Device for detecting ratio of oil to water in thickened oil storage tank

Abstract

The utility model discloses a device for detecting the proportion of oil and water in a thickened oil storage tank, which is characterized by comprising an explosion-proof box arranged on a test port of the oil storage tank, a servo motor with a gearbox arranged in the explosion-proof box, and a steel wire roller matched with the servo motor, the running steel wire is wound on the steel wire roller, a balancing weight is arranged at the free end of the running steel wire, a sensor is arranged below the balancing weight, and the sensor is connected with a microwave demodulator in the explosion-proof box through a coaxial cable. By arranging the microwave detector, the water content ratio of crude oil in the storage tank is directly tested, so that the problems of high labor intensity and low efficiency of manual sampling and testing on the tank are fundamentally solved, the problem of potential safety hazards in production is effectively solved, and meanwhile, the detection accuracy and the detection precision of an oil-water interface and the water content ratio of the crude oil are also improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of crude oil detection, and particularly relates to an oil-water ratio detection device in a heavy oil storage tank. Background Art

[0002] Heavy oil, also known as heavy oil abroad, is a viscous black liquid that does not flow at room temperature.

[0003] The crude oil produced in the oil field first enters the primary settling tank. The water content of the crude oil from the production well is 50%-95%. After the water content is settled to 30% in the primary settling tank, it is introduced into the secondary settling tank and the settling water is discharged. After the crude oil enters the secondary settling tank, demulsifier is added for dehydration and sedimentation. The water content of the crude oil is ≤3% to meet the external transmission requirements and enter the external transmission crude oil storage tank. During the production process, it is necessary to take samples from the tank, take crude oil at different heights in the tank, test the water content of the crude oil to find the oil-water interface, and determine the drainage height and the water content of the crude oil.

[0004] At present, there are two methods for measuring the water content of mixed liquids at home and abroad: 1. Capacitance method and 2. Inductance method. Both methods distinguish the ratio of oil and water by measuring the conductivity of the sensor surface in the liquid. This sensing technology is not suitable for the detection of water content in heavy crude oil, especially for the detection of heavy oil. Because the sensor surface is stained with heavy oil and placed in water, the conductivity of the oil is still the same, especially the water-in-oil phenomenon of heavy oil, which makes the sensor unable to measure the water content in the crude oil.

[0005] At the same time, when sampling with the existing method, it is necessary to lower a steel wire with a sampling barrel from the sampling opening on the top of the oil storage tank through a fixed pulley, use a hand winch to lower the sampling barrel to a pre-sampling depth in the tank through a winch counter, control the steel wire through the sampling barrel to open the sampling barrel, and after sampling, control the steel wire through the sampling barrel to close the sampling barrel, and use a hand winch fixed on the tank top to lift the sampling barrel out of the oil tank, completing the oil and water liquid sampling work at a certain depth designed in the tank. A sedimentation tank must complete at least 3 samplings at different depths to find out the height of the oil-water interface in the tank and the oil-water ratio at different heights.

[0006] In the existing method, frequent manual sampling is required, which is labor-intensive and inefficient. Especially in winter, the tank ladder and the tank top are slippery, which poses a great safety hazard to production. Utility Model Content

[0007] The purpose of the utility model is to provide an oil-water ratio detection device in a heavy oil storage tank, which can automatically perform fixed-point detection in the heavy oil storage tank to obtain the corresponding oil-water ratio, thereby solving the problems in the prior art.

[0008] In view of the current problem of manual tank sampling and testing to find out the oil-water interface and the oil-water ratio, the utility model studies an oil-water ratio detection device in a heavy oil storage tank, which can automatically detect the oil-water ratio in the storage tank and solve the problem of manual tank sampling and testing of the water content of crude oil.

[0009] To achieve the above-mentioned purpose, the technical solution of the utility model is: an oil-water ratio detection device in a heavy oil storage tank, characterized in that it includes an explosion-proof box arranged on a test port of the oil storage tank, a servo motor with a gearbox and a wire drum matched with the servo motor are arranged in the explosion-proof box, a running steel wire is wound around the wire drum and a counterweight is arranged at the free end, a sensor is arranged below the counterweight, and the sensor is connected to a microwave demodulator in the explosion-proof box through a coaxial cable.

[0010] Furthermore: it also includes a control module, which cooperates with the servo motor to control the start and stop of the servo motor.

[0011] Furthermore: it also includes a remote communication module, which is connected to the control module and / or the microwave demodulator.

[0012] Furthermore: the remote communication module is arranged outside the explosion-proof box and is connected to the main control room for communication.

