CN115218994A - Natural gas flowmeter testing device and method - Google Patents
Natural gas flowmeter testing device and method Download PDFInfo
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- CN115218994A CN115218994A CN202110430033.XA CN202110430033A CN115218994A CN 115218994 A CN115218994 A CN 115218994A CN 202110430033 A CN202110430033 A CN 202110430033A CN 115218994 A CN115218994 A CN 115218994A
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 114
- 239000003345 natural gas Substances 0.000 title claims abstract description 58
- 238000012360 testing method Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000007789 gas Substances 0.000 claims abstract description 49
- 238000003860 storage Methods 0.000 claims abstract description 45
- 239000012530 fluid Substances 0.000 claims description 49
- 230000002457 bidirectional effect Effects 0.000 claims description 8
- 238000004891 communication Methods 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 238000005259 measurement Methods 0.000 abstract description 8
- 238000013461 design Methods 0.000 description 15
- 230000008569 process Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 6
- 238000010079 rubber tapping Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
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- 238000009533 lab test Methods 0.000 description 1
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Abstract
The application provides a natural gas flowmeter testing device and a method, and belongs to the technical field of natural gas flow metering. The technical scheme that this application embodiment provided, through using the reference flowmeter that the outflow coefficient can remain unchangeable under different pressure, the degree of accuracy of the flowmeter under test, utilized reference flowmeter under high pressure, the unaffected characteristics of its degree of accuracy, both guaranteed the degree of accuracy of reference flowmeter under high pressure, it is under high pressure condition to ensure to be in again when being surveyed the flowmeter to test, thereby the degree of accuracy that records through the device is the actual degree of accuracy of this being surveyed the flowmeter under high pressure condition, higher referential nature has, be applicable to with this being surveyed the flowmeter and use in the flow measurement when the gas storage wellhead.
Description
Technical Field
The application relates to the technical field of natural gas flow metering, in particular to a natural gas flowmeter testing device and method.
Background
In the operation process of the natural gas storage, the injection and production gas metering is an important process link, accurate metering can effectively guide production, operation parameters are optimized, the injection and production effects are scientifically evaluated, and the natural gas injection and production rate is improved. During the metering process, the accuracy of the flowmeter plays a critical role in the metering result, and therefore, it is necessary to test the accuracy of the flowmeter, wherein the accuracy test content comprises indicating error and repeatability.
However, the conventional natural gas flowmeter testing device usually performs dry calibration under the conditions that the calibration pressure is within 10MPa and gas is static and does not flow, by accurately measuring various parameters in a flow equation, the accuracy of the flowmeter is only for fluid with the pressure within 10MPa, when the flowmeter is applied to a wellhead of a gas storage reservoir, since the natural gas pressure at the wellhead of the gas storage reservoir may reach 16MPa-42MPa, under the condition of high-pressure natural gas flow, a flowmeter probe signal, the size deformation of a flowmeter body and the like can slightly change, which can cause the measurement accuracy of an on-site flowmeter to change, so that the accuracy of the natural gas flowmeter testing device under the original testing condition is not suitable for the high-pressure condition at the wellhead of the gas storage reservoir.
Disclosure of Invention
The embodiment of the application provides a natural gas flowmeter testing device and method, the accuracy measured by the device is the actual accuracy of the measured flowmeter under a high-pressure condition, the device has high referential performance, and the device is suitable for flow measurement when the measured flowmeter is applied to a wellhead of a gas storage. The technical scheme is as follows:
in one aspect, a natural gas flowmeter testing device is provided, the device comprising: a first branch and a second branch;
the first branch circuit and the second branch circuit are connected in parallel;
the first end of the first branch is communicated with the first end of the second branch, a first communication position is formed and used for being connected with a booster set or a natural gas pipeline network, and the booster set can provide preset pressure for the first branch;
the second end of the first branch is communicated with the second end of the second branch, a second communication position is formed and used for connecting a gas storage well head, and the gas storage well head can provide preset pressure for the first branch;
the first branch includes: the first end of the first branch is communicated with the second end through a pipeline in sequence: the flow meter comprises a first valve group, a reference flow meter, a measured flow meter and a second valve group;
the second branch comprises: the gas storage bidirectional flowmeter is respectively communicated with the first end and the second end of the second branch through pipelines;
the discharge coefficient of the reference flowmeter remains constant at different pressures, the reference flowmeter comprising: the flow resisting piece is in a spindle shape;
a flow passage is arranged between the first port and the second port of the meter body, the flow resisting piece is positioned in the flow passage, a first pressure taking port is arranged on the side wall corresponding to the first port, and a second pressure taking port is arranged on the side wall corresponding to the middle position of the flow passage.
