CN108518204A - A kind of gap gas lift liquid drainage gas production control method and system - Google Patents
A kind of gap gas lift liquid drainage gas production control method and system Download PDFInfo
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- CN108518204A CN108518204A CN201810230249.XA CN201810230249A CN108518204A CN 108518204 A CN108518204 A CN 108518204A CN 201810230249 A CN201810230249 A CN 201810230249A CN 108518204 A CN108518204 A CN 108518204A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
- E21B43/122—Gas lift
- E21B43/123—Gas lift valves
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
Abstract
The invention discloses a kind of gap gas lift liquid drainage gas production control method and systems, including：Based on oil pressure, the casing pressure variation characteristic during Wellbore of Gas Wells hydrops, using acquire in real time oil pressure, casing pressure data, automatically determine the intermittent gaslift liquid discharging gas producing gas injection opening time；Oil pressure, the casing pressure variation characteristic of well head are discharged to by gaslift based on Wellbore of Gas Wells hydrops, using acquire in real time oil pressure, casing pressure data, automatically determine intermittent gaslift liquid discharging gas producing gas injection and shut down the time；It is empirically determined existing insufficient by gas recovery teacher to solve existing gaslift intermittent time and gas injection time, realize intermittent gaslift liquid discharging gas producing manipulation automation, intelligence, it realizes that intermittent gaslift liquid discharging gas producing scene is unattended, effectively improves intermittent gaslift liquid discharging gas producing efficiency and benefit.
Description
Technical field
The present invention relates to exploitation of oil-gas field automatic fields, and in particular, to a kind of gap gas lift liquid drainage gas production controlling party
Method and system.
Background technology
Intermittent gaslift is a kind of major way of low yield natural gas well liquid discharging gas producing, injects high pressure from annular space by intermittence
Gas enters oil pipe by gas lift valve or oil pipe foot, thus by pit shaft institute hydrops body (generally condensate or water flooding)
It is taken out of from oil pipe, and then restores gas well deliverability.Gaslift intermittent time and gas injection time are generally rule of thumb true by gas recovery teacher
Fixed, intermittent gaslift manipulation is manually completed by gas production operative employee.
Invention content
The present invention provides a kind of gap gas lift liquid drainage gas production control method and systems, when solving existing gaslift interval
Between and gas injection time by gas recovery teacher it is empirically determined caused by it is insufficient, realize that the manipulation of intermittent gaslift liquid discharging gas producing is automatic
Change, is intelligent, realizing that intermittent gaslift liquid discharging gas producing scene is unattended, effectively improve intermittent gaslift liquid discharging gas producing efficiency and effect
Benefit.
Present invention is primarily based on tubing pressure during Wellbore of Gas Wells hydrops and gas lift liquid drainage and casing pressure variation characteristics
Rule, it is proposed that a kind of intermittent gaslift liquid discharging gas producing intelligent optimization algorithm, and then devise a set of intermittent gaslift liquid discharging gas producing intelligence
It can control device system.With the application of the invention, intermittent gaslift liquid discharging gas producing manipulation automation, intelligent, realization interval may be implemented
Gas lift liquid drainage gas production scene is unattended, effectively improves intermittent gaslift liquid discharging gas producing efficiency and benefit.
When gas well gas production is less than entrained liquid threshold, liquid will slip aggregation from air-flow, and gradually be converged to shaft bottom
Poly-, the averag density of oily tube fluid will be stepped up, and when shaft bottom, hydrops is gathered to a certain extent, hydrops will to annular carrying,
Oil jacket annulus liquid level is caused to increase.Three ranks generally are divided by hydrops process to the influence degree of gas well yield according to wellbore effusion
Section：Slight hydrops, moderate hydrops, severe hydrops.In the slight hydrops stage, refer to wellbore effusion and occur over just in oil pipe, there are no
Shaft bottom forms a large amount of aggregations, and there are no hydrops for oil jacket annular space, at this point, gas well yield is barely affected, shaft bottom production stream pressure dimension
It is fixed to keep steady, and casing pressure maintains to stablize, and oil pressure gradually declines, and oil jacket pressure difference gradually increases；Moderate hydrops stage, wellbore effusion have been opened
Beginning largely assembles in shaft bottom, and oil jacket annular space gradually begins with hydrops, but without stable liquid level, at this point, gas well yield starts
Decline, production stream pressure in shaft bottom is begun to decline, and casing pressure gradually declines with oil pressure, and oil jacket pressure difference is basicly stable certain fluctuation；Severe
Hydrops stage, oil jacket annulus liquid level rise, and yield, which declines, to be accelerated, and tubing pressure, set pressure pressure decline and accelerate, and finally result in gas well
It stops production.Therefore, gas lift liquid drainage Best Times in gap are preferable in slight hydrops later stage and moderate hydrops early stage, on the one hand, can
To prevent wellbore effusion from influencing gas well yield；On the other hand, gas lift liquid drainage efficiency can be improved.
