CN107905779B - Online metering device and method for three-phase flow of split-phase flow control type oil well - Google Patents
Online metering device and method for three-phase flow of split-phase flow control type oil well Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 239000003129 oil well Substances 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 100
- 238000005259 measurement Methods 0.000 claims abstract description 32
- 239000007788 liquid Substances 0.000 claims abstract description 31
- 239000012530 fluid Substances 0.000 claims abstract description 23
- 239000003921 oil Substances 0.000 claims description 59
- 239000003153 chemical reaction reagent Substances 0.000 claims description 15
- 230000005484 gravity Effects 0.000 claims description 11
- 238000000926 separation method Methods 0.000 claims description 10
- 239000010779 crude oil Substances 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 230000018044 dehydration Effects 0.000 claims description 6
- 238000006297 dehydration reaction Methods 0.000 claims description 6
- 230000004069 differentiation Effects 0.000 claims description 5
- 238000006073 displacement reaction Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 230000008021 deposition Effects 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 238000005191 phase separation Methods 0.000 description 2
- 230000002285 radioactive effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
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- E21B47/00—Survey of boreholes or wells
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Abstract
The invention relates to a split-phase flow type oil well three-phase flow online metering device and method. The problem that the existing metering method is low in measurement precision is mainly solved. The method is characterized in that: an upper air outlet and a safety port on the top of the metering tank are communicated with a lower liquid outlet at the bottom through an external pipeline and a flow channel; the lower end of the external pipeline is communicated with a flow passage through a tee joint and a bypass valve, the flow passage is connected with a lower liquid outlet, and the flow passage is connected with a liquid inlet sieve tube through the tee joint; the metering method comprises three flows of gas phase, water phase and oil phase measurement stages, an unmeasured split phase is derived by using the difference of oil-gas-water density at different time periods by using a flow channel conversion technology, a phase to be measured is left, an oil-gas interface sensor and an oil-water interface sensor are used for carrying out fine measurement, and the temperature and the pressure of fluid are measured simultaneously to obtain the oil-gas-water phase flow. The split-phase flow control type oil well three-phase flow online metering device and method are high in metering precision and suitable for automatic split-phase online metering of oil, gas and water in a single well, a metering station and the like.
Description
Technical Field
The invention relates to the technical field of oil field oil extraction engineering, in particular to a split-phase flow type oil well three-phase flow online metering device and method.
Background
The measurement of the oil well yield, especially the split-phase measurement of oil-gas-water three-phase, is an important work in the production management of the oil field, accurately and timely measures the oil well yield, and has very important guiding significance for formulating a production scheme for the production condition of the oil field. At present, oil well yield measuring methods adopted in various oil fields in China mainly comprise glass pipe oil measurement, skip bucket oil measurement, software oil measurement, two-phase separation density method, three-phase separation measuring method and the like, and the methods generally have the problem of low measuring precision.
Disclosure of Invention
The invention aims to solve the problem of low measurement precision of the conventional metering method in the background art, and provides the split-phase flow type oil well three-phase flow online metering device. The split-phase flow type oil well three-phase flow online metering device is high in metering precision, is suitable for automatic split-phase online metering of oil, gas and water in a single well, a metering station and the like, and the split-phase measuring precision is better than +/-3%. The invention also provides a metering method of the online metering device for the three-phase flow of the split-phase flow control oil well.
The invention can solve the problems by the following technical scheme: the split-phase flow type oil well three-phase flow online metering device comprises a metering tank, wherein the metering tank is a tank body with a necking in the middle; the top and the bottom of the metering tank are respectively provided with an upper air outlet, a safety port and a lower liquid outlet, and the upper air outlet, the safety port and the lower liquid outlet are communicated through an external pipeline and a flow passage; the upper pipeline of the upper air outlet is connected with a proportional valve A, and the outer pipeline part on the right side of the proportional valve A is connected with a safety port on the top of the tank through a tee joint and a safety valve; the lower end of the external pipeline is communicated with a flow passage through a tee joint, the flow passage is respectively connected with a lower liquid outlet through the tee joint and a proportional valve B, and is connected with a liquid inlet sieve pipe through the tee joint and a valve D; the two ends of the flow passage are respectively connected with an inlet flange and an outlet flange.
