operating process (see accompanying drawing) is:
(1) close at valve A, under the state opened of valve B, C, take off rock sample room top cover, rock sample is put into rock sample room, install and step up top cover;
(2) valve-off C, opens valve A, valve B, makes gas enter reference cell, and reach certain pressure;
(3) valve-off B, opens valve C, and now gas constantly enters into the hole of rock sample room and rock sample, and gaseous tension declines, and under the condition not having gas permeation, pressure reaches balance after after a while, and the pressure now recorded is equalized pressure;
From principle and operating process, the advantage of this method is that apparatus structure is simple, easy and simple to handle.But also there is certain defect and risk.
1. reference cell and rock sample room are linked by pipeline, and with pressure transducer (or tensimeter), valve on pipeline, rock sample room, with movable top cover, in operation, exists the risk of gas permeation, once there is seepage, will affect the accurate detection of equalized pressure;
2. in operating process (3), different because of rock sample, there is very large difference the pressure time reached required for balance, the only a few minutes had, and the dozens of minutes that needs had just can reach balance.Be in the process, that gas there occurs seepage? or normal equilibrium process? operating personnel are difficult to judge, cause work efficiency, even test mass to be affected.
For this reason, be starved of a kind of gas permeation monitoring method, make the critical component of instrument and the sealing property of point of contact thereof be in real-time monitor state, to ensure work efficiency and test mass.
Summary of the invention
For solving problems of the prior art, the invention provides a kind of rock sample volume testing system and gas permeation monitoring method.System can be made to be in real-time monitor state, and Timeliness coverage seepage, increases work efficiency, and ensures measuring accuracy.
An object of the present invention is to provide a kind of rock sample volume testing system.
Comprise: source of the gas, reference cell, rock sample room, pressure transducer, valve A, valve B and valve C, source of the gas connects reference cell and rock sample room successively, pressure transducer and valve C are arranged on the pipeline between reference cell and rock sample room, valve A and valve B is arranged on the pipeline between source of the gas and reference cell
Be arranged in closed case by valve B, reference cell, pressure transducer, valve C and rock sample room, the side cabinet near rock sample room is provided with door, can pick and place rock sample;
In described cabinet or cabinet be outside equipped with tracer gas monitoring device;
Described cabinet is outside equipped with computing machine, is connected respectively with pressure transducer and tracer gas monitoring device.
Two of object of the present invention is to provide gas permeation monitoring method in a kind of rock sample volume test process.
Comprise:
In rock sample volume test process, whether there is seepage by system in tracer gas monitoring device monitoring cabinet;
Work as pressure drop, when the trace gas concentration that tracer gas monitoring device detects exceedes the content of tracer gas in air, computing machine is reported to the police.
Specifically comprise the following steps:
(1) open the door of cabinet, rock sample is put into rock sample room bonnet and press closer lid;
(2) valve-off C, open valve A, valve B, the gas containing tracer gas enters reference cell; When pressure reaches 0.1-0.5MPa, valve-off B, open valve C, close machine box door, cabinet is sealed; Tracer gas and measuring media enter in rock sample room and rock sample hole;
(3) pressure drop, when the trace gas concentration that tracer gas monitoring device detects does not exceed the content of tracer gas in air, show do not have seepage in system, pressure reaches balance gradually, gathers equalized pressure data, computer calculate testing result;
(4) work as pressure drop, when the trace gas concentration variable quantity that tracer gas monitoring device detects exceedes tracer gas content in air, computing machine is reported to the police, and in illustrative system, gas permeation occurs.
Technical scheme of the present invention is as follows:
One is be positioned in the casing of an opposing seal by the pipeline involved by reference cell, rock sample room, confined gas and valve etc., and this casing can be the cabinet of opposing seal, and there is door in front, conveniently puts into taking-up rock sample; Two is be mixed into a certain amount of tracer gas in measurement gas medium, and this tracer gas in an atmosphere content is low, is easy to detect, and is generally helium, sulfur hexafluoride (SF
6), when taking air as measuring media, select helium; Can SF be selected with helium as during measuring media
6; Three is at box house or outside installation trace gas detection device, the concentration change of tracer gas in Real-Time Monitoring, display casing; Four is arrange trace gas concentration variable quantity alarming value, once trace gas concentration variable quantity reaches the lower limit of alarming value, shows gas generation seepage, computing machine and alarm, rock sample then should be stopped to test, check pipeline, determine leak location, carry out encapsulation process.When gaseous tension decline, computing machine is not reported to the police, and illustrate that gas just slowly enters among the micro-pore of rock sample, Instrument working state is normal, pressure changing of can feeling at ease to observe, until pressure equilibrium.
