CN104988513B - The GIC measuring methods and device of buried oil-gas pipeline and cathode protection device - Google Patents

The GIC measuring methods and device of buried oil-gas pipeline and cathode protection device Download PDF

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CN104988513B
CN104988513B CN201510329626.1A CN201510329626A CN104988513B CN 104988513 B CN104988513 B CN 104988513B CN 201510329626 A CN201510329626 A CN 201510329626A CN 104988513 B CN104988513 B CN 104988513B
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mrow
gic
cathode protection
current
msub
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CN201510329626.1A
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CN104988513A (en
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梁志珊
赵耀峰
夏鹏程
生龙
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中国石油大学(北京)
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Abstract

The invention discloses the GIC measuring methods of a kind of buried oil-gas pipeline and cathode protection device and device; the electric current in buried oil-gas pipeline is measured by installing current sensor additional in the buried oil-gas pipeline insulating flange hook line cable located where cathodic protection station; electric current and voltage sensor are installed in cathode protection device to measure the electric current and voltage in cathode protection device; and buried oil-gas pipeline electric resistance of soil parameter is updated using the parameter identification method of on-line study, the GIC dynamic currents of buried oil-gas pipeline and cathode protection device are calculated in real time.The measuring method efficiently solves measurement the problems of GIC and cathode protection device dynamic current indirectly; realize the GIC accurate measurements of the buried oil-gas pipeline GIC and cathode protection device at cathodic protection station place; influence of the geomagnetic storm to buried oil-gas pipeline can be correctly assessed, and takes defensive measure in time to avoid the generation of major accident.

Description

The GIC measuring methods and device of buried oil-gas pipeline and cathode protection device

Technical field

The present invention relates to buried oil-gas pipeline GIC monitoring technical fields, and in particular to a kind of buried oil-gas pipeline and negative electrode The GIC measuring methods and device of protection device.

Background technology

With the rapid development of the national economy, demand cumulative year after year of the country to oil and natural gas.Undoubtedly, bury The national energy supply of the Fast Construction of ground oil-gas pipeline (hereinafter referred to as pipeline) and development effective guarantee, promotes economic hair Exhibition.But at the same time, if safety failure occurs for pipeline, national economy operation generation can be had a strong impact on, if pipeline is let out Dew perforation, triggers fire explosion or accident, and more people's life, environment and national wealth can be caused to seriously endanger.Therefore, it should Strictly controlled in terms of design, construction and operational management, reduce contingency occurrence probability, it is to avoid severe and great casualty and environmental pollution The generation of event.Generally, the reason for accident occurs for pipeline is exactly metal erosion in addition to natural and man-made calamities, is especially managed DC stray current corrosion outside road.First, industry has been obtained in existing result of study to be concerned with:China's power network is outstanding It is south electric network DC transmission system monopole be grounded the method for operation when, burnt many pipeline cathode protection devices, it is right Guangdong pipeline, which has resulted in, to be had a strong impact on;Secondly, industry extensive concern is not up to the present obtained also is:With DC power transmission system The geomagnetic induction current that geomagnetic storm caused by space weather of the system with same property is produced is to the influence caused by pipeline.According to generation The geomagnetic storm Dst indicator databases statistics at boundary center shows that pipeline has the time of 2 to 3 months by medium every about annual And the influence of above rank geomagnetic storm.In addition, the electromagnetic impulse radiation produced by nuclear blast to the Influencing Mechanism of pipeline also with earth magnetism It is sudden and violent similar.From national strategy angle, nuclear blast influence problem has obtained the very big pass about industry and administrative department Note.Because DC transmission system, geomagnetic storm and nuclear blast galvanic properties produced in pipeline are close, so, of the invention special In profit, geomagnetic induction current GIC (Geomagnetically Induced Current) is referred to as.

Research shows, the essence that geomagnetic storm influences on pipeline, and one is to cause pipeline to produce higher pipe to soil potential PSP (Pipe to Soil Potential);Two be that GIC is produced in pipeline.Limitation and point defeated station reason due to geographical conditions, Oil/Gas Pipe net laying sets out the complex situations such as existing turning, branch, geographical fluctuating, height above sea level change, different resistivity region so that The pipeline GIC and pipe of geomagnetic storm and the conventional cathode protection generation designed by galvanic corrosion local influence with global impact Ground potential PSP distribution characteristics is entirely different.Its harm is divided into three aspects, first, general corrosion.Pipe to soil potential PSP can surpass National cathodic protection critical field is crossed, so that conventional cathode protection is out of hand, therefore, geomagnetic storm can accelerate metallic conduit Corrosion.Second, for the pipeline with local corrosion, pipe to soil potential PSP is higher, is flowed into or from existing local corrosion Electric current is bigger, causes corrosion more serious or even generation electric arc causes the burst accidents such as pipeline oil-gas leaking and blast.3rd, it is right In equipment such as the cathode protection device with earth point, instrument and the sensors being connected with pipeline, GIC electric currents can influence its normal Work can even be burnt by its earth point.

Correctly to assess influence of the geomagnetic storm to pipeline and take defensive measure, it is necessary to accurately measure pipeline GIC and Cathode protection device GIC, this basic research work that is very important.But there are two most distinct issues:

(1) the problem of measurement GIC is present indirectly

For the buried pipeline of the normal operation laid, because it is relatively large in diameter, current transformer is installed on pipeline Construction is very inconvenient, in addition, cathode protection device is also in operation.So, accurately measure it and compared by the GIC electric currents of pipeline It is difficult.

