A method and device for detecting high water cut of crude oil

Abstract

The application discloses a kind of crude oil high water content detection method and device, it is related to crude oil detection technical field.The crude oil high water content detection device, including flowmeter outlet valve, separator oil outlet valve and gear pump inlet valve, gear pump, gear pump outlet valve, the side of flowmeter outlet valve is connected with auxiliary heating device, the side of auxiliary heating device is provided with stirring device, the side of stirring device is provided with water content detection device.The water content detection of crude oil is carried out in the device, not only has stronger anti-interference ability, but also further improves the measurement accuracy of high water content crude oil water content;Compared with the existing measurement mode, the application adopts the idea of concentration migration, and adds the oil of fixed volume separated into the process of water content detection, so that the measurement accuracy of crude oil water content detected by water content detection device is higher, and is suitable for each wellhead.

Description

Technical Field

[0001] This invention relates to the field of crude oil testing technology, and in particular to a method and apparatus for detecting high water content in crude oil. Background Technology

[0002] Water content measurement technology for high-water-cut crude oil plays a crucial role in crude oil extraction, processing, storage, transportation, and refining. The research and application of online water content detection technology for high-water-cut crude oil have also received increasing attention. Its measurement is influenced by multiple factors, including the oil-water two-phase flow regime, temperature, salinity, and nonlinear characteristics. Therefore, researching methods for measuring the water content of high-water-cut crude oil is of great significance for oilfield development.

[0003] Real-time detection of water cut at the wellhead is challenging. Existing methods for detecting high water cut in crude oil are inaccurate, time-consuming, labor-intensive, and fail to meet real-time requirements. With the increasing modernization of oilfields, new demands are being placed on the detection of high water cut in crude oil. Real-time and accurate detection of high water cut in crude oil is crucial for ensuring oil quality and significantly impacts crude oil production and oilfield development. Therefore, we propose a method and apparatus for detecting high water cut in crude oil to address the problems described in the background. Summary of the Invention

[0004] The purpose of this invention is to provide a method and apparatus for detecting high water content in crude oil, which solves the technical problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a crude oil high water content detection device, comprising a flow meter outlet valve, a separator oil outlet valve, a gear pump inlet valve, a gear pump, and a gear pump outlet valve. An auxiliary heating device is connected to one side of the flow meter outlet valve, a stirring device is provided on one side of the auxiliary heating device, a water content detection device is provided on one side of the stirring device, and a stirring device outlet valve for connecting to the crude oil inlet is provided on one side of the water content detection device.

[0006] The moisture content detection device includes an external protective cavity, a PEEK material inner cavity, a circuit board, and a capacitor compartment. The PEEK material inner cavity is provided with an external protective cavity, and the inner wall of the PEEK material inner cavity is provided with a circuit board and a capacitor compartment. The temperature detection probe is placed inside the chamber.

[0007] The moisture content detection device is provided on the side away from the outlet valve of the stirring device, which is equipped with a separator inlet valve for connecting to the crude oil outlet, and an oil-water separator, a separator water outlet valve and a separator oil outlet valve connected to the separator inlet valve; the separator oil outlet valve is connected to the gear pump inlet valve, the gear pump and the gear pump outlet valve, and one end of the auxiliary heating device is connected to the flow meter outlet valve and the gear pump outlet valve, and the other end is connected to the stirring device.

[0008] Preferably, the crude oil inlet and outlet are respectively connected to a crude oil inlet valve pipeline equipped with a solenoid valve and a crude oil outlet valve pipeline equipped with a solenoid valve, as well as a stirring device connected to the crude oil inlet valve pipeline and an oil-water separator connected to the crude oil outlet valve pipeline, and both the stirring device and the oil-water separator are equipped with solenoid valves.

[0009] Preferably, the oil-water separator is connected to the separator outlet valve and the separator oil outlet valve respectively. A portion of the separated oil is sucked in by a gear pump and used to add to the stirring device and mix with the crude oil.

