CN106092236A - A kind of multiphase flow metering detecting system - Google Patents

Abstract

The present invention provides a kind of multiphase flow metering detecting system, and system includes Venturi tube, pressure module, capacitance chromatography imaging module, Electrical Resistance Tomography module, ultrasound detection module and data acquisition and procession unit；The upstream of Venturi tube, throat and downstream are respectively arranged with above-mentioned module；Data acquisition and procession unit electrically connects with pressure module, capacitance chromatography imaging module, Electrical Resistance Tomography module, ultrasound detection module and differential pressure transmitter, for gathering and process the data of each functional module.Electrical capacitance tomography, Electrical Resistance Tomography, ultrasonic detecting technology are combined by this detecting system with venturi, utilize the combined signal of each sensor to solve multiphase flow rates；And be standardized module form by each sensor design so that it is the position on venturi can change flexibly, measures position and provides the multiphase flow of different flow patterns by adjusting and accurately measure；Having simple in construction, signal extraction is stable, response frequency advantages of higher.

Description

A kind of multiphase flow metering detecting system

Technical field

The present invention relates to the multiphase flow meterings such as oil-gas-water in oil and gas industry and measure the technical field of equipment, particularly relate to A kind of multiphase flow metering detecting system.

Background technology

According to exploration, whole South China Sea Basin group's petroleum geology stock number is about between 230 hundred million to 300 hundred million tons, and natural gas is generally Matter stock number is about 16 tcms, accounts for 1/3rd of Chinese Petroliferous total resources, wherein 70% contain in 153.7 ten thousand flat The region, deep-sea of Fang Gongli.Along with the continuous consumption of Land petroleum surplus resources, the demand day that marine oil and gas is exploited by industrial quarters Benefit improves, and Multiphase Fluid Measurement Technology also becomes industry focus of attention under water.

And in China's offshore oil and gas industry, condensation natural gas (biphase) is separated by the traditional gas gathering station of life-time service, Use single-phase flow instrument that the medium after separating is measured again.Though this way can ensure certain measuring accuracy, but its fraud Hold the most fairly obvious.The construction at separate measurement station not only somewhat expensive, it is often more important that zones and surface areas for joint exploration and exploitation are typically only capable of building One separate measurement station, the numerous natural gas well yields in this block can only be measured the most in turn, and then cannot be met The demand that every a bite well yield information is monitored by oil company in real time.

Patent 103076057A proposes a kind of carried out containing rate analysis oil-gas-water is heterogeneous by the dampening information of X-ray Metering method.Though the method can have higher discrimination to the liquid phase in multiphase flow, but has a disadvantage in that used radiation Property scheme is to there is bigger potential safety hazard, and the industrial quarters in China also rarely has utilization.

Patent 202252857U proposes, by heterogeneous fluid being mixed and accelerating, after forming symmetrical annular flow, Again it is carried out two-stage shunting: annular flow is divided into 16 symmetrical independent flow passage, take the most evenly spaced four strands It is a road, the method separate the most again, measured respectively.Due to core or the separate measurement of its technology, therefore there is structure multiple The weakness such as miscellaneous crushing is limited compared with big and measurement efficiency.

Summary of the invention

The invention provides a kind of multiphase flow metering detecting system, it is possible to solve prior art detects multiphase flow metering The technical problem that Apparatus and method for process is complicated.

For solving above-mentioned technical problem, the technical scheme that the present invention uses is: provide a kind of multiphase flow metering detection System, described system includes Venturi tube, pressure module, capacitance chromatography imaging module, Electrical Resistance Tomography module, ultrasound detection Module and data acquisition and procession unit；The upstream of described Venturi tube, throat and downstream are respectively arranged with described pressure Module, described capacitance chromatography imaging module, described Electrical Resistance Tomography module and described ultrasound detection module, adjacent described in take Connect between die block and have differential pressure transmitter, in order to measure the pressure difference value between diverse location pressure module；Described data acquisition Collect and processing unit and described pressure module, described capacitance chromatography imaging module, described Electrical Resistance Tomography module, described ultrasonic Detection module and the electrical connection of described differential pressure transmitter, for gathering and process the data of each functional module.

