CN115506775B - Oil-water-gas multiphase flow array measurement device and its application - Google Patents
Oil-water-gas multiphase flow array measurement device and its application Download PDFInfo
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- CN115506775B CN115506775B CN202211162010.6A CN202211162010A CN115506775B CN 115506775 B CN115506775 B CN 115506775B CN 202211162010 A CN202211162010 A CN 202211162010A CN 115506775 B CN115506775 B CN 115506775B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/34—Arrangements for separating materials produced by the well
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Abstract
本发明涉及油水气三相流体测量设备制造技术领域，具体的说是一种结构合理、成本低的油水气多相流阵列式测量装置及其应用，其特征在于，在位于所述油井产出液输入口(101)下方的油井产出液输入管路(4)上设有三通接头(45)，三通接头(45)的一路输出端通过进液管路(401)与油井产出液输入口(101)相连，另一路输出端通过旁通管路(5)与排液管路(2)相连，或与排气排液汇流管路相连，所述排气排液汇流管路为排液管路与排气管路汇流后的管路；与传统的泵排方案相比，在明显减小结构复杂性和装置造价的前提下，利用三相流自身析出气体和控制流程，实现了计量罐的排空排净，保证了用阵列式方法测量油水比例以及液、气量的准确、稳定。
The present invention relates to the technical field of manufacturing equipment for measuring oil, water and gas three-phase fluids, and in particular to an array-type measuring device for measuring oil, water and gas multiphase flow with reasonable structure and low cost and its application, characterized in that a three-way joint (45) is provided on an oil well output liquid input pipeline (4) located below the oil well output liquid input port (101), one output end of the three-way joint (45) is connected to the oil well output liquid input port (101) through a liquid inlet pipeline (401), and the other output end is connected to a drainage pipeline (2) or an exhaust and drainage confluence pipeline through a bypass pipeline (5), wherein the exhaust and drainage confluence pipeline is a pipeline after the drainage pipeline and the exhaust pipeline are confluenced; compared with a traditional pump discharge scheme, under the premise of significantly reducing the structural complexity and the device cost, the three-phase flow itself precipitates gas and controls the process flow, so as to realize the emptying and cleaning of the metering tank, thereby ensuring the accuracy and stability of measuring the oil-water ratio and the liquid and gas volume by an array method.
Description
Technical field:
the invention relates to the technical field of oil-water-gas three-phase fluid measurement equipment manufacture, in particular to an oil-water-gas multiphase flow array type measurement device with reasonable structure and low cost and application thereof.
The background technology is as follows:
In petroleum production, accurate and stable monitoring of oil, water and gas phases is the basis of oilfield income increasing and cost saving and digital production. An automatic measurement technology at home and abroad does not exist, the technology can meet the requirements of the production by measuring the liquid amount of a tank and gas and manually sampling and measuring the water content basically by taking time and labor, and the acceptable cost performance product can be popularized in the changeable environment of an oilfield, as in the technical scheme described in patent CN200520123346.7 and the like.
The inventor of the present patent proposes a Chinese patent 201280001771.1 to propose an oil well produced fluid oil content metering device, including a vertical metering separation tank, the upper part, the lower part and the top of the metering separation tank are respectively provided with an oil well produced fluid input pipeline, a liquid discharge pipeline and an exhaust pipeline, the oil well produced fluid input pipeline, the liquid discharge pipeline and the exhaust pipeline are respectively provided with a liquid inlet valve, a liquid discharge valve and an exhaust valve, a plurality of mutually independent and mutually connected oil-water analysis measuring probes are arranged on different specified heights of the vertical direction of the metering separation tank from bottom to top, the oil-water analysis measuring array formed by the probes not only measures the oil-water proportion of each oil-water layer in the metering separation tank in real time, thereby obtaining the total water content of the oil well produced fluid required by oil field production, but also measures the liquid production volume and the gas production volume of the oil well in unit time by monitoring the real-time change of the liquid level in the metering separation tank, and the three-phase oil well measuring method for short. Because the above scheme needs to measure the composition of oil water in the tank, therefore, when accomplishing every measurement, need empty whole measurement knockout drum, can not be like current liquid measure gas technique in the measurement tank and remain bottom water or raffinate, but the three-phase fluid that is used for flowing back is along with the long-time oil vapor, and the raffinate that hangs in the measurement tank inner wall also constantly flows down in the flowing back process, leads to current measurement tank flowing back technique can't empty the measurement tank and drain, so, to patent 201280001771.1's flowing back, current scheme adopts the mode of draining pump flowing back to be in order to be in the liquid evacuation of measurement knockout drum after the feed liquor valve closes. However, the addition of the liquid discharge pump obviously increases the complexity of a mechanical structure and power distribution, increases the cost, reduces the safety and reliability of a measurement system, limits the development of an automatic measurement function, and cannot meet the requirement of an unattended function.