Specifically can adopt following steps:
1. the door of cabinet is opened;
2. take off rock sample room top cover rock sample to be put into rock sample room bonnet and press closer lid;
3. valve-off C, open valve A, valve B, the gas containing tracer gas enters reference cell; When pressure reaches 0.1-0.5MPa, valve-off B, open valve C, close the door of cabinet;
4. tracer gas and measuring media enter in rock sample room and rock sample hole.
5. when pipeline and with valve, pressure transducer, reference cell, junction, rock sample room good seal, pressure drop, the trace gas concentration that tracer gas monitoring device detects does not have ANOMALOUS VARIATIONS, show that working state of system is good, after a period of time, pressure will reach balance, gather equalized pressure data, computer calculate testing result.
6. open the door of cabinet, take out rock sample, so far, complete a rock sample solid volume and measure.
7. pressure drop is worked as, when the trace gas concentration that tracer gas monitoring device detects exceedes tracer gas content in air, computing machine is reported to the police, illustrative system generation gas (measuring media) seepage, current rock sample then should be stopped to detect, check pipeline and with each parts junction, search breakthrough and repair.
Be further described with reference to Fig. 1:
Valve A is the valve containing tracer gas source of the gas, valve B is reference cell air intake valve, reference cell is the cavity with fixed volume, pressure transducer is for detecting reference cell gaseous tension and gas enters the equalized pressure behind rock sample room, valve C is rock sample room air intake valve, rock sample room is for placing rock sample, its top is with top cover, for placing rock sample bonnet tightening seal, tracer gas monitoring device is used for the monitoring of tracer gas, and computing machine is used for the data sampling and processing, display etc. of pressure parameter, tracer gas monitoring.
Valve B, reference cell, pressure transducer, valve C, rock sample room and top cover thereof are all positioned in the casing of relative closure.In test process, when pipeline and with valve, pressure transducer, reference cell, junction, rock sample room good seal, pressure drop, the trace gas concentration that tracer gas monitoring device detects does not have ANOMALOUS VARIATIONS, show that working state of system is good, after a period of time, pressure will reach balance; Work as pressure drop, when the trace gas concentration that tracer gas monitoring device detects exceedes tracer gas content in air, computing machine meeting alarm, illustrative system generation gas (measuring media) seepage, current rock sample then should be stopped to detect, check pipeline and with each parts junction, search breakthrough and repair.
Technical Design of the present invention is reasonable, makes full use of original resource that gas method measures rock sample solid volume, and suitably expansion increase hardware and software can be implemented.After the invention process, gas method can be made to measure the sealing property of the critical component of rock sample volume, be in real-time monitor state, guarantee key parameter--equalized pressure accurately and reliably, for raising factor of porosity measuring accuracy and work efficiency significant.
Accompanying drawing explanation
Fig. 1 rock sample volume testing system of the present invention schematic diagram
Description of reference numerals:
1-valve A; 2-valve B; 3-pressure transducer; 4-reference cell; 5-valve C
6-rock sample room; 7-top cover; 8-cabinet; 9-tracer gas monitoring device; 10-computing machine; 11-source of the gas;
Embodiment
Below in conjunction with embodiment, further illustrate the present invention.
Embodiment:
As shown in Figure 1, a kind of rock sample volume testing system, comprise: source of the gas 11, reference cell 4, rock sample room 6, pressure transducer 3, valve A1, valve B2 and valve C5, source of the gas 11 connects reference cell 4 and rock sample room 7 successively, pressure transducer 3 and valve C5 are arranged on the pipeline between reference cell 4 and rock sample room 6, valve A1 and valve B2 is arranged on the pipeline between source of the gas 11 and reference cell 4
Be arranged in closed case 8 by valve B2, reference cell 4, pressure transducer 3, valve C5 and rock sample room 6, the side cabinet near rock sample room 6 is provided with door, can pick and place rock sample;
In described cabinet or cabinet be outside equipped with tracer gas monitoring device 9;
Described cabinet is outside equipped with computing machine 10, is connected respectively with pressure transducer 3 and tracer gas monitoring device 9.