Gas lift liquid drainage refers to by injecting high pressure gas to annular space, enters oil pipe by oil pipe foot or gas lift valve, pass through raising
Oil pipe interior air-flow speed takes the liquid in pit shaft to ground out of, meanwhile, the higher well section of liquid holdup on the spot can also be reduced
Liquid holdup, and then reduce fluid column static pressure.During gas lift liquid drainage, as wellbore effusion is gradually discharged to ground, oil pipe
Interior average fluid density will gradually reduce, according to U-tube principle, in the case where gas injection pressure remains unchanged, tubing pressure
It will be stepped up；After wellbore effusion is completely exhausted out pit shaft, since pit shaft is without hydrops, the average fluid density base in oil pipe
Originally it remains unchanged, according to U-tube principle, in the case where gas injection pressure keeps stablizing, tubing pressure will keep stablizing.Therefore,
Gas lift liquid drainage dwell time can be to avoid invalid gas injection when should be wellbore effusion and being completely exhausted out pit shaft.
1, the required real-time data collection of intermittent gaslift liquid discharging gas producing intelligent control includes mainly：Well mouth oil pipe pressure
(abbreviation oil pressure), oil pipe temperature, casing pressure (abbreviation casing pressure), bushing temperature, oil pipe produced gas Inlet pressure (abbreviation back pressure),
Casing injection gas comes pressure (abbreviation gas injection pipeline pressure), pneumatic diaphragm control valve open state detection (control injection high pressure gas
Body switchs).Wherein oil pressure, casing pressure, pneumatic diaphragm control valve open state are automatically controlled for real-time intelligent, and other data are used for
Gas recovery well production monitoring.The pneumatic diaphragm control valve open state testing requirements response time is not less than 1 millisecond, other parameters detection
Time interval is not less than 5 seconds.
2, intermittent gaslift liquid discharging gas producing gas injection opening time intelligent optimization algorithm, such as Fig. 1.In the gas injection down periods, gas well
Blowing band liquid produces, since gas well gas production is less than pit shaft entrained liquid threshold, wellbore effusion process：(1) the oil pipe hydrops stage,
Wellbore effusion is constantly assembled in oil pipe, at this time production stream pressure, casing pressure it is basicly stable, gas well yield by keep stablize, oil pressure with
It is more and more and be gradually reduced hydrops in oil pipe, the pressure difference of casing pressure and oil pressure is gradually increased.(2) the shaft bottom hydrops stage, with
The continuous intensification of wellbore effusion, wellbore bottom will gradually form stable hydrops, at this point, production stream pressure will be stepped up, casing pressure by
Step declines, and gas well yield is begun to decline, and oil pressure continues to decline, the pressure difference kept stable of casing pressure and oil pressure.(3) annular space hydrops
In the stage, with the further intensification of wellbore effusion, shaft bottom is stablized hydrops liquid level and is constantly risen, and pin top oil jacket ring is stepped into
Sky, this stage gas well yield is by rapid decrease or even stop-spraying.Casing pressure, oil pressure gradually decline, and the pressure difference of casing pressure and oil pressure is protected substantially
It is fixed to keep steady.The best time that intermittent gaslift liquid discharging gas producing gas injection is opened stablizes the first of hydrops between oil pipe hydrops latter stage to shaft bottom
Phase.Based on the oil pressure during Wellbore of Gas Wells hydrops, casing pressure changing rule feature, using acquire in real time oil pressure, casing pressure data,
The intermittent gaslift liquid discharging gas producing gas injection opening time is automatically determined by the intelligent optimization algorithm of intelligent controller.Specific algorithm is such as
Under：
1) calibration is given with production production Q in gas wellgUnder the conditions of, the reasonable pressure value P of casing pressure when no shaft bottom hydropsc.Calibration side
There are two types of methods, and (1) one is, after gas lift liquid drainage between the blowing time started section average casing pressure value, the time started, segment length generally took 0.5
~1 hour.(2) it second is that, is calculated by Wellbore Flow simulation, rational proration QgWhen correspond to production stream pressure PwfSubtract casing sky
Air column pressure Pcgs。
2) there is the permitted maximum casing pressure drop value Δ P of certain hydrops in calibration shaft bottomzcmax, scaling method is：(1) first
First, calibration allows minimum gas production Qgmin, generally take with production gas production Qg70~90%,.(2) then, pass through thermally coupled flow
The corresponding minimum gas production Q of permission is calculated in IPR modelgminCorresponding production stream Pwfmax.(3) finally, maximum set drop of pressure
It is worth Δ PzcmaxEqual to casing hydrops section head of liquid PclsSubtract (Pwfmax-Pwf)。
3) the permitted maximum value Δ P of oil jacket pressure difference during the production of calibration blowing hydropszctmax, embody gap gaslift
Liquid discharging gas producing hydrops severity allowed, oil jacket pressure difference is bigger, and hydrops is more serious in oil pipe.
