CN110398267B - Oil-water-gas three-phase metering system and metering method for realizing logic control - Google Patents
Oil-water-gas three-phase metering system and metering method for realizing logic control Download PDFInfo
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- CN110398267B CN110398267B CN201910665334.3A CN201910665334A CN110398267B CN 110398267 B CN110398267 B CN 110398267B CN 201910665334 A CN201910665334 A CN 201910665334A CN 110398267 B CN110398267 B CN 110398267B
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- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
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- G—PHYSICS
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- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
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Abstract
The invention provides a three-phase metering system and a metering method for realizing logic control, wherein the oil-water-gas three-phase metering system comprises a multi-stage gas-liquid separation unit; the multistage gas-liquid separation unit comprises at least two gas-liquid separation devices which are sequentially connected, and the gas-liquid separation devices are connected through a liquid electric valve; the gas outlet of the gas-liquid separation device is connected with a gas outlet pipeline, and a gas electric valve and a gas flow detection device are sequentially arranged on the gas outlet pipeline along the gas flow direction; a liquid outlet of the last stage of gas-liquid separation device is connected with a liquid outlet pipeline, and a liquid flow detection device is arranged on the liquid outlet pipeline; and a liquid level monitoring device is arranged in the gas-liquid separation device, and the liquid level monitoring device is matched with a corresponding liquid electric valve to carry out logic control on the liquid level in the gas-liquid separation device. The metering system provided by the invention realizes the organic combination of multi-stage gas-liquid separation and logic control, so that the gas-liquid separation effect is more thorough, and the automatic control metering process is more coherent.
Description
Technical Field
The invention belongs to the technical field of oilfield equipment, relates to a three-phase metering system and a metering method, and particularly relates to an oil-water-gas three-phase metering system and a metering method for realizing logic control.
Background
The united station is the central center of oil field crude oil gathering and processing. The combined station is provided with production devices such as oil transportation, dehydration, sewage treatment, water injection, chemical examination, power transformation, boilers and the like, and mainly has the main functions of three-step dehydration (crude oil dehydration, desalination and desulfurization; natural gas dehydration, deoiling and sewage deoiling), three-step recovery (dirty oil, sewage and light hydrocarbon recovery), four qualified products (natural gas, purified oil, purified sewage and light hydrocarbon) and export of commercial crude oil through the treatment of the crude oil. The united station is a high-temperature, high-pressure, inflammable and explosive place and is a first-grade critical place of an oil field.
The oil, gas and water three-phase metering in the combined station is an important work in the production management of the oil field, and the accurate metering has important guiding significance for the oil well to master the oil reservoir condition and formulate the production scheme. In the metering process, two phases of gas and liquid in a gas-liquid mixture are generally separated, and the flow of the gas is metered by an ultrasonic flowmeter; the flow rate of the separated liquid and the oil-water ratio of the liquid are measured by a mass flowmeter, so that the content ratio of oil, gas and water is obtained.
At present, the two-phase separation method adopted by each oil field mainly separates gas and liquid by a cyclone separation device and utilizing the action of centrifugal force, but in the actual use process of the method, because the effluent and gas outlet conditions of each well and even the same well at different time are different and even greatly fluctuate, the method can not achieve the expected effect; meanwhile, the flow rate of the gas-liquid mixture in the combined station is extremely large, continuous metering is often required, and the existing equipment cannot meet the requirement.
CN207033432U discloses a three-phase metering device, which includes a multi-valve switching assembly and a three-phase metering assembly, wherein the multi-valve switching assembly includes a working chamber, a first outlet and a plurality of valve ports, the first outlet is communicated with a gas-liquid mixing inlet of the three-phase metering assembly, the valve ports are communicated with the working chamber and correspondingly connected with an oil well, a rotating pipe is disposed in the working chamber, one end of the rotating pipe is communicated with the first outlet, and the other end of the rotating pipe can be selectively communicated with one of the valve ports.
CN107882546A discloses a high-water-content low-gas-production oil well liquid production three-phase metering device, which comprises a first-stage cyclone device, a gas core sampling tube, a second-stage cyclone device, a steam trap, a cyclone oil-water separator, a water-blocking filter screen type oil remover, a water filtering pore plate and a separated oil buffer tank which are sequentially connected from bottom to top, wherein the gas core sampling tube is internally provided with the gas-liquid cyclone separator.
However, the comprehensive analysis of the currently known three-phase metering device finds that the three-phase metering device used in the current oil field has the following technical problems:
(1) the problem of incomplete separation exists in the aspect of gas-liquid separation, so that the metering error is large; if the separation can be ensured to be complete, the cost is higher or the installation is difficult.
(2) In the aspect of control, the liquid level is not logically controlled and is allowed to freely flow, so that the flow meter cannot normally measure; or the liquid level control is realized, the whole equipment control logic has the problem of incoherence or unreasonable.
Based on the above technical problems, it is necessary to improve the existing metering device to make up for the defects and shortcomings of the existing metering device.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a three-phase metering system and a metering method for realizing logic control, so that the organic combination of multi-stage gas-liquid separation and logic control is realized, the gas-liquid separation effect is more thorough through the logic cooperation between a liquid level monitoring device and an electric valve, the automatic control metering process is more continuous, and the phenomenon that the metering error of a flow meter is larger or even fails due to overlarge fluid flow is effectively avoided.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a three-phase metering system for realizing logic control, and the oil-water-gas three-phase metering system comprises a multi-stage gas-liquid separation unit.
The multistage gas-liquid separation unit comprises at least two gas-liquid separation devices which are sequentially connected according to a gas-liquid separation process route, and the gas-liquid separation devices are connected through a liquid electric valve.
The gas outlet of the gas-liquid separation device is connected with a gas outlet pipeline, and a gas electric valve and a gas flow detection device are sequentially arranged on the gas outlet pipeline along the gas flow direction.
And a liquid outlet of the last stage of gas-liquid separation device is connected with a liquid outlet pipeline, and a liquid flow detection device is arranged on the liquid outlet pipeline.
And a liquid level monitoring device is arranged in the gas-liquid separation device, and the liquid level monitoring device is matched with the corresponding liquid electric valve and/or gas electric valve to carry out logic control on the liquid level in the gas-liquid separation device.
The metering system provided by the invention realizes the organic combination of multi-stage gas-liquid separation and logic control, the gas-liquid separation effect is more thorough through the logic cooperation between the liquid level monitoring device and the electric valve, the automatic control metering process is more continuous, and the large metering error and even failure of the flow meter caused by the overlarge fluid flow are effectively avoided.