The invention comprises the following steps:
Aiming at the defects and shortcomings in the prior art, the invention provides an oil-water-gas multiphase flow array type measuring device with reasonable structure and low cost and application thereof.
The invention is achieved by the following measures:
An oil-water-gas multiphase flow array type measuring device is provided with a vertical metering separation tank body (1), an oil well produced liquid input port (101) is formed in the side face of the upper portion of the metering separation tank body (1), a liquid output port (102) is formed in the lower portion of the metering separation tank body (1), a gas output port (103) is formed in the top of the metering separation tank body (1), the oil well produced liquid input port is connected with an oil well produced liquid input pipeline (4), the liquid output port is connected with a liquid discharge pipeline (2), the gas output port is connected with an exhaust pipeline (3), a liquid discharge valve (201) is arranged on the liquid discharge pipeline, an exhaust valve (301) is arranged on the liquid discharge pipeline, an oil-water analysis measuring array (105) consisting of a plurality of probes is further arranged on the metering separation tank, and is characterized in that a three-way joint (45) is arranged on the oil well produced liquid input pipeline (4) below the oil well produced liquid input port (101), one output end of the three-way joint (45) is connected with the oil well produced liquid input port (101) through a liquid inlet pipeline (401), the other output end of the three-way joint (45) is connected with the oil well produced liquid input port (2) through a bypass pipeline (5), or is connected with the liquid discharge pipeline (2) through a bypass pipeline (5), the liquid discharge pipeline is connected with the liquid discharge pipeline (501), and the liquid discharge pipeline is connected with the liquid discharge pipeline (501) through the bypass pipeline (after the bypass pipeline (501) The exhaust pipeline (3) is respectively provided with a drain valve (201) and an exhaust valve (301), and the joint of the bypass pipeline (5) and the drain pipeline (2) is positioned behind the drain valve (201).
The probes near the bottom of the probes of the oil-water analysis and measurement array (105) are used as a liquid level switch for liquid discharge alarm.
The preset height difference is arranged between the oil well produced liquid input port (101) and the three-way joint (45) and is large enough, so that when the bypass pipeline is opened, the pressure fluctuation of the liquid inlet pipeline does not cause liquid to overflow into the separation tank input port, and the preset height difference can be 5cm-500cm.
In order to enable the emptying operation to be more accurate and timely, an auxiliary measuring tank (6) can be connected in series on the liquid discharge pipeline (2) behind the liquid discharge valve (2) and in front of the junction point of the liquid discharge valve and the bypass pipeline (5), the liquid outlet high point of the auxiliary measuring tank (6) is lower than the liquid inlet high point by a preset height, the preset height can be 2.5-50 cm, and a liquid level sensor (601) is further arranged on the auxiliary measuring tank (6) and used for indicating the change of the liquid level in the tank.
In order to reduce instant overflow caused by well pressure change during well changing operation, the liquid inlet pipeline (401) is connected in series with the pressure regulating buffer tank (402), the pressure regulating buffer tank (402) has a preset volume, and further, the preset volume can be 0.5-50 liters and is used for buffering instant overflow influence caused by well pressure difference.
In order to realize automatic measurement, each valve is required to be an electric or pneumatic valve, and an operation and control unit (7) is arranged, the operation and control unit (7) is electrically connected with each valve and each instrument, further, in order to realize continuous measurement of gas quantity and liquid quantity, a gas flowmeter or a liquid flowmeter is respectively connected in series with the exhaust pipeline (2) or the liquid discharge pipeline (3) for expanding the measurement function, and the gas flowmeter or the liquid flowmeter is electrically connected with the operation and control unit.