4) casing pressure with oil pressure difference DELTA P of calibration blowing hydrops production phasezct(t) variation tendency.In oil pipe hydrops rank
Section, casing pressure are gradually increased with the variation of oil pressure difference, and after initially forming stable hydrops to shaft bottom, casing pressure tends to be steady with oil pressure difference
It is fixed.For the data monitored in real time with oil pressure due to casing pressure due to various because that will cause to fluctuate, pressure difference also will be fluctuation.In order to disappear
Except the tendency judgement error that the numerical fluctuations of real time monitoring are brought, the difference DELTA P of obtained casing pressure and oil pressure will be detected in real timezct
(t) time series rolling average processing is carried out.The sampling period of Real-time Monitoring Data is set as T, n times of T is moved for unit
Dynamic average computation, n can distinguish 5 or 10 or 20.Tendency judgement is carried out by linear fit, if slope KznIt is increasing, is showing to change
Comparatively fast；Slope tends to 0, shows to tend towards stability.5) the calibration blowing hydrops production phase continues minimum Tzmin, maximum time Tzmax.Root
T is determined according to the comprehensive analysis to gas well items Testing indexzmin、Tzmax。
6) from being sprayed onto certainly, the judgement of gas injection opening time is accurate to survey intermittent gaslift liquid discharging gas producing：Terminated as starting point with last time gaslift,
Current time casing pressure drop value Δ P is calculated separately based on real-time collected oil pressure, casing pressure valuezc(t)；Oil jacket pressure difference Δ Pzct
(t)；Time series oil jacket pressure difference rolling average changes slope kzn(t)；Blowing duration Tz(t)；Following three criterions are any
When one establishment, then start gas lift liquid drainage automatically：
(1) if T (t)>Tzmax, show that the blowing hydrops production time is more than and demarcate allowed maximum duration, need to open at this time
Dynamic gas lift liquid drainage；
(2) if Δ Pzc(t)>ΔPzcmax, and Tz(t)>Tzmin, show that blowing hydrops causes oil jacket pressure difference to be more than calibration and permits
Perhaps maximum value then needs to start gas lift liquid drainage；
(3) if kzn(t)>kzmax, and Tz(t)>Tzmin, oil jacket pressure difference change rate be significantly greater than demarcate permitted maximum value,
It then needs to start gas lift liquid drainage；
3, time intelligence optimization algorithm, such as Fig. 2 are shut down in the gas injection of intermittent gaslift liquid discharging gas producing.Gas lift liquid drainage process, first, note
Enter high pressure gas to replace the hydrops of oil jacket annular space into oil pipe by pin (or gas lift valve), oil jacket pressure difference gradually increases at this time
Greatly；Then, the hydrops in oil pipe is replaced to well head and is discharged by injection high pressure gas, and oil jacket pressure difference keeps stablizing at this time；After again, with
It the liquid in oil pipe and pit shaft is gradually discharged, oily liquid in pipe is fewer and fewer, and oil jacket pressure difference gradually decreases；Finally, with hydrops
All discharge pit shafts, oil jacket pressure difference keep stablizing.The oil pressure of well head is discharged to by gaslift based on Wellbore of Gas Wells hydrops, casing pressure changes
Law characteristic, using acquire in real time oil pressure, casing pressure data, by the intelligent optimization algorithm of intelligent controller automatically determine interval
The time is shut down in gas lift liquid drainage gas production gas injection.Specific algorithm is as follows：
1) calibration gas lift liquid drainage enumerates the minimum oil jacket pressure difference Δ P of wellbore effusion completelyglctmin.The value can pass through gas
Wellbore Flow simulation calculating is lifted to acquire, according to U-tube principle, in the case where pit shaft does not have hydrops, oil jacket pressure difference Δ Pctmin
Equal to the air column pressure P in annular spacecgs+ annular air injection frictional resistance Pcfg+ pin gas lift valve (if having) chock pressure difference PctpGas in+oil pipe
Body frictional resistance PtgsAir column pressure P in oil pipetfg。
2) casing pressure and oil pressure difference DELTA P during calibration gas lift liquid drainageglct(t) variation tendency.In order to eliminate real time monitoring
The tendency judgement error that numerical fluctuations are brought will detect the difference DELTA P of obtained casing pressure and oil pressure in real timeglct(t) time is carried out
Sequence rolling average is handled.The sampling period of Real-time Monitoring Data is set as T, n times of T carries out rolling average calculating for unit,
n3Can value be generally 5,10 or 20.Tendency judgement, k are carried out by linear fitglnSlope is to bear then to be judged to reducing；If kgln
It is approximately 0, then is judged to stablizing.
3) calibration gas lift liquid drainage gas production minimum, maximum gas injection duration.According to the synthesis to gas well items Testing index
Analysis determines gas lift liquid drainage gas production minimum, maximum allowable gas injection duration Tglmin、Tglmax。
4) judgement of intermittent gaslift liquid discharging gas producing gas injection duration is accurate surveys：Using this gaslift opening point as starting point, based on real
When collected oil pressure, casing pressure value calculate separately current time oil jacket pressure difference Δ Pglct(t)；Time series oil jacket pressure difference moves
Mean change slope kgln(t)；Gaslift duration Tgl(t)；Any one establishment of following three criterions, then need to be automatically closed
Gas lift liquid drainage, gas well are switched to the blowing production phase：
(1) if, Tgl(t)>Tglmax, the gas lift liquid drainage time, which is more than, demarcates permitted maximum time, shows that gas lift liquid drainage is complete
At, need at this time close gas lift liquid drainage, automatically switch to the blowing production phase；
(2) if, Pglct(t)<ΔPglctmin, and Tgl(t)>Tglmin, oil jacket pressure difference, which drops to, demarcates institute's permissible value, shows gaslift
Drain is completed, and is needed to close gas lift liquid drainage at this time, is automatically switched to the blowing production phase.