[0010] Preferably, an interface for a data transmission line is provided on the external protective cavity. The data transmission line is used to connect the circuit board and capacitor compartment to the host computer. The host computer obtains the data collected by the moisture content detection device by sending commands in a loop. The data transmission line adopts an RS-485 communication circuit.

[0011] Preferably, the outer protective cavity 6 uses L80 oil pipe steel as the protective shell material, and the top of the inner cavity 7 made of PEEK material is provided with an interface for installing circuit boards and capacitor compartments. The circuit boards and capacitor compartments are installed into the inner cavity through the top of the inner cavity, and the circuit boards and capacitor compartments are symmetrically installed on the inner wall of the inner cavity.

[0012] Preferably, the moisture content detection device 5 further includes a channel selection circuit connected to one end of the capacitive sensor group circuit. The capacitive sensor group circuit includes at least a capacitive sensor group. The capacitive sensor group performs crude oil electrical parameter detection in response to the channel selection circuit. The other end of the capacitive sensor group circuit is connected to an A / D conversion circuit and a main control circuit in sequence. The other end of the main control circuit sends information to a host computer. The host computer is also provided with two interfaces, including an RS485 interface for communication with the detection device and a power supply interface.

[0013] Preferably, the capacitive sensor group circuit includes 50 pairs of capacitor plates with a size of 40mm×10mm, and each capacitor plate is installed sequentially in the circuit board and capacitor compartment 8 at 10mm intervals.

[0014] A detection method for a crude oil high water content detection device includes the following steps:

[0015] S1. After auxiliary heating and metering detection, the crude oil at the wellhead enters the stirring device (3).

[0016] S2. A fixed volume of oil and crude oil are mixed by a stirring device (3) to reduce the water content of the crude oil.

[0017] S3. After stirring, the crude oil passes through the water content detection device. The circuit board and capacitor compartment (8) are installed on the inner wall of the cavity. Each channel of each capacitor chip is selected one by one by the group selection method. The electrical parameters of the liquid in the tank are detected and sent to the host computer through the RS485 communication circuit. The low water content in the tank is calculated by establishing a mathematical model between the electrical parameters and the water content. The crude oil volume is then subtracted to obtain the corresponding high water content.

[0018] S4. The measured crude oil is separated into oil and water by an oil-water separator (10). The fixed volume of oil separated is recycled and added to a stirring device (3) for the next crude oil water content test. The remaining oil is then discharged.

[0019] By employing the concept of concentration migration, a fixed volume of separated oil is added to the water content detection process, resulting in higher accuracy of crude oil water content measurement by the water content detection device, and making it applicable to various wellheads.

[0020] Compared with related technologies, the crude oil high water content detection method and apparatus provided by the present invention have the following beneficial effects:

[0021] 1. This invention provides a method and apparatus for detecting high water content in crude oil, comprising an auxiliary heating device, an external protective cavity, and a circuit board and capacitor compartment mounted on the inner wall of the PEEK material cavity. These components are used to measure the electrical parameters of the components within the tank. A mathematical model is established between the electrical parameters and the water content to calculate the low water content within the tank. The corresponding high water content is then obtained by subtracting the crude oil volume from this model. The measured crude oil is then separated from the water using an oil-water separator. A fixed volume of oil is recycled and added to a stirring device for further crude oil water content detection. Simultaneously, a valve pipeline connecting the stirring device and the separation device is located at the bottom of the PEEK material cavity. A parameter detection device is also installed within the PEEK material cavity. A host computer communicates with both the parameter detection device and the circuit board. Using this apparatus for detecting high water content in crude oil not only provides strong anti-interference capabilities but also further improves the measurement accuracy of high water content crude oil.

[0022] 2. This invention provides a method and apparatus for detecting high water content in crude oil. Compared with existing measurement methods, this invention adopts the concept of concentration migration, adding a fixed volume of separated oil to the water content detection process, which makes the measurement accuracy of crude oil water content detected by the water content detection device higher, and is applicable to various wellheads. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the crude oil high water content detection device of the present invention;

[0024] Figure 2 This is an electrical schematic diagram of the detection device described in this invention.

