Double-excitation multi-electrode electromagnetic flowmeter device

Abstract

A double-excitation multi-electrode electromagnetic flowmeter device relates to the technical field of oil and gas well equipment and comprises an excitation structure, a measuring electrode, a measuring pipeline, a measuring pipeline insulating lining, an insulating shell and a measuring pipe outer wall, the measuring pipeline insulating lining is adhered to the inner wall of the measuring pipeline, and the measuring pipe outer wall is arranged on the outer wall of the measuring pipeline. The measuring pipeline is sleeved with an insulating shell, a space is formed between the insulating shell and the outer wall of the measuring pipeline, four excitation structures are installed in the space, and the excitation structures are evenly distributed on the circumferential face. Four measuring electrodes are arranged on the outer wall of the measuring pipeline and are uniformly distributed on the outer wall of the measuring pipeline. According to the double-excitation multi-electrode electromagnetic flowmeter device, the electromagnetic flowmeter is optimized by adopting an alternating frequency excitation method.

Description

Technical field:

[0001] The utility model relates to the technical field of oil and gas well equipment, in particular to an electromagnetic flowmeter device with double excitation and multiple electrodes. Background technology:

[0002] From the current development process of oil and gas fields, production profile logging technology is one of the main research contents of oil and gas field development, and flow control and monitoring is one of the important indicators of production profile logging technology. Electromagnetic flowmeter is a commonly used flow measurement equipment, which is widely used in many industrial fields. . It measures the flow rate and flow rate of liquid or gas through the interaction of electric field and magnetic field. Traditional electromagnetic flowmeters usually use unipolar magnetic excitation, that is, a pair of electromagnetic coils are used to generate magnetic field. However, in underground horizontal pipelines, due to the uneven distribution of flow velocity and the existence of interference sources, the traditional unipolar magnetic excitation method often cannot meet the measurement requirements. In underground horizontal pipelines, due to the uneven distribution of fluid in the pipeline, as well as the influence of factors such as liquid level changes and gas-liquid two-phase flow, the traditional unipolar magnetic excitation electromagnetic flowmeter cannot accurately measure the fluid flow rate and flow rate. This may lead to measurement errors, instability and reliability problems. Utility model content:

[0003] The purpose of the utility model is to overcome the shortcomings of the above-mentioned prior art and provide a dual-excitation multi-electrode electromagnetic flowmeter device, which is equipped with an electromagnetic flowmeter with multiple electrodes for flow measurement, so as to solve the problems raised in the above-mentioned background technology.

[0004] In order to solve the problems existing in the background technology, the utility model adopts the following technical scheme: it includes an excitation structure, a measuring electrode, a measuring pipe, an insulating lining of the measuring pipe, an insulating shell and an outer wall of the measuring pipe, the inner wall of the measuring pipe is adhered to the insulating lining of the measuring pipe, the outer wall of the measuring pipe is provided with an outer wall of the measuring pipe, the outer wall of the measuring pipe is covered with an insulating shell, a space is formed between the insulating shell and the outer wall of the measuring pipe, the excitation structure is installed in the space, the number of the excitation structures is four and they are evenly distributed on the circumferential surface; the outer wall of the measuring tube is provided with measuring electrodes, the number of the measuring electrodes is four and they are evenly distributed on the outer wall of the outer wall of the measuring tube, and the positions of the four measuring electrodes are staggered with the positions of the four excitation structures.

[0005] The excitation structures are divided into E1, E2, E3 and E4, wherein E1 and E3 are the same group of excitation structures, and E2 and E4 are the same group of excitation structures, thus forming two groups of relatively uniform and mutually perpendicular vector magnetic fields.

[0006] The measuring electrodes are divided into A1, A2, A3 and A4, wherein A1 and A4 are located above the flow direction of the measuring pipeline, A2 and A3 are located below the flow direction of the measuring pipeline, and two adjacent measuring electrodes are perpendicular to each other.

[0007] The A1 is a positive electrode, and A2, A3 and A4 are negative electrodes.

[0008] The excitation structure comprises a magnetic core and an excitation coil. The excitation coil is wrapped around the magnetic core. The magnetic core has a method angle of 52° and a magnetic core thickness of 1 to 3 mm. The excitation coil wrapping angle is 60°.

