CN220893478U

CN220893478U - Device for measuring flow of crude oil pipeline

Info

Publication number: CN220893478U
Application number: CN202322886592.9U
Authority: CN
Inventors: 张向维
Original assignee: Beijing Xin Yuan Hua You Technology Co ltd
Current assignee: Beijing Xin Yuan Hua You Technology Co ltd
Priority date: 2023-10-26
Filing date: 2023-10-26
Publication date: 2024-05-03
Anticipated expiration: 2033-10-26

Abstract

The utility model provides a device for measuring the flow of a crude oil pipeline, which relates to the technical field of measurement and comprises a coil system, a measuring circuit and a pressure sensor, wherein the coil system is wound on the outer surface of the crude oil pipeline and comprises a transmitting coil and a receiving coil. The measuring circuit comprises an amplifier, a filter, a control chip, a transmission module, an excitation module and a power supply; the transmitting coil is connected with the control chip through the excitation module; the control chip is respectively connected with the filter and the transmission module; the receiving coil, the amplifier and the filter are connected in sequence. One end of the pressure sensor is connected with the inner surface of the crude oil pipeline, and the other end of the pressure sensor is connected with the measuring circuit. The utility model has simple structure, realizes the measurement of flow by measuring the average speed of the fluid in the crude oil pipeline through the transmitting coil and the receiving coil, has no contact with the internal fluid, avoids the corrosion and the abrasion of parts, and has longer service life and stable testing performance.

Description

Device for measuring flow of crude oil pipeline

Technical Field

The utility model relates to the technical field of measurement, in particular to a device for measuring the flow of a crude oil pipeline.

Background

The current electromagnetic flowmeter adopts a mode of exciting coils and measuring electrodes. The common electromagnetic flowmeter only measures the magnitude of an induced voltage signal, and is easily influenced by instability of a transmitting source, such as temperature, power supply voltage change and the like. In addition, the electrode is easy to be corroded and polluted by liquid, if the liquid to be detected is strong corrosive liquid, the electrode is specially required to be subjected to corrosion prevention and pollution prevention technology, and the electrode is required to be good in electric conduction, so that the technology is complex and high in cost, and the risk of corrosion leakage is increased at the electrode mounting position after long-time working. In addition, there is a method using a radioactive tracer, which uses the principle of radioactivity measurement and the principle of cross-correlation calculation, but this method is not friendly to the environment and is costly.

Disclosure of utility model

The utility model aims to provide a device for measuring the flow of a crude oil pipeline, so as to solve the problems. In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

the application provides a device for measuring the flow of a crude oil pipeline, which comprises a coil system, a measuring circuit and a pressure sensor, wherein the coil system comprises a transmitting coil and a receiving coil, and the coil system is wound on the outer surface of the crude oil pipeline. The measuring circuit comprises an amplifier, a filter, a control chip, a transmission module, an excitation module and a power supply; the transmitting coil is connected with the control chip through the excitation module; the control chip is respectively connected with the filter and the transmission module; the receiving coil is connected with the amplifier, the amplifier is connected with the filter, and the amplifier, the filter, the control chip and the transmission module are all connected with the power supply. One end of the pressure sensor is connected with the inner surface of the crude oil pipeline, and the other end of the pressure sensor is connected with the measuring circuit.

Further, the transmitting coil and the receiving coil are both wound around the central axis of the crude oil pipeline in a circumferential direction; the number of the receiving coils is two, the number of the transmitting coils is one, and the transmitting coils are positioned between the two groups of receiving coils.

Further, the transmitting coil and the receiving coil are both wound around the central axis of the crude oil pipeline in a circumferential direction; the number of the receiving coils is larger than two groups, the number of the transmitting coils is one group, and the receiving coils are arranged on two sides of the transmitting coils along the axial array of the crude oil pipeline.

Further, the transmitting coil is wound around the central shaft of the raw oil pipeline in a circumferential direction; the receiving coils are wound into round-corner rectangular connecting crude oil pipelines, the receiving coils are equally distributed on two sides of the transmitting coils, the number of the receiving coils on each side is more than or equal to four groups and less than or equal to thirty-six groups, the receiving coils on each side are arrayed along the radial direction of the crude oil pipelines, and the receiving coils are mutually parallel.

