CN111289579A - Integrated sensor based on land surface gas-liquid separation and water holding rate correction method - Google Patents
Integrated sensor based on land surface gas-liquid separation and water holding rate correction method Download PDFInfo
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Abstract
The invention provides a land-based gas-liquid separation integrated sensor and a water holding capacity correction method, wherein the integrated sensor comprises a coaxially arranged electric conduction type sensor module, a capacitance sensor module and an array optical fiber sensor module; the capacitance sensor module is respectively provided with a metal shell, an outer insulating cylinder, a metal layer and an inner insulating cylinder from outside to inside; an insulating rod is arranged in the center of the capacitive sensor module, the conductive sensor module is positioned at one end of the insulating rod, and the conductive sensor module comprises six electrode rings; the array optical fiber sensor module is fixed at the other end of the insulating rod and comprises array optical fiber probes, measuring points of all the optical fiber probes are located on the same cross section, and the cross section is the radial cross section of the capacitance sensor module. The technical scheme of the invention solves the technical problems of incomplete gas phase separation, large error and the like in the existing land surface gas-liquid separation water holdup monitoring mode.
Description
Technical Field
The invention relates to the technical field of oil well monitoring, in particular to a land-based gas-liquid separation integrated sensor and a water holdup correction method.
Background
In the field of multiphase flow, the methods for monitoring land oil field parameters are mainly divided into three types, including two-phase separation three-component measurement, three-phase separation measurement and non-separation measurement. Because the oil field metering operation areas in China are far apart, oil wells in the oil field are scattered and disordered in field distribution, and the number and the scale are large. The three-phase separation measurement is complicated due to the large volume and the complex operation; although the non-separation measurement mode has the characteristics of small volume and light weight, the technical cost is extremely high, so that the non-separation measurement mode is not suitable for large-scale popularization of domestic oil well monitoring. Compared with the three-component measurement and the non-separation measurement, the gas-liquid separation type component monitoring technology is a main monitoring means of the current land surface oil field parameter monitoring mode due to the excellent characteristics of simple technical principle, relatively small volume, low cost and the like.
The electrical method is widely applied to the field of oil-water two-phase flow monitoring due to simple structure, low manufacturing cost and high response speed. The electrical method mainly comprises an electric conduction method and a capacitance method, and the capacitance and electric conduction sensing technology has better application in the measurement of the phase content of oil-water two-phase flow due to the obvious difference of the electric conductivity and the dielectric property of the oil-water two-phase. The optical fiber probe technology is widely applied to monitoring the gas holding rate of gas-liquid two-phase flow due to the characteristic that the optical fiber probe technology is sensitive to gas phase only. However, the optical fiber probe technology has the limitations of single parameter measurement, low interface coverage rate and the like, and although the method for monitoring the conductivity-capacitance phase content of the land surface oil well is widely applied to parameter monitoring in the field of oil-water two-phase flow, the method ignores the influence of free gas in oil-water two-phase flow fluid on monitoring accuracy, and errors occur in the measurement accuracy.
Therefore, in order to meet the actual requirements of oil field production, a new device and a new method which can accurately monitor and correct the phase content in the petroleum production logging are urgently needed to be researched.
Disclosure of Invention
According to the technical problems that gas phase separation is incomplete, errors are large and the like in the land gas-liquid separation water holdup monitoring mode, the land gas-liquid separation integrated sensor and the water holdup correction method are provided. The invention can realize accurate real-time water holdup measurement under the condition of incomplete gas-liquid separation in the land gas-liquid separation type water holdup monitoring technology.