The invention also provides a metering method for the split-phase flow control type oil well three-phase flow online metering device, which comprises the following steps:
1) the first step is as follows: gas phase measurement process:
opening a valve D and a proportional valve A, closing a proportional valve B and a valve C, enabling oil-gas-water three-phase fluid to enter from an inlet flange and enter into a metering tank through the valve D and a liquid inlet sieve tube, enabling the layered arrangement of gas, oil and water to appear in the metering tank from top to bottom, opening the valve D and a lower liquid outlet proportional valve B when an oil-gas interface rises to a specific position on the upper portion of the metering tank, closing an upper outlet proportional valve A and a bypass valve C, starting timing, enabling gas phase to slowly accumulate on the upper portion of the metering tank, and forcing oil and water to flow out from a lower liquid outlet, stopping timing when the oil-gas interface reaches the specific position on the bottom of the metering tank, enabling an oil-gas interface sensor to measure displacement of the oil-gas interface at the time, adding a pressure sensor, a temperature sensor and a sectional area corresponding to the metering tank;
2) the second step is that: water measuring process
Opening a valve D and a proportional valve B, closing the valve C and the proportional valve A, slowly accumulating gas phase, when an oil-gas interface sensor detects that an oil-gas interface reaches the bottommost end of a metering tank, enabling the metering tank to be in a fully inflated state, opening the valve D and the proportional valve A, closing the proportional valve B and the valve C, starting timing, enabling oil-gas-water three-phase fluid to enter the metering tank from an inlet flange, enabling the oil-gas-water three-phase fluid to enter the metering tank through the valve D and a sieve tube, enabling the metering tank to be layered and arranged from top to bottom and moving upwards slowly, opening a bypass valve C when the oil-water interface rises to a specific position away from the top end of the metering tank, closing the upper outlet proportional valve A, a liquid inlet control valve D and a lower liquid outlet; at the moment, the metering tank intercepts three-phase fluid for a period of time, and after proper gravity differentiation, when the moving speed of an oil-water interface meets the requirement, the oil-water interface sensor measures the height of a water phase; the flow rate of the water phase can be obtained by combining the measuring time and the sectional area of each part of the measuring tank;
3) the third step: oil phase measurement process
Opening a valve D and a proportional valve B, closing a valve C and a proportional valve A, slowly accumulating gas phase, when an oil-gas interface sensor detects that an oil-gas interface reaches the bottommost end of a metering tank, the metering tank is in a fully inflated state, opening the valve D and the proportional valve A, closing the proportional valve B and the valve C, starting timing, allowing an oil-gas-water three-phase fluid to enter from an inlet flange and enter into a metering barrel through the valve D and a sieve tube, due to the difference of gravity, layering arrangement of gas, oil and water from top to bottom can occur, and the oil-gas interface sensor slowly moves upwards, when the oil-gas interface completely rises to a specific position at the upper part of the metering tank, measuring the height of the oil-gas interface by the oil-gas interface sensor, measuring the height of the oil-water interface by the oil-water interface sensor, and adjusting the proper opening degrees of the proportional valve A and the proportional valve B, the oil phase is clamped at the middle necking part of the metering tank by steam and water, if the gas-oil interface has the sign of moving upwards, the proportional valve A is reduced in certain opening degree, the proportional valve B is increased in certain opening degree, if the gas-oil interface has the sign of moving downwards, the proportional valve B is reduced in certain opening degree, the proportional valve A is increased in certain opening degree, and the gas-oil interface is always maintained near the specific height of the upper part of the metering tank through a feedback technology. Stopping timing until the height difference between the oil-gas interface and the oil-water interface is greater than or equal to a specific value, opening the valve C, and closing the proportional valve A, the proportional valve B and the valve D; at the moment, the oil phase of a period of time is intercepted by the metering tank, the oil-water separation is accelerated by spraying a proper amount of chemical reagent from the chemical reagent injection port, the oil-water separation is accelerated by supplying power to the crude oil electric dehydration instrument, and the gravity difference of a proper time exists, so that water is separated from the oil phase, the oil-water interface moves upwards, and when the moving distance of the oil-water interface at a specified time meets the requirement, the oil-gas interface sensor and the oil-water interface sensor measure the height of the oil phase. And the flow rate of the oil phase can be obtained by combining the measuring time and the sectional area of each part of the metering tank.
