CN101333924B - Oil gas water flow measurement system - Google Patents
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- CN101333924B CN101333924B CN2008101125583A CN200810112558A CN101333924B CN 101333924 B CN101333924 B CN 101333924B CN 2008101125583 A CN2008101125583 A CN 2008101125583A CN 200810112558 A CN200810112558 A CN 200810112558A CN 101333924 B CN101333924 B CN 101333924B
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Abstract
The invention relates to an oil-gas-water flow measurement system which comprises an integrated three-phase flow meter, a metering separator used for the three-phase separation of oil, gas and water, an oil flow meter, a gas flow meter and a water flow meter for the separate metering of oil, gas and water after the separation. The integrated three-phase flow meter includes a main pipe, a venturi device which is arranged on the main pipe and used for measuring the flow of the fluids in the main pipe, a conductivity measuring sensor which is arranged in the main pipe and used for calculating the gas phase fraction of the small gas bubble, the gas phase fractions of oil, gas and water, and the flow rate of the gas and liquid, a capacitance measuring sensor which is arranged in the main pipe and used for calculating the gas phase fractions of the big and small bubbles, the gas phase fractions of oil, gas and water, and the flow rate of gas and liquid and a Gamma densimeter which is arranged in the main pipe and used for calculating the density of the fluids. The oil-gas-water flow measurement system has the advantages of accurately measuring the water content of the condensate oil of the high-pressure condensate gas well, realizing the online monitoring of the oil gas well and becoming more practical.
Description
Technical field
The present invention relates to a kind of Flow Measuring System of field of petroleum exploitation, particularly relate to a kind of oil-gas-water three phase flow quantity measuring system.
Background technology
At present, in the development process of high-pressure condensate gas field, there is the problem that water content in the condensate can't accurate-metering always.The condensate gas central treating station adopts the mode of gas-liquid separator, flow meter and analytical test to carry out oil-gas-water metering usually.Large (the 2000m of Tarim Basin high-pressure condensate gas gas well gas oil ratio
3More than/the t), large (the nearly 0.4t/m of profit density contrast
3) etc. characteristics, existing technological process is difficult to get representational oil mixing with water sample, can not grasp individual well moisture content and variation tendency, can't correctly carry out oil reservoir development dynamic analysis and development plan and adjust in good time, have a strong impact on the in time supporting of effect of reservoir development and oil gas treatment system.Simultaneously, because measurement of water-content coefficient is inaccurate, can't effectively take anticorrosive measure.
This shows, above-mentioned existing oil gas water flow measurement system obviously still has inconvenience and defective, and demands urgently further being improved in structure and use.The inventor is based on being engaged in for many years abundant practical experience and professional knowledge of this type of product design manufacturing, positive research and innovation in addition, to founding a kind of oil gas water flow measurement system of new structure, can improve general existing oil gas water flow measurement system, make it have more practicality.
Summary of the invention
Main purpose of the present invention is, overcome the defective that existing oil gas water flow measurement system exists, and provide a kind of new oil gas water flow measurement system, technical problem to be solved is can Measurement accuracy high-pressure condensate gas well condensate water content, realize the Oil/gas Well on-line monitoring, thereby more be suitable for practicality, and have the value on the industry.
The object of the invention to solve the technical problems realizes by the following technical solutions.According to a kind of oil gas water flow measurement system that the present invention proposes, be used for measuring the flow of individual well oil gas water, it comprises: three-phase does not separate flow meter, is used for real time measure oil gas water instantaneous delivery; Metering separator is connected in above-mentioned three-phase and does not separate flow meter, is used for oil gas water three phase is separated; And oil flowmeter, gas flowmeter and water ga(u)ge be connected to described metering separator, is used for the flow that separates rear oil, G﹠W is measured separately.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid oil gas water flow measurement system, wherein said three-phase does not separate flow meter and comprises: trunk line; Venturi is arranged on the trunk line, is used for measuring the flow of trunk line inner fluid; Conductivity measurement sensors is arranged in the trunk line, is used for calculating gas phase fraction, each phase phase fraction of oil gas water, gas and the flow rate of liquid of minute bubbles; Capacitance measuring sensor is arranged in the trunk line, is used for calculating gas phase fraction, each phase phase fraction of oil gas water, gas and the flow rate of liquid of large and small bubble; And the gamma densometer, be arranged in the trunk line, be used for the density of Fluid Computation.