General pipeline GIC measuring principle is to utilize the induced field intensity produced by magnetometer survey GIC, utilizes electricity Law of magnetism calculates and obtains GIC indirectly.Common magnetic strength (is applied and doubted, Guo Wensheng, Cao's fluxgates flat greatly are sensed in respect of flux-gate magnetometer The application of device and development [J] mine warfares and warship's safety, 2002,01:36-38.), superconductive quantum interference magnetometer (Zeng Zhaofa, King river .SQUID and application [J] Advances in Geophysics in geophysics, 2003,04:608-613.) etc..Fluxgate The sensor of magnetometer is the transformer being wound on high magnetic permeability core.Operation principle is:Iron core magnetic conductivity is with excitation field intensity And become, in the presence of tested magnetic field, the even-order harmonic component become with tested magnetic field intensity just occurs in induced potential, and When iron core is in periodically supersaturated working condition, even-order harmonic component is significantly increased.The amplitude of all even-order harmonics and Phase is proportional to intensity and the direction in probe shaft phase magnetic field.In fact, even-order harmonic is very weak compared to odd harmonic.Use Two parallel, magnetizing coil differential concatenations of single iron cores probe, induction coil series aiding connection so that odd harmonic cancels each other, and Even harmonics signal is overlapped mutually.So, tested magnetic field is assured that by the change for measuring and analyzing even harmonics signal.

Double fluxgate mensurations are that WallaceH Campbell and James E.Zimmerman are carried in the eighties in last century Go out (Campbell W H, Zimmerman JE 1980IEEE T.Geosci.Remote 18 are 244.).In measurement pipeline During GIC, the magnetic field B of pipeline is made up of two parts:Magnetic field and the environment field of pipeline that GIC is produced in pipeline. One fluxgate magnetic core is placed in parallel at pipeline 10m with pipeline, recording magnetic field change.Measured magnetic field is the GIC in pipeline The magnetic field produced in the point and the environmental magnetic field sum of the point.It can be seen that, measured using single fluxgate magnetic core in measured magnetic field Not only include the magnetic field that GIC is produced at probe, include the environmental magnetic field of the point.In order to eliminate shadow of the environmental magnetic field to measurement Ring, so using double fluxgate difference measurements.U.S. Alaska pipeline surveys GIC is exactly to make in this way.This method sheet It is to measure the magnetic field intensity that GIC is produced using fluxgate in matter, calculates indirectly and obtain GIC, it is impossible to obtain real-time and accurate GIC Data.

WallaceH Campbell and James E.Zimmerman, which also proposed, uses superconductive quantum interference magnetometer (SQUID Magnetometer) measures magnetic field gradient.SQUID magnetometers are substantially same fluxgate, magnetometer measures GIC mono- Sample, is the magnetic field intensity produced in externally measured GIC, is then calculated by the relation in electric current and magnetic field and obtains GIC.

In addition, having used shunting meter to measure pipeline GIC in U.S. Chena testing stations.Chena testing stations are at 650 feet Current divider is installed on long pipeline, the resistance on this segment pipe is obtained by other technologies means first, known canal electrical resistance, In the case of current divider resistance, the proportionate relationship shunted using canal electrical resistance and current divider branch road can be in the hope of bus current.By Can not accurately it be obtained in the resistance on pipeline, so error is very big.

So, without using the indirect measurement pipeline GIC of current transformer method, due to needing pipeline and its environmental background The information such as parameter, in addition, also being influenceed by background electromagnetic field, therefore, measurement accuracy is poor.

(2) influence that cathode protection device dynamic current is measured GIC

When measuring GIC, due to cathode protection device still in operation, so, the electric current that scene is measured is earth induction With the composite result of cathodic protection power supply, it should which operating cathodic protection dynamic current is isolated from current measured value The real GIC to be surveyed can be just obtained after coming.

The content of the invention

For solving to measure the above-mentioned two outstanding problem present in GIC in the prior art, buried the invention provides one kind Ground oil-gas pipeline GIC and cathode protection device GIC measuring method and device, pass through the buried oil located where cathodic protection station The electric current that current sensor comes in the buried oil-gas pipeline of direct measurement is installed additional in feed channel insulating flange hook line cable, is protected in negative electrode Electric current and voltage sensor are installed in protection unit to measure the electric current and voltage in cathode protection device, and use on-line study Parameter identification method update buried oil-gas pipeline electric resistance of soil parameter, buried oil-gas pipeline and cathodic protection dress are calculated in real time The problems of GIC dynamic currents put, realize the buried oil-gas pipeline GIC at cathodic protection station place and cathodic protection The GIC accurate measurements of device, can correctly assess influence of the geomagnetic storm to buried oil-gas pipeline, and take defence to arrange in time Apply to avoid the generation of major accident.

To achieve these goals, the present invention is adopted the following technical scheme that.

A kind of buried oil-gas pipeline GIC and cathode protection device GIC measuring method, this method includes:

Step 1, by installing electric current additional in the buried oil-gas pipeline insulating flange hook line cable located where cathodic protection station Electric current in sensor, the buried oil-gas pipeline of direct measurement;

Step 2, using the parameter identification method of on-line study, buried oil-gas pipeline electric resistance of soil parameter is updated, in real time meter Calculate the GIC dynamic currents of buried oil-gas pipeline and cathode protection device.

Preferably, the buried oil-gas pipeline insulating flange hook line located where the cathodic protection station electricity as described in step 1 Install electric current in the buried oil-gas pipeline of current sensor measurement in cable additional, specifically include:

Step 11, the main pipeline out of the station of cathodic protection station passes through insulating flange hook line cable connection, each negative electrode Protection station is provided with two sets of thunderstorm electricity protective devices and two sets cathode protection devices, its by the cathode cable on the outside of insulating flange and Main pipeline connection out of the station;

Step 12, output voltage sensor and current sensor are installed on cathode protection device, and added at hook line cable Fill a current sensor.