Further, the transmitting coil simultaneously transmits alternating current signals with different frequencies, and the receiving coil which is farther from the transmitting coil receives alternating current signals with lower frequencies, and the receiving coil which is closer to the transmitting coil receives alternating current signals with higher frequencies.

Further, the receiving coil adopts a flexible PCB coil.

Further, each of the rounded rectangles is composed of a single-layer or multi-layer coil.

Further, the model of the amplifier is AD620, the model of the filter is UAF42, and the model of the control chip is STM32F103; the transmission module model is SIM900A, and the excitation module model is L298N.

The beneficial effects of the utility model are as follows:

The utility model has simple structure, realizes the measurement of flow by measuring the average speed of fluid in the crude oil pipeline through the transmitting coil and the receiving coil, has no contact with the internal fluid, avoids the corrosion and abrasion of parts, has longer service life and stable testing performance, can detect the blockage condition in the crude oil pipeline, and avoids blockage risks.

Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the embodiments of the utility model. The objectives and other advantages of the utility model will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram showing the arrangement of a receiving coil in embodiment 1 of the present utility model;

fig. 2 is a schematic diagram of a receiving coil arrangement in embodiment 2 of the present utility model;

fig. 3 is a schematic diagram showing the arrangement of the receiving coil in embodiment 3 of the present utility model.

The marks in the figure:

1. A crude oil pipeline; 2. a transmitting coil; 3. a receiving coil; 4. a pressure sensor; 5. a measurement circuit; 51. an amplifier; 52. a filter; 53. a control chip; 54. a transmission module; 55. an excitation module; 56. and a power supply.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present utility model, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance.

Example 1:

As shown in fig. 1, the present embodiment provides an apparatus for measuring the flow rate of a crude oil pipe, comprising a coil system, a measuring circuit 5 and a pressure sensor 4, wherein the coil system comprises a transmitting coil 2 and a receiving coil 3, and the coil system is wound on the outer surface of the crude oil pipe 1. The measuring circuit comprises an amplifier 51, a filter 52, a control chip 53, a transmission module 54, an excitation module 55 and a power supply 56; the transmitting coil 2 is connected with the control chip 53 through the excitation module 55; the control chip 53 is respectively connected with the filter 52 and the transmission module 54; the receiving coil 3 is connected with an amplifier 51, the amplifier 51 is connected with a filter 52, and the amplifier 51, the filter 52, the control chip 53 and the transmission module 54 are all connected with a power supply 56. One end of the pressure sensor 4 is connected with the inner surface of the crude oil pipeline 1, and the other end is connected with the measuring circuit 5. In order to reduce interference of external useless signals, the receiving coil 3 adopts a process of covering a nonmagnetic metal film. To increase the excitation signal, the transmitting coil 2 employs a magnetism-collecting material to increase the electromagnetic field strength per unit volume.

The model of the amplifier 51 is AD620, the model of the filter 52 is UAF42, and the model of the control chip 53 is STM32F103; the transmission module 54 is of a model SIM900A, and the excitation module 55 is of a model L298N.

The transmitting coil 2 and the receiving coil 3 are both wound around the central axis of the crude oil pipeline 1 in a circumferential direction; the number of the receiving coils 3 is two, the number of the transmitting coils 2 is one, and the transmitting coils 2 are positioned between the two groups of the receiving coils 3.

The control chip 53 controls the excitation module 55 to cause the transmitting coil 2 to transmit an alternating electromagnetic field. The liquid flowing in the crude oil pipeline 1 moves in the alternating electromagnetic field, and generates induced eddy currents, and the induced eddy currents generated by the liquids in different forms are slightly different.

Due to the principle of electromagnetic induction, the eddy current is detected by the receiving coil 3 and induced voltages are generated at two ends of the receiving coil 3, the induced voltages are amplified, filtered, digitally quantized and the like by the measuring circuit to form quantized voltage curves, and then the control chip 53 calculates the time offset of two similar curves by comparing the voltage curves of the two receiving coils 3 and utilizing the principle of probability theory and statistics, so as to obtain the time T for the fluid to move from the point A to the point A'.

