CN217084830U - Method for measuring gas tracer in water and CO 2 Experimental device for well distribution coefficient - Google Patents
Method for measuring gas tracer in water and CO 2 Experimental device for well distribution coefficient Download PDFInfo
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- CN217084830U CN217084830U CN202220860219.9U CN202220860219U CN217084830U CN 217084830 U CN217084830 U CN 217084830U CN 202220860219 U CN202220860219 U CN 202220860219U CN 217084830 U CN217084830 U CN 217084830U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 125
- 239000000700 radioactive tracer Substances 0.000 title claims abstract description 94
- 238000000034 method Methods 0.000 title claims description 15
- 238000009826 distribution Methods 0.000 title abstract description 30
- 238000002347 injection Methods 0.000 claims abstract description 24
- 239000007924 injection Substances 0.000 claims abstract description 24
- 238000005070 sampling Methods 0.000 claims abstract description 21
- 238000004817 gas chromatography Methods 0.000 claims abstract description 14
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 18
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 9
- 239000001569 carbon dioxide Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 7
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- 239000007789 gas Substances 0.000 description 216
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- 238000012216 screening Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
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- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 3
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Abstract
The utility model provides a measure gaseous tracer at water and CO 2 An experimental device for distributing coefficients. Can determine the quantity of the tracer and CO when the distribution coefficient of the tracer is required to be determined 2 The mixed gas is conveyed to a phase equilibrium container, and the mixed gasMixing the mixture with water of known volume in a phase equilibrium container, introducing the dehydrated mixed gas into a sampling container when the pressure value measured by a pressure sensor is constant, and finally determining the mixed gas in the sampling container by a gas chromatography mass spectrometer to obtain the gas tracer in CO 2 Concentration in phase
After passing through the purification pipeline, the volume of the water phase is changed, and the experiment is repeated to obtain different water phase volumes V water And CO 2 Volume of phase
Corresponding to
Calculating to obtain the tracer in water and CO by drawing a scatter diagram and adopting linear fitting through intercept and water injection quantity m 2 The distribution coefficient K is well distributed, so, the experimental apparatus of the application can realize the measurement of the distribution coefficient of the gas tracer in the gas-water two-phase.
Description
Technical Field
The utility model relates to a tracer detection technology specifically is a measure gaseous tracer at water and CO 2 An experimental device for distributing coefficients.
Background
In CO 2 In geological utilization and sequestration monitoring, the CO on the earth surface needs to be monitored 2 Determination of CO by Change in concentration 2 But is influenced by plant photosynthesis and respiration, atmospheric CO 2 Too large concentration fluctuation range will interfere with the accuracy of the monitoring result. Monitoring with a gas tracer can effectively reduce these effects. The gas tracer acts by mixing the tracer with the injection gas (CO) 2 ) The mixed gas is injected into the stratum in a certain proportion, and the diffusion track of the injected gas can be obtained by monitoring the concentration of the tracer gas. Thus, in CO 2 Gas tracer can be adopted to track and monitor CO in geological utilization and sequestration 2 The migration track in the porous medium or the reservoir is important to ensure that the tracer gas can fully exert the tracing effect.
When screening gas tracer, the gas tracer is in CO besides cost and stability 2 And formation water partition coefficient is an important screening criterion, so that a method capable of measuring the distribution coefficient of a gas tracer in water and CO is urgently needed 2 An experimental device for distributing coefficients.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the present invention provides a method for measuring gas tracer in water and CO 2 An experimental device for the distribution of coefficients by measuring the concentration of tracer in water and CO 2 The distribution coefficient is distributed to obtain the purpose of a proper tracer.