(3) if, kgln(t)<kglmin, and Tgl(t)>Tglmin, oil jacket pressure difference change rate tends to be steady, and shows that gas lift liquid drainage is complete
At, need at this time close gas lift liquid drainage, automatically switch to the blowing production phase；
4, gas lift liquid drainage intelligence control system in gap forms, such as Fig. 3, (1) real-time detection senses unit：By tubing pressure,
Casing pressure sensor is constituted；(2) automatic execution unit：It is made of controllable diaphragm control valve and its attachment, it is general to choose pneumatically
Diaphragm control valve, control air source directly take gas from proof wellhead oil casing annular space by acquiring connector, pass through pressure reducing valve, filter, electricity
After magnet valve open and close power gas is provided to pneumatic diaphragm control valve.Intelligent controller to solenoid valve by exporting control signal.(3)
Intelligent controller, is the core cell of gap gas lift liquid drainage gas production, and inside has real-time data collection interface, automatic executive device to connect
Mouthful, live control panel interface, data remote interface, intelligent optimization calculator and the resistance of other attachmentes at.(4) live operation control surface
Plate, the system of offer are shown and manipulation data input；(5) power-supply system, be intelligent controller, detecting sensor, automatic executive device,
Live control panel provides power supply.
One or more technical solution provided by the present application, has at least the following technical effects or advantages：
Realize intermittent gaslift liquid discharging gas producing manipulation automation, intelligent, the unmanned value in realization intermittent gaslift liquid discharging gas producing scene
It keeps, effectively improves intermittent gaslift liquid discharging gas producing efficiency and benefit.
Description of the drawings
Attached drawing described herein is used for providing further understanding the embodiment of the present invention, constitutes one of the application
Point, do not constitute the restriction to the embodiment of the present invention；
Fig. 1 is that intermittent gaslift liquid discharging gas producing well blowing hydrops production phase intelligent control operation principle is illustrated in the application
Figure；
Fig. 2 is that intermittent gaslift liquid discharging gas producing well gas lift liquid drainage production phase intelligent control operation principle is illustrated in the application
Figure；
Fig. 3 is intermittent gaslift liquid discharging gas producing well Structure of intelligent control system schematic diagram in the application.
Specific implementation mode
Intermittent gaslift is a kind of major way of low yield natural gas well liquid discharging gas producing, injects high pressure from annular space by intermittence
Gas enters oil pipe by gas lift valve or oil pipe foot, thus by pit shaft institute hydrops body (generally condensate or water flooding)
It is taken out of from oil pipe, and then restores gas well deliverability.Current gaslift intermittent time and gas injection time are generally by gas recovery teacher according to warp
Determination is tested, intermittent gaslift manipulation is manually completed by gas production operative employee.Present invention is primarily based on Wellbore of Gas Wells hydrops and gas lift liquid drainages
Tubing pressure and casing pressure variation characteristic rule in the process, it is proposed that a kind of intermittent gaslift liquid discharging gas producing intelligent optimization method,
And then devise a set of intermittent gaslift liquid discharging gas producing intelligent control device system.With the application of the invention, intermittent gaslift row may be implemented
Liquid gas production manipulation automation, intelligence, realize that intermittent gaslift liquid discharging gas producing scene is unattended, effectively improve intermittent gaslift drain
Gas production efficiency and benefit.
To better understand the objects, features and advantages of the present invention, below in conjunction with the accompanying drawings and specific real
Mode is applied the present invention is further described in detail.It should be noted that in the case where not conflicting mutually, the application's
Feature in embodiment and embodiment can be combined with each other.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still, the present invention may be used also
Implemented with being different from the other modes being described herein in range using other, therefore, protection scope of the present invention is not by under
The limitation of specific embodiment disclosed in face.
The present invention is based on collect oil pressure, casing pressure data in real time, it is proposed that a set of intelligent decision intermittent gaslift liquid discharging gas producing
Hydrops degree algorithm during well blowing, which is embedded into intelligent controller, you can realizes intermittent gaslift liquid discharging gas producing intelligence
It can, automatically turn on gas lift liquid drainage control.Using the algorithm, gas well self-energy can be applied to carry out hydrops production to greatest extent,
It can reach and be required with production, moreover it is possible to injected gas volume is reduced, to improve intermittent gaslift liquid discharging gas producing efficiency and benefit.
Hydrops deciding degree method one proposed by the present invention, be utilized wellbore effusion the oil pressure of different phase, casing pressure it
Between difference changing character, using time scale rolling average slope computational methods carry out intelligent decision, reality can be eliminated
When monitoring fluctuation uncertain influenced on what tendency judgement was brought.The difference DELTA P of obtained casing pressure and oil pressure will be detected in real timezct
(t) time series rolling average processing is carried out.The sampling period of Real-time Monitoring Data is set as T, n times of T is moved for unit
Dynamic average computation, n desirable 5,10 or 20, concrete condition rule of thumb determines.Tendency judgement is carried out by linear fit, if quasi-
Close slope KznIt is larger, it is determined as that variation is apparent；If close to 0, it is judged to stablizing.
Hydrops deciding degree method two proposed by the present invention, judgement Δ is carried out using maximum difference between oil pressure and casing pressure
Pzctmax.Oil jacket allows maximum differential pressure to be obtained to gas well plug-ging production process tracking comprehensive analysis by gas recovery teacher.If Pzct(t)
>ΔPzctmax, then show that hydrops is serious, needs gas lift liquid drainage.
