CN104897514A - Device for measuring danks surface gas adsorption and danks desorption curves - Google Patents

Device for measuring danks surface gas adsorption and danks desorption curves Download PDF

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Publication number
CN104897514A
CN104897514A CN201510319609.XA CN201510319609A CN104897514A CN 104897514 A CN104897514 A CN 104897514A CN 201510319609 A CN201510319609 A CN 201510319609A CN 104897514 A CN104897514 A CN 104897514A
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China
Prior art keywords
gas
danks
pressure
vacuum pump
monitoring
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CN201510319609.XA
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Chinese (zh)
Inventor
徐春碧
张旭
戚志林
雷登生
曾顺朋
张仕峰
刘建军
杨得圃
焦国盈
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徐春碧
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Priority to CN201510319609.XA priority Critical patent/CN104897514A/en
Publication of CN104897514A publication Critical patent/CN104897514A/en

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Abstract

The invention discloses a device for measuring danks surface gas adsorption and danks desorption curves. The device comprises a super constant temperature box, a gas path system and a monitoring system, wherein the gas path system comprises a high-pressure to-be-measured gas cylinder, a vacuum pump, a helium gas cylinder and an adsorption tank; the monitoring system comprises an inlet end high-precision gas mass flow meter, a system pressure sensor which are arranged at the gas inlet end of the adsorption tank, and a temperature sensor and an outlet end high-precision gas mass flow meter which are arranged at the gas outlet end of the adsorption tank; the monitoring system is externally connected to a computer; the adsorption tank and the temperature sensor are arranged in the super constant temperature box. According to the device for measuring danks surface gas adsorption and danks desorption curves, the automatic collection and recording of methane desorption data can be realized, the measurement accuracy is greatly improved, and through calculation of the computer, the accuracy is improved, and the methane adsorption/desorption dynamic process can be accurately reflected.

