CN210036845U - Oil-water two-phase flow measuring device based on dynamic rotation centrifugal pressure difference method and flowmeter - Google Patents
Oil-water two-phase flow measuring device based on dynamic rotation centrifugal pressure difference method and flowmeter Download PDFInfo
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Abstract
The utility model discloses an oil-water two-phase flow measuring device based on a power rotating centrifugal differential pressure method and a flowmeter, which comprises an inlet connecting flange, an inlet pipe, a power rotating pipe, an outlet pipe and an outlet connecting flange which are coaxial from an inlet end to an outlet end; the inner diameters of the inlet pipe, the power rotating pipe and the outlet pipe are the same, a liquid flow meter is arranged on the pipe wall of the inlet pipe, and bearings and seal boxes are arranged on the outer walls of the two ends of the power rotating pipe; a gear box is arranged on the outer wall of the middle of the power rotating pipe, a motor is arranged on the gear box, and a differential pressure sensor is connected to the outer wall of the outlet pipe. The device is used for measuring and obtaining the radial centrifugal pressure difference delta P generated by the high-speed rotation of the oil-water two-phase flow and the mixture of the oil-water two-phase flowTotal volume flow rate Qm(ii) a Then, the flow Q of the oil phase in the oil-water two-phase flow is obtainedoAnd flow rate of the aqueous phase Qw. The utility model has wide application range and high measurement precision; the range is convenient to adjust; the method is safe, reliable and good in economical efficiency; compact structure and convenient installation.
Description
Technical Field
The utility model relates to a heterogeneous flow measures technical field, concretely relates to profit two-phase flow measuring device based on rotatory centrifugal differential pressure method of power and flowmeter.
Background
The oil-water two-phase flow phenomenon widely exists in the oil exploitation process, and the determination of the flow rate of oil, the flow rate of water, the water content (or oil content) and the like in the oil-water two-phase flow is a main task of oil-water two-phase measurement. The real-time measurement of the oil-water two-phase flow has important significance for predicting the yield of an oil well, predicting the development life of the oil well, controlling the yield and quality of the oil field, detecting the state of the oil well and reducing the cost, and is also an inevitable requirement for realizing the digital and intelligent management of the oil field.
The oil-water two-phase flow measurement belongs to the technical field of multi-phase flow measurement, and due to the difference of the physical properties of oil phase and water phase, the inter-phase slip characteristic and the interface effect of complex mixed fluid are caused, the flow parameters of the mixed fluid are difficult to accurately measure, and the problems also determine that the oil-water two-phase flow measurement is a difficult problem, and special research needs to be carried out on a measuring device and a measuring method of the oil-water two-phase flow measurement.
The current main oil-water two-phase measuring methods can be roughly divided into three types:
1) the method comprises the steps of manually sampling, testing and analyzing at regular intervals, and measuring once per hour or hours in a manual mode, so that the difference between the actual single-well yield and the calculated yield is large, and the final error is quite large due to the error of manual calculation, the significance of measurement is lost, and the problems of low efficiency, poor real-time performance and the like exist;
2) the method has the advantages that a large separation tank is adopted to separate oil, gas and water and then the oil, gas and water are respectively metered by a single-phase flowmeter, and the measurement mode has the problems of high early-stage investment cost, large volume, complex equipment, long flow stabilization time during measurement, poor measurement real-time performance and the like;
3) a multiphase flowmeter is adopted to measure oil-water two-phase flow, the total flow of an oil-water mixture is mainly measured through a conventional liquid flowmeter, and then a phase content meter designed based on the principles of a capacitance method or an electric conduction method, a ray method, a microwave method, an ultrasonic method, an optical method, a nuclear magnetic resonance method and the like is combined to measure the water content or the oil content. The multiphase flowmeter has the advantages of compact structure, continuous measurement and suitability for wellhead installation, but no multiphase flowmeter can be widely popularized and applied in oil fields, because various phase content measuring methods have limitations.