The technical means adopted by the invention are as follows:
the invention provides a land-based gas-liquid separation integrated sensor which is characterized by comprising a conductive sensor module, a capacitance sensor module and an array optical fiber sensor module which are coaxially arranged;
the capacitance sensor module is respectively provided with a metal shell, an outer insulating cylinder, a metal layer and an inner insulating cylinder from outside to inside;
an insulating rod is arranged in the center of the capacitive sensor module, the conductive sensor module is positioned at one end of the insulating rod, and the conductive sensor module comprises six electrode rings;
the array optical fiber sensor module is fixed at the other end of the insulating rod and comprises an array optical fiber probe which is positioned in a gap between the insulating rod and the inner insulating cylinder, the array optical fiber probe comprises a plurality of optical fiber probes, measuring points of all the optical fiber probes are positioned on the same cross section, and the cross section is a radial cross section of the capacitance sensor module;
a gap between the insulating rod and the inner insulating cylinder is divided into n layers of annular spaces, the cross section is divided into m fan-shaped areas with a central angle of 360/m by taking the center of the cross section as a base point, measuring points of the optical fiber probes are all positioned on a separation line of the fan-shaped areas, m/2 measuring points of the optical fiber probes are arranged in each layer of annular space, an included angle formed by the measuring points of two adjacent optical fiber probes in the same layer of annular space and the center of the cross section is 180/m, and the total number of the measuring points of the optical fiber probes in two adjacent layers of annular spaces is m; the total number of the optical fiber probes is (m/2) multiplied by n; wherein N is more than or equal to 1, N belongs to N*；m≥1,m∈N*。
The invention also provides a low-air-volume oil-water retention rate correction method based on land gas-liquid separation, which adopts the integrated sensor and comprises the following processes:
the capacitance sensor module is adopted to measure the water holding capacity of the oil-water two-phase flow containing trace gas phase after gas-liquid separation treatment, and the capacitance water holding capacity h is obtained according to capacitance signalsc；
Adopting the conductive sensor module to monitor the oil-water two-phase flow containing trace gas phase after gas-liquid separation treatment, and obtaining the conductive water holding rate h according to the conductive signaliAnd a flow rate f;
the array optical fiber sensor module is adopted to feed oil-water two-phase flow containing trace gas phase after gas-liquid separation treatmentMonitoring, and acquiring the gas holdup h of the cross section by adopting an image processing methodgAn estimated value;
the water holding capacity h of the capacitorcAnd the water holding rate h of electric conductioniAs an information source, acquiring fusion water holdup h through data fusionm；
Will fuse the water holdup hmAnd section gas holdup hgAs characteristic parameters, a water holding rate correction model is constructed
hwIndicating the corrected water retention.
Further, the array type optical fiber sensor module adopts the method of obtaining the section gas holdup hgThe method for estimating the value specifically comprises the following steps:
step S1: a gap between the insulating rod and the inner insulating cylinder is divided into n layers of annular spaces;
step S2: interpolating and increasing the number of the measurement points of the optical fiber probe in each layer of annular space to m, wherein the measurement points with increased interpolation are interpolation points;
step S3: virtual data estimation is carried out on the interpolation points by adopting a multi-neighbor interpolation method, the virtual data estimation is carried out according to the weighting of the neighbor points, the number of the neighbor points is set to be m, and the rule of selecting the neighbor points is as follows: the actual measurement point which is close to the interpolation point and has the nearest distance is positioned at the adjacent layer of the annular space where the interpolation point is positioned, and only one adjacent point is selected in each layer of annular space; the multi-neighbor interpolation rule of the interpolation point is Zi＝α1Z1+α2Z2+α3Z3+α4Z4Wherein Zi, Z1, Z2, Z3 and Z4 represent voltage signals of actual measurement points respectively, and weight α1,α2,α3,α4Selecting according to the flow f obtained by the conductance sensor module;
step S4: imaging the response signals of the actual measurement point and the interpolation point;
step S5: and carrying out region identification on the imaged gas phase distribution graph to obtain section gas holdup estimation information.
Compared with the prior art, the invention has the following advantages:
the invention provides a land-based gas-liquid separation integrated sensor and a water holdup correction method, wherein the integrated sensor comprises a capacitance monitoring module, a conductance monitoring module and an optical fiber monitoring module, and is in a coaxial cylindrical shape as a whole; establishing a water holdup correction model according to the fusion water holdup characteristic, the flow characteristic and the gas holdup characteristic by using the water holdup correction method; the defects of incomplete gas phase separation, large error and the like in a land gas-liquid separation water holdup monitoring mode are overcome.
In conclusion, the technical scheme of the invention can realize accurate real-time water holdup measurement under the condition of incomplete gas-liquid separation in the land gas-liquid separation type water holdup monitoring technology. Therefore, the technical scheme of the invention solves the problems of incomplete gas phase separation, large error and the like in the existing land gas-liquid separation water holdup monitoring mode.
Based on the reasons, the invention can be widely popularized in the fields of oil well monitoring and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of an integrated sensor according to the present invention.