Description

A kind of device measuring the absorption of danks surface gas and danks desorption curve
Technical field
The present invention relates to a kind of device measuring the absorption of danks surface gas and danks desorption curve.
Background technology
Due to the reservoir characteristics of coal petrography and mud shale, determine under certain pressure condition, have high adsorption, the recovery process of coal-seam gas and shale gas to gases such as the methane be stored in wherein, it is exactly in fact coal petrography and mud shale to the desorption process of hydrocarbon gas being adsorbed on its surface.Therefore, understand fully coal petrography and the mud shale adsorption and desorption mechanism for hydrocarbon gas, significant to the reasonable development of coal-seam gas and shale gas.
To the understanding of coal petrography and mud shale adsorption and desorption mechanism, the most substantially, the most direct research means is exactly Lab-evaluation.
Current mensuration gas desorption experiment device can be divided into two classes, and one is gravimetric method, and two is volumetric methods.Gravimetric method experimental precision is higher, but to bear pressure less for device, and under being not suitable with high pressure, desorption of mash gas measures, and gravimetric method adopts coal/shale sample less, can not reflect desorption of mash gas intrinsic propesties in coal/shale.Volumetric method is widely used now, but experiment coal/shale sample amount also on the low side and can experimental repeatability poor.For large quality coal/shale sample, require that the reaction time is short, data acquisition amount is large, and precision is high, can bear the desorption of mash gas experiment under elevated pressures.
Summary of the invention
An object of the present invention is the difficult problem that can not reflect often kind of desorption of mash gas essential characteristic for solving conventional apparatus, provides a kind of and effectively can improve the mensuration danks surface gas absorption of accuracy and the device of danks desorption curve.
The invention provides a kind of device measuring the absorption of danks surface gas and danks desorption curve, comprise super constant temperature oven, air-channel system and monitoring system:
Described air-channel system comprises high pressure gas cylinder to be measured, vacuum pump, helium tank and adsorption tanks, described high pressure gas cylinder to be measured, vacuum pump and helium tank are connected to described adsorption tanks by Trunk Line, the outlet side of described high pressure gas cylinder to be measured is connected with described vacuum pump by high pressure bottle valve to be measured, and is connected to the inlet end of described adsorption tanks by the first valve; The outlet side of described helium tank is connected on described Trunk Line by helium tank outlet valve;
Described monitoring system comprises inlet end high-precision gas mass flowmeter, the system pressure sensor of being located at adsorption tanks inlet end and is located at temperature sensor and the endpiece high-precision gas mass flowmeter of described adsorption tanks outlet side, and described monitoring system is external to computing machine;
Described adsorption tanks and temperature sensor are located in described super constant temperature oven.
Further, described monitoring system also comprises: be located at the vacuum pump pressure sensor on vacuum pump.
Further, described vacuum pump is also provided with vacuum pump high-grade pressure gauge, the inlet end high-grade pressure gauge on described Trunk Line.
Beneficial effect of the present invention is, a kind of device measuring the absorption of danks surface gas and danks desorption curve provided by the invention, achieve automatic collection and the record of coal/shale surface gas absorption and desorption data, substantially increase the accuracy of mensuration, and by computer calculate, improve accuracy.The dynamic process of gas/shale gas absorption and desorb can be reflected accurately.This device pressure scope of application can reach 50MPa, actual close to producing, and has more guiding value; Adopt drainage metering absorption and gas desorption quantity, test result is more accurate; Adopt automatic monitoring system, can real-time dynamic monitoring be realized, reflect the pressure-dependent essence of adsorption and desorption process.
Accompanying drawing explanation
Figure 1 shows that a kind of structural drawing measuring the device of the absorption of danks surface gas and danks desorption curve of the present invention.
Embodiment
Hereafter will describe the specific embodiment of the invention in detail in conjunction with concrete accompanying drawing.It should be noted that the combination of technical characteristic or the technical characteristic described in following embodiment should not be considered to isolated, they can mutually be combined thus be reached better technique effect.
As shown in Figure 1, the invention provides a kind of device measuring the absorption of danks surface gas and danks desorption curve, comprise super constant temperature oven, air-channel system and monitoring system:
Air-channel system comprises high pressure gas cylinder 5 to be measured, vacuum pump 4, helium tank 6 and adsorption tanks 1, high pressure gas cylinder 5 to be measured, vacuum pump 4 and helium tank 6 are connected to adsorption tanks 1 by Trunk Line, the outlet side of high pressure gas cylinder to be measured 5 is connected with vacuum pump 4 by high pressure bottle valve to be measured, and vacuum pump 4 is connected to the inlet end of adsorption tanks 1 by the first valve; The outlet side of helium tank 6 is connected on Trunk Line by helium tank outlet valve;
Monitoring system comprises inlet end high-precision gas mass flowmeter 7, the system pressure sensor 8 of being located at adsorption tanks 1 inlet end and is located at temperature sensor 3 and the endpiece high-precision gas mass flowmeter 9 of adsorption tanks 1 outlet side, and monitoring system is external to computing machine;
Adsorption tanks 1 and temperature sensor 3 are located in super constant temperature oven 2.
Further, monitoring system also comprises: be located at the vacuum pump pressure sensor 11 on vacuum pump 4.
Further, vacuum pump 4 is also provided with vacuum pump high-grade pressure gauge 12, and Trunk Line is provided with inlet end high-grade pressure gauge 10.
Embodiment:
Coal petrography or shale samples test specimen are loaded in adsorption tanks 1, connect super constant temperature oven 2 power supply, according to actual formation temperature setting experimental temperature 23 DEG C, temperature in adsorption tanks 1 is monitored by the temperature sensor 3 of outlet side, after arrangement, close vacuum pump 4 valve, high pressure bottle valve to be measured, open helium tank outlet valve, helium tank outlet valve is closed be filled with a certain amount of helium in system after, after pressure stabilisationly to change every 1h register system pressure, if system pressure is without significant change in 6h, then illustrate that impermeability is good; If system pressure change obviously, illustrate that impermeability is poor, need reexamine and assemble experimental provision.
If impermeability is good, then open vacuum pump 4, open vacuum pump valve, carry out degassed to sample specimens, in order to eliminate the impact of coal sample absorbed air on test findings, degassing time is 3-6h, until system pressure is without significant change, close vacuum pump 4 and vacuum pump valve, open helium tank outlet valve, be filled with the helium of a certain amount of purity > 99.999% to adsorption tanks 1 after, after system pressure is stable, measure respectively by inlet end high-precision gas mass flowmeter 7 and system pressure sensor 8 and record the methane gas quality and system pressure that are filled with, according to the free space volumes of formula (1) computing system, repeat experiment three times, average as free space volumes,
V free = ZmR pM - - - ( 1 )
Open vacuum pump 4, open vacuum pump valve, system is vacuumized, duration is about 6h, until pressure is without significant change, close vacuum pump 4 and vacuum pump valve, open inlet end high-precision gas mass flowmeter 7 power switch, regulate high pressure gas cylinder 5 to be measured, the methane gas of purity > 99.99% is filled with in system, to experimental design pressure, close high pressure gas cylinder 5 to be measured and to give vent to anger valve, record the quality of insufflation gas according to inlet end high-precision gas mass flowmeter 7; After system pressure balance (time is generally 24-48h), record the system pressure after balance by system pressure sensor 8, calculate according to formula (2) and record adsorbed gas volume corresponding to this equalized pressure; Improve system experimentation pressure successively, adsorption tanks 1 are filled with methane gas, and adsorption equilibrium pressure is increased gradually, can record the adsorption isothermal curve of methane in coal petrography.
V ad = Z 0 m i R T 0 p 0 M - 0.0224 p V free ZRT - - - ( 2 )
Until after reaching the highest contrived experiment force value, desorption experiment process is carried out by adsorption isotherm experiment repeatedly.Close inlet end high-precision gas mass flowmeter 7 power switch, open endpiece high-precision gas mass flowmeter 9 power switch, slow unlatching endpiece venting valve, release part methane gas to experimental design pressure, close venting valve, the quality of gas is released according to endpiece high-precision gas mass flowmeter 9 record, after system pressure balance (time is generally 24-48h), record the system pressure after balance by system pressure sensor 8, calculate the adsorbed gas scale of construction in desorption process according to formula (3).Repeat the operation discharging methane gas, and calculate according to formula (3) and methane adsorption amount corresponding under recording this equalized pressure, successively reduce system experimentation pressure to test, until reach minimum experimental pressure, desorption process methane adsorption isothermal curve can be drawn.
V ad = Z 0 ( m t - m 0 ) R T 0 p 0 M - 0.0224 p V free ZRT - - - ( 3 )
A kind of device measuring the absorption of danks surface gas and danks desorption curve provided by the invention, achieve automatic collection and the record of coal/shale surface gas absorption and desorption data, substantially increase the accuracy of mensuration, and by computer calculate, improve accuracy.The dynamic process of gas/shale gas absorption and desorb can be reflected accurately.This device pressure scope of application can reach 50MPa, actual close to producing, and has more guiding value; Adopt drainage metering absorption and gas desorption quantity, test result is more accurate; Adopt automatic monitoring system, can real-time dynamic monitoring be realized, reflect the pressure-dependent essence of adsorption and desorption process.
Although give some embodiments of the present invention, it will be understood by those of skill in the art that without departing from the spirit of the invention herein, can change embodiment herein.Above-described embodiment is exemplary, should using embodiment herein as the restriction of interest field of the present invention.