The invention mainly aims to carry out logic control on a multistage separation unit, aims to realize complete gas-liquid separation of oil, water and gas through multistage separation, meets the measuring range requirement of the separated gas-liquid flow adaptive flow detection instrument through logic control, and effectively avoids the occurrence of metering error or instrument damage caused by impact on the gas-liquid flow detection instrument due to overlarge flow; however, the liquid flow detection device (generally adopting a mass flow meter) can detect the mass flow of the oil phase and the water phase respectively, but on the premise that the oil phase and the water phase do not contain gas, the subsequent flow detection can be greatly influenced if the gas and the liquid cannot be effectively and thoroughly separated. Therefore, the invention does not make special requirements on the specific structure, brand and model of the gas flow monitoring device and the gas flow detection device, and can be used in the invention for the commercially available detection instruments which can meet the general requirements. It should be noted that the present invention is not particularly limited to the specific structure of the gas-liquid separation device, and the main point of the present invention is that the connection relationship and the logic control method between the gas-liquid separation devices are based on the multi-stage separation, and the inconvenience and the special emphasis on the internal structure of the gas-liquid separation device are not required.
As a preferred technical solution of the present invention, the multi-stage gas-liquid separation unit includes at least two stages of gas-liquid separation devices connected vertically according to a gas-liquid separation process route.
The number of the gas-liquid separation devices is required to be comprehensively considered according to actual production requirements, construction site limitations, the volume of a gas-liquid mixture to be separated and other practical factors, and the gas-liquid separation devices can be properly selected by a person skilled in the art according to actual conditions.
Preferably, the multi-stage gas-liquid separation unit comprises two vertically connected stages of gas-liquid separation devices according to a gas-liquid separation process route.
Preferably, the upper stage gas-liquid separation device is communicated with the lower stage gas-liquid separation device sequentially through the liquid electric valve and the gas breaking device, and the gas breaking device is used for separating gas from oil in the gas-liquid mixture.
As a preferable technical scheme of the invention, a gas outlet of the first-stage gas-liquid separation device is connected with a one-way valve, and an outlet of the one-way valve is respectively and independently connected with a gas detection pipeline and a gas return pipeline.
Preferably, the gas detection pipeline is provided with a gas electric valve, a gas flow detection device and a gas pressure difference one-way valve in sequence along the gas flow direction.
Preferably, the outlets of the gas return pipelines are respectively and independently connected with the top gas outlets of the gas-liquid separation devices at all stages.
The invention redesigns the connection relationship between each stage of gas-liquid separation device in the gas-liquid separation unit, connects the top gas outlet of each stage of gas-liquid separation device into the gas return pipeline, and matches with logic control to make the gas generated by the separation of the higher stage gas-liquid separation device enter the lower stage gas-liquid separation device through the gas return pipeline to be used as the liquid discharge driving force of the lower stage gas-liquid separation device, and meanwhile, the liquid obtained by separation is smoothly discharged under the action of gravity and gas driving force by combining vertical arrangement, thereby saving conveying equipment.
Preferably, except for the last stage of gas-liquid separation device, top gas outlets of the other stages of gas-liquid separation devices are connected into the gas return pipeline through one-way valves.
The one-way valve guides the gas to flow in one way, so that on one hand, the gas obtained by separation in the lower stage gas-liquid separation device is prevented from flowing back to the upper stage gas-liquid separation device through the gas return pipeline; on the other hand, the gas separated by each stage of gas-liquid separation device can only enter the last stage of gas-liquid separation device but cannot enter the next stage of gas-liquid separation device by arranging the one-way valve, and the gas separated by the rest of the gas-liquid separation devices except the last stage of gas-liquid separation device is converged and then enters the last stage of gas-liquid separation device, so that the driving force is provided for the liquid discharge in the last stage of gas-liquid separation device, and the conveying device is omitted.
It should be noted that the top gas outlet of each stage of gas-liquid separation device may not be provided with a one-way valve, and at this time, the gas separated in the stage of gas-liquid separation device enters each stage of gas-liquid separation device below the stage through a gas return pipeline. The operation mode without the check valve can also realize multi-stage separation and logic control, and finally the technical effect of the invention can also be achieved, therefore, the setting mode also falls into the disclosure and protection scope of the invention.
Preferably, a liquid flow detection device and a one-way valve are sequentially arranged on a liquid outlet pipeline of the last stage of gas-liquid separation device along the liquid flow direction.
As a preferred technical scheme of the invention, the inner wall of the last stage of gas-liquid separation device is provided with an ultimate liquid level monitoring device.
The invention does not have special requirements on the structure, type and size parameters of the final liquid level monitoring device, the function of the device is similar to that of a remote float switch of an electric valve, and the specific functions comprise: (1) sensing the liquid level; (2) and sending a feedback signal to the gas electric valve. The logic control mode is as follows: when the liquid level reaches the final liquid level monitoring device, the final liquid level monitoring device is started, a feedback signal is output to the gas electric valve, and the gas electric valve is triggered to be opened. Therefore, any liquid level monitoring device that satisfies both of the above two functional conditions and the logic control mode can be used in the present invention.
Preferably, the final liquid level monitoring device is electrically connected with the gas electric valve, when the liquid level in the last stage of gas-liquid separation device rises to the final liquid level monitoring device, the gas electric valve is triggered to open, and the gas separated in the last stage of gas-liquid separation device enters the gas detection pipeline through the gas return pipeline.
Preferably, the final liquid level monitoring device is a float switch.
As a preferred technical scheme of the invention, a high liquid level monitoring device and a low liquid level monitoring device are arranged inside the other gas-liquid separation devices at all levels except the last gas-liquid separation device from top to bottom.
