Small-gas-volume disc-type orifice plate flow metering system

Abstract

The utility model provides a small gas flow disc type orifice plate flow metering system, the metering system comprises a flowmeter, an electric back pressure control system and a data acquisition system, the flowmeter is arranged on an upstream pipeline of the data acquisition system, the flowmeter comprises a plurality of standard orifice plates with different sizes and a rotating mechanism, and the rotating mechanism is arranged on the upstream pipeline of the data acquisition system. The standard pore plates are integrated on the rotating mechanism, the standard pore plates with different sizes are rotated to preset positions, and the standard pore plates with different sizes are replaced; the data acquisition system comprises a wireless pressure transmitter, a wireless temperature transmitter, a pipe nozzle and a temperature sheath, and the wireless pressure transmitter is connected with the pipe nozzle; the wireless temperature transmitter is connected with the temperature sheath; the electric back pressure control system comprises an electric back pressure control valve and a power supply control system, the electric back pressure control valve is connected with the power supply control system, and the electric back pressure control valve is arranged on a downstream pipeline of the data acquisition system. According to the utility model, the replacement of the pore plate can be easily realized, and the test continuity is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil and gas well oil and gas field development ground measurement technical field, specifically, relate to a small gas quantity disc type orifice flow metering system. BACKGROUND

[0002] The critical velocity flowmeter is generally used for measuring in the low-yield gas well measurement operation in Changqing oilfield region, the flowmeter measures the upflow pressure, upflow temperature, downflow pressure and downflow temperature parameters before and after the orifice plate, and combines the principle of critical flow to calculate the gas production, and is mainly suitable for the gas well with the gas production being greater than 8000m 3 / d. However, the critical velocity flowmeter needs to remove the gas testing flow pipeline or dismount the orifice plate pressure cap to replace the orifice plate, which is not only time-consuming and laborious, but also has safety hazards. In addition, the method also has the problems of not being able to record test data in real time, being easily affected by human factors to cause large measurement result error, and being unable to accurately measure the daily gas production of 8000m 3 / d. For the low-yield gas well gas production measurement process, it is urgent to design a simple, accurate, efficient and quick measurement tool to realize the purposes of recording test data in real time, automatically controlling back pressure and online replacing the orifice plate.

[0003] The utility model discloses a rotatable replaceable orifice valve, including a valve body, a rotatable multi-orifice plate in the valve body, a small shaft, a positioning pin and a sealing ring, a bushing, a spring piece and a pressure ring installed in the flow channel of the valve body and located on both sides of the multi-orifice plate, the multi-orifice plate is fixedly installed on the small shaft, the small shaft is installed on the valve body and can rotate, the positioning pin is installed on the valve body and can extend into the positioning hole of the multi-orifice plate to position the orifice plate, after positioning, the center of one of the flow holes of the multi-orifice plate should coincide with the center of the flow channel of the valve body, and the sealing ring is pressed on the multi-orifice plate by the spring piece and the bushing through the pressure ring connected with the valve body by screw thread to seal the flow hole from the outside. The problem of online replacing the orifice plate is solved, but the automatic control and real-time data recording are not improved. UTILITY MODEL CONTENTS

[0004] The utility model discloses a rotatable replaceable orifice valve, including a valve body, a rotatable multi-orifice plate in the valve body, a small shaft, a positioning pin and a sealing ring, a bushing, a spring piece and a pressure ring installed in the flow channel of the valve body and located on both sides of the multi-orifice plate, the multi-orifice plate is fixedly installed on the small shaft, the small shaft is installed on the valve body and can rotate, the positioning pin is installed on the valve body and can extend into the positioning hole of the multi-orifice plate to position the orifice plate, after positioning, the center of one of the flow holes of the multi-orifice plate should coincide with the center of the flow channel of the valve body, and the sealing ring is pressed on the multi-orifice plate by the spring piece and the bushing through the pressure ring connected with the valve body by screw thread to seal the flow hole from the outside. The problem of online replacing the orifice plate is solved, but the automatic control and real-time data recording are not improved.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a small gas quantity disc type orifice flow metering system on one aspect, the metering system can include flow meter, electric back pressure control system and data acquisition system, wherein, flow meter is arranged on the upstream pipeline of data acquisition system, flow meter can include several different size standard orifice and rotating mechanism, standard orifice is integrated on rotating mechanism, and rotating different size standard orifice to predetermined position, and replacing different size standard orifice;Data acquisition system can include wireless pressure transmitter, wireless temperature transmitter, nozzle and temperature sheath, wireless pressure transmitter is connected with nozzle, and the pressure data of upstream pipeline is recorded;Wireless temperature transmitter is connected with temperature sheath, and the temperature data of upstream pipeline is recorded;Electric back pressure control system can include electric back pressure control valve and power supply control system, electric back pressure control valve is connected with power supply control system, and electric back pressure control valve is arranged on the downstream pipeline of data acquisition system, and power supply control system can include power supply system and control system, and power supply system is configured to provide voltage to electric back pressure control control system;Control system is configured to control electric back pressure control valve opening stroke.