Claims (3)

1. measure a device for the absorption of danks surface gas and danks desorption curve, comprise super constant temperature oven, air-channel system and monitoring system, it is characterized in that:
Described air-channel system comprises high pressure gas cylinder to be measured, vacuum pump, helium tank and adsorption tanks, described high pressure gas cylinder to be measured, vacuum pump and helium tank are connected to described adsorption tanks by Trunk Line, the outlet side of described high pressure gas cylinder to be measured connects described vacuum pump by high pressure bottle valve to be measured, and described vacuum pump is connected to the inlet end of described adsorption tanks by the first valve; The outlet side of described helium tank is connected on described Trunk Line by helium tank outlet valve;
Described monitoring system comprises inlet end high-precision gas mass flowmeter, the system pressure sensor of being located at described adsorption tanks inlet end and is located at temperature sensor and the endpiece high-precision gas mass flowmeter of described adsorption tanks outlet side, and described monitoring system is external to computing machine;
Described adsorption tanks and temperature sensor are located in described super constant temperature oven.
2. a kind of device measuring the absorption of danks surface gas and danks desorption curve as claimed in claim 1, it is characterized in that, described monitoring system also comprises: be located at the vacuum pump pressure sensor on vacuum pump.
3. a kind of device measuring the absorption of danks surface gas and danks desorption curve as claimed in claim 1, it is characterized in that, described vacuum pump is also provided with vacuum pump high-grade pressure gauge, and described Trunk Line is provided with inlet end high-grade pressure gauge.
CN201510319609.XA 2015-06-12 2015-06-12 Device for measuring danks surface gas adsorption and danks desorption curves CN104897514A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105259069A (en) * 2015-10-29 2016-01-20 贵州大学 Simple experiment device and method for shale gas adsorption and desorption
CN105588929A (en) * 2016-03-20 2016-05-18 贵州大学 Water bath constant-temperature methane diffusion determination system
CN106442938A (en) * 2016-10-17 2017-02-22 铜仁中能天然气有限公司 Device used in surveying calculation method for accurately acquiring shale gas content
CN107478559A (en) * 2017-07-26 2017-12-15 太原理工大学 A kind of device and method simulated gas and migrated in different-grain diameter size coal sample
CN109142669A (en) * 2018-09-27 2019-01-04 西安科技大学 One kind being based on the relevant coal-bed gas parameter rapid assay methods of data

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CN105588929A (en) * 2016-03-20 2016-05-18 贵州大学 Water bath constant-temperature methane diffusion determination system
CN106442938A (en) * 2016-10-17 2017-02-22 铜仁中能天然气有限公司 Device used in surveying calculation method for accurately acquiring shale gas content
CN107478559A (en) * 2017-07-26 2017-12-15 太原理工大学 A kind of device and method simulated gas and migrated in different-grain diameter size coal sample
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CN109142669A (en) * 2018-09-27 2019-01-04 西安科技大学 One kind being based on the relevant coal-bed gas parameter rapid assay methods of data

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Application publication date: 20150909