Compared with the background technology, the invention has the following beneficial effects: by adopting the split-phase flow control type oil well three-phase flow online metering device and method, the flow channel conversion technology is utilized, the difference of oil-gas-water density is utilized at different time periods, the unmeasured split phase is derived, the phase to be measured is left, the factor of mutual interference among the phases is discharged, and the measurement precision is improved; when measuring the oil phase, a flow control mode is adopted, the oil phase is accumulated for a long time, and when the oil phase reaches a certain magnitude, the measurement is carried out, so that random errors are eliminated, the measurement precision is improved, and the method is particularly suitable for the measurement of a high water-cut well; the full-closed online measurement is adopted, so that the safety and the environmental protection are realized; according to different components of the produced fluid, a proper oil-water separation reagent can be selectively added, so that the measurement precision is improved; the measuring tank is additionally provided with a heating element, so that wax deposition on the inner wall of the measuring tank is avoided, and the measuring precision is not influenced. And the multi-sensor comprehensive measurement is adopted, so that the measurement reliability is improved. And a non-radioactive measurement method is adopted, so that the safety and the environmental protection are realized.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a structure for carrying out the metering of the present invention.
In the figure: 1. a chemical agent injection port; 2. a temperature sensor; 3. an oil-gas interface sensor; 4. an upper air outlet; 5. an oil-water interface sensor; 6. a proportional valve A; 7. a pressure sensor; 8. a safety valve; 9. a safety vent; 10. a metering tank; 11. a warming element; 12. a lower liquid outlet; 13. an outlet flange; 14. a proportional valve B; 15. a valve C; 16. an inlet flange; 17. a valve D; 18. a liquid inlet sieve tube; 19. crude oil electric dehydration instrument; 20. a water zone; 21 oil-water interface; 22. an oil zone; 23. an external pipe; 24. an oil-gas interface; 25. a gas zone; 26. and a flow passage.
The specific implementation mode is as follows:
the invention will be further described with reference to the following drawings and specific embodiments:
as shown in fig. 1 and fig. 2, the split-phase flow-control online metering device for three-phase flow of an oil well comprises a metering tank 10, wherein the metering tank 10 is a non-uniform metering tank, an upper gas outlet 4, a safety port 9 and a lower liquid outlet 12 are respectively formed in the top and the bottom of the metering tank 10, and the upper gas outlet 4, the safety port 9 and the lower liquid outlet 12 are communicated through an external pipeline 23 and a flow passage 26; the outer pipeline 23 at the upper part of the upper air outlet 4 is connected with a proportional valve A6, and the outer pipeline 23 at the right side of the proportional valve A6 is connected with a safety port 9 at the top of the tank through a tee joint and a safety valve 8; the lower end head of the external pipeline 23 is communicated with the flow passage 26 through a tee joint, and the flow passage 26 is respectively connected with the lower liquid outlet 12 and the liquid inlet sieve tube 18 through the tee joint, a proportional valve B14 and a valve D17; a valve C15 is connected on the flow passage 26 between the valve B14 and the valve D17; the upper cover of the metering tank 10 is downwards provided with a chemical reagent injection port 1, a temperature sensor 2, an oil-gas interface sensor 3, an oil-water interface sensor 5 and a pressure sensor 7; a heating element 11 is wound on the outer wall of the metering tank 10; the two ends of the flow passage 26 are respectively connected with an inlet flange 16 and an outlet flange 13; the bottom of the metering tank 10 is provided with a crude oil electric dehydration instrument 19; the metering tank 10 is an I-shaped unequal-diameter metering tank, and the heights h2 and h4 from the bottom of the tank are respectively the height of a middle necking end; the inside of the metering tank 10 is divided into a water area 20, an oil-water interface 21, an oil area 22, an oil-gas interface 24 and a gas area 25 from top to bottom; the side surface of the metering tank 10 is provided with a data acquisition control transmission unit, and the data acquisition control transmission unit can adopt a data acquisition control transmission unit which is manufactured by Daqing Baohe petroleum technology limited and has a model of DQBH-CK 1; the data acquisition control transmission unit is respectively connected with a chemical reagent injection port 1, a temperature sensor 2, an oil-gas interface sensor 3, an oil-water interface sensor 5, a proportional valve A6, a pressure sensor 7, a crude oil electric dehydration instrument 19, a proportional valve B14, a valve C15 and a valve D17 through cables; the proportional valve B14 and the proportional valve A6 are linear proportional valves, and can achieve the purpose of controlling the flow rate of passing fluid by controlling the opening degree of the proportional valves, and can also be completely opened or completely closed.