In one possible design, the preset pressure is: 16MPa-42MPa.
In one possible design, the first valve block includes: at least two stages of valves in series for regulating the flow of fluid in the first branch.
In one possible design, the second valve bank includes: at least two stages of valves in series for regulating the flow of fluid in the first branch.
In one possible design, the reference flow meter further includes: at least two groups of supporting pieces, wherein each end of the flow resisting piece is fixed on the inner wall of the watch body through one group of supporting pieces.
In one possible design, the watch body is also provided with a temperature measuring port.
In one possible design, the booster set includes a compressor.
In one aspect, there is provided a natural gas flowmeter testing method applied to a natural gas flowmeter testing device as provided in any one of the above possible designs, the method including:
installing the measured flow meter between the reference flow meter and the second valve group;
opening the first valve block and the second valve block;
adjusting the first valve bank and the second valve bank to enable the fluid pressure in the first branch to be preset pressure;
acquiring first flow data of a reference flowmeter and second flow data of a measured flowmeter corresponding to the same moment for multiple times;
and acquiring the flow indicating value error and repeatability of the measured flowmeter relative to the reference flowmeter based on the first flow data, the second flow data and the outflow coefficient of the reference flowmeter.
In one possible implementation, the preset pressure is: 16MPa-42MPa.
In one possible implementation, the adjusting the first and second valve sets to provide the fluid in the first branch with a predetermined pressure includes:
when fluid flows from the first end to the second end of the first branch, the booster set, the first valve group and the second valve group are adjusted to enable the fluid in the first branch to have preset pressure;
when the fluid flows along the direction from the second end to the first end of the first branch, the first valve group and the second valve group are adjusted to enable the fluid in the first branch to have a preset pressure.
The technical scheme that this application embodiment provided, through using the reference flowmeter that outflow coefficient can keep unchangeable under different pressure, the degree of accuracy of the flowmeter under test is surveyed, utilized the reference flowmeter under high pressure, the unaffected characteristics of its degree of accuracy, both guaranteed the degree of accuracy of reference flowmeter under high pressure, it is under high pressure to ensure to be in again when being surveyed the flowmeter to be tested, thereby the degree of accuracy that records through the device is this to be surveyed the actual degree of accuracy of flowmeter under high pressure, higher referential nature has, be applicable to and use this to be surveyed the flowmeter in the flow measurement when the gas storage wellhead.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a natural gas flowmeter testing device provided in an embodiment of the present application;
fig. 2 is a schematic structural diagram of a reference flowmeter 12 according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of an application of a natural gas flowmeter testing device provided by an embodiment of the present application;
fig. 4 is a schematic structural diagram of an application of another natural gas flowmeter testing device provided in an embodiment of the present application;
FIG. 5 is a flow chart of a method for testing a natural gas flowmeter provided by an embodiment of the present application;
fig. 6 is a flow chart of a method for testing a natural gas flowmeter according to an embodiment of the present application.