In any of the above-described technical scheme preferably, the parameter identification method of the use on-line study as described in step 2 To update buried oil-gas pipeline electric resistance of soil parameter, the GIC dynamic electrics of buried oil-gas pipeline and cathode protection device are calculated in real time Stream, is specifically included:

Hook line cable current point on the left of cathode protection device electric current, cathode protection device when step 21, to without geomagnetic storm Relation not between cathode protection device output voltage carries out online data fitting;

Step 22, using least square method On-line Estimation solving model electric resistance of soil parameter;

Step 23, data record is carried out when without geomagnetic storm, sets up historical data base;

Step 24, data record is carried out when there is geomagnetic storm;

Step 25, the current instantaneous value of buried oil-gas pipeline and cathode protection device GIC at cathodic protection station place is entered Row is solved.

To achieve these goals, present invention also offers a kind of buried oil-gas pipeline GIC and cathode protection device GIC Measurement apparatus, the measurement apparatus include sensor, power supply, signal conditioning circuit, pci data analog input card, GPS time service modules, Communication module and industrial computer.

In any of the above-described technical scheme preferably, power supply connection sensor, signal conditioning circuit, pci data collection Board, GPS time service modules, GPS time service modules connection industrial computer, industrial computer connecting communication module.

In any of the above-described technical scheme preferably, pipe to soil potential PSP, pipeline hook line current, cathode protection device Cathode current, the output voltage of cathode protection device this four tunnels measurement signal after the arrangement and isolation of signal conditioning circuit, Each acquisition channel for being separately input to pci data analog input card carries out signal acquisition, and the observation interface of industrial computer is shown in real time With data are locally stored, data are transmitted to GIC security evaluations center by communication module and analyzed and processed.

In any of the above-described technical scheme preferably, the sensor is connected with signal conditioning circuit, the sensing Device includes Hall voltage sensor and Hall current sensor, Hall voltage sensor and Hall current sensor be closed loop suddenly That sensor.

In any of the above-described technical scheme preferably, the signal conditioning circuit and Hall voltage sensor, Hall electricity Flow sensor and pci data analog input card are connected, amplification, filtering, isolation and transmission for gathering signal.

In any of the above-described technical scheme preferably, the pci data analog input card and signal conditioning circuit and industry control Machine is connected, for data acquisition and control.

In any of the above-described technical scheme preferably, the GPS time service modules are connected with industrial computer, are set for realizing Standby time synchronized.

In any of the above-described technical scheme preferably, the industrial computer and pci data analog input card, GPS time service modules And communication module is connected, for data display and storage.

In any of the above-described technical scheme preferably, the communication module is connected with GIC security evaluations center, is used for Realize the long-distance transmissions of data.

The buried oil-gas pipeline GIC and cathode protection device GIC of the present invention measuring method and device, the measuring method are led to Cross in the buried oil-gas pipeline insulating flange hook line cable located where cathodic protection station and install current sensor additional, can direct measurement Electric current in buried oil-gas pipeline, had so both been avoided using information such as pipeline and its environmental background parameters, also will not be by background The influence of electromagnetic field;Buried oil-gas pipeline electric resistance of soil parameter is updated using the parameter identification method of on-line study, and in real time Cathode protection device dynamic current is calculated, the real GIC to be surveyed is finally obtained.The measuring method is efficiently solved " to be surveyed indirectly The two are measured present in GIC most in the prior art for amount GIC " and " cathode protection device dynamic current, which is measured GIC, to be influenceed " Distinct issues, the GIC for realizing the buried oil-gas pipeline GIC at cathodic protection station place and cathode protection device is accurately supervised Survey.Buried oil-gas pipeline GIC and cathode protection device GIC measurement apparatus include sensor, power supply, signal conditioning circuit, PCI Data collecting plate card, GPS time service modules, communication module and industrial computer, by its DATA REASONING, data transfer, collection is synchronous, fill Put positioning, prediction and alarm, safe anti-explosion function, it is possible to achieve GIC is measured in each pipeline compressor station of deployment throughout the country The data acquisition of device, storage, transformation task.Using buried oil-gas pipeline GIC and cathode protection device the GIC measurement of the present invention Method and device, can correctly assess influence of the geomagnetic storm to buried oil-gas pipeline, and take defensive measure to keep away in time Exempt from the generation of major accident.

Brief description of the drawings

Fig. 1 is according to the one excellent of the buried oil-gas pipeline of the present invention and the GIC measuring methods of cathode protection device and device Select the buried oil-gas pipeline and cathode protection device GIC measuring method flow charts of embodiment;

Fig. 2 is according to the one excellent of the buried oil-gas pipeline of the present invention and the GIC measuring methods of cathode protection device and device Select the cathodic protection station structural representation of embodiment;

Fig. 3 a are according to the one excellent of the buried oil-gas pipeline of the present invention and the GIC measuring methods of cathode protection device and device Pipeline equivalent circuit diagram when selecting the cathode cable of embodiment positioned at outbound (downstream) side;

Fig. 3 b are according to the one excellent of the buried oil-gas pipeline of the present invention and the GIC measuring methods of cathode protection device and device Select embodiment cathode cable be located at enter the station (upstream) side when pipeline equivalent circuit diagram;

Fig. 4 is according to the one excellent of the buried oil-gas pipeline of the present invention and the GIC measuring methods of cathode protection device and device Select the flow chart of electric current in the measurement pipeline of embodiment;

Fig. 5 is according to the one excellent of the buried oil-gas pipeline of the present invention and the GIC measuring methods of cathode protection device and device Select the renewal pipe-line system parameter of embodiment and calculate the flow chart that cathode protection device dynamic current obtains surveyed GIC in real time;

Fig. 6 is according to the one excellent of the buried oil-gas pipeline of the present invention and the GIC measuring methods of cathode protection device and device Select the buried pipeline GIC supervising device data acquisition hardware structural representations of embodiment;

Embodiment

The present invention is elaborated with reference to the accompanying drawings and detailed description, describes only to conciliate as demonstration below Release, any formal limitation is not made to the present invention.