The invention also provides application of the oil-water-gas multiphase flow array type measuring device, which is characterized by comprising the following steps of:
in the initial state, a bypass valve (501) is in an open state, an exhaust valve (301) is in a closed state, a vertical metering separation tank body (1) is filled with gas, oil well produced liquid is conveyed outwards through a bypass pipeline (5), and the tank pressure and pipeline pressure of the vertical metering separation tank body (1) are balanced;
When measuring the water content data of the oil well production liquid, closing a bypass valve (501) and a liquid discharge valve (201), opening an exhaust valve (301), enabling the oil well production liquid to enter a vertical metering and separating tank body (1), discharging gas through an exhaust pipeline (3), enabling liquid to flow into the vertical metering and separating tank body (1), gradually increasing the liquid level in the vertical metering and separating tank body (1), monitoring the change of the liquid level in real time through an oil-water analysis array (105) or a liquid level switch, combining the change of the liquid level in the tank for a period with a corresponding tank capacity meter, and converting the oil well production liquid;
when the gas content of the oil well produced liquid is measured, a liquid discharge valve (201) is opened, a bypass valve (501) and an exhaust valve (301) are closed, after the oil well produced liquid enters a metering separation tank for gas-liquid separation, the liquid flows out of the metering separation tank body (1) along a liquid discharge pipeline (2), the liquid level in the tank is gradually reduced, the change of the liquid level and the time of the change are monitored in real time through an oil-water analysis array or a liquid level switch, and the liquid level change for a period of time is combined with a corresponding tank capacity meter, so that the oil well produced gas can be converted;
The tank body is emptied, preparation is made for the next measurement, the drain valve (201) is in an open state at the moment, the bypass valve (501) and the exhaust valve (301) are in a closed state, the oil-water-gas mixture is fully separated in the metering tank, liquid can be pushed to rapidly drain out through the drain pipeline (2), when the liquid level in the metering separation tank (1) reaches a liquid level set value, the bypass valve (501) is opened, the original state of the drain valve (201) and the exhaust valve (301) is kept unchanged, wherein the liquid level set value is in the lower tank position of the metering separation tank (1), the liquid level set value is larger than the lowest liquid level value in the metering separation tank (1), at the moment, most of oil well liquid is conveyed out through the bypass pipeline (5), part of gas separated out from the oil well liquid product input pipeline (4) and the bypass pipeline (5) continuously enters the metering separation tank (1) along the liquid inlet pipeline (401) under the double effects of three-phase flow self kinetic energy and gas-liquid density difference, the residual liquid and wall liquid are pushed to slowly drain out of the metering separation tank (1) by the liquid-free gas, and the liquid level set value is at the same time, the liquid level (2) and the liquid level (25) is slowly discharged through the liquid level set point (25) at the moment, the fast flow point and the liquid level in the liquid drain pipeline (25) is continuously flows down, when a liquid level switch at the lowest part of the metering separation tank (1) or a liquid level meter on a small buffer measuring tank of the liquid discharge pipeline (2) displays an alarm signal, residual liquid in the metering separation tank (1) is completely discharged, and the liquid discharge valve (201) is closed, so that the metering separation tank is in an emptying and draining state, a complete measuring process is completed, and preparation is made for next measurement.
The invention also comprises a method for continuously measuring the gas flow by using a flowmeter connected in series with the exhaust pipeline (2) or continuously measuring the liquid flow by using a liquid flowmeter connected in series with the exhaust pipeline (2) when continuous gas parameter measurement or liquid parameter measurement is carried out, wherein the gas and the liquid are stably separated in the metering separation tank (1) through coordination control of the exhaust valve or the exhaust valve, and simultaneously the gas flow or the liquid flow is continuously read, at the moment, the metering separation tank (1) plays the role of a gas-liquid separator, and the total liquid level in the metering separation tank is controlled to the initial liquid level of continuous measurement by adjusting the exhaust valve (201) or the exhaust valve (301) when continuous measurement is finished, so that unnecessary errors are eliminated.
The invention discloses a tank emptying method in an oil-water-gas multiphase flow array type measuring device, which comprises the steps of opening a bypass valve (501) when liquid in a measuring separation tank (1) reaches a set value, keeping the original state of a liquid discharge valve (201) and an exhaust valve (301) unchanged, conveying most of oil well liquid outwards through a bypass pipeline (5), and closing the liquid discharge valve (201) when the liquid level in the measuring separation tank (1) continuously enters the measuring separation tank (1) along a liquid inlet pipeline (401) under the dual action of the kinetic energy of three-phase flow and the gas-liquid density difference, and pushing the residual liquid and wall-mounted liquid to slowly discharge the measuring separation tank (1) by utilizing the gas without liquid.