The method for metering by using the split-phase flow control type oil well three-phase flow online metering device is divided into three flows, namely a gas phase measuring stage, an oil-water measuring stage and an oil phase measuring stage, and specifically comprises the following steps:
1) the first step is as follows: gas phase measurement process
Opening a valve D17 and a proportional valve A6, closing a proportional valve B14 and a valve C15, enabling oil-gas-water three-phase fluid to enter from an inlet flange 16, and then enter a metering tank through a valve D17 and a liquid inlet sieve tube 18, wherein due to the difference of gravity, the metering tank is layered from top to bottom and moves upwards slowly, and the fluid flows out of the proportional valve A6 and reaches an outlet flange 13 through a pipeline; when the oil-gas interface 24 rises to the upper H5 position of the metering tank 10, the oil-gas interface sensor 3 measures the oil-gas interface height H5, the valve D17 and the proportional valve B14 are opened, the proportional valve A6 and the valve C15 are closed, timing is started to be time t1, gas phase can slowly accumulate at the upper part of the metering tank 10 and press the oil zone 22 and the water zone 20 to flow out of the lower liquid outlet 12, when the oil-gas interface 24 reaches the bottom H1 position of the metering tank 10, the oil-gas interface sensor 3 measures the oil-gas interface height H1, the valve C15 is opened, the valve D17, the proportional valve A6 and the proportional valve B14 are closed, timing is t 24, timing is ended, the timing is stopped 1 for a certain time, when the change of the oil-gas interface height H1 measured by the oil-gas interface sensor 3 is within a certain range, separation is ended, the measured gas phase time t is t2-t1, and the accumulated gas volume V is S82 1 (H56-4 + H2-1-H) (36 2-8672), wherein S1 is the effective sectional area of the inner part of the upper end and the lower end of the metering tank 10, and S2 is the effective sectional area of the narrowed part of the thinner part of the metering tank 10; at this time, the pressure measured by the pressure sensor 7 is P, the temperature measured by the temperature sensor 2 is T, the gas is V1 in the standard state according to the PVT equation, and the gas production flow is converted into the following gas production flow: v1/t;
2) the second step is that: water measuring process
Opening valve D17 and proportional valve B14, closing valve C15 and proportional valve A6, slowly accumulating gas phase, when the oil-gas interface sensor detects that the oil-gas interface reaches the bottommost end of the metering tank, the metering tank is in a fully inflated state, opening valve D17 and proportional valve A6, closing proportional valve B14 and valve C15, allowing oil-gas-water three-phase fluid to enter from inlet flange 16, pass through valve D17 and screen 18, enter into the metering tank, due to gravity difference, layering of gas zone 25, oil-gas interface 24, oil zone 22, oil-water interface 21 and water zone 20 occurs from top to bottom in the metering tank, and slowly moving upwards, allowing fluid to flow out from proportional valve A6 and flow out from outlet flange 13 through a pipeline, when the oil-water interface 21 rises to the H1 position of the metering tank 10, measuring oil-water interface height H1 by oil-water interface sensor 5, starting timing, and keeping the time at t1, and slowly accumulating water phase at the bottom of the metering tank 10, pressing oil 22 and gas 25 to flow out from an upper air outlet 4, when an oil-water interface 21 reaches the H5 position at the upper part of the metering tank 10, measuring the height H5 of the oil-water interface by an oil-water interface sensor 5, opening a bypass valve C15, closing a proportional valve A6, a valve D17 and a proportional valve B14, wherein