As shown in figure 1, the GIC measuring methods of buried oil-gas pipeline and cathode protection device include step 1,2:

Step 1, by installing electric current additional in the buried oil-gas pipeline insulating flange hook line cable located where cathodic protection station Electric current in sensor, the buried oil-gas pipeline of direct measurement;

Step 2, using the parameter identification method of on-line study, buried oil-gas pipeline electric resistance of soil parameter is updated, in real time meter Calculate the GIC dynamic currents of buried oil-gas pipeline and cathode protection device.

Process pipe and main pipeline out of the station are respectively by two in the station of general gas pipeline pigging station (cathodic protection station) Individual insulating joint is electrically insulated, and main pipeline out of the station is got up by hook line cable connection.Two are installed in each pigging station Thunderstorm electricity protective device and two sets of cathode protection devices (a set of work, another set of standby) are covered, pass through the negative electrode on the outside of insulating flange Cable is connected with main pipeline out of the station.Cathodic protection station structure is as shown in Figure 2.

When there is GIC in main pipeline in geomagnetic storm generation, equivalent circuit such as Fig. 3 a after access cathode protection device Shown in Fig. 3 b.Specifically, when cathode cable is located at outbound (downstream) side, the equivalent circuit diagram after access cathode protection device As shown in Figure 3 a;When cathode cable, which is located at, enters the station (upstream) side, equivalent circuit diagram such as Fig. 3 b after access cathode protection device It is shown.

As shown in figure 4, the step 1 of the GIC measuring methods for above-mentioned buried oil-gas pipeline and cathode protection device, The buried Oil/Gas Pipe of current sensor measurement is installed additional in buried oil-gas pipeline insulating flange hook line cable at where cathodic protection station Electric current in road, specifically includes step 11,12:

Step 11, the main pipeline out of the station of cathodic protection station passes through insulating flange hook line cable connection, each negative electrode Protection station is provided with two sets of thunderstorm electricity protective devices and two sets cathode protection devices, its by the cathode cable on the outside of insulating flange and Main pipeline connection out of the station;

Step 12, output voltage sensor and current sensor are installed on cathode protection device, and added at hook line cable Fill a current sensor.

As shown in figure 5, the step 2 of the GIC measuring methods for above-mentioned buried oil-gas pipeline and cathode protection device, makes Buried oil-gas pipeline electric resistance of soil parameter is updated with the parameter identification method of on-line study, calculate in real time buried oil-gas pipeline and The GIC dynamic currents of cathode protection device, are specifically included:

Hook line cable current point on the left of cathode protection device electric current, cathode protection device when step 21, to without geomagnetic storm Relation not between cathode protection device output voltage carries out online data fitting;

Step 22, using least square method On-line Estimation solving model electric resistance of soil parameter;

Step 23, data record, wherein:

Data record is carried out when without geomagnetic storm, historical data base is set up;

Data record is carried out when there is geomagnetic storm;

Step 24, the current instantaneous value of buried oil-gas pipeline and cathode protection device GIC at cathodic protection station place is entered Row is solved.

In pipeline geomagnetic induction current GIC and cathode protection device when being located at outbound (downstream) side with cathode cable below The GIC of inflow is calculated and measuring method.

Assumed condition:First, the cathode protection device installed additional on pipeline can be equivalent to regulated power supply E and equivalent internal resistance r, Its output voltage is V;Second, the equivalent resistance of soil is between the upstream line and anode of protected upstream and downstream pipeline bed R1, the equivalent resistance of soil is R between downstream line and anode bed2;3rd, where pipeline cathode protection station at cathode weld point The GIC electric currents in left side are IGIC(t), the GIC electric currents on the right side of cathode weld point are I 'GIC(t);Upstream and downstream pipeline flows in and out the moon The equivalent G IC electric currents at pole protection station are respectively IGIC1And I (t)GIC2(t)。

Because cathode cable has two kinds of different positions, so having two kinds not when measuring the GIC at cathodic protection station place Same situation.Cathode cable is taken to be located at outbound side situation, the geomagnetic induction current GIC provided here at cathodic protection station place is instantaneous It is worth On-line Measuring Method, as described below:

1) current sensor is installed

Output voltage sensor V and current sensor A itself are installed on cathode protection device0.For accurate measurement GIC, should also install a current sensor A additional at hook line cable1.Wherein, the installation site and positive direction of each instrument are just like figure Two kinds of modes of connection shown in 3a and 3b.

2) cathode protection device electric current A when to without geomagnetic storm00(t), hook line cable current A on the left of cathode protection device10 (t) respectively with output voltage V0(t) online fitting of relation between

It can be seen from the first mode of connection of pipeline equivalent circuit diagram as shown in Figure 3 a:

Cathode protection device negative electrode right current is inconvenient to measure, and its calculated value is

A20(t)=A00(t)-A10(t) (1)

Here,

Wherein, E is the equivalent potential of cathode protection device, and r is the equivalent internal resistance of cathode protection device, and R is the painting of pipeline Layer equivalent resistance.The equivalent resistance of soil is R between upstream line and anode bed1(t), soil between downstream line and anode bed Equivalent resistance be R2(t).E, R and r are known parameter, and R1And R (t)2(t) it can change with the change of environment.