Aforesaid oil gas water flow measurement system, wherein said conductivity measurement sensors comprises: emission electrode, exploring electrode, the working electrode group that is made of two small electrodes and the backup electrode group that is made of two small electrodes.
Aforesaid oil gas water flow measurement system, the spacing of two small electrodes of wherein said working electrode group is 65mm; The spacing of two small electrodes of described backup electrode group is 65mm.
Aforesaid oil gas water flow measurement system, wherein said capacitance measuring sensor comprises: excitation variable winding, the large electrode group that is made of two large electrodes and the 3rd small electrode group that is comprised of two small electrodes.
Aforesaid oil gas water flow measurement system, the spacing of two large electrodes of wherein said large electrode group is 165mm, two small electrode spacings of described the 3rd small electrode group are 65mm, and the 3rd small electrode group is arranged between two large electrodes of this large electrode group.
Aforesaid oil gas water flow measurement system, wherein said gamma densometer is made of emitter and receiving system two parts; This emitter is made of radioactive source, plumbous box, mechanical shutter and corrosion resistant plate; This receiving system is made of receiving crystal, photomultiplier and electronics amplifier unit.
Aforesaid oil gas water flow measurement system, wherein said receiving crystal are that sodium iodide adds thallium.
By technique scheme, oil gas water flow measurement system of the present invention has following advantages at least:
The oil gas water flow measurement system that the present invention proposes, online real time measure oil gas aquatic products amount, energy accurate-metering individual well moisture content and variation tendency, be conducive to monitor the Oil/gas Well condition of production, for the diagnosis of ill production status provides accurately data message, avoid the generation of the abnormal conditions such as water breakthrough, has channeling and serious obstruction, meet the requirement of oil field meticulous process.
This oil gas water flow measurement system is first successful Application three-phase flow meter metering of Chinese onshore oil gas field individual well oil gas aquatic products amount, has widened approach for the onshore oil gas field especially one-well metering in high-pressure condensate gas field, has indicated the developing direction of one-well metering.
Oil gas water flow measurement system of the present invention, owing to also have the oil gas water gaging equipment of three phase separation, thus can mutually verify the survey data of not separating flow meter, thus the accuracy of assurance survey data.
In sum, the oil gas water flow measurement system of special construction of the present invention, it has above-mentioned many advantages and practical value, and in like product, publish or use and really genus innovation there are no similar structure design, no matter it structurally or larger improvement all arranged on the function, have large improvement technically, and produced handy and practical effect, and more existing oil gas water flow measurement system has the multinomial effect of enhancement, thereby more be suitable for practicality, and have the extensive value of industry, really be a new and innovative, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of manual, below with preferred embodiment of the present invention and cooperate accompanying drawing to be described in detail as follows.
Description of drawings
Fig. 1 is the schematic flow sheet of oil gas water flow measurement system embodiment of the present invention.
Fig. 2 is the structural representation that three-phase does not separate flow meter.
Fig. 3 is the structural representation of described capacitance measuring sensor.
Fig. 4 is the structural representation of conductivity measurement sensors.
Fig. 5 is the composition structural representation of on-the-spot secondary meter.
The specific embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, its specific embodiment of oil gas water flow measurement system, structure, feature and effect thereof to foundation the present invention proposes are described in detail as follows.
Seeing also shown in Figure 1ly, is the schematic flow sheet of oil gas water flow measurement system embodiment of the present invention.This oil gas water flow measurement system, for the flow of measuring individual well oil gas water, it comprises: three-phase does not separate flow meter 100, metering separator 200, gas flowmeter FT2201, oil flowmeter FT2202 and water ga(u)ge FT2203.The entrance that described three-phase does not separate flow meter 100 is connected in individual well oil gas aqueous mixtures pipeline, is used for the flow of Real-time Measuring gauging air-water mixture Oil, Water, Gas.