Compared with the traditional pump drainage scheme, the invention realizes the emptying and drainage of the metering tank by utilizing the gas and control flow separated out by the three-phase flow on the premise of obviously reducing the structural complexity and the manufacturing cost of the device, ensures the accuracy and stability of measuring the oil-water proportion and the liquid and gas by using an array method, simultaneously, as a complex pump drainage system is omitted, not only is the fault point obviously reduced, but also at least one drain valve or exhaust valve can be ensured to be in an open state in other time except for the specific measurement, an external conveying passage is formed for the oil well liquid production, the safety of a measuring system is obviously improved, and the remote control and on-site unattended requirements are met.
Description of the drawings:
fig. 1 is a schematic view of a structure of the present invention.
Fig. 2 is a schematic structural view of a small auxiliary measuring tank and a pressure regulating buffer tank according to the present invention.
Fig. 3 is a schematic diagram of a small and medium-sized auxiliary measuring tank according to the invention.
FIG. 4 is a schematic diagram of a structure of a continuous measurement gas or liquid flowmeter with a pressure regulating buffer tank according to the present invention.
The device comprises a metering separation tank (1), an oil well liquid production input port (101), a liquid outlet (102), an exhaust port (103), a sampling port (104), an oil-water analyzer array (105), a temperature transmitter (106), a pressure transmitter (107), a liquid discharge pipeline (2), a liquid discharge valve (201), a liquid flowmeter (202), an exhaust pipeline (3), an exhaust valve (301), a gas flowmeter (302), a liquid production input pipeline (4), a liquid inlet pipe section (401), a pressure regulating buffer tank (402), a bypass pipeline (5), a bypass valve (501), an auxiliary measuring tank (6), a liquid level sensor (601), a central control and processing unit (7), a liquid discharge and bypass pipeline junction point (25), a three-way joint (45) and a gas-liquid pipeline junction point (23).
The specific embodiment is as follows:
the invention will be further described with reference to the drawings and examples.
Example 1:
as shown in fig. 1, this example provides an oil-water-vapor multiphase flow array type measuring device, which is provided with a vertical metering separation tank (1), an oil well liquid-producing input port (101) is formed on the side surface of the middle upper part of the metering separation tank (1), a liquid discharge port (102) is formed on the lower part of the metering separation tank (1), an exhaust port (103) is formed on the top of the metering separation tank (1), the oil well liquid-producing input port (101) is connected with an oil well liquid-producing input pipeline, the liquid discharge port (102) is connected with a liquid discharge pipeline (2), the exhaust port (103) is connected with an exhaust pipeline (3), a liquid discharge valve (201) is arranged on the liquid discharge pipeline (2), an exhaust valve (301) is arranged on the exhaust pipeline (3), an oil-water analyzer array (105) formed by a plurality of probes is further arranged on the metering separation tank (1), one output end of the three-way joint (45) is connected with the oil well liquid-producing input port (101), and the other output end of the three-way joint (45) is connected with the liquid discharge pipeline (2) and then connected with the liquid discharge confluence pipeline after the liquid discharge pipeline (2) is confluent;
the pipeline between the three-way joint (45) and the oil well liquid production inlet (101) is a liquid inlet pipeline section (401), the pipeline section connecting the three-way joint (45) and the liquid discharge pipeline (2) is a bypass pipeline (5), a bypass valve (501) is arranged on the bypass pipeline (5), the joint of the three-way joint (45) and the liquid discharge pipeline (2) is positioned in front of the liquid discharge valve (201), and a height difference is arranged between the oil well liquid production inlet (101) and the three-way joint (45) and is in the range of 5cm-500cm.