[0006] According to one or more exemplary embodiments of the utility model on one aspect, the rotating mechanism can include dial, gear shaft and positioning shaft, the standard orifice is integrated on the dial, the dial is provided with gear shaft, and the orifice integrated rotation is driven by rotating gear shaft, and the positioning shaft is provided with scale, and the scale on the dial corresponds.

[0007] According to one or more exemplary embodiments of the utility model on one aspect, the number of standard orifice can include 6-8.

[0008] According to one or more exemplary embodiments of the utility model on one aspect, the data acquisition system can also include data processing system, the data processing system is connected with wireless pressure transmitter and wireless temperature transmitter, receives the pressure data and temperature data of upstream pipeline, and calculates flow.

[0009] According to one or more exemplary embodiments of the utility model on one aspect, the control system type can include PLC control system.

[0010] According to one or more exemplary embodiments of the utility model on one aspect, the power supply system can include solar panel, battery and inverter, the solar panel is connected with battery, the battery is connected with inverter, and the inverter is connected with electric back pressure control valve and control system.

[0011] According to one or more exemplary embodiments of the utility model on one aspect, the metering system can also include rectifier, and the rectifier is arranged on the upstream pipeline of flow meter.

[0012] According to one or more exemplary embodiments of one aspect of the present application, the metering system can further include a flow switching system, which can include a test ball valve, a bypass ball valve and a bypass pipeline, the test ball valve is arranged on the upstream pipeline of the rectifier and connected with the rectifier; one end of the bypass pipeline is connected with the upstream pipeline of the test ball valve, and the other end is connected with the downstream pipeline of the electric back pressure control valve, and the bypass ball valve is arranged on the bypass pipeline.

[0013] According to one or more exemplary embodiments of one aspect of the present application, the valve material of the electric back pressure control valve can include 35CRMO; the valve core, the valve seat and the valve cage of the electric back pressure control valve can include stainless steel.

[0014] According to one or more exemplary embodiments of one aspect of the present application, the metering system as a whole can include a pry structure.

[0015] Compared with the prior art, the present application has the following beneficial effects:

[0016] (1) The metering system provided by the present application can easily realize the replacement of the hole plate, and ensure the continuity of the test;

[0017] (2) The metering system provided by the present application is integrally prised, and is more convenient to transport and carry. BRIEF DESCRIPTION OF DRAWINGS

[0018] The above and other objects and / or characteristics of the present application will become more apparent from the following description with reference to the attached drawings, wherein:

[0019] Figure 1 Fig. 1 shows a structure front view of a metering system of one exemplary embodiment;

[0020] Figure 2 Fig. 2 shows a structure right view of a metering system of one exemplary embodiment;

[0021] Figure 3 Fig. 3 shows a structure top view of a metering system of one exemplary embodiment.

[0022] MAIN REFERENCE NUMERALS EXPLANATION

[0023] 1-test ball valve, 2-rectifier, 3-flow meter, 4-tube nozzle, 5-temperature sheath, 6-wireless pressure transmitter, 7-wireless temperature transmitter, 8-electric back pressure control valve, 9-bypass ball valve, 10-power supply control system. DETAILED DESCRIPTION

[0024] In the following, a small gas volume disc hole plate flow metering system of the present application will be described in detail in conjunction with exemplary embodiments.

[0025] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] First exemplary embodiment

[0027] The present exemplary embodiment provides a small gas quantity disc orifice flow metering system.