Seeing also shown in Figure 2ly, is the structural representation that three-phase does not separate flow meter.This three-phase does not separate flow meter 100 and comprises: supply the mobile trunk line 110 of mixture of oil, water and gas material, and be arranged on gamma density meter 120, capacitance measuring sensor 130, conductivity measurement sensors 140 and Venturi 150 on the trunk line 110.The principle that this three-phase does not separate the measurement mixture of oil, water and gas of flow meter is that individual well comes the oil gas aqueous mixtures to be assumed to be four phase fluids, i.e. oil, water, discrete gas and free gas.Air pocket flow velocity identical with gas flow rate (air pocket is discrete gas), minute bubbles flow velocity identical with flow rate of liquid (minute bubbles are free gas) is vertically measured the interior oil phase flow velocity of pipeline section identical with aqueous phase flow rate.
If: Q: volume flow dose rate, A: volume phase fraction, v: flow velocity
Q＝A×V?(1)
The volume phase fraction equals the product of phase fraction and measuring tube cross-sectional area, because the measuring tube cross-sectional area is known, the calculating of each phase flow rate rate of oil gas water can be exchanged into phase fraction and each mutually calculating of flow velocity.
Described gamma densometer 120 is used for computational fluid mixing density, it is made of emitter and receiving system two parts, emitter mainly is made of parts such as radioactive source, plumbous box, mechanical shutter and corrosion resistant plates, and receiving system mainly contains receiving crystal (sodium iodide adds thallium), photomultiplier and electronics amplifier unit and consists of.The gamma-rays bump receiving crystal that radioactive source produces, can produce 1 electronics after each gamma-rays particle hits, electronics obtains energy through the high voltage electric field of photomultiplier, accelerated motion, finally caught by the electronics amplifier unit, and with the electron amount of electric impulse signal by receiving under the counter records.During normal operation, gamma-rays enters in the pipeline by shutter, owing in the pipeline Fluid Flow in A is arranged, and oil gas water meeting absorption portion gamma-rays, but the degree that absorbs is different, and receiving system can be measured and receive gamma-ray quantity in the unit interval this moment.Utilize empirical formula, calculate the hybrid density of fluid.
Seeing also shown in Figure 3ly, is the structural representation of described capacitance measuring sensor 130.This capacitance measuring sensor 130 is used for measuring gas phase fraction, each phase phase fraction of oil gas water, gas and the flow rate of liquid of the large and small bubble that hangs down aqueous fluid.This capacitance measuring sensor 130 comprises and setting gradually along the mixture flow direction: first electrode, the first small electrode, excitation variable winding 131, the second small electrode and second largest electrode; Wherein, first electrode and second largest electrode formation large electrode group 132, the first small electrodes and the second small electrode consist of the 3rd small electrode group 133.The spacing of two large electrodes of this large electrode group 132 is 165mm, two small electrode spacings of described the 3rd small electrode group 133 are 65mm, and the 3rd small electrode group 133 is arranged between two large electrodes of this large electrode group, and excitation variable winding 131 is between the first small electrode and the second small electrode.These excitation variable winding 131 excitation voltage signals, signal is successively by the 3rd small electrode group 133 and large electrode group 132, the signal of telecommunication that the 3rd small electrode group 133 record minute bubbles cause, the signal of telecommunication that large electrode group 132 record air pockets cause, voltage signal be measured and record in addition during through each electrode.According to the functional relation of voltage and dielectric constant, can draw out the time dependent curve of dielectric constant, this curve of integration can be calculated the average phase fraction of size bubble preset time.
Calculate each phase phase fraction of oil gas water
Capacitivity equation: ε
Mixture=f (α ε
Gas, β ε
Water, γ ε
Oil) (2-1)
Density equation: ρ
Mixture=f (α ρ
Gas, β ρ
Water, γ ρ
Oil) (3)
Normalizing equation: alpha+beta+γ=1 (4)
In the formula:
ε
Mixture: mixture capacitivity (can be calculated by magnitude of voltage)
ε
Gas: gas phase capacitivity (known)
ε
Water: water capacitivity (known)
ε
Oil: oil phase capacitivity (known)
ρ
Mixture: mixture density (gamma densimeter measurement value can be calculated)
ρ
Gas: density of gas phase (known)
ρ
Water: water density (known)
ρ
Oil: oil phase density (known)
α: gas phase phase fraction (the unknown)
β: water phase fraction (the unknown)
γ: oil phase phase fraction (the unknown)
Three unknown numbers of three equations, simultaneous solution can obtain gas phase phase fraction, water phase fraction and oil phase phase fraction.
