WO2003083415A1

WO2003083415A1 - A multiphase level sensor

Info

Publication number: WO2003083415A1
Application number: PCT/CN2003/000216
Authority: WO
Inventors: Qiming Wang; Yize Sun; Fuwen Wang; Chunhe Li; Wenqi Li; Guangdong Hu
Original assignee: Qiming Wang; Yize Sun; Fuwen Wang; Chunhe Li; Wenqi Li; Guangdong Hu
Priority date: 2002-03-29
Filing date: 2003-03-25
Publication date: 2003-10-09
Also published as: AU2003227460A1; CN1207540C; CN1375435A

Abstract

The invention relates to a multiphase level sensor pertaining to detection field. An object of the invention is to provide a sensor which not only can detect an interface between oil and water in a tank, but also can accurately detect a wide range of levels of crude oil, sullage, mud and sand. The sensor is provided with a capacitance transducer and a connection body. The invention is characterized by an inner insulating sleeve disposed at the outside of the connection body, a plurality of tubular metal sub-poles mounted at the outside of the inner insulating sleeve, insulating layers mounted between adjacent sub-poles, an outside insulating sleeve enclosing the outside of the sub-poles, and cables provided in the inside of the connecting body, through which the sub-poles are connected with the capacitance transducer.

Description

Multi-phase material level sensor

The invention relates to a measuring device, in particular to a multi-phase material level sensor capable of measuring a full range of crude oil, sewage, and sediment in an oil storage tank. Background technique

At present, crude oil produced from oil wells in the oil field is qualified commercial crude oil after depuration and dehydration processes, and is injected into various oil storage tanks for external transportation or transfer. Due to incomplete impurity removal and dehydration, over time, a thick layer of sludge will be deposited on the bottom of the oil storage tank, and there will be a section of sewage on it, and crude oil will be on the sewage. Because the oilfield needs to know the production of the oil production plant at any time, it is necessary to regularly measure the oil storage capacity. However, the current measurement method is to manually climb up the oil tank and use a rope or a tape measure to hang a heavy object from the artificial mouth to measure the amount of oil, which is laborious and inaccurate. In recent years, some people have used the ultrasonic ranging method instead of manual measurement, and some have also sunk a static pressure sensor near the bottom of the pipe to directly measure the height of the oil level. Although the test accuracy of this method is high, the measured data is the height from the probe to the oil level. It is not known how much crude oil, sewage, and sludge each occupy. If you want to obtain the exact amount of crude oil, you must not only know the oil level. Height, you must also know the location of the oil and water surface. At present, there are many interface instruments used in oil fields. In principle, they are mainly divided into float type, differential pressure type, capacitance type, nuclear type and so on. In practical applications, the oil-water interface is very complicated due to the difference in oil-water density and the influence of factors such as electric fields, temperature, and pressure. Various interface instruments have limitations and cannot effectively and accurately perform real-time and accurate measurements on the oil-water interface and the phase levels. measuring. US 005103368A discloses a material level sensor that can only measure single-phase product oils with good fluidity. When measuring multi-phase materials, the electrodes are easily short-circuited, but cannot contain water and sludge multi-phase. Mixed crude oil is used for interface and level measurement, and the range is small. CN2341131Y discloses a crude oil tank detection device, which can only measure the oil-water interface, cannot measure continuously, and is cumbersome to operate and poor in practicability. The two poles of the above two devices for the capacitance sensor are provided by the device itself, the distance is very close, and they are easily affected by the hanging material. Summary of the Invention