In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:
method for measuring gas tracer in water and CO 2 An experimental apparatus for distributing coefficients, comprising: the device comprises a tracer gas high-pressure gas cylinder to be detected, a first valve, a metering pump, a second valve, a carbon dioxide high-pressure gas cylinder, a third valve, a water inlet pipe, a first flowmeter, a gas mixing container, a fourth valve, a phase balance container, a water-gas separator, a fifth valve, a first pump, a sampling container, a gas chromatography-mass spectrometer, a pressure sensor, an air inlet pipe and a data acquisition device;
the water inlet pipe is communicated with the phase equilibrium container and is used for injecting water into the phase equilibrium container;
the gas outlet of the tracer gas high-pressure gas cylinder to be detected is communicated with the gas inlet of a metering pump through a first valve, and the metering pump is used for controlling the injection amount of other tracer agents to be detected;
the gas outlet of the metering pump is connected with the gas inlet of the gas mixing container through a second valve;
the gas outlet of the carbon dioxide high-pressure gas cylinder is connected with the gas inlet of the gas mixing container through a third valve;
the first flow meter is used for metering CO injected into the gas mixing container 2 The volume of (a);
the gas outlet of the gas mixing container is communicated with the first end of the gas inlet pipe through a fourth valve;
the first end of the air inlet pipe is communicated with the phase balance container, and the air inlet pipe is used for conveying the mixed gas to the phase balance container to be mixed with the water in the phase balance container;
the pressure sensor is used for detecting the pressure in the phase equilibrium container;
the top of the phase balance container is provided with an air outlet, the air outlet of the phase balance container is communicated with an air inlet of the water-gas separator through a fifth valve, and the air outlet of the water-gas separator is communicated with an air inlet of the sampling container through a first pump;
the gas chromatography mass spectrometer is communicated with the sampling container and is used for measuring the mixed gas in the sampling container;
the data acquisition device is in communication connection with the metering pump, the pressure sensor and the gas chromatography mass spectrometer and is used for acquiring data of the metering pump, the pressure sensor and the gas chromatography mass spectrometer.
Preferably, the phase equalization vessel is of cylindrical configuration.
Preferably, the phase equilibrium container is made of organic glass material.
Preferably, the second end of the gas inlet pipe is positioned at the bottom of the phase equilibrium container and is used for introducing the mixed gas of the gas mixing container into the water of the phase equilibrium container.
Preferably, the method further comprises the following steps: a three-way valve;
and a first port of the three-way valve is communicated with an air outlet of the phase balance container, a second port of the three-way valve is communicated with the water inlet pipe, and a third port of the three-way valve is communicated with an air inlet of the water-gas separator through a fifth valve.
Preferably, the method further comprises the following steps: a gas circulation loop for circulating the gas introduced into the water of the phase equalization vessel.
Preferably, the gas circulation circuit comprises: a second pump, a first conduit and a second conduit;
the bottom of the phase balance container is provided with an air inlet;
one end of the first pipeline is communicated with the third port of the three-way valve, the other end of the first pipeline is communicated with one end of the second pipeline through the second pump, and the other end of the second pipeline is communicated with the air inlet of the phase balance container.
Preferably, the gas circulation circuit further comprises: and the one-way valve is arranged on the second pipeline.
Preferably, the method further comprises the following steps: and a second flowmeter disposed in the gas circulation circuit.
Preferably, the method further comprises the following steps: and the temperature control element is arranged on the phase equilibrium container.