[0013] Furthermore: an exhaust port is arranged on the top of the oil storage tank; and an in-tank heating circulation pipe is arranged inside the oil storage tank.

[0014] Furthermore: the sensor includes a transmitting end and a receiving end, the transmitting end and the receiving end are respectively fixed under the counterweight block through a bracket and are respectively connected to the microwave demodulator through a coaxial cable.

[0015] The beneficial effects of the utility model are as follows: the utility model directly tests the water content of crude oil in the storage tank by setting a microwave detector, fundamentally solving the problem of high labor intensity and low efficiency of manual tank sampling and testing, effectively solving the potential safety hazard problem in production, and at the same time improving the detection accuracy and precision of the oil-water interface and the water content of crude oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0017] Figure 2 It is an enlarged schematic diagram of part of the structure of the utility model.

[0018] Figure 3 It is a schematic diagram of electrical connection of the control part in the utility model.

[0019] Explanation of the serial numbers in the figure: 1—explosion-proof box; 2—control module; 3—servo motor; 4—gearbox; 5—wire drum; 6—microwave demodulator; 7—running wire; 8—counterweight; 9—sensor; 10—coaxial cable; 11—remote communication module; 12—oil storage tank; 13—test port; 14—exhaust port; 15—tank heating circulation pipe; 16—flange. DETAILED DESCRIPTION

[0020] like Figure 1-3 As shown, the utility model discloses an oil-water ratio detection device in a heavy oil storage tank, comprising an explosion-proof box 1 arranged on a test port 13 of an oil storage tank 12, a servo motor 3 with a gearbox 4, and a wire drum 5 matched with the servo motor 3 are arranged in the explosion-proof box 1, a running steel wire 7 is wound around the wire drum 5 and a counterweight 8 is arranged at the free end, a sensor 9 is arranged below the counterweight 8, and the sensor 9 is connected to a microwave demodulator 6 in the explosion-proof box 1 through a coaxial cable 10.

[0021] Preferably, it also includes a control module 2, which cooperates with the servo motor 3 to control the start and stop of the servo motor 3, thereby realizing the retraction and extension of the running steel wire.

[0022] Preferably, it further comprises a remote communication module 11 , which is connected to the control module 2 and / or the microwave demodulator 6 .

[0023] Preferably, the remote communication module 11 is arranged outside the explosion-proof box 1 and is communicatively connected with the main control room.

[0024] Preferably, an exhaust port 14 is provided at the top of the oil storage tank 12 ; and an in-tank heating circulation pipe 15 is provided inside the oil storage tank 12 .

[0025] Preferably: the sensor 9 includes a transmitting end 91 and a receiving end 92, which are respectively fixed to the bottom of the counterweight 8 by a bracket and connected to the microwave demodulator 6 by a coaxial cable 10. The transmitting end is used to transmit microwave signals, and the receiving end is used to receive microwave signals. The microwave spectrum emitted by the transmitting end passes through the detected heavy oil and is received by the receiving end. The received microwave is transmitted to the microwave demodulator via a coaxial cable, and the demodulated data is transmitted to the remote communication module. After the microwave passes through the detected heavy oil, the corresponding phase angle in the microwave will change due to the influence of the medium. The change value of the phase angle is obtained by the microwave demodulator, and compared with the known data, the water content of the heavy oil can be determined.

[0026] The present invention is further described below by way of examples. Example

[0027] A device for detecting the oil-water ratio in a heavy oil storage tank, the heavy oil storage tank comprising an oil storage tank 12, an in-tank heating circulation pipe 15 is arranged inside the oil storage tank 12 or in the inner wall of the tank body, the in-tank heating circulation pipe 15 can be fixed to the inner side of the tank body by a bracket, etc., and multiple groups of in-tank heating circulation pipes 15 are arranged at intervals. An exhaust port 14 is arranged at the top of the oil storage tank 12 for exhausting gas and balancing the internal and external air pressures, and one or more test ports 13 are also arranged at the top of the oil storage tank 12, and a flange 16 is integrally arranged on the test port 13.

