CN103983552A - In-situ adsorption testing device for rock core gas and working method of in-situ adsorption testing device - Google Patents
In-situ adsorption testing device for rock core gas and working method of in-situ adsorption testing device Download PDFInfo
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- CN103983552A CN103983552A CN201410228830.XA CN201410228830A CN103983552A CN 103983552 A CN103983552 A CN 103983552A CN 201410228830 A CN201410228830 A CN 201410228830A CN 103983552 A CN103983552 A CN 103983552A
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Abstract
The embodiment of the invention provides an in-situ adsorption testing device for rock core gas and a working method of the in-situ adsorption testing device. The device comprises a constant-temperature tank for providing a required testing temperature, wherein a sample tank, a first pressure transmitter and a pressure loader are arranged in the constant-temperature tank, a gas adding device and a stress loading device are arranged outside the constant-temperature tank, and the sample tank is used for containing a to-be-tested rock core sample; the gas adding device is used for injecting testing gas into the sample tank until the pressure in the sample tank reaches a preset testing pressure value; the first pressure transmitter is used for acquiring the pressure and temperature data of the sample tank; the stress loading device is used for supplying pressure to the stress loading device; the pressure loader is used for converting the pressure supplied by the stress loading device into confining pressure and axial pressure which are supplied to the rock core sample in the sample tank. According to the embodiment, the confining pressure and the axial pressure are increased when the temperature and the gas pressure are considered, the test conditions are accordant with in-situ adsorption states of coal rock and shale, so that the accuracy of an adsorption test measuring result is increased.
Description
Technical field
The present invention relates to coal-seam gas original position adsorption instrument technical field, particularly a kind of rock core gas original position absorption proving installation and method of work thereof.
Background technology
Coal-seam gas and shale gas are to compose to have a kind of unconventional rock gas that is ADSORPTION STATE, free state and solubilised state in coal seam and shale.Wherein adsorbed gas is most important store status, and mechanism is physisorption.Physisorption is with the gas molecule around the Van der Waals for absorption of particle surface, is a kind of physical adsorption process carrying out at solid surface, meets Langmuir equation at constant temperature.In isothermal adsorption process, pressure has a significant effect to suction-operated, with the increase adsorbance of pressure, increases gradually.Test accurately coal petrography and shale adsorptive power all significant to evaluating reservoir, development plan design and economic evaluation.
In the prior art, isothermal adsorption proving installation has following several function: possess the function of measuring the Adsorption Isotherms in low pressure porous permeable solid; Can measure the adsorption and desorption isotherm of periporate powder solid surface water vapor; Can measure the adsorption and desorption isotherm of irregular solid surface mixed gas.But there is following defect in above-mentioned isothermal adsorption proving installation: test pressure and temperature are less, can not meet the needs of coal-seam gas and shale gas High Temperature High Pressure.
In addition, in the prior art, a kind of " High Temperature High Pressure rock core gas absorption proving installation " is also provided, mainly by thermostatic box, the temperature-controlling system, temp measuring system, pressure testing system, gas storing system, the adsorption system that are placed in thermostatic box, formed, this device has high, medium and low three cover pressure tester and a plurality of air storage chambers, and the core sample chamber of adsorption system also comprises a plurality of known volume calibrated bolcks.This device can be in larger temperature, pressure limit, the absorption/desorption isotherm of the fixed state core sample of accurately measuring different characteristic to all kinds of single, multicomponent gases.A kind of " high-temperature high-pressure adsorption tester " is also provided, this high-temperature high-pressure adsorption tester comprises gas pressurized device, adsorbent equipment, temperature control equipment, jacking gear and data acquisition system (DAS), for coal-seam gas, shale gas isothermal adsorbance, desorption quantity test under different pressures condition.Although above-mentioned two kinds of devices can meet isothermal adsorption amount, the desorption quantity test of coal-seam gas and shale gas High Temperature High Pressure, but the test condition that above-mentioned two kinds of devices provide all can not represent coal-seam gas and the shale gas true adsorbed state in reservoir, therefore, make measurement result inaccurate.
Summary of the invention
The embodiment of the present invention provides a kind of rock core gas original position absorption proving installation and method of work thereof, has solved the inaccurate technical matters of measurement result in prior art.
The embodiment of the present invention provides a kind of rock core gas original position absorption proving installation, this device comprises: thermostatic box, for providing test required temperature, in described thermostatic box, be provided with sample pot, the first pressure unit and pressure-loaded device, described thermostatic box is provided with gas outward increases device and stress loading device, wherein, described sample pot, for placing core sample to be tested; The gas vent that described gas increases device is connected with described sample pot, and described gas increases device for inject test gas in described sample pot, and reaches default test pressure value; Described the first pressure unit is connected to described gas to be increased on the gas vent and the pipeline between described sample pot of device, and described the first pressure unit is for gathering the pressure and temperature data of described sample pot; The gas vent of described stress loading device is connected with described pressure-loaded device, and described stress loading device is for providing pressure to described pressure-loaded device; Described pressure-loaded device is converted to for the pressure that described stress loading device is provided confined pressure and the axial compression providing to the core sample of described sample pot, the cavity that described pressure-loaded device is column, and described sample pot is sleeved in described pressure-loaded device.