The reference numerals for the various parts in the drawings are illustrated below:
1-a first branch;
11-a first valve group;
12-a reference flow meter;
121-watch body;
1211-a first pressure taking port;
1212-a second pressure tapping;
122-a flow blocker;
123-a first port;
124-a second port;
125-support sheet;
126-temperature measuring port;
13-a measured flow meter;
14-a second valve group;
2-a second branch;
21-a gas storage bidirectional flowmeter;
3-a booster set;
4-natural gas pipe network;
5-gas storage wellhead.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral connections; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In the operation process of the natural gas storage, the gas storage bidirectional flowmeter 21 is installed on the gas storage wellhead 5, so that the natural gas can flow into the gas storage through the gas storage bidirectional flowmeter 21 and can flow out of the gas storage, and then continuously flows out through the gas storage wellhead 5 bidirectional flowmeter. Due to the accumulation of large amounts of natural gas in the reservoir, the fluid in the pipeline at the reservoir wellhead 5 has a high pressure, which may be 16-42 MPa at some reservoir wellheads 5.
This application is based on the original structure of gas storage storehouse import, a natural gas flowmeter testing arrangement is provided, can utilize original condition to test like this, save the expense of building equipment, can provide the condition completely unanimous with gas storage storehouse well head 5 for the test by flow meter 13 again, including pressure condition and the stability that the natural gas flows etc, thereby the process that makes the test can simulate the actual service environment by flow meter 13 completely, the test result that makes, match completely with the service environment by flow meter 13.
Fig. 1 is a schematic structural diagram of a natural gas flowmeter testing apparatus provided in an embodiment of the present application, please refer to fig. 1, where the apparatus includes: a first branch 1 and a second branch 2; the first branch 1 and the second branch 2 are connected in parallel; the first end of the first branch 1 is communicated with the first end of the second branch 2, a first communication position is formed and is used for connecting a booster set 3 or a natural gas pipe network 4, and the booster set 3 can provide preset pressure for the first branch 1; the second end of the first branch 1 is communicated with the second end of the second branch 2, a second communication position is formed and used for being connected with a gas storage wellhead 5, and the gas storage wellhead 5 can provide preset pressure for the first branch 1; the first branch 1 comprises: the first end of the first branch 1 is communicated with the second end through pipelines in sequence: a first valve group 11, a reference flowmeter 12, a measured flowmeter 13 and a second valve group 14; the second branch 2 comprises: a gas storage bidirectional flow meter 21 respectively communicated with the first end and the second end of the second branch 2 through pipelines; the flow coefficient of the reference flow meter 12 remains constant at different pressures, the reference flow meter 12 comprising: a watch body 121 and a choke 122, the choke 122 being spindle-shaped; a flow channel is disposed between the first port 123 and the second port 124 of the watch body 121, the choke 122 is located in the flow channel, a first pressure-taking port 1211 is disposed on a side wall corresponding to the first port 123, and a second pressure-taking port 1212 is disposed on a side wall corresponding to a middle position of the flow channel.
The working principle of the device is described in detail below:
the reference flowmeter 12 is a differential pressure flowmeter, and the working principle thereof is as follows: the pressure is measured based on the fluid continuity equation and the bernoulli equation, and has a characteristic that the outflow coefficient is constant at different pressures, so that the reference flowmeter 12 can accurately measure the flow rate of the fluid and is suitable for testing the measured flowmeter 13. The structure and operation of the reference flowmeter 12 is described below:
fig. 2 is a schematic structural diagram of a reference flowmeter 12 according to an embodiment of the present application, please refer to fig. 2, for the reference flowmeter 12, a first pressure tapping 1211 is connected to a first pressure gauge, a second pressure tapping 1212 is connected to a second pressure gauge, and a choke member 122, which is coaxial with an axis and has a shape of a spindle, having a diameter smaller than an inner diameter of a flow channel, is embedded in a meter body 121, so that when a fluid passes through an annular channel formed between the choke member 122 and an inner wall of the meter body 121, two side boundary layers of the fluid are forced to start building again, and a flow state of the fluid in the annular channel is close to a uniform velocity distribution. Since the reference flowmeter 12 is a bidirectional flowmeter, the fluid can flow in both directions in the flow channel, taking the process of flowing the fluid along the first port 123 toward the second port 124 as an example, at the stage of flowing the fluid from the first port 123 toward the middle of the meter body 121, the flow velocity of the fluid is increased, the pressure is reduced, so that a stable differential pressure is formed between the first port 123 and the middle of the meter body 121, and the flow rate can be calculated according to the functional relationship between the differential pressure and the flow rate.