[0025] In the diagram: 1. Flow meter outlet valve; 2. Auxiliary heating device; 3. Stirring device; 4. Stirring device outlet valve; 5. Moisture content detection device; 6. External protective cavity; 7. PEEK material inner cavity; 8. Circuit board and capacitor compartment; 9. Separator inlet valve; 10. Oil-water separator; 11. Separator water outlet valve; 12. Separator oil outlet valve; 13. Gear pump inlet valve; 14. Gear pump; 15. Gear pump outlet valve. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0027] Example:

[0028] Please see Figure 1 The present invention provides a technical solution: a method and apparatus for detecting high water content in crude oil, comprising a flow meter outlet valve 1, a separator oil outlet valve 12, a gear pump inlet valve 13, a gear pump 14, and a gear pump outlet valve 15. An auxiliary heating device 2 is connected to one side of the flow meter outlet valve 1, a stirring device 3 is provided on one side of the auxiliary heating device 2, and a water content detection device 5 is provided on one side of the stirring device 3. An outlet valve 4 of the stirring device is provided on one side of the water content detection device 5 for connecting to the crude oil inlet.

[0029] The moisture content detection device 5 includes an external protective cavity 6, a PEEK material inner cavity 7, a circuit board and a capacitor compartment 8. The PEEK material inner cavity 7 is provided with an external protective cavity 6, and the PEEK material inner cavity 7 is provided with a circuit board and a capacitor compartment 8 on its inner wall. The temperature detection probe is placed inside the chamber.

[0030] The moisture content detection device 5 is provided with a separator inlet valve 9 for connecting to the crude oil outlet on the side away from the outlet valve 4 of the stirring device, and an oil-water separator 10, a separator water outlet valve 11 and a separator oil outlet valve 12 connected to the separator inlet valve 9; the separator oil outlet valve 12 is connected to the gear pump inlet valve 13, the gear pump 14 and the gear pump outlet valve 15, and one end of the auxiliary heating device 2 is connected to the flow meter outlet valve 1 and the gear pump outlet valve 15, and the other end is connected to the stirring device 3.

[0031] The crude oil inlet and outlet are respectively connected to a crude oil inlet valve pipeline with a solenoid valve and a crude oil outlet valve pipeline with a solenoid valve, as well as a stirring device 3 connected to the crude oil inlet valve pipeline and an oil-water separator 10 connected to the crude oil outlet valve pipeline. Solenoid valves are installed in both the stirring device 3 and the oil-water separator 10.

[0032] The oil-water separator 10 is connected to the separator outlet valve 11 and the separator oil outlet valve 12 respectively. A portion of the separated oil is sucked in by the gear pump 14 and used to add to the stirring device 3 to mix with the crude oil.

[0033] The outer protective cavity 6 has an interface for data transmission lines to pass through. The data transmission lines are used to connect the circuit board and capacitor compartment to the host computer. The host computer obtains the data collected by the moisture content detection device 5 by sending commands in a loop. The data transmission lines use RS-485 communication circuits.

[0034] like Figure 2 As shown, the hardware circuit system of the moisture content detection device consists of a capacitive sensor group circuit, an A / D conversion circuit, a main control circuit connected to the A / D conversion circuit, a channel selection circuit, and a power supply circuit. The circuit descriptions of each part are as follows:

[0035] (1) Main control circuit: The main control circuit uses the TI MSP430F5438 microcontroller as the main control chip. The chip is mainly responsible for scheduling the entire system tasks and acquiring signals. The signals transmitted by the chip are acquired by the microcontroller through the A / D conversion circuit for analysis and processing.