When carrying out the test of rock sample volume,
1. the door of cabinet is opened;
2. take off rock sample room top cover rock sample to be put into rock sample room bonnet and press closer lid;
3. valve-off C, open valve A, valve B, the gas containing tracer gas enters reference cell; When pressure reaches 0.5MPa, valve-off B, open valve C, close the door of cabinet;
4. tracer gas helium and measuring media enter in rock sample room and rock sample hole.
5. when pipeline and with valve, pressure transducer, reference cell, junction, rock sample room good seal, pressure drop, the trace gas concentration that tracer gas monitoring device detects does not have ANOMALOUS VARIATIONS, show that working state of system is good, after 2 minutes, pressure will reach balance, gather equalized pressure data, computer calculate testing result.
6. open the door of cabinet, take out rock sample, so far, complete a rock sample solid volume and measure.
7. pressure drop is worked as, when the trace gas concentration that tracer gas monitoring device detects exceedes tracer gas content in air, computing machine is reported to the police, illustrative system generation gas (measuring media) seepage, current rock sample then should be stopped to detect, check pipeline and with each parts junction, search breakthrough and repair.
Claims (5)
1. a rock sample volume testing system, comprise: containing the source of the gas of tracer gas, reference cell, rock sample room, pressure transducer, valve A, valve B and valve C, source of the gas connects reference cell and rock sample room successively, pressure transducer and valve C are arranged on the pipeline between reference cell and rock sample room, valve A and valve B is arranged on the pipeline between source of the gas and reference cell, it is characterized in that:
Be arranged in closed case by valve B, reference cell, pressure transducer, valve C and rock sample room, the side cabinet near rock sample room is provided with door, can pick and place rock sample;
In described cabinet or cabinet be outside equipped with tracer gas monitoring device, the concentration change of the tracer gas in described closed case monitored by described tracer gas monitoring device, whether seepage occurs to monitor system in described closed case.
2. rock sample volume testing system as claimed in claim 1, is characterized in that:
Described cabinet is outside equipped with computing machine, is connected respectively with pressure transducer and tracer gas monitoring device.
3. adopt a gas permeation monitoring method for rock sample volume testing system as claimed in claim 1 or 2, comprising:
In rock sample volume test process, whether there is seepage by system in tracer gas monitoring device monitoring cabinet.
4. gas permeation monitoring method as claimed in claim 3, is characterized in that:
Work as pressure drop, when the trace gas concentration that tracer gas monitoring device detects exceedes tracer gas content in air, computing machine is reported to the police.
5. gas permeation monitoring method as claimed in claim 4, is characterized in that said method comprising the steps of:
(1) open the door of cabinet, rock sample is put into rock sample room bonnet and press closer lid;
(2) valve-off C, open valve A, valve B, the gas containing tracer gas enters reference cell; When pressure reaches 0.1-0.5MPa, valve-off B, open valve C, close machine box door, cabinet is sealed; Tracer gas and measuring media enter in rock sample room and rock sample hole;
(3) pressure drop, when the trace gas concentration that tracer gas monitoring device detects does not exceed tracer gas content in air, show do not have seepage in system, pressure reaches balance gradually, gathers equalized pressure data, computer calculate testing result;
(4) work as pressure drop, when the trace gas concentration that tracer gas monitoring device detects exceedes tracer gas content in air, computing machine is reported to the police, and in illustrative system, gas permeation occurs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210273356.3A CN103575629B (en) | 2012-08-02 | 2012-08-02 | A kind of rock sample volume testing system and gas permeation monitoring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210273356.3A CN103575629B (en) | 2012-08-02 | 2012-08-02 | A kind of rock sample volume testing system and gas permeation monitoring method |
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|---|---|
| CN103575629A CN103575629A (en) | 2014-02-12 |
| CN103575629B true CN103575629B (en) | 2016-03-02 |
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| CN109521164A (en) * | 2018-12-28 | 2019-03-26 | 上海勘察设计研究院(集团)有限公司 | Thick wall body crosscutting concern detection system and method |
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