Hook line cable current A on the left of cathode protection device can be obtained by circuit10And A (t)20(t) exported with cathode protection device Voltage V0(t) relation between

The electric current A of pipeline cathode protection device can be obtained by circuit00(t) with cathode protection device output voltage V0(t) between Relation

From (3) formula and (4) formula, A00And A (t)10(t) by pipeline coatings resistance R, upstream line and anode bed Between soil equivalent resistance R1(t), downstream line and anode bed between soil equivalent resistance R2(t) influence.R1And R (t)2 (t) changed because being influenceed by the change of air weather environment.

3) LEAST SQUARES MODELS FITTING parameter Estimation is used

(there is no geomagnetic storm now, only cathode protection device is individually transported when system is normally run or done experiment OK), at a time t, the output quantity of acquisition system:The electric current A of pipeline cathode protection device00(t), on the left of cathode protection device Hook line cable current A10(t), the input quantity u of acquisition system:Cathode protection device output voltage V0(t) data.Store multigroup the moon Electrode protector output voltage V0(t) with the electric current A of pipeline cathode protection device00(t), hook line cable on the left of cathode protection device Electric current A10(t) relation data, by (3) formula and (4) formula, uses least square method parameter Estimation side as historical data base Method, On-line Estimation solves R1And R (t)2(t) model parameter such as.

Use Least Square Method model parameter R1And R (t)2(t) process description:

(3) formula of arrangement and (4) formula, are obtained

Wherein,

Below to parameter alpha1Carry out least-squares estimation.

If a1It is α1Least-squares estimation value, then (5) formula write as

Wherein, A10(k)、V0(k) be the kth moment observation, e (k) is the error estimate at kth moment, referred to as residual error, K=1,2 ..., n, n for observation data length.

Make A10(k) it is A10(k) estimate, then

Estimate is wanted with the best of actual value fitting, it is necessary to make the quadratic sum of residual error minimum, i.e.,

Obtain minimum value.Therefore, we ask extremum principle to determine a using differential1Value, that is, solve following equation

I.e.

Arrange and abbreviation above formula, obtain

Above formula is solved, can be obtained

(14) formula is parameter alpha in (5) formula1Least-squares estimation.

And then R can be solved2(t)

Similarly, R can be tried to achieve1(t) value.

4) when carrying out data record without magnetic storm time, historical data base is set up

Record data:The numerical value A of cathode protection device current sensor and hook line cable current sensor00And A10, negative electrode Protection device output voltage sensor numerical value is V0, set up historical data base.

5) dynamic data record is carried out when there is geomagnetic storm

When spot magnetic storm time (now cathode protection device also in operation), in synchronization, collection pipe cathode is protected The cathode current A of protection unit01(t), cathode protection device left current A11(t) with output voltage V1(t) three data.Work as earth magnetism Sudden and violent and cathode protection device according to principle of stacking, has when concuring

Hook line cable current Instantaneous relation on the left of cathode protection device

A11(t)=A10(t)+IGIC(t) (16)

Cathode protection device pad right current Instantaneous relation

A21(t)=A20(t)-I′GIC(t) (17)

Cathode protection device current instantaneous value relation

A01(t)=A00(t)+ΔIGIC(t) (18)

Cathode protection device cathode weld point right current instantaneous value

A21(t)=A01(t)-A11(t) (19)

6) pipeline GIC current instantaneous value is solved at cathodic protection station place

By (16) formula, (17) formula and (18) formula, have

Hook line cable GIC current instantaneous values I on the left of cathode protection deviceGIC(t)

IGIC(t)=A11(t)-A10(t) (20)

GIC current instantaneous values I ' on the right side of cathode protection device cathode weld pointGIC(t)

I′GIC(t)=A20(t)-A21(t) (21)

Cathode protection device negative electrode GIC current instantaneous value Δs IGIC(t)

ΔIGIC(t)=A01(t)-A00(t) (22)

(1) formula and (19) formula are brought into (21) formula, obtained

GIC current instantaneous values I ' on the right side of cathode protection device cathode weld pointGIC(t)

I′GIC(t)=A00(t)-A01(t)+A11(t)-A10(t) (23)

In formula, A00And A (t)10(t) numerical value determines that method is:Can be in historical data base V0(t) V is found in0(t) it is equal to V1(t) A corresponding to00And A (t)10(t) current value is substituted.So, using formula (20) formula, (22) formula and (23) formula, just The instantaneous value of the GIC electric currents of each position at cathodic protection station can be calculated.

The pipeline of the first mode of connection when above giving cathode protection device cathode cable positioned at outbound (downstream) side The GIC flowed into geomagnetic induction current GIC and cathode protection device is calculated and measuring method.Similarly, cathodic protection can be obtained Device cathode cable is located at the pipeline geomagnetic induction current GIC of Second Linking Method mode and cathodic protection dress when entering the station (upstream) side The GIC for putting middle inflow is calculated and measuring method, is repeated no more here.

The GIC measurement apparatus of buried oil-gas pipeline and cathode protection device include sensor, power supply, signal conditioning circuit, Pci data analog input card, GPS time service modules, communication module, industrial computer, as shown in fig. 6, the power supply connection of the measurement apparatus is passed Sensor, signal conditioning circuit, pci data analog input card, GPS time service modules, GPS time service modules connection industrial computer, industrial computer connect Connect communication module.GIC measurement apparatus is deployed in each pipeline compressor station, nationwide.Thus, GIC measurement apparatus load Bear data acquisition, storage, the task of transmission.

Knowable to GIC measuring methods calculating process based on foregoing buried oil-gas pipeline and cathode protection device, measurement signal There are four, including:Pipe to soil potential V1, pipeline hook line current A1, cathode protection device cathode current A0, cathode protection device Output voltage V.This four tunnels measurement signal is separately input to pci data and adopted after signal conditioning circuit is arranged and is isolated Collect each acquisition channel of board, carry out signal acquisition;Shown and be locally stored in real time in the observation interface of industrial computer, led to Cross communication module and data are subjected to long-distance transmissions;GIC security evaluations center is received after data, and data are carried out at analysis Reason.

