CN103439356A - Experimental apparatus and method for constant-pressure specific heat measurement of supercritical carbon dioxide - Google Patents
Experimental apparatus and method for constant-pressure specific heat measurement of supercritical carbon dioxide Download PDFInfo
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- CN103439356A CN103439356A CN2013102211002A CN201310221100A CN103439356A CN 103439356 A CN103439356 A CN 103439356A CN 2013102211002 A CN2013102211002 A CN 2013102211002A CN 201310221100 A CN201310221100 A CN 201310221100A CN 103439356 A CN103439356 A CN 103439356A
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Abstract
The invention relates to an experimental apparatus and a method for constant-pressure specific heat measurement of supercritical carbon dioxide. The experiment apparatus for the constant-pressure specific heat measurement of supercritical carbon dioxide comprises a supercritical carbon dioxide circulating system and an injection water cycling system, wherein the supercritical carbon dioxide circulating system comprises a measurement pipeline section inner tube; the injection water cycling system comprises a measurement pipeline section outer tube; water flows between the measurement pipeline section outer tube and the measurement pipeline section inner tube; the supercritical carbon dioxide circulating system provides a closed circulation loop at a high temperature and a high pressure for carbon dioxide; and the injection water cycling system realizes heat exchange of supercritical carbon dioxide in the measurement pipeline section inner tube. The experimental apparatus and method can realize the constant-pressure specific heat measurement of supercritical carbon dioxide in relatively large pressure and temperature ranges; and the constant-pressure specific heat of supercritical carbon dioxide at different temperatures and pressures can be obtained. The apparatus is simple; operations are convenient and feasibility is high. A measurement method is scientific and can realize relatively high precision parameter measurement.
Description
Technical field
The invention belongs to unconventional oil-gas mining technical field, particularly, relate to a kind of experimental provision and method of measuring for the supercritical carbon dioxide specific heat at constant pressure.
Background technology
Along with national economic development to the sharp increase of oil gas demand for energy and the enforcement of oil gas energy new strategy, the oil-gas exploration and development field is constantly expanded, from the oil gas field of the good geologic condition such as self-contained, high pressure, middle and high infiltration uniform sandstone, the unconventional gas resourcess such as maturing field, tight gas, shale gas and coal-seam gas of complex fault block, hypotonic, heavy crude reservoir, pressure exhaustion have been transferred to gradually.Unconventional gas reservoir generally is low-porosity, low-permeability, the physical property characteristic of low pore throat radius, and the resistance ratios conventional gas and oil of air-flow is hidden much bigger, and, along with the increase of buried depth, it is poorer that physical property can become.For the exploitation of the unconventional hydrocarbon-bearing pools such as tight gas, shale gas, the brill completion technique of protection hydrocarbon zone can effectively improve the ultimate recovery factor of unconventional hydrocarbon-bearing pool.
Supercritical carbon dioxide has high density, low viscosity, low surface tension, high coefficient of diffusion, and has good heat transfer, mass-transfer performance.Use supercritical carbon dioxide to bore completion to not injury of reservoir, can effectively avoid near wellbore formation to stop up, protect hydrocarbon zone, improve reservoir permeability.The excellent specific property that supercritical carbon dioxide fluid has due to himself makes it become a kind of protection hydrocarbon zone that has application potential and bores the well completion fluid medium.At present, be subject to temperature, pressure influence, supercritical carbon dioxide HEAT TRANSFER LAW very complex, under High Temperature High Pressure, the gained test figure is less, for the also explanation of neither one system of mechanism of conducting heat, thereby becomes a difficult point of supercritical fluid field of heat transfer.The supercritical carbon dioxide specific heat at constant pressure is the important parameter that HEAT TRANSFER LAW is analyzed, and it is very large that research shows that the carbon dioxide specific heat at constant pressure is affected by temperature, pressure, particularly at Near The Critical Point, changes violent.Be subject to the measurement of supercritical carbon dioxide specific heat at constant pressure to be difficult to realize the restriction of high temperature and pressure experiment condition, most experts and scholars be take numerical simulation analysis as Main Means, and the accuracy of its result of calculation awaits experimental verification.