[0009] The beneficial effects of the utility model are:

[0010] 1. The utility model adopts a dual excitation design, which can improve the measurement accuracy, reduce the measurement error, and can measure the flow velocity and flow more accurately. It can also reduce the influence of external electromagnetic interference on the measurement results and improve the anti-interference ability of the device.

[0011] 2. The utility model configures multiple electrodes in the sensor, which can measure voltage signals at multiple points simultaneously, thereby improving the reliability and stability of the measurement.

[0012] 3. The utility model is suitable for horizontal pipelines in underground environments and can measure flow in harsh working environments, with high durability and adaptability.

[0013] 4. The utility model has a simple structure and is easy to install and maintain. The sensor is installed by a bracket fixed in the horizontal pipe, which has a simple structure and is easy to install and maintain. At the same time, compared with the traditional flow meter device, the utility model has a simpler structure and lower manufacturing cost, thus saving the cost of the enterprise. Description of the drawings:

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 It is a cross-sectional view of the utility model;

[0016] Figure 3 It is an analysis diagram of the simulation data of the utility model [(a) is the internal distribution characteristics of the magnetic field when the core angle is constant; (b) is the internal distribution characteristics of the magnetic field at different coil angles; (c) is the internal distribution characteristics of the magnetic field when the core thickness is constant]. Specific implementation method:

[0017] Reference Figure 1The utility model specifically adopts the following implementation mode: it includes an excitation structure 1, a measuring electrode 3, a measuring pipe 4, an insulating lining 5 for measuring pipe, an insulating shell 7 and an outer wall 8 of the measuring pipe. The inner wall of the measuring pipe 4 is pasted with the insulating lining 5 for measuring pipe, the outer wall of the measuring pipe 4 is provided with the outer wall of the measuring pipe 8, the outer wall of the measuring pipe 4 is covered with the insulating shell 7, a space is formed between the insulating shell 7 and the outer wall 8 of the measuring pipe, and the excitation structure 1 is installed in the space, and the number of the excitation structures 1 is four and they are evenly distributed on the circumferential surface; the outer wall of the measuring pipe outer wall 8 is provided with measuring electrodes 3, and the number of the measuring electrodes 3 is four and they are evenly distributed on the outer wall of the measuring pipe outer wall 8, and the positions of the four measuring electrodes 3 are staggered with the positions of the four excitation structures 1. The excitation structure 1 is divided into E1, E2, E3 and E4, among which E1 and E3 are the same group of excitation structures, and E2 and E4 are the same group of excitation structures, thereby forming two groups of relatively uniform and mutually perpendicular vector magnetic fields. The measuring electrodes 3 are divided into A1, A2, A3 and A4, wherein A1 and A4 are located above the flow direction of the measuring pipe 4, A2 and A3 are located below the flow direction of the measuring pipe 4, and two adjacent measuring electrodes 3 are perpendicular to each other. A1 is a positive electrode, and A2, A3 and A4 are negative electrodes. The excitation structure 1 includes a magnetic core 2 and an excitation coil 6, the magnetic core 2 is wrapped with the excitation coil 6, the magnetic core 2 has a 52° angle, the magnetic core thickness is 1 to 3 mm, preferably 2 mm; the excitation coil 6 is wrapped at a 60° angle.

[0018] The measuring pipe insulation lining 5 used needs to have corrosion resistance because a short circuit may occur after the outer wall 8 of the measuring pipe contacts the potential signal of the measuring electrode 3 and the conductive fluid may also be corrosive.

[0019] The outer insulating shell 7 used to protect the internal components needs to use a material that can shield the magnetic field. Since the magnetic field generated by the electromagnetic flowmeter itself will coexist with the magnetic field that may exist in the outside world, magnetic interference will occur, so the insulating shell 7 needs to be able to shield the magnetic field to resist interference.

[0020] The excitation coil 6 in the adopted excitation structure 1 is used to generate a magnetic field that cuts the magnetic flux lines.

