Oil-gas-water three-phase separation metering device

Abstract

The invention discloses an oil-gas-water three-phase separation metering device which comprises a three-phase separator and a metering device. A gas phase metering device; an oil phase metering device; an aqueous phase metering device; a first photoelectric sensing liquid level detector; a second photoelectric sensing liquid level detector; the controller is configured to meter the flow of the gas phase in the exhaust pipeline; determining that the oil phase is detected by the first photoelectric induction liquid level detector; an oil discharge pipeline is conducted, and the flow of the oil phase in the oil discharge pipeline is metered; determining that a water phase is detected by a second photoelectric induction liquid level detector; a drainage pipeline is conducted, and a water phase metering device is controlled to meter the flow of the water phase in the drainage pipeline; and determining the gas phase yield, the oil phase yield and the water phase yield according to the first metering data of the gas phase metering device, the second metering data of the oil phase metering device and the third metering data of the water phase metering device. The oil-gas-water three-phase separation metering device is simple in structure and capable of metering the flow of oil, gas and water three-phase fluid in real time in a large-flow and long-period mode.

Description

Technical Field

[0001] The present application belongs to the field of indoor displacement experiments, and specifically relates to an oil-gas-water three-phase separation and metering device. Background Art

[0002] Physical model displacement experiments are the primary means of evaluating the flow characteristics of oil and gas in formations. Accurately measuring the three-phase flow of oil, gas, and water in the output is crucial for these evaluations. Separate measurement methods rely on measuring the volume and mass of produced oil, gas, and water. Traditional measurement methods are limited by the measuring range of their vessels and are only suitable for small physical core models with low flow rates. Large physical model experiments require long cycles, often requiring continuous monitoring for hundreds of days. Traditional small core oil and water metering devices are unable to meet these high-volume measurement requirements. Summary of the Invention

[0003] The purpose of this application is to provide an oil-gas-water three-phase separation and metering device with a simple structure, which can measure the flow rate of oil, gas and water three-phase fluids in large flow, long period and real time.

[0004] In order to achieve the above objectives, the present application provides an oil-gas-water three-phase separation and metering device, which includes:

[0005] A three-phase separator, wherein the interior of the three-phase separator is formed with a gas phase containing chamber, an oil phase containing chamber, and a water phase containing chamber distributed sequentially from top to bottom, and the gas phase containing chamber is connected to the oil, gas, and water three-phase flow source;

[0006] A gas phase metering device is provided on an exhaust pipe connected to the gas phase containing chamber;

[0007] An oil phase metering device is provided on an oil discharge pipeline connected to the oil phase containing chamber;

[0008] A water phase metering device is provided on a drainage pipe connected to the water phase containing chamber;

[0009] The detection assembly includes a first photoelectric liquid level detector and a second photoelectric liquid level detector, wherein the first photoelectric liquid level detector is disposed at the boundary between the gas phase receiving chamber and the oil phase receiving chamber and is used to detect the oil phase, and the second photoelectric liquid level detector is disposed at the boundary between the oil phase receiving chamber and the water phase receiving chamber and is used to detect the water phase;

[0010] The controller is configured to:

[0011] Control the gas phase metering device to measure the flow of the gas phase in the exhaust pipeline;

[0012] Determining that the first photoelectric sensing liquid level detector detects the oil phase;

[0013] Connect the oil discharge pipeline and control the oil phase metering device to measure the flow of the oil phase in the oil discharge pipeline;

[0014] Determining that the second photoelectric sensing liquid level detector detects the water phase;

[0015] Connecting the drainage pipeline and controlling the water phase metering device to measure the flow of the water phase in the drainage pipeline;

[0016] The gas phase production, oil phase production and water phase production of the oil-gas-water three-phase flow source are determined according to the first metering data of the gas phase metering device, the second metering data of the oil phase metering device and the third metering data of the water phase metering device.

[0017] In an embodiment of the present application, a first cavity, a second cavity, a first connecting channel, a second connecting channel and a third connecting channel are formed inside the three-phase separator. The first cavity includes a first accommodating section, a second accommodating section and a third accommodating section vertically connected in sequence. The second cavity includes a fourth accommodating section, a fifth accommodating section and a sixth accommodating section vertically connected in sequence. The two ends of the first connecting channel are respectively connected to the first accommodating section and the fourth accommodating section. The first accommodating section, the fourth accommodating section and the first connecting channel together constitute a gas phase accommodating chamber. The two ends of the second connecting channel are respectively connected to the second accommodating section and the fifth accommodating section. The second accommodating section, the fifth accommodating section and the second connecting channel together constitute an oil phase accommodating chamber. The two ends of the third connecting channel are respectively connected to the third accommodating section and the sixth accommodating section. The third accommodating section, the sixth accommodating section and the third connecting channel together constitute a water phase accommodating chamber.

[0018] In an embodiment of the present application, the first photoelectric liquid level detector includes a first transmitting end and a first receiving end, the first transmitting end is used to transmit a first light signal, and the first receiving end is used to receive the first light signal and convert the first light signal into a first electrical signal, one of the first transmitting end and the first receiving end is disposed inside the second cavity and at the boundary between the fourth accommodating section and the fifth accommodating section, and the other is disposed outside the second cavity;

[0019] The second photoelectric sensing liquid level detector includes a second transmitting end and a second receiving end, the second transmitting end is used to transmit a second light signal, and the second receiving end is used to receive the second light signal and convert the second light signal into a second electrical signal. One of the second transmitting end and the second receiving end is arranged inside the second cavity and located at the boundary position between the fifth accommodating section and the sixth accommodating section, and the other is arranged outside the second cavity.

[0020] In an embodiment of the present application, determining that the first photoelectric liquid level detector detects the oil phase includes:

[0021] determining that the first receiving end does not receive the first optical signal; and

[0022] Determining that the second photoelectric sensing liquid level detector detects the water phase includes:

[0023] It is determined that the second receiving end receives the second optical signal.

[0024] In an embodiment of the present application, the gas phase metering device includes a first gas phase meter and a second gas phase meter, the first measuring range of the first gas phase meter is smaller than the second measuring range of the second gas phase meter, and controlling the gas phase metering device to measure the flow rate of the gas phase in the exhaust pipeline includes:

[0025] opening the first gas phase meter and closing the second gas phase meter;

[0026] When it is determined that the flow rate of the gas phase reaches a first preset proportion of the first measuring range, the first gas phase meter is turned off and the second gas phase meter is turned on, so that the second gas phase meter measures the flow rate of the gas phase; or

[0027] When it is determined that the flow rate of the gas phase does not reach the first preset proportion of the first range, the first gas phase meter is controlled to be continuously opened and the second gas phase meter is controlled to be continuously closed, so that the first gas phase meter measures the flow rate of the gas phase.

[0028] In an embodiment of the present application, the oil phase metering device includes a first oil phase meter and a second oil phase meter, the third range of the first oil phase meter is smaller than the fourth range of the second oil phase meter, and controlling the oil phase metering device to measure the flow rate of the oil phase in the oil discharge pipeline includes:

[0029] opening the first oil phase meter and closing the second oil phase meter;

[0030] When it is determined that the flow rate of the oil phase reaches the second preset proportion of the third range, the first oil phase meter is closed and the second oil phase meter is opened, so that the second oil phase meter measures the flow rate of the oil phase; or

[0031] When it is determined that the flow rate of the oil phase does not reach the second preset proportion of the third range, the first oil phase meter is controlled to be continuously opened and the second oil phase meter is controlled to be continuously closed, so that the first oil phase meter measures the flow rate of the oil phase.