the time is t2, finishing timing, and measuring the water phase time t-t 2-t 1; at the moment, the metering tank intercepts a period of three-phase fluid, and the three-phase fluid is subjected to proper gravity differentiation, meanwhile, the heating element 11 and the crude oil electric dehydrator 19 supply power, so that the separation time is shortened, when a chemical reagent needs to be added, a proper amount of reagent is added into the oil chemical reagent filling port 1, the separation of oil, gas and water three phases is accelerated, and when the moving speed of an oil-water interface 21 meets the requirement, the oil-water interface sensor 5 measures the height H5 of a water phase; the accumulated water volume V is S1 (H5-H4+ H2-H1) + S2 (H4-H2) is combined with the measurement time and the cross-sectional area of each part of the metering tank, and the flow rate of the water phase is obtained as follows: v/t;
3) the third step: oil phase measurement process
Opening a valve D17 and a proportional valve B14, closing a valve C15 and a proportional valve A6, slowly accumulating gas phase, when an oil-gas interface sensor detects that the oil-gas interface reaches the bottommost end of the metering tank, the metering tank is in a fully inflated state, opening the valve D17 and the proportional valve A6, closing a proportional valve B14 and a valve C15, starting timing, and starting timing at time t1, wherein three-phase fluid of oil, gas and water enters the metering tank from an inlet flange 16 and passes through a valve D17 and a sieve tube 18, the metering tank can be layered from top to bottom due to gravity difference, the gas zone 25, the oil-gas interface 24, the oil zone 22, the oil-water interface 21 and the water zone 20 can be gradually moved upwards, the fluid flows out from the proportional valve A6 and reaches an outlet flange 13 through a pipeline, when the oil-gas interface 24 rises to a specific position h4 on the upper part of the metering tank, controlling the proportional valve A6 to be opened by a certain opening degree, the proportional valve B14, the water phase flows out from the lower liquid outlet 12, the oil phase is clamped in a part of an oil area 22 which is constricted in the middle of the metering tank by steam and water, if the gas-oil interface 24 shows the sign of moving upwards, the proportional valve A6 is reduced for a certain opening degree, the proportional valve B14 is increased for a certain opening degree, if the gas-oil interface 24 shows the sign of moving downwards, the proportional valve B14 is reduced for a certain opening degree, the proportional valve A6 is increased for a certain opening degree, and the gas-oil interface 24 is always kept near a specific position h4 at the upper part of the metering tank 10 through feedback; stopping timing until the height difference between the oil-gas interface 24 and the oil-water interface 21 is greater than or equal to a specific value, and measuring the oil phase time t which is t2-t1 at time t 2; at the moment, the metering tank intercepts a period of three-phase fluid, and simultaneously supplies power to the heating element 11 and the crude oil electric dehydrator 19 to accelerate the separation time, when a chemical reagent needs to be added, a proper amount of reagent is added through the chemical reagent injection port 1 to accelerate the separation of oil, gas and water three phases, after gravity differentiation at a proper time, water in an oil phase is separated out, the oil-water interface 21 moves upwards, and when the moving speed of the oil-water interface 21 meets the requirement, the oil-water interface sensor 5 measures the height H of the oil-water interface; the oil-gas interface sensor 3 measures the oil-gas interface height H0, the accumulated oil volume V ═ s2 × (H-H0), and the flow rate of the oil phase can be obtained as follows: v/t.