The invention does not have special requirements on the structure, type and size parameters of the high liquid level monitoring device and the low liquid level monitoring device. The relative installation position of the high liquid level monitoring device is ensured to be positioned above the low liquid level monitoring device, and the specific installation position is determined by the actual size of the gas-liquid separation device and the flow rate of the gas-liquid mixture to be separated. The function is similar to the remote float switch of an electric valve in terms of function, and specifically, the minimum functions required to be completed include: (1) sensing the liquid level; (2) a feedback signal is sent to the gas/liquid solenoid valve. However, the logic control modes of the high liquid level monitoring device and the low liquid level monitoring device are different, specifically: (1) the logic control mode of the high liquid level monitoring device is as follows: when the liquid level reaches the high liquid level monitoring device, triggering a liquid electric valve connected between the gas-liquid separation device at the current stage and the gas-liquid separation device at the next stage to open, and allowing the liquid separated in the gas-liquid separation device at the current stage to flow into the gas-liquid separation device at the next stage through the liquid electric valve; (2) the logic control mode of the low liquid level monitoring device is as follows: when the liquid level reaches the low liquid level monitoring device, the liquid electric valve and the gas electric valve connected between the gas-liquid separation device at the current stage and the gas-liquid separation device at the next stage are triggered to be closed, the liquid in the gas-liquid separation device at the current stage is blocked from flowing into the gas-liquid separation device at the next stage, and meanwhile, the gas obtained by separation in the gas-liquid separation device at the current stage enters the gas-liquid separation device at the next stage or the final gas-liquid separation device through a gas return pipeline (if a check valve is arranged at the top gas outlet of the gas-liquid separation device at the next stage, the gas enters the final gas-liquid separation device through the return pipeline, and if the check valve is not arranged at the top gas outlet of the gas-. Based on this, any liquid level monitoring device can be used in the present invention as long as it satisfies both the above-mentioned two minimum functional conditions and the logic control manner.
Preferably, the high liquid level monitoring device is electrically connected with the liquid electric valve, when the liquid level in the gas-liquid separation device reaches the high liquid level monitoring device, the liquid electric valve is triggered to open, and the liquid in the gas-liquid separation device flows into the next stage of gas-liquid separation device through the liquid electric valve.
Preferably, the low liquid level monitoring device is respectively and independently electrically connected with the liquid electric valve and the gas electric valve, when the liquid level in the gas-liquid separation device reaches the low liquid level monitoring device, the liquid electric valve and the gas electric valve are triggered to be closed, the liquid in the gas-liquid separation device is blocked from flowing into the next stage of gas-liquid separation device, and the gas obtained by the gas-liquid separation device enters the next stage of gas-liquid separation device through the gas return pipeline.
Preferably, the high liquid level monitoring device and the low liquid level monitoring device are float switches.
As a preferred technical solution of the present invention, the outlet of the gas detection pipeline is connected to the liquid outlet pipeline, and the gas is discharged through the gas detection pipeline and then mixed with the liquid discharged from the liquid outlet pipeline, and then discharged together.
In a second aspect, the invention provides a three-phase metering method for implementing logic control, which adopts the logic-controlled three-phase metering system as described in the first aspect to separate gas and liquid and respectively measure gas and liquid flow.
The three-phase metering method comprises the following steps:
the method comprises the following steps that (I) a gas-liquid mixture enters a first-stage gas-liquid separation device, gas obtained through separation flows through a gas flow device through a gas outlet pipeline to detect the flow of the gas, and liquid obtained through separation flows into a next-stage gas-liquid separation device under the logic control action between a liquid level monitoring device and a liquid electric valve and/or a gas electric valve;
and (II) carrying out a gas-liquid separation process step by step to a last stage gas-liquid separation device according to the logic control relation in the step (I), wherein the gas separated by the last stage gas-liquid separation device flows through a gas flow detection device through a gas outlet pipeline under the logic control action between the liquid level monitoring device and the gas electric valve to detect the flow, and the liquid separated by the last stage gas-liquid separation device flows through the gas flow detection device through the liquid outlet pipeline to detect the flow.
As a preferred technical scheme of the invention, the specific operation process of the logic control action in the step (I) comprises the following steps:
when the liquid level in the first-stage gas-liquid separation device reaches the high liquid level monitoring device, the electric valve communicated with the next-stage gas-liquid separation device is opened, and the liquid separated in the first-stage gas-liquid separation device flows into the next-stage gas-liquid separation device through the electric valve and the gas breaking device in sequence;
when the liquid level in the first stage gas-liquid separation device drops to the low liquid level monitoring device, the liquid electric valve and the gas electric valve which are communicated with the next stage gas-liquid separation device are closed, and gas obtained by separation in the first stage gas-liquid separation device enters the next stage gas-liquid separation device through the gas return pipeline.
As a preferred technical solution of the present invention, the specific operation process of the logic control action in step (ii) includes:
when the liquid level in the last stage of gas-liquid separation device rises to the final liquid level detection device, the gas electric valve is triggered to open, the separated gas enters the gas detection pipeline through the gas return pipeline, the gas flows through the gas flow detection device to detect the flow, and the separated liquid flows through the gas flow detection device through the liquid outlet pipeline to detect the flow.
In a preferred embodiment of the present invention, after the step (ii), the gas discharged from the gas detection line and the liquid discharged from the liquid outlet line are mixed and then recovered in a unified manner.
The system refers to an equipment system, or a production equipment.
Compared with the prior art, the invention has the beneficial effects that:
(1) the metering system provided by the invention realizes the organic combination of multi-stage gas-liquid separation and logic control, the gas-liquid separation effect is more thorough through the logic cooperation between the liquid level monitoring device and the electric valve, the automatic control metering process is more continuous, and the large metering error and even failure of the flow meter caused by the overlarge fluid flow are effectively avoided.
(2) The invention redesigns the connection relationship between each stage of gas-liquid separation device in the gas-liquid separation unit, uses the gas separated by the higher stage gas-liquid separation device as the liquid discharge driving force of the lower stage gas-liquid separation device by matching with logic control, and simultaneously combines the vertical arrangement, so that the liquid obtained by separation can be smoothly discharged under the action of gravity and gas driving force, thereby saving conveying equipment.
Drawings
Fig. 1 is a schematic structural diagram of a two-stage separated three-phase metering system capable of implementing logic control according to embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of a three-phase metering system capable of implementing three-level separation of logic control according to embodiment 2 of the present invention;
wherein, 1-a first gas-liquid separation device; 2-first liquid electric valve; 3-a gas breaking device; 4-a second gas-liquid separation device; 5-second liquid electric valve; 6-a third gas-liquid separation device; 7-a first one-way valve; 8-a second one-way valve; 9-gas detection pipeline; 10-gas return line; 11-gas electric valve; 12-gas flow detection means; 13-differential gas pressure check valve; 14-liquid flow detection means; 15-a third one-way valve; 16-a liquid outlet line; 17-a gas-liquid mixture inlet; 18-a first high level monitoring device; 19-a first low level monitoring device; 20-a second high level monitoring device; 21-a second low level monitoring device; 22-final liquid level monitoring device.