Sensor is connected with signal conditioning circuit, and sensor includes Hall voltage sensor and Hall current sensor, Hall voltage sensor and Hall current sensor are Closed Loop Hall.Signal conditioning circuit is sensed with Hall voltage Device, Hall current sensor and pci data analog input card are connected, amplification, filtering, isolation and transmission for gathering signal. Pci data analog input card is connected with signal conditioning circuit and industrial computer, for data acquisition and control.GPS time service modules with Industrial computer is connected, the time synchronized for realizing equipment.Industrial computer and pci data analog input card, GPS time service modules and communication Module is connected, for data display and storage.Communication module is connected with GIC security evaluations center, for realizing data Long-distance transmissions.

Buried pipeline GIC measurement apparatus with above-mentioned hardware configuration has following function:

1) DATA REASONING function:Accurately measure the signal of each acquisition channel, and display in real time and storage in a device;

2) data-transformation facility:By 3G or 4G wireless networks, the GIC data measured are transferred to GIC and commented safely by device Estimate center, carry out Data Analysis Services;

3) synchronizing function is gathered:By gps time module, the clock source of same gps satellite is obtained, the sampling of system is used as Clock source so that the data collection synchronous of each monitoring device;

4) device positioning function:By d GPS locating module, the positional information of device is positioned, facilitates GIC to comment safely Estimate center and carry out date comprision;

5) prediction and alarm function:When the GIC current values measured continue for some time in transfinite state when, device can be carried out Prediction and alarm, closes cathode protection device, prevents excessive GIC electric currents from causing to damage to cathode protection device;

6) safe anti-explosion function:Device is equipped with safety anti-explosive module, prevents when carrying out current-voltage measurement to pipeline, dress Put and influence is produced on pipeline, reduce harm of the measurement behavior to pipeline.

For buried pipeline GIC supervising devices, its hardware components:

1) firstly, for sensor:Buried pipeline GIC measuring methods have been noted above, and used sensor is suddenly That voltage sensor and Hall current sensor.According to the requirement of the system, the selection higher Closed Loop Hall of precision, Its principle is to utilize magnetic balance, and the magnetic field produced by primary current is compensated by the magnetic field produced by secondary coil electric current, from And make the hall device working condition in monitoring Zero flux all the time.

By the performance and price of the Closed Loop Hall of relatively more each manufacturer, final choice lime (LEM) company LA305-S types closed-loop Hall current sensor and LV25-200 type Hall voltage sensors.Closed-loop Hall current sensor is main There are following characteristics:1. random waveform electric current, such as direct current, exchange, pulse current can be measured simultaneously;2. secondary measures electric current and original Side is electrically isolated completely between being tested electric current;3. magnetic induction intensity is extremely low in magnetic core, but makes magnetic core saturation, will not also produce big Magnetic hystersis loss and eddy-current loss;4. the linearity is fine;5. the response time is fast;6. frequency response range is wide, such as in 0-100kHz Range of signal is responded.

2) for industrial computer:Due to being operated at the scene, there are the ambient influnences such as stronger vibration, electromagnetic interference, control Equipment selection is the good industrial computer of reliability height, real-time.Selected model grinds magnificent IPC-610MB, and the type uses AIMB- With 2 com ports, 8 USB2.0 interfaces, 5 on 763VG mainboard, Intel Pentium Dual Cores E5300 (2.6G) CPU, plate Pci interface, 1 PCIexl/PCIex16 interface, 1 PCI-Express, internal memory 1G, hard disk 160GB, video card 224M.

3) for GPS time service modules:GIC measurement apparatus is placed in different pipeline compressor stations, each measuring terminals Be dispersed in all parts of the country, it is necessary to be positioned to it.Buried pipeline GIC security evaluations platform is carried out at analysis to data , it is necessary to which the data acquisition of each device is synchronous during reason, thus need to carry out GIC measurement apparatus with gps time server Positioning and clock source output, it is ensured that the synchronization of the data acquisition of whole network.

GPS time service modules are the high-tech for being calibrated, positioning for computer, control device in automated system etc. Product, it obtains the time signal of standard from gps satellite, these information is transferred into automation by various interface types The equipment (computer, protection device etc.) of temporal information is needed in system, time synchronized is realized.Simultaneously by GIC measurement apparatus Positional information is sent to CELA, with very high precision.

The HS-105 type GPS time service modules of the system final choice technical grade, the GPS location synchronised clock precision of the product ± 0.000001 second/day is reached, the system data acquisition request is fully met.

4) for signal conditioning circuit:Signal condition refers to before data enter capture card, to signal analogy method The processing of progress, the purpose is to the signal collected is transformed into the processing form of appropriate signal, so as to meet capture card input Requirement.Modulate circuit used in the system mainly includes several functions:Signal amplification, filtering and isolation etc..

5) for pci data capture card:In analog signal after preliminary conditioning, subsequently flow into PCI-8361BN data and adopt Truck is acquired.The capture card is 8 road simultaneous data-acquisitions of Beijing Zhong Tai companies, its simulation of sampling rate to 50KHz The resolution ratio of amount is 16, you can to tell 1/216≈ 0.000015V, with very high resolution ratio and precision, meeting this is System data acquisition request.

6) for communication module:The communication module of the system is using technical grade wireless routing MR-900 series, its built-in work Industry level 3G wireless modules, can realize remote data acquisition forwarding work(by the 3G wireless networks of CHINAUNICOM or telecommunications Can, do not limited by region, distance, wiring, quantity, information sends quick, accurate, and application operating is convenient.MR-900 series increases The performance optimization applied for high-rate wireless communication is added, can stablize, reliably work in unattended operation environment.Its data is passed Defeated theoretical upstream rate fully meets the requirement of the system data acquisition forwarding up to 5.3Mbps, downstream rate 7.2Mbps.