[0028] Figure 1 The structure front view of the metering system of an exemplary embodiment is shown; Figure 2 The structure right view of the metering system of an exemplary embodiment is shown; Figure 3 The structure top view of the metering system of an exemplary embodiment is shown. The small gas quantity disc orifice flow metering system of the present exemplary embodiment will be described below in conjunction with Figures 1 to 3 The present exemplary embodiment provides a small gas quantity disc orifice flow metering system.

[0029] In the present exemplary embodiment, as shown in Figure 1 , 2 or 3, the small gas quantity disc orifice flow metering system mainly includes a flow meter 3, an electric back pressure control system and a data acquisition system. The flow meter 3 can be arranged on the upstream pipeline of the data acquisition system, and the flow meter 3 can include a plurality of standard orifice plates of different sizes and a rotating mechanism, the standard orifice plates being integrated on the rotating mechanism, the rotating mechanism being used to rotate the standard orifice plates of different sizes to a predetermined position, and the standard orifice plates of different sizes being replaced. The orifice plates of different sizes are designed in the form of a rotating disc, so that the orifice plates can be replaced, the labor intensity of the workers on site is reduced, the safety hidden danger is reduced, the on-site operation is greatly facilitated, and the problem that the orifice plates need to be replaced by removing the gas testing flow pipeline or disassembling the orifice plate pressure cap when the critical speed flow meter is used on site is effectively solved. When the fluid filled in the pipeline flows through the orifice plate in the pipeline, a local contraction is caused near the orifice plate throttling element, the flow rate is increased, and a static pressure difference is generated on the upstream and downstream sides thereof.

[0030] As shown in Figure 1 , the data acquisition system can include a wireless pressure transmitter 6, a wireless temperature transmitter 7, a nozzle 4 and a temperature sheath 5, the wireless pressure transmitter 6 being connected with the nozzle 4, and the wireless pressure sensor 6 recording the pressure data of the upstream pipeline through the nozzle 4; the wireless temperature transmitter 7 being connected with the temperature sheath 5, and the wireless temperature sensor 7 recording the temperature data of the upstream pipeline through the temperature sheath 5. Figure 3As shown, the wireless temperature transmitter 7 records the temperature data of the upstream pipeline. The data acquisition system can collect relevant data such as pressure, differential pressure, and temperature through the wireless pressure transmitter 6 and the wireless temperature transmitter 7 and transmit them to the data processing system. Under the condition of knowing the relevant parameters, the data processing system can derive the relationship between differential pressure and flow rate based on the principle of flow continuity and Bernoulli's equation to obtain the flow rate.

[0031] like Figure 1 As shown in Figure 2, the electric back pressure control system may include an electric back pressure control valve 8 and, as shown in Figure 2, an electric back pressure control valve 8. Figure 2 Alternatively, as shown in Figure 3, the power supply control system 10 has an electric back pressure control valve 8 connected to it. The electric back pressure control valve 8 is located on the downstream pipeline of the data acquisition system, for example... Figure 1 As shown, it can be installed on the downstream pipeline of the temperature jacket 5. The flow rate of the fluid flowing through the valve body of the electric backpressure control valve 8 is regulated. Here, the electric backpressure control valve 8 has a throttling effect; the test fluid will cool down after passing through the electric backpressure control valve 8. If the electric backpressure control valve 8 is installed on the upstream pipeline of the temperature jacket 5, it may cause inaccurate temperature data recorded by the wireless temperature transmitter 7. Therefore, preferably, the electric backpressure control valve 8 can be installed on the downstream pipeline of the temperature jacket 5. As one embodiment of this utility model, such as... Figure 3 As shown, the wireless pressure transmitter 6 and the wireless temperature transmitter 7 can be installed on the pipeline between the flow meter 3 and the electric back pressure control valve 8. Figure 2 As shown in Figure 3, the power supply control system 10 includes a power supply system and a control system. The power supply system provides power to the electric backpressure valve, enabling it to operate continuously for 3 days. The control system can acquire the pressure data of the electric backpressure control valve 8 and automatically control the opening stroke of the electric backpressure control valve 8.

[0032] In this exemplary embodiment, the rotating mechanism may include a dial, a gear shaft, and a positioning shaft. A standard perforated plate is integrated on the dial, and a gear shaft is provided on the dial. Rotating the gear shaft drives the perforated plate to rotate. The positioning shaft is provided with a scale that corresponds to the scale on the dial.