The distance D and time T of the AA' point are known. From this, the speed V of the object motion (v=d/T) can be obtained. The cross-sectional area S of the crude oil pipeline 1 is known, the flow pattern is fixed, and the volume flow l=s×v is obtained. Assuming that the average density of the fluid is unchanged, the mass flow is obtained.

The pressure sensor 4 transmits the fluid pressure in the crude oil pipe 1 to the control chip 53. The control chip 53 transmits the mass flow calculation result to the gathering and transportation station through the transmission module 54, so as to realize the monitoring of the flow.

Example 2:

The embodiment provides a device for measuring the flow of a crude oil pipeline, which comprises a coil system, a measuring circuit 5 and a pressure sensor 4, wherein the coil system comprises a transmitting coil 2 and a receiving coil 3, and the coil system is wound on the outer surface of the crude oil pipeline 1. The measuring circuit comprises an amplifier 51, a filter 52, a control chip 53, a transmission module 54, an excitation module 55 and a power supply 56; the transmitting coil 2 is connected with the control chip 53 through the excitation module 55; the control chip 53 is respectively connected with the filter 52 and the transmission module 54; the receiving coil 3 is connected with an amplifier 51, the amplifier 51 is connected with a filter 52, and the amplifier 51, the filter 52, the control chip 53 and the transmission module 54 are all connected with a power supply 56. One end of the pressure sensor 4 is connected with the inner surface of the crude oil pipeline 1, and the other end is connected with the measuring circuit 5. In order to reduce interference of external useless signals, the receiving coil 3 adopts a process of covering a nonmagnetic metal film. To increase the excitation signal, the transmitting coil 2 employs a magnetism-collecting material to increase the electromagnetic field strength per unit volume.

As shown in fig. 2, the transmitting coil 2 and the receiving coil 3 are both wound circumferentially around the central axis of the crude oil pipe 1; the number of the receiving coils 3 is larger than two groups, the number of the transmitting coils 2 is one group, and the receiving coils 3 are arranged on two sides of the transmitting coils 2 along the axial array of the crude oil pipeline 1.

In this embodiment, six sets of receiving coils 3 are adopted, three sets of receiving coils 3 with different distances are respectively arranged on two sides of the transmitting coil 2, the transmitting coil 2 simultaneously transmits alternating current signals with different frequencies, signals with high frequencies are used by receiving coils 3 with short distances from the transmitting coil 2, signals with middle frequencies are used by receiving coils 3 with middle distances from the transmitting coil 2, and signals with low frequencies are used by receiving coils 3 with long distances from the transmitting coil 2.

The two groups of receiving coils 3 closest to the transmitting coil 2 have high resolution and are suitable for the condition of low flow velocity; and two sets of receiving coils 3 far from the transmitting coil 2 have low resolution, mainly for the case of fast flow velocity.

When the flow rate is fast, since the observation window is small, the two sets of receiving coils 3 nearest to the transmitting coil 2 may not reflect that the measured fluid has passed, and the correlation coefficient of the two curves is small, so that the correlation is not easy to find. In this case, the receiving coil 3 is located at a distance from the transmitting coil 2, and instead, the observation window is large, so that the change in the fluid flow can be observed more integrally, and the correlation coefficient is higher, so that the accuracy of calculation is higher than the former.

When the flow rate is slow, the property of the fluid is greatly changed by long time of the receiving coil 3 far from the transmitting coil 2, and the correlation coefficient is reduced, which is disadvantageous to calculate the offset time T. At this time, since the observation window is small and the resolution is high, the measurement results of the two sets of receiving coils 3 distant from the transmitting coil 2 are more accurate. The embodiment solves the influence caused by the speed of the flow rate. And the position section where the blockage or leakage occurs in the crude oil pipeline 1 can be found in time through the comparison of the whole flow and the pressure, so that the blockage or leakage can be found in time and related treatment can be carried out.

Example 3

As shown in fig. 3, the transmitter coil 2 is wound circumferentially around the central axis of the crude oil pipe 1; the receiving coils 3 are wound into round-angle rectangular connecting crude oil pipelines 1, the receiving coils 3 are equally distributed on two sides of the transmitting coil 2, the number of the receiving coils 3 on each side is more than or equal to four groups and less than or equal to thirty-six groups, the receiving coils 3 on each side are radially arrayed along the crude oil pipelines 1, and the receiving coils 3 of each group are mutually parallel to the receiving coils 3.