The flow rate may be obtained based on the following relation 1 or relation 2:
in the formula, q m Is the mass flow rate;
re is Reynolds number;
d is the diameter of the flowmeter;
d is the equivalent inner diameter of the flowmeter;
β is the ratio of D to D;
ma is Mach number;
ρ 1 is the gas density;
Δ p is differential pressure;
in the formula: q. q.s m Is the mass flow rate;
d is the diameter of the flowmeter;
d is the equivalent inner diameter of the flowmeter;
ρ 1 is the gas density;
Δ p is differential pressure;
c is the flow coefficient of the flowmeter;
ε represents the coefficient of expansion.
By adopting the spindle-shaped fluid set, the reference flowmeter 12 has the self-rectifying effect, and the same motion similarity can be ensured under the laboratory condition and the field high-pressure condition.
In the structure, the first communication part is used for connecting the booster set 3 or the natural gas pipe network 4, and the booster set 3 and the natural gas pipe network 4 correspond to two different using modes of the device.
Fig. 3 is a schematic view of an application structure of a natural gas flowmeter testing device provided in an embodiment of the present application, please refer to fig. 3, when a first connection is connected to a booster set 3, high-pressure natural gas is introduced into a gas storage through the booster set 3 along a first branch 1.
Fig. 4 is a schematic view of an application structure of another natural gas flowmeter testing device according to an embodiment of the present application, please refer to fig. 4, where a natural gas pipe network 4 is connected to a first connection point, and natural gas is delivered to the natural gas pipe network 4 along a first branch 1 based on the pressure of gas in a gas storage.
In this embodiment, the use mode of introducing high-pressure natural gas into the gas storage by the booster unit 3 may be referred to as forward use, and the use mode of transporting natural gas to the natural gas pipe network 4 by the gas storage may be referred to as reverse use. By using the forward direction and the reverse direction, the tested flowmeter 13 is tested in the forward direction and the reverse direction, so that the real use state of the flowmeter is simulated, and the accuracy of the flowmeter is accurately tested.
In the forward use process, the use steps can be as follows:
step 1: the first end of the first branch 1 is connected with a booster set 3, and the second end is connected with a gas storage wellhead 5.
Step 2: a measured flow meter 13 is installed between the reference flow meter 12 and the second valve group 14.
And step 3: the first valve group 11 and the second valve group 14 are opened.
And 4, step 4: when the fluid flows in a direction from the first end to the second end of the first branch 1, the booster set 3, the first valve set 11 and the second valve set 14 are adjusted to make the fluid in the first branch 1 have a predetermined pressure.
And 5: the first flow rate data of the reference flowmeter 12 and the second flow rate data of the measured flowmeter 13 corresponding to the same time are acquired a plurality of times.
Step 6: and acquiring the flow indicating value error and repeatability of the measured flowmeter 13 relative to the reference flowmeter 12 based on the first flow data, the second flow data and the outflow coefficient of the reference flowmeter 12.
In the reverse use process, the use steps can be as follows:
step 1: the first end of the first branch 1 is connected with a natural gas pipe network 4, and the second end of the first branch is connected with a gas storage wellhead 5.
Step 2: a measured flow meter 13 is installed between the reference flow meter 12 and the second valve group 14.
And step 3: the first valve group 11 and the second valve group 14 are opened.