Hydrops deciding degree method three proposed by the present invention, is judged using wellbore effusion stage casing pressure drop value.
It is calculated by the flow simulating in the gas well plug-ging production process of backstage, incorporates experience into estimation, obtain gas well blowing hydrops production
Permitted maximum casing pressure drop value Δ P in the processzcmax.It calculates first, in no hydrops rational proration QgCorresponding set
Pressure value Pc1.Then it calculates, the hydrops of permission produces minimum gas production QgminWhen (generally take with production gas production Qg70~90%,
It is specific value, empirically determined) corresponding to and Pc2.Maximum casing pressure drop value Δ Pzcmax=Pc1-Pc2.If Δ Pzc(t)>Δ
Pcmax, then show that hydrops is serious, needs gas lift liquid drainage.
Hydrops deciding degree method four proposed by the present invention is analyzed by gas recovery teacher according to the historical trace to gas well
It arrives, permitted minimum, the largest production time T of hydrops productionzmin、Tzmax.If Tz(t)<Tzmin, show that gas well plug-ging is not serious；
Tz(t)>Tzmax, show that gas well plug-ging is serious.
The present invention proposes intermittent gaslift liquid discharging gas producing, and from being sprayed onto certainly, the judgement of gas injection opening time is accurate to survey：With last time gaslift knot
Beam is starting point, and current time casing pressure drop value Δ P is calculated separately based on real-time collected oil pressure, casing pressure valuezc(t)；Oil jacket pressure
Difference DELTA Pzct(t)；Time series oil jacket pressure difference rolling average changes slope kzn(t)；Blowing duration Tz(t)；It is following three
When any one establishment of criterion, then start gas lift liquid drainage automatically：
(1) if T (t)>Tzmax, show that the blowing hydrops production time is more than and demarcate allowed maximum duration, need to open at this time
Dynamic gas lift liquid drainage；
(2) if Δ Pzc(t)>ΔPzcmax, and Tz(t)>Tzmin, show that blowing hydrops causes oil jacket pressure difference to be more than calibration and permits
Perhaps maximum value then needs to start gas lift liquid drainage；
(3) if kzn(t)>kzmax, and Tz(t)>Tzmin, oil jacket pressure difference change rate be significantly greater than demarcate permitted maximum value,
It then needs to start gas lift liquid drainage；
The present invention is based on collect oil pressure, casing pressure data in real time, it is proposed that a set of intelligent decision intermittent gaslift liquid discharging gas producing
Well gas lift liquid drainage Method Of Accomplishment, this method is embedded into intelligent controller, you can realizes intermittent gaslift liquid discharging gas producing intelligently, certainly
It is dynamic to close lift-gas injection control.Using the algorithm, it can be precisely controlled gas injection time, injected gas volume is avoided to waste, to improve
Intermittent gaslift liquid discharging gas producing efficiency and benefit.
Gas lift liquid drainage proposed by the present invention completes determination method one, and oil pressure, set of the pit shaft drain in different phase is utilized
Difference changing character between pressure carries out intelligent decision using different time scales rolling average slope computational methods, can
The uncertainty that tendency judgement is brought is influenced with eliminating monitoring fluctuation in real time.The difference of obtained casing pressure and oil pressure will be detected in real time
It is worth Δ Pglct(t) time series rolling average processing is carried out.The sampling period of Real-time Monitoring Data is set as T, n times of T is single
Position carries out rolling average calculating, and n desirable 5,10 or 20, concrete condition rule of thumb determines.Trend is carried out by linear fit
Judgement, if fit slope kglnIt is larger, then it is determined as that variation is apparent；If kglnIt levels off to 0, is then judged to stablizing.
Gas lift liquid drainage proposed by the present invention completes determination method two, is judged using minimal difference between oil pressure and casing pressure
ΔPglctmin.Oil jacket allows minimum differntial pressure to be obtained to gas well drain production process tracking comprehensive analysis by gas recovery teacher.If Pglct
(t)<ΔPglctmin, then show that hydrops is drained, can switch to the production of blowing hydrops.
Gas lift liquid drainage proposed by the present invention completes determination method three, is gone through according to gas well gas lift liquid drainage by gas recovery teacher
History trace analysis obtains, gas lift liquid drainage gas production minimum, maximum allowable gas injection duration Tglmin、Tglmax.If Tgl(t)<Tglmin,
Show that gas lift liquid drainage does not complete；Tgl(t)>Tglmax, show that gas well gas lift liquid drainage has been completed.
The present invention proposes the quasi- survey of intermittent gaslift liquid discharging gas producing gas injection duration judgement：It is with this gaslift opening point
Point calculates separately current time oil jacket pressure difference Δ P based on real-time collected oil pressure, casing pressure valueglct(t)；Time series oil
It covers pressure difference rolling average and changes slope kgln(t)；Gaslift duration Tgl(t)；Any one establishment of following three criterions, then need
Gas lift liquid drainage is automatically closed, gas well is switched to the blowing production phase：
(1) if, Tgl(t)>Tglmax, the gas lift liquid drainage time, which is more than, demarcates permitted maximum time, shows that gas lift liquid drainage is complete
At, need at this time close gas lift liquid drainage, automatically switch to the blowing production phase；
(2) if, Pglct(t)<ΔPglctmin, and Tgl(t)>Tglmin, oil jacket pressure difference, which drops to, demarcates institute's permissible value, shows gaslift
Drain is completed, and is needed to close gas lift liquid drainage at this time, is automatically switched to the blowing production phase.