The receiving coil 3 adopts a flexible PCB coil, and each round rectangle consists of a single-layer coil or a multi-layer coil.

The movement of the fluid in the crude oil pipeline 1 is not completely uniform, the crude oil is a mixture of brine, sand, petroleum and the like, and a large amount of sand and a high-viscosity mixture are accumulated at the bottom of the crude oil pipeline 1 under the influence of viscosity and gravity, so that the bottom resistance is high. Thus, the flow rate of the fluid is greater at the top of the crude oil pipeline 1 than at the bottom of the crude oil pipeline 1. The arrangement mode of the receiving coils 3 in the embodiment can be used for measuring the fluid flow of different levels of the crude oil pipeline 1.

In addition, the receiving coil 3 is added in the second embodiment, and the array receiving coil 3 with high frequency, low frequency and medium frequency is arranged, so that the influence caused by the speed of the fluid flow is eliminated.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.

Claims

1. An apparatus for measuring crude oil pipeline flow, comprising:

The coil system comprises a transmitting coil (2) and a receiving coil (3), and is wound on the outer surface of the crude oil pipeline (1);

A measurement circuit (5) comprising an amplifier (51), a filter (52), a control chip (53), a transmission module (54), an excitation module (55) and a power supply (56); the transmitting coil (2) is connected with the control chip (53) through the excitation module (55); the control chip (53) is respectively connected with the filter (52) and the transmission module (54); the receiving coil (3) is connected with an amplifier (51), the amplifier (51) is connected with a filter (52), and the amplifier (51), the filter (52), a control chip (53) and a transmission module (54) are all connected with a power supply (56);

And one end of the pressure sensor (4) is connected with the inner surface of the crude oil pipeline (1), and the other end of the pressure sensor (4) is connected with the measuring circuit (5).

2. The device for measuring the flow of a crude oil pipeline according to claim 1, characterized in that the transmitting coil (2) and the receiving coil (3) are both wound circumferentially around the central axis of the crude oil pipeline (1); the number of the receiving coils (3) is two, the number of the transmitting coils (2) is one, and the transmitting coils (2) are positioned between the two groups of the receiving coils (3).

3. The device for measuring the flow of a crude oil pipeline according to claim 1, characterized in that the transmitting coil (2) and the receiving coil (3) are both wound circumferentially around the central axis of the crude oil pipeline (1); the number of the receiving coils (3) is larger than two, the number of the transmitting coils (2) is one, and the receiving coils (3) are arranged on two sides of the transmitting coils (2) along the axial array of the crude oil pipeline (1).

4. The device for measuring the flow of a crude oil pipeline according to claim 1, characterized in that the transmitting coil (2) is wound circumferentially around the central axis of the crude oil pipeline (1); the receiving coils (3) are wound into round-corner rectangular connecting crude oil pipelines (1), the receiving coils (3) are equally divided into two sides of the transmitting coils (2), the number of the receiving coils (3) on each side is more than or equal to four groups and less than or equal to thirty-six groups, the receiving coils (3) on each side are arrayed along the radial direction of the crude oil pipelines (1), and the receiving coils (3) are mutually parallel between each two receiving coils (3).

5. A device for measuring crude oil pipeline flow according to claim 3, characterized in that the transmitting coils (2) simultaneously transmit alternating signals of different frequencies, the receiving coil (3) farther from the transmitting coils (2) receiving alternating signals of lower frequency, and the receiving coil (3) closer to the transmitting coils (2) receiving alternating signals of higher frequency.

6. The device for measuring the flow of crude oil pipelines according to claim 4, characterized in that the receiving coil (3) adopts a flexible PCB coil.

7. The apparatus for measuring crude oil pipeline flow according to claim 4, wherein each of the rounded rectangles consists of a single-layer or multi-layer coil.

8. The device for measuring the flow of a crude oil pipeline according to claim 1, wherein the amplifier (51) is of the type AD620, the filter (52) is of the type UAF42, and the control chip (53) is of the type STM32F103; the transmission module (54) is of a SIM900A type, and the excitation module (55) is of an L298N type.