The utility model discloses a measure gaseous tracer at water and CO 2 The experimental device for the middle distribution coefficient can be used for cleaning the phase balance container when the tracer distribution coefficient needs to be measured, then carrying out pressure test on the measuring system, closing the first valve, the second valve, the third valve, the fourth valve and the fifth valve, then injecting a certain amount of water into the phase balance container through the water inlet pipe, and recording the volume V of the water water The pressure in the phase equilibrium container is monitored in real time through a pressure sensor, the water inlet pipe is closed after water injection is completed, then the first valve and the second valve are opened, the gas tracer to be detected is injected into the gas mixing container, the injection amount of the gas tracer to be detected is controlled through a metering pump, the injection amount m of the gas tracer to be detected is recorded, and after the gas tracer to be detected is injected into the gas mixing container, the CO of the carbon dioxide high-pressure gas cylinder is enabled to be in a CO state through opening the third valve 2 Injecting into a gas mixing vessel and recording CO by a first flow meter 2 Volume of injection
And in CO 2 After the injection is completed, the second valve and the third valve are closed, the fourth valve is opened, the mixed gas in the gas mixing container enters the phase balance container through the gas inlet pipe, after the mixed gas enters the phase balance container, the mixed gas is waited to be mixed with water, when the pressure value measured by the pressure sensor is constant, after standing for preset time, the fifth valve is opened, under the action of the first pump, the mixed gas in the phase balance flows to the water-gas separator for dehydration, the dehydrated mixed gas enters the sampling container, and finally the mixed gas in the sampling container is measured through the gas chromatography-mass spectrometer, so that the gas tracer in CO can be obtained 2 Concentration in phase
After the pipeline is cleaned by draining and exhausting water, the volume V of the water phase is changed water Repeating the above experiment for multiple times to obtain different water phase volumes V water And CO 2 Volume of phase
Corresponding to C water To do so by
Is shown as the abscissa of the graph,
drawing a scatter diagram for the ordinate, obtaining a slope and an intercept through linear fitting, and finally obtaining the tracer in water and CO through calculating the intercept and m 2 Partition coefficient K, therefore, the measurement gas tracer provided herein is in water and CO 2 The experimental device for the middle distribution coefficient can realize the measurement of the distribution coefficient of the gas tracer in a gas-water two-phase system, namely, the measurement of a water phase and CO 2 Phase volume and trace gas in CO 2 The distribution coefficient of the gas tracer can be obtained according to the concentration of the phase, so that the concentration of the gas tracer with poor water solubility in the water phase is avoided being directly calculated, and the measurement error is greatly reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 shows a measurement gas tracer in water and CO provided by an embodiment of the present invention 2 The structure of the experimental device for the distribution coefficient is shown schematically.
Wherein, the tracer gas high-pressure gas cylinder 1 to be tested; a first valve 2; a metering pump 3; a second valve 4; a carbon dioxide high-pressure gas cylinder 5; a third valve 6; a first flow meter 7; a gas mixing vessel 8; a fourth valve 9; a phase equilibrium vessel 10; a water inlet pipe 11; a three-way valve 12; a check valve 13; a second flow meter 14; a second pump 15; a fifth valve 16; a moisture separator 17; a first pump 18; a sampling vessel 19; a gas chromatography mass spectrometer 20; a pressure sensor 21; a data acquisition device 22; a first duct 23; a second conduit 24; an intake pipe 25.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
An embodiment of the utility model provides a measure gaseous tracer at water and CO 2 Experimental device for the distribution coefficient, see FIG. 1, FIG. 1 is a diagram for measuring the distribution coefficient of a gas tracer in water and CO 2 Schematic structural diagram of experimental device for distribution coefficient, measuring gas tracer in water and CO 2 The experimental device for distributing coefficients comprises: the tracer gas high-pressure gas cylinder 1 to be detected, the first valve 2, the metering pump 3, the second valve 4 and the dioxideThe system comprises a carbon high-pressure gas cylinder 5, a third valve 6, a water inlet pipe 11, a first flow meter 7, a gas mixing container 8, a fourth valve 9, a phase equilibrium container 10, a water-gas separator 17, a fifth valve 16, a first pump 18, a sampling container 19, a gas chromatography-mass spectrometer 20, a pressure sensor 21, a gas inlet pipe 25 and a data acquisition device 22;
