CN113376218A - Oil-gas-water three-phase content integrated online measuring device in oil pipeline and using method - Google Patents
Oil-gas-water three-phase content integrated online measuring device in oil pipeline and using method Download PDFInfo
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- CN113376218A CN113376218A CN202110636846.4A CN202110636846A CN113376218A CN 113376218 A CN113376218 A CN 113376218A CN 202110636846 A CN202110636846 A CN 202110636846A CN 113376218 A CN113376218 A CN 113376218A
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Abstract
The invention discloses an oil-gas-water three-phase content integrated online measuring device in an oil conveying pipe and a using method thereof, and belongs to the technical field of automatic oil-gas metering. The device of the invention comprises: the device comprises an oil-gas-water three-phase separation column, a constant-pressure constant-speed pump, a piston type gas storage tank, a multi-point conductivity tester, an electric stirrer, a temperature/pressure sensor and corresponding automatic valves and pipelines. The invention also discloses a method for measuring the oil-gas-water three-phase content in the oil pipeline by adopting the device. The invention has simple structure and small test loss, can accurately test the content of oil, gas and water three phases in the oil pipeline with pressure in time, has high automation degree in the test process and reduces the workload of personnel.
Description
Technical Field
The invention belongs to the technical field of automatic oil-gas metering, and particularly relates to an oil-gas-water three-phase content integrated online measuring device in an oil conveying pipe and a using method.
Background
Crude oil is an extremely important fossil energy source, is also an important chemical raw material at the same time, and is known as industrial blood. The safe and efficient pipeline oil transportation can greatly reduce the running cost of the petroleum industry, save energy and reduce consumption. For crude oil pipeline transportation, the content of oil, gas and water is a main parameter, which not only relates to the problem of energy saving and consumption reduction during petroleum product transportation, but also is an important basis for selecting a subsequent ground treatment process and taking pipeline anti-corrosion measures.
At present, the measurement method of the oil-gas-water three-phase content in a crude oil pipeline mainly comprises two methods, one method is to directly adopt a multiphase flowmeter for measurement, and the other method is to carry out split-phase measurement of oil, gas and water after sampling. The direct measurement by adopting the multiphase flowmeter is more convenient and fast, the change of the oil-gas-water three-phase content can be fed back in real time, but the problems of high instrument price, strict requirement on application environment, lack of standard and standard of authentication and the like exist; the metering precision of the split-phase metering of the metal tank, the tank car and the like is high, but the metering loss is large, the testing time is long, the operation stability is poor and the like.
Therefore, the economical and efficient online oil-gas-water three-phase content measuring device for the oil pipeline can timely master the change of the oil-gas-water three-phase content in the oil pipeline, reduces the working strength of personnel, has important engineering significance for guaranteeing the safe and economic operation of the pipeline, and has no report of the device.
Disclosure of Invention
In view of the above, the present invention aims to provide a convenient and economical integrated online measurement apparatus for oil-gas-water three-phase content in an oil pipeline and a use method thereof, which are used for measuring the content change of oil-gas-water three-phase in the crude oil pipeline transmission process in real time.
In order to realize the aim of the invention, the invention provides an integrated online measuring device for the oil-gas-water three-phase content in an oil pipeline, which comprises a constant-pressure constant-speed pump, an oil-gas-water three-phase separation column, a piston type gas storage tank, a multi-point position conductivity tester, an electric stirrer, a stirring impeller, a temperature/pressure sensor, a corresponding automatic valve and a pipeline, wherein the constant-pressure constant-speed pump is connected with the oil pipeline to ensure real-time online sample acquisition, the constant-pressure constant-speed pump is connected with the oil-gas-water three-phase separation column to control the sample volume entering the oil-water separation column, the stirring impeller is positioned in the oil-gas-water three-phase separation column and is connected with the electric stirrer to accelerate the gas-liquid separation and the oil-water stratification by low-speed stirring, the piston type gas storage tank is connected with the oil-gas-water three-phase separation column to reduce the pressure in the oil-gas-water three-phase separation column and collect overflowed gas, the measuring point position of the multi-point position conductivity measuring instrument is positioned in the oil-gas-water three-phase separation column to reflect the position of an oil-water interface after oil-water separation, and the temperature/pressure sensor is positioned in the oil-water separation column and the piston type gas storage tank to test the change of temperature/pressure parameters in the gas-liquid separation process.