In one embodiment, described stress loading device comprises: silicone oil bottle; Supercharge pump, the entrance of described supercharge pump is connected with described silicone oil bottle; The first valve, one end of described the first valve is connected with described supercharging delivery side of pump, and the other end is the gas vent of described stress loading device, is connected with described pressure-loaded device.
In one embodiment, in described thermostatic box, also comprise: three-way switch valve, the second pressure unit, with reference to tank, proving tank and the second valve, wherein, the gas access of described three-way switch valve is connected with the gas vent that described gas increases device, the gas vent of described three-way switch valve is connected with described sample pot, described the first pressure unit is connected on the gas vent and the pipeline between described sample pot of described three-way switch valve, the mouth of often outputing of described three-way switch valve is connected with the described gas access with reference to tank, the described gas vent with reference to tank is connected with one end of the second valve, the other end of described the second valve is connected with the gas access of proving tank, described the second pressure unit is connected to often outputing mouthful of described three-way switch valve and described with reference on the pipeline between the gas access of tank, described the second pressure unit is used for, and gathers the described pressure and temperature data with reference to tank, described with reference to tank and described proving tank for injecting the gas of preset pressure value, for calculate described with reference to the volume of tank, the volume of described proving tank and the described sample pot inner space volume under described default test pressure value provides data.
In one embodiment, in described thermostatic box, also comprise: a plurality of described pressure-loaded devices, a plurality of described sample pots, a plurality of described the first pressure units, a plurality of described the second pressure units, a plurality of described three-way switch valves, a plurality of described with reference to tank, a plurality of described proving tanks and a plurality of described the second valve, wherein, described in each, sample pot is sleeved in a described pressure-loaded device, described in each, pressure-loaded device is connected with the gas vent of described stress loading device, described in each, sample pot is connected with the gas vent of a described three-way switch valve, the gas access of this described three-way switch valve is connected with the gas vent that described gas increases device, the mouth of often outputing of this described three-way switch valve is connected with a described gas access with reference to tank, this the described gas vent with reference to tank is connected with one end of described second valve, the other end of this described second valve is connected with the gas access of a described proving tank, described in each, the first pressure unit is connected on the gas vent and the pipeline between a described sample pot of a described three-way switch valve, the gas that described in each, the second pressure unit is connected to a described three-way switch valve often output mouthful and one described with reference on the pipeline between tank.
In one embodiment, also comprise: lifting table, be connected with the gas access end of described three-way switch valve, described lifting table is for promoting or reducing described three-way switch valve, related described sample pot is lifted out to described thermostatic box or is reduced in described thermostatic box.
In one embodiment, also comprise: the 3rd valve, described the 4th one end of valve and the gas access of described three-way switch valve are connected; Vacuum pump, is connected with the other end of described the 3rd valve, and described vacuum pump is for getting rid of described sample pot, described with reference to the air in tank and described proving tank.
In one embodiment, also comprise: computing machine, is connected the pressure and temperature data that gather for obtaining described the first pressure unit and described the second pressure unit with described the second pressure unit with described the first pressure unit; And be connected with described stress loading device with described gas increase device, for controlling described gas, increase the opening and closing of device and described stress loading device.
In one embodiment, described sample pot cavity that be closed at both ends, column.
In one embodiment, the diameter of described sample pot is that 3.8 centimetres, length are 10 centimetres.
The embodiment of the present invention also provides a kind of method of work of rock core gas original position absorption proving installation, and the method comprises: described core sample is placed in described sample pot; Described sample pot is placed in the described pressure-loaded device in described thermostatic box, and wherein, described pressure-loaded device is converted to for the pressure that described stress loading device is provided confined pressure and the axial compression providing to the core sample of described sample pot; Adopt described gas to increase device and inject described test gas in described sample pot, and reach default test pressure value; The pressure and temperature data of obtaining the described sample pot of described the first pressure unit collection, the pressure and temperature data of described sample pot, provide foundation for calculating described core sample to the isothermal adsorption amount of described test gas.