Fig. 2 is a schematic cross-sectional view of an integrated sensor according to the present invention.
Fig. 3 is a schematic cross-sectional view of an integrated sensor according to the present invention.
FIG. 4 is a schematic diagram of a gas-liquid separation based integrated sensor circuitry module according to the present invention.
FIG. 5 is a land-based gas-liquid separation type water holdup measuring system according to the present invention.
FIG. 6 is a flow chart of the water holdup correction method of the present invention.
FIG. 7 is a flow chart of the cross-sectional air-holding rate monitoring of the array type optical fiber probe according to the present invention.
In the figure: 1. a wellhead piping; 2. a first electromagnetic valve; 3. a second electromagnetic valve; 4. a third electromagnetic valve; 5. an inlet duct; 6. a gas-liquid separation tank; 7. an exhaust apparatus; 8. an integrated sensor; 9. an outlet conduit; 10. an inner insulating layer; 11. a metal layer; 12. an outer insulating layer; 13. a metal housing; 14. a downstream fixed support; 15. an array fiber sensor module; 16. a conductive sensor module; 17. an upstream fixed support; 18. an insulating rod; 161. energizing the E2 electrode ring; 162. measuring the M4 electrode ring; 163. measuring the M3 electrode ring; 164. measuring the M2 electrode ring; 165. measuring the M1 electrode ring; 166. the E1 electrode ring is energized.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1-3, the present invention provides an integrated sensor based on land gas-liquid separation, which can realize accurate real-time water-holding rate measurement under the condition of incomplete gas-liquid separation in the land gas-liquid separation type water-holding rate monitoring technology, and comprises a coaxially arranged conductive sensor module 16, a capacitive sensor module and an array optical fiber sensor module 15;
the capacitance sensor module 16 is composed of a metal shell 13, an outer insulating layer 12, a metal layer 11 and an inner insulating layer 10 from outside to inside;
an insulating rod 18 is arranged at the center of the capacitance sensor module, the conductive sensor module 16 is positioned at one end of the insulating rod 18, and the conductive sensor module 16 comprises six electrode rings;
the array optical fiber sensor module 15 is fixed at the other end of the insulating rod 18, the array optical fiber sensor module 15 comprises an array optical fiber probe, the array optical fiber probe is located in a gap between the insulating rod 18 and the inner insulating layer 10, the array optical fiber probe comprises a plurality of optical fiber probes, measuring points of all the optical fiber probes are located on the same cross section, and the cross section is a radial cross section of the capacitive sensor module;
a gap between the insulating rod 18 and the inner insulating cylinder 10 is divided into n layers of annular spaces, the cross section is divided into m fan-shaped areas with a central angle of 360/m by taking the center of the cross section as a base point, measuring points of the optical fiber probes are all positioned on a separation line of the fan-shaped areas, m/2 measuring points of the optical fiber probes are arranged in each layer of annular space, an included angle formed by the measuring points of two adjacent optical fiber probes in the same layer of annular space and the center of the cross section is 180/m, and the total number of the measuring points of the optical fiber probes in two adjacent layers of annular spaces is m; the total number of the optical fiber probes is (m/2) multiplied by n; wherein N is more than or equal to 1, N belongs to N*；m≥1,m∈N*。
Further, the insulation rod is fixed to the inner insulation layer 10 through a downstream fixing bracket 14 and an upstream fixing bracket 17, and the insulation rod 18, the downstream fixing bracket 14 and the upstream fixing bracket 17 are made of insulating corrosion-resistant materials.
Further, the conductivity sensor module 16 includes an excitation E2 electrode ring 161, a measurement M4 electrode ring 162, a measurement M3 electrode ring 163, a measurement M2 electrode ring 164, a measurement M1 electrode ring 165, and an excitation E1 electrode ring 166.
Further, the outer wall of the insulating rod 18 has six recessed annular grooves arranged at equal intervals, and the six electrode rings of the conductive sensor module 16 are respectively embedded in the annular grooves.
Further, in operation, the metal layer 11 is connected to a capacitive excitation source, and the metal housing 13 is connected to ground.