[0021] The excitation structure 1 is placed between the outer wall 8 of the measuring tube and the inner wall of the insulating shell 7. The four structures 1 form two groups of excitation structure components. The two groups of excitation structure components are perpendicular to each other and act on the two groups of excitation structure components to generate uniform and mutually perpendicular magnetic fields. The symmetrically distributed excitation structures 1 are the same group of excitation structure components.

[0022] The four measuring electrodes 3 form two groups of detection electrodes, which are located in a uniform and mutually perpendicular magnetic field generated by two groups of excitation structure components, and the two groups of detection electrodes are perpendicular to each other and symmetrically distributed in two groups on the upper and lower left and right sides of the same cross-section through which the fluid of the measuring pipe 4 passes. The upper right (left) side and the lower left (right) side are one group and are symmetrically distributed. Each group consists of two electrodes, and the measuring electrodes 3 are distributed on the outer wall of the measuring tube. The measuring electrodes are one positive and three negative, i.e., the upper right side is positive and the others are negative.

[0023] Under the joint action of the two groups of excitation structural components and the two groups of detection electrodes, a vertical vector magnetic field is generated in the measurement area of ​​the sensor when the liquid flows through, and the value obtained by the measuring electrode 3 will be more accurate.

[0024] The present invention has a dual-excitation multi-electrode electromagnetic flowmeter device, which contains a measuring pipe 4 and four excitation structures 1. Among the four excitation structures 1 on the outer wall 8 of the measuring pipe, E1 and E3 are the same group of excitation structures, and E2 and E4 are the same group of excitation structures, forming two groups of relatively uniform and mutually perpendicular vector magnetic fields. The excitation structure 1 also includes an excitation coil 6 and a magnetic core 2. Two groups of measuring electrodes 3 are located on the outer wall 8 of the measuring pipe. The four measuring electrodes are A1, A2, A3 and A4. Two electrodes A1 and A4 are placed above the flow direction in the measuring pipe 4, and two electrodes A2 and A3 are placed below the flow direction of the measuring pipe 4. Two adjacent measuring electrodes 3 are perpendicular to each other, and A1 is a positive electrode, and A2, A3 and A4 are negative electrodes. The measuring pipe insulation lining 5 of the measuring pipe 4 can be installed on the inner wall of the measuring pipe 4 by gluing.

[0025] Reference Figure 3 According to an embodiment of the utility model, a dual-excitation multi-electrode electromagnetic flowmeter sensor suitable for downhole horizontal pipes is provided, a simulation diagram of the magnetic pole thickness, magnetic core angle, and magnetic core angle in the excitation structure 1 and an analysis diagram of the simulation data are provided, and the relevant data of the magnetic poles and magnetic cores in the excitation structure 1 are used to improve the accuracy of the measurement results of the electromagnetic flowmeter.

[0026] Ansoft Maxwell software was used to simulate the magnetic field and the core angles were 40°, 44°, 48°, 52° and 56° respectively. When the magnetic pole thickness was 2mm, 2.2mm, 2.4mm and 2.6mm, as shown in (c), when the core thickness d was constant, the standard deviation and average value of the magnetic induction intensity in the measuring area inside the electromagnetic flowmeter changed relatively smoothly, and with the increase of the core angle, the standard deviation of the magnetic induction intensity gradually decreased.

[0027] When the magnetic pole thickness is 2mm, 2.2mm, 2.4mm, and 2.6mm, and the magnetic pole core angle is 40°, 44°, 48°, 52°, and 56°, as shown in (a), when the magnetic core angle φ is constant, the standard deviation and coefficient of variation of the magnetic induction intensity in the internal measurement area of ​​the electromagnetic flowmeter are relatively stable when the magnetic core thickness is d = 2.2mm to 2.4mm, and as the magnetic core thickness increases, the standard deviation and coefficient of variation of the magnetic induction intensity gradually increase. The average value of the magnetic induction intensity inside the measurement area changes steadily, showing a trend of uniform increase.

[0028] When the magnetic pole thickness is 2mm, 2.2mm, 2.4mm, and 2.6mm, and the coil angle θ is 60°, 70°, and 80°, as shown in (b), when the magnetic pole thickness is constant, the standard deviation and average value of the magnetic induction intensity in the measurement area inside the flowmeter change significantly; and as the coil angle increases, the standard deviation and average value of the magnetic induction intensity gradually increase. The coefficient of variation increases first and then decreases with the increase of the coil angle.