Detailed Description
It should be noted that the numerical terms "first", "second", etc. used in the detailed description are mainly used for distinguishing gas-liquid separation devices or check valves of the same type and are not to be construed as indicating or implying relative importance or implicitly indicating the number of devices indicated. Thus, a gas-liquid separation device or a check valve defined by the terms "first," "second," etc. may explicitly or implicitly include one or more of these features.
Furthermore, unless expressly stated or limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
In one embodiment, the invention provides a three-phase metering system for realizing logic control, wherein the three-phase metering system is shown in fig. 1 and fig. 2 and comprises a multi-stage gas-liquid separation unit, and the multi-stage gas-liquid separation unit comprises at least two gas-liquid separation devices which are vertically connected according to a gas-liquid separation process route. Illustratively, the multi-stage gas-liquid separation unit shown in fig. 1 includes two gas-liquid separation devices connected in sequence, and the multi-stage gas-liquid separation unit shown in fig. 2 includes three gas-liquid separation devices connected in sequence, but the number of the gas-liquid separation devices is not limited to the number shown in the drawings, and those skilled in the art should determine the number of the gas-liquid separation devices according to the volume of the gas-liquid mixture to be separated. The purpose of vertical connection is to omit a transfer pump communicated between each stage of gas-liquid separation device, and liquid separated in the upper stage gas-liquid separation device can flow into the lower stage gas-liquid separation device under the action of gravity.
The upper-level gas-liquid separation device is communicated with the lower-level gas-liquid separation device sequentially through the liquid electric valve and the gas breaking device 3, and the gas breaking device 3 is used for separating gas from oil in the gas-liquid mixture. The first stage gas-liquid separation device and the second stage gas-liquid separation device are connected with the gas breaking device 3 through a liquid electric valve, and the rest gas-liquid separation devices at all stages can be connected through liquid electric valves only.
The gas outlet of the first stage gas-liquid separation device is connected with a one-way valve, and the outlet of the one-way valve is respectively and independently connected with a gas detection pipeline 9 and a gas return pipeline 10. Wherein, a gas electric valve 11, a gas flow detection device 12 and a gas pressure difference one-way valve 13 are sequentially arranged on the gas detection pipeline 9 along the gas flow direction; the outlets of the gas return pipelines 10 are respectively and independently connected with the top gas outlets of all stages of gas-liquid separation devices, and the top gas outlets of the other stages of gas-liquid separation devices except the last stage of gas-liquid separation device are all connected into the gas return pipelines 10 through one-way valves. A liquid flow detection device 14 and a one-way valve are sequentially arranged on a liquid outlet pipeline 16 of the last stage of gas-liquid separation device along the liquid flow direction.
And an ultimate liquid level monitoring device 22 is arranged on the inner wall of the shell of the last stage of gas-liquid separation device, the ultimate liquid level monitoring device 22 is electrically connected with the gas electric valve 11, when the liquid level in the last stage of gas-liquid separation device rises to the ultimate liquid level monitoring device 22, the gas electric valve 11 is triggered to be opened, and the gas obtained by separation in the last stage of gas-liquid separation device enters the gas detection pipeline 9 through the gas return pipeline 10. In this embodiment, an optional final fluid level monitoring device 22 is a float switch.
The inner walls of the shells of all the other stages of gas-liquid separation devices except the last stage of gas-liquid separation device are sequentially provided with a high liquid level monitoring device and a low liquid level monitoring device from top to bottom. When the liquid level in the gas-liquid separation device reaches the high liquid level monitoring device, the liquid electric valve communicated with the next stage of gas-liquid separation device is triggered to open (it needs to be explained that when the metering system is in an initial state, the liquid electric valves at all stages are in a closed state), and the liquid in the gas-liquid separation device flows into the next stage of gas-liquid separation device through the liquid electric valve; the low liquid level monitoring device is respectively and independently electrically connected with the liquid electric valve and the gas electric valve 11, when the liquid level in the gas-liquid separation device reaches the low liquid level monitoring device, the liquid electric valve and the gas electric valve 11 are triggered to be closed, the liquid in the gas-liquid separation device is blocked from flowing into the next stage of gas-liquid separation device, and the gas obtained by the gas-liquid separation device enters the next stage of gas-liquid separation device through the gas backflow pipeline 10. In this embodiment, one optional high and low level monitoring devices is a float switch.
The outlet of the gas detection pipeline 9 is connected with the liquid outlet pipeline 16, and the gas is discharged through the gas detection pipeline 9 and then is mixed with the liquid discharged from the liquid outlet pipeline 16 and then is discharged together.
In another embodiment, the invention provides a three-phase metering method for realizing logic control, which adopts the three-phase metering system for realizing logic control to separate gas and liquid and respectively measure the gas and liquid flow.
The three-phase metering method comprises the following steps:
the method comprises the following steps that (I) a gas-liquid mixture enters a first-stage gas-liquid separation device, gas obtained through separation flows through a gas flow device through a gas outlet pipeline to detect the flow rate of the gas, at the moment, liquid obtained through gas-liquid separation is continuously accumulated in the first-stage gas-liquid separation device because a liquid electric valve is in a closed state until the liquid level in the first-stage gas-liquid separation device reaches a high liquid level monitoring device, the electric valve communicated with a next-stage gas-liquid separation device is triggered to be opened, and the liquid obtained through separation in the first-stage gas-liquid separation device sequentially flows into the next-stage gas-liquid separation device through the; the liquid level in the first-stage gas-liquid separation device gradually drops along with the liquid in the first-stage gas-liquid separation device flowing into the next-stage gas-liquid separation device, when the liquid level in the first-stage gas-liquid separation device drops to the low liquid level monitoring device, the liquid electric valve and the gas electric valve 11 which are communicated with the next-stage gas-liquid separation device are closed, and the gas obtained by separation in the first-stage gas-liquid separation device enters the next-stage gas-liquid separation device through the gas return pipeline 10;
and (II) carrying out the gas-liquid separation process step by step according to the logic control relation in the step (I) until the process is carried out to the last stage of gas-liquid separation device, wherein the liquid level in the last stage of gas-liquid separation device gradually rises along with the flow of the liquid in the last stage of gas-liquid separation device into the last stage of gas-liquid separation device, when the liquid level rises to the final liquid level detection device, the gas electric valve 11 is triggered to be opened, the gas separated in the last stage of gas-liquid separation device enters the gas detection pipeline 9 through the gas return pipeline 10, the flow of the gas flows through the gas flow detection device 12 to detect the flow, and the separated liquid flows through the gas flow detection device 12 through the liquid outlet pipeline 16 to detect the flow and the oil-water ratio.