In order to overcome the technical shortage that the existing level sensor cannot measure the multi-phase level, the present invention provides a multi-phase level sensor, which can not only detect the position of the oil-water interface in the oil storage tank, but also The level of sewage and sediment is measured in a full range and with high accuracy. The technical solution adopted by the present invention to solve its technical problems is: a capacitance transmitter and a connection body are provided, and the technical features are that an inner insulation sleeve is provided on the outside of the connection body, and a plurality of tubular metal sub-poles are provided on the outside of the inner insulation sleeve. An insulating layer is provided between two adjacent sub-poles. All the sub-poles are covered with an outer insulation sleeve, and the inner cavity of the inner insulation sleeve is provided with a cable. The sub-poles are electrically connected to the capacitor transmitter through the cable. The inner cavity of the inner insulation sleeve is provided with a module. The function of the module is to connect all metal sub-poles to the capacitor transmitter through the module and a limited number of wires, and to realize the time-division measurement of each metal sub-pole under the control of the capacitor transmitter. The module is composed of multiple analog switches and a shift register. The data output terminal of the shift register is electrically connected to the strobe terminal of the multiple analog switch, and the output terminals of the multiple analog switch are respectively electrically connected to multiple poles adjacent to each other. The control end of the shift register is electrically connected to the cable via a wire. The module can also be composed of multiple analog switches and decoders. The multiple analog switches and decoders are electrically connected to each other. The data output end of the decoder is electrically connected to the multiple analog switch gating control end. By connecting the necessary expansion chip, the decoder It can be connected with multiple analog switches, the output ends of the multiple analog switches are respectively connected to adjacent multiple sub-poles, and the control end of the decoder is electrically connected to the cable via a wire. The sub-poles are electrically connected to the cable wires through the wires. The connection body is a rigid pipe. The connecting body can also be a steel cable. The inner insulation sleeve is composed of multiple sections of inner insulation tubes connected in series. Both ends of the inner insulation tube are provided with a mortar head and a mortar bowl. A mortar is used between the ends of the adjacent two sections of the inner insulation tube. The head and the mortar bowl are structurally matched. The mortar head and the mortar bowl are respectively processed with a cable hole and a steel cable hole. Several steel cables pass through the steel cable hole in the inner insulation tube to form the main poles of the sub-poles and the tank of the oil storage tank. The body is the other pole, which constitutes a variable dielectric capacitor. By measuring the capacitance value between each pole and the tank, it can be determined what the medium is at the pole position, and the position of the oil-water interface can be accurately found.

The beneficial effect of the invention is that the position of the oil-water interface can be measured accurately and in real time, and at the same time, the full range measurement of crude oil, pollution and sediment levels in multiphase materials can be performed, the structure is simple, and Multiphase materials between the main pole and the tank Short circuit. BRIEF DESCRIPTION OF THE DRAWINGS

The invention is further described below with reference to the drawings and embodiments.

FIG. 1 is a schematic diagram of the overall structure of the present invention.

Fig. 2 is a partial longitudinal sectional structural view of a main pole of the first embodiment of the present invention.

Fig. 3 is a partial longitudinal sectional structural view of a main pole according to the second and third embodiments of the present invention. Fig. 4 is a circuit diagram of a module in the second embodiment.

FIG. 5 is a schematic diagram of a connection relationship between a module, a cable, and a pole in the second embodiment. Fig. 6 is a circuit schematic diagram of a module in a third embodiment.

FIG. 7 is a schematic diagram of a connection relationship between a module, a cable, and a pole in a third embodiment. In the figure 1. capacitor transmitter, 2. flange, 3. upper insulator, 4. polarizer, 5. outer insulation sleeve, 6. lower insulation sleeve, 7. cable, 8. insulation layer, 9. connection Body, 10. module, 11. wire, 12. inner insulation sleeve, 13. outer insulation sleeve, 14. decoder, 15. multi-channel analog switch, 16. capacitor signal line, 17. coded signal line, 18. power line , 19. Power ground, 20. Capacitive signal line, 21. Serial data input line, 22. Serial clock line, 23. Power line, 24. Power line, 25. Shift register, 26. Multiple analog switch 27. Serial data output lines, C001, C002, C003, C011, C012, C013, C021, C022, C023 are polarized. detailed description

In FIG. 1, FIG. 2, and FIG. 3, the metal main pole of the present invention is composed of a plurality of tubular metal sub-poles (4) connected in series to a connecting body (9) wrapped with an inner insulation sleeve (12) on the outside, and the inner insulation sleeve ( The main purpose of 12) is to isolate each sub-pole (4) from the connecting body (9) and other conductive parts. An insulating layer (8) is provided between two adjacent sub-poles (4), and the connecting body ( 9) The inner cavity is provided with a cable (7), and an outer insulation sleeve (13) is provided around the outside of the main pole. The main function of the outer insulation sleeve (13) is to connect the sub-poles (4) and the entire sensor to the measured conductivity. The medium (such as water) is isolated. The upper and lower ends of the main metal pole are respectively provided with an upper insulator (3) and a lower insulator (6). The upper end of the main pole is fixed on the flange (2) and the flange (2). Capacitor transmitter (1) is fixed via insulator (3), flange (2) is insulated The edge pad and the oil storage tank are insulated and fixed, and the main pole and the tank wall of the oil storage tank are respectively one pole of a capacitor. In the first embodiment shown in FIG. 2, the connecting body (9) is a flexible steel cable, and the steel cable is located in the inner cavity of the inner insulation sleeve (12). The inner insulation sleeve (12) is composed of a plurality of serially connected inner wires. The two ends of the inner insulating tube are provided with a mortar head and a mortar bowl. The ends of the two adjacent inner insulation tubes are matched with a mortar head and a mortar bowl. The mortar head and the mortar bowl are respectively processed with cable holes. And steel cable holes, several steel cables pass through the steel cable in the inner cavity of the insulation tube to connect the sections of the insulation tube in series, and the steel cables are tightened and fixed at both ends of the main pole, so that the insulation tubes in each section are tight. Tightly stuck together. The inner insulating sleeve (12) is sleeved with a tubular metal sub-pole (4) with a number of not less than nine sections, and an insulating layer (8) is provided between two adjacent sub-poles (4) to surround the sub-poles (4). An outer insulating sleeve (13) is provided on the outside, and a cable (7) is provided in the inner cavity of the inner insulating sleeve (12). The upper end of the cable (7) is connected to the capacitor transmitter (1), and the cable (7) It is composed of multiple wires, each wire is only electrically connected to one sub-pole (4), and a weight body is fixed on the lower insulator (6) at the lower end of the main pole, so that the flexible main pole is always in a vertical state.