[0036] (2) The programmable capacitor analog-to-digital converter chip AD7142 is selected for the capacitor sensor group circuit. This chip has 14 capacitor sensor input channels. The detection device only uses the first 8 groups. The chip has a resolution better than 1fF and is connected to 8 receiving plates, which work in sequence.

[0037] (3) Channel selection circuit: The channel selection circuit uses the CD4051B chip to control the selection of each group of chips in a time-division manner, and transmits pulses to the eight transmitting plates in sequence. After the signal is attenuated by the medium, it reaches the receiving plate. The receiving plate inputs the collected analog signal to the analog-to-digital converter chip AD7142. The chip performs digital conversion and converts it into a quantizable digital signal, which is stored in the register corresponding to each receiving plate. Then, the data transmission is completed between the microcontroller and the microcontroller through IIC communication.

[0038] (4) Power supply circuit: The power supply circuit is mainly used to supply power to the main control circuit, capacitor sensor group circuit, signal conditioning circuit, etc., and the detection host supplies power to the circuit board.

[0039] The outer protective cavity 6 uses L80 oil pipe steel as the protective shell material, and the PEEK material inner cavity 7 has an interface for installing circuit boards and capacitor compartments at the top. The circuit boards and capacitor compartments are installed into the inner cavity through the top of the inner cavity, and the circuit boards and capacitor compartments are symmetrically installed on the inner wall of the inner cavity.

[0040] In this embodiment, the external protective cavity 6 is used to prevent damage to the tank from the external environment. Since the wellhead pressure is 1.6MPa~10MPa, the water content detection device needs to operate stably under this pressure environment. L80 tubing steel is preferably used as its protective shell. The PEEK material inner cavity 7 is selected to be of high pressure resistant specification and has uniform material density.

[0041] The moisture content detection device 5 also includes a channel selection circuit connected to one end of the capacitive sensor group circuit. The capacitive sensor group circuit includes at least a capacitive sensor group. The capacitive sensor group performs crude oil electrical parameter detection in response to the channel selection circuit. The other end of the capacitive sensor group circuit is connected to an A / D conversion circuit and a main control circuit in sequence. The other end of the main control circuit sends information to the host computer. The host computer is also equipped with two interfaces, including an RS485 interface for communication with the detection device and a power supply interface.

[0042] The capacitive sensor circuit includes 50 pairs of capacitor plates with a size of 40mm×10mm. Each capacitor plate is installed sequentially in the circuit board and capacitor compartment 8 at 10mm intervals.

[0043] A detection method for a crude oil high water content detection device includes the following steps:

[0044] S1. After auxiliary heating and metering, the crude oil from the wellhead enters the stirring device 3;

[0045] S2. A fixed volume of oil and crude oil are mixed by stirring device 3, thereby reducing the water content of crude oil;

[0046] S3. After stirring, the crude oil passes through a water content detection device. The circuit board and capacitor compartment 8 are installed on the inner wall of the cavity. Each channel of each capacitor chip is selected one by one by group selection method. By detecting the electrical parameters of the liquid in the tank, the measured electrical parameters are sent to the host computer through RS485 communication circuit. The low water content in the tank is calculated by establishing a mathematical model between electrical parameters and water content. Then, the crude oil volume is subtracted to obtain the corresponding high water content.

[0047] S4. The measured crude oil is separated into oil and water by oil-water separator 10. The fixed volume of oil separated is recycled and added to stirring device 3 for the next crude oil water content test. The remaining oil is discharged.

[0048] In this implementation plan, the concentration migration concept is adopted. After auxiliary heating and metering, the crude oil at the wellhead enters the stirring device. At this point, oil-water separation is used to obtain a fixed volume of oil, thereby reducing the water content of the crude oil. Then, a mathematical model under low water content is used to detect the water content, calculate the low water content value, and then calculate the actual high water content value based on mathematical relationships. After the water content detection is completed, the added oil is separated for recycling, and the remaining oil is discharged.