Preferably, in this embodiment, the gap between the insulating rod 18 and the inner insulating cylinder 10 is divided into 4 layers of annular spaces, the cross section is divided into 8 fan-shaped regions with a central angle of 45 ° by using the center of the cross section as a base point, the measuring points of the optical fiber probes are all located on a partition line of the fan-shaped regions, and there are 4 measuring points of the optical fiber probes in each layer of annular space, in the same layer of annular space, an included angle formed by the measuring points of two adjacent optical fiber probes in the same layer of annular space and the center of the cross section is 90 °, and the total number of the measuring points of the optical fiber probes in two adjacent layers of annular spaces is 8; the total number of the optical fiber probes is (m/2) multiplied by n; wherein N is more than or equal to 1, N belongs to N*；m≥1,m∈N*。
Fig. 4 is a schematic diagram of an operating circuit of the integrated sensor based on land gas-liquid separation, the electrically conductive sensor module 16 includes an electrically conductive sensor circuit subsystem, the capacitive sensor module includes a capacitive sensor circuit subsystem, and the array optical fiber sensor module 15 includes an array optical fiber detection sensor circuit subsystem; the integrated sensor further comprises a power module and a main control module.
The conductivity type sensor module 16 has two working modes, namely a conductivity-related flow monitoring sensor and a conductivity water holding rate monitoring sensor, the working state of the conductivity type sensor module 16 is controlled by the main control module, and the two working modes can not be carried out simultaneously;
the conductance-related flow monitoring sensor includes:
the conductance related excitation module is used for exciting an E2 electrode ring 161 and an E1 electrode ring 166, providing constant-amplitude alternating current for the conductance related flow monitoring circuit module, and establishing a current field in a pipeline;
a downstream detection electrode consisting of a measurement M3 electrode ring 163 and a measurement M4 electrode ring 162;
and, an upstream sense electrode consisting of a measure M1 electrode ring 165 and a measure M2 electrode ring 164;
the upstream detection electrode and the downstream detection electrode are respectively connected to an upstream signal processing circuit and a downstream signal processing circuit, and the upstream signal processing circuit and the downstream signal processing circuit respectively comprise a reverse filtering amplification circuit module, an in-phase amplification circuit module and an amplitude limiting circuit module; when the oil-water two-phase fluid flows through the integrated sensor, the random change of the fluid impedance generates random modulation action on the alternating constant current acting on the upstream detection electrode and the downstream detection electrode, the output of the upstream detection electrode and the output of the downstream detection electrode generate corresponding change along with the modulation action, corresponding amplification, detection, filtering and other operations are respectively carried out by the upstream signal processing circuit and the downstream signal processing circuit, and fluid flowing noise signals x (t) and y (t) are demodulated out and are used for calculating the flow f;
the electric conductivity water holdup monitoring sensor comprises:
the conductance excitation module generates a 20KHz excitation constant current source by using a waveform generator and is used for exciting the E2 electrode ring 161 and the E1 electrode ring 166;
and the conductance signal processing module comprises a signal conditioning circuit, a voltage-frequency conversion circuit and a signal shaping circuit, and is used for conditioning, voltage-frequency converting, pulse width modulating and the like the voltage signals of the measuring M3 electrode ring 163 and the measuring M2 electrode ring 164 and outputting frequency signals reflecting water holdup information.
The capacitance sensor circuit subsystem comprises a capacitance excitation module and a capacitance signal processing module, the capacitance excitation module is used for exciting the capacitance sensor module by an excitation source generated by the oscillation circuit, and the capacitance signal processing module is used for processing signals of the capacitance sensor module; the capacitance excitation module measures the capacitance of the capacitance sensor on one hand, and directly outputs a frequency signal capable of reflecting the capacitance of the capacitance sensor on the other hand, the capacitance signal processing module only performs signal shaping and filtering, no voltage signal exists in the whole measurement process of the capacitance sensor, and the excitation module directly outputs the frequency signal, so that the capacitance signal processed by the main controller module is also the frequency signal, and the frequency reflects the capacitance of the capacitance sensor.