Its working principle is that, under the control of a microcomputer, the capacitance transmitter (1) is successively connected to each sub-pole (4) on the main pole, and at the same time when a sub-pole (4) (such as: C001) is turned on , And other sub-poles (4) (such as: C002, C003, C011, C012, C032, C033) are kept disconnected. After each sub-pole (4) is turned on, it is recorded in the memory by the capacitor transmitter (1). After the capacitance values of all the sub-poles (4) are measured, the capacitance transmitter (1) performs centralized processing on the data. For each sub-pole (4), since the two poles (dipoles) of the capacitor are formed And the distance between the chamber and the wall have been fixed, so the measured capacitance value depends only on the nature of the medium between the two poles. Specifically, it is what medium is recharged and the dielectric coefficient of the medium (air, The relative dielectric constants of crude oil, sludge, and water are 1.0, 3.0-5.0, 40-60, 80 respectively. At the same time, because the material distribution has a certain continuity and correlation, the corresponding software is used to Systematic analysis and analysis of each measured split capacitor Li, you can know the distribution of materials in a large tank.

In the second embodiment shown in FIG. 3, FIG. 4, and FIG. 5, compared with the first embodiment, the inner insulation sleeve (12) of the connecting body (9) is provided with a plurality of modules (10) in the inner cavity, Each module (10) is electrically connected to several sub-poles (4) around it, and the control ends of all modules (10) are sequentially connected together to several wires of the cable (7). The blocks (10) are all connected to the same wires in the cable (7), thereby greatly reducing the number of wires in the inner insulation sleeve (12) and the cavity cable (7). The specific connection relationship is that each module (10) consists of a serial encoder / decoder (14) (such as: V05027, etc.) and several multi-channel analog switches (15) (such as: CD4066, etc.) and the necessary peripheral auxiliary Component composition. The data output of the decoder (14) is electrically connected to the multiplex analog switch

The strobe control terminal of (15), the output terminal of the multi-channel analog switch (15) is connected to the adjacent metal sub-poles (4), and the first multi-channel analog switch (15) is connected to the C001, C002, and C003 points. Pole, the second multiplex analog switch (15) is connected to C011, C012, C013, and the third multiplex analog switch (15) is connected to C021, C022, C023. Each module (10) also leads to four counties, and is connected to the four wires in the cable (7) connected by the capacitor transmitter (1), which are the capacitor signal wires (16) (and the module The input terminals X, Y, and Z of all multi-channel analog switches are connected), the coding signal line (17) (connected to the data input terminal of the decoder), the power supply line (18) (connected to the power pins of all integrated blocks of the module) 1. Power ground wire (19) (connected to the power ground pins of all integrated blocks in the module).

The specific working process is that the encoder / decoder (14) of each module (10) has its own unique address A1-A8, A1-A8 can be encoded in advance by grounding, power supply, and floating. The encoded signal sent by the capacitance transmitter (1) includes 8-bit address and 4-bit data (different pulse duty cycles and combinations to indicate different logic states). If the address transmitted through the encoded signal line (17) Same as the address of the encoder in a module (10), the 4-bit data in the encoded signal will be latched to the data output of the decoder (14) of the module (10), and then output to the multi-channel analog switch integration The gate control terminal of the block (15) controls a certain sub-pole (4) (such as C001) connected to it to realize electrical connection with the capacitor signal line (16), and the other sub-poles (C002, C003, C011> C012> C013, C021, C022, C023) and the capacitor signal line (16) are still disconnected. In this way, different addresses and data are transmitted through the coded signal line (17) at different times, and all sub-poles (4) can be realized. Separate measurement of capacitance value. In this way, the oil-water interface and level in the tank can be measured. Capacitive signal lines of all modules (10) in this embodiment

(16), the coding signal line (17), the power supply line (18) and the power ground line (19) are connected to the four wires in the cable line (7) respectively.