[0049] Specifically, assuming the volume of water during detection is V1, the volume of crude oil discharged from the flow meter is V2, the volume of a fixed volume of oil added during concentration migration is V3, and the low water content detected after concentration migration is... The actual high moisture content value is When performing high moisture content testing, a fixed volume of oil is added to reduce the moisture content. The low moisture content value is then measured using a moisture content detection device. Since the volume of oil added (V3) and the volume of crude oil discharged from the flow meter (V2) during concentration migration are constants, the volume of water during detection can be calculated. After obtaining the volume V1 of water during the test, subtract the volume V3 added during concentration migration to calculate the actual high water content value. .

[0050] The outlet valve of the stirring device is connected to the inlet valve of the detection device equipped with a first solenoid valve, and the inlet valve of the separation device is connected to the outlet valve of the detection device equipped with a second solenoid valve. A third solenoid valve is also installed on the crude oil pipeline. During detection, the first solenoid valve is opened, and the second and third solenoid valves are closed. The crude oil flows through the pipeline, first passing through the crude oil heating device for heating, and then through the stirring device before entering the inner cavity of the PEEK material. The crude oil heating device uses electric heating. After the water content detection device detects the presence of an oil-water mixture in the tank, it measures the electrical parameters of the mixture, and the temperature of the inner cavity of the PEEK material changes accordingly. The detection device sequentially selects each group of units according to the channel selection circuit, and transmits the data measured by the capacitance measurement chip to the microcontroller for data storage via the IIC bus. After sequentially selecting each group of capacitance measurement chips, the circuit board packages the data and sends it to the host computer. The host computer stores the measured data and displays it.

[0051] The power supply section uses a DC24V power supply and includes a two-stage voltage regulation circuit. The first-stage step-down circuit uses a UTC78D05AL voltage regulator chip to convert DC24V to DC5V. The second-stage step-down regulation circuit uses an AMS1117 to convert DC5V to DC3.3V for use by subsequent circuits. The first-stage voltage regulation circuit uses a Zener diode in series with a resistor, and the purpose of the series resistor is to limit the current.

Claims

1. A crude oil high water content detection device, comprising a flow meter outlet valve (1), a separator oil outlet valve (12), a gear pump inlet valve (13), a gear pump (14), and a gear pump outlet valve (15), characterized in that: An auxiliary heating device (2) is connected to one side of the flow meter outlet valve (1), a stirring device (3) is provided on one side of the auxiliary heating device (2), a moisture content detection device (5) is provided on one side of the stirring device (3), and a stirring device outlet valve (4) for connecting to the crude oil inlet is provided on one side of the moisture content detection device (5). The moisture content detection device (5) includes an external protective cavity (6), a PEEK material inner cavity (7), a circuit board and a capacitor compartment (8). The PEEK material inner cavity (7) is provided with an external protective cavity (6), and the PEEK material inner cavity (7) is provided with a circuit board and a capacitor compartment (8) on its inner wall. The temperature detection probe is placed inside the chamber. The moisture content detection device (5) is provided with a separator inlet valve (9) for connecting crude oil outlet on the side away from the stirring device outlet valve (4), and an oil-water separator (10), a separator water outlet valve (11) and a separator oil outlet valve (12) connected to the separator inlet valve (9); the separator oil outlet valve (12) is connected to the gear pump inlet valve (13), the gear pump (14) and the gear pump outlet valve (15); one end of the auxiliary heating device (2) is connected to the flow meter outlet valve (1) and the gear pump outlet valve (15), and the other end is connected to the stirring device (3); During testing, the measured crude oil is separated into oil and water by an oil-water separator (10). The separated fixed volume of oil is recycled and reused. The fixed volume of oil is mixed with the crude oil by a stirring device (3), thereby reducing the water content of the crude oil.

2. The crude oil high water content detection device according to claim 1, characterized in that: The crude oil inlet and outlet are respectively connected to a crude oil inlet valve pipeline with a solenoid valve and a crude oil outlet valve pipeline with a solenoid valve, as well as a stirring device (3) connected to the crude oil inlet valve pipeline and an oil-water separator (10) connected to the crude oil outlet valve pipeline. Solenoid valves are provided in both the stirring device (3) and the oil-water separator (10).