the water inlet pipe 11 is communicated with the phase equilibrium container 10, and the water inlet pipe 11 is used for injecting water into the phase equilibrium container 10;
the gas outlet of the tracer gas high-pressure gas cylinder 1 to be detected is communicated with the gas inlet of the metering pump 3 through the first valve 2, and the metering pump 3 is used for controlling the injection amount of other tracer agents to be detected;
the gas outlet of the metering pump 3 is connected with the gas inlet of the gas mixing container 8 through the second valve 4;
the gas outlet of the carbon dioxide high-pressure gas cylinder 5 is connected with the gas inlet of the gas mixing container 8 through a third valve 6;
the first flow meter 7 is used for metering CO injected into the gas mixing container 8 2 The volume of (a);
the gas outlet of the gas mixing container 8 is communicated with the first end of the gas inlet pipe 25 through a fourth valve 9;
a first end of the gas inlet pipe 25 is communicated with the phase equilibrium container 10, and the gas inlet pipe 25 is used for conveying mixed gas to the phase equilibrium container 10 to be mixed with water in the phase equilibrium container 10;
the pressure sensor 21 is used for detecting the pressure in the phase equilibrium container 10;
the top of the phase balance container 10 is provided with an air outlet, the air outlet of the phase balance container 10 is communicated with an air inlet of a water-gas separator 17 through a fifth valve 16, and the air outlet of the water-gas separator 17 is communicated with an air inlet of a sampling container 19 through a first pump 18;
the gas chromatography mass spectrometer 20 is communicated with the sampling container 19, and the gas chromatography mass spectrometer 20 is used for measuring the mixed gas in the sampling container 19;
the gas circulation loop is used for introducing the gas of the phase equilibrium container 10 into the water of the phase equilibrium container 10;
the data acquisition device 22 is in communication connection with the metering pump 3, the pressure sensor 21 and the gas chromatography mass spectrometer 20, and is used for acquiring data of the metering pump 3, the pressure sensor 21 and the gas chromatography mass spectrometer 20.
It should be noted that, according to the technical scheme disclosed above, when the distribution coefficient of the tracer needs to be measured, the phase equilibrium container 10 is cleaned first, then the pressure test of the measurement system is performed, then the first valve 2, the second valve 4, the third valve 6, the fourth valve 9 and the fifth valve 16 are closed, then a certain amount of water is injected into the phase equilibrium container 10 through the water inlet pipe 11, and the volume V of the water is recorded water The pressure in the phase equilibrium container 10 is monitored in real time through the pressure sensor 21, the water inlet pipe 11 is closed after water injection is finished, then the first valve 2 and the second valve 4 are opened, the tracer gas to be detected is injected into the gas mixing container 8, the injection amount of the tracer gas to be detected is controlled through the metering pump 3, the injection amount m of the tracer gas to be detected is recorded, and after the tracer gas to be detected is injected into the gas mixing container 8, the CO of the carbon dioxide high-pressure gas cylinder 5 is enabled to be in a CO state by opening the third valve 6 through opening the third valve 6 2 Is injected into a gas mixing vessel 8 and the CO is recorded by a first flow meter 7 2 Volume of injection
And in CO 2 After the injection is finished, the second valve 4 and the third valve 6 are closed, the fourth valve 9 is opened, the mixed gas in the gas mixing container 8 enters the phase balance container 10 through the gas inlet pipe 25, after the mixed gas enters the phase balance container 10, the mixed gas is mixed with water, when the pressure value measured by the pressure sensor 21 is constant, the fifth valve 16 is opened after standing for preset time, the mixed gas in the phase balance flows to the water-gas separator 17 to be dehydrated under the action of the first pump 18, the dehydrated mixed gas enters the sampling container 19, and finally the mixed gas in the sampling container 19 is measured through the gas chromatography mass spectrometer 20, so that the gas tracer in the CO tracer can be obtained 2 Concentration in phase
After the pipeline is cleaned by draining and exhausting water, the volume V of the water phase is changed water Repeating the above experiment for multiple times to obtain different resultsVolume of aqueous phase V water And CO 2 Volume of phase
Corresponding to
According to the formula (1) in
Is shown as the abscissa of the graph,
drawing a scatter diagram for the ordinate, and obtaining the slope by linear fitting
And intercept
By intercept
And m is calculated to obtain the tracer in water and CO 2 And a middle distribution coefficient K.
