CN106762584A - Oil well interval pumping control system and method - Google Patents
Oil well interval pumping control system and method Download PDFInfo
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- CN106762584A CN106762584A CN201611229855.7A CN201611229855A CN106762584A CN 106762584 A CN106762584 A CN 106762584A CN 201611229855 A CN201611229855 A CN 201611229855A CN 106762584 A CN106762584 A CN 106762584A
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- 238000005086 pumping Methods 0.000 title claims abstract description 124
- 239000003129 oil well Substances 0.000 title claims abstract description 97
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000007788 liquid Substances 0.000 claims abstract description 42
- 238000006073 displacement reaction Methods 0.000 claims abstract description 39
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 239000012530 fluid Substances 0.000 claims description 25
- 241000196324 Embryophyta Species 0.000 claims description 20
- 241000208340 Araliaceae Species 0.000 claims description 17
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 claims description 17
- 235000003140 Panax quinquefolius Nutrition 0.000 claims description 17
- 235000008434 ginseng Nutrition 0.000 claims description 17
- 230000005611 electricity Effects 0.000 claims description 16
- 239000000523 sample Substances 0.000 claims description 12
- 238000004088 simulation Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 7
- 230000003068 static effect Effects 0.000 claims description 5
- 238000009826 distribution Methods 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 239000000446 fuel Substances 0.000 claims description 3
- 238000009738 saturating Methods 0.000 claims description 2
- 230000008595 infiltration Effects 0.000 claims 1
- 238000001764 infiltration Methods 0.000 claims 1
- 238000004080 punching Methods 0.000 claims 1
- 238000003860 storage Methods 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 230000009467 reduction Effects 0.000 abstract description 4
- 239000003921 oil Substances 0.000 description 73
- 230000007423 decrease Effects 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000010779 crude oil Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 240000002853 Nelumbo nucifera Species 0.000 description 2
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 2
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
- F04B49/065—Control using electricity and making use of computers
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/126—Adaptations of down-hole pump systems powered by drives outside the borehole, e.g. by a rotary or oscillating drive
- E21B43/127—Adaptations of walking-beam pump systems
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Abstract
The invention discloses a pumping control system and method between oil wells, which comprises a pumping unit, a controller and a motor, wherein the motor is connected with the pumping unit and used for driving the pumping unit, a rotating speed sensor and an electrical parameter acquisition module are arranged on the motor and used for acquiring the rotating speed of an output shaft of the motor and current and voltage values and sending the rotating speed and the current and voltage values to the controller, a load sensor and a displacement sensor are arranged on the pumping unit and connected with the controller and used for sending measured values of load and displacement of a pumping rod of an oil pumping well to the controller, and the controller is connected with the motor through a frequency conversion device and used for controlling the starting and stopping of the motor. The invention reasonably controls according to the actual liquid outlet condition, satisfies the production supply coordination of the oil well, utilizes the intelligent adjustment of the stroke frequency and the intelligent dynamic intermittent pumping control, thereby realizing the energy saving and consumption reduction of the oil well and reducing the loss of operating equipment, and the follow-up control satisfies the fine control of the oil well in one stroke period, further improves the operating efficiency of the oil well system and reduces the energy consumption.
Description
【Technical field】
The invention belongs to computer collecting system digitizer field, and in particular to a kind of beam pumping unit intermittent pumping control
System and method.
【Background technology】
Not enough for feed flow in low yield inefficient well, and the exploitation middle and later periods hyposmosis well, it is continuous with strata pressure
Reduce, the not enough phenomenon of well deliverability is very universal, because supply and discharge is uneven, oil pumper is chronically at inefficient operation shape
State, energy dissipation is serious, the invalid abrasion aggravation of equipment, causes economic benefit very low, occurs in that many inefficiencies, or even " negative
The mechanical oil well of benefit ", how to allow oil pumper efficiently, the work of energy-conservation, into problem demanding prompt solution.
From from the perspective of improving pump efficiency and energy-conservation, intermittent pumping working method is a kind of extremely effective mode, is overcome
Feed flow deficiency can not meet the problem of the continuous work of pumping unit, and so as to improve pump efficiency, but intermittent pumping is when needing one section
Between build-up of fluid, in the process wellbore pressure raise, the thing followed is pit shaft and the reduction of ground interlayer pressure difference and ground
The reduction of layer seepage discharge.Therefore, how making rod-pumped well can run under efficient state, while playing stratum as much as possible again
Potentiality.
Adjusted by oil well and joined, pump setting depth is such as increased, to provide larger producing pressure differential；Lengthened stroke, trickle charge number, small pump
Footpath, can improve the liquid-extracting amount of oil well, but once oil well occurs adjusting ginseng difficult, that is, when adjusting ginseng leeway less big, take out for a long time
The negative effect that oil is brought will aggravate.
【The content of the invention】
The technical problems to be solved by the invention are to be directed to above-mentioned deficiency of the prior art, there is provided a kind of beam type is taken out
Oil machine intermittent pumping control system and method, most rational control method is given according to liquid situation is actually gone out, and realizes computer collecting system
The lifting of efficiency and the target of energy consumption reduction.