According to the split-phase flow control type oil well three-phase flow online metering device and method, a flow channel conversion technology is utilized, at different time periods, the difference of oil-gas-water density is utilized, unmeasured split phases are derived, a phase to be measured is left, the factor of mutual interference among the phases is eliminated, and the measurement precision is improved; the oil phase is measured in a multi-time flow control mode and accumulated for a long time, so that the oil phase is measured when reaching a certain magnitude, random errors are eliminated, the measurement precision is improved, and the method is particularly suitable for the measurement of a high water-cut well; the full-closed online measurement is adopted, so that the safety and the environmental protection are realized; according to different components of the produced fluid, a proper oil-water separation reagent can be selectively added, so that the measurement precision is improved; the measuring tank is additionally provided with a heating element, so that wax deposition on the inner wall of the measuring tank is avoided, and the measuring precision is not influenced. And the multi-sensor comprehensive measurement is adopted, so that the measurement reliability is improved. And a non-radioactive measurement method is adopted, so that the safety and the environmental protection are realized.
Claims (6)
1. A metering method is realized by a split phase flow type oil well three-phase flow online metering device;
the split-phase flow control type oil well three-phase flow online metering device comprises a metering tank (10), wherein the metering tank (10) is a tank body with a necking in the middle; the top of the metering tank (10) is provided with an upper air outlet (4), a safety port (9), the bottom of the metering tank (10) is provided with a lower liquid outlet (12), and the upper air outlet (4), the safety port (9) and the lower liquid outlet (12) are communicated through an external pipeline (23) and a flow channel (26); a proportional valve A (6) is connected to the upper pipe section of an external pipeline (23) connected with the upper air outlet (4), and the part of the external pipeline (23) on the right side of the proportional valve A (6) is connected with a safety port (9) at the top of the tank through a tee joint and a safety valve (8); the lower end of the external pipeline (23) is communicated with a flow passage (26) through a tee joint, the flow passage (26) is connected with the lower liquid outlet (12) through the tee joint and a proportional valve B (14), and the flow passage (26) is connected with a liquid inlet sieve tube (18) through the tee joint and a valve D (17); the two ends of the flow passage (26) are respectively connected with an inlet flange (16) and an outlet flange (13); the upper cover of the metering tank (10) is downwards provided with a chemical reagent injection port (1), a temperature sensor (2), an oil-gas interface sensor (3), an oil-water interface sensor (5) and a pressure sensor (7); a bypass valve C (15) is connected on a flow passage (26) between the proportional valve B (14) and the valve D (17);
the method is characterized in that: the method comprises the following steps:
1) the first step is as follows: gas phase measurement process:
opening a valve D (17) and a proportional valve A (6), closing a proportional valve B (14) and a valve C (15), enabling oil-gas-water three-phase fluid to enter from an inlet flange (16), enabling the oil-gas three-phase fluid to rise to a specific position h5 at the upper part of a metering tank (10) through an oil-gas interface of the valve D (17) and a liquid inlet sieve tube (18), opening a liquid inlet control valve D (17) and the proportional valve B (14), closing an upper outlet proportional valve A (6) and a bypass valve C (15), starting timing, slowly accumulating gas phase at the upper part of the metering tank (10) and forcing oil-water to flow out from a lower liquid outlet (12), finishing timing when the oil-gas interface reaches a specific position h1 at the bottom of the metering tank (10), measuring the displacement h5-h1 of the oil-gas interface at the time by an oil-gas interface sensor (3), adding a pressure sensor (7), a temperature sensor (2) and, the flow rate of the gas phase in the standard state can be obtained;
2) the second step is that: water measuring process
Opening a valve D (17) and a proportional valve B (14), closing a valve C (15) and a proportional valve A (6), slowly accumulating gas phase, when an oil-gas interface sensor detects that an oil-gas interface reaches the bottommost end of a metering tank, the metering tank is in a fully inflated state, opening the valve D (17) and the proportional valve A (6), closing the proportional valve B (14) and the valve C (15), enabling oil-gas-water three-phase fluid to enter from an inlet flange (16), enter into the metering tank through the valve D (17) and a sieve tube (18), layering of gas, oil and water in the metering tank from top to bottom, slowly moving upwards, starting timing when an oil-water interface (21) rises to a specific position h1 of the metering tank (10), opening a bypass valve C (15), closing the upper outlet proportional valve A (6), a liquid inlet control valve D (17) and a lower liquid outlet proportional valve B (14) when the oil-water interface rises to a specific position h5 of the upper part of the metering tank (10), stopping timing; at the moment, the metering tank intercepts three-phase fluid for a period of time, and after proper gravity differentiation, when the moving speed of an oil-water interface meets the requirement, the oil-water interface sensor (5) measures the height of a water phase; the flow rate of the water phase can be obtained by combining the measurement time, the actual moving height of the water phase and the sectional area of each part of the metering tank;