In one embodiment, in described thermostatic box, also comprise: three-way switch valve, the second pressure unit, with reference to tank, proving tank and the second valve, wherein, the gas access of described three-way switch valve is connected with the gas vent that described gas increases device, the gas vent of described three-way switch valve is connected with described sample pot, described the first pressure unit is connected on the gas vent and the pipeline between described sample pot of described three-way switch valve, the mouth of often outputing of described three-way switch valve is connected with the described gas access with reference to tank, the described gas vent with reference to tank is connected with one end of the second valve, the other end of described the second valve is connected with the gas access of proving tank, described the second pressure unit is connected to often outputing mouthful of described three-way switch valve and described with reference on the pipeline between the gas access of tank, described method of work also comprises: double to described with reference to injecting the helium of preset pressure value in tank and described proving tank, wherein, when injecting helium for the second time, in described proving tank, be placed with the steel ball of known volume, according to described the second pressure unit, gather, the described temperature and pressure data with reference to tank after twice injecting gas, calculate the described volume with reference to tank, the volume of described proving tank, to the described inert gas with reference to injecting original pressure value in tank, described original pressure value is greater than described default test pressure value, while being communicated with reference to tank and described sample pot if described, described is described default test pressure value with reference to tank and the stable force value of described sample pot internal gas pressure,, according to described default test pressure value, described original pressure value and the described volume with reference to tank, calculate the inner space volume of described sample pot under described default test pressure value, adopt described gas increase device to described with reference to injecting described test gas in tank, and reach default test pressure value, described the second pressure unit gathers the described temperature and pressure data with reference to tank, be communicated with describedly with reference to tank and described sample pot, described the first pressure unit gathers the temperature and pressure data of described sample pot, according to the described temperature and pressure data with reference to tank of described the second pressure unit collection, described the first pressure unit, gather the temperature and pressure data of described sample pot, described sample pot inner space volume and the described volume with reference to tank under described default test pressure value, calculate the isothermal adsorption amount of described core sample to described test gas
In the invention process, by place the core sample of test in sample pot, and sample pot is positioned in thermostatic box, for sample pot provides test required temperature, thermostatic box can provide the probe temperature of different range, by gas, increasing device injects test gas in sample pot, and reach default test pressure value, can reach the test pressure requirement of different range, meanwhile, the pressure that pressure-loaded device provides stress loading device is converted to confession confined pressure and the axial compression of proposing to the core sample in sample pot.Because inventor finds in the prior art, test condition is only considered temperature, gaseous tension, this test condition (for example can not represent rock core gas, coal-seam gas and shale gas etc.) true adsorbed state in reservoir, therefore, confined pressure and the axial compression providing to the core sample in sample pot is provided pressure stress loading device being provided by pressure-loaded device, realized test condition when considering temperature, gaseous tension, add confined pressure and axial compression, make test condition more approach the true adsorbed state of rock core gas in reservoir; Simultaneously, the cavity that the pressure-loaded device adopting is column, can be by the cavity in pressure-loaded device equably for core sample provides confined pressure and axial compression simultaneously, avoided directly sample tank skin to exert pressure to provide confined pressure and axial compression and the inhomogeneous problem of pressure that causes, thereby the accuracy that has improved the measurement result of rock core gas original position absorption test, can provide more reliable isothermal adsorption curve and data for resource evaluation, individual well mining, numerical simulation etc.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, does not form limitation of the invention.In the accompanying drawings:
Fig. 1 is the structured flowchart of a kind of rock core gas original position absorption proving installation that provides of the embodiment of the present invention;
Fig. 2 is the instantiation figure of a kind of rock core gas original position absorption proving installation that provides of the embodiment of the present invention;
Fig. 3 is the structural representation of a kind of three-way switch valve of providing of the embodiment of the present invention;
Fig. 4 is that a kind of rock core gas original position that the embodiment of the present invention provides is adsorbed the process flow diagram of the method for work of proving installation.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with embodiment and accompanying drawing, the present invention is described in further details.At this, exemplary embodiment of the present invention and explanation thereof are used for explaining the present invention, but not as a limitation of the invention.
In embodiments of the present invention, provide a kind of rock core gas original position absorption proving installation, as shown in Figure 1, this device comprises:
Thermostatic box 27, for providing test required temperature, is provided with sample pot 21, the first pressure unit 23 and pressure-loaded device 22 in described thermostatic box 27, the outer gas that is provided with of described thermostatic box 27 increases device 101 and stress loading device 102, wherein,
Described sample pot 21, for placing core sample to be tested;
The gas vent that described gas increases device 101 is connected with described sample pot 21, and described gas increase device 101 is for to the interior injection test gas of described sample pot 21, and reaches and preset test pressure value;
Described the first pressure unit 23 is connected to described gas to be increased on the gas vent and the pipeline between described sample pot 21 of device 101, described the first pressure unit 23 for the pressure and temperature data that gather described sample pot 21 (for example, at described gas, increase device 101 and inject after described test gas to described sample pot 21, gather the pressure and temperature data of described sample pot 21);
The gas vent of described stress loading device 102 is connected with described pressure-loaded device 22, and described stress loading device 102 is for providing pressure to described pressure-loaded device 22;
Confined pressure and the axial compression providing to the core sample of described sample pot 21 is provided for the pressure that described stress loading device 102 is provided described pressure-loaded device 22, the cavity that described pressure-loaded device 22 is column, described sample pot 21 is sleeved in described pressure-loaded device 22.
Known as shown in Figure 1, in embodiments of the present invention, by place the core sample of test in sample pot, and sample pot is positioned in thermostatic box, for sample pot provides test required temperature, thermostatic box can provide the probe temperature of different range, by gas, by test gas (for example increase device, CH4, the absorbing gas such as CO2) inject in sample pot, and reach default test pressure value, can reach the test pressure requirement of different range, simultaneously, the pressure that pressure-loaded device provides stress loading device is converted to confession confined pressure and the axial compression of proposing to the core sample in sample pot.Because inventor finds in the prior art, test condition is only considered temperature, gaseous tension, this test condition (for example can not represent rock core gas, coal-seam gas and shale gas etc.) true adsorbed state in reservoir, therefore, pressure stress loading device being provided by pressure-loaded device is converted to confession confined pressure and the axial compression of proposing to the core sample in sample pot, realize test condition and considered temperature, in the time of gaseous tension, add confined pressure and axial compression, make test condition (for example more approach rock core gas, coal-seam gas and shale gas etc.) true adsorbed state in reservoir, simultaneously, the cavity that the pressure-loaded device adopting is column, can be by the cavity in pressure-loaded device equably for core sample provides confined pressure and axial compression simultaneously, avoided directly sample tank skin to exert pressure to provide confined pressure and axial compression and the inhomogeneous problem of pressure that causes, thereby the accuracy that has improved the measurement result of rock core gas original position absorption test, can provide more reliable isothermal adsorption curve and data for resource evaluation, individual well mining, numerical simulation etc.