Calculation of Gas and flow rate of liquid
Seeing also shown in Figure 4ly, is the structural representation of conductivity measurement sensors.This conductivity measurement sensors 140 is arranged in the trunk line 110, is used for calculating gas phase fraction, each phase phase fraction of oil gas water, gas and the flow rate of liquid of minute bubbles.This conductivity measurement sensors 140 comprises and setting gradually along the mixture flow direction: emission electrode 141, the backup electrode group 142 that is made of two small electrodes, the working electrode group 143 and the exploring electrode 144 that are made of two small electrodes.The spacing of two small electrodes of described working electrode group 143 is 65mm; The spacing of two small electrodes of described backup electrode group 142 is 65mm.Emission electrode 141 emitting voltage signals, signal moves from bottom to up with fluid, passes through successively backup electrode group 142, working electrode group 143 and exploring electrode 144.Measured and the record in addition of voltage signal during through two electrode groups.According to the functional relation of voltage and dielectric constant, can draw out the time dependent curve of dielectric constant, this curve of integration can be calculated the average phase fraction of minute bubbles preset time.
Calculate each phase phase fraction of oil gas water
Conductivity equation: σ
Mixture=f (α σ
Gas, β σ
Water, γ σ
Oil) (2-2)
Density equation: ρ
Mixture=f (α ρ
Gas, β ρ
Water, γ ρ
Oil) (3)
Normalizing equation: alpha+beta+γ=1 (4)
In the formula:
σ
Mixture: conductivity of mixture (can be calculated by magnitude of voltage)
σ
Gas: gas phase electrical conductivity (known)
σ
Water: water electrical conductivity (known)
σ
Oil: oil phase electrical conductivity (known)
ρ
Mixture: mixture density (gamma densimeter measurement value can be calculated)
ρ
Gas: density of gas phase (known)
ρ
Water: water density (known)
ρ
Oil: oil phase density (known)
α: gas phase phase fraction (the unknown)
β: water phase fraction (the unknown)
γ: oil phase phase fraction (the unknown)
Three unknown numbers of three equations, simultaneous solution can obtain gas phase phase fraction, water phase fraction and oil phase phase fraction.
Calculation of Gas and flow rate of liquid
Emission electrode emitting voltage signal, the measured and record in addition of voltage signal when the small electrode.After a period of time, two time dependent curves of some voltages of each self-forming of small electrode of working electrode group are done computing cross-correlation to these curves, if when drawing maximum, what can think two small electrodes measurements is same fluid.Time T corresponding to this point of maximum occur and think that namely same logistics moves to rear required time of an electrode, at this moment V from last electrode
Gas(V
Liquid)=d/T=0.065/T.(d is the distance between the small electrode, known d=0.065m).
The conversion of capacitance measuring sensor and conductance measurement sensor
Conductivity measurement sensors has an exploring electrode, the signal of telecommunication that the continual measurement of this electrode receives, and it is converted into electrical conductivity, (electrical conductivity of vacant duct is 1 when electrical conductivity reaches 30 left and right sides, oil-overflow pipeline electrical conductivity is 2～2.3, and water-filled pipeline electrical conductivity is saturation value 〉=35), (moisture is 65%～75%), capacitance measuring sensor quits work, and conductivity measurement sensors is started working.
Described Venturi 150 is used for measuring liquid phase flow rate.This Venturi becomes the fluid pressure difference of certain relation to measure fluid flow by measuring with flow, utilizes the pressure that produces before and after the fluid throttling to change to measure.
In the formula:
M: liquid quality flow
E: penalty coefficient (
)
C: discharge coefficient (c=f (Re
D, β)
Re
D: Reynolds number
β: Venturi tube trunnion internal diameter/Venturi tube internal diameter
γ: level pressure thermal capacitance/constant volume thermal capacitance
ε: sampling factor (ε=f (dP/P, beta, gamma)
ρ: fluid density
A: Wen's trunnion passes through area
DP: fluid is by differential pressure before and after the Venturi tube
When capacitance measuring sensor or conductivity measurement sensors cross-correlation calculation flow velocity, when the cross-correlation success rate is on the low side (being that the cross-correlation calculation success rate is lower than minimum permissible value), the liquid phase flow rate that the venturi of winning the confidence calculates.