Preferably, the oil-gas-water three-phase separation column adopts a vertical structure, the volume is not less than 50 liters, and the length-diameter ratio is 5: 1-10: 1.
Preferably, the stirring impeller is Y-shaped or U-shaped, and the stirring speed is less than 50 revolutions per minute.
Preferably, the multi-point conductivity tester has 5 to 10 measurement points which are longitudinally distributed between the heights 1/10 to 7/10 of the oil-gas-water three-phase separation column.
The invention provides an integrated online measurement method for oil-gas-water three-phase content in an oil pipeline, which specifically comprises the following steps:
1. sample injection: controlling sample injection flow by using the constant-pressure constant-speed pump, taking a sample from an oil pipeline, injecting the sample into the oil-gas-water three-phase separation column, stopping the constant-pressure constant-speed pump after reaching a preset volume, and measuring temperature and pressure data in the oil-gas-water three-phase separation column by using the temperature/pressure sensor;
2. gas-liquid separation: the electric stirrer is used for stirring the sample at a low speed through the stirring impeller to accelerate gas-liquid separation, the piston type gas storage tank is used for reducing the pressure in the oil-gas-water three-phase separation column, and collecting the overflow gas, after the temperature/pressure sensor is used for measuring the temperature and pressure data in the piston type gas storage tank, discharging the collected gas, repeating the process until the pressure in the oil-gas-water three-phase separation column is reduced to the atmospheric pressure, calculating the volume of the gas separated in one time, namely the changed volume of the gas storage tank, namely the volume of the gas separated in one time, namely the volume of the gas separated in the previous time, namely the total volume of the liquid in the separation column, namely the pressure of the separation column, namely the normal pressure, namely the temperature of the separation column, namely the compression factor, through a real gas state equation;
3. oil-water separation: the electric stirrer is used for stirring the sample at a low speed through the stirring impeller to accelerate oil-water stratification, the multipoint conductivity tester is used for measuring the conductivity parameter change at different positions in the oil-gas-water three-phase separation column, and the free water content in the oil pipeline, namely the highest point height with increased conductivity multiplied by the cross section area of the separation column/the total volume of the liquid in the separation column multiplied by 100 percent, is calculated by combining the size of the oil-gas-water three-phase separation column;
4. emptying the separation column: after the test is finished, the piston type gas storage tank is utilized to pressurize the oil-gas-water three-phase separation column, and the tested sample is reinjected into an oil pipeline or discharged.
The invention is suitable for the on-line measurement of the oil-gas-water three-phase content in the oil pipeline under the condition of pressurized multiphase mixed transportation. The invention has simple structure and high automation degree, can accurately measure the content of oil, gas and water three phases, has short measuring period and small measuring loss in the measuring process, and provides a technical means for realizing the on-line measurement of the content of the oil, gas and water three phases in the oil pipeline.
Drawings
FIG. 1 is a schematic diagram of an integrated on-line measuring device for oil-gas-water three-phase content in an oil pipeline provided by the invention.
FIG. 2 is a schematic diagram showing the change of the electrical conductivity of different point positions in the oil-gas-water three-phase separation column along with the oil-water separation time.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described with reference to the accompanying drawings, but it should be understood that the scope of the present invention is not limited thereto.