By the structure shown in Fig. 1, the pressure and temperature data of the described sample pot after the injection test gas that the volume of tank 21 and the first pressure unit 23 gather per sample, calculate the isothermal adsorption amount of described core sample to described test gas.
During concrete enforcement, as shown in Figure 2, above-mentioned gas increases device 101 can be realized by gas cylinder 1, the first supercharge pump 2 and valve 3, gas cylinder 1 is connected with the first supercharge pump 2, the first supercharge pump 2 is connected with one end of valve 3, the other end of valve 3 increases the gas vent of device 101 as gas, is connected with one end of the first pressure unit 23, and then to the interior injecting gas of described sample pot 21.
During concrete enforcement, as shown in Figure 2, above-mentioned stress loading device 102 can be comprised of silicone oil bottle 26, supercharge pump 25 and the first valve 24, the entrance of described supercharge pump 25 is connected with described silicone oil bottle, one end of described the first valve 24 is connected with the outlet of described supercharge pump 25, the other end is the gas vent of described stress loading device 102, is connected with described pressure-loaded device 22, by described pressure-loaded device 22, provides confined pressure and axial compression for the core sample in described sample pot.
In order to calculate the free space volumes of sample pot in different pressures test process, change, and then obtain adsorbing really parameter, as Fig. 2, shown in 3, in the present embodiment, in described thermostatic box, also comprise: three-way switch valve 20, the second pressure unit 17, with reference to tank 18, proving tank 19 and the second valve 28, wherein, wherein, the gas access 201 of described three-way switch valve 20 is connected with the gas vent that described gas increases device 101, the gas vent 202 of described three-way switch valve 20 is connected with described sample pot 21, described the first pressure unit 23 is connected on the gas vent 202 and the pipeline between described sample pot 21 of described three-way switch valve 20, the mouth 203 of often outputing of described three-way switch valve 20 is connected with the described gas access with reference to tank 18, the described gas vent with reference to tank 18 is connected with one end of the second valve 28, the other end of described the second valve 28 is connected with the gas access of proving tank 19, what described the second pressure unit 17 was connected to described three-way switch valve 20 often outputs mouthfuls 203 and described with reference on the pipeline between the gas access of tank 18, described the second pressure unit 17 for example, for (gathering the described pressure and temperature data with reference to tank 18, described gas increase device 101 to described with reference to after tank 18 injecting gas, gather the described pressure and temperature data with reference to tank 18), described with reference to tank 18 and described proving tank 19 for injecting the gas of preset pressure value, for calculating the described volume with reference to tank, the volume of described proving tank and the described sample pot inner space volume under described default test pressure value provides data.
For example, by following steps, calculate the described volume with reference to tank, the volume of described proving tank, open the first stifled card 204 of the gas access 201 of described three-way switch valve 20, adopt described gas increase device 101 to described with reference to the interior injection preset pressure value of tank 18 (for example, 2 MPas) helium, close the first stifled card 204 of the gas access 201 of described three-way switch valve 20, described stable with reference to the interior gaseous tension of tank 18 after, described the second pressure unit 17 gathers the described temperature and pressure data with reference to tank 18, open described the second valve 28, described with reference to tank 18 and 19 connections of described proving tank, described stable with reference to tank 18 and the interior gaseous tension of described proving tank 19 after, described the second pressure unit 17 gathers the described temperature and pressure data with reference to tank 18, again repeat to the described process with reference to tank 18 and the interior injection helium of described proving tank 19, in this process, in described proving tank 19, be placed with the steel ball of known volume, described the second pressure unit 17 gathers the described temperature and pressure data with reference to tank 18, the described temperature and pressure data with reference to tank 18 that gather in the process of twice injection helium according to described the second pressure unit 17, set up system of equations, calculate the volume of the described volume with reference to tank 18 and described proving tank 19,
Then, open the first stifled card 204 of the gas access 201 of described three-way switch valve 20, to the described inert gas with reference to the interior injection original pressure of tank 18 value, described original pressure value (is for example greater than described default test pressure value, described original pressure value is 1.2 times of left and right of described default test pressure value), described stable with reference to tank 18 internal gas pressures after, open the second stifled card 205 of the gas vent 202 of described three-way switch valve 20, be communicated with described with reference to tank 18 and described sample pot 21, force value while stablizing with reference to tank 18 and described sample pot 21 internal gas pressures if described is described default test pressure value (or the absolute value of the difference of force value during stable gas pressure and described default test pressure value is not more than 0.1 MPa), according to described default test pressure value, described original pressure value and the described volume with reference to tank, set up system of equations, calculate the inner space volume of described sample pot under described default test pressure value,
Finally, open the first stifled card 204 of the gas access 201 of described three-way switch valve 20, adopt described gas increase device 101 to described with reference to the described test gas of the interior injection of tank 18, and reach described default test pressure value, described stable with reference to tank 18 internal gas pressures after, described the second pressure unit 17 gathers the described temperature and pressure data with reference to tank 18, open the second stifled card 205 of the gas vent 202 of described three-way switch valve 20, be communicated with described with reference to tank 18 and described sample pot 21, described stable with reference to tank 18 and described sample pot 21 internal gas pressures after, described the first pressure unit 23 gathers the temperature and pressure data of described sample pot 21, described the second pressure unit 17 gathers the described temperature and pressure data with reference to tank 18,
According to described the first pressure unit 23, gather to described sample pot 21, inject described test gas time temperature and pressure data, described the second pressure unit 17 gather to described temperature and pressure data, inner space volume and the described volume with reference to tank 18 of described sample pot 21 under described default test pressure value while injecting described test gas with reference to tank 18, calculate the isothermal adsorption amount of described core sample to described test gas.