[0032] In an embodiment of the present application, the oil phase metering device further comprises:

[0033] a holding tank assembly comprising a first holding tank and a second holding tank, both for storing an oil phase;

[0034] a first weight detector, configured to detect the weight of the oil phase in the first holding tank;

[0035] a second weight detector, used for detecting the weight of the oil phase in the second holding tank;

[0036] A selector is formed with an oil inlet, a first oil outlet, and a second oil outlet. The oil inlet is connected to an end of the oil discharge pipeline away from the three-phase separator. The first oil outlet is connected to the first holding tank via a first branch pipe, and the second oil outlet is connected to the second holding tank via a second branch pipe.

[0037] The controller is also configured to:

[0038] Controlling the selector to open the first oil outlet and close the second oil outlet so that the oil phase enters the first holding tank;

[0039] controlling the first weight detector to detect the weight of the oil phase in the first holding tank;

[0040] determining that the weight of the oil phase in the first holding tank reaches a preset weight;

[0041] The control selector closes the first oil outlet and opens the second oil outlet, so that the oil phase enters the second holding tank.

[0042] In an embodiment of the present application, the oil phase metering device includes a first water phase meter and a second water phase meter, the fifth range of the first water phase meter is smaller than the sixth range of the second water phase meter, and controlling the water phase metering device to measure the flow rate of the water phase in the drainage pipeline includes:

[0043] Open the first water phase meter and close the second water phase meter;

[0044] When it is determined that the flow rate of the water phase reaches the third preset ratio of the fifth measuring range, the first water phase meter is turned off and the second water phase meter is turned on, so that the second water phase meter measures the flow rate of the water phase; or

[0045] When it is determined that the flow rate of the water phase does not reach the third preset proportion of the fifth range, the first water phase meter is controlled to be continuously opened and the second water phase meter is controlled to be continuously closed, so that the first water phase meter measures the flow rate of the water phase.

[0046] In an embodiment of the present application, the oil, gas and water three-phase separation and metering device further includes:

[0047] A sealing cover assembly, which is arranged on the top of the first accommodating cavity;

[0048] The lubricant preventer has an upper end inserted in the sealing cover assembly and connected to the oil, gas and water three-phase flow source, and a lower end of the lubricant preventer is in an inverted frustum shape and communicated with the first accommodating section.

[0049] In an embodiment of the present application, the oil-gas-water three-phase separation metering device further includes a constant temperature box arranged outside the three-phase separator and used to prevent the oil phase from solidifying.

[0050] Through the above technical solution, the oil-gas-water three-phase separation and metering device includes: a three-phase separator, the interior of the three-phase separator is formed with a gas phase containing chamber, an oil phase containing chamber and a water phase containing chamber distributed in sequence from top to bottom, and the gas phase containing chamber is connected to the oil-gas-water three-phase flow source; a gas phase metering device is arranged on the exhaust pipe connected to the gas phase containing chamber; an oil phase metering device is arranged on the oil discharge pipe connected to the oil phase containing chamber; a water phase metering device is arranged on the drainage pipe connected to the water phase containing chamber; a detection component includes a first photoelectric sensing liquid level detector and a second photoelectric sensing liquid level detector, the first photoelectric sensing liquid level detector is arranged at the boundary position of the gas phase containing chamber and the oil phase containing chamber and is used to detect the oil phase, and the second photoelectric sensing liquid level detector is arranged at the boundary position of the gas phase containing chamber and the oil phase containing chamber and is used to detect the oil phase, The liquid level detector is arranged at the boundary between the oil phase holding chamber and the water phase holding chamber and is used to detect the water phase. The controller is configured to: control the gas phase metering device to measure the flow of the gas phase in the exhaust pipe; determine that the first photoelectric sensing liquid level detector detects the oil phase; conduct the oil discharge pipe and control the oil phase metering device to measure the flow of the oil phase in the oil discharge pipe; determine that the second photoelectric sensing liquid level detector detects the water phase; conduct the drainage pipe and control the water phase metering device to measure the flow of the water phase in the drainage pipe; and determine the gas phase production, oil phase production, and water phase production of the oil, gas, and water three-phase flow source based on the first metering data of the gas phase metering device, the second metering data of the oil phase metering device, and the third metering data of the water phase metering device. The oil, gas, and water three-phase separation metering device has a simple structure and is easy to control. It can separately measure the flow of the discharged gas phase, oil phase, and water phase. It can measure the flow of the oil, gas, and water three-phase fluid produced by large-scale physical simulation experiments in real time with large flow, long period, and continuous and uninterrupted operation, eliminating errors caused by human factors and improving metering accuracy.

[0051] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without inventive work. In the drawings:

[0053] Figure 1 Schematic diagram of the composition of the oil, gas and water three-phase separation and metering device in an embodiment of the present invention;

[0054] Figure 2 Schematic diagram of the structure of a three-phase separator in an embodiment of the present invention;

[0055] Figure 3 Schematic diagram of the structure of the oil phase metering device in an embodiment of the present invention;

[0056] Figure 4 Schematic diagram of the main process of the oil, gas and water three-phase separation and metering device in an embodiment of the present invention;

[0057] Figure 5 Schematic diagram of the overall process of the oil, gas and water three-phase separation and metering device in an embodiment of the present invention (Example 2).

[0058] Description of Reference Numerals

[0059] 1-Back pressure valve; 2-Back pressure pump; 3-Three-phase separator; 4-First photoelectric liquid level detector; 5-Second photoelectric liquid level detector; 6-Constant temperature box; 7-Oil phase metering device; 8-Water phase metering device; 9-Gas phase metering device; 10-Top cover; 11-Blowout preventer; 12-First cavity; 13-Second cavity; 14-First scale; 15-First connecting channel; 16-Second connecting channel; 17-Oil phase outlet; 18-Water phase outlet; 19-Rubber stopper; 20-First switch valve; 21-Selector; 22-Second support frame; 23-First holding tank; 24-First weight detector. DETAILED DESCRIPTION

[0060] The following describes the specific embodiments of the present application in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present application and are not intended to limit the present application.

[0061] The embodiment of the present application provides an oil-gas-water three-phase separation and metering device, such as Figure 1 As shown, the oil, gas and water three-phase separation and metering device includes:

[0062] The three-phase separator 3 has a gas phase accommodating chamber, an oil phase accommodating chamber, and a water phase accommodating chamber formed therein, which are sequentially distributed from top to bottom. The gas phase accommodating chamber is connected to a three-phase flow source of oil, gas, and water;

[0063] The gas phase metering device 9 is provided on the exhaust pipe connected to the gas phase containing chamber;

[0064] The oil phase metering device 7 is provided on the oil discharge pipeline connected to the oil phase containing chamber;

[0065] A water phase metering device 8 is provided on a drainage pipe connected to the water phase containing chamber;

[0066] The detection assembly includes a first photoelectric liquid level detector 4 and a second photoelectric liquid level detector 5. The first photoelectric liquid level detector 4 is arranged at the boundary between the gas phase receiving chamber and the oil phase receiving chamber and is used to detect the oil phase. The second photoelectric liquid level detector 5 is arranged at the boundary between the oil phase receiving chamber and the water phase receiving chamber and is used to detect the water phase.