And 4, step 4: when fluid flows in a direction from the second end to the first end of the first branch 1, the first valve set 11 and the second valve set 14 are adjusted such that the fluid in the first branch 1 has a predetermined pressure.
And 5: the first flow rate data of the reference flowmeter 12 and the second flow rate data of the measured flowmeter 13 corresponding to the same time are acquired a plurality of times.
Step 6: and acquiring the flow indicating value error and repeatability of the measured flowmeter 13 relative to the reference flowmeter 12 based on the first flow data, the second flow data and the outflow coefficient of the reference flowmeter 12.
The device that this application embodiment provided, through using the reference flowmeter 12 that the outflow coefficient can remain unchangeable under different pressure, test by the accuracy of flow meter 13, utilized reference flowmeter 12 under the high-pressure condition, characteristics that its degree of accuracy is not influenced, both guaranteed reference flowmeter 12 under the high-pressure condition the degree of accuracy, it is under the high-pressure condition to ensure to be in again by flow meter 13 when testing, thereby the degree of accuracy that surveys through the device is the actual degree of accuracy of this by flow meter 13 under the high-pressure condition, have higher referential nature, be applicable to in the flow measurement when using this by flow meter 13 at gas storage wellhead 5.
The following details the structure and the working principle of each part of the device:
for the reference flowmeter 12, in addition to the first pressure gauge and the second pressure gauge, the pressure transmitter and the flow integrator are connected for automatically calculating the flow, and the spindle-shaped flow blocking member 122 can avoid flow separation and vortex generation, so that the resistance to the fluid is minimized. The flow resisting element 122 has a constant diameter section at a suitable position in the middle thereof to form a uniform annular channel with the inner wall of the measuring tube.
At the chokes 122, the flow area of the measuring tube becomes smaller. The ground fluid with large cross section area in the pipeline has low flow speed and high pressure, and the ground fluid with small cross section area has high flow speed and low pressure. In other words, the high pressure tube has a large flow area and a high pressure, and the low pressure tube has a small flow area and a low pressure. In addition, the fluid has viscosity, and the total pressure of the fluid is reduced along the flow direction due to the friction with the wall surface. The two functions generate a differential pressure between the high-pressure hole and the low-pressure hole, and the differential pressure has a certain corresponding relation with the flow. Thus, by measuring the differential pressure, the flow rate can be calculated. The measurement accuracy of reference flowmeter 12 is limited to a large extent only by the accuracy of the differential pressure transmitter and the flow totalizer.
Because the reference flowmeter 12 calibrates the similarity between the flow field and the application flow field, the outflow coefficient has the characteristic of being relatively unchanged when the reynolds number is more than 105 under the laboratory condition and the high-pressure condition of the reference flowmeter 12, and the high-pressure and low-pressure metering errors are close to each other. The outflow coefficients are 0.9051 and 0.9052 respectively obtained by fitting by a coefficient detection method.
The flow rate is more than 32m according to experimental data of high-pressure, low-pressure and factory test conditions 3 And h, actually testing that the flow indication value of the reference flowmeter 12 deviates about-0.43 percent relative to the reference flow under the condition that the pressure of the wellhead 5 of the gas storage is 22 MPa-25 MPa by the reference flowmeter 12. And calculating parameters under the field working condition by using the laboratory outflow coefficient to obtain the error of the calculated flow indicating value. The flow indicating value error is calculated by using the laboratory low-pressure outflow coefficient, the relative deviation is very close to the actual measured flow, and the whole average relative deviation is only different by-0.03 percent. Thus, the ginsengThe test data of the reference flowmeter 12 in the gas injection stage show that the relative deviation of the reference flowmeter 12 is consistent with the laboratory test data, and the outflow coefficient of the reference flowmeter 12 has the characteristic of being relatively unchanged under the conditions of low pressure less than 10MPa and high pressure higher than 20MPa and when the Reynolds number is more than 105.