(3) if, kgln(t)<kglmin, and Tgl(t)>Tglmin, oil jacket pressure difference change rate tends to be steady, and shows that gas lift liquid drainage is complete
At, need at this time close gas lift liquid drainage, automatically switch to the blowing production phase；
The present invention is based on the production of blowing hydrops, the gas lift liquid drainage productions during intermittent gaslift liquid discharging gas producing set forth above
Stage hydrops and drain intelligent decision algorithm, it is proposed that a set of enforceable intermittent gaslift liquid discharging gas producing intelligence control system dress
It sets, which is made of 7 parts：
1 real-time detection senses unit：In addition to intelligent control other than tubing pressure necessarily, casing pressure on-line checking,
In order to realize to gas well liquid loading situation overall monitor, it is also necessary to increase gas injection system pressure and temperature, surface production pipeline back pressure
With temperature, the parameters on-line real-time measuremen such as gas injection rate metering, the metering of production tolerance, production liquid (oil, water) metering,.
2 automatic execution units：It is made of controllable diaphragm control valve and its attachment, generally chooses pneumatic diaphragm control valve,
Control air source directly takes gas by acquiring connector from proof wellhead oil casing annular space, by after pressure reducing valve, filter, solenoid valve to pneumatic thin
Film control valve provides power gas source.Intelligent controller to solenoid valve by exporting control signal.
3 intelligent controllers, are the core cells of gap gas lift liquid drainage gas production, and there is real-time data collection interface, automatic in inside
Actuator interface, live control panel interface, data remote interface, intelligent optimization calculator and the resistance of other attachmentes at.
4 live control panels, the system of offer are shown and manipulation data input；
5 data remote communication modules realize that on-line monitoring and control information uploads, long-range model parameter and operating parameter are returned
It passes, communication modes can be wireless GPRS, WIFI or wired optical cable, connection etc..
6 remote monitoring systems monitor intermittent gaslift liquid discharging gas producing production status, and intelligent control model parameter inputs, remotely
Manipulate data input；
7 power-supply systems are intelligent controller, detecting sensor, automatic executive device, data remote communication module, scene behaviour
It controls the field devices such as panel and power supply is provided, power source can be ground electrical power line, accumulator, solar energy etc..
What the part in the application met is described as follows：
Qg, calibration gives in gas well matches production yield, m3/d；Pc, the reasonable pressure value of casing pressure when no shaft bottom hydrops, MPa；Δ
Pzcmax, there are the permitted maximum casing pressure drop value of certain hydrops, MPa in calibration shaft bottom；ΔPzctmax, demarcate blowing drain production period
Between the permitted maximum value of oil jacket pressure difference, MPa；ΔPzc(t), oil jacket pressure difference monitor value during blowing drain production, MPa；kzn
(t), the Fitting Calculation obtains oil jacket pressure differential deltap P during blowing drain productionzc(t) rolling average variation tendency slope, MPa/d；
kzmax, demarcate oil jacket pressure difference rolling average variation slope boundary value during blowing, MPa/d；Tzmin、Tzmax, demarcate blowing and continue most
Short, maximum duration, d；ΔPglct(t), oil jacket pressure difference monitor value, MPa during gas lift liquid drainage；ΔPglctmin, it is complete to demarcate gas lift liquid drainage
Enumerate the minimum oil jacket pressure difference after wellbore effusion, MPa entirely；kgln(t), the rolling average of oil jacket pressure difference changes during gas lift liquid drainage
Trend slope, MPa/d；kglmin, oil jacket pressure difference rolling average variation tendency slope minimum defines value during demarcating gas lift liquid drainage,
MPa/d；Tglmin、Tglmax, calibration gas lift liquid drainage gas production minimum allowable gas injection duration minimum, maximum value, d；Pwf, rationally match
Produce QgWhen correspond to production stream pressure, MPa；Pcgs, rational proration QgWhen correspond to casing air column pressure, MPa；Qgmin, calibration permission is most
Low yield tolerance, m3/d；Pwfmax, allow the production stream pressure corresponding to minimum gas production；Pcls, allow casing hydrops head of liquid,
MPa；Pcfg, annular air injection frictional resistance when gaslift, MPa；Pctp, pin gas lift valve chock pressure difference when gaslift, MPa；Ptgs, oil when gaslift
Gas frictional resistance, MPa in pipe；Ptfg, air column pressure in oil pipe when gaslift.
Intermittent gaslift liquid discharging gas producing Structure of intelligent control system proposed by the invention and principle as shown in Figure 1, Figure 2, Fig. 3
In the blowing hydrops production phase, oil pressure, casing pressure are persistently monitored, it is automatic to calculate based on the model parameter that backstage provides
Blowing hydrops critical parameter is surveyed, intelligence using intermittent gaslift liquid discharging gas producing gas injection opening time comprehensive judgement standard proposed by the present invention
It is capable of determining whether to need to be switched to the gas lift liquid drainage production phase, if then exporting gas lift liquid drainage open command, be beaten by solenoid valve
Pneumatic diaphragm control valve is opened to realize that gas lift liquid drainage produces, otherwise continues to the production of blowing hydrops.