As shown in fig. 1, the integrated online measuring device for oil-gas-water three-phase content in an oil pipeline provided by the invention comprises: the device comprises a constant-pressure constant-speed pump 1, an oil-gas-water three-phase separation column 2, a piston type gas storage tank 3, a multi-point conductivity tester 4, an electric stirrer 5, a stirring impeller 6, a temperature/pressure sensor A7, a temperature/pressure sensor B8, an oil inlet valve 9, a liquid inlet protection valve 10, a gas regulating valve 11, a pressure release valve 12 and a liquid discharge valve 13.
Constant voltage constant speed pump 1 links to each other with oil pipeline through inlet valve 9, links to each other with oil gas water three-phase separation post 2 through feed liquor protection valve 10, impeller 6 is in oil gas water three-phase separation post 2, links to each other with electric mixer 5, the multiple spot conductivity apparatus 4 is in oil gas water three-phase separation post 2 with the measuring point of temperature/pressure sensor first 7, piston gas holder 3 passes through gas control valve 11 and links to each other with oil gas water three-phase separation post 2, the measuring point of temperature/pressure sensor second 8 is in piston gas holder 3, and piston gas holder 3 passes through relief valve 12 pressure release, and oil water separation post 2 passes through flowing back valve 13 flowing back.
Keep before the test experiment begins oil gas water three-phase separation column 2 is perpendicular with ground, keeps piston gas holder 3 is in minimum volume state (0L), guarantees that all valves are in the closed condition, oil gas water three-phase separation column 2 volumes is 50L, 3 volumes of piston gas holder are 20L, 5 dot positions of multipoint conductivity apparatus 4 are in the volume respectively and are 11L, 12L, 13L, 14L, 15L department.
Sample injection: an oil inlet valve 9, a liquid inlet protection valve 10 and a gas regulating valve 11 are automatically opened, a dissolved gas Changqing crude oil sample of 40L and 1MPa is injected into the oil-gas-water three-phase separation column 2 by using the constant-pressure constant-speed pump 1, the oil inlet valve 9 and the liquid inlet protection valve 10 are automatically closed, and temperature and pressure parameters in the oil-gas-water three-phase separation column 2 are measured by using the temperature/pressure sensor A7;
gas-liquid separation: utilize electric stirrer 5 passes through stirring impeller 6 stirs with 20 r/min's stirring rate and accelerates gas-liquid separation to the sample, will 3 volumes of piston gas holder are adjusted to maximum volume 20L in order to reduce pressure in the oil gas water three-phase separation post 2 to collect the gas that spills over, 11 self-closing of gas control valve, utilize temperature/pressure sensor second 8 measures temperature, pressure parameter in the piston gas holder 3, relief valve 12 is automatic to be opened, will 3 volumes of piston gas holder are adjusted to minimum volume in order to exhaust gas, and 12 self-closing of relief valve, 11 self-openings of gas control valve, repeat this process, until 2 internal pressure drop to atmospheric pressure of oil gas water three-phase separation post. The total volume of the exhaust gas calculated by a computer is as follows: 205L +179L +146L +137L +113L +96L +74L +52L +33L +17L-431L 621L.
Oil-water separation: the electric stirrer 5 is used for stirring the sample at a stirring speed of 20r/min through the stirring impeller 6 to accelerate oil-water separation, the multipoint conductivity tester 4 is used for testing the change curve of the conductivity at different measurement points along with the time as shown in figure 2, the conductivity values of the first point, the second point and the third point are increased, the maximum volume of the mapping is 13L, the total amount of the injected sample is 40L, and the water content of the sample is calculated to be about 32.5%.
Emptying the separation column: after the test is finished, the liquid discharge valve 13 is automatically opened, the piston type gas storage tank 3 is utilized to pressurize the oil-gas-water three-phase separation column 2, the liquid sample after oil-water separation is discharged, the piston type gas storage tank 3 is reset (0L), and the gas regulating valve 11 and the liquid discharge valve 13 are automatically closed.
The invention has the advantages of simple structure, small test loss, high automation degree of the test process, great reduction of the workload of personnel and realization of the integrated online measurement requirement of the oil-gas-water three-phase content in the oil pipeline with pressure.