According to one preferred embodiment of the present invention, described detecting system also includes the pressure inverting being located at Venturi tube upstream Device, described pressure transmitter is for detecting the force value of Venturi tube upstream position.

According to one preferred embodiment of the present invention, detecting system also includes the temperature transmitter being located at Venturi tube downstream, institute State temperature transmitter for detecting the temperature value of Venturi tube downstream position.

According to one preferred embodiment of the present invention, the throat of described Venturi tube is provided with two pressure modules, and two pressures Spacing between module is not less than 200mm.

According to one preferred embodiment of the present invention, it is provided with contraction section, larynx between upstream and the throat of described Venturi tube Expansion segment it is provided with between portion and downstream pipe；Described upstream, described contraction section, described throat, described expansion segment and institute State and connected by flange arrangement between downstream pipe.

According to one preferred embodiment of the present invention, the pressure module that upstream is arranged is more than with the initiating terminal distance of contraction section 0.5D；The pressure module of downstream setting and the end distance of expansion segment are more than 6D, and wherein, D is upstream or downstream pipe Interior diameter.

According to one preferred embodiment of the present invention, described pressure module, described capacitance chromatography imaging module, described resistance chromatography Image-forming module and described ultrasound detection module all use flange arrangement and the upstream of described Venturi tube, throat and under Play pipe road connects.

According to one preferred embodiment of the present invention, the parameter that each functional module is measured meets below equation:Wherein, W_GFor gas phase quality stream Amount, A is gas phase circulation area, A_GIt is gas phase circulation area, A_LIt is liquid phase circulation area, U_GFor the true flow velocity of gas phase, τ_GWFor gas phase And the shear stress between tube wall, τ_iFor the shear stress between gas phase and liquid film, τ_LWIt is the shear stress between liquid phase and tube wall, S_GWFor The length that on pipeline section, gas phase contacts with tube wall, S_LWIt is the contact length of liquid phase and tube wall, S_iFor gas phase on pipeline section with The length of liquid film contact, angle, θ refers to formed acute angle between pipeline and horizontal plane；X is the length that flows to of fluid, and dx is to flow to sky Between step-length；G is acceleration of gravity；ρ is density, and subscript (G L) represents gas phase or liquid phase.

According to one preferred embodiment of the present invention, the internal diameter of described Venturi tube is between 50-250mm；Throat and upstream tube The diameter ratio of road or downstream pipe is between 0.4-0.75；The angle of throat scope of contraction section is 16-25 °；The expansion of expansion segment Angle is between 7-15 °；The length range of throat is at 300-600mm.

The invention has the beneficial effects as follows: be different from the situation of prior art, the multiphase flow metering detection that the present invention provides is System, combines capacitance chromatography imaging (ECT) technology, Electrical Resistance Tomography (ERT) technology, ultrasonic detecting technology with venturi, Multiphase flow rates is solved by the combined signal utilizing each sensor；And be standardized module form by each sensor design, make Its position on venturi can change flexibly, accurately surveys the multiphase flow offer of different flow patterns by adjusting measurement position Amount；Having simple in construction, signal extraction is stable, response frequency advantages of higher.

Accompanying drawing explanation

For the technical scheme being illustrated more clearly that in the embodiment of the present invention, in embodiment being described below required for make Accompanying drawing be briefly described, it should be apparent that, below describe in accompanying drawing be only some embodiments of the present invention, for From the point of view of those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other according to these accompanying drawings Accompanying drawing.

Fig. 1 is the structural representation of multiphase flow metering detecting system one preferred embodiment of the present invention；And

Fig. 2 is the fundamental diagram of detecting system in Fig. 1 embodiment.

Detailed description of the invention

Below in conjunction with the accompanying drawings and embodiment, the present invention is described in further detail.Implement it is emphasized that following Example is merely to illustrate the present invention, but is not defined the scope of the present invention.Same, following example are only the portion of the present invention Point embodiment and not all embodiments, the institute that those of ordinary skill in the art are obtained under not making creative work premise There is other embodiments, broadly fall into the scope of protection of the invention.

Refer to the structural representation that Fig. 1, Fig. 1 are multiphase flow metering detecting system one preferred embodiments of the present invention, this inspection Examining system includes but not limited to that following structure forms: Venturi tube 100, pressure module (2,6,10,11), capacitance chromatography imaging mould Block (3,7,12), Electrical Resistance Tomography module (4,8,13), ultrasound detection module (5,9,14) and data acquisition and procession list Unit 20.