In the embodiment, one output end of a three-way joint (45) on an oil well produced liquid input pipeline is connected with an oil well produced liquid input port, the other output end of the three-way joint is connected with a liquid discharge pipeline (2) and then is connected with an exhaust liquid discharge converging pipeline, the exhaust liquid discharge converging pipeline is a pipeline formed by converging the liquid discharge pipeline and the exhaust pipeline, and when the oil well produced liquid input pipeline works, the timing of closing a liquid discharge valve (201) is judged by utilizing a signal given by an oil-water analysis unit positioned at the bottom of a metering separation tank;
After the measurement is finished, the oil-water-gas mixture is fully separated in the measuring tank and pushes liquid to be discharged outside through the liquid discharge pipeline (2), when the liquid in the measuring separation tank (1) reaches a set value, a bypass valve is opened, the original state of the liquid discharge valve and an exhaust valve is kept unchanged, most of oil well produced liquid is conveyed outside through the bypass pipeline (5), partial gas separated out from the produced liquid input pipeline (4) and the bypass pipeline (5) continuously enters the measuring separation tank (1) along the liquid inlet pipeline (401) under the dual action of the three-phase flow self kinetic energy and the gas-liquid density difference, the residual liquid and the wall-hanging liquid are pushed by utilizing the gas without the liquid to slowly discharge the measuring separation tank (1), the liquid level continuously descends, and when a liquid level sensor at the lowest part of the measuring separation tank (1) displays an alarm signal, the residual liquid in the measuring separation tank (1) is completely discharged, and the liquid discharge valve (201) is timely closed, so that the measuring separation tank (1) is in an emptying and discharging state is finished, and a complete measuring process is prepared for the next measurement.
Example 2:
In the embodiment, in order to enable the emptying operation to be more accurate and timely, an auxiliary measuring tank (6) is connected in series on a liquid discharge pipeline (2) behind a liquid discharge valve (201) and in front of a junction point of the liquid discharge pipeline (5) as shown in the figure 3, the high point of a liquid outlet of the auxiliary measuring tank (6) is 2.5-50 cm lower than the high point of a liquid inlet, and a liquid level sensor is further arranged on the auxiliary measuring tank (6) and used for indicating the change of the liquid level in the tank;
when the liquid level sensor is in operation, the timing of closing the liquid discharge valve (201) is judged by using signals given by the liquid level sensor on the small auxiliary measuring tank (6), and liquid discharge and control are more reliable and stable.
Example 3:
in the embodiment, in order to reduce instant overflow caused by well pressure change during well changing operation, a pressure-regulating buffer tank (402) (shown in fig. 4) is connected in series to the liquid inlet section (401), and the volume of the pressure-regulating buffer tank is 0.5-50 liters, so as to buffer instant overflow influence caused by well pressure difference;
In order to realize automatic measurement, each valve is an electric or pneumatic valve, and is provided with an operation and control unit, the operation and control unit is electrically connected with each valve and each instrument, and in order to realize continuous measurement of gas and liquid quantity, a gas flowmeter or a liquid flowmeter (shown in figure 4) is respectively connected in series on the exhaust pipeline or the liquid discharge pipeline for expanding the measurement function, and the gas flowmeter or the liquid flowmeter is electrically connected with the operation and control unit.
The application method of the oil-water-gas multiphase flow array type measuring device in the embodiment is as follows:
in the initial state, a bypass valve (501) is in an open state, an exhaust valve (301) is in a closed state, the vertical metering separation tank body (1) is filled with gas, oil well produced liquid is externally conveyed through a bypass pipeline (5), and the tank pressure of the vertical metering separation tank body (1) is balanced with pipeline pressure;
when the water content data of the oil well produced liquid is measured, a bypass valve (501) is closed, an exhaust valve (301) is opened, the oil well produced liquid enters a vertical metering and separating tank body (1), after gas and liquid in the oil well produced liquid are separated, gas is discharged through an exhaust pipeline (3), the liquid flows into the vertical metering and separating tank body (1), at the moment, the liquid level in the vertical metering and separating tank body (1) is gradually increased, the change of the liquid level and the time thereof are monitored in real time through an oil-water analysis array (105) or a liquid level switch, the liquid level change in the tank for a period of time is combined with a corresponding tank capacity meter, the oil well produced liquid can be converted, before the tank is full, the exhaust valve (301) is closed, the bypass valve (501) is opened, the measured oil well produced liquid is discharged through the bypass pipeline (5), the central control and processing unit (7) controls each oil-water measuring sensor on the oil-water analyzer array (105) to measure the oil-water composition of a liquid thin layer corresponding to the current oil-water measuring sensor, and the water content of the oil-water mixture is calculated in an accumulated manner;