[0067] The controller is in communication with the gas phase metering device 9, the oil phase metering device 7, the water phase metering device 8 and the water phase metering device 8 and is configured to perform the following steps, such as Figure 4 As shown:

[0068] Step S101: after determining that the oil-gas-water three-phase separation metering device is in metering mode, controlling the gas phase metering device 9 to measure the flow of the gas phase in the exhaust pipe;

[0069] Step S102: determining whether the first photoelectric liquid level detector 4 detects the oil phase;

[0070] Step S103: connecting the oil discharge pipeline and controlling the oil phase metering device 7 to measure the flow rate of the oil phase in the oil discharge pipeline;

[0071] Step S104: determining whether the second photoelectric liquid level detector 5 detects the water phase;

[0072] Step S105: connecting the drainage pipeline and controlling the water phase metering device 8 to measure the flow of the water phase in the drainage pipeline;

[0073] Step S106: Determine the gas phase production, oil phase production and water phase production of the oil-gas-water three-phase flow source according to the first metering data of the gas phase metering device 9, the second metering data of the oil phase metering device 7 and the third metering data of the water phase metering device 8.

[0074] Specifically, the oil, gas and water three-phase flow source in this embodiment refers to the outlet end of the large-scale physical simulation experiment (i.e., the output well of the large-scale physical simulation experiment). The maximum liquid production rate of the large-scale physical simulation experiment is 100 mL / min, the maximum gas production rate is 10 L / min, and the density of the oil phase is 8.3 g / min. The oil, gas and water three-phase separation metering device also includes an input pipe and a back-pressure valve 1 and a back-pressure pump 2 that are connected to the controller for communication. One end of the input pipe is connected to the wellhead of the output well of the large-scale physical simulation experiment, and the other end of the input pipe is connected to the top of the gas phase containing cavity. The back-pressure valve 1 is arranged on the input pipe and is used to control the wellhead pressure of the output well during the large-scale physical simulation experiment; the back-pressure pump 2 is connected to the control end of the back-pressure valve 1 through a control pipeline to control the back-pressure pressure. The exhaust pipe is connected to the top of the gas phase containing chamber and is located on one side of the input pipe. An oil phase outlet 17 is formed on the side wall of the oil phase containing chamber. Vertically, the oil phase outlet 17 is in the middle position of the three-phase separator 3 and is located between the first photoelectric sensing liquid level detector 4 and the second photoelectric sensing liquid level detector 5; a water phase outlet 18 is formed on the side wall of the water phase containing chamber. Vertically, the water phase outlet 18 is located near the bottom end of the three-phase separator 3, and the second photoelectric sensing liquid level detector 5 is above the water phase outlet 18.

[0075] Furthermore, before executing step S101, the controller further executes the following steps:

[0076] Make sure that the gas phase metering device 9, the oil phase metering device 7 and the water phase metering device 8 are all in the reset state.

[0077] The above steps can prevent the original metering data in the gas phase metering device 9, the oil phase metering device 7 and the water phase metering device 8 from affecting the accuracy of subsequent metering results.

[0078] When the operator presses the operation button, the controller can determine that the oil-gas-water three-phase separation metering device starts the metering mode. Then, the oil-gas-water three-phase fluid produced by the production well of the large-scale physical simulation experiment flows through the input pipe into the interior of the three-phase separator 3. Since its pressure is reduced to atmospheric pressure after passing through the back pressure valve 1, the oil-gas-water three-phase fluid will quickly undergo gas-liquid separation. After the separated gas phase enters the three-phase separator 3 (the three-phase separator 3 is made of transparent glass), its volume expands rapidly and moves upward, and then it is discharged to the outside through the exhaust pipe. The gas phase metering device 9 will measure the flow rate of the gas phase flowing through it and obtain first metering data, and the gas phase metering device 9 will then send the first metering data to the controller;

[0079] The liquid after gas-liquid separation is mainly a mixture of oil phase and water phase. Since the density of the oil phase is less than that of the water phase, the mixture is further separated rapidly under the action of gravity after entering the three-phase separator 3, and the water phase and oil phase are separated, and the oil phase is above the water phase (the gas phase is above the oil phase). As the oil, gas and water three-phase fluid entering the three-phase separator 3 increases, if the height of the upper liquid surface of the separated oil phase is higher than the height of the first photoelectric sensing liquid level detector 4, the first photoelectric sensing liquid level detector 4 can detect the oil phase and send the detection result to the controller, and the controller controls the first switch valve on the oil discharge pipeline. 20 (the first switch valve 20 can be optionally a pneumatic valve or a solenoid valve) is opened to conduct the oil drain pipeline, so that the oil phase in the three-phase separator 3 is discharged outward through the oil drain pipeline. During the oil phase discharge process, the oil phase metering device 7 will measure the flow rate of the oil phase flowing through it and obtain second metering data, and the oil phase metering device 7 will then send the second metering data to the controller; if the height of the upper liquid surface of the separated oil phase is lower than the height of the first photoelectric sensing liquid level detector 4, the first photoelectric sensing liquid level detector 4 cannot detect the oil phase, the controller does not control the first switch valve 20, and the oil phase metering device 7 does not work.

[0080] If the height of the upper liquid surface of the separated water phase is higher than the height of the second photoelectric sensing liquid level detector 5, the second photoelectric sensing liquid level detector 5 can detect the water phase and send the detection result to the controller. The controller controls the second switch valve on the drainage pipeline (the second switch valve can be optionally a pneumatic valve or a solenoid valve) to open to conduct the drainage pipeline, so that the water phase in the three-phase separator 3 is discharged outward through the drainage pipeline. During the water phase discharge process, the water phase metering device 8 will measure the flow rate of the water phase flowing through it and obtain third metering data, and the water phase metering device 8 will then send the third metering data to the controller; if the height of the upper liquid surface of the separated water phase is lower than the height of the second photoelectric sensing liquid level detector 5, the second photoelectric sensing liquid level detector 5 cannot detect the oil phase, the controller does not control the second switch valve, and the water phase metering device 8 does not work.

[0081] Furthermore, before executing step S101, the controller further executes the following steps:

[0082] Step S001: determining that a first preset volume of water phase is pre-stored in the three-phase separator 3, wherein the first preset volume refers to the volume of the water phase pre-stored in the three-phase separator 3 when the upper liquid surface of the water phase is at the height of the second photoelectric liquid level detector 5;

[0083] Step S002: Determine whether a second preset volume of oil phase is pre-stored in the three-phase separator 3, wherein the second preset volume refers to the volume of the oil phase pre-stored in the three-phase separator 3 when the upper liquid surface of the oil phase is at the height of the first photoelectric liquid level detector 4 when the first preset volume of water phase is pre-stored in the three-phase separator 3.

[0084] When step S001-step S002 is completed, the oil, gas and water three-phase fluid produced by the production well of the large-scale physical simulation experiment enters the three-phase separator 3 and is separated into the gas phase, water phase and oil phase. The first photoelectric sensing liquid level detector 4 and the second photoelectric sensing liquid level detector 5 can detect the oil phase and the water phase respectively, and the gas phase, water phase and oil phase in the three-phase separator 3 will all be discharged outward. In this case, the controller determines that the first metering data detected by the gas phase detection device is the gas phase production of the large-scale physical simulation experiment, the second metering data detected by the oil phase detection device is the oil phase production of the large-scale physical simulation experiment, and the third metering data detected by the water phase detection device is the water phase production of the large-scale physical simulation experiment.

[0085] The oil-gas-water three-phase separation and metering device in this embodiment has a simple structure and is easy to control. Since it can automatically discharge the gas phase, oil phase and water phase that enter the three-phase separator 3 and are separated in a timely manner, and measure the flow of the discharged gas phase, oil phase and water phase separately, it can measure the flow of the oil-gas-water three-phase fluid produced by large-scale physical simulation experiments in real time with large flow, long period and continuous uninterruptedness, eliminating errors caused by human factors and improving the accuracy of measurement.