Specifically, Venturi tube 100 includes upstream 21, contraction section 1, throat 22, expansion segment 23 and downstream tube Road 24.Wherein, contraction section 1 is located between upstream 21 and throat 22, expansion segment 23 be located at throat 22 and downstream pipe 24 it Between.Connected by flange arrangement between upstream 21, contraction section 1, throat 22, expansion segment 23 and downstream pipe 24.

The internal diameter of Venturi tube is between 50-250mm；The diameter ratio of throat 22 and upstream 21 or downstream pipe 24 Between 0.4-0.75；The angle of throat scope of contraction section 1 is 16-25 °；The angle of flare of expansion segment 23 is between 7-15 °；Throat Length range is at 300-600mm.

The upstream of Venturi tube 100, throat and downstream are respectively arranged with pressure module, capacitance chromatography imaging module, electricity Resistance layer analysis image-forming module and ultrasound detection module.Preferably, this pressure module, capacitance chromatography imaging module, resistance chromatograph into As module and ultrasound detection module all use flange arrangement and the upstream 21 of Venturi tube, throat 22 and downstream pipe 24 connect.It should be noted that the upstream of Venturi tube 100, throat and downstream be respectively provided with pressure module, capacitance chromatographic Image-forming module, Electrical Resistance Tomography module and the arrangement form of ultrasound detection module and position relationship are not limited in figure institute Situation about showing, can reversing of position and distributing order according to demand.That is the ECT module 7, ERT of venturi throat 22 Module 8, sonac module 9 and pressure module (6,10) can be exchanged with each other position, in order to choose the most stable taking Pressure position and image space.Equally, at each module also interchanging positions of the upstream of venturi Yu downstream.

Between adjacent pressure module connect have differential pressure transmitter (16,17,18), in order to measure diverse location pressure module it Between pressure difference value.Data acquisition and procession unit 20 and pressure module (2,6,10,11), capacitance chromatography imaging module (3,7, 12), Electrical Resistance Tomography module (4,8,13), ultrasound detection module (5,9,14) and differential pressure transmitter (16,17,18) are electrically connected Connect, for gathering and process the data of each functional module.

Venturi throat 22 position is preferably provided with two pressure modules (6,10), and two pressure modules (6,10) it Between spacing not less than 200mm.Preferably, the pressure module 2 of upstream setting and the initiating terminal distance of contraction section 1 are more than 0.5D； The pressure module 11 of downstream setting and the end distance of expansion segment 23 are more than 6D, and wherein, D is upstream 21 or downstream pipe The interior diameter of 24.

It is further preferred that this detecting system also includes pressure transmitter 15 and temperature transmitter 19, this pressure transmitter 15 are specifically located in Venturi tube upstream 21, for detecting the force value of Venturi tube upstream position.Temperature transmitter 19 are specifically located on Venturi tube downstream pipe 24, for detecting the temperature value of Venturi tube downstream position.Pass through venturi Pressure and the temperature of fluid measured by the pressure transmitter 15 of pipe 100 upstream and the temperature transmitter 19 in Venturi tube 100 downstream, logical Cross the density of gas phase that this information can be calculated in multiphase flow.

Oil-gas-water multiphase flow is after the contraction section 1 of Venturi tube, and oil-water is biphase will form emulsifying under acceleration Liquid, causes multiphase flow to become the ring-type or vapor-liquid two phases flowing of slug type.In this case, the momentum differential side of vapor-liquid two phases Journey can be represented with (2) by formula (1).