when the gas content of the oil well produced liquid is measured, a liquid discharge valve (201) is opened, a bypass valve (501) and an exhaust valve (301) are closed, after the oil well produced liquid enters a metering separation tank for gas-liquid separation, the liquid flows out of the metering separation tank body (1) along a liquid discharge pipeline (2), the liquid level in the tank is gradually reduced, the change of the liquid level and the time of the change are monitored in real time through an oil-water analysis array or a liquid level switch, and the liquid level change for a period of time is combined with a corresponding tank capacity meter, so that the oil well produced gas can be converted;
When continuous gas parameter measurement or liquid parameter measurement is performed, the gas flow is continuously measured by using a flowmeter connected in series with the exhaust pipeline (2), or the liquid flow is continuously measured by using a liquid flowmeter connected in series with the liquid discharge pipeline (2): the gas and the liquid are stably separated in the metering separation tank (1) through coordinated control of the exhaust valve or the exhaust valve, and simultaneously the gas flow or the liquid flow is continuously read, at the moment, the metering separation tank (1) plays a role of a gas-liquid separator, and the total liquid level in the metering separation tank is controlled to the initial liquid level of continuous measurement through adjusting the exhaust valve (201) or the exhaust valve (301) when continuous measurement is finished so as to eliminate unnecessary errors;
The tank body is emptied after the measurement is finished, preparation is made for the next measurement, the oil-water-gas mixture is fully separated in the metering tank, and liquid can be pushed to be discharged outside through the liquid discharge pipeline (2), specifically, when the liquid in the metering separation tank (1) reaches a set value, a bypass valve (501) is opened, the original states of the liquid discharge valve (201) and the exhaust valve (301) are kept unchanged, at the moment, most oil well liquid is delivered out through the bypass pipeline (5), partial gas separated out from the oil well liquid input pipeline (4) and the bypass pipeline (5) continuously enters the metering separation tank (1) along the liquid inlet pipeline (401) under the double effects of the kinetic energy of three-phase flow and the gas-liquid density difference, the residual liquid and the wall-hanging liquid are pushed to be slowly discharged out of the metering separation tank (1) by utilizing the gas without liquid, at the moment, the liquid level in the tank continuously descends, when a liquid level switch at the lowest part of the metering separation tank (1) or a liquid level meter on a small buffer measuring tank arranged on the liquid discharge pipeline (2) displays an alarm signal, the residual liquid in the metering separation tank (1) is discharged, and the whole metering separation tank (201) is guaranteed to be in a complete measurement state, and the next measurement is prepared.
Compared with the traditional pump drainage scheme, the invention has the advantages that the valve is not required to be arranged at the input port of the metering separation tank, on one hand, the associated gas separated from spontaneous combustion in the pipeline can be fully utilized to realize the emptying and drainage of the metering tank, on the other hand, except for the short time of specific measurement, at least one of the liquid discharge valve or the exhaust valve can be ensured to be in an open state, an output passage is formed for the liquid production of an oil well, the safety of a measuring system is obviously improved, the requirements of remote control and on-site unattended operation are met, and particularly, compared with the original pump drainage technology, the invention has the advantages that (1) the equipment structure is optimized and simplified, the equipment cost is obviously reduced, meanwhile, the fault point and maintenance workload are reduced, the measurement and control safety and reliability are improved, and the requirements of remote control and unattended operation can be realized. (2) The technical scheme adopts an inlet normally open structure, reduces the impact of the water hammer effect of the measurement inverted well on equipment and pipelines, and further improves the safety of the equipment and the pipelines. (3) The characteristics of the three-phase fluid are fully utilized to perform liquid discharge, and the control and emptying effects are stable and reliable. (4) The continuous measuring function of gas and liquid is added, and the further requirements of the oil field can be met.