Formula (1):
according to the technical scheme, the distribution coefficient of the gas tracer in the gas-water two-phase system can be measured, and the water phase and CO are measured 2 Phase volume and trace gas in CO 2 The distribution coefficient of the gas tracer can be obtained according to the concentration of the phase, so that the concentration of the gas tracer with poor water solubility in the water phase is avoided being directly calculated, and the measurement error is greatly reduced.
In particular, the phase equalization vessel 10 is of cylindrical configuration.
It should be noted that the phase equilibrium vessel 10 has a cylindrical structure, and may have other shapes, and those skilled in the art can select the shape as needed.
Specifically, the phase equilibrium vessel 10 is made of organic glass material.
It should be noted that, the organic glass material is used to manufacture the phase equilibrium container 10, which is convenient for the experimenter to observe the internal state of the phase equilibrium container 10 in real time.
It should be noted that the present invention can also be used to manufacture the phase equilibrium container 10 from other materials with light transmission, and therefore, the phase equilibrium container 10 is not limited to organic glass materials.
Specifically, the second end of the gas inlet pipe 25 is located at the bottom of the phase equilibrium vessel 10, and is used for introducing the mixed gas in the gas mixing vessel 8 into the water in the phase equilibrium vessel 10.
The second end of the gas inlet pipe 25 is disposed at the bottom of the phase equilibrium vessel 10, and is used for introducing the mixed gas in the gas mixing vessel 8 into the water in the phase equilibrium vessel 10, so that the mixed gas can be sufficiently mixed with the water when entering the phase equilibrium vessel 10.
Further, measuring the presence of gas tracer in water and CO 2 The experimental device for distributing coefficients further comprises: a three-way valve 12;
a first port of the three-way valve 12 is communicated with an air outlet of the phase equilibrium container 10, a second port of the three-way valve 12 is communicated with the water inlet pipe 11, and a third port of the three-way valve 12 is communicated with an air inlet of the water-gas separator 17 through a fifth valve 16.
It should be noted that, by arranging the three-way valve 12, and communicating the first port of the three-way valve 12 with the gas outlet of the phase equilibrium container 10, the second port of the three-way valve 12 is communicated with the water inlet pipe 11, and the third port of the three-way valve 12 is communicated with the gas inlet of the moisture separator 17 through the fifth valve 16, when water needs to be injected into the phase equilibrium container 10, the second port of the three-way valve 12 can be opened, the third port is closed, and when the mixed gas in the phase equilibrium container 10 is conveyed into the water in the phase equilibrium container 10 by the circulation loop, only the third port needs to be opened, the second port is closed, the number of openings in the phase equilibrium container 10 is effectively reduced, the gas tightness of the phase equilibrium container 10 is ensured, and the accuracy of measurement is further ensured.
Further, measuring the presence of gas tracer in water and CO 2 The experimental device for distributing coefficients further comprises: a gas circulation loop for circulating the gas of the phase equalization vessel 10 into the water of the phase equalization vessel 10.
It should be noted that, through setting up the gas circulation circuit that is used for circulating the gaseous leading-in aquatic of phase balance container 10, gas circulation circuit can carry the gas mixture to the aquatic in the phase balance, increases the area of contact that gas mixture and water mix, consequently, can effectively promote the speed of gas mixture and water, and then can effectively accelerate the experiment process.
Specifically, the gas circulation loop comprises: a second pump 15, a first pipe 23 and a second pipe 24;
the bottom of the phase balance container 10 is provided with an air inlet;
one end of the first pipe 23 is communicated with the third port of the three-way valve 12, the other end is communicated with one end of the second pipe 24 through the second pump 15, and the other end of the second pipe 24 is communicated with the air inlet of the phase equilibrium container 10.