$-{\mathrm{dp}}_G=\frac{W_G}{A_G}{\mathrm{dU}}_G+\frac{{\mathrm{\τ}}_{GW}{S}_{GW}}{A_G}dx-\frac{{\mathrm{\τ}}_i{S}_i}{A_G}dx+{\mathrm{g\ρ}}_{G}dx\·sin\mathrm{\θ}---\left(2\right)$

$-{\mathrm{dp}}_L=\frac{W_L}{A_L}{\mathrm{dU}}_L+\frac{{\mathrm{\τ}}_{LW}{S}_{LW}}{A_L}dx-\frac{{\mathrm{\τ}}_i{S}_i}{A_L}dx+{\mathrm{g\ρ}}_{L}dx\·sin\mathrm{\θ}---\left(2\right)$

Wherein, the pipeline pressure that density of gas phase is surveyed by pressure transmitter 15 calculates；Liquid phase is water and the mixture of oil, It is aqueous that its density can be passed through measured by ECT with ERT sensor (i.e. capacitance chromatography imaging module and Electrical Resistance Tomography module) Rate obtains with oil content.Due to reality measure on pipeline section only have unique static pressure measurement, therefore can by liquid phase with The static pressure of gas phase is considered as equal.Can obtain after now (1) (2) two formula being merged:

$-A\left(\frac{dp}{dx}\right)=W_G\frac{{\mathrm{dU}}_G}{dx}+W_L\frac{{\mathrm{dU}}_L}{dx}+{\mathrm{\τ}}_{GW}{S}_{GW}+{\mathrm{\τ}}_{LW}{S}_{LW}+(A_G{\mathrm{\ρ}}_G+A_L{\mathrm{\ρ}}_L)sin\mathrm{\θ}---\left(3\right)$

Wherein, W_GFor gas phase mass flow, A is gas phase circulation area, A_GIt is gas phase circulation area, A_LIt it is liquid phase circulating face Long-pending, U_GFor the true flow velocity of gas phase, τ_GWFor the shear stress between gas phase and tube wall, τ_iFor the shear stress between gas phase and liquid film, τ_LW It is the shear stress between liquid phase and tube wall, S_GWThe length contacted with tube wall for gas phase on pipeline section, S_LWIt is liquid phase and tube wall Contact length, S_iThe length contacted with liquid film for gas phase on pipeline section, angle, θ refers between pipeline and horizontal plane formed sharp Angle；X is the length that flows to of fluid, and dx is to flow to spatial mesh size；G is acceleration of gravity；P is density, and subscript (G L) represents gas phase Or liquid phase.

In above formula, except gas phase and liquid phase quality flow W_GWith W_LOutward, remaining parameter all can pass through ECT module (7,12), ERT module (8,13) and the measurement signal acquisition of ultrasonic module (9,14).It is used for describing throat 22 and expansion segment by above formula The pressure drop of 23, can get two about W_GWith W_LIndependent equation.Meanwhile, use differential pressure transmitter 17 to the throat's pressure after lengthening Fall measures, and obtains the fluid irrecoverable pressure drop in straight tube；Use differential pressure transmitter 18 to venturi expansion segment 23 Differential pressure measures.Solve equation group and can obtain the value of gas phase flow rate and liquid phase flow.

On this basis, the sensing module using throat is (capacitance chromatography imaging module 7, Electrical Resistance Tomography module 8, super Sound detection module 9) (capacitance chromatography imaging module 12, Electrical Resistance Tomography module 13, ultrasonic with the sensing module in venturi downstream Detection module 14) moisture content in liquid phase is detected, the discharge in liquid phase can be obtained thus obtain oil-gas-water three Phase flow rate.It is the fundamental diagram of detecting system in Fig. 1 embodiment that concrete calculation process refers to Fig. 2, Fig. 2.

Contraction section 1 at venturi is produced different pressure drops by different flow patterns.The present invention is right by differential pressure transmitter 16 Venturi contraction section 1 pressure drop measures the overall presure drop that available fluid produces in this part.Sensing by venturi upstream Device cluster (capacitance chromatography imaging module 3, Electrical Resistance Tomography module 4, ultrasound detection module 5) and the pressure of venturi contraction section 1 Multiphase flow can be flowed situation by fall measurement apparatus (differential pressure transmitter 16), accurately judges thus enters flow calculation model Row optimizes targetedly.