In order to meet different testing requirements, in embodiments of the present invention, in the described thermostatic box of rock core gas original position absorption proving installation, also comprise: a plurality of described pressure-loaded devices, a plurality of described sample pots, a plurality of described the first pressure units, a plurality of described the second pressure units, a plurality of described three-way switch valves, a plurality of described with reference to tank, a plurality of described proving tanks and a plurality of described the second valve, wherein, described in each, sample pot is sleeved in a described pressure-loaded device, described in each, pressure-loaded device is connected with the gas vent of described stress loading device, described in each, sample pot is connected with the gas vent of a described three-way switch valve, the gas access of this described three-way switch valve is connected with the gas vent that described gas increases device, the mouth of often outputing of this described three-way switch valve is connected with a described gas access with reference to tank, this the described gas vent with reference to tank is connected with one end of described second valve, the other end of this described second valve is connected with the gas access of a described proving tank, described in each, the first pressure unit is connected on the gas vent and the pipeline between a described sample pot of a described three-way switch valve, the gas that described in each, the second pressure unit is connected to a described three-way switch valve often output mouthful and one described with reference on the pipeline between tank.
For example, as shown in Figure 2, a plurality of described pressure-loaded devices, a plurality of described sample pots, a plurality of described the first pressure units, a plurality of described the second pressure units, a plurality of described three-way switch valves, a plurality of described with reference to tank, the i of take in a plurality of described proving tanks and a plurality of described the second valve is individual is example, describe connected mode in detail, i sample pot 15 is placed in described thermostatic box 27, i sample pot 15 is sleeved in i pressure-loaded device 16, i pressure-loaded device 16 is connected with the gas vent of described stress loading device, i sample pot 15 is connected with the gas vent of i three-way switch valve 14, the gas access of this i three-way switch valve 14 is connected with the gas vent that described gas increases device 101, the mouth of often outputing of this i three-way switch valve 14 is connected with i the gas access with reference to tank 12, this i the gas vent with reference to tank 12 is connected with one end of i the second valve 29, the other end of this i the second valve 29 is connected with the gas access of i proving tank 13, i the first pressure unit 30 is connected on the pipeline between i sample pot 15 and the gas vent of i three-way switch valve 14, i the second pressure unit 11 be connected to often outputing mouthful of i three-way switch valve 14 and i individual with reference on the pipeline between the gas access of tank 12.
For convenient, sample pot is lifted out to described thermostatic box loads and unloads sample or be reduced in described thermostatic box and test, in the present embodiment, as shown in Figure 2, also comprise: lifting table 4 (or 5), be connected with the gas access end of described three-way switch valve 20 (or 14), described lifting table is for promoting or reducing described three-way switch valve 20 (or 14), related described sample pot 21 (or 15) is lifted out to described thermostatic box or is reduced in described thermostatic box.
For improving the accuracy of measurement data, in the present embodiment, as shown in Figure 2, also comprise: the 3rd valve 6, one end of described the 3rd valve 6 is connected with the gas access of described three-way switch valve 20 (or 14); Vacuum pump 7, is connected with the other end of described the 3rd valve 6, and described vacuum pump 7 is for getting rid of described sample pot 21 (or 15), described with reference to the air in tank 18 (or 12) and described proving tank 19 (or 13).
In order to improve conventional efficient and control accuracy, reduce the error that manual operation may cause, in the present embodiment, as shown in Figure 2, also comprise:
Computing machine 10, is connected with described the second pressure unit 17 (or 11) with described the first pressure unit 23 (or 30) by data line 9, the pressure and temperature data that gather for obtaining described the first pressure unit and described the second pressure unit; And (for example increase device 101 with described gas, the first supercharge pump 2 increasing in device 101 with described gas is connected with valve 3) and described stress loading device 102 is (for example, be connected with the first valve 24 with the supercharge pump 25 in described stress loading device 102) connect, for controlling described gas, increase the opening and closing of device and described stress loading device.
In order to provide confined pressure and axial compression to the core sample in sample pot better, this sample pot can be set to cavity closed at both ends, column.Meanwhile, for enough core sample amounts are provided, avoid the moisture in sample larger to tests affect, improve the representativeness of sample, the diameter of described sample pot is can 3.8 centimetres, length can be 10 centimetres.
The embodiment of the present invention also provides a kind of method of work of above-mentioned rock core gas original position absorption proving installation, and as shown in Figure 4, the method comprises:
Step 401: described core sample is placed in described sample pot;
Step 402: described sample pot is placed in the described pressure-loaded device in described thermostatic box, and wherein, described pressure-loaded device is converted to for the pressure that described stress loading device is provided confined pressure and the axial compression providing to the core sample of described sample pot;
Step 403: adopt described gas to increase device and inject described test gas in described sample pot, and reach default test pressure value;
Step 404: obtain the pressure and temperature data of the described sample pot of described the first pressure unit collection, the pressure and temperature data of described sample pot, provide foundation for calculating described core sample to the isothermal adsorption amount of described test gas.