In the gas lift liquid drainage production phase, oil pressure, casing pressure are persistently monitored, it is automatic to calculate based on the model parameter that backstage provides
Gas lift liquid drainage completes critical parameter, judges quasi- survey, intelligence using the intermittent gaslift liquid discharging gas producing gas injection duration proposed by the present invention
It is capable of determining whether that needing to be switched to the blowing hydrops production phase is closed if then exporting gas lift liquid drainage out code by solenoid valve
Pneumatic diaphragm control valve is closed to realize that gaslift is closed, otherwise continues to gas lift liquid drainage production.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
God and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (11)
1. a kind of gap gas lift liquid drainage gas production control method, which is characterized in that the method includes：
Based on oil pressure, the casing pressure variation characteristic during Wellbore of Gas Wells hydrops, using acquire in real time oil pressure, casing pressure data, from
The dynamic opening time for determining intermittent gaslift liquid discharging gas producing gas injection；
Oil pressure, the casing pressure variation characteristic of well head are discharged to by gaslift based on Wellbore of Gas Wells hydrops, using oil pressure, the set acquired in real time
Data are pressed, the production time that intermittent gaslift liquid discharging gas producing gas injection closure, suspension, merger and conversion is blowing is automatically determined.
2. gas lift liquid drainage gas production control method in gap according to claim 1, which is characterized in that automatically determine intermittent gaslift
It the opening time of liquid discharging gas producing gas injection, specifically includes：
Calibration is given with production production Q in gas wellgUnder the conditions of, the reasonable pressure value P of casing pressure when no shaft bottom hydropsc；Calibration shaft bottom has one
The permitted maximum casing pressure drop value Δ P of constant volume liquidzcmax；Demarcate the permitted maximum value Δ P of oil jacket pressure differencezctmax；Using movement
The method of average calculates, oil jacket pressure differential deltap Pzc(t) variation tendency slope kzn(t), calibration hydrops allows to change slope boundary value kzmax；
Calibration gas lift liquid drainage gas production blowing continues shortest time Tzmin, maximum duration Tzmax；
From being sprayed onto certainly, the judgement of gas injection opening time is accurate to survey intermittent gaslift liquid discharging gas producing：Terminated as starting point with last time gaslift, based on real
When collected oil pressure, casing pressure value calculate separately current time casing pressure drop value Δ Pzc(t)；Oil jacket pressure difference Δ Pzct(t)；When
Between sequence oil jacket pressure difference rolling average change slope kzn(t)；Blowing duration Tz(t)；Following three criterions any one at
Immediately, then start gas lift liquid drainage automatically：
If 1) T (t)>Tzmax, show that the blowing hydrops production time is more than and demarcate allowed maximum duration, need to start gaslift at this time
Drain；
If 2) Δ Pzc(t)>ΔPzcmax, and Tz(t)>Tzmin, it is permitted to show that blowing hydrops causes oil jacket pressure difference to be more than calibration
Maximum value then needs to start gas lift liquid drainage；
If 3) kzn(t)>kzmax, and Tz(t)>Tzmin, oil jacket pressure difference change rate, which is more than, demarcates permitted maximum value, then needs to open
Dynamic gas lift liquid drainage.
3. gas lift liquid drainage gas production control method in gap according to claim 1, which is characterized in that automatically determine intermittent gaslift
Liquid discharging gas producing gas injection closure, suspension, merger and conversion is the production time of blowing, is specifically included：
Calibration gas lift liquid drainage enumerates the minimum oil jacket pressure difference Δ P after wellbore effusion completelyglctmin；It is calculated using the method for moving average,
Casing pressure and oil pressure difference DELTA Pglct(t) variation tendency kgln(t), calibration gas lift liquid drainage enumerates the oil jacket pressure after wellbore effusion completely
Poor minimum change slope kglmin；Demarcate gas lift liquid drainage gas production minimum allowable gas injection duration Tglmin, maximum time Tglmax；
The judgement of intermittent gaslift liquid discharging gas producing gas injection duration is accurate to survey：Using this gaslift opening point as starting point, based on acquisition in real time
To oil pressure, casing pressure value calculate separately current time oil jacket pressure difference Δ Pglct(t)；Time series oil jacket pressure difference rolling average becomes
Change slope kgln(t)；Gaslift duration Tgl(t)；Any one establishment of following three criterions then needs that gaslift row is automatically closed
Liquid, gas well are switched to the blowing production phase：
If 1), Tgl(t)>Tglmax, the gas lift liquid drainage time, which is more than, demarcates permitted maximum time, shows that gas lift liquid drainage is completed, this
When need close gas lift liquid drainage, automatically switch to the blowing production phase；
If 2), Pglct(t)<ΔPglctmin, and Tgl(t)>Tglmin, oil jacket pressure difference, which drops to, demarcates institute's permissible value, shows gas lift liquid drainage
It completes, needs to close gas lift liquid drainage at this time, automatically switch to the blowing production phase；
If 3), kgln(t)<kglmin, and Tgl(t)>Tglmin, show that gas lift liquid drainage is completed, need to close gas lift liquid drainage at this time, automatically
It is switched to the blowing production phase.