[0086] In one embodiment of the present application, Figure 2 As shown, the interior of the three-phase separator 3 is formed with a first cavity 12, a second cavity 13, a first connecting channel 15, a second connecting channel 16 and a third connecting channel. The first cavity 12 includes a first accommodating section, a second accommodating section and a third accommodating section that are vertically connected in sequence. The second cavity 13 includes a fourth accommodating section, a fifth accommodating section and a sixth accommodating section that are vertically connected in sequence. The two ends of the first connecting channel 15 are respectively connected to the first accommodating section and the fourth accommodating section. The first accommodating section, the fourth accommodating section and the first connecting channel 15 together constitute a gas phase accommodating chamber. The two ends of the second connecting channel 16 are respectively connected to the second accommodating section and the fifth accommodating section. The second accommodating section, the fifth accommodating section and the second connecting channel 16 together constitute an oil phase accommodating chamber. The two ends of the third connecting channel are respectively connected to the third accommodating section and the sixth accommodating section. The third accommodating section, the sixth accommodating section and the third connecting channel together constitute a water phase accommodating chamber.

[0087] Specifically, the first cavity 12 and the second cavity 13 are both straight cylindrical, and the first connecting channel 15, the second connecting channel 16 and the third connecting channel are all arranged in the horizontal direction. The arrangement of the first connecting channel 15, the second connecting channel 16 and the third connecting channel makes the top, middle and bottom of the three-phase separator 3 connected to form a communicating vessel. When the oil, gas and water three-phase fluid produced by the production well of the large-scale physical simulation experiment enters the first cavity 12 of the three-phase separator 3 and is separated, it can enter the second cavity 13 through the first connecting channel 15, the second connecting channel 16 and the third connecting channel, and the upper and lower liquid level heights of the gas phase, oil phase and water phase in the first cavity 12 are consistent with their respective upper and lower liquid level heights in the second cavity 13, such as the upper liquid level of the oil phase in the first cavity 12 is flush with the upper liquid level of the oil phase in the second cavity 13, and the lower liquid level of the oil phase in the first cavity 12 is flush with the lower liquid level of the oil phase in the second cavity 13.

[0088] The inlet pipe is connected to the top of the first cavity 12, and the exhaust pipe is connected to the top of the second cavity 13 via a rubber stopper 19. The oil phase outlet 17 and the water phase outlet 18 are both located on the sidewall of the first cavity 12. The first photoelectric liquid level detector 4 and the second photoelectric liquid level detector 5 are both located on the side of the second cavity 13 away from the first cavity 12. In addition, the first photoelectric liquid level detector 4 and the second photoelectric liquid level detector 5 are respectively located above and below the second connecting channel 16. Because the movement of the gas phase, oil phase, and water phase in the second cavity 13 is smoother than that in the first cavity 12, the above-mentioned structural arrangement helps improve the detection accuracy of the first photoelectric liquid level detector 4 and the second photoelectric liquid level detector 5, and thus helps further improve the metering accuracy of the oil-gas-water three-phase separation metering device.

[0089] In one embodiment of the present application, a first scale 14 is provided on the side wall of the first accommodating chamber for facilitating human observation of the liquid level of the water phase and / or the oil phase.

[0090] In one embodiment of the present application, the first photoelectric sensing liquid level detector 4 has a first transmitting end and a first receiving end, the first transmitting end is used to transmit a first optical signal, and the first receiving end is used to receive the first optical signal and convert the first optical signal into a first electrical signal, and the first transmitting end and the first receiving end are respectively located on opposite sides of the second cavity 13;

[0091] The second photoelectric liquid level detector 5 includes a second transmitting end and a second receiving end. The second transmitting end is used to transmit a second optical signal, and the second receiving end is used to receive the second optical signal and convert the second optical signal into a second electrical signal. The second transmitting end and the second receiving end are respectively located on opposite sides of the second cavity 13.

[0092] Specifically, in this embodiment, the first photoelectric liquid level detector 4 and the second photoelectric liquid level detector 5 are both through-beam photoelectric sensors, which include a light emitting end (i.e., a first emitting end and a second emitting end) and a light receiving end (i.e., a first receiving end and a second receiving end) respectively located on opposite sides of the second cavity 13. When the water phase or the gas phase blocks the first photoelectric liquid level detector 4 or the second photoelectric liquid level detector 5, the light signal (such as infrared light or visible light) emitted by the light emitting end can be received by the light receiving end; when the oil phase blocks the first photoelectric liquid level detector 4 or the second photoelectric liquid level detector 5, the light signal emitted by the light emitting end is blocked and cannot be received by the light receiving end. The photoelectric switch in the through-beam photoelectric sensor outputs a switch control signal (i.e., an electrical signal) to cut off or connect the load current, and the controller performs corresponding control after obtaining the above-mentioned current change.

[0093] The detection component in this embodiment also includes a first support frame arranged on one side of the second accommodating cavity, and the first photoelectric liquid level detector 4 and the second photoelectric liquid level detector 5 can be vertically movably arranged on the first support frame so as to adjust the height position of the first photoelectric liquid level detector 4 and / or the second photoelectric liquid level detector 5 according to actual needs.

[0094] In one embodiment of the present application, determining that the first photoelectric liquid level detector 4 detects the oil phase includes:

[0095] determining that the first receiving end does not receive the first optical signal; and

[0096] Determining that the second photoelectric liquid level detector 5 detects the water phase includes:

[0097] It is determined that the second receiving end receives the second optical signal.

[0098] Specifically, if the first receiving end does not receive the first optical signal emitted by the first transmitting end, it means that the height of the upper liquid level of the oil phase in the second cavity 13 is higher than the height of the first photoelectric sensing liquid level detector 4. The photoelectric switch in the first photoelectric sensing liquid level detector 4 sends a corresponding current change signal (i.e., a first electrical signal) to the controller. After receiving the above current change signal, the controller controls the first on-off valve 20 on the oil discharge pipeline to open.

[0099] Similarly, if the second receiving end does not receive the second light signal emitted by the second transmitting end, it means that the height of the upper liquid surface of the water phase in the second cavity 13 is higher than the height of the second photoelectric sensing liquid level detector 5. The photoelectric switch in the second photoelectric sensing liquid level detector 5 sends a corresponding current change signal (i.e., a second electrical signal) to the controller. After receiving the above current change signal, the controller controls the second switch valve on the oil discharge pipeline to open.

[0100] In one embodiment of the present application, the gas phase metering device 9 includes a first gas phase meter and a second gas phase meter, the first measuring range of the first gas phase meter is smaller than the second measuring range of the second gas phase meter, and controlling the gas phase metering device 9 to measure the flow rate of the gas phase in the exhaust pipeline includes:

[0101] opening the first gas phase meter and closing the second gas phase meter;

[0102] When it is determined that the flow rate of the gas phase reaches a first preset proportion of the first measuring range, the first gas phase meter is turned off and the second gas phase meter is turned on, so that the second gas phase meter measures the flow rate of the gas phase; or

[0103] When it is determined that the flow rate of the gas phase does not reach the first preset proportion of the first range, the first gas phase meter is controlled to be continuously opened and the second gas phase meter is controlled to be continuously closed, so that the first gas phase meter measures the flow rate of the gas phase.