In order further to improve the accuracy of measurement data, in the present embodiment, in described thermostatic box, also comprise: three-way switch valve, the second pressure unit, with reference to tank, proving tank and the second valve, wherein, the gas access of described three-way switch valve is connected with the gas vent that described gas increases device, the gas vent of described three-way switch valve is connected with described sample pot, described the first pressure unit is connected between the gas vent and described sample pot of described three-way switch valve, the mouth of often outputing of described three-way switch valve is connected with the described gas access with reference to tank, the described gas vent with reference to tank is connected with one end of the second valve, the other end of described the second valve is connected with the gas access of proving tank, described the second pressure unit is connected to often outputing mouthful of described three-way switch valve and described with reference on the pipeline between the gas access of tank, described method of work also comprises: double to described with reference to injecting the helium of preset pressure value in tank and described proving tank, wherein, when injecting helium for the second time, in described proving tank, be placed with the steel ball of known volume, according to described the second pressure unit, gather, the described temperature and pressure data with reference to tank after twice injecting gas, calculate the described volume with reference to tank, the volume of described proving tank,
To the described inert gas with reference to injecting original pressure value in tank, described original pressure value is greater than described default test pressure value, while being communicated with reference to tank and described sample pot if described, described is described default test pressure value with reference to tank and the stable force value of described sample pot internal gas pressure,, according to described default test pressure value, described original pressure value and the described volume with reference to tank, calculate the inner space volume of described sample pot under described default test pressure value;
Adopt described gas increase device to described with reference to injecting described test gas in tank, and reach default test pressure value, described the second pressure unit gathers the described temperature and pressure data with reference to tank, be communicated with describedly with reference to tank and described sample pot, described the first pressure unit gathers the temperature and pressure data of described sample pot;
According to the described temperature and pressure data with reference to tank of described the second pressure unit collection, described the first pressure unit, gather the temperature and pressure data of described sample pot, described sample pot inner space volume and the described volume with reference to tank under described default test pressure value, calculate the isothermal adsorption amount of described core sample to described test gas.
The method of work of describing above-mentioned rock core gas original position absorption proving installation below in conjunction with specific embodiment in detail, the method comprises:
Step 1: preparation of samples.Prepare column coal petrography or shale sample, the diameter 2.5cm of general sample, length 5cm left and right, packs in sample pot 21 (or 15), and stress loading device is offering sample confined pressure and the axial compression in sample pot 21 (or 15) by pressure-loaded device 22 (or 16) simultaneously.
Step 2: vacuumize.Valve-off 3, the four valve 8, the first valves 24; Control the first stifled card 204 of three-way switch valve 20 (or 14) gas access 201 and open, be communicated with gas access 201; Control the second stifled card 205 of three-way switch valve 20 (or 14) gas vent 202 in closing, cut off sample pot 21 (or 15).
Step 3: calculate with reference to tank and proving tank volume: control three-way switch valve 20 (or 14), inject the helium of 2MPa left and right extremely with reference to tank 18 (or 12), stablize after several minutes, the second pressure unit 17 (or 11) records temperature and pressure data, open the second valve 28 (or 29), UNICOM, with reference to tank 18 (or 12) and proving tank 19 (or 13), stablizes after several minutes, and the second pressure unit 17 (or 11) records temperature and pressure data, opening proving tank 19 (or 13) puts into after the steel ball of known volume, inject the helium of 2MPa left and right extremely with reference to tank 18 (or 12), stablize after several minutes, the second pressure unit 17 (or 11) records temperature and pressure data, open the second valve 28 (or 29), UNICOM is with reference to tank 18 (or 12) and proving tank 19 (or 13), stablize after several minutes, the second pressure unit 17 (or 11) records temperature and pressure data, according to described the second pressure unit, gather, the described temperature and pressure data with reference to tank after twice injecting gas, calculate the described volume with reference to tank, the volume of described proving tank.
The isothermal adsorption experiment of the absorbing gas such as step 4:CH4, CO2 (being described test gas).Computer is controlled the first supercharge pump 2 to noting absorbing gas to adsorbing goal pressure (being described default test pressure value) with reference to tank 18 (or 12), stablize after several minutes, disconnect the first stifled card 204, and open second and block up card 205, connection with reference to tank with reference to tank 18 (or 12) and sample pot 21 (or 15), until absorption reaches balance, and the first pressure unit 23 (or 30) collecting temperature and pressure data.Repeating step 4 is proceeded next spot pressure adsorption experiment.
The plan isothermal adsorption test of the inert gases such as step 5:He.