In one possible design, the preset pressure is: 16MPa-42MPa, which is consistent with the pressure of the wellhead 5 of the gas storage reservoir during the use process, thereby enabling the device to simulate the real working conditions of the measured flowmeter 13.
In a possible design, the first valve group 11 comprises: at least two stages of valves in series for regulating the flow of fluid in the first branch 1. The at least two groups of valves are used for playing a control role, the flow of the fluid in the first branch circuit 1 is adjusted by adjusting the opening degree of the two-stage valves, and the pressure of the fluid in the first branch circuit 1 is adjusted to be preset pressure by the change of the flow.
In one possible design, the second valve block 14 includes: at least two stages of valves in series for regulating the flow of fluid in the first branch 1. The at least two groups of valves are used for playing a control role, the flow of the fluid in the first branch circuit 1 is adjusted by adjusting the opening degree of the two-stage valves, and the pressure of the fluid in the first branch circuit 1 is adjusted to be preset pressure by the change of the flow.
In one possible design, the reference flow meter 12 further includes: at least two sets of support pieces 125, each end of the choke 122 is fixed on the inner wall of the watch body 121 through one set of support pieces 125. Each support piece 125 may be at least 3 pieces and evenly distributed so that the spoilers 122 may be fixed at different angles of the circumference, for example, 4 pieces with a 90 degree angle between each piece. The shape and the inclination angle of the supporting sheet 125 may be set according to actual needs, which is not limited in this embodiment.
In one possible design, the meter body 121 is further provided with a temperature measuring port 126 for measuring the temperature of the fluid, so as to obtain more accurate flow information.
In one possible design, the booster group 3 comprises a compressor by which the fluid is pressurized so that it can quickly reach a preset pressure.
All the above optional technical solutions may be combined arbitrarily to form optional embodiments of the present application, and are not described herein again.
The device that this application embodiment provided, through using the reference flowmeter 12 that outflow coefficient can remain unchanged under different pressure, the degree of accuracy of flow meter 13 is surveyed, reference flowmeter 12 has been utilized under the high pressure condition, the characteristics that its degree of accuracy is not influenced, reference flowmeter 12 has both been guaranteed to the degree of accuracy under the high pressure condition, it is under the high pressure condition to ensure to be in again when being surveyed flow meter 13 and testing, thereby the degree of accuracy that measures through the device is the actual degree of accuracy of this being surveyed flow meter 13 under the high pressure condition, have higher referential, be applicable to in the flow measurement when using this being surveyed flow meter 13 in gas storage wellhead 5.
In this embodiment, the use mode of introducing high-pressure natural gas into the gas storage by the booster unit 3 may be referred to as forward use, and the use mode of transporting natural gas to the natural gas pipe network 4 by the gas storage may be referred to as reverse use. By using the forward direction and the reverse direction, the tested flowmeter 13 is tested in the forward direction and the reverse direction, so that the real use state of the flowmeter is simulated, and the accuracy of the flowmeter is accurately tested. The two cases of use are described below separately.
Fig. 5 is a flow chart of a natural gas flowmeter testing method provided by an embodiment of the present application, please refer to fig. 5, the method is applied to a natural gas flowmeter testing apparatus provided in any one of the above possible designs, and the method includes:
in the forward use process, the use steps can be as follows:
501: the first end of the first branch 1 is connected with a booster set 3, and the second end is connected with a gas storage wellhead 5.
In this step, the first end is communicated with the booster set 3, so that high-pressure natural gas can be conveniently introduced into the gas storage through the booster set 3.
502: a measured flow meter 13 is installed between the reference flow meter 12 and the second valve group 14.
In this step, the measured flowmeter 13 and the reference flowmeter 12 are adjacent to each other, thereby ensuring that the respective flow rates are identical.
503: the first valve group 11 and the second valve group 14 are opened.
This step is used to start tapping.
504: when the fluid flows in a direction from the first end to the second end of the first branch 1, the booster set 3, the first valve set 11 and the second valve set 14 are adjusted to make the fluid in the first branch 1 have a predetermined pressure.