[0104] Specifically, if Figure 5 As shown, in this embodiment, the first gas phase meter can be selected as a high-precision wet gas flow meter, and the second gas phase meter can be selected as a large-displacement wet gas flow meter. After the oil-gas-water three-phase separation metering device is turned on, the high-precision gas flow meter is turned on first. If the gas phase flow in the exhaust pipeline is lower than the first preset proportion of the range of the high-precision wet gas flow meter (such as 50%), it means that the gas phase production at this time is small. The controller controls the high-precision wet gas flow meter to be continuously turned on and controls the large-displacement wet gas flow meter to be continuously turned off, so as to continue to use the high-precision wet gas flow meter to measure the gas phase production, thereby ensuring the accuracy of gas phase measurement; if the gas phase flow in the exhaust pipeline is higher than the first preset proportion of the range of the high-precision wet gas flow meter (such as 50%), it means that the gas phase production at this time is large. The controller controls the high-precision wet gas flow meter to be turned off and controls the large-displacement wet gas flow meter to be turned on, so as to use the large-displacement wet gas flow meter to measure the gas phase production, thereby avoiding damage to the high-precision wet gas flow meter.

[0105] In one embodiment of the present application, the oil phase metering device 7 includes a first oil phase meter and a second oil phase meter, the third range of the first oil phase meter is smaller than the fourth range of the second oil phase meter, and controlling the oil phase metering device 7 to measure the flow rate of the oil phase in the oil discharge pipeline includes:

[0106] opening the first oil phase meter and closing the second oil phase meter;

[0107] When it is determined that the flow rate of the oil phase reaches the second preset proportion of the third range, the first oil phase meter is closed and the second oil phase meter is opened, so that the second oil phase meter measures the flow rate of the oil phase; or

[0108] When it is determined that the flow rate of the oil phase does not reach the second preset proportion of the third range, the first oil phase meter is controlled to be continuously opened and the second oil phase meter is controlled to be continuously closed, so that the first oil phase meter measures the flow rate of the oil phase.

[0109] Specifically, in this embodiment, the first oil phase meter can be selected as a high-precision oil phase metering pump, and the second oil phase meter can be selected as a large-displacement oil phase metering pump. After the oil discharge pipeline is connected, the high-precision oil phase metering pump is turned on first. If the oil phase flow rate in the oil discharge pipeline is lower than the second preset proportion (such as 50%) of the measuring range of the high-precision oil phase metering pump, it means that the oil phase production at this time is small. The controller controls the high-precision oil phase metering pump to be continuously turned on and controls the large-displacement oil phase metering pump to be continuously turned off, so as to continue to use the high-precision oil phase metering pump to measure the oil phase production, thereby ensuring the accuracy of oil phase measurement; if the oil phase flow rate in the oil discharge pipeline is higher than the second preset proportion (such as 50%) of the measuring range of the high-precision oil phase metering pump, it means that the oil phase production at this time is large. The controller controls the high-precision oil phase metering pump to be turned off and controls the large-displacement oil phase metering pump to be turned on, so as to use the large-displacement oil phase metering pump to measure the oil phase production, thereby avoiding damage to the high-precision oil phase metering pump.

[0110] In another embodiment of the present application, the oil phase metering device 7 further includes:

[0111] A holding tank assembly, comprising a first holding tank 23 and a second holding tank, both for storing an oil phase;

[0112] A first weight detector 24 is used to detect the weight of the oil phase in the first holding tank 23;

[0113] a second weight detector, used for detecting the weight of the oil phase in the second holding tank;

[0114] The selector 21 is formed with an oil inlet, a first oil outlet, and a second oil outlet. The oil inlet is connected to an end of the oil discharge pipeline away from the three-phase separator 3. The first oil outlet is connected to the first holding tank 23 via a first branch pipe, and the second oil outlet is connected to the second holding tank via a second branch pipe.

[0115] The controller is also configured to:

[0116] After confirming that the oil discharge pipeline is connected, the selector 21 is controlled to open the first oil outlet and close the second oil outlet, so that the oil phase enters the first holding tank 23;

[0117] controlling the first weight detector 24 to detect the weight of the oil phase in the first holding tank 23;

[0118] Determining whether the weight of the oil phase in the first holding tank 23 reaches a preset weight;

[0119] The control selector 21 closes the first oil outlet and opens the second oil outlet, so that the oil phase enters the second holding tank.

[0120] Specifically, the first holding tank 23 and the second holding tank are respectively positioned above a first weight detector 24 and a second weight detector. Both the first weight detector 24 and the second weight detector can be scales that are communicatively connected to the controller. The oil phase metering device 7 also includes a second support frame 22, on which the selector 21 is mounted. The first branch pipe is detachably connected to the first holding tank 23, and the second branch pipe is detachably connected to the second holding tank, allowing operators to replace the first and second holding tanks as needed. Furthermore, a second scale is provided on each of the first and second holding tanks to facilitate observation of changes in the volume of the oil phase in the first and second holding tanks.

[0121] After the controller controls the second switch valve to open, it controls the selector 21 to open the first oil outlet (while controlling the first oil outlet to remain closed), and the oil phase in the second holding chamber passes through the oil phase outlet 17, the second switch valve, and the selector 21 into the first holding tank 23 of the first preset volume (such as 2L). The weight change of the oil phase in the first holding tank 23 is detected by the first weight detector 24. When the weight in the first holding tank 23 reaches the preset weight (such as 1.5kg, the liquid level of 1.5kg of oil phase will reach 90% of the total height of the first holding tank 23), the first weight detector 24 sends a corresponding signal to the controller, and the controller controls the selector 21 to close the first oil outlet and open the second oil outlet, so that the oil phase enters the second holding tank of the second preset volume (such as 2L). The operator can replace the first holding tank 23 according to actual needs. Furthermore, the preset weight of the oil phase has a corresponding preset volume, so the controller can determine the volume of the oil phase in the first holding tank 23 and / or the second holding tank based on the weight detection results of the first weight detector 24 and / or the second weight detector.

[0122] In one embodiment of the present application, the water phase metering device 8 includes a first water phase meter and a second water phase meter, the fifth range of the first water phase meter is smaller than the sixth range of the second water phase meter, and controlling the water phase metering device 8 to measure the flow rate of the water phase in the drainage pipeline includes:

[0123] Open the first water phase meter and close the second water phase meter;

[0124] When it is determined that the flow rate of the water phase reaches the third preset ratio of the fifth measuring range, the first water phase meter is turned off and the second water phase meter is turned on, so that the second water phase meter measures the flow rate of the water phase; or

[0125] When it is determined that the flow rate of the water phase does not reach the third preset proportion of the fifth range, the first water phase meter is controlled to be continuously opened and the second water phase meter is controlled to be continuously closed, so that the first water phase meter measures the flow rate of the water phase.

[0126] Specifically, in this embodiment, the first water phase meter can be selected as a high-precision water phase flowmeter, and the second water phase meter can be selected as a large-displacement water phase flowmeter. After the drainage pipeline is connected, the high-precision water phase flowmeter is turned on first. If the water phase flow in the drainage pipeline is lower than the third preset proportion of the range of the high-precision water phase flowmeter (such as 50%), it means that the water phase output is small at this time. The controller controls the high-precision water phase flowmeter to be continuously turned on and controls the large-displacement water phase flowmeter to be continuously turned off, so as to continue to use the high-precision water phase flowmeter to measure the water phase output, thereby ensuring the accuracy of water phase measurement; if the water phase flow in the drainage pipeline is higher than the third preset proportion of the range of the high-precision water phase flowmeter (such as 50%), it means that the water phase output is large at this time. The controller controls the high-precision water phase flowmeter to be turned off and controls the large-displacement water phase flowmeter to be turned on, so as to use the large-displacement water phase flowmeter to measure the water phase output, thereby avoiding damage to the high-precision water phase flowmeter.

[0127] In one embodiment of the present application, the oil, gas and water three-phase separation and metering device further includes:

[0128] A sealing cover assembly, which is arranged on the top of the first accommodating cavity;

[0129] The lubricator 11 has an upper end inserted into the sealing cover assembly and connected to the oil, gas and water three-phase flow source, and a lower end of the lubricator 11 is in an inverted truncated cone shape and communicated with the first accommodating cavity.