The third embodiment shown in Figs. 3, 6, and 7 is the same as the second embodiment. The module (10) consists of a shift register (25) (eg: 74LS164) and several (eg: one) multiplex analog switches (26) (eg: 4066) and necessary peripheral auxiliary components. The shift register The data output terminals (QO-Q7) of (25) are connected to the gating control terminals (A, B, C) of the multi-channel analog switch (26),

The outputs of the multi-channel analog switches (26) of the three modules are respectively connected to adjacent metal sub-poles C001, C002, C003> C011, C012, C013, C021, C022, C023, and each module (10) leads 5 The wires are connected to the corresponding wires in the cable (7) connected to the capacitor transmitter (1), which are the capacitor signal wires (20).

(Extracted after the output terminals X, Υ, ZO of the multi-channel analog switch integrated block are connected), serial data input line (21) (extracted from the serial data input pin of the shift register), serial clock line (22 ) (From the clock pins of the shift register), power line (23) (connected to the power pins of all the integrated blocks in the module), power ground (24) (connected to the power ground pins of all the integrated blocks in the module) Connected), in addition, there is a serial data output line

(27) is derived from the Q2 terminal of the data output terminal of the shift register (25) and is used for connection with the serial data input terminal of the shift register (25) in the next adjacent module (10). The cable (7) in this embodiment only needs to include 5 wires (11) to select and control all the sub-poles.

The specific working process is that for all serial modules (10), each time the clock input transitions, the data at its data input end will be moved to Q0 and latched. At the same time, the data of Q0 is shifted to Q1 and latched. And so on. Therefore, if the system is connected with n poles (COOK C002, C003, C011, C012 ..., C0n2, C0n3 ..., Cn03) in total, there is only one bit of strobe data in the cycle formed by 3n clock pulses It is "1", and the remaining sub-poles are kept disconnected from the capacitor signal line. In this way, through the dedicated test circuit in the capacitor transmitter (1), the measurement of all sub-pole (4) capacitor signals will be completed in order.

The connecting body (9) of the present invention may also be a rigid structure, that is, the connecting body (9) is a rigid pipe, an inner insulating sleeve (12) is provided on the outside of the rigid pipe, and the cable (7) is located in the rigid pipe. Inner cavity, no weight body is needed at the lower end of the rigid main pole.

Claims

Rights request

1. A multi-phase material level sensor provided with a capacitance transmitter and a connecting body, which is characterized in that an inner insulating sleeve is provided on the outer side of the connecting body, and a plurality of tubular metal sub-poles are provided on the outer side of the inner insulating sleeve, and two adjacent ones are provided. There is an insulation layer between the sub-poles. All the outer sides of the sub-poles are wrapped with an outer insulation sleeve. The inner cavity of the inner insulation sleeve is provided with a cable. The sub-poles are electrically connected to the capacitor transmitter through the cable.

2. The multi-phase material level sensor according to claim 1, wherein a module is provided in the inner cavity of the connection body.

3. The multi-phase level sensor according to claim 2, characterized in that the module is composed of a plurality of analog switches and a shift register, and a data output terminal of the shift and register and a strobe terminal of the plurality of analog switches are electrically connected. The output ends of the multi-channel analog switches are respectively electrically connected to a plurality of poles adjacent to each other, and the control ends of the shift register are electrically connected to the cable lines through wires.

4. The multi-phase level sensor according to claim 2, characterized in that the module is electrically connected to each other by a multi-channel analog switch and a decoder, and a data output end of the decoder is electrically connected to the gating control of the multi-channel analog switch. Terminal, the output terminal of the multi-channel analog switch is respectively connected to adjacent multiple sub-poles, and the control terminal of the decoder is electrically connected to the cable through a wire.

5. The multi-phase level sensor according to claim 1, characterized in that the split poles are electrically connected to a cable line through a wire.

6. The multi-phase material level sensor according to claim 1 or 2, characterized in that the connecting body is a steel pipe.

7. The multi-phase material level sensor according to claim 1 or 2, characterized in that the connecting body is a steel cable, the inner insulation sleeve is composed of a plurality of serially connected inner insulation tubes, and two ends of the inner insulation tube are provided with mortars. The head and the mortar bowl, the ends of the two adjacent inner insulation tubes adopt a mortar head and a mortar bowl type structure. The mortar head and the mortar bowl are respectively processed with cable holes and steel cable holes, and several steel cables are insulated inside. The inner cavity of the pipe passes through the steel cable hole to connect the sections of insulated pipes in series.