The Chinese invention patent applications with the application numbers of 201810385910.4, 201810127004.4, 201710465817.X, 201510317304.5 and 201110247206.0 all adopt an electrical method (a capacitance method or an electrical conduction method) to measure the phase content of oil-water two-phase flow, for the method, the sensor response has nonlinearity and low response resolution, so that the precision is difficult to reach the measurement requirement, the electrical conduction method is only suitable for the oil-water two-phase flow with water as a continuous phase, while the capacitance rule is only suitable for the oil-water two-phase flow with oil as a continuous phase, and the measurement precision is difficult to guarantee when the oil-water is emulsified. The united states patents US5689540A and US3498112A respectively introduce a ray method and a microwave method for measuring oil-water two-phase flow, and for the ray method and the microwave method, the radiation pollution and the safety problem exist, and the price is high, so that the popularization and the application of the method are limited; the Chinese patent with application number 201610519665.2 and the U.S. Pat. No. 3, 20180088083A1 relate to a technology for measuring oil-water two-phase flow by an ultrasonic method, the Chinese patent with application number CN201120504236.0 relates to a technology for measuring the water content of crude oil by an infrared imaging photometry, and for the ultrasonic method and the optical method, related theoretical research is not sufficient, and the technology and the process are not mature enough. The method for measuring oil-water two-phase flow by using nuclear magnetic resonance method is introduced in the U.S. Pat. No. 20180238819a1, and although satisfactory measurement accuracy can be obtained, the high measurement cost of the method only limits the application in the laboratory, and the method is difficult to be widely popularized in oil field enterprises. The chinese patent No. 200420022874.9 describes a method for measuring oil-water two-phase flow by using a combination of a venturi tube and an elastic scraper flowmeter, but the technique of measuring according to a two-phase flow throttling pressure drop model has the problem of large pressure loss, which affects the transportation of oil well production fluid.
In conclusion, the existing oil-water two-phase flow measuring technology has the defects, so that the wide-range application of the oil-water two-phase flow measuring technology in oil field enterprises is limited. Therefore, the oil-water two-phase real-time measuring device has the advantages of high measuring precision, wide application range, simple structure, no radiation, safety, environmental protection, stable work, low cost, small resistance and small influence on a conveying pipe network, and has very important engineering application value.
Disclosure of Invention
An object of the utility model is to overcome prior art not enough, provide an oil water two-phase flow measuring device based on rotatory centrifugal pressure differential method of power and flowmeter, through adopting the rotatory spiral flow technique of power, force the reconsitution for the spiral flow type with oil water two-phase flow, through the centrifugal pressure difference in measuring the spiral flow field, utilize the relation model of centrifugal pressure difference and the two-phase content rate of profit, combine the mixed flow of the oil water two-phase flow that conventional liquid flowmeter measured and obtained, accomplish the measurement of oil water two-phase flow.
In order to achieve the purpose, the utility model designs an oil-water two-phase flow measuring device based on a power rotating centrifugal differential pressure method and a flowmeter, which comprises an inlet connecting flange, an inlet pipe, a power rotating pipe, an outlet pipe and an outlet connecting flange which are coaxial from an inlet end to an outlet end; the inner diameters of the inlet pipe, the power rotating pipe and the outlet pipe are the same, a liquid flow meter is arranged on the pipe wall of the inlet pipe, and bearings and seal boxes are arranged on the outer walls of the two ends of the power rotating pipe; a gear box is arranged on the outer wall of the middle of the power rotating pipe, a motor is arranged on the gear box, and a differential pressure sensor is connected to the outer wall of the outlet pipe.
Further, an axial flow impeller is coaxially installed inside the power rotating pipe, and the axial flow impeller is in close contact with the inner wall of the power rotating pipe.
Still further, the bearing and the seal box comprise a shaft seal box body with an opening at one end and arranged on the outer wall of the power rotating pipe, the bearing is arranged at the opening of the shaft seal box body, a shaft seal for sealing is arranged in the shaft seal box body, fixed pipe grooves are respectively arranged on the pipe walls of the joints of the inlet pipe and the outlet pipe and the power rotating pipe, and the bearing, the seal box and the power rotating pipe are fixed in the fixed pipe grooves.