[0029] Therefore, when the magnetic core is placed at an angle of 52°, the magnetic core thickness is 2 mm, and the excitation coil angle is 60°, the magnetic field in the internal measuring area of ​​the electromagnetic flowmeter is the most uniform, thereby improving the measurement accuracy of the electromagnetic flowmeter.

[0030] In summary, the present invention has a dual-excitation multi-electrode electromagnetic flowmeter device, which uses a bipolar magnetic excitation method to generate a magnetic field. Two pairs of excitation coils are provided in the flowmeter device, which are located on the upper and lower sides of the pipeline respectively. By applying current to the two pairs of coils, a magnetic field can be generated, so that a uniform and stable magnetic field distribution is formed in the fluid flow environment. The flowmeter device of the utility model is equipped with a plurality of measuring electrodes. These measuring electrodes are evenly distributed along the radial direction of the measuring pipeline according to a specific layout method. When the fluid flows through the measuring electrode, the change in potential difference will be sensed and measured. In view of the special environment of the horizontal pipeline downhole, the utility model optimizes the layout of the sensor. In the implementation scheme, the selected position of the excitation coil and the measuring electrode and the parameters such as the spacing will be carefully calculated and designed. By reasonably configuring the sensor position, the influence of downhole interference factors on the measurement results can be minimized, and the stability and reliability of the measurement signal can be improved. Considering the special requirements of the downhole environment, the flowmeter device of the utility model patent has a corrosion-resistant and high-temperature resistant design. The device uses special materials and coatings, which can effectively cope with chemical corrosion and high temperature conditions in the downhole environment. This can ensure that the device can operate stably for a long time in harsh environments and extend its service life.

Claims

1. A dual-excitation multi-electrode electromagnetic flowmeter device, Features: The invention comprises an excitation structure (1), a measuring electrode (3), a measuring pipe (4), an insulating lining (5) for the measuring pipe, an insulating shell (7) and an outer wall (8) of the measuring pipe. The inner wall of the measuring pipe (4) is adhered with the insulating lining (5) for the measuring pipe, the outer wall of the measuring pipe (4) is provided with the outer wall of the measuring pipe (8), the outer shell (7) of the measuring pipe (4) is covered with an insulating shell, a space is formed between the insulating shell (7) and the outer wall (8) of the measuring pipe, and the excitation structure (1) is installed in the space. The number of the excitation structures (1) is four and they are evenly distributed on the circumferential surface. The outer wall of the measuring pipe outer wall (8) is provided with measuring electrodes (3). The number of the measuring electrodes (3) is four and they are evenly distributed on the outer wall of the measuring pipe outer wall (8), and the positions of the four measuring electrodes (3) are staggered with the positions of the four excitation structures (1).

2. The dual-excitation multi-electrode electromagnetic flowmeter device according to claim 1, Features: The excitation structure (1) is divided into E1, E2, E3 and E4, wherein E1 and E3 are the same group of excitation structures, and E2 and E4 are the same group of excitation structures, thus forming two groups of relatively uniform and mutually perpendicular vector magnetic fields.

3. The dual-excitation multi-electrode electromagnetic flowmeter device according to claim 1, Features: The measuring electrodes (3) are divided into A1, A2, A3 and A4, wherein A1 and A4 are located above the flow direction of the measuring pipe (4), A2 and A3 are located below the flow direction of the measuring pipe (4), and two adjacent measuring electrodes (3) are perpendicular to each other.

4. The dual-excitation multi-electrode electromagnetic flowmeter device according to claim 3, Features: A1 is the positive electrode, and A2, A3 and A4 are the negative electrodes.

5. The dual-excitation multi-electrode electromagnetic flowmeter device according to claim 1, Features: The excitation structure (1) comprises a magnetic core (2) and an excitation coil (6), the magnetic core (2) is wrapped with the excitation coil (6), the magnetic core (2) has an angle of 52°, and a thickness of 1 to 3 mm; the excitation coil (6) has a wrapping angle of 60°.

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