It should be noted that, by providing the second pump 15, the first pipeline 23 and the second pipeline 24, and opening an air inlet at the bottom of the phase equilibrium container 10; and communicate one end of the first pipeline 23 with the third mouth of the three-way valve 12, the other end of the first pipeline 23 communicates with one end of the second pipeline 24 through the second pump 15, the other end of the second pipeline 24 communicates with the air inlet of the phase equilibrium container 10, so that the second pump 15 can convey the mixed gas in the phase equilibrium container 10 to the water in the phase equilibrium container 10, the mixed gas and the water are fully mixed, and the mixing rate of the mixed gas and the water is improved.
Preferably, the second pump 15 is disposed at a height higher than the level of the water in the phase equilibrium vessel 10.
Further, the gas circulation circuit further comprises: a check valve 13 disposed in the second conduit 24.
Note that the tracer gas and CO are mixed in the gas mixing vessel 8 2 After the mixing is finished, the phase equilibrium container 10 is in a closed environment, the fourth valve 9 is opened, and the mixed gas is conveyed to the phase equilibrium container 10The pressure in the phase equilibrium container 10 is increased, which may cause water in phase equilibrium to enter the second pump 15 from the second pipeline 24, and the water entering the second pump 15 may cause a short circuit and other problems in the second pump 15, so that the water entering the second pump 15 from the second pipeline 24 can be effectively prevented by providing the check valve 13 in the second pipeline 24, and the water can be prevented from damaging the second pump 15.
Further, measuring the presence of gas tracer in water and CO 2 The experimental device for the distribution coefficient also comprises: a second flow meter 14 disposed in the gas circulation loop.
It should be noted that, by providing the second flow meter 14 in the gas circulation loop, it is convenient for the operator to determine whether the gas circulation loop is in the working state, i.e. whether the mixed gas in the phase equilibrium container 10 is delivered to the water in the phase equilibrium container 10.
Further, measuring the presence of gas tracer in water and CO 2 The experimental device for distributing coefficients further comprises: a temperature control element disposed in the phase equilibrium vessel 10.
It should be noted that, by arranging the temperature control element in the phase equilibrium container 10, it can be ensured that the temperature in the phase equilibrium container 10 is within a certain range, thereby effectively avoiding the influence of too high or too low temperature in the phase equilibrium container 10 on the solubility of the tracer in water, and ensuring that the tracer obtained by final calculation is in water and CO 2 Accuracy of the distribution coefficients.
To facilitate understanding of the above solution, the solution is further described below with reference to fig. 1.
In CO 2 And in the sealing and storing of the salt water layer, the information obtained by tracing and monitoring and the types of the injected gas tracer. To obtain the desired monitoring effect, the screening criteria and the screening process must first be perfected in order to achieve the goal of optimizing the gas tracer. The screening criteria include cost, stability, partition coefficient, etc., wherein the partition coefficient is an important factor affecting the monitoring effect.
The gas tracer has a certain distribution ratio between the water phase and the gas phase, and the concentration ratio of the gas tracer in the two phases is the distribution coefficient and is expressed by K. For the same component, the temperature and the pressure are constant, and the component is in gasThe concentration difference of the partition in the two liquid phases is obvious but the ratio is fixed. This means the degree of distribution of the gas tracer in the reservoir between the aqueous and gas phases. The different distribution amount of the gas tracer in the gas-water two phases determines the different flow rates of the gas tracer, so that a distribution coefficient is introduced as a standard for measuring the distribution degree of the gas tracer. The value of the partition coefficient depends on a number of factors including: the type of tracer, the composition of the formation water, the formation pressure, temperature, etc. Distribution coefficient
In the formula K C/W Is the partition coefficient of the gas tracer,
for gas tracers in the gas phase (CO) 2 ) Concentration of (B), C water Is the concentration of the gas tracer in the aqueous phase (formation water).