[0033] In this exemplary embodiment, the number of standard orifice plates may include 6 to 8, for example, 7. Of course, this invention is not limited to this; other numbers of standard orifice plates can also be used. For example, based on the required production range for testing, the size of the orifice plate flowmeter can be increased, thereby increasing the number of standard orifice plates on the orifice plate plate to cover the entire test production range. However, the wall thickness, strength, and dimensions of the flow metering system need to be recalculated and determined.

[0034] In the present exemplary embodiment, the data acquisition system can further comprise a data processing system connected with the wireless pressure transmitter and the wireless temperature transmitter, receiving the pressure data and the temperature data of the upstream pipeline and calculating the flow rate. The data processing system can be configured with a data acquisition computer. Under the condition of known parameters, the data acquisition computer can derive the relationship between the differential pressure and the flow rate according to the principle of flow continuity and the Bernoulli equation to obtain the flow rate. The data acquisition system can continuously record the pressure and temperature data and transmit them to the data acquisition computer in real time. The data acquisition system can calculate the natural gas production by using the widely recognized AGA3 calculation formula, thereby eliminating the influence of human factors and making the measurement results more accurate.

[0035] In the present exemplary embodiment, the type of the control system can comprise a PLC control system. The PLC control system can automatically control the opening degree of the valve by acquiring an external 4-20MA pressure signal and inputting the high point and the low point of the pressure to be controlled as well as the high limit and the low limit, so as to ensure that the pressure runs between the high point and the low point.

[0036] In the present exemplary embodiment, the power supply system in the power supply control system can comprise a solar panel and a battery. The solar panel is connected with the battery, the battery is connected with an inverter, and the inverter is connected with the electric back pressure control valve and the control system, i.e., the battery is connected with the electric back pressure control valve and the control system through the inverter. The solar panel collects electric energy and stores it in the battery. During operation, the battery can be connected with the inverter to convert the electric energy into a voltage for driving the electric back pressure control system, so as to supply normal work. In particular, it is not recommended to connect the power supply system with other electrical equipment for normal work of the other electrical equipment. The other electrical equipment of the present flow metering system mainly comprises a wireless pressure transmitter, a wireless temperature transmitter, and a data acquisition computer. The wireless pressure transmitter and the wireless temperature transmitter are provided with batteries, while the data acquisition computer needs to be used in the duty room and is far away from the battery of the power supply system. If the battery of the power supply system is used for power supply, a cable needs to be connected, which will affect the use of the electric back pressure control system. The data acquisition computer can also be provided with a power supply.

[0037] In the present exemplary embodiment, as shown in Figure 1 or 3, the metering system can further comprise a rectifier 2 arranged on the upstream pipeline of the flow meter. The rectifier 2 can rectify the passing turbulent fluid to form a nearly ideal laminar flow or stable turbulent flow state.

[0038] In the present exemplary embodiment, as shown in Figure 1 , 2 or 3, the metering system can further comprise a flow switching system, which can comprise a test ball valve 1, a bypass ball valve, and a bypass pipeline, as shown in Figure 1As shown in FIG. 1, FIG. 2 or FIG. 3, the test ball valve 1 is arranged on the upstream pipeline of the rectifier 2 and connected with the rectifier 2; one end of the bypass pipeline is connected with the upstream pipeline of the test ball valve 1, and the end ports of the two can be connected by an elbow; the other end is connected with the downstream pipeline of the electric back pressure control valve 8, and the end ports of the two can be connected by an elbow. Figure 2 As shown in FIG. 1, FIG. 2 or FIG. 3, the bypass ball valve 9 is arranged at any position on the bypass pipeline, preferably, the bypass ball valve 9 can be arranged on the bypass pipeline on the side of the test ball valve 1, which is more convenient to operate. When the flowmeter has a problem, for example, a leak occurs, the bypass ball valve 9 can be opened to complete the maintenance of the orifice plate flowmeter without closing the well, thereby effectively ensuring the continuity of the test operation.

[0039] In the example embodiment, the valve material of the electric back pressure control valve can include 35CRMO; the valve core, valve seat and valve cage of the electric back pressure control valve can include stainless steel. Compared with the traditional material carbon steel, the strength and corrosion resistance of carbon steel are low, and 35CRMO is formed by low alloy steel forging process, and the corrosion resistance and strength are much higher than carbon steel; in addition, the materials of the remaining vulnerable parts can also be stainless steel, which has excellent acid resistance, sulfur resistance and corrosion resistance.