Claims (5)
1. Oil-gas-water three-phase content integrated online measuring device in oil pipeline and use method thereof, comprising constant pressure constant speed pump (1), oil-gas-water three-phase separation column (2), piston type gas storage tank (3), multi-point position conductivity measuring instrument (4), electric stirrer (5), stirring impeller (6), temperature/pressure sensor (7) (8) and corresponding automatic valve and pipeline, characterized in that, constant pressure constant speed pump (1) is connected with oil pipeline and oil-gas-water three-phase separation column (2), stirring impeller (6) is in oil-gas-water three-phase separation column (2) and is connected with electric stirrer (5), multi-point position conductivity measuring instrument (4) and temperature/pressure sensor (7) measuring point position is in oil-gas-water three-phase separation column (2), piston type gas storage tank (3) is connected with oil-water separation column (2), and the temperature/pressure sensor (8) is connected with an oil pipeline, and the measuring point position of the temperature/pressure sensor is positioned in the piston type air storage tank (3).
2. The device according to claim 1, characterized in that the oil-gas-water three-phase separation column (2) adopts a vertical structure, has a volume of not less than 50 liters and a length-diameter ratio of 5:1 to 10: 1.
3. The device according to claim 1, characterized in that the stirring impeller (6) is "Y" or "U" shaped, with a stirring speed of less than 50 revolutions per minute.
4. The device according to claim 1, characterized in that the multipoint conductivity meter (4) has 5 to 10 measuring points which are longitudinally distributed between the heights 1/10 to 7/10 of the oil-gas-water three-phase separation column (2).
5. An on-line measuring method for oil, gas and water three-phase content in an oil pipeline, which adopts the integrated on-line measuring device for oil, gas and water three-phase content in an oil pipeline according to any one of claims 1 to 4, and is characterized by comprising the following steps:
s1, sample injection: controlling the sample injection flow by using the constant-pressure constant-speed pump (1), taking a sample from an oil pipeline, injecting the sample into the oil-gas-water three-phase separation column (2), stopping the constant-pressure constant-speed pump (1) after reaching a preset volume, and measuring temperature and pressure data in the oil-gas-water three-phase separation column (2) by using the temperature/pressure sensor (7);
s2, gas-liquid separation: the electric stirrer (5) is used for stirring the sample at a low speed through the stirring impeller (6) to accelerate gas-liquid separation, the piston type gas storage tank (3) is used for reducing the pressure in the oil-gas-water three-phase separation column (2), and collecting the overflowed gas, measuring the temperature and pressure data in the piston type gas storage tank (3) by using the temperature/pressure sensor (8), discharging the collected gas, and the process is repeated until the pressure in the oil-gas-water three-phase separation column (2) is reduced to the atmospheric pressure, calculating the volume of the gas separated in one time, namely the volume of the gas separated in one time, which is changed by the gas storage tank, is multiplied by (gas storage tank pressure/normal pressure) multiplied by (normal temperature/gas storage tank temperature)/compression factor, wherein the total volume of the gas is multiplied by the volume of the gas separated in the previous time, and multiplied by (separation column pressure/normal pressure) multiplied by (normal temperature/separation column temperature)/compression factor;
s3, oil-water layering: stirring the sample at a low speed by using the electric stirrer (5) through the stirring impeller (6) to accelerate oil-water stratification, measuring the conductivity parameter change at different positions in the oil-gas-water three-phase separation column (2) by using the multipoint conductivity measuring instrument (5), and calculating the free water content in the oil pipeline, namely the highest point position height increased by the conductivity multiplied by the cross section area of the separation column/the total volume of the liquid in the separation column multiplied by 100% by combining the size of the oil-gas-water three-phase separation column (2);
s4, emptying the separation column: after the test is finished, the piston type gas storage tank (3) is utilized to pressurize the oil-gas-water three-phase separation column (2), and the tested sample is reinjected into an oil pipeline or is discharged.
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Cited By (1)
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