Furthermore, the differential pressure sensor comprises a sensor body, a wall pressure tapping pipe and a central pressure tapping pipe, wherein the wall pressure tapping pipe and the central pressure tapping pipe are respectively communicated with a high-pressure port and a low-pressure port of the sensor body; the central pressure sampling pipe and the wall pressure sampling pipe are arranged on two sides of the pipe wall of the outlet pipe from the inlet end to the outlet end of the outlet pipe in a front-back mode; the central pressure sampling pipe extends into the outlet pipe, and the end part of the central pressure sampling pipe is connected and sealed with the pipe wall of the outlet pipe; a central pressure-taking hole is formed in the pipe wall in the center of the central pressure-taking pipe in the outlet pipe, the central pressure-taking hole and the outlet pipe are coaxial, and the opening direction of the central pressure-taking pipe is the same as the outlet direction; the axes of the central pressure-taking hole and the wall pressure-taking hole of the wall pressure-taking pipe are positioned on the same pipeline cross section (the axes of the central pressure-taking hole and the wall pressure-taking hole are positioned on the same pipeline cross section so as to ensure that the pressure difference of the two pressure-taking pipes is the pressure difference of the same truncation section).
Still further, the distance between the wall pressure sampling pipe and the central pressure sampling pipe and the inlet of the outlet pipe is smaller than the inner diameter D of the outlet pipe.
Still further, a driving gear and a driven gear which are meshed with each other are arranged in the gear box, the driven gear is arranged outside the power rotating pipe, the motor is inserted into the driving gear through a motor shaft and is connected with the gear box, and a motor power sensor is arranged on the side wall of the motor.
Still further, the liquid flow meter is selected from the group consisting of a turbine flow meter, a roots meter, a blade meter, an oval gear flow meter, a vortex shedding flow meter, a differential pressure flow meter, a coriolis mass flow meter, and an ultrasonic flow meter. The liquid flowmeter is used for measuring the mixed flow of oil and water phases.
The measuring method of the oil-water two-phase flow measuring device based on the dynamic rotation centrifugal pressure difference method and the flowmeter comprises the following steps:
1) the oil-water two-phase flow enters the inlet pipe from the device inlet and then enters the power rotating pipe;
2) the power rotating pipe rotates at a high speed under the action of the motor through the driven gear and the driving gear, and the axial flow impeller rotates along with the rotation of the power rotating pipe; the oil-water two-phase flow entering the power rotating pipe flows along the axial direction, and simultaneously, the oil-water two-phase flow rotates at an accelerated speed under the action of the power rotating pipe and the axial flow impeller and is converted into forced spiral flow, the oil-water two-phase flow is under the action of centrifugal force in the rotating process, the water phase with higher density is thrown to the pipe wall side under the action of the centrifugal force, the oil phase with lower density is gathered to the center of the pipeline under the action of the centrifugal force, and radial centrifugal pressure difference caused by the action of the centrifugal force is generated at the pipe wall and the center of the pipeline;
3) the oil-water two-phase flow flows out of the power rotating pipe and still rotates at a high speed after entering the outlet pipe, the pressure at the wall surface is introduced into the high-pressure side of the differential pressure sensor through the wall surface pressure taking hole and the wall surface pressure taking pipe, the pressure at the center of the pipeline is introduced into the low-pressure side of the differential pressure sensor through the center pressure taking hole and the center pressure taking pipe, and the radial centrifugal differential pressure delta P generated by the oil-water two-phase flow rotating at a high speed is measured through; mixed volume flow Q of oil-water two-phase flowmMeasuring by a conventional liquid flow meter;
4) under the conditions of the inner diameter D of the rotating pipe and the rotating speed n of the motor, the differential pressure delta P measured by the differential pressure sensor is substituted into the formula (1), and the oil-water mixed volume flow Q measured by the liquid flowmetermSubstituting the formula (2) into the formula (2), and then simultaneously solving to obtain the flow Q of the oil phase in the oil-water two-phase flowoAnd flow rate of the aqueous phase Qw(ii) a Wherein,