And (3) after the step (II) is finished, mixing the gas discharged from the gas detection pipeline 9 with the liquid discharged from the liquid outlet pipeline 16, and then uniformly recovering and discharging the gas.
Example 1
The invention provides a three-phase metering system capable of realizing two-stage separation of logic control, which comprises a multi-stage gas-liquid separation unit as shown in figure 1, wherein the multi-stage gas-liquid separation unit comprises a first gas-liquid separation device 1 and a third gas-liquid separation device 6 which are vertically connected according to a gas-liquid separation process route.
The first gas-liquid separation device 1 is connected with the third gas-liquid separation device 6 sequentially through the first liquid electric valve 2 and the gas breaking device 3, and the gas breaking device 3 is used for separating gas from oil in the gas-liquid mixture.
The top gas outlet of the first gas-liquid separation device 1 is connected with a first one-way valve 7, and the outlet of the first one-way valve 7 is respectively and independently connected with a gas detection pipeline 9 and a gas return pipeline 10. Wherein, a gas electric valve 11, a gas flow detection device 12 and a gas pressure difference one-way valve 13 are sequentially arranged on the gas detection pipeline 9 along the gas flow direction; the outlet of the gas return pipeline 10 is connected with the top gas outlet of the third gas-liquid separation device 6. A gas-liquid mixture inlet 17 is arranged above the shell of the first gas-liquid separation device 1. The inner wall of the shell of the first gas-liquid separation device 1 is sequentially provided with a first high liquid level monitoring device 18 and a first low liquid level monitoring device 19 from top to bottom. The first high liquid level monitoring device 18 is electrically connected to the first liquid electric valve 2, when the liquid level in the first gas-liquid separation device 1 reaches the first high liquid level monitoring device 18, the first liquid electric valve 2 is triggered to open (it should be noted that when the metering system is in an initial state, the first liquid electric valve 2 is in a closed state), and the liquid in the first gas-liquid separation device 1 flows into the third gas-liquid separation device 6 through the first liquid electric valve 2. The first low liquid level monitoring device 19 is respectively and independently electrically connected with the first liquid electric valve 2 and the gas electric valve 11, when the liquid level in the first gas-liquid separation device 1 reaches the first low liquid level monitoring device 19, the first liquid electric valve 2 and the gas electric valve 11 are triggered to be closed, the liquid in the first gas-liquid separation device 1 is blocked from flowing into the third gas-liquid separation device 6, and the gas obtained by separation in the first gas-liquid separation device 1 sequentially passes through the first check valve 7 and the gas backflow pipeline 10 to enter the third gas-liquid separation device 6. The first high liquid level monitoring device 18 and the first low liquid level monitoring device 19 used in this embodiment are both float switches.
A liquid outlet of the third liquid-gas separation device is connected with a liquid outlet pipeline 16, and a liquid flow detection device 14 and a third check valve 15 are sequentially arranged on the liquid outlet pipeline 16 along the liquid flow direction. An ultimate liquid level monitoring device 22 is arranged on the inner wall of the shell of the third-stage gas-liquid separation device, the ultimate liquid level monitoring device 22 is electrically connected with the gas electric valve 11, when the liquid level in the third gas-liquid separation device 6 rises to the ultimate liquid level monitoring device 22, the gas electric valve 11 is triggered to be opened (at the moment, the first liquid electric valve 2 still keeps a closed state), gas obtained by separation in the third gas-liquid separation device 6 enters the gas detection pipeline 9 through the gas return pipeline 10 and flows through the gas flow detection device 12 to detect the flow of the gas, and the ultimate liquid level monitoring device 22 adopted in the embodiment is a float switch.
The outlet of the gas detection pipeline 9 is connected to a liquid outlet pipeline 16, and gas is discharged through the gas detection pipeline 9 and then is mixed with liquid discharged from the liquid outlet pipeline 16 and then is discharged together.
Application example 1
The two-stage separation three-phase metering system capable of realizing logic control provided by embodiment 1 is adopted to separate gas-liquid mixtures and respectively measure gas-liquid flow, and the metering method specifically comprises the following steps:
first-stage gas-liquid separation: gas 2000m345m of oil-water mixture3(wherein the oil is 20m325m of water3) The gas-liquid mixture enters the first gas-liquid separation device 1 through the gas-liquid mixture inlet 17, the gas obtained by separation enters the gas detection pipeline 9 through the first check valve 7, the gas flows through the gas electric valve 11, the gas flow detection device 12 and the gas pressure difference check valve 13 in the gas detection pipeline 9 in sequence and then is discharged, and the gas flows through the gasThe gas flow is detected by the body flow detecting device 12; in the process of gas-liquid separation of the first gas-liquid separation device 1, the first liquid electric valve 2 is in a closed state, liquid obtained by gas-liquid separation is continuously accumulated in the first gas-liquid separation device 1 until the liquid level of the liquid in the first gas-liquid separation device 1 reaches the first high liquid level monitoring device 18, the first liquid electric valve 2 is triggered to be opened, and the liquid obtained by separation in the first gas-liquid separation device 1 sequentially flows into the third gas-liquid separation device 6 through the first liquid electric valve 2 and the gas breaking device 3; along with the liquid in the first gas-liquid separation device 1 gradually flows into the third gas-liquid separation device 6, the liquid level in the first gas-liquid separation device 1 gradually decreases until the liquid level decreases to the first low liquid level monitoring device 19, the first liquid electric valve 2 and the gas electric valve 11 are triggered to be closed, the gas obtained by separation in the first gas-liquid separation device 1 enters the third gas-liquid separation device 6 through the first one-way valve 7 through the gas backflow pipeline 10, and driving force is provided for the discharge of the liquid in the third gas-liquid separation device 6;
(II) secondary gas-liquid separation: along with the liquid in the first gas-liquid separation device 1 gradually flows into the third gas-liquid separation device 6, the liquid level in the third gas-liquid separation device 6 rises, when the liquid level rises to the final liquid level monitoring device 22, the gas electric valve 11 is triggered to be opened (at the moment, the first liquid electric valve 2 is still closed), the gas separated in the third gas-liquid separation device 6 enters the gas detection pipeline 9 through the gas return pipeline 10, the gas flow passes through the gas flow detection device 12 to detect the gas flow, and the liquid separated flows through the gas flow detection device 12 through the liquid outlet pipeline 16 and detects the flow rate of the mixed liquid and the oil-water ratio in the mixed liquid.