Summary of the invention
For overcoming the defect of prior art, the invention provides a kind of experimental provision and method of measuring for the supercritical carbon dioxide specific heat at constant pressure, this experimental provision is simple to operate, method is easy to implement, can measure fast the specific heat at constant pressure of supercritical carbon dioxide under different Temperature-pressure Conditions, take experimental result as foundation, analyze stream of supercritical carbon dioxide and move and heat-transfer mechanism, for supercritical carbon dioxide bores, Well Completion Engineering of Oil Reservoirs designs and theoretical research provides experiment basis.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is as follows:
A kind of experimental provision of measuring for the supercritical carbon dioxide specific heat at constant pressure, comprise: the supercritical carbon dioxide circulation system and the injected water circulation system, it is characterized in that: the supercritical carbon dioxide circulation system comprises measuring tube line segment inner tube, and the injected water circulation system comprises measuring tube line segment outer tube; In the annular space of water between measuring tube line segment outer tube, measuring tube line segment inner tube, flow; The supercritical carbon dioxide circulation system provides closed circuit closed under High Temperature High Pressure for carbon dioxide; The injected water circulation system realizes that supercritical carbon dioxide carries out heat interchange in measuring tube line segment inner tube.
The experimental technique of measuring for the supercritical carbon dioxide specific heat at constant pressure, adopt the above-mentioned experimental provision of measuring for the supercritical carbon dioxide specific heat at constant pressure, it is characterized in that, while carrying out supercritical carbon dioxide specific heat at constant pressure experiments of measuring, carbon dioxide in carbon dioxide air source reaches supercriticality by the supercharging of gas boosting pump and the heating of heating system, by adjustments of gas supercharge pump and heating system, reach the pressure and temperature condition of expection, open gas circulator and start circulation, the injected water system also starts recycle back simultaneously, after flow parameter is stable, image data, and calculated the supercritical carbon dioxide specific heat at constant pressure and measured.
With respect to prior art, beneficial effect of the present invention is as follows: (1), can realize the measurement of the specific heat at constant pressure of larger pressure and temperature wide-ultra critical carbon dioxide can obtaining supercritical carbon dioxide specific heat at constant pressure under different Temperature-pressure Conditions; (2), equipment is simple, easy to operate, feasibility is high; (3), the measuring method science, can realize the parameter measurement of degree of precision.
The accompanying drawing explanation
Fig. 1 is supercritical carbon dioxide specific heat at constant pressure experiments of measuring device schematic diagram of the present invention.
In figure: 1, carbon dioxide air source; 2, gas buffer tank; 3, gas boosting pump; 4, heating system; 5, gas meter; 6, pressure gauge; 7, carbon dioxide inlet is measured thermometer; 8, measuring tube line segment inner tube; 9, thermometer is measured in the carbon dioxide outlet; 10, cooling device; 11, gas circulator; 12, water pot; 13, water circulating pump; 14, electromagnetic flowmeter; 15, water inlet is measured thermometer; 16, measuring tube line segment outer tube; 17, water out is measured thermometer.
Embodiment
As shown in Figure 1, the experimental provision of measuring for the supercritical carbon dioxide specific heat at constant pressure, comprising: the supercritical carbon dioxide circulation system and the injected water circulation system.The supercritical carbon dioxide circulation system provides closed circuit closed under High Temperature High Pressure for carbon dioxide; The injected water circulation system realizes that supercritical carbon dioxide carries out heat interchange in measuring tube line segment inner tube.
The supercritical carbon dioxide circulation system comprises: carbon dioxide air source 1, gas buffer tank 2, gas boosting pump 3, heating system 4, gas meter 5, measuring tube line segment inner tube 8, cooling device 10, gas circulator 11; Gas buffer tank 2, gas boosting pump 3, heating system 4, gas meter 5, measuring tube line segment inner tube 8, cooling device 10, gas circulator 11 connect to form airtight cyclic system successively by pipeline, and carbon dioxide is along gas buffer tank 2 to gas boosting pump 3 sealing and circulating; Carbon dioxide air source 1 is connected with gas buffer tank 2.In airtight loop, all parts and pipeline be withstand voltage 60MPa all, and upper temperature limit is 500K, can realize the experiment measuring of supercritical carbon dioxide specific heat at constant pressure under High Temperature High Pressure.Carbon dioxide air source 1 provides experiment carbon dioxide used, gas buffer tank 2 stores the carbon dioxide of high pressure, gas boosting pump 3 is that the carbon dioxide supercharging is to meet the experimental pressure requirement, 4 pairs of carbon dioxide of heating system heat to meet the experimental temperature requirement, gas meter 5 is measured the mass rate of carbon dioxide in the carbon dioxide circulation line, measuring tube line segment inner tube 8 provides flow channel for stream of supercritical carbon dioxide is moving, cooling device 10 cools for supercritical carbon dioxide, to meet requirement for experiment condition next time, gas circulator 11 provides the power of closed circulation for carbon dioxide.The copper pipe that measuring section pipeline inner tube 8 is internal diameter 8mm, wall thickness 2mm, length 5m.