3. The crude oil high water content detection device according to claim 1, characterized in that: The oil-water separator (10) is connected to the separator outlet valve (11) and the separator oil outlet valve (12) respectively. A portion of the separated oil is sucked in by the gear pump (14) and used to add to the stirring device (3) and mix with the crude oil.

4. The crude oil high water content detection device according to claim 1, characterized in that: An interface for a data transmission line to pass through is provided on the external protective cavity (6). The data transmission line is used to connect the circuit board and capacitor compartment to the host computer. The host computer obtains the data collected by the moisture content detection device (5) by sending instructions in a loop. The data transmission line adopts an RS-485 communication circuit.

5. The crude oil high water content detection device according to claim 1, characterized in that: The external protective cavity (6) uses L80 oil pipe steel as the protective shell material. The PEEK material inner cavity (7) has an interface for installing circuit boards and capacitor compartments at the top. The circuit boards and capacitor compartments are installed into the inner cavity through the top of the inner cavity. The circuit boards and capacitor compartments are symmetrically installed on the inner wall of the inner cavity.

6. The crude oil high water content detection device according to claim 1, characterized in that: The moisture content detection device (5) further includes a channel selection circuit connected to one end of the capacitive sensor group circuit. The capacitive sensor group circuit includes at least a capacitive sensor group. The capacitive sensor group responds to the channel selection circuit to detect crude oil electrical parameters. The other end of the capacitive sensor group circuit is connected to an A / D conversion circuit and a main control circuit in sequence. The other end of the main control circuit sends information to the host computer.

7. The crude oil high water content detection device according to claim 6, characterized in that: The host computer is also equipped with two interfaces, including an RS485 interface for communicating with the detection device and a power supply interface.

8. The crude oil high water content detection device according to claim 6, characterized in that: The capacitive sensor group circuit includes 50 pairs of capacitor plates with a size of 40mm×10mm. Each of the capacitor plates is installed sequentially in the circuit board and capacitor compartment (8) at 10mm intervals.

9. A detection method for a crude oil high water content detection device according to any one of claims 1-8, characterized in that: Includes the following steps: S1. After auxiliary heating and metering detection, the crude oil at the wellhead enters the stirring device (3). S2. A fixed volume of oil and crude oil are mixed by a stirring device (3) to reduce the water content of the crude oil. S3. After stirring, the crude oil passes through the water content detection device. The circuit board and capacitor compartment (8) are installed on the inner wall of the cavity. Each channel of each capacitor chip is selected one by one by the group selection method. The electrical parameters of the liquid in the tank are detected and sent to the host computer through the RS485 communication circuit. The low water content in the tank is calculated by establishing a mathematical model between the electrical parameters and the water content. The crude oil volume is then subtracted to obtain the corresponding high water content. S4. The measured crude oil is separated into oil and water by an oil-water separator (10). The fixed volume of oil separated is recycled and added to a stirring device (3) for the next crude oil water content test. The remaining oil is then discharged. By adopting the concept of concentration migration, a fixed volume of separated oil is added to the water content detection process, which makes the measurement accuracy of crude oil water content by the water content detection device higher, and it is applicable to various wellheads. Assuming the volume of water during detection is V1, the volume of crude oil discharged from the flow meter is V2, and the volume of a fixed volume of oil added during concentration migration is V3, the low water content detected after concentration migration is... The actual high moisture content value is When performing high moisture content testing, a fixed volume of oil is added to reduce the moisture content. The low moisture content value is then measured using a moisture content detection device. Since the volume of oil added (V3) and the volume of crude oil discharged from the flow meter (V2) during concentration migration are constants, the volume of water during detection can be calculated. After obtaining the volume V1 of water during the test, subtract the volume V3 added during concentration migration to calculate the actual high water content value. .

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