[0130] Specifically, the sealing cover assembly includes a top cover 10 and an O-ring. The top cover 10 is made of plastic and is covered on the top of the first accommodating chamber. The O-ring is arranged between the top cover 10 and the cavity wall of the first accommodating chamber to seal the gap between the top cover 10 and the first accommodating chamber. The outer side of the top cover 10 is provided with an input pipe interface for connecting the input pipe. The upper end of the lubricant preventer 11 is inserted on the inner side of the top cover 10. The inner side of the lubricant preventer 11 has a smoothbore groove, and the lower part has an inverted frustum-shaped structure for gas-liquid separation, which can prevent the output oil phase from being sprayed and affecting the metering accuracy.

[0131] In one embodiment of the present application, the oil-gas-water three-phase separation metering device further includes a constant temperature box 6 disposed outside the three-phase separator 3 and used to prevent the oil phase from solidifying.

[0132] Specifically, the three-phase separator 3, the back pressure valve 1, the first photoelectric liquid level detector 4 and the second photoelectric liquid level detector 5 are all arranged inside the constant temperature box 6, and the back pressure pump 2, the oil phase metering device 7, the water phase metering device 8, and the gas flow meter group are all arranged outside the constant temperature box 6. Before performing the three-phase metering of oil, gas and water, the temperature of the constant temperature box 6 is first set to a preset temperature, which is higher than the freezing point of the oil phase.

[0133] The following examples further illustrate the structure and use of the oil-gas-water three-phase separation and metering device of the present application. The examples are implemented based on the technical solution of the present application and provide detailed implementation methods and specific operating procedures, but the scope of protection of the present application is not limited to the following examples.

[0134] Example 1

[0135] This embodiment provides an oil-gas-water three-phase separation and metering device, the structure of which is as follows: Figure 1 As shown, the main body of the oil-gas-water three-phase separation and metering device is a glass three-phase separator 3 placed within a constant temperature chamber 6. The three-phase separator 3 has a first and second accommodating chambers of different diameters. A first connecting channel 15, a second connecting channel 16, and a third connecting channel connect the first and second accommodating chambers. A calibrated first scale 14 is marked on the wall of the first accommodating chamber between the first and second connecting channels 15, 16, allowing for manual reading of the gas-liquid interface. A calibrated first scale 14 is also marked on the wall of the first accommodating chamber below the second connecting channel 16, allowing for manual reading of the oil-water interface. A plastic cover 10 is installed on the top of the first accommodating chamber. This cover 10 fits snugly into the first accommodating chamber and is sealed with an O-ring. An inlet pipe connection is mounted on the outside of the cover 10. A lubricant preventer 11 is mounted on the inside of the cover 10. This lubricant preventer 11 has smoothbore grooves and a funnel-shaped structure at the bottom for gas-liquid separation, preventing oil spray from affecting metering accuracy. An oil phase outlet 17 is located in the middle of the first accommodating chamber. A water phase outlet 18 is located at the bottom of the first accommodating chamber. A rubber stopper 19 is located at the top of the second accommodating chamber, and an exhaust pipe is installed on top of the rubber stopper 19. A first support frame is provided adjacent to the second accommodating chamber, on which are mounted a first photoelectric liquid level detector 4 and a second photoelectric liquid level detector 5. The first and second photoelectric liquid level detectors 4 and 5 are movable on the first support frame and are used to monitor the positions of the gas-liquid interface and the oil-water interface, respectively.

[0136] Preferably, the three-phase separator 3, back pressure valve 1, first photoelectric sensing liquid level detector 4 and second photoelectric sensing liquid level detector 5 are all placed in the constant temperature box 6, and the back pressure pump 2, oil phase metering device 7, water phase metering device 8 and gas phase metering device 9 are all placed outside the constant temperature box 6.

[0137] Preferably, the external input pipe interface of the top cover 10 is connected to the wellhead of the production well of the large-scale physical simulation experiment device via an input pipe. A back-pressure valve 1 is installed on the input pipe and is used to control the wellhead pressure of the production well during the large-scale physical simulation experiment. The control port of the back-pressure valve 1 is connected to a back-pressure pump 2 located outside the thermostat 6 via a control line through a through-hole in the thermostat 6. The back-pressure pump 2 is used to control the back pressure.

[0138] Preferably, the oil phase outlet 17 on the three-phase separator 3 is connected to the oil phase metering device 7 through the through-hole on the thermostatic box 6 via an oil discharge pipeline. The oil phase metering device 7 is used to measure the oil phase output.

[0139] Preferably, the water phase outlet 18 on the three-phase separator 3 is connected to the water phase metering device 8 through the through-hole on the thermostat 6 via a drainage pipeline. The water phase metering device 8 is used to measure the water phase output.

[0140] Preferably, the gas phase outlet on the rubber stopper 19 is connected to the gas phase metering device 9 through the through-hole on the thermostat 6 via an exhaust pipe; further, according to experimental requirements, the gas phase metering device 9 can be selected as a combination of gas flow meters of different ranges.

[0141] The first photoelectric liquid level detector 4 and the second photoelectric liquid level detector 5 are through-beam photoelectric sensors, consisting of a pair of light emitting and receiving ends located on either side of the second chamber. When the second chamber contains water or gas, the receiving ends can receive infrared or visible light emitted by the emitter. When the second chamber contains oil, the light is blocked, and the photoelectric switch outputs a switch control signal, cutting off or connecting the load current, thereby completing a control operation. The first photoelectric liquid level detector 4 and the second photoelectric liquid level detector 5 are connected to the data processing terminal (i.e., the controller) via circuitry, and are connected to the oil phase metering device 7 and the water phase metering device 8 via control circuitry.

[0142] Example 2

[0143] This embodiment provides another structure of an oil-gas-water three-phase separation and metering device. In the embodiment, the maximum liquid production rate flow rate of the large-scale physical simulation experiment is 100 mL / min, the maximum gas production rate is 10 L / min, and the density of the oil phase is 8.3 g / min. The following describes the method of using the oil-gas-water three-phase separation and metering device of this structure.

[0144] The oil phase metering device 7 used in this embodiment uses a weight method to measure the liquid production. The structure of the oil phase metering device 7 is as follows: Figure 3 shown.

[0145] Add the transparent aqueous phase to the three-phase separator 3 so that the gas-water interface exceeds the water phase outlet 18, is below a certain mark on the second connecting channel 16 and the oil phase outlet 17, and is aligned with the height of the first photoelectric liquid level detector 4. Add the opaque oil phase to the three-phase separator 3 so that the oil-gas interface exceeds the second connecting channel 16 and the oil phase outlet 17, is below a certain mark on the first connecting channel 15, and is aligned with the height of the second photoelectric liquid level detector 5. Set the temperature of the thermostat 6 to the desired measurement temperature, which should be above the freezing point of the crude oil.

[0146] Connect the oil, gas and water three-phase separation metering device to the outlet of the large-scale physical simulation experimental device, empty the oil phase metering device 7 and the water phase metering device 8 and reset the values ​​to 0, reset the value of the gas phase metering device 9 to 0, and start measuring the output of the oil phase, gas phase and water phase.