The injected water circulation system comprises water pot 12, water circulating pump 13, electromagnetic flowmeter 14, measuring tube line segment outer tube 16; Water pot 12, water circulating pump 13, electromagnetic flowmeter 14, measuring tube line segment outer tube 16 connect to form airtight cyclic system successively by pipeline, and water follows ring water pump 13 to electromagnetic flowmeter 14 circulations; Water pot 12 provides experiment water used, and water circulating pump 13 is the power of water extraction for closed circulation, and electromagnetic flowmeter 14 is for measuring the mass rate of water circulation pipe water.
Measuring tube line segment outer tube 16 inflow points install water inlet and measure thermometer 15, and measuring tube line segment outer tube 16 exits are installed water out and measured thermometer 17.Water inlet is measured the water inlet temperature that thermometer 15 is measured measuring tube line segment outer tube 16, and water out is measured the water outlet temperature that thermometer 17 is measured measuring tube line segment outer tube 16.Measuring tube line segment inner tube 8 is nested among measuring tube line segment outer tube 16, the copper pipe that measuring tube line segment outer tube 16 is internal diameter 16mm, wall thickness 1mm, length 4.6m, and measuring tube line segment inner tube 8 two ends are the mobile stable section of reserved 0.2m respectively.In the annular space of water between measuring tube line segment outer tube 16, measuring tube line segment inner tube 8 with respect to supercritical carbon dioxide closed loop reversed flow.
While carrying out supercritical carbon dioxide specific heat at constant pressure experiments of measuring, carbon dioxide in carbon dioxide air source 1 reaches supercriticality by the supercharging of gas boosting pump 3 and the heating of heating system 4, by adjustments of gas supercharge pump 3 and heating system 4, reach the pressure and temperature condition of expection, open gas circulator 11 and start circulation, the injected water system also starts recycle back simultaneously, after flow parameter is stable, image data, supercritical carbon dioxide specific heat at constant pressure assay method is specific as follows:
(1), open experimental facilities, set up circulation, stablize 2min;
(2), read the temperature that carbon dioxide inlet is measured thermometer 7
the temperature of thermometer 9 is measured in the carbon dioxide outlet
(3), read the temperature T that water inlet is measured thermometer 15
win, water out measures the temperature T of thermometer 17
wout;
(4), read the reading of gas meter 5, obtain the mass rate of carbon dioxide
(5), read the reading of electromagnetic flowmeter 14, obtain the mass rate m of water
w;
(6), calculate the specific heat at constant pressure of supercritical carbon dioxide
In formula,
for the specific heat at constant pressure of supercritical carbon dioxide, J/ (kgK); m
wfor the mass rate of water, kg/s; C
pwfor the specific heat at constant pressure of water, get 4186J/ (kgK); T
winfor water inlet temperature, K; T
woutfor water outlet temperature, K;
for the mass rate of supercritical carbon dioxide, kg/s;
for supercritical carbon dioxide inlet temperature, K;
for supercritical carbon dioxide outlet temperature, K.
Pass through to change the conditions such as temperature, pressure, flow in experimentation, can study the supercritical carbon dioxide specific heat at constant pressure situation of change under different operating modes, thereby the heat-transfer mechanism of research supercritical carbon dioxide, for supercritical carbon dioxide bores, Well Completion Engineering of Oil Reservoirs designs and theoretical research provides experiment basis.
Claims (10)
1. an experimental provision of measuring for the supercritical carbon dioxide specific heat at constant pressure, comprise: the supercritical carbon dioxide circulation system and the injected water circulation system, it is characterized in that: the supercritical carbon dioxide circulation system comprises measuring tube line segment inner tube, and the injected water circulation system comprises measuring tube line segment outer tube; In the annular space of water between measuring tube line segment outer tube, measuring tube line segment inner tube, flow; The supercritical carbon dioxide circulation system provides closed circuit closed under High Temperature High Pressure for carbon dioxide; The injected water circulation system realizes that supercritical carbon dioxide carries out heat interchange in measuring tube line segment inner tube.
2. the experimental provision of measuring for the supercritical carbon dioxide specific heat at constant pressure according to claim 1, it is characterized in that, the supercritical carbon dioxide circulation system comprises: carbon dioxide air source, gas buffer tank, gas boosting pump, heating system, gas meter, measuring tube line segment inner tube, cooling device, gas circulator; Gas buffer tank, gas boosting pump, heating system, gas meter, measuring tube line segment inner tube, cooling device, gas circulator connect to form airtight cyclic system successively by pipeline, and carbon dioxide is along the gas buffer tank to gas boosting pump sealing and circulating.