Oil gas water gaging of the present invention system comprises that also on-the-spot secondary meter 160 is connected in three-phase and does not separate flow meter 100, see also shown in Figure 5ly, on-the-spot secondary meter 160 mainly is comprised of flow computer 161, power module 162, safety barrier 163, densometer interface card 164 and wiring terminal 165 etc.Described flow computer 161 is comprised of communication module and computing module.The signal that communication module collects capacitance sensor and conductivity sensor, and the data importing flow computer of densometer interface card output, with result of calculation (oil gas water flow, temperature, pressure and differential pressure) with the data wire teletransmission to Industrial Personal Computer (IPC).Computing module is responsible for calculating oil gas water instantaneous delivery.Described power module is responsible for the 24V direct current of access is distributed, and is transmitter (pressure transmitter, differential pressure transmitter and temperature transmitter), capacitance sensor, conductivity sensor, gamma densometer and flow computer power supply.Described safety barrier is the associate device of inbeing safe explosion prevention instrument and meter, does not affect under normal circumstances the function of measuring system.It is arranged on a side of harbor, and when the intrinsic safe explosion-proof system broke down, the energy (electric energy) that can will scurry into the hazardous area was limited in the safety value, thereby guarantees produced on-site safety.Described densometer interface card is collected the signal that the gamma densometer gathers, and draws the instantaneous hybrid density of fluid by computing, with result of calculation input flow rate computer.The data remote of flow computer output is to the Central Control Room Industrial Personal Computer (IPC), and Industrial Personal Computer (IPC) is used flow indication software after receiving data, realizes the functions such as the instantaneous demonstration of oil gas water flow, oil well measurement and meter calibration.
See also shown in Figure 1ly, after three-phase does not separate flow meter 100, be connected in metering separator 200 by pipeline.This metering separator comprises a tank body, thereby be provided with baffle plate 212 and baffle plate 223 in the inside of tank body tank interior is divided into three chambeies: oil mixing with water chamber 210, oil pocket 220 and water cavity 230.The principle that these metering separator 200 application of weight are separated is opened oil and gas and water.Mixture of oil, water and gas enters eliminator by the gas-liquid Gravity Separation, and gas phase, is discharged by gaseous phase outlet except behind the liquid through corrugated sheet and mist eliminator, and at gaseous phase outlet gas flowmeter FT2201 is installed.Liquid phase water-oil separating under Action of Gravity Field, oil spill flow to into oil pocket 220, and water enters water cavity 230 by water communicating pipe 240.Be provided with the oil phase outlet in oil pocket 220 bottoms, and be provided with oil flowmeter FT2202 in this outlet, be used for measuring the flow of oil.Be provided with the water outlet in the bottom of water cavity, and be provided with water ga(u)ge FT2203 in this outlet, be used for measuring the flow of water.
Oil mixing with water chamber and water cavity are communicated with, and according to U-shaped law of connected vessels, design formulas is as follows:
ρ
0h
0＝ρ
0h
1+ρ
1(h
2-h
1)
Wherein: ρ
0: sewage density h
0: water cavity water layer height
ρ
1: oil density
h
1: oil mixing with water chamber water layer height
h
2-h
1: oil mixing with water chamber oil reservoir height
Suppose h
2-h
1=0, because h
2=1.5m ρ
0=1120kg/m
3ρ
1=720kg/m
3Solving equation 1 can get h
0=1.5m
h
2-h
1=0, all be water in the oil mixing with water chamber namely, the height of water cavity water layer liquid level is 1.5m.But the highest operation liquid level of water is 1.22m, less than 1.5m.Therefore, during the eliminator normal operating, the oil reservoir liquid level in oil mixing with water chamber can not be 0, and namely the water in the oil mixing with water chamber can not overflow to oil pocket.
The water cavity height of baffle plate is 1.8m, and the highest operation liquid level of oil pocket is 1.02m.Therefore, during the eliminator normal operating, the oil in the oil pocket can not overflow across the water cavity baffle plate and enter water cavity.
Water cavity
ρ
0h
0＝ρ
0h
1+ρ
1(h
2-h
1)
Suppose h
1=0, because h
2=1.5m ρ
0=1120kg/m
3ρ
1=720kg/m
3Solving equation 1 can get h
0=0.965m
h
1=0, namely all be oil in the oil mixing with water chamber, the height of water cavity water layer liquid level should be 0.965m.Because water minimum operation liquid level is 0.98m, greater than 0.965m.Therefore, during the eliminator normal operating, the water layer liquid level in oil mixing with water chamber can not be 0, and namely the oil in the oil mixing with water chamber can not flow to water cavity from water communicating pipe.