In this embodiment, capacitance chromatography imaging (ECT) technology, Electrical Resistance Tomography (ERT) technology are tied mutually with venturi Close, be aided with the ultrasonic detecting technology that can measure thickness of liquid film simultaneously and oil-gas-water multiphase flow rates is measured.The present invention can be led to Cross the electricity imaging sensor being arranged on venturi difference key position with sonac, local cross section to be distributed and liquid mutually Film thickness is identified, and these information can help to judge multiphase flow pressure drop producing cause in venturi.And then can be by multistage Differential pressure signal is set up solution of equations and is gone out the flow of oil-gas-water three-phase.It addition, also by each sensor design in this inventive embodiments For standardized module form so that it is the position on venturi can change flexibly, measure position to different flow patterns by adjusting Multiphase flow provides accurately to be measured.This detecting system has simple in construction, and signal extraction is stable, response frequency advantages of higher.

The foregoing is only the some embodiments of the present invention, not thereby limit the scope of the claims of the present invention, every profit The equivalent structure made by description of the invention and accompanying drawing content or equivalence flow process conversion, or directly or indirectly it is used in other phases The technical field closed, is the most in like manner included in the scope of patent protection of the present invention.

Claims (9)

1. a multiphase flow metering detecting system, it is characterised in that described system includes Venturi tube, pressure module, capacitor layers Analysis image-forming module, Electrical Resistance Tomography module, ultrasound detection module and data acquisition and procession unit；Described Venturi tube Upstream, throat and downstream are respectively arranged with described pressure module, described capacitance chromatography imaging module, described Electrical Resistance Tomography Module and described ultrasound detection module, connect between adjacent described pressure module and have differential pressure transmitter, in order to measure not coordination Put the pressure difference value between pressure module；Described data acquisition and procession unit becomes with described pressure module, described capacitance chromatographic As module, described Electrical Resistance Tomography module, described ultrasound detection module and the electrical connection of described differential pressure transmitter, it is used for gathering And process the data of each functional module.

Detecting system the most according to claim 1, it is characterised in that described detecting system also includes being located in Venturi tube The pressure transmitter of trip, described pressure transmitter is for detecting the force value of Venturi tube upstream position.

Detecting system the most according to claim 2, it is characterised in that detecting system also includes being located at Venturi tube downstream Temperature transmitter, described temperature transmitter is for detecting the temperature value of Venturi tube downstream position.

Detecting system the most according to claim 1, it is characterised in that the throat of described Venturi tube is provided with two pressure moulds Spacing between block, and two pressure modules is not less than 200mm.

Detecting system the most according to claim 1, it is characterised in that between upstream and the throat of described Venturi tube It is provided with contraction section, between throat and downstream pipe, is provided with expansion segment；Described upstream, described contraction section, described throat, described Connected by flange arrangement between expansion segment and described downstream pipe.

Detecting system the most according to claim 5, it is characterised in that the pressure module that upstream is arranged is initial with contraction section End distance is more than 0.5D；The end distance of pressure module and expansion segment that downstream is arranged is more than 6D, wherein, D be upstream or The interior diameter of person's downstream pipe.

Detecting system the most according to claim 5, it is characterised in that described pressure module, described capacitance chromatography imaging mould Block, described Electrical Resistance Tomography module and described ultrasound detection module all use the upstream of flange arrangement and described Venturi tube Pipeline, throat and downstream pipe connect.

Detecting system the most according to claim 1, it is characterised in that the parameter that each functional module is measured meets below equation Formula:Wherein, W_GFor gas phase quality Flow, A is gas phase circulation area, A_GIt is gas phase circulation area, A_LIt is liquid phase circulation area, U_GFor the true flow velocity of gas phase, τ_GWFor gas Shear stress mutually and between tube wall, τ_iFor the shear stress between gas phase and liquid film, τ_LWIt is the shear stress between liquid phase and tube wall, S_GW The length contacted with tube wall for gas phase on pipeline section, S_LWIt is the contact length of liquid phase and tube wall, S_iFor gas phase on pipeline section The length contacted with liquid film, angle, θ refers to formed acute angle between pipeline and horizontal plane；X is the length that flows to of fluid, and dx is to flow to Spatial mesh size；G is acceleration of gravity；ρ is density, and subscript (G L) represents gas phase or liquid phase.

Detecting system the most according to claim 5, it is characterised in that the internal diameter of described Venturi tube 50-250mm it Between；The diameter ratio of throat and upstream or downstream pipe is between 0.4-0.75；The angle of throat scope of contraction section is 16- 25°；The angle of flare of expansion segment is between 7-15 °；The length range of throat is at 300-600mm.