3. according to the described experimental provision of measuring for the supercritical carbon dioxide specific heat at constant pressure of claim 1-2, it is characterized in that, pressure gauge, carbon dioxide inlet measurement thermometer are installed on the pipeline between gas meter, measuring tube line segment inner tube, pressure gauge is measured between thermometer at gas meter and carbon dioxide inlet, and carbon dioxide inlet is measured thermometer and arranged near measuring tube line segment inner tube; The carbon dioxide outlet is installed on the associated line between measuring tube line segment inner tube, cooling device and measures thermometer, the carbon dioxide outlet is measured thermometer and is arranged near measuring tube line segment inner tube.
4. according to the described experimental provision of measuring for the supercritical carbon dioxide specific heat at constant pressure of claim 1-3, it is characterized in that, the injected water circulation system comprises water pot, water circulating pump, electromagnetic flowmeter, measuring tube line segment outer tube; Water pot, water circulating pump, electromagnetic flowmeter, measuring tube line segment outer tube connect to form airtight cyclic system successively by pipeline, and water follows the ring water pump and circulates to electromagnetic flowmeter.
5. according to the described experimental provision of measuring for the supercritical carbon dioxide specific heat at constant pressure of claim 1-4, it is characterized in that, measuring tube line segment outer tube inflow point installs water inlet and measures thermometer, and measuring tube line segment outer tube exit is installed water out and measured thermometer.
6. according to the described experimental provision of measuring for the supercritical carbon dioxide specific heat at constant pressure of claim 1-5, it is characterized in that, in the annular space of water between measuring tube line segment outer tube, measuring tube line segment outer tube with respect to supercritical carbon dioxide closed loop reversed flow.
7. according to the described experimental provision of measuring for the supercritical carbon dioxide specific heat at constant pressure of claim 1-6, it is characterized in that, the copper pipe that measuring section pipeline inner tube is internal diameter 8mm, wall thickness 2mm, length 5m, the copper pipe that measuring tube line segment outer tube is internal diameter 16mm, wall thickness 1mm, length 4.6m, measuring tube line segment inner tube is nested among measuring tube line segment outer tube, and measuring tube line segment inner tube two ends are the mobile stable section of reserved 0.2m respectively.
8. the experimental technique of measuring for the supercritical carbon dioxide specific heat at constant pressure, adopt the described experimental provision of measuring for the supercritical carbon dioxide specific heat at constant pressure of claim 1-7, it is characterized in that, while carrying out supercritical carbon dioxide specific heat at constant pressure experiments of measuring, carbon dioxide in carbon dioxide air source reaches supercriticality by the supercharging of gas boosting pump and the heating of heating system, by adjustments of gas supercharge pump and heating system, reach the pressure and temperature condition of expection, open gas circulator and start circulation, the injected water system also starts recycle back simultaneously, after flow parameter is stable, image data, and calculated the supercritical carbon dioxide specific heat at constant pressure and measured.
9. the experimental technique of measuring for the supercritical carbon dioxide specific heat at constant pressure according to claim 8, is characterized in that, supercritical carbon dioxide specific heat at constant pressure assay method is specific as follows:
(1), open experimental facilities, foundation circulation;
(2), read the temperature that carbon dioxide inlet is measured the temperature of thermometer, carbon dioxide outlet measurement thermometer;
(3), read the temperature that water inlet is measured the temperature of thermometer, water out measurement thermometer;
(4), read the reading of gas meter, obtain the mass rate of carbon dioxide;
(5), read the reading of electromagnetic flowmeter, obtain the mass rate of water;
(6), calculate the specific heat at constant pressure of supercritical carbon dioxide:
In formula,
for the specific heat at constant pressure of supercritical carbon dioxide, J/ (kgK); m
wfor the mass rate of water, kg/s; C
pwfor the specific heat at constant pressure of water, get 4186J/ (kgK); T
winfor water inlet temperature, K; T
woutfor water outlet temperature, K;
for the mass rate of supercritical carbon dioxide, kg/s;
for supercritical carbon dioxide inlet temperature, K;
for supercritical carbon dioxide outlet temperature, K.
10. the experimental technique of measuring for the supercritical carbon dioxide specific heat at constant pressure according to claim 8, is characterized in that, sets up the rear 2min that stablizes of circulation.
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| CN110456024A (en) * | 2019-08-23 | 2019-11-15 | 中国石油大学(华东) | A kind of method and system for analyzing gas hydrates stable region boundary carbon cycle process |
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| CN111398342B (en) * | 2020-04-16 | 2021-05-14 | 浙江大学 | Test method based on supercritical carbon dioxide differential scanning calorimeter |
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