In one possible implementation, the preset pressure is: 16MPa-42MPa.
505: the first flow rate data of the reference flowmeter 12 and the second flow rate data of the measured flowmeter 13 corresponding to the same time are acquired a plurality of times.
The first flow data may be calculated according to a function corresponding to the reference flowmeter 12, the second flow data may be calculated according to a function corresponding to the measured flowmeter 13, or may be read through a display corresponding to the measured flowmeter 13, which is not limited in this embodiment.
506: and acquiring the flow indicating value error and repeatability of the measured flowmeter 13 relative to the reference flowmeter 12 based on the first flow data, the second flow data and the outflow coefficient of the reference flowmeter 12.
The flow indication error of the relative reference flowmeter 12 refers to the error of the data after a plurality of tests, and the repeatability refers to the degree of data repetition after a plurality of tests.
In this step, the indication error of the measured flowmeter 13 can also be detected as a reference for the accuracy test.
The method provided by the embodiment of the application tests the accuracy of the measured flowmeter 13 by using the reference flowmeter 12 with the outflow coefficient kept unchanged under different pressures, utilizes the characteristic that the accuracy of the reference flowmeter 12 is not influenced under a high-pressure condition, not only ensures the accuracy of the reference flowmeter 12 under the high-pressure condition, but also ensures that the measured flowmeter 13 is under the high-pressure condition when tested, so that the accuracy measured by the device is the actual accuracy of the measured flowmeter 13 under the high-pressure condition, has higher reference, and is suitable for flow metering when the measured flowmeter 13 is applied to a gas storage wellhead 5.
Fig. 6 is a flow chart of a natural gas flowmeter testing method provided by an embodiment of the present application, please refer to fig. 6, the method is applied to a natural gas flowmeter testing apparatus provided in any one of the above possible designs, and the method includes:
in the reverse use process, the use steps can be as follows:
601: the first end of the first branch 1 is connected with a natural gas pipe network 4, and the second end of the first branch is connected with a gas storage wellhead 5.
In the step, the first end is communicated with a natural gas pipe network 4, so that high-pressure natural gas can be conveniently introduced into the natural gas pipe network 4 through a gas storage wellhead 5.
602: a measured flow meter 13 is installed between the reference flow meter 12 and the second valve group 14.
In this step, the measured flowmeter 13 and the reference flowmeter 12 are adjacent to each other, thereby ensuring that the respective flow rates are identical.
603: the first valve group 11 and the second valve group 14 are opened.
This step is used to start tapping.
604: when fluid flows in a direction from the second end to the first end of the first branch 1, the first valve set 11 and the second valve set 14 are adjusted such that the fluid in the first branch 1 has a predetermined pressure.
In one possible implementation, the preset pressure is: 16MPa-42MPa.
605: the first flow rate data of the reference flowmeter 12 and the second flow rate data of the measured flowmeter 13 corresponding to the same time are acquired a plurality of times.
The first flow data may be calculated according to a function corresponding to the reference flowmeter 12, the second flow data may be calculated according to a function corresponding to the measured flowmeter 13, or may be read through a display corresponding to the measured flowmeter 13, which is not limited in this embodiment.
606: and acquiring the flow indicating value error and repeatability of the measured flowmeter 13 relative to the reference flowmeter 12 based on the first flow data, the second flow data and the outflow coefficient of the reference flowmeter 12.
The flow indication error of the relative reference flowmeter 12 refers to the error of the data after a plurality of tests, and the repeatability refers to the repetition degree of the data after a plurality of tests.
The method provided by the embodiment of the application tests the accuracy of the measured flowmeter 13 by using the reference flowmeter 12 with the outflow coefficient kept unchanged under different pressures, utilizes the characteristic that the accuracy of the reference flowmeter 12 is not influenced under a high-pressure condition, not only ensures the accuracy of the reference flowmeter 12 under the high-pressure condition, but also ensures that the measured flowmeter 13 is under the high-pressure condition when tested, so that the accuracy measured by the device is the actual accuracy of the measured flowmeter 13 under the high-pressure condition, has higher reference, and is suitable for flow measurement when the measured flowmeter 13 is applied to the wellhead 5 of the gas storage.