The mass of the tracer gas is m, and the tracer gas is divided into two parts,
and m water Respectively trace gas in CO 2 The mass of the phase and the mass of the tracer gas in the aqueous phase (note that CO is not meant here 2 Mass of water and mass of water).
m water ＝V water ·C water
In the above formula, the first and second carbon atoms are,
is CO 2 The volume occupied in the phase equilibrium vessel 11,
for trace gases in CO 2 Concentration in phase, V water The volume of water in the phase equilibrium vessel 10, C water Is the concentration of the tracer gas in the aqueous phase. K is tracer gas in CO 2 And the partition coefficient in water.
The injection quantity m of the gas tracer is fixed, and only CO needs to be calculated 2 Volume of
Volume V of water water And measuring the presence of a gas tracer in CO by means of a gas chromatograph 2 The concentration of the phases. Parameters corresponding to different water injection amounts are obtained by changing the water injection amount so as to
Is shown as the abscissa of the graph,
drawing a scatter diagram for the ordinate, obtaining a slope of
Intercept of
K can be calculated from the intercept and m.
The utility model discloses a measure tracer in water and CO 2 Experiment of the partition coefficientThe device comprises: a tracer gas high-pressure gas cylinder to be detected; a first valve; gas injection high-pressure metering pump; a second valve; a carbon dioxide high pressure gas cylinder; a third valve; a first flow meter; a gas mixing vessel; a fourth valve; a phase equilibrium vessel; a water injection pipe; a three-way valve; a one-way valve; a second flow meter; a first pump; a fifth valve; a water-gas separator; a second pump; a sampling container; a gas chromatography mass spectrometer; a pressure sensor; a data acquisition device.
The phase equilibrium container is a main body for carrying out water-gas two-phase equilibrium, is cylindrical in shape, and adopts an organic glass material so as to observe the internal state. The bottom of the phase equilibrium container is provided with a temperature control element which can adjust the temperature of the fluid in the container.
A gas circulation loop is formed by the three-way valve, the second pump, the second flowmeter and the check valve, so that gas and liquid are fully mixed, and the experimental process is accelerated.
The following is a commonly used gas tracer SF 6 The procedure of the experimental apparatus of the present application is specifically described for the examples.
1. Cleaning a phase balance container, connecting an experimental device, and carrying out pressure test inspection on a measurement system;
2. closing all valves;
3. injecting a certain amount of water into the phase equilibrium container through the water inlet pipe, and recording the volume V of the injected water water Monitoring the pressure and temperature in the phase equilibrium container, and closing the water inlet pipe; the temperature in the phase equilibrium vessel is controlled by a temperature control element.
4. Opening the first and second valves and introducing the gas tracer to be tested (in SF) 6 For example), the gas tracer is injected into a gas mixing container, the injection amount of the gas tracer to be measured is controlled by a metering pump, and the injection amount m of the gas is recorded.
5. Opening the third valve to introduce CO 2 The gas is injected into the gas mixing vessel. The first flowmeter is connected with the data acquisition device and records CO in the experimental process 2 Injection volume
6. And closing the second valve and the third valve, opening the fourth valve, and allowing the mixed gas to enter the phase equilibrium container through an air inlet pipeline, wherein the air outlet end of the pipeline is below the liquid level, so that the contact between the gas and the liquid is increased. The fourth valve is closed.
7. And opening the gas circulation loop, keeping other valves closed, and fully circulating the mixed gas in the loop until the pressure indication of the pressure sensor is kept constant.
8. The circulation loop is closed and left for a period of time.
9. Measurement of gas tracer in CO 2 Concentration in phase
The fifth valve is opened and a sample is taken from the phase equilibration vessel by the first pump and dehydrated via a moisture separator, the gas entering the sampling vessel.
10. The components of the sampled gas sample are measured by a gas chromatography mass spectrometer, and the gas tracer in CO is obtained by measurement 2 Concentration in phase
11. Draining water and exhausting gas, and purifying the pipeline. Changing the volume V of the aqueous phase water And repeatedly testing different water phase volumes V water And CO 2 Volume of phase
Corresponding to
To be provided with
Is shown as the abscissa of the graph,
drawing a scatter diagram for the ordinate, obtaining a slope of
Intercept of
K can be calculated from the intercept and m.