The array type optical fiber detection sensor circuit subsystem comprises a light emitting module, a light receiving module and a signal processing module, wherein the light emitting module is used for providing driving electric energy for an infrared light source so as to enable the infrared light source to emit light; the light receiving module is used for converting the returned light energy into electric energy for the detector; the signal processing module performs operations such as difference, power amplification, analog-to-digital conversion and the like on the received electric signal and outputs a voltage signal reflecting the gas holdup information;
the power supply module is used for supplying power to the integrated sensor;
the main controller control module is used for controlling the working mode of the conductive sensor module 16 and simultaneously acquiring flow and water holding rate information according to the frequency signal; calculating the water holdup according to the frequency signal processed by the capacitance signal processing module; and imaging according to the voltage signals of the array type optical fiber probe, and calculating the cross-section gas holding rate.
During operation, after gas-liquid separation, the water holding capacity of the oil-water two-phase flow is measured, the conductive sensor module 16 is adjusted to the working mode of the electric water holding capacity monitoring sensor, the full water phase of the oil-water two-phase flow is calibrated, namely the electric water holding capacity monitoring sensor is calibrated, and under the condition that water is a continuous phase, the voltage amplitude between the measuring electrodes M2 and M3 is in inverse proportion to the conductivity of the fluid passing through the electric water holding capacity monitoring sensor. Let the conductance of the measuring electrodes M2, M3 be G when the oil and water are mixedmG in the case of total waterwThe electrical conductivity of the mixed phase is σmThe electrical conductivity of water is σwThe output frequency of the sensor is F during phase mixingm(mixed phase value) total water value of Fw(total water value) of
σmAnd σwThe ratio is given by the Maxwell formula:
wherein β is the volume fraction of continuous conductive phase in two-phase flow, and the electric water holding rate h is the volume fraction of continuous conductive phase in oil-water two-phase flowi。
The water holding rate refers to the volume percentage of the water phase at a certain position of a shaft, the ratio of the total water value to the mixed phase value in the formula (2) is called instrument relative response, the mixed phase value is measured when the oil-water two-phase fluid flows through a sensor, and the total water value can be obtained after the oil-water two phases are separated by connecting a sampler to the sensor.
Then, the conductance type sensor module 16 is adjusted to a conductance related flow monitoring sensor working mode, and two paths of flowing noise signals are subjected to cross-correlation operation, wherein the cross-correlation function expression is as follows:
tau refers to the time interval of similar waveforms of signals acquired by an upstream sensor and a downstream sensor and is acquired according to actual signals; the peak value of the cross-correlation function represents the maximum similarity of two flow noise signals and the corresponding time tau0Is the time, called the transit time, that the fluid flow noise signal has elapsed from upstream to downstream.
The flow rate f is:
f＝(L/τ0)*ap(4)
l in the formula (4) is an upstream-downstream distance, i.e., a distance from the center between the electrodes M1, M2 to the center between the electrodes M3, M4, apThe cross-sectional area of the sensor conduit is monitored for conductance-related flow.
The principle of the measuring part of the capacitance sensor module is to establish a relational expression (5) between the oil-water ratio and the capacitance so as to obtain the water holdup information. The capacitance excitation module is started to generate a capacitance excitation source to ensure that the capacitance sensor works normally; the capacitance signal processing module carries out filtering and other processing on the frequency signal; when the capacitance sensor is placed in the full oil phase environment, the output frequency is Fco(ii) a When the capacitance sensor is placed in the full water phaseOutput frequency of F in environmentcw(ii) a When the capacitance sensor is placed in the oil-water two-phase fluid to be measured, the output frequency is FcSetting the radius of the inner insulating layer of the capacitive sensor to be R0Inner diameter R of metal layer1Inner diameter R of outer insulation layer3Inner diameter R of metal housing2The relative dielectric constant of the insulating material is epsilonr1The relative dielectric constant of the metal layer and the dielectric of the metal shell is epsilonr2The relative dielectric constant of the oil phase is epsilonoilThe relative dielectric constant of the aqueous phase is εwaterDielectric constant of vacuum of epsilon0；
Determining the water holding rate of the fluid through the fluid capacitance as follows:
wherein, y in the above formulawNamely, the capacitance water holding rate h in the oil-water two-phase flowc。
The array type optical fiber sensor module 15 outputs a high-level voltage signal when the array type optical fiber probe detects a gas-phase medium when passing through an oil-water two-phase flow fluid containing a trace amount of gas phase; when detecting the liquid-phase medium, outputting a low-level voltage signal; according to different responses of gas-liquid phases, acquiring the section gas holdup h by adopting an image processing methodgAnd (6) estimating the value.