a. radial centrifugal pressure difference delta P and oil-phase volume flow Q in oil-water two-phase flowoAnd the volume flow rate Q of the aqueous phasewThe relationship of (1) is:
in the above formula, Δ P is the radial centrifugal pressure difference in Pa; n is the motor speed in r/s; d is the inner diameter of the rotating pipe and is unit m; rhowThe density of the aqueous phase is in kg/m3；ρoIs the density of the oil phase in kg/m3；QoIs the volume flow of the oil phase, and has the unit of m3/s；QwIs the volume flow of the aqueous phase in m3/s；
C1，C2The experimental parameters are dimensionless empirical coefficients which are related to the section position, the structure of the cyclone and the Reynolds number and need to be calibrated through experiments;
b. mixed volume flow Q of oil-water two-phase flowmVolume flow Q of oil phase in oil-water two-phase flowoAnd the volume flow rate Q of the aqueous phasewThe relationship of (1) is:
Qm＝Qw+Qo(2)
in the above formula, QmIs the mixed volume flow of oil-water two-phase flow, and has unit m3/s；QoIs the volume flow of the oil phase, and has the unit of m3/s；QwIs the volume flow of the aqueous phase in m3/s。
The utility model has the advantages that:
(1) the application range is wide, and the measurement accuracy is high. The utility model relates to an oil-water two-phase flow measuring principle does not rely on the flow pattern and the phase content of oil-water two-phase flow, can measure oil-water two-phase flow under the condition of arbitrary oil-water two-phase flow pattern and oil-water ratio, and is wider in application range and higher in precision compared with measuring means such as a capacitance method and an electric conduction method;
(2) the resistance loss is small. The power rotating pipe and the axial flow impeller have double functions of rotating acceleration and axial pushing on flowing oil-water two-phase flow, the energy head of the oil-water two-phase flow can be improved, further the pressure loss caused by an upstream conventional liquid flow meter is made up, the influence on a conveying pipe network is reduced, and the optional range of the conventional liquid flow meter is expanded.
(3) The measuring range is convenient to adjust, and the flow measurement range is large. The range of the measuring range can be adjusted by adjusting the rotating speed of the motor or changing the transmission ratio of the gear; the device has good measurement resolution and precision in large flow, and can also obtain higher measurement precision by increasing the rotating speed of the motor or increasing the transmission ratio when the flow of the oil-water two-phase flow is smaller.
(4) The method is safe, reliable and good in economical efficiency. The oil-water two-phase flow measuring technology does not need to adopt methods such as microwave or gamma ray to measure the phase content, does not have radiation hidden danger and environmental problem, and is safer and more reliable in work; in addition, the measuring device has simple structure and processing technology and low production and manufacturing cost.
(5) Compact structure and convenient installation. The utility model relates to an oil-water two-phase flow measuring technique belongs to the oil-water non-separation measurement, compared with the traditional oil-water separation measuring method by using a separator, the structure is more compact, the occupied area is small, and the continuous real-time measurement of oil-water can be realized; the requirement on the length of a straight pipe section is low, the installation is convenient, and the device is suitable for horizontal installation and vertical installation.
Drawings
Fig. 1 is an external view of a two-phase oil-water flow measuring device based on a dynamic rotating centrifugal differential pressure method and a flowmeter according to the present invention, wherein arrows indicate the flow direction of a fluid;
fig. 2 is a cross-sectional view of an oil-water two-phase flow measuring device based on a dynamic rotating centrifugal differential pressure method and a flow meter according to the present invention, wherein arrows indicate the flow direction of the fluid;
in the figure: the device comprises an inlet pipe 1, an outlet pipe 2, a power rotating pipe 3, an axial flow impeller 3.1, a bearing and seal box 4, a shaft seal box body 4.1, a bearing 4.2, a shaft seal 4.3, a fixed pipe groove 5, a motor 6, a motor shaft 6.1, a motor power sensor 6.2, a gear box 7, a driving gear 7.1, a driven gear 7.2, a liquid flowmeter 8, a differential pressure sensor 9, a sensor body 9.1, a wall pressure tapping pipe 9.2, a wall pressure tapping hole 9.21, a center pressure tapping pipe 9.3, a center pressure tapping hole 9.31, an inlet connecting flange 10 and an outlet connecting flange 11.