The water cavity height of baffle plate is 1.8m, and the highest operation liquid level of water cavity is 1.22m.Therefore, during the eliminator normal operating, the water in the water cavity can not overflow across the water cavity baffle plate and enter oil pocket.
The technology contents that the application does not describe in detail all can find corresponding scheme in the prior art, therefore do not repeat them here.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, although the present invention discloses as above with preferred embodiment, yet be not to limit the present invention, any those skilled in the art, within not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, any simple modification that foundation technical spirit of the present invention is done above embodiment, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (6)
1. oil gas water flow measurement system is used for measuring the flow of individual well oil gas water, it is characterized in that it comprises:
Three-phase does not separate flow meter, is used for real time measure oil gas water instantaneous delivery, and it comprises:
Trunk line is for delivery of measured oil gas aqueous mixtures;
Venturi is arranged on the trunk line, is used for measuring the flow of trunk line inner fluid;
Conductivity measurement sensors is arranged in the trunk line, is used for measuring gas phase fraction, each phase phase fraction of oil gas water, gas and the flow rate of liquid of minute bubbles, measures each phase phase fraction of oil gas water by following formula 1 to formula 3:
Formula 1: σ mixture=f (α σ gas, β σ water, γ σ oil);
Formula 2: ρ mixture=f (α ρ gas, β ρ water, γ ρ oil);
Formula 3: alpha+beta+γ=1;
In the formula: σ mixture: conductivity of mixture, σ gas: gas phase electrical conductivity, σ water: water electrical conductivity, σ oil: oil phase electrical conductivity, ρ mixture: mixture density, ρ gas: density of gas phase, ρ water: water density, ρ oil: oil phase density, α: gas phase phase fraction, β: water phase fraction, γ: oil phase phase fraction;
Capacitance measuring sensor is arranged in the trunk line, is used for measuring gas phase fraction, each phase phase fraction of oil gas water, gas and the flow rate of liquid of air pocket, minute bubbles; Described air pocket is discrete gas, and its flow velocity is identical with gas flow rate; Described minute bubbles are free gas, and its flow velocity is identical with flow rate of liquid; And
The gamma densometer is arranged in the trunk line, is used for measuring the density of mixture;
The backup electrode group that described conductivity measurement sensors comprises the emission electrode that sets gradually along the mixture flow direction, be made of two small electrodes, the working electrode group and the exploring electrode that are consisted of by two small electrodes, the signal of telecommunication that the continual measurement of this exploring electrode receives, and it is converted into electrical conductivity, when electrical conductivity reaches 30 left and right sides, capacitance measuring sensor quits work, and conductivity measurement sensors is started working;
Metering separator is connected in above-mentioned three-phase and does not separate flow meter, is used for oil gas water three phase is separated; And
Oil flowmeter, gas flowmeter and water ga(u)ge are connected to described metering separator, are used for the flow that separates rear oil, G﹠W is measured separately.
2. oil gas water flow measurement system according to claim 1, the spacing that it is characterized in that two small electrodes of wherein said working electrode group is 65mm; The spacing of two small electrodes of described backup electrode group is 65mm.
3. oil gas water flow measurement system according to claim 1 is characterized in that wherein said capacitance measuring sensor comprises: excitation variable winding, the large electrode group that is made of two large electrodes and the 3rd small electrode group that is comprised of two small electrodes.
4. oil gas water flow measurement system according to claim 3, the spacing that it is characterized in that two large electrodes of wherein said large electrode group is 165mm, two small electrode spacings of described the 3rd small electrode group are 65mm, and the 3rd small electrode group is arranged between two large electrodes of this large electrode group.
5. oil gas water flow measurement system according to claim 1 is characterized in that wherein said gamma densometer is made of emitter and receiving system two parts; This emitter is made of radioactive source, plumbous box, mechanical shutter and corrosion resistant plate; This receiving system is made of receiving crystal, photomultiplier and electronics amplifier unit.
6. oil gas water flow measurement system according to claim 5 is characterized in that wherein said receiving crystal is that sodium iodide adds thallium.
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