Described above is only that the preferred embodiment of the present invention is described, and is not that the scope of the present invention is limited Fixed, on the premise of design spirit of the present invention is not departed from, this area ordinary skill technical staff makees to technical scheme In the various modifications gone out and improvement, the protection domain that claims of the present invention determination all should be fallen into.

Patent of the present invention obtains project of national nature science fund project support, project name:Chaos geomagnetic induction current is to burying Ground oil-gas pipeline influence and countermeasure (bullets:51071176).

Claims (9)

1. the GIC measuring methods of a kind of buried oil-gas pipeline and cathode protection device, it is characterised in that:This method includes:
Step 1, by installing current sense additional in the buried oil-gas pipeline insulating flange hook line cable located where cathodic protection station Electric current in device, the buried oil-gas pipeline of direct measurement;
Step 2, using the parameter identification method of on-line study, buried oil-gas pipeline electric resistance of soil parameter is updated, calculates bury in real time The GIC dynamic currents of ground oil-gas pipeline and cathode protection device, are specifically included:
Cathode protection device electric current when step 21, to without geomagnetic storm, on the left of cathode protection device hook line cable current respectively with Relation between cathode protection device output voltage carries out online data fitting;
Step 22, using least square method On-line Estimation solving model electric resistance of soil parameter, i.e., made by formula (14) and (15) Least square method method for parameter estimation is used, On-line Estimation solves model parameter:
<mrow> <msub> <mi>a</mi> <mn>1</mn> </msub> <mo>=</mo> <mfrac> <mrow> <munderover> <mo>&amp;Sigma;</mo> <mrow> <mi>k</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>n</mi> </munderover> <msub> <mi>A</mi> <mn>10</mn> </msub> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <msub> <mi>V</mi> <mn>0</mn> </msub> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>-</mo> <mfrac> <mi>E</mi> <mi>r</mi> </mfrac> <munderover> <mo>&amp;Sigma;</mo> <mrow> <mi>k</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>n</mi> </munderover> <msub> <mi>V</mi> <mn>0</mn> </msub> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> </mrow> <mrow> <munderover> <mo>&amp;Sigma;</mo> <mrow> <mi>k</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>n</mi> </munderover> <msup> <msub> <mi>V</mi> <mn>0</mn> </msub> <mn>2</mn> </msup> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> </mrow> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>14</mn> <mo>)</mo> </mrow> </mrow>
<mrow> <msub> <mi>R</mi> <mn>2</mn> </msub> <mrow> <mo>(</mo> <mi>t</mi> <mo>)</mo> </mrow> <mo>=</mo> <mo>-</mo> <mfrac> <mrow> <msub> <mi>&amp;alpha;</mi> <mn>1</mn> </msub> <mi>R</mi> <mi>r</mi> <mo>+</mo> <mi>R</mi> <mo>+</mo> <mi>r</mi> </mrow> <mrow> <mn>1</mn> <mo>+</mo> <msub> <mi>&amp;alpha;</mi> <mn>1</mn> </msub> <mi>r</mi> </mrow> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>15</mn> <mo>)</mo> </mrow> </mrow>
a1For least-squares estimation value, R2For the equivalent resistance of soil between downstream line and anode bed, R2(t) it is model parameter, Wherein, E is the equivalent potential of cathode protection device, and r is the equivalent internal resistance of cathode protection device, and R is the coating equivalent electric of pipeline Resistance, A10For hook line cable current on the left of cathode protection device, V0For the output voltage of cathode protection device, A10(k)、V0(k) it is The observation at kth moment;
Step 23, data record is carried out when without geomagnetic storm, sets up historical data base;
Step 24, data record is carried out when there is geomagnetic storm;
Step 25, the current instantaneous value of buried oil-gas pipeline and cathode protection device GIC at cathodic protection station place is asked Hook line cable GIC current instantaneous values I on the left of solution, cathode protection deviceGIC(t)
IGIC(t)=A11(t)-A10(t) (20)
Cathode protection device negative electrode GIC current instantaneous value Δs IGIC(t)
ΔIGIC(t)=A01(t)-A00(t) (22)
GIC current instantaneous values I ' on the right side of cathode protection device cathode weld pointGIC(t)
I′GIC(t)=A00(t)-A01(t)+A11(t)-A10(t) (23)
The instantaneous value of the GIC electric currents of each position at cathodic protection station is calculated using formula (20), (22) and (23),
Wherein, A00(t) cathode protection device electric current when being no geomagnetic storm, A01(t) be gather pipeline cathode protection device the moon Electrode current, A10(t) it is hook line cable current on the left of cathode protection device, A11(t) it is cathode protection device left current.
2. the GIC measuring methods of buried oil-gas pipeline and cathode protection device as claimed in claim 1, it is characterised in that:Such as Install current sensor survey in the buried oil-gas pipeline insulating flange hook line cable located where cathodic protection station described in step 1 additional Electric current in buried oil-gas pipeline is measured, is specifically included:
Step 11, the main pipeline out of the station of cathodic protection station is by hook line cable connection, and each cathodic protection station is provided with Two sets of thunderstorm electricity protective devices and two sets of cathode protection devices, it passes through the cathode cable on the outside of insulating flange and main line pipe out of the station Road is connected;
Step 12, output voltage sensor and current sensor are installed on cathode protection device, and one is installed additional at hook line cable Individual current sensor.
3. the GIC measurement apparatus of a kind of buried oil-gas pipeline and cathode protection device, it is used for as claimed in claim 1 or 2 The GIC measuring methods of buried oil-gas pipeline and cathode protection device, it is characterised in that:
The measurement apparatus includes sensor, power supply, signal conditioning circuit, pci data analog input card, GPS time service modules, communication mould Block, industrial computer, power supply connection sensor, signal conditioning circuit, pci data analog input card, GPS time service modules, GPS time service modules Connect industrial computer, industrial computer connecting communication module;
The GIC measuring method calculating process of buried oil-gas pipeline and cathode protection device includes:Made by formula (14) and (15) Least square method method for parameter estimation is used, On-line Estimation solves model parameter,
<mrow> <msub> <mi>a</mi> <mn>1</mn> </msub> <mo>=</mo> <mfrac> <mrow> <munderover> <mo>&amp;Sigma;</mo> <mrow> <mi>k</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>n</mi> </munderover> <msub> <mi>A</mi> <mn>10</mn> </msub> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <msub> <mi>V</mi> <mn>0</mn> </msub> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>-</mo> <mfrac> <mi>E</mi> <mi>r</mi> </mfrac> <munderover> <mo>&amp;Sigma;</mo> <mrow> <mi>k</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>n</mi> </munderover> <msub> <mi>V</mi> <mn>0</mn> </msub> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> </mrow> <mrow> <munderover> <mo>&amp;Sigma;</mo> <mrow> <mi>k</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>n</mi> </munderover> <msup> <msub> <mi>V</mi> <mn>0</mn> </msub> <mn>2</mn> </msup> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> </mrow> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>14</mn> <mo>)</mo> </mrow> </mrow>
<mrow> <msub> <mi>R</mi> <mn>2</mn> </msub> <mrow> <mo>(</mo> <mi>t</mi> <mo>)</mo> </mrow> <mo>=</mo> <mo>-</mo> <mfrac> <mrow> <msub> <mi>&amp;alpha;</mi> <mn>1</mn> </msub> <mi>R</mi> <mi>r</mi> <mo>+</mo> <mi>R</mi> <mo>+</mo> <mi>r</mi> </mrow> <mrow> <mn>1</mn> <mo>+</mo> <msub> <mi>&amp;alpha;</mi> <mn>1</mn> </msub> <mi>r</mi> </mrow> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>15</mn> <mo>)</mo> </mrow> </mrow>
a1For least-squares estimation value, R2For the equivalent resistance of soil between downstream line and anode bed, R2(t) it is model parameter, Wherein, E is the equivalent potential of cathode protection device, and r is the equivalent internal resistance of cathode protection device, and R is the coating equivalent electric of pipeline Resistance, A10For hook line cable current on the left of cathode protection device, V0For the output voltage of cathode protection device, A10(k)、V0(k) it is The observation at kth moment;And the GIC electricity of each position at cathodic protection station is calculated using formula (20), (22) and (23) The instantaneous value of stream is simultaneously solved, hook line cable GIC current instantaneous values I on the left of cathode protection deviceGIC(t)
IGIC(t)=A11(t)-A10(t) (20)
Cathode protection device negative electrode GIC current instantaneous value Δs IGIC(t)
ΔIGIC(t)=A01(t)-A00(t) (22)
GIC current instantaneous values I ' on the right side of cathode protection device cathode weld pointGIC(t)
I′GIC(t)=A00(t)-A01(t)+A11(t)-A10(t) (23),
Wherein, A00(t) cathode protection device electric current when being no geomagnetic storm, A01(t) be gather pipeline cathode protection device the moon Electrode current, A10(t) it is hook line cable current on the left of cathode protection device, A11(t) it is cathode protection device left current;
It can be seen from the GIC measuring method calculating process of buried oil-gas pipeline and cathode protection device, measurement signal has four, bag Include:Pipe to soil potential PSP values V1, pipeline hook line current A1, cathode protection device cathode current A0, cathode protection device output Voltage V;
Pipe to soil potential PSP values V1, pipeline hook line current A1, cathode protection device cathode current A0, cathode protection device output This four tunnels measurement signal of voltage V is separately input to pci data analog input card after the arrangement and isolation of signal conditioning circuit Each acquisition channel carries out signal acquisition, and the observation interface of industrial computer shows and be locally stored in real time data, and data pass through communication Module transfer to GIC security evaluations center is analyzed and processed.
4. the GIC measurement apparatus of buried oil-gas pipeline and cathode protection device as claimed in claim 3, it is characterised in that:Institute State sensor with signal conditioning circuit to be connected, the sensor includes Hall voltage sensor and Hall current sensor, suddenly Your voltage sensor and Hall current sensor are Closed Loop Hall.
5. the GIC measurement apparatus of buried oil-gas pipeline and cathode protection device as claimed in claim 3, it is characterised in that:Institute State signal conditioning circuit with Hall voltage sensor, Hall current sensor and pci data analog input card to be connected, for gathering Amplification, filtering, isolation and the transmission of signal.
6. the GIC measurement apparatus of buried oil-gas pipeline and cathode protection device as claimed in claim 3, it is characterised in that:Institute State pci data analog input card with signal conditioning circuit and industrial computer to be connected, for data acquisition and control.
7. the GIC measurement apparatus of buried oil-gas pipeline and cathode protection device as claimed in claim 3, it is characterised in that:Institute State GPS time service modules with industrial computer to be connected, the time synchronized for realizing equipment.
8. the GIC measurement apparatus of buried oil-gas pipeline and cathode protection device as claimed in claim 3, it is characterised in that:Institute State industrial computer with pci data analog input card, GPS time service modules and communication module to be connected, for data display and storage.
9. the GIC measurement apparatus of buried oil-gas pipeline and cathode protection device as claimed in claim 3, it is characterised in that:Institute State communication module with GIC security evaluations center to be connected, the long-distance transmissions for realizing data.
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