Fig. 5 shows a water holdup measuring system using the integrated sensor based on land gas-liquid separation, which includes a wellhead pipeline 1, a first electromagnetic valve 2, a second electromagnetic valve 3, a third electromagnetic valve 4, an inlet pipeline 5, a gas-liquid separation tank 6, an exhaust device 7, an integrated sensor 8 and an outlet pipeline 9;
the inlet pipeline 5 and the outlet pipeline 9 are respectively communicated to the wellhead pipeline 1, the first electromagnetic valve 2 is arranged on the wellhead pipeline 1 between the connecting holes of the inlet pipeline 5 and the outlet pipeline 9, and the second electromagnetic valve 3 and the third electromagnetic valve 4 are respectively arranged on the inlet pipeline and the outlet pipeline; the inlet pipeline 5 is communicated with the gas-liquid separation tank 6, the integrated sensor 8 is arranged inside the gas-liquid separation tank 6, the integrated sensor 8 is communicated with the outlet pipeline, and the top of the gas-liquid separation tank 6 is arranged on the exhaust device 7 communicated with the outlet pipeline 9;
when the water holdup measuring system does not work, the second electromagnetic valve 3 and the third electromagnetic valve 4 are closed, and the first electromagnetic valve 2 is opened; when the water holding capacity measuring system starts to work, the second electromagnetic valve 3 and the third electromagnetic valve 4 are opened, the first electromagnetic valve 2 is closed, oil-gas-water three-phase flow enters the gas-liquid separation tank 6 through an inlet pipeline, most of gas is discharged into the outlet pipeline 9 through the exhaust equipment 7, and oil-water two-phase flow containing trace gas phase enters the integrated sensor 8 from the gas-liquid separation tank 6 to measure the water holding capacity.
As shown in fig. 6-7, the present invention further provides a low-gas-volume oil-water retention correction method based on land gas-liquid separation, which adopts the integrated sensor, and comprises the following steps:
the capacitance sensor module is adopted to measure the water holding capacity of the oil-water two-phase flow containing trace gas phase after gas-liquid separation treatment, and the capacitance water holding capacity h is obtained according to capacitance signalsc；
Adopting the conductive sensor module to monitor the oil-water two-phase flow containing trace gas phase after gas-liquid separation treatment, and obtaining the conductive water holding rate h according to the conductive signaliAnd a flow rate f;
the array optical fiber sensor module is adopted to monitor the oil-water two-phase flow containing trace gas phase after gas-liquid separation treatment, and an image processing method is adopted to obtain the section gas holdup hgAn estimated value; specifically, a multi-neighbor interpolation imaging method and a region identification image processing method are combined to obtain the section gas holdup hgAn estimated value;
the water holding capacity h of the capacitorcAnd the water holding rate h of electric conductioniAs an information source, acquiring fusion water holdup h through data fusionm；
Will fuse the water holdup hmAnd section gas holdup hgAs characteristic parameters, a water holding rate correction model is constructed
hwIndicating the corrected water retention.
Further, the array type optical fiber sensor module adopts the method of obtaining the section gas holdup hgThe method for estimating the value specifically comprises the following steps:
step S1: a gap between the insulating rod and the inner insulating cylinder is divided into n layers of annular spaces;
step S2: interpolating and increasing the number of the measurement points of the optical fiber probe in each layer of annular space to m, wherein the measurement points with increased interpolation are interpolation points;
step S3: virtual data estimation is carried out on the interpolation points by adopting a multi-neighbor interpolation method, the virtual data estimation is carried out according to the weighting of the neighbor points, and the data estimation result is carried out according to the response data of the interpolation points of the neighbor points; the number of the neighbor points is set to be m, and the neighbor point selection rule is as follows: the actual measurement point which is close to the interpolation point and has the nearest distance is positioned at the adjacent layer of the annular space where the interpolation point is positioned, and only one adjacent point is selected in each layer of annular space; the multi-neighbor interpolation rule of the interpolation point is Zi＝α1Z1+α2Z2+α3Z3+α4Z4Wherein Zi, Z1, Z2, Z3 and Z4 represent voltage signals of actual measurement points respectively, and weight α1,α2,α3,α4Selecting flow f obtained by the conductive sensor module, wherein the flow in the pipeline is different, the distribution of gas in the pipeline is different, and the weight is determined according to the difference;
step S4: imaging the response signals of the actual measurement point and the interpolation point;