[0147] After passing through the back-pressure valve 1, the pressure of the produced oil, gas, and water three-phase fluid is reduced to atmospheric pressure, the gas and liquid are rapidly separated, and the gas volume rapidly expands. After passing through the lubricator 11, the gas phase moves upward, passing through the first connecting channel 15, the second accommodating chamber, and the rubber stopper 19 to enter the high-precision gas mass flowmeter of the gas phase metering device 9. The controller measures the gas phase production data in real time. When the gas phase flow rate is less than 50% of the high-precision wet gas flowmeter range, the high-precision gas flowmeter is used to measure the gas production volume. When the gas phase flow rate is higher than 50% of the high-precision wet gas flowmeter range, the high-displacement gas mass flowmeter is automatically turned on, and the controller measures the gas phase production data in real time. When the gas phase flow rate is less than 50% of the high-precision wet gas flowmeter range, the high-displacement gas mass flowmeter is automatically turned on, and the controller measures the gas phase production data in real time. When the gas phase flow rate is less than 50% of the high-precision wet gas flowmeter range, the high-displacement gas flowmeter is automatically turned off.

[0148] After the oil-gas-water three-phase fluid produced passes through the blowout preventer 11, the oil phase and water phase enter the first storage chamber, causing the gas-liquid interface to rise, and at the same time, the oil and water phases separate under the action of gravity. Since the first storage chamber is connected to the bottom, middle, and top of the second storage chamber to form a communicating vessel, the interface fluctuation in the first storage chamber will not affect the interface of the second storage chamber. When the gas-liquid interface in the second storage chamber rises, the opaque oil phase will block the first photoelectric sensing liquid level detector 4. The first photoelectric sensing liquid level detector 4 sends a signal to open the first switch valve 20 of the oil phase metering device 7. The oil phase in the first storage chamber passes through the oil phase outlet 17, the first switch valve 20, and the selector 21 into a first storage tank 23 with a volume of 2L, and the first weight detector 24 measures the change in the weight of the oil phase in the first storage tank 23. When the weight of the oil phase in the first holding tank 23 reaches 1.5 kg (after the liquid level reaches 90%), the selector 21 switches to the second holding tank with a volume of 2 L, and the change in the weight of the oil phase in the second holding tank is measured by the second weight detector. The operator then manually replaces the filled first holding tank 23.

[0149] The produced aqueous phase separates under the action of gravity and settles to the lower portion of the three-phase separator 3. When the oil-water interface in the second accommodating chamber rises, the transparent aqueous phase causes the second photoelectric level detector 5 to generate a photoelectric signal, opening the second on-off valve of the aqueous phase metering device 8. The aqueous phase in the first accommodating chamber is discharged into the waste liquid collection container through the aqueous phase outlet 18, the second on-off valve, and the aqueous phase metering device 8. A high-precision aqueous phase flowmeter is preferably a capacitance flowmeter for measuring aqueous phase production at low flow rates; a high-displacement aqueous phase flowmeter is preferably a rotor flowmeter for measuring aqueous phase production at high flow rates.

[0150] Example 3

[0151] This embodiment provides another structure of an oil-gas-water three-phase separation and metering device. In the embodiment, the maximum liquid production rate flow rate of the large-scale physical simulation experiment is 1 L / min, the maximum gas production rate is 10 L / min, and the density of the oil phase is 8.3 g / min. The following describes the method of using the oil-gas-water three-phase separation and metering device of this structure.

[0152] Add the transparent aqueous phase to the three-phase separator 3 so that the gas-water interface exceeds the water phase outlet 18, is below a certain mark on the second connecting channel 16 and the oil phase outlet 17, and is aligned with the height of the first photoelectric liquid level detector 4. Add the opaque oil phase to the three-phase separator 3 so that the oil-gas interface exceeds the second connecting channel 16 and the oil phase outlet 17, is below a certain mark on the first connecting channel 15, and is aligned with the height of the second photoelectric liquid level detector 5. Set the temperature of the thermostat 6 to the desired measurement temperature, which should be above the freezing point of the crude oil.

[0153] Connect the oil, gas and water three-phase separation metering device to the outlet of the large-scale physical simulation experimental device, empty the oil phase metering device 7 and the water phase metering device 8 and reset the values ​​to 0, reset the value of the gas phase metering device 9 to 0, and start measuring the output of the oil phase, gas phase and water phase.

[0154] After passing through the back-pressure valve 1, the pressure of the produced oil, gas, and water three-phase fluid is reduced to atmospheric pressure, the gas and liquid are rapidly separated, and the gas volume rapidly expands. After passing through the lubricator 11, the gas phase moves upward, passing through the first connecting channel 15, the second accommodating chamber, and the rubber stopper 19 to enter the high-precision gas mass flowmeter of the gas phase metering device 9. The controller measures the gas phase production data in real time. When the gas phase flow rate is less than 50% of the high-precision wet gas flowmeter range, the high-precision gas flowmeter is used to measure the gas production volume. When the gas phase flow rate is higher than 50% of the high-precision wet gas flowmeter range, the high-displacement gas mass flowmeter is automatically turned on, and the controller measures the gas phase production data in real time. When the gas phase flow rate is less than 50% of the high-precision wet gas flowmeter range, the high-displacement gas mass flowmeter is automatically turned on, and the controller measures the gas phase production data in real time. When the gas phase flow rate is less than 50% of the high-precision wet gas flowmeter range, the high-displacement gas flowmeter is automatically turned off.

[0155] After the oil, gas and water three-phase fluid produced passes through the blowout preventer 11, the oil phase and water phase enter the first storage chamber, causing the gas-liquid interface to tend to rise, and at the same time, the oil and water phases separate under the action of gravity. Since the first storage chamber is connected to the bottom, middle and top of the second storage chamber to form a communicating vessel, the interface fluctuation in the first storage chamber will not affect the interface of the second storage chamber. When the gas-liquid interface in the second storage chamber rises, the opaque oil phase will block the first photoelectric sensing liquid level detector 4, and the first photoelectric sensing liquid level detector 4 will send a signal to open the first switch valve 20 of the oil phase metering device 7. The oil phase in the first storage chamber is discharged into the waste oil collection container through the oil phase outlet 17, the first switch valve 20, and the oil phase flow metering pump. Among them, the high-precision oil phase metering pump is preferably a piston metering pump for measuring the oil phase output; the large-displacement oil phase metering pump is preferably a diaphragm flowmeter.

[0156] The produced water phase separates under the action of gravity and settles to the lower part of the three-phase separator 3. When the oil-water interface in the second accommodating chamber rises, the transparent water phase will cause the second photoelectric sensing liquid level detector 5 to generate a photoelectric signal, so that the second switch valve of the water phase metering device 8 is opened, and the water phase in the first accommodating chamber is discharged into the waste liquid collection container through the water phase outlet 18, the second switch valve, and the water phase flowmeter. Among them, the high-precision water phase flowmeter is preferably an electromagnetic flowmeter, which is used to measure the water phase production at small flow rates; the large-displacement water phase flowmeter is preferably a turbine flowmeter, which is used to measure the water phase production at large flow rates.

[0157] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0158] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0159] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0160] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An oil, gas and water three-phase separation and metering device, characterized in that: The oil, gas and water three-phase separation and metering device comprises: A three-phase separator (3), wherein a gas phase accommodating chamber, an oil phase accommodating chamber, and a water phase accommodating chamber are formed in sequence from top to bottom, and the gas phase accommodating chamber is connected to an oil, gas, and water three-phase flow source; A gas phase metering device is provided on an exhaust pipe connected to the gas phase containing chamber; An oil phase metering device (7) is provided on an oil discharge pipeline connected to the oil phase containing chamber; A water phase metering device (8) is provided on a drainage pipeline connected to the water phase containing chamber; The detection component comprises a first photoelectric sensing liquid level detector (4) and a second photoelectric sensing liquid level detector (5), wherein the first photoelectric sensing liquid level detector (4) is arranged at a boundary position between the gas phase containing chamber and the oil phase containing chamber and is used to detect the oil phase, and the second photoelectric sensing liquid level detector (5) is arranged at a boundary position between the oil phase containing chamber and the water phase containing chamber and is used to detect the water phase; The controller is configured to: controlling the gas phase metering device to measure the flow of the gas phase in the exhaust pipeline; Determining that the first photoelectric liquid level detector (4) detects the oil phase; The oil discharge pipeline is opened and the oil phase metering device (7) is controlled to measure the flow rate of the oil phase in the oil discharge pipeline; Determining that the second photoelectric liquid level detector (5) detects the water phase; The drainage pipeline is opened and the water phase metering device (8) is controlled to measure the flow rate of the water phase in the drainage pipeline; The gas phase production, oil phase production and water phase production of the oil-gas-water three-phase flow source are determined based on the first metering data of the gas phase metering device, the second metering data of the oil phase metering device (7) and the third metering data of the water phase metering device (8).