12. After the experiment is finished, all valves are ensured to be kept in a closed state, and power supplies of all equipment are turned off.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. Method for measuring gas tracer in water and CO 2 An experimental apparatus for distributing coefficients, comprising: the device comprises a tracer gas high-pressure gas cylinder to be detected, a first valve, a metering pump, a second valve, a carbon dioxide high-pressure gas cylinder, a third valve, a water inlet pipe, a first flowmeter, a gas mixing container, a fourth valve, a phase balance container, a water-gas separator, a fifth valve, a first pump, a sampling container, a gas chromatography-mass spectrometer, a pressure sensor, an air inlet pipe and a data acquisition device;
the water inlet pipe is communicated with the phase equilibrium container and is used for injecting water into the phase equilibrium container;
the gas outlet of the tracer gas high-pressure gas cylinder to be detected is communicated with the gas inlet of the metering pump through the first valve, and the metering pump is used for controlling the injection amount of other tracer agents to be detected;
the gas outlet of the metering pump is connected with the gas inlet of the gas mixing container through the second valve;
the gas outlet of the carbon dioxide high-pressure gas cylinder is connected with the gas inlet of the gas mixing container through the third valve;
the first flow meter being adapted to meter the injection into the gas mixing containerCO 2 The volume of (a);
the gas outlet of the gas mixing container is communicated with the first end of the gas inlet pipe through the fourth valve;
the first end of the air inlet pipe is communicated with the phase equilibrium container, and the air inlet pipe is used for conveying mixed gas to the phase equilibrium container to be mixed with water in the phase equilibrium container;
the pressure sensor is used for detecting the pressure in the phase equilibrium container;
the top of the phase balance container is provided with an air outlet, the air outlet of the phase balance container is communicated with the air inlet of the water-gas separator through the fifth valve, and the air outlet of the water-gas separator is communicated with the air inlet of the sampling container through the first pump;
the gas chromatographic mass spectrometer is communicated with the sampling container and is used for measuring the mixed gas in the sampling container;
the data acquisition device is in communication connection with the metering pump, the pressure sensor and the gas chromatography mass spectrometer and is used for acquiring data of the metering pump, the pressure sensor and the gas chromatography mass spectrometer.
2. The experimental device as claimed in claim 1, wherein the phase equilibrium vessel is of a cylindrical structure.
3. The experimental device as claimed in claim 1, wherein the phase-equilibrium container is made of organic glass material.
4. The experimental apparatus as claimed in claim 1, wherein the second end of the gas inlet pipe is located at the bottom of the phase equilibrium container for introducing the mixed gas of the gas mixing container into the water of the phase equilibrium container.
5. The experimental apparatus of claim 1, further comprising: a three-way valve;
and a first port of the three-way valve is communicated with an air outlet of the phase equilibrium container, a second port of the three-way valve is communicated with the water inlet pipe, and a third port of the three-way valve is communicated with an air inlet of the water-gas separator through the fifth valve.
6. The experimental apparatus of claim 5, further comprising: a gas circulation loop for circulating gas that is introduced into the phase equilibration vessel in water.
7. The experimental apparatus of claim 6, wherein the gas circulation loop comprises: a second pump, a first conduit and a second conduit;
the bottom of the phase balance container is provided with an air inlet;
one end of the first pipeline is communicated with the third port of the three-way valve, the other end of the first pipeline is communicated with one end of the second pipeline through the second pump, and the other end of the second pipeline is communicated with the air inlet of the phase equilibrium container.
8. The experimental apparatus of claim 7, wherein the gas circulation loop further comprises: and the one-way valve is arranged on the second pipeline.
9. The experimental apparatus of claim 6, further comprising: a second flow meter disposed in the gas circulation loop.
10. The experimental apparatus of claim 1, further comprising: and the temperature control element is arranged on the phase equilibrium container.
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