And (3) after the step (II) is finished, uniformly recycling the gas discharged from the gas detection pipeline 9 and the liquid discharged from the liquid outlet pipeline 16 after mixing.
Sampling inspection is carried out after multiple operations, and the gas-liquid separation efficiency reaches more than 99 percent; and (3) sampling and testing the separated gas and mixed liquor in a laboratory, and comparing the gas and mixed liquor with volume data of a gas-liquid mixture obtained by sampling in an oil field to obtain the gas-liquid mixed liquor, wherein the volume error of the gas is 1%, the volume error of the mixed liquor is 0.2%, and the water-containing volume error is 2%.
Example 2
The invention provides a three-phase metering system capable of realizing three-level gas-liquid separation and realizing logic control, wherein the three-phase metering system comprises a multi-stage gas-liquid separation unit as shown in figure 2, and the multi-stage gas-liquid separation unit comprises a first gas-liquid separation device 1, a second gas-liquid separation device 4 and a third gas-liquid separation device 6 which are vertically connected according to a gas-liquid separation process route.
The first gas-liquid separation device 1 is connected with the second gas-liquid separation device 4 sequentially through the first liquid electric valve 2 and the gas breaking device 3, and the gas breaking device 3 is used for separating gas from oil in the gas-liquid mixture. The second gas-liquid separation device 4 is connected to a third gas-liquid separation device 6 via a second liquid electric valve 5.
The top gas outlet of the first gas-liquid separation device 1 is connected with a first one-way valve 7, and the outlet of the first one-way valve 7 is respectively and independently connected with a gas detection pipeline 9 and a gas return pipeline 10. Wherein, a gas electric valve 11, a gas flow detection device 12 and a gas pressure difference one-way valve 13 are sequentially arranged on the gas detection pipeline 9 along the gas flow direction; the outlets of the gas return pipeline 10 are respectively and independently connected with the top gas outlets of the second gas-liquid separation device 4 and the third gas-liquid separation device 6, wherein the top gas outlet of the second gas-liquid separation device 4 is connected into the gas return pipeline 10 through a second one-way valve 8. A gas-liquid mixture inlet 17 is arranged above the shell of the first gas-liquid separation device 1. The inner wall of the shell of the first gas-liquid separation device 1 is sequentially provided with a first high liquid level monitoring device 18 and a first low liquid level monitoring device 19 from top to bottom. The first high liquid level monitoring device 18 is electrically connected to the first liquid electric valve 2, when the liquid level in the first gas-liquid separation device 1 reaches the first high liquid level monitoring device 18, the first liquid electric valve 2 is triggered to open (it should be noted that when the metering system is in an initial state, the first liquid electric valve 2 is in a closed state), and the liquid in the first gas-liquid separation device 1 flows into the second gas-liquid separation device 4 through the first liquid electric valve 2. The first low liquid level monitoring device 19 is respectively and independently electrically connected with the first liquid electric valve 2 and the gas electric valve 11, when the liquid level in the first gas-liquid separation device 1 reaches the first low liquid level monitoring device 19, the first liquid electric valve 2 and the gas electric valve 11 are triggered to be closed, the liquid in the first gas-liquid separation device 1 is blocked from flowing into the second gas-liquid separation device 4, the gas separated in the first gas-liquid separation device 1 sequentially passes through the first check valve 7 and the gas return pipeline 10 to enter the third gas-liquid separation device 6 (the gas separated in the first gas-liquid separation device 1 cannot enter the second gas-liquid separation device 4 through the gas return pipeline 10 due to the one-way drainage function of the second check valve 8. of course, an optional technical scheme is that the second check valve 8 is omitted, and the gas separated in the first gas-liquid separation device 1 at the moment can respectively enter the second gas-liquid separation device 4 and the third gas separation device through the gas return pipeline 10 In fig. 6, the alternative solution also falls within the disclosure and protection scope of the present invention, but is not limited by space, and a separate embodiment is not provided for the alternative solution). The first high liquid level monitoring device 18 and the first low liquid level monitoring device 19 used in this embodiment are both float switches.
The inner wall of the shell of the second gas-liquid separation device 4 is sequentially provided with a second high liquid level monitoring device 20 and a second low liquid level monitoring device 21 from top to bottom. The second high liquid level monitoring device 20 is electrically connected to the second liquid electric valve 5, when the liquid level in the second gas-liquid separation device 4 reaches the second high liquid level monitoring device 20, the second liquid electric valve 5 is triggered to open (it should be noted that when the metering system is in the initial state, the second liquid electric valve 5 is in the closed state), and the liquid in the second gas-liquid separation device 4 flows into the third gas-liquid separation device 6 through the second liquid electric valve 5. The second low liquid level monitoring device 21 is respectively and independently electrically connected with the second liquid electric valve 5 and the gas electric valve 11, when the liquid level in the second gas-liquid separation device 4 reaches the second low liquid level monitoring device 21, the second liquid electric valve 5 and the gas electric valve 11 are triggered to be closed, the liquid in the second gas-liquid separation device 4 is blocked from flowing into the third gas-liquid separation device 6, the gas obtained by separation in the second gas-liquid separation device 4 enters the gas return pipeline 10 through the second check valve 8, and then enters the third gas-liquid separation device 6 through the gas return pipeline 10. The first high liquid level monitoring device 18 and the first low liquid level monitoring device 19 used in this embodiment are both float switches.
A liquid outlet at the bottom of the third gas-liquid separation device 6 is connected with a liquid outlet pipeline 16, and a liquid flow detection device 14 and a third one-way valve 15 are sequentially arranged on the liquid outlet pipeline 16 along the liquid flow direction. An ultimate liquid level monitoring device 22 is arranged on the inner wall of the shell of the third-stage gas-liquid separation device, the ultimate liquid level monitoring device 22 is electrically connected with the gas electric valve 11, when the liquid level in the third gas-liquid separation device 6 rises to the ultimate liquid level monitoring device 22, the gas electric valve 11 is triggered to be opened, and gas obtained by separation in the third gas-liquid separation device 6 enters the gas detection pipeline 9 through the gas return pipeline 10 and flows through the gas detection device to detect the flow rate of the mixed liquid and the oil-water ratio in the mixed liquid. In the present embodiment, the final liquid level monitoring device 22 is a float switch.