The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A natural gas flow meter testing apparatus, the apparatus comprising: a first branch (1) and a second branch (2);
the first branch (1) and the second branch (2) are connected in parallel;
the first end of the first branch (1) is communicated with the first end of the second branch (2), a formed first communication position is used for connecting a booster set (3) or a natural gas pipe network (4), and the booster set (3) can provide preset pressure for the first branch (1);
the second end of the first branch (1) is communicated with the second end of the second branch (2), a second communication position is formed and is used for being connected with a gas storage wellhead (5), and the gas storage wellhead (5) can provide preset pressure for the first branch (1);
the first branch (1) comprises: the first end of the first branch (1) is communicated with the second end in sequence through pipelines: a first valve group (11), a reference flowmeter (12), a measured flowmeter (13) and a second valve group (14);
the second branch (2) comprises: the gas storage bidirectional flow meter (21) is respectively communicated with the first end and the second end of the second branch (2) through pipelines;
the reference flow meter (12) having a flow coefficient that remains constant at different pressures, the reference flow meter (12) comprising: the meter comprises a meter body (121) and a choke piece (122), wherein the choke piece (122) is in a spindle shape;
be equipped with the circulation passageway between first port (123) and the second port (124) of table body (121), choke spare (122) are located in the circulation passageway, be equipped with first pressure port (1211) on the lateral wall that first port (123) correspond, be equipped with second pressure port (1212) on the lateral wall that the intermediate position of circulation passageway corresponds.
2. The apparatus of claim 1, wherein the preset pressure is: 16MPa-42MPa.
3. The device according to claim 1, characterized in that said first valve group (11) comprises: at least two stages of valves in series for regulating the flow of fluid in the first branch (1).
4. The device according to claim 1, characterized in that said second valve group (14) comprises: at least two stages of valves in series for regulating the flow of fluid in the first branch (1).
5. The apparatus of claim 1, wherein the reference flow meter (12) further comprises: at least two sets of support pieces (125), wherein each end of the flow resisting piece (122) is fixed on the inner wall of the watch body (121) through one set of support pieces (125).
6. The device according to claim 5, characterized in that the watch body (121) is also provided with a temperature measuring port (126).
7. The arrangement according to claim 1, characterized in that the booster group (3) comprises a compressor.
8. A natural gas flow meter testing method applied to a natural gas flow meter testing apparatus according to any one of claims 1 to 7, the method comprising:
installing a measured flow meter (13) between the reference flow meter (12) and the second valve group (14);
-opening a first group of valves (11) and a second group of valves (14);
-adjusting said first and second valve groups (11, 14) to a preset pressure of the fluid in the first branch (1);
acquiring first flow data of a reference flowmeter (12) and second flow data of a measured flowmeter (13) corresponding to the same moment for multiple times;
and acquiring the flow indicating error and repeatability of the measured flowmeter (13) relative to the reference flowmeter (12) based on the first flow data, the second flow data and the outflow coefficient of the reference flowmeter (12).
9. The method of claim 8, wherein the preset pressure is: 16MPa-42MPa.
10. Method according to claim 8, wherein said adjusting said first and second valve groups (11, 14) to a preset pressure of the fluid in the first branch (1) comprises:
when the fluid flows from the first end to the second end of the first branch (1), the booster set (3), the first valve set (11) and the second valve set (14) are adjusted to enable the fluid in the first branch (1) to have a preset pressure;
when fluid flows in a direction from the second end to the first end of the first branch (1), the first valve set (11) and the second valve set (14) are adjusted to make the fluid in the first branch (1) have a preset pressure.
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