Claims (12)
1. The application of the oil-water-gas multiphase flow array type measuring device is characterized in that an oil well produced liquid input port (101) is arranged on the side surface of the upper part of the vertical type measuring and separating tank (1), a liquid output port (102) is arranged on the lower part of the vertical type measuring and separating tank (1), a gas output port (103) is arranged on the top of the vertical type measuring and separating tank (1), the oil well produced liquid input port is connected with an oil well produced liquid input pipeline (4), the liquid output port is connected with a liquid discharge pipeline (2), the gas output port is connected with an exhaust pipeline (3), a liquid discharge valve (201) is arranged on the liquid discharge pipeline, an exhaust valve (301) is arranged on the exhaust pipeline, an oil-water analysis measuring array (105) consisting of a plurality of probes is further arranged on the vertical type measuring and separating tank (1), the oil well produced liquid input pipeline (4) below the oil well produced liquid input port (101) is provided with a three-way joint (45), one output end of the three-way joint (45) is connected with the oil well produced liquid (101) through a liquid inlet pipeline (401), the other output end of the three-way joint (45) is connected with the liquid output pipeline (2) through a bypass pipeline (5), or is connected with the liquid output pipeline (501) through the bypass pipeline (5), the liquid discharge pipeline (2) and the exhaust pipeline (3) are respectively provided with a liquid discharge valve (201) and an exhaust valve (301), and the joint of the bypass pipeline (5) and the liquid discharge pipeline (2) is positioned behind the liquid discharge valve (201);
The system is also provided with a central control and processing unit (7), and the central control and processing unit (7) is electrically connected with each valve and each instrument;
The method is characterized in that the application of the oil-water-gas multiphase flow array type measuring device comprises the following steps:
In the initial state, a bypass valve (501) is in an open state, an exhaust valve (301) is in a closed state, a vertical metering separation tank (1) is filled with gas, oil well produced liquid is externally conveyed through a bypass pipeline (5), and the pressure in the tank of the vertical metering separation tank (1) is balanced with pipeline pressure;
When measuring the water content data of the oil well production liquid, closing a bypass valve (501) and a liquid discharge valve (201), opening an exhaust valve (301), allowing the oil well production liquid to enter a vertical metering separation tank (1), discharging gas through an exhaust pipeline (3), allowing the liquid to flow into the vertical metering separation tank (1), gradually increasing the liquid level in the vertical metering separation tank (1), monitoring the change of the liquid level in real time through an oil-water analyzer array (105) or a liquid level switch, combining the liquid level change in the tank for a period with a corresponding tank capacity meter, and converting the oil well production liquid amount;
When the gas content of the oil well produced liquid is measured, a liquid discharge valve (201) is opened, a bypass valve (501) and an exhaust valve (301) are closed, after the oil well produced liquid enters a metering separation tank for gas-liquid separation, the liquid flows out of a vertical metering separation tank (1) along a liquid discharge pipeline (2), the liquid level in the tank is gradually reduced, the change of the liquid level and the time of the change are monitored in real time through an oil-water analysis array or a liquid level switch, and the liquid level change for a period of time is combined with a corresponding tank capacity meter, so that the oil well produced gas can be converted;
Step 3: the tank is emptied and ready for the next measurement: at the moment, the liquid discharge valve (201) is in an open state, the bypass valve (501) and the exhaust valve (301) are in a closed state, the oil-water-gas mixture is fully separated in the metering tank and pushes liquid to be discharged out through the liquid discharge pipeline (2), when the liquid level in the vertical metering separation tank (1) reaches a liquid level set value, the bypass valve (501) is opened, the original states of the liquid discharge valve (201) and the exhaust valve (301) are kept unchanged, wherein the liquid level set value is in the lower position of the tank body of the vertical metering separation tank (1) and is larger than the lowest liquid level value in the vertical metering separation tank (1), at the moment, most of oil well liquid is delivered out through the bypass pipeline (5), part of gas separated out from a liquid production input pipeline (4) and a bypass pipeline (5) of an oil well continuously enters the vertical metering separation tank (1) along a liquid inlet pipeline (401) under the dual action of the kinetic energy of the three-phase flow and the gas-liquid density difference, residual liquid and wall-mounted liquid are pushed by the gas without liquid to be slowly discharged out of the vertical metering separation tank (1), meanwhile, the liquid discharge is enhanced by means of Bernoulli effect of fast flowing liquid and slow flowing liquid, the liquid level in the tank continuously descends at the moment, and when a liquid level switch positioned at the lowest part of the vertical metering separation tank (1) or a liquid level meter positioned on a small buffer measuring tank of a liquid discharge pipeline (2) displays an alarm signal, residual liquid in the vertical metering separation tank (1) is completely discharged, the drain valve (201) is closed, thereby ensuring that the metering separator tank is in an empty and drain state, completing a complete measurement process and preparing for the next measurement.