4. gas lift liquid drainage gas production control method in gap according to claim 2, which is characterized in that calibration gives in gas well matches
Produce production QgUnder the conditions of, the reasonable pressure value P of casing pressure when no shaft bottom hydropsc, there are two types of scaling methods, the first：After gas lift liquid drainage
Between the blowing time started section average casing pressure value；Second：It is calculated by Wellbore Flow simulation, rational proration QgWhen correspond to
Production stream pressure PwfSubtract casing air column pressure Pcgs。
5. gas lift liquid drainage gas production control method in gap according to claim 2, which is characterized in that there is a constant volume in calibration shaft bottom
The permitted maximum casing pressure drop value Δ P of liquidzcmax, scaling method is：First, calibration allows minimum gas production Qgmin；Then,
The corresponding minimum gas production Q of permission is calculated by thermally coupled flow IPR modelgminCorresponding production stream presses Pwfmax；Finally, most
Big casing pressure drop value Δ PzcmaxEqual to casing hydrops section head of liquid PclsSubtract (Pwfmax-Pwf)。
6. gas lift liquid drainage gas production control method in gap according to claim 2, which is characterized in that calibration casing pressure and oil pressure are poor
It is worth Δ Pzct(t) variation tendency will detect the difference DELTA P of obtained casing pressure and oil pressure in real timezct(t) it is flat to carry out time series movement
It handles, sets the sampling period of Real-time Monitoring Data as T, n times of T carries out rolling average calculating for unit, and the value of n is 5
Or 10, tendency judgement is carried out by linear fit.
7. gas lift liquid drainage gas production control method in gap according to claim 3, which is characterized in that calibration gas lift liquid drainage is complete
Enumerate the minimum oil jacket pressure difference Δ P of wellbore effusionglctminIt is acquired by the calculating of gaslift pit shaft flow simulating, is not accumulated in pit shaft
In the case of liquid, oil jacket pressure difference Δ PctminEqual to the air column pressure P in annular spacecgs+ annular air injection frictional resistance Pcfg+ pin gas lift valve
Chock pressure difference PctpGas frictional resistance P in+oil pipetgsAir column pressure P in oil pipetfg。
8. gas lift liquid drainage gas production control method in gap according to claim 3, which is characterized in that calibration casing pressure and oil pressure are poor
It is worth Δ Pglct(t) variation tendency will detect the difference DELTA P of obtained casing pressure and oil pressure in real timeglct(t) time series movement is carried out
Average treatment sets the sampling period of Real-time Monitoring Data as T, and n times of T carries out rolling average calculating for unit, and the value of n is
5 or 10, tendency judgement is carried out by linear fit.
9. a kind of gap gas lift liquid drainage gas production control system, which is characterized in that the system comprises：
Real-time detection senses unit, including tubing pressure, casing pressure sensor, real-time detection senses unit is for acquiring gap
Gas lift liquid drainage gas production production status parameter, and the parameter is transmitted to intelligent controller, intelligent controller will be based on detection in real time
The parameter of perception carries out operation, output intelligent control instruction；
Automatic execution unit, including controllable diaphragm control valve and its attachment, automatic execution unit are used for intelligent controller institute is defeated
The gas injection that the instruction gone out is converted to gap gaslift is shut down and is automatically brought into operation, if instruction is blowing, production is switched to gas lift liquid drainage state,
Diaphragm control valve can then be crossed and open gas injection channel, to pit shaft gas injection, gas well is kept to be in gas lift liquid drainage state；If instruction is gaslift
Drain is switched to blowing production status, then by the control valve of film, closes gas injection channel, and gas well is kept to be in blowing production shape
State；
Intelligent controller, the real-time status parameter for receiving real-time detection senses unit transmission, generates manipulation instruction, and will refer to
Order sends automatic execution unit to and realizes automatic manipulation；
Live control panel is shown and manipulation data input for providing system；
Power-supply system, for being provided for intelligent controller, real-time detection senses unit, automatic execution unit, live control panel
Power supply.
10. gas lift liquid drainage gas production control system in gap according to claim 9, which is characterized in that the system also includes：
Data remote communication module uploads for realizing system on-line monitoring and control information, long-range model parameter and manipulation are joined
Number passback；
Remote monitoring system, for monitoring intermittent gaslift liquid discharging gas producing production status, the input of Controlling model parameter, remote control number
According to input.
11. gas lift liquid drainage gas production control system in gap according to claim 9, which is characterized in that
In the blowing hydrops production phase, oil pressure, casing pressure are persistently monitored, based on the model parameter that backstage provides, calculates blowing automatically
Hydrops critical parameter is surveyed using intermittent gaslift liquid discharging gas producing gas injection opening time comprehensive judgement standard, it is determined whether needs are switched to
The gas lift liquid drainage production phase, if then exporting gas lift liquid drainage open command, by solenoid valve open pneumatic diaphragm control valve to
It realizes gas lift liquid drainage production, otherwise continues to the production of blowing hydrops；
In the gas lift liquid drainage production phase, oil pressure, casing pressure are persistently monitored, based on the model parameter that backstage provides, calculates gaslift automatically
Critical parameter is completed in drain, judges accurate survey using the intermittent gaslift liquid discharging gas producing gas injection duration, it is determined whether needs are switched to
The blowing hydrops production phase, if then exporting gas lift liquid drainage out code, by solenoid valve close pneumatic diaphragm control valve to
It realizes that gaslift is closed, otherwise continues to gas lift liquid drainage production.
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