[0028] The oil-water ratio detection device includes an explosion-proof box 1 for accommodating various components. The explosion-proof box is a standard part that meets the relevant safety standards of the oil field. A bottom plate is fixedly arranged below the explosion-proof box, and the bottom plate is fixedly connected to the flange bolts. A servo motor 3 is arranged in the explosion-proof box, and the servo motor is fixed in the explosion-proof box through a bracket or a base. A gearbox is arranged in front of the servo motor. The wire drum is connected to the output shaft of the gearbox through a coupling. The wire drum is rotatably arranged on the drum seat, and the drum seat is fixed to the explosion-proof box by bolts. A running steel wire is wound around the steel wire drum, and the free end of the running steel wire passes through the opening at the bottom of the explosion-proof box and the test port and extends into the thick oil in the oil storage tank. A counterweight block is suspended below the running steel wire, and the counterweight block can ensure the vertical state of the lower end of the running steel wire. The sensor is fixed under the counterweight by a bracket. Specifically, the sensor includes a receiving end and a transmitting end. The bracket is an inverted U-shaped frame. The receiving end and the transmitting end are respectively fixed on one side of the U-shaped frame and arranged oppositely. The bottom of the U-shaped frame (the top after inversion) is fixed to the counterweight by bolts. The receiving end and the transmitting end are respectively matched with the microwave demodulator through coaxial cables.

[0029] Also includes control units, such as Figure 3 As shown, the control unit includes a control module 2, which is electrically connected to the servo motor and the microwave demodulator, respectively, and is used to control the start, stop and direction rotation of the servo motor, and the microwave demodulator to transmit and receive microwaves. It also includes a remote communication module, which is electrically connected to the control module and / or the microwave demodulator, and is connected to the main control system in the control room.

[0030] The electrical connection includes electrical connection and / or signal connection.

[0031] The working process of the utility model structure is as follows: according to the designed detection time, the servo motor in the explosion-proof box on the control tank controls the wire drum to run at a uniform speed through the reduction box, and the wire drum controls the sensor to move at a uniform speed of 60cm / min from the top of the tank to the bottom of the tank. In this process, the microwave demodulator detects microwave radiation through the coaxial cable and the sensor. After the detection parameters are demodulated and calculated by the microwave demodulator, they are wirelessly transmitted to the main control system in the duty room through the remote communication module. The online detection data of different water contents of crude oil at different heights in the oil storage tank can be observed in the duty room.

[0032] It should be noted that: in this solution, the control module, the remote communication module, etc. are all prior art. Other structures, connection relationships and detection principles not described in detail are all prior art.

[0033] The utility model uses microwave technology to detect the spectrum of different water contents in heavy oil and phase demodulation to calculate the different water contents of heavy oil. The spectrum of water content in crude oil in the range of the sensor is detected by microwave radiation, and the water content ratio of crude oil is accurately calculated. The equipment realizes automatic detection according to the set time, and the detection data can be viewed online in real time in the duty room. The oil layer thickness, oil-water interface, and water layer thickness can be directly seen through the crude oil water content ratio detection curve. The application of the utility model can solve the problem of manual tank sampling and testing, effectively solve the safety hazard problem in production, improve the detection accuracy and precision of the oil-water interface and the crude oil water content ratio, and provide important technical support for the intelligent digital management of oilfield joint stations.

Claims

1. A device for detecting the oil-water ratio in a heavy oil storage tank, characterized in that: The invention comprises an explosion-proof box (1) arranged on a test port (13) of an oil storage tank (12), a servo motor (3) with a gearbox (4) and a wire drum (5) matched with the servo motor (3) arranged in the explosion-proof box (1), a running wire (7) wound around the wire drum (5) and a counterweight (8) arranged at the free end, a sensor (9) arranged below the counterweight (8), and the sensor (9) connected to a microwave demodulator (6) in the explosion-proof box (1) via a coaxial cable (10).

2. The oil-water ratio detection device in a heavy oil storage tank according to claim 1, characterized in that: It also includes a control module (2), which cooperates with the servo motor (3) to control the start and stop of the servo motor (3).

3. The oil-water ratio detection device in a heavy oil storage tank according to claim 1, characterized in that: It also includes a remote communication module (11), which is connected to the control module (2) and / or the microwave demodulator (6).

4. The oil-water ratio detection device in a heavy oil storage tank according to claim 3 is characterized in that: The remote communication module (11) is arranged outside the explosion-proof box (1) and is communicatively connected to the main control room.

5. The oil-water ratio detection device in a heavy oil storage tank according to claim 1, characterized in that: An exhaust port (14) is provided at the top of the oil storage tank (12); and an in-tank heating circulation pipe (15) is provided inside the oil storage tank (12).

6. The device for detecting the oil-water ratio in a heavy oil storage tank according to claim 1, characterized in that: The sensor (9) comprises a transmitting end (91) and a receiving end (92), wherein the transmitting end (91) and the receiving end (92) are respectively fixed below the counterweight (8) via a bracket and are respectively connected to the microwave demodulator (6) via a coaxial cable (10).

Images