Detailed Description
The present invention is described in further detail below with reference to specific embodiments so that those skilled in the art can understand the invention.
The oil-water two-phase flow measuring device based on the dynamic rotation centrifugal pressure difference method and the flowmeter as shown in the figures 1-2 sequentially comprises an inlet connecting flange 10, an inlet pipe 1, a dynamic rotation pipe 3, an outlet pipe 2 and an outlet connecting flange 11 which are coaxial from an inlet end to an outlet end; the inner diameters of the inlet pipe 1, the power rotating pipe 3 and the outlet pipe 2 are the same, a liquid flowmeter 8 is arranged on the pipe wall of the inlet pipe 1, and bearings and a seal box 4 are arranged on the outer walls of two ends of the power rotating pipe 3;
the bearing and seal box 4 comprises a shaft seal box body 4.1 with an opening at one end and arranged on the outer wall of the power rotating pipe 3, a bearing 4.2 is arranged at the opening of the shaft seal box body 4.1, a shaft seal 4.3 for sealing is arranged in the shaft seal box body 4.1, fixed pipe grooves 5 are arranged on the pipe walls of the joints of the inlet pipe 1 and the outlet pipe 2 and the power rotating pipe 3, and the bearing and seal box 4 and the power rotating pipe 3 are fixed in the fixed pipe grooves 5;
the gear box 7 is arranged on the outer wall of the middle of the power rotating pipe 3, the motor 6 is arranged on the gear box 7, a driving gear 7.1 and a driven gear 7.2 which are mutually meshed are arranged in the gear box 7, the driven gear 7.2 is arranged outside the power rotating pipe 3, the motor 6 is inserted into the driving gear 7.1 through a motor shaft 6.1 and is connected with the gear box 7, and a motor power sensor 6.2 is arranged on the side wall of the motor 6. An axial flow impeller 3.1 is coaxially arranged in the power rotating pipe 3 corresponding to the motor 6, and the axial flow impeller 3.1 is tightly contacted with the inner wall of the power rotating pipe 3;
the outer wall of the outlet pipe 2 is connected with a differential pressure sensor 9. The differential pressure sensor 9 comprises a sensor body 9.1, a wall pressure sampling pipe 9.2 and a center pressure sampling pipe 9.3, wherein the wall pressure sampling pipe 9.2 and the center pressure sampling pipe 9.3 are respectively communicated with a high-pressure port and a low-pressure port of the sensor body 9.1; the central pressure tapping pipe 9.3 and the wall surface pressure tapping pipe 9.2 are arranged at two sides of the pipe wall of the outlet pipe 2 from the inlet end to the outlet end of the outlet pipe 2; the distance between the wall pressure sampling pipe 9.2 and the central pressure sampling pipe 9.3 and the inlet of the outlet pipe 2 is less than the inner diameter D of the outlet pipe. The central pressure tapping pipe 9.3 extends into the outlet pipe 2, and the end part of the central pressure tapping pipe is connected and sealed with the pipe wall of the outlet pipe 2; a central pressure taking hole 9.31 is formed in the pipe wall in the center of the central pressure taking pipe 9.3 in the outlet pipe 2, the central pressure taking hole 9.31 and the outlet pipe 2 are coaxial, and the opening direction of the central pressure taking hole 9.31 is the same as the outlet direction; the central pressure taking hole 9.31 and the axis of the wall pressure taking pipe 9.21 of the wall pressure taking pipe 9.2 are positioned on the same pipeline cross section;
the liquid flowmeter 8 is selected from the group consisting of a turbine flowmeter, a roots flowmeter, a blade flowmeter, an oval gear flowmeter, a vortex shedding flowmeter, a differential pressure flowmeter, a coriolis mass flowmeter, and an ultrasonic flowmeter. The liquid flowmeter 8 is used for measuring the mixed flow of oil and water.