2. The application of the oil-water gas multiphase flow array type measuring device according to claim 1, wherein the step 2 further comprises a method for continuously measuring the gas flow by using a flowmeter connected in series with the exhaust pipeline (3) or continuously measuring the liquid flow by using a liquid flowmeter connected in series with the liquid discharge pipeline (2) when continuous gas parameter measurement or liquid parameter measurement is carried out, wherein the gas and the liquid are stably separated in the vertical metering separation tank (1) through coordinated control of the exhaust valve or the liquid discharge valve, and simultaneously the gas flow or the liquid flow is continuously read, the vertical metering separation tank (1) plays a role of a gas-liquid separator, and the total liquid level in the metering separation tank is controlled to the initial liquid level of continuous measurement by adjusting the liquid discharge valve (201) or the exhaust valve (301) when continuous measurement is finished, so that unnecessary errors are eliminated.
3. The application of the oil-water-gas multiphase flow array type measuring device according to claim 1, wherein the tank body emptying comprises opening a bypass valve (501) and keeping a drain valve (201) and an exhaust valve (301) in an open state when the liquid level in the vertical metering separation tank (1) reaches a certain position in the lower part of the tank, wherein most of oil well liquid is delivered through a bypass pipeline (5), part of gas separated out from an oil well liquid input pipeline (4) and the bypass pipeline (5) continuously enters the vertical metering separation tank (1) along a liquid inlet pipeline (401) under the dual actions of the kinetic energy of three-phase flow and the gas-liquid density difference, residual liquid and wall-mounted liquid are pushed to slowly drain the vertical metering separation tank (1) by utilizing the gas without liquid, meanwhile, the liquid level in the tank is continuously lowered by means of Bernoulli effect of the fast flowing liquid and the slow flowing liquid, and a liquid level switch positioned at the lowest part of the vertical metering separation tank (1) or a liquid level meter positioned on a small buffer measuring tank displays an alarm signal, the vertical metering separation tank (1) is completely lowered, and the residual liquid is completely drained after the vertical metering separation tank (201) is completely drained, and the measurement is completely finished.
4. The use of an oil-water-gas multiphase flow array measuring device according to claim 1, characterized in that a probe of the plurality of probes of the oil-water analyzer array (105) in the oil-water-gas multiphase flow array measuring device, which is close to the bottom, is used as a liquid level switch for liquid discharge alarm.
5. The use of an oil-water-gas multiphase flow array measuring device according to claim 1, characterized in that the oil well produced fluid input port (101) and the three-way joint (45) in the oil-water-gas multiphase flow array measuring device have a predetermined height difference.
6. The application of the oil-water-gas multiphase flow array type measuring device according to claim 1, wherein an auxiliary measuring tank (6) is connected in series on a drain pipeline (2) behind a drain valve (201) and before a junction point with a bypass pipeline (5), the liquid outlet high point of the auxiliary measuring tank (6) is lower than the liquid inlet high point by a preset height, and a liquid level sensor (601) is further arranged on the auxiliary measuring tank (6) and used for indicating the change of the liquid level in the tank.
7. The application of the oil-water-gas multiphase flow array type measuring device according to claim 1, wherein a pressure regulating buffer tank (402) is connected in series on the liquid inlet pipeline (401) in the oil-water-gas multiphase flow array type measuring device, and the pressure regulating buffer tank (402) has a preset volume so as to buffer the instant overflow influence caused by well rotation pressure difference.
8. The application of the oil-water-gas multiphase flow array type measuring device according to claim 1, wherein the oil-water-gas multiphase flow array type measuring device is characterized in that a gas flowmeter or a liquid flowmeter is respectively connected in series on the exhaust pipeline (3) or the liquid discharge pipeline (2) for expanding the measuring function, and the gas flowmeter or the liquid flowmeter is electrically connected with the operation and control unit.
9. The use of an oil-water-gas multiphase flow array measuring device according to claim 5, characterized in that the height difference is set large enough that when the bypass pipe is opened, the pressure fluctuation of the liquid inlet pipe does not cause liquid to overflow into the inlet (101) of the separation tank.
10. The use of an oil-water-gas multiphase flow array measuring device according to claim 9, wherein the height difference is in the range of 5cm-500cm.
11. The application of the oil-water-gas multiphase flow array type measuring device according to claim 6, wherein the predetermined height is 2.5-50 cm.
12. The application of the oil-water-gas multiphase flow array type measuring device according to claim 7, wherein the preset volume is 0.5-50 liters.
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| CN118243733B (en) * | 2024-03-22 | 2024-10-15 | 常熟理工学院 | A method and device for measuring flow parameters of oil-water two-phase flow on an unmanned offshore oil production platform |
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