A: computer control the first supercharge pump 2 to reference to tank 81 (or 12) inert gas injection to proofreading and correct original pressure (being set as 1.2 times of left and right of corresponding adsorption site pressure P 0), stablize after several minutes, the second pressure unit 17 (or 11) collecting temperature and pressure data, disconnect the first stifled card 204, and open second and block up card 205, connection is with reference to tank 18 (or 12) and sample pot 21 (or 15), after stable number certain hour, the first pressure unit 23 (or 30) collecting temperature and pressure data acquisition correction equalized pressure.If the difference of correction of a final proof equalized pressure and P0 is not more than 0.1MPa, intend isothermal adsorption test and finish, otherwise:
Open valve the 36 and vacuum pump 7, to vacuumizing with reference to tank 18 (or 12) and sample pot 18 (or 15), then circulation A step, new correction original pressure P1 '=P0*P1/P2 wherein, P0 is constant, the correction original pressure that P1 circulated last time, P2 is the correction equalized pressure of circulation last time.
Step 6: the pressure, the temperature that are gathered by step 3,4, integrating step 5 correction of a final proof equalized pressures, calculate the adsorbance of each spot pressure.
In the invention process, by place the core sample of test in sample pot, and sample pot is positioned in thermostatic box, for sample pot provides test required temperature, thermostatic box can provide the probe temperature of different range, by gas, increasing device injects test gas in sample pot, and reach default test pressure value, can reach the test pressure requirement of different range, meanwhile, the pressure that pressure-loaded device provides stress loading device is converted to confession confined pressure and the axial compression of proposing to the core sample in sample pot.Because inventor finds in the prior art, test condition is only considered temperature, gaseous tension, this test condition (for example can not represent rock core gas, coal-seam gas and shale gas etc.) true adsorbed state in reservoir, therefore, pressure stress loading device being provided by pressure-loaded device is converted to confession confined pressure and the axial compression of proposing to the core sample in sample pot, realize test condition and considered temperature, in the time of gaseous tension, increase confined pressure and axial compression, make test condition (for example more approach rock core gas, coal-seam gas and shale gas etc.) true adsorbed state in reservoir, simultaneously, the cavity that the pressure-loaded device adopting is column, can be by the cavity in pressure-loaded device equably for core sample provides confined pressure and axial compression simultaneously, avoided directly sample tank skin to exert pressure to provide confined pressure and axial compression and the inhomogeneous problem of pressure that causes, thereby the accuracy that has improved the measurement result of rock core gas original position absorption test, can provide more reliable isothermal adsorption curve and data for resource evaluation, individual well mining, numerical simulation etc.
Obviously, those skilled in the art should be understood that, each module of the above-mentioned embodiment of the present invention or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in memory storage and be carried out by calculation element, and in some cases, can carry out shown or described step with the order being different from herein, or they are made into respectively to each integrated circuit modules, or a plurality of modules in them or step are made into single integrated circuit module to be realized.Like this, the embodiment of the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the embodiment of the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (11)
1. a rock core gas original position absorption proving installation, is characterized in that, comprising:
Thermostatic box, for providing test required temperature, is provided with sample pot, the first pressure unit and pressure-loaded device in described thermostatic box, described thermostatic box is provided with gas outward increases device and stress loading device, wherein,
Described sample pot, for placing core sample to be tested;
The gas vent that described gas increases device is connected with described sample pot, and described gas increases device for inject test gas in described sample pot, and reaches default test pressure value;
Described the first pressure unit is connected to described gas to be increased on the gas vent and the pipeline between described sample pot of device, and described the first pressure unit is for gathering the pressure and temperature data of described sample pot;
The gas vent of described stress loading device is connected with described pressure-loaded device, and described stress loading device is for providing pressure to described pressure-loaded device;
Described pressure-loaded device is converted to for the pressure that described stress loading device is provided confined pressure and the axial compression providing to the core sample of described sample pot, the cavity that described pressure-loaded device is column, and described sample pot is sleeved in described pressure-loaded device.
2. rock core gas original position is adsorbed proving installation as claimed in claim 1, it is characterized in that, described stress loading device comprises:
Silicone oil bottle;
Supercharge pump, the entrance of described supercharge pump is connected with described silicone oil bottle;
The first valve, one end of described the first valve is connected with described supercharging delivery side of pump, and the other end is the gas vent of described stress loading device, is connected with described pressure-loaded device.
3. rock core gas original position is adsorbed proving installation as claimed in claim 1, it is characterized in that, in described thermostatic box, also comprises:
Three-way switch valve, the second pressure unit, with reference to tank, proving tank and the second valve,
Wherein, the gas access of described three-way switch valve is connected with the gas vent that described gas increases device, the gas vent of described three-way switch valve is connected with described sample pot, described the first pressure unit is connected on the gas vent and the pipeline between described sample pot of described three-way switch valve, the mouth of often outputing of described three-way switch valve is connected with the described gas access with reference to tank, the described gas vent with reference to tank is connected with one end of the second valve, the other end of described the second valve is connected with the gas access of proving tank, described the second pressure unit is connected to often outputing mouthful of described three-way switch valve and described with reference on the pipeline between the gas access of tank,
Described the second pressure unit is used for, and gathers the described pressure and temperature data with reference to tank;
Described with reference to tank and described proving tank for injecting the gas of preset pressure value, for calculate described with reference to the volume of tank, the volume of described proving tank and the described sample pot inner space volume under described default test pressure value provides data.