[0040] In the example embodiment, the metering system as a whole includes a skid-mounted structure, and has high integration degree and convenient transportation and carrying.

[0041] In summary, the advantages of the utility model can include at least one of the following contents:

[0042] (1) The metering system provided by the utility model realizes automatic control of the opening of the valve, keeps the pressure always running between the high point and the low point, ensures the stability of the pressure in the test process, and further improves the test accuracy;

[0043] (2) The metering system provided by the utility model can continuously record the pressure and temperature data and transmit them to the data acquisition room in real time, calculate the natural gas production by using the widely recognized AGA3 calculation formula, get rid of the influence of human factors, and make the metering result more accurate;

[0044] (3) The metering system provided by the utility model adopts the combination of solar energy and battery for power supply, the power supply system is rich in reserves, and can meet the measurement needs.

[0045] Although the small gas volume disc type orifice plate flowmeter system has been described above by combining with the example embodiment, it should be clear for those skilled in the art that various modifications and changes can be made to the example embodiment of the utility model without departing from the spirit and scope defined by the claims.

Claims

1. A low air volume disc orifice flow metering system characterized by, The metering system comprises a flow meter, an electric back pressure control system and a data acquisition system, wherein, The flow meter is arranged on the pipeline upstream of the data acquisition system, and comprises a plurality of standard orifice plates of different sizes and a rotating mechanism, the standard orifice plates being integrated on the rotating mechanism, and the standard orifice plates of different sizes being rotated to predetermined positions and replaced; The data acquisition system comprises a wireless pressure transmitter, a wireless temperature transmitter, a nozzle and a temperature sheath, the wireless pressure transmitter being connected with the nozzle to acquire pressure data of the pipeline upstream; and the wireless temperature transmitter being connected with the temperature sheath to acquire temperature data of the pipeline upstream; The electric back pressure control system comprises an electric back pressure control valve and a power supply control system, the electric back pressure control valve being connected with the power supply control system, the electric back pressure control valve being arranged on the pipeline downstream of the data acquisition system, the power supply control system comprising a power supply system and a control system, the power supply system being configured to provide voltage to the electric back pressure control system, and the control system being configured to control the opening stroke of the electric back pressure control valve.

2. The low flow disc orifice flow meter system of claim 1 wherein, The rotating mechanism comprises a dial, a gear shaft and a positioning shaft, the standard orifice plates being integrated on the dial, the dial being provided with the gear shaft, the gear shaft being rotated to drive the integrated orifice plates to rotate, and the positioning shaft being provided with a scale corresponding to the scale on the dial.

3. The low flow disc orifice flow meter system of claim 1 wherein, The number of the standard orifice plates comprises 6-8.

4. The low flow disc orifice flow meter system of claim 1 wherein, The data acquisition system further comprises a data processing system, the data processing system being connected with the wireless pressure transmitter and the wireless temperature transmitter to receive pressure data and temperature data of the pipeline upstream and calculate the flow rate.

5. The low flow disc orifice flow meter system of claim 1 wherein, The control system comprises a PLC control system.

6. The low flow disc orifice flow meter system of claim 1 wherein, The power supply system comprises a solar panel, a battery and an inverter, the solar panel being connected with the battery, the battery being connected with the inverter, and the inverter being connected with the electric back pressure control valve and the control system.

7. The low flow disc orifice flow meter system of claim 1 wherein, The metering system further comprises a rectifier, the rectifier being arranged on the pipeline upstream of the flow meter.

8. The low flow disc orifice flow meter system of claim 1 wherein, The metering system further comprises a flow switching system, the flow switching system comprising a test ball valve, a bypass ball valve and a bypass pipeline, the test ball valve being arranged on the pipeline upstream of the rectifier and being connected with the rectifier, one end of the bypass pipeline being connected with the pipeline upstream of the test ball valve, the other end of the bypass pipeline being connected with the pipeline downstream of the electric back pressure control valve, and the bypass ball valve being arranged on the bypass pipeline.

9. The low flow disc orifice flow meter system of claim 1 wherein, The valve material of the electric back pressure control valve comprises 35CRMO, and the materials of the valve core, the valve seat and the valve cage of the electric back pressure control valve comprise stainless steel.

10. The low flow disc orifice flow meter system of claim 1 wherein, The metering system as a whole comprises a skid-mounted structure.

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