step S5: and carrying out region identification on the imaged gas phase distribution graph to obtain section gas holdup estimation information.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (3)
1. A gas-liquid separation integrated sensor based on land is characterized by comprising a conductive sensor module, a capacitance sensor module and an array optical fiber sensor module which are coaxially arranged;
the capacitance sensor module is respectively provided with a metal shell, an outer insulating cylinder, a metal layer and an inner insulating cylinder from outside to inside;
an insulating rod is arranged in the center of the capacitive sensor module, the conductive sensor module is positioned at one end of the insulating rod, and the conductive sensor module comprises six electrode rings;
the array optical fiber sensor module is fixed at the other end of the insulating rod and comprises an array optical fiber probe which is positioned in a gap between the insulating rod and the inner insulating cylinder, the array optical fiber probe comprises a plurality of optical fiber probes, measuring points of all the optical fiber probes are positioned on the same cross section, and the cross section is a radial cross section of the capacitance sensor module;
a gap between the insulating rod and the inner insulating cylinder is divided into n layers of annular spaces, the cross section is divided into m fan-shaped areas with a central angle of 360/m by taking the center of the cross section as a base point, measuring points of the optical fiber probes are all positioned on a separation line of the fan-shaped areas, m/2 measuring points of the optical fiber probes are arranged in each layer of annular space, an included angle formed by the measuring points of two adjacent optical fiber probes in the same layer of annular space and the center of the cross section is 180/m, and the total number of the measuring points of the optical fiber probes in two adjacent layers of annular spaces is m; the total number of the optical fiber probes is (m/2) multiplied by n; wherein N is more than or equal to 1, N belongs to N*；m≥1,m∈N*。
2. A low-gas-volume oil-water retention correction method based on land gas-liquid separation, which adopts the integrated sensor of claim 1, and is characterized by comprising the following steps:
the capacitance sensor module is adopted to measure the water holding capacity of the oil-water two-phase flow containing trace gas phase after gas-liquid separation treatment, and the capacitance water holding capacity h is obtained according to capacitance signalsc；
Adopting the conductive sensor module to monitor the oil-water two-phase flow containing trace gas phase after gas-liquid separation treatment, and obtaining the conductive water holding rate h according to the conductive signaliAnd a flow rate f;
the array optical fiber sensor module is adopted to monitor the oil-water two-phase flow containing trace gas phase after gas-liquid separation treatment, and an image processing method is adopted to obtain the section gas holdup hgAn estimated value;
the water holding capacity h of the capacitorcAnd the water holding rate h of electric conductioniAs an information source, acquiring fusion water holdup h through data fusionm；
Will fuse the water holdup hmAnd section gas holdup hgAs characteristic parameters, a water holding rate correction model is constructed
hwIndicating the corrected water retention.
3. The land gas-liquid separation-based low-air-volume oil-water retention correction method according to claim 2, wherein the array type optical fiber sensor module adopts a method for obtaining a cross-sectional gas retention hgThe method for estimating the value specifically comprises the following steps:
step S1: a gap between the insulating rod and the inner insulating cylinder is divided into n layers of annular spaces;
step S2: interpolating and increasing the number of the measurement points of the optical fiber probe in each layer of annular space to m, wherein the measurement points with increased interpolation are interpolation points;
step S3:virtual data estimation is carried out on the interpolation points by adopting a multi-neighbor interpolation method, the virtual data estimation is carried out according to the weighting of the neighbor points, the number of the neighbor points is set to be m, and the rule of selecting the neighbor points is as follows: the actual measurement point which is close to the interpolation point and has the nearest distance is positioned at the adjacent layer of the annular space where the interpolation point is positioned, and only one adjacent point is selected in each layer of annular space; the multi-neighbor interpolation rule of the interpolation point is Zi＝α1Z1+α2Z2+α3Z3+α4Z4Wherein Zi, Z1, Z2, Z3 and Z4 represent voltage signals of actual measurement points respectively, and weight α1,α2,α3,α4Selecting according to the flow f obtained by the conductance sensor module;
step S4: imaging the response signals of the actual measurement point and the interpolation point;
step S5: and carrying out region identification on the imaged gas phase distribution graph to obtain section gas holdup estimation information.
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