3) the third step: oil phase measurement process
Opening a valve D (17) and a proportional valve B (14), closing a valve C (15) and a proportional valve A (6), slowly accumulating gas phase, when an oil-gas interface sensor detects that an oil-gas interface reaches the bottommost end of a metering tank, the metering tank is in a fully inflated state, opening the valve D (17) and the proportional valve A (6), closing the proportional valve B (14) and the valve C (15), starting timing, entering oil-gas-water three-phase fluid from an inlet flange (16), entering the metering tank through the valve D (17) and a sieve tube (18), generating layering arrangement of gas, oil and water from top to bottom due to gravity difference, slowly moving upwards, when the oil-gas interface completely rises to a specific position h4 on the upper part of the metering tank (10), detecting the oil-gas interface height by the oil-gas interface sensor (3), detecting the oil-water interface height by the oil-water interface sensor (5), and when the height difference between the oil-gas interface height and, adjusting proper opening degrees of a proportional valve A (6) and a proportional valve B (14), enabling a gas phase to flow out from an upper gas outlet (4), enabling a water phase to flow out from a lower liquid outlet (12), enabling an oil phase to be clamped in a necking partial oil area (22) in the middle of a metering tank by steam and water, reducing a certain opening degree of the proportional valve A (6) and increasing a certain opening degree of the proportional valve B (14) if a gas-oil interface (24) shows an upward movement sign, reducing a certain opening degree of the valve B (14) and increasing a certain opening degree of the valve A (6) if the gas-oil interface (24) shows a downward movement sign, and always keeping the gas-oil interface (24) near a specific height of the upper part of the metering tank (10); when the height difference between the oil-gas interface (24) and the oil-water interface (21) is larger than or equal to a specific value, timing is stopped, the valve C (15) is opened, and the proportional valve A (6), the proportional valve B (14) and the valve D (17) are closed; at the moment, the metering tank (10) intercepts the oil phase for a period of time, after gravity differentiation for a proper time, water is separated from the oil phase, the oil-water interface (21) moves upwards, and when the moving distance of the oil-water interface (21) at a specified time meets the requirement, the oil-gas interface sensor (3) and the oil-water interface sensor (5) measure the height of the oil phase; and the flow rate of the oil phase can be obtained by combining the measuring time and the sectional area of each part of the metering tank.
2. A metering method according to claim 1, characterized in that: and a heating element (11) is wound on the outer wall of the metering tank (10).
3. A metering method according to claim 1, characterized in that: and a crude oil electric dehydration instrument (19) is arranged at the bottom of the metering tank (10).
4. A metering method according to claim 1, characterized in that: the metering tank (10) is an I-shaped metering tank, and the bottom end of the middle necking section of the metering tank is h2 away from the bottom of the tank, and the top end of the middle necking section of the metering tank is h4 away from the bottom of the tank.
5. A metering method according to claim 1, characterized in that: the metering tank (10) is divided into a water area (20), an oil-water interface (21), an oil area (22), an oil-gas interface (24) and a gas area (25) from bottom to top.
6. A metering method according to claim 1, characterized in that: in the steps 2) and 3), the power can be supplied to the heating element (11) and the crude oil electric dehydration instrument (19), so that the separation time is shortened; an appropriate amount of reagent can be added through the chemical reagent injection orifice (1).
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| CN109444382B (en) * | 2018-10-11 | 2019-07-09 | 江苏华尔威科技集团有限公司 | A kind of crude oil single well metering system with transporting function |
| CN111206918B (en) * | 2020-03-25 | 2024-10-01 | 新疆金牛能源物联网科技股份有限公司 | Oil well metering equipment |
| CN112985503B (en) * | 2021-02-20 | 2022-04-05 | 山东万盛电气有限公司 | Online measuring device and method for oil-water two-phase flow holdup and flow velocity |
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