The outlet of the gas detection pipeline 9 is connected with the liquid outlet pipeline 16, and gas is discharged through the gas detection pipeline 9 and then is mixed with liquid discharged from the liquid outlet pipeline 16 and then is discharged together.
Application example 2
The three-phase metering system which can realize the three-stage separation of the logic control and is provided by the embodiment 2 is adopted to separate the gas-liquid mixture and respectively measure the gas-liquid flow; the metering method specifically comprises the following steps:
first-stage gas-liquid separation: comprises 3000m3Gas sum of 60m3Oil-water mixture (oil 25 m)335m of water3) The gas-liquid mixture enters the first gas-liquid separation device 1 through the gas-liquid mixture inlet 17, the gas-liquid mixture is subjected to a primary gas-liquid separation process in the first gas-liquid separation device 1, the separated gas enters the gas detection pipeline 9 through the first check valve 7, the gas flows through the gas electric valve 11, the gas flow detection device 12 and the gas pressure difference check valve 13 in the gas detection pipeline 9 in sequence and then is discharged, and the gas flow is detected when the gas flows through the gas flow detection device 12; in the process of gas-liquid separation of the first gas-liquid separation device 1, the first liquid electric valve 2 is in a closed state, and the liquid obtained by gas-liquid separation is continuously in the first gas-liquid separation device 1Accumulating until the liquid level in the first gas-liquid separation device 1 reaches the first high liquid level monitoring device 18, triggering the first liquid electric valve 2 to open, and allowing the liquid separated in the first gas-liquid separation device 1 to flow into the second gas-liquid separation device 4 through the first liquid electric valve 2 and the gas breaking device 3 in sequence; along with the liquid in the first gas-liquid separation device 1 gradually flows into the second gas-liquid separation device 4, the liquid level in the first gas-liquid separation device 1 gradually decreases until the liquid level drops to the first low liquid level monitoring device 19, the first liquid electric valve 2 and the gas electric valve 11 are triggered to be closed, the gas obtained by separation in the first gas-liquid separation device 1 enters the third gas-liquid separation device 6 through the first one-way valve 7 through the gas backflow pipeline 10, and driving force is provided for the discharge of the liquid in the third gas-liquid separation device 6;
(II) secondary gas-liquid separation: liquid separated in the first gas-liquid separation device 1 flows into the second gas-liquid separation device 4 through the first liquid electric valve 2 and the gas breaking device 3, a secondary gas-liquid separation process is carried out in the second gas-liquid separation device 4, gas obtained by separation enters the gas detection pipeline 9 through the second one-way valve 8 and the gas return pipeline 10, the gas flows through the gas electric valve 11, the gas flow detection device 12 and the gas pressure difference one-way valve 13 in sequence in the gas detection pipeline 9 and then is discharged, and gas flow is detected when the gas flows through the gas flow detection device 12; in the process of gas-liquid separation of the second gas-liquid separation device 4, the second liquid electric valve 5 is in a closed state, liquid obtained by gas-liquid separation is continuously accumulated in the second gas-liquid separation device 4 until the liquid level in the second stage gas-liquid separation device reaches the second high liquid level monitoring device 20, the second liquid electric valve 5 is triggered to be opened, and the liquid obtained by separation in the second gas-liquid separation device 4 flows into the third gas-liquid separation device 6 through the second liquid electric valve 5; along with the liquid in the second gas-liquid separation device 4 gradually flows into the third gas-liquid separation device 6, the liquid level in the second gas-liquid separation device 4 gradually drops, and when the liquid level drops to the second low liquid level monitoring device 21, the second liquid electric valve 5 and the gas electric valve 11 are triggered to be closed, the gas separated in the second gas-liquid separation device 4 enters the third gas-liquid separation device 6 through the second one-way valve 8 and the gas return pipeline 10, and a driving force is provided for the liquid discharge in the third gas-liquid separation device 6;
(III) three-stage gas-liquid separation: along with the liquid in the second gas-liquid separation device 4 gradually flows into the third gas-liquid separation device 6, the liquid level in the third gas-liquid separation device 6 rises, when the liquid level rises to the final liquid level monitoring device 22, the gas electric valve 11 is triggered to be opened, the gas separated in the third gas-liquid separation device 6 enters the gas detection pipeline 9 through the gas return pipeline 10, the gas flow rate is detected when the gas flows through the gas flow rate detection device 12, and the separated liquid flows through the gas flow rate detection device 12 through the liquid outlet pipeline 16 to detect the flow rate of the mixed liquid and the proportion of oil and water in the mixed liquid.
And (3) after the step (III) is finished, uniformly recycling the gas discharged from the gas detection pipeline 9 and the liquid discharged from the liquid outlet pipeline 16 after mixing.