The measuring method of the oil-water two-phase flow measuring device based on the dynamic rotation centrifugal pressure difference method and the flowmeter comprises the following steps:
1) oil-water two-phase flow enters an inlet pipe 1 from an inlet of the device and then enters a power rotating pipe 3;
2) the power rotating pipe 3 rotates at a high speed under the action of the motor 6 through the driven gear 7.2 and the driving gear 7.1, and the axial flow impeller 3.1 rotates along with the rotation of the power rotating pipe 3; the oil-water two-phase flow entering the power rotating pipe 3 flows along the axial direction, and simultaneously, the oil-water two-phase flow rotates at an accelerated speed under the action of the power rotating pipe 3 and the axial flow impeller 3.1 and is converted into forced spiral flow, the oil-water two-phase flow is acted by centrifugal force in the rotating process, the water phase with higher density is thrown to the pipe wall side under the action of the centrifugal force, the oil phase with lower density is gathered to the center of the pipeline under the action of the centrifugal force, and radial centrifugal pressure difference caused by the action of the centrifugal force is generated at the pipe wall and the center of the pipeline on the same;
3) the oil-water two-phase flow flows out of the power rotating pipe and still rotates at a high speed after entering the outlet pipe, the pressure at the wall surface is introduced into the high-pressure side of the pressure difference sensor 9 through the wall surface pressure taking hole and the wall surface pressure taking pipe 9.2, the pressure at the center of the pipeline is introduced into the low-pressure side of the pressure difference sensor 9 through the center pressure taking hole 9.31 and the center pressure taking pipe 9.3, and the radial centrifugal pressure difference delta P generated by the oil-water two-phase flow rotating at a high speed is measured through the; mixing of oil and water two-phase flowTotal volume flow rate QmMeasuring by a conventional liquid flow meter;
4) under the conditions of the inner diameter D of the power rotating pipe 3 and the rotating speed n of the motor 6, the pressure difference delta P measured by the pressure difference sensor 9 is substituted into the formula (1), and the oil-water mixed volume flow Q measured by the liquid flowmeter 8mSubstituting the formula (2) into the formula (2), and then simultaneously solving to obtain the flow Q of the oil phase in the oil-water two-phase flowoAnd flow rate of the aqueous phase Qw(ii) a Wherein,
a. radial centrifugal pressure difference delta P and oil-phase volume flow Q in oil-water two-phase flowoAnd the volume flow rate Q of the aqueous phasewThe relationship of (1) is:
in the above formula, Δ P is the radial centrifugal pressure difference in Pa; n is the motor speed in r/s; d is the inner diameter of the rotating pipe and is unit m; rhowThe density of the aqueous phase is in kg/m3；ρoIs the density of the oil phase in kg/m3；QoIs the volume flow of the oil phase, and has the unit of m3/s；QwIs the volume flow of the aqueous phase in m3/s；
C1，C2The experimental parameters are dimensionless empirical coefficients which are related to the section position, the structure of the cyclone and the Reynolds number and need to be calibrated through experiments;
b. mixed volume flow Q of oil-water two-phase flowmVolume flow Q of oil phase in oil-water two-phase flowoAnd the volume flow rate Q of the aqueous phasewThe relationship of (1) is:
Qm＝Qw+Qo(2)
in the above formula, QmIs the mixed volume flow of oil-water two-phase flow, and has unit m3/s；QoIs the volume flow of the oil phase, and has the unit of m3/s；QwIs the volume flow of the aqueous phase in m3/s。
Other parts not described in detail are prior art. Although the above embodiments have been described in detail, it is only a part of the embodiments of the present invention, rather than all embodiments, and other embodiments can be obtained without inventive step according to the present embodiments.
Claims (7)
1. An oil-water two-phase flow measuring device based on a power rotation centrifugal pressure difference method and a flowmeter is characterized in that: the device comprises an inlet connecting flange (10), an inlet pipe (1), a power rotating pipe (3), an outlet pipe (2) and an outlet connecting flange (11) which are coaxial from an inlet end to an outlet end in sequence; the inner diameters of the inlet pipe (1), the power rotating pipe (3) and the outlet pipe (2) are the same, a liquid flowmeter (8) is arranged on the pipe wall of the inlet pipe (1), and bearings and a seal box (4) are arranged on the outer walls of the two ends of the power rotating pipe (3); a gear box (7) is arranged on the outer wall of the middle of the power rotating pipe (3), a motor (6) is arranged on the gear box (7), and a differential pressure sensor (9) is connected to the outer wall of the outlet pipe (2).