2. The oil, gas and water three-phase separation and metering device according to claim 1, characterized in that: The interior of the three-phase separator (3) is formed with a first cavity (12), a second cavity (13), a first connecting channel (15), a second connecting channel (16) and a third connecting channel, wherein the first cavity (12) includes a first accommodating section, a second accommodating section and a third accommodating section which are vertically connected in sequence, and the second cavity (13) includes a fourth accommodating section, a fifth accommodating section and a sixth accommodating section which are vertically connected in sequence, the two ends of the first connecting channel (15) are respectively connected to the first accommodating section and the fourth accommodating section, the first accommodating section, the fourth accommodating section and the first connecting channel (15) together constitute the gas phase accommodating chamber, the two ends of the second connecting channel (16) are respectively connected to the second accommodating section and the fifth accommodating section, the second accommodating section, the fifth accommodating section and the second connecting channel (16) together constitute the oil phase accommodating chamber, the two ends of the third connecting channel are respectively connected to the third accommodating section and the sixth accommodating section, the third accommodating section, the sixth accommodating section and the third connecting channel together constitute the water phase accommodating chamber.

3. The oil, gas and water three-phase separation and metering device according to claim 2, characterized in that: The first photoelectric sensing liquid level detector (4) comprises a first transmitting end and a first receiving end, wherein the first transmitting end is used to transmit a first optical signal, and the first receiving end is used to receive the first optical signal and convert the first optical signal into a first electrical signal, and one of the first transmitting end and the first receiving end is arranged inside the second cavity (13) and at the boundary between the fourth accommodating section and the fifth accommodating section, and the other is arranged outside the second cavity (13); The second photoelectric sensing liquid level detector (5) comprises a second transmitting end and a second receiving end, wherein the second transmitting end is used to transmit a second optical signal, and the second receiving end is used to receive the second optical signal and convert the second optical signal into a second electrical signal, and one of the second transmitting end and the second receiving end is arranged inside the second cavity (13) and at the boundary position between the fifth accommodating section and the sixth accommodating section, and the other is arranged outside the second cavity (13).

4. The oil, gas and water three-phase separation and metering device according to claim 3, characterized in that: The determining that the first photoelectric sensing liquid level detector (4) detects the oil phase comprises: determining that the first receiving end does not receive the first optical signal; and The determination that the second photoelectric liquid level detector (5) detects the water phase comprises: Determine whether the second receiving end receives the second optical signal.

5. The oil, gas and water three-phase separation and metering device according to claim 3, characterized in that: The gas phase metering device includes a first gas phase meter and a second gas phase meter, wherein a first measuring range of the first gas phase meter is smaller than a second measuring range of the second gas phase meter, and controlling the gas phase metering device to measure the flow rate of the gas phase in the exhaust pipeline includes: opening the first gas phase meter and closing the second gas phase meter; When it is determined that the flow rate of the gas phase reaches a first preset proportion of the first measuring range, the first gas phase meter is turned off and the second gas phase meter is turned on, so that the second gas phase meter measures the flow rate of the gas phase; or When it is determined that the flow rate of the gas phase does not reach the first preset proportion of the first measuring range, the first gas phase meter is controlled to be continuously opened and the second gas phase meter is controlled to be continuously closed, so that the first gas phase meter measures the flow rate of the gas phase.

6. The oil, gas and water three-phase separation and metering device according to claim 3, characterized in that: The oil phase metering device (7) comprises a first oil phase meter and a second oil phase meter, wherein the third measuring range of the first oil phase meter is smaller than the fourth measuring range of the second oil phase meter, and the controlling of the oil phase metering device (7) to measure the flow rate of the oil phase in the oil discharge pipeline comprises: opening the first oil phase meter and closing the second oil phase meter; When it is determined that the flow rate of the oil phase reaches the second preset proportion of the third measuring range, the first oil phase meter is closed and the second oil phase meter is opened, so that the second oil phase meter measures the flow rate of the oil phase; or When it is determined that the flow rate of the oil phase does not reach the second preset proportion of the third range, the first oil phase meter is controlled to be continuously opened and the second oil phase meter is controlled to be continuously closed, so that the first oil phase meter measures the flow rate of the oil phase.

7. The oil, gas and water three-phase separation and metering device according to claim 3, characterized in that: The oil phase metering device (7) further comprises: A holding tank assembly, comprising a first holding tank (23) and a second holding tank, both for storing the oil phase; a first weight detector (24) for detecting the weight of the oil phase in the first holding tank (23); a second weight detector, configured to detect the weight of the oil phase in the second holding tank; A selector (21), wherein the selector (21) is formed with an oil inlet, a first oil outlet, and a second oil outlet, the oil inlet being connected to an end of the oil discharge pipeline away from the three-phase separator (3), the first oil outlet being connected to the first holding tank (23) via a first branch pipe, and the second oil outlet being connected to the second holding tank via a second branch pipe; The controller is further configured to: controlling the selector (21) to open the first oil outlet and close the second oil outlet, so that the oil phase enters the first holding tank (23); controlling the first weight detector (24) to detect the weight of the oil phase in the first holding tank (23); Determining whether the weight of the oil phase in the first holding tank (23) reaches a preset weight; The selector (21) is controlled to close the first oil outlet and open the second oil outlet, so that the oil phase enters the second holding tank.

8. The oil, gas and water three-phase separation and metering device according to claim 3, characterized in that: The oil phase metering device (7) comprises a first water phase meter and a second water phase meter, the fifth range of the first water phase meter is smaller than the sixth range of the second water phase meter, and the control of the water phase metering device (8) to measure the flow rate of the water phase in the drainage pipeline comprises: opening the first water phase meter and closing the second water phase meter; When it is determined that the flow rate of the water phase reaches the third preset proportion of the fifth measuring range, the first water phase meter is turned off and the second water phase meter is turned on so that the second water phase meter measures the flow rate of the water phase; or When it is determined that the flow rate of the water phase does not reach the third preset proportion of the fifth measuring range, the first water phase meter is controlled to be continuously opened and the second water phase meter is controlled to be continuously closed, so that the first water phase meter measures the flow rate of the water phase.

9. The oil, gas and water three-phase separation and metering device according to claim 2, characterized in that: The oil, gas and water three-phase separation and metering device further includes: A sealing cover assembly, disposed on the top of the first accommodating cavity; A lubricant preventer (11), the upper end of which is inserted into the sealing cover assembly and connected to the oil-gas-water three-phase flow source, and the lower end of which is in the shape of an inverted truncated cone and communicates with the first accommodating section.

10. The oil, gas and water three-phase separation and metering device according to any one of claims 1 to 9, characterized in that: The oil, gas and water three-phase separation metering device further comprises a constant temperature box (6) arranged outside the three-phase separator (3) and used to prevent the oil phase from solidifying.

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