Sampling inspection is carried out after multiple operations, and the gas-liquid separation efficiency reaches more than 99 percent; and (3) sampling and testing the separated gas and mixed liquor in a laboratory, and comparing the gas and mixed liquor with volume data of a gas mixture in a gas-liquid mixture obtained by sampling in an oil field to obtain the gas-liquid mixed liquor, wherein the volume error of the gas is 1.2%, the volume error of the mixed liquor is 0.4%, and the water-containing volume error is 3%.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (18)
1. An oil-water-gas three-phase metering system for realizing logic control is characterized by comprising a multi-stage gas-liquid separation unit;
the multistage gas-liquid separation unit comprises at least two gas-liquid separation devices which are sequentially connected according to a gas-liquid separation process route, and the gas-liquid separation devices are connected through a liquid electric valve;
the gas outlet of the gas-liquid separation device is connected with a gas outlet pipeline, and a gas electric valve and a gas flow detection device are sequentially arranged on the gas outlet pipeline along the gas flow direction;
a liquid outlet of the last stage of gas-liquid separation device is connected with a liquid outlet pipeline, and a liquid flow detection device is arranged on the liquid outlet pipeline;
a liquid level monitoring device is arranged in the gas-liquid separation device, and the liquid level monitoring device is matched with a corresponding liquid electric valve and/or a gas electric valve to carry out logic control on the liquid level in the gas-liquid separation device;
the oil-water-gas three-phase metering system is adopted to separate gas and liquid and respectively measure gas-liquid flow, and comprises the following steps:
the method comprises the following steps that (I) a gas-liquid mixture enters a first-stage gas-liquid separation device, gas obtained through separation flows through a gas flow device through a gas outlet pipeline to detect the flow of the gas, and liquid obtained through separation flows into a next-stage gas-liquid separation device under the logic control action between a liquid level monitoring device and a liquid electric valve and/or a gas electric valve;
wherein, the specific operation process of the logic control action in the step (I) comprises the following steps:
when the liquid level in the first-stage gas-liquid separation device reaches the high liquid level monitoring device, the electric valve communicated with the next-stage gas-liquid separation device is opened, and the liquid separated in the first-stage gas-liquid separation device flows into the next-stage gas-liquid separation device through the electric valve and the gas breaking device in sequence; when the liquid level in the first stage gas-liquid separation device drops to the low liquid level monitoring device, the liquid electric valve and the gas electric valve which are communicated with the next stage gas-liquid separation device are closed, and gas obtained by separation in the first stage gas-liquid separation device enters the next stage gas-liquid separation device through a gas return pipeline;
(II) the gas-liquid separation process is carried out step by step to the last stage of gas-liquid separation device according to the logic control relation in the step (I), the gas separated by the last stage of gas-liquid separation device flows through the gas flow detection device through the gas outlet pipeline under the logic control action between the liquid level monitoring device and the gas electric valve to detect the flow, and the liquid separated by the last stage of gas-liquid separation device flows through the gas flow detection device through the liquid outlet pipeline to detect the flow;
wherein, the specific operation process of the logic control action in the step (II) comprises the following steps:
when the liquid level in the last stage of gas-liquid separation device rises to the final liquid level detection device, the gas electric valve is triggered to open, the separated gas enters the gas detection pipeline through the gas return pipeline, the gas flows through the gas flow detection device to detect the gas flow, and the separated liquid flows through the liquid flow detection device through the liquid outlet pipeline to detect the liquid flow and the oil-water ratio.
2. The oil-water-gas three-phase metering system realizing logic control as claimed in claim 1, wherein the multi-stage gas-liquid separation unit comprises at least two stages of gas-liquid separation devices which are vertically connected according to a gas-liquid separation process route.
3. The oil-water-gas three-phase metering system realizing logic control as claimed in claim 2, wherein the multi-stage gas-liquid separation unit comprises two vertically connected stages of gas-liquid separation devices according to a gas-liquid separation process route.
4. The oil-water-gas three-phase metering system achieving logic control as claimed in claim 1, wherein the upper-level gas-liquid separation device is communicated with the lower-level gas-liquid separation device sequentially through a liquid electric valve and a gas breaking device, and the gas breaking device is used for separating gas from oil in a gas-liquid mixture.
5. The oil-water-gas three-phase metering system achieving logic control as claimed in claim 1, wherein a gas outlet of the first-stage gas-liquid separation device is connected with a one-way valve, and an outlet of the one-way valve is respectively and independently connected with a gas detection pipeline and a gas return pipeline.
6. The oil-water-gas three-phase metering system realizing logic control as claimed in claim 1, wherein a gas electric valve, a gas flow detection device and a gas pressure difference check valve are sequentially arranged on the gas detection pipeline along a gas flow direction.
7. The oil-water-gas three-phase metering system for realizing logic control according to claim 1, wherein outlets of the gas return pipelines are respectively and independently connected with gas outlets at the tops of the gas-liquid separation devices of all stages.
8. The oil-water-gas three-phase metering system for realizing logic control according to claim 1, wherein gas outlets at the top of all stages of gas-liquid separation devices except the last stage of gas-liquid separation device are connected to the gas return pipeline through one-way valves.
9. The oil-water-gas three-phase metering system achieving logic control as claimed in claim 1, wherein a liquid flow detection device and a one-way valve are sequentially arranged on a liquid outlet pipeline of the last stage of gas-liquid separation device along a liquid flow direction.
10. The oil-water-gas three-phase metering system achieving logic control as claimed in claim 1, wherein a final liquid level monitoring device is arranged on an inner wall of the last stage of gas-liquid separation device.
11. The oil-water-gas three-phase metering system achieving logic control as claimed in claim 1, wherein the final liquid level monitoring device is electrically connected with the gas electric valve, when the liquid level in the last stage of gas-liquid separation device rises to the final liquid level monitoring device, the gas electric valve is triggered to open, and gas separated from the last stage of gas-liquid separation device enters the gas detection pipeline through the gas return pipeline.
12. The oil, water and gas three-phase metering system realizing logic control as claimed in claim 1, wherein the final liquid level monitoring device is a float switch.
13. The oil-water-gas three-phase metering system achieving logic control as claimed in claim 1, wherein a high liquid level monitoring device and a low liquid level monitoring device are arranged inside each of the gas-liquid separation devices except the last gas-liquid separation device from top to bottom.
14. The oil-water-gas three-phase metering system realizing logic control as claimed in claim 1, wherein the high liquid level monitoring device is electrically connected with a liquid electric valve, when the liquid level in the gas-liquid separation device reaches the high liquid level monitoring device, the liquid electric valve is triggered to open, and the liquid in the gas-liquid separation device flows into the next stage of gas-liquid separation device through the liquid electric valve.
15. The oil-water-gas three-phase metering system achieving logic control as claimed in claim 1, wherein the low liquid level monitoring device is electrically connected with the liquid electric valve and the gas electric valve independently, when the liquid level in the gas-liquid separation device reaches the low liquid level monitoring device, the liquid electric valve and the gas electric valve are triggered to be closed, the liquid in the gas-liquid separation device is blocked from flowing into the next stage of gas-liquid separation device, and the gas separated by the gas-liquid separation device enters the next stage of gas-liquid separation device through a gas return pipeline.
16. The oil, water and gas three-phase metering system realizing logic control as claimed in claim 1, wherein the high liquid level monitoring device and the low liquid level monitoring device are float switches.
17. The oil-water-gas three-phase metering system for realizing logic control according to claim 1, wherein an outlet of the gas detection pipeline is connected to the liquid outlet pipeline, and gas is discharged through the gas detection pipeline and then mixed with liquid discharged from the liquid outlet pipeline and then discharged together.
18. The oil-water-gas three-phase metering system realizing logic control as claimed in claim 1, wherein after step (II) is finished, the gas discharged from the gas detection pipeline is mixed with the liquid discharged from the liquid outlet pipeline and then discharged.
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