4. rock core gas original position is adsorbed proving installation as claimed in claim 3, it is characterized in that, in described thermostatic box, also comprises:
A plurality of described pressure-loaded devices, a plurality of described sample pot, a plurality of described the first pressure unit, a plurality of described the second pressure unit, a plurality of described three-way switch valve, a plurality of described with reference to tank, a plurality of described proving tank and a plurality of described the second valve, wherein
Described in each, sample pot is sleeved in a described pressure-loaded device, described in each, pressure-loaded device is connected with the gas vent of described stress loading device, described in each, sample pot is connected with the gas vent of a described three-way switch valve, the gas access of this described three-way switch valve is connected with the gas vent that described gas increases device, the mouth of often outputing of this described three-way switch valve is connected with a described gas access with reference to tank, this the described gas vent with reference to tank is connected with one end of described second valve, the other end of this described second valve is connected with the gas access of a described proving tank, described in each, the first pressure unit is connected on the gas vent and the pipeline between a described sample pot of a described three-way switch valve, the gas that described in each, the second pressure unit is connected to a described three-way switch valve often output mouthful and one described with reference on the pipeline between the gas access of tank.
5. rock core gas original position is adsorbed proving installation as claimed in claim 3, it is characterized in that, also comprises:
Lifting table, is connected with the gas access end of described three-way switch valve, and described lifting table is for promoting or reducing described three-way switch valve, related described sample pot is lifted out to described thermostatic box or is reduced in described thermostatic box.
6. rock core gas original position is adsorbed proving installation as claimed in claim 3, it is characterized in that, also comprises:
The 3rd valve, described the 3rd one end of valve and the gas access of described three-way switch valve are connected;
Vacuum pump, is connected with the other end of described the 3rd valve, and described vacuum pump is for getting rid of described sample pot, described with reference to the air in tank and described proving tank.
7. rock core gas original position is adsorbed proving installation as claimed in claim 3, it is characterized in that, also comprises:
Computing machine, is connected with described the second pressure unit with described the first pressure unit, the pressure and temperature data that gather for obtaining described the first pressure unit and described the second pressure unit; And be connected with described stress loading device with described gas increase device, for controlling described gas, increase the opening and closing of device and described stress loading device.
8. rock core gas original position absorption proving installation as described in any one in claim 1 to 7, is characterized in that described sample pot cavity that be closed at both ends, column.
9. rock core gas original position absorption proving installation as claimed in claim 8, is characterized in that, the diameter of described sample pot is that 3.8 centimetres, length are 10 centimetres.
10. the method for work that in claim 1 to 9, described in any one, rock core gas original position is adsorbed proving installation, is characterized in that, comprising:
Described core sample is placed in described sample pot;
Described sample pot is placed in the described pressure-loaded device in described thermostatic box, and wherein, described pressure-loaded device is converted to for the pressure that described stress loading device is provided confined pressure and the axial compression providing to the core sample of described sample pot;
Adopt described gas to increase device and inject described test gas in described sample pot, and reach default test pressure value;
The pressure and temperature data of obtaining the described sample pot of described the first pressure unit collection, the pressure and temperature data of described sample pot, provide foundation for calculating described core sample to the isothermal adsorption amount of described test gas.
11. method of works that rock core gas original position is adsorbed proving installation as claimed in claim 10, is characterized in that, in described thermostatic box, also comprise:
Three-way switch valve, the second pressure unit, with reference to tank, proving tank and the second valve, wherein, the gas access of described three-way switch valve is connected with the gas vent that described gas increases device, the gas vent of described three-way switch valve is connected with described sample pot, described the first pressure unit is connected on the gas vent and the pipeline between described sample pot of described three-way switch valve, the mouth of often outputing of described three-way switch valve is connected with the described gas access with reference to tank, the described gas vent with reference to tank is connected with one end of the second valve, the other end of described the second valve is connected with the gas access of proving tank, described the second pressure unit is connected to often outputing mouthful of described three-way switch valve and described with reference on the pipeline between the gas access of tank, described method of work also comprises:
Double to described with reference to injecting the helium of preset pressure value in tank and described proving tank, wherein, when injecting helium for the second time, in described proving tank, be placed with the steel ball of known volume, according to described the second pressure unit, gather, described temperature and pressure data with reference to tank after twice injecting gas, calculate described with reference to the volume of tank, the volume of described proving tank;
To the described inert gas with reference to injecting original pressure value in tank, described original pressure value is greater than described default test pressure value, while being communicated with reference to tank and described sample pot if described, described is described default test pressure value with reference to tank and the stable force value of described sample pot internal gas pressure,, according to described default test pressure value, described original pressure value and the described volume with reference to tank, calculate the inner space volume of described sample pot under described default test pressure value;
Adopt described gas increase device to described with reference to injecting described test gas in tank, and reach default test pressure value, described the second pressure unit gathers the described temperature and pressure data with reference to tank, be communicated with describedly with reference to tank and described sample pot, described the first pressure unit gathers the temperature and pressure data of described sample pot;
According to the described temperature and pressure data with reference to tank of described the second pressure unit collection, described the first pressure unit, gather the temperature and pressure data of described sample pot, described sample pot inner space volume and the described volume with reference to tank under described default test pressure value, calculate the isothermal adsorption amount of described core sample to described test gas.
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| CN112378812A (en) * | 2020-11-06 | 2021-02-19 | 西南石油大学 | Experimental device and method for determining desorption rate of adsorption type shale gas |
| CN112697632A (en) * | 2020-12-04 | 2021-04-23 | 中国石油天然气股份有限公司 | Coal rock and shale bulk sample weight method isothermal adsorption measurement device and method |
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