2. The oil-water two-phase flow measuring device based on the dynamic rotating centrifugal pressure difference method and the flow meter according to claim 1, characterized in that: the axial-flow impeller (3.1) is coaxially arranged in the power rotating pipe (3), and the axial-flow impeller (3.1) is in close contact with the inner wall of the power rotating pipe (3).
3. The oil-water two-phase flow measuring device based on the dynamic rotating centrifugal pressure difference method and the flow meter according to claim 1, characterized in that: the bearing and the seal box (4) comprise a shaft seal box body (4.1) with an opening at one end and arranged on the outer wall of the power rotating pipe (3), the bearing (4.2) is arranged at the opening of the shaft seal box body (4.1), a shaft seal (4.3) used for sealing is arranged in the shaft seal box body (4.1), a fixed pipe groove (5) is formed in the pipe wall of the joint of the inlet pipe (1) and the outlet pipe (2) and the power rotating pipe (3), and the bearing and the seal box (4) and the power rotating pipe (3) are fixed in the fixed pipe groove (5).
4. The oil-water two-phase flow measuring device based on the dynamic rotating centrifugal pressure difference method and the flow meter according to claim 1, characterized in that: the pressure difference sensor (9) comprises a sensor body (9.1), a wall pressure sampling pipe (9.2) and a center pressure sampling pipe (9.3), wherein the wall pressure sampling pipe (9.2) and the center pressure sampling pipe (9.3) are respectively communicated with a high-pressure port and a low-pressure port of the sensor body (9.1); the central pressure sampling pipe (9.3) and the wall pressure sampling pipe (9.2) are arranged on two sides of the pipe wall of the outlet pipe (2) from the inlet end to the outlet end of the outlet pipe (2) in a front-back manner; the central pressure sampling pipe (9.3) extends into the outlet pipe (2) and the end part of the central pressure sampling pipe is connected and sealed with the pipe wall of the outlet pipe (2); a central pressure-taking hole (9.31) is formed in the pipe wall in the center of the central pressure-taking pipe (9.3) in the outlet pipe (2), the central pressure-taking hole (9.31) and the outlet pipe (2) are coaxial, and the opening direction of the central pressure-taking hole (9.31) is the same as the outlet direction; the axes of the central pressure sampling hole (9.31) and the wall pressure sampling hole (9.21) of the wall pressure sampling pipe (9.2) are positioned on the same pipeline cross section.
5. The oil-water two-phase flow measuring device based on the dynamic rotating centrifugal pressure difference method and the flow meter according to claim 4, characterized in that: the distance between the wall surface pressure sampling pipe (9.2) and the central pressure sampling pipe (9.3) and the inlet of the outlet pipe (2) is less than the inner diameter D of the outlet pipe.
6. The oil-water two-phase flow measuring device based on the dynamic rotating centrifugal pressure difference method and the flow meter according to claim 1, characterized in that: a driving gear (7.1) and a driven gear (7.2) which are mutually meshed are arranged in the gear box (7), the driven gear (7.2) is arranged outside the power rotating pipe (3), the motor (6) is inserted into the driving gear (7.1) through a motor shaft (6.1) and is connected with the gear box (7), and a motor power sensor (6.2) is arranged on the side wall of the motor (6).
7. The oil-water two-phase flow measuring device based on the dynamic rotating centrifugal pressure difference method and the flow meter according to claim 1, characterized in that: the liquid flow meter (8) is selected from the group consisting of a turbine flow meter, a roots meter, a blade flow meter, an oval gear flow meter, a vortex shedding flow meter, a differential pressure flow meter, a coriolis force mass flow meter, and an ultrasonic flow meter.
Priority Applications (1)
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