The present invention uses following technical scheme：
A kind of oil well interval pumping control system, including oil pumper, controller and motor, the motor and the oil pumper
Connection, for driving the oil pumper, is provided with speed probe and electricity ginseng acquisition module on the motor, be respectively used to adopt
Collect the output rotating speed and Current Voltage value of the motor and be sent to the controller, load is provided with the oil pumper
Lotus sensor and displacement transducer, the load transducer and displacement transducer are connected with the controller respectively, for by institute
The measured value for stating pumping rod of well pumping unit load and displacement is sent to the controller, and the controller is by converter plant and institute
State motor connection, the start and stop for controlling the motor.
Further, the controller includes well head collector, and the well head collector is connected with RTU control units, uses
In the collection information of the load transducer and displacement transducer is sent into the RTU control units, the electricity ginseng gathers mould
Block is connected with the RTU control units, and for the Current Voltage value to be sent into the RTU control units, the rotating speed is passed
Sensor and the RTU control units wireless connection, the RTU control units are connected with the converter plant, for by gather
Information is sent to the converter plant.
Further, display unit and operating unit are additionally provided with the controller, the display unit and operation are single
Unit is connected with the RTU control units respectively, for display and operational control.
Further, the load transducer is arranged on well head polished rod eye, and institute's displacement sensors are arranged under walking beam
Side.
The invention also discloses a kind of oil well interval pumping control method, comprise the following steps：
S1, the installed load sensor on well head polished rod eye, install displacement transducer, Real-time Collection oil pumping below walking beam
Motor-pumped well sucker rod load and displacement information；
S2, installation speed probe and electricity ginseng acquisition module on motor, the rotating speed of synchronous acquisition motor output shaft,
Motor three-phase current and information of voltage；
S3, set up oil well output computation model, according to pumping and stop determination intermittent pumping system of finding time, by step S1 and
The information of S2 collections is sent to controller, and controller calculates the parameter information of motor and is sent to converter plant, filled by frequency conversion
Put by control electric current frequency and working time control motor running, carry out oil well interval pumping control.
Further, in step S1 and S2, constant duration measures described information group points much in a stroke cycle
In 200.
Further, in step S3, the parameter information of the motor includes that motor running and dwell time, motor turn
Speed, rotational speed omega distribution and power frequency f distributed intelligences.
Further, in step S3, characteristic curve is flowed into according to oil well, sets up the oil well output computation model as follows：
Wherein, h-Effective thickness of formation, m；re- oil well fuel feeding edge radius, m；rw- well radius, m；Ooze on k-stratum
Saturating rate, μm2；H-core intersection, m；pwf- stream pressure, MPa；pr- static reservoir pressure, MPa；P-pressure, MPa；Ko- oil phase is relative
Permeability；Bo- oil volume factor, m3/m3；μo- stratum oil viscosity, mPa.s.
Further, in step S3, during stopping taking out, the intermittent pumping system is specially：Stopping taking out cycle TSIt is interior, build
The simulation model of build-up of fluid height during stopping taking out is found, is obtained stopping stratum in the cycle of taking out and is flowed into the liquid measure of pit shaft relative to continuous
Oil pumping flows into the percentage that liquid measure is declined, and stops taking out the height after all end of term build-up of fluids, and any time liquid level is such as
Under：
Wherein：Hd0Hydrodynamic face during-continuous oil pumping, m；Ac- oil jacket annular space area of passage, m2；T-calculating moment, d；
HdThe hydrodynamic face of-moment t, m；pwfThe stream pressure of-moment t, Pa；Q(pwf)-moment t and stream pressure pwfCorresponding stratum access wall
The instantaneous delivery of cylinder, m3/d。
Further, in step S3, in oil pumping process, the intermittent pumping system is specially：In pumping cycle TPIt is interior, build
Vertical pumping cycle and the simulation model of oil well output in pumping cycle, obtain pumping cycle TP, further according to stopping taking out cycle TSAnd oil pumping
Cycle TPDetermine the average daily fluid production rate of oil well, any time liquid level is as follows：
Wherein：psThe pump intake pressure of-moment t oil well pump, Pa；Hdmin- rise and take out instantaneous minimum fluid depth, m；Qp
(ps)-moment t and pump intake pressure psCorresponding oil pumping pumpage, i.e. oil well instant productivity, m3/d。
Compared with prior art, the present invention at least has the advantages that：
A kind of oil well interval pumping control system of the present invention, motor is gathered by speed probe and electricity ginseng acquisition module respectively
Output rotating speed and Current Voltage value, load transducer and displacement transducer on oil pumper gather rod-pumped well respectively
Sucker rod load and the measured value of displacement, controller control opening for motor according to all information for collecting by converter plant
Stop, rationally controlled according to liquid situation is actually gone out, meet coordinating for product for oil well, taken out using between jig frequency adjustment and Intelligent Dynamic
Control, so as to realize the energy-saving of oil well and reduce the loss of operational outfit, servo antrol meets a stroke cycle
The Precise control of interior oil well, further improves well system operational efficiency, reducing energy consumption.
Further, controller obtains the job information of motor and oil pumper using RTU control units respectively, with logical
News distance is more long, can be used in the industry spot of various bad environments, and modular structureization design is easy to extension, using extensive
Feature.
Further, the display unit and operating unit for being set on controller are easy to regular job.
Further, it is right by the load transducer on well head polished rod eye and the displacement transducer below walking beam
Pumping rod of well pumping unit load and displacement are measured, and can gather load and time, displacement and time graph, are calculated and are obtained well
Mouth indicator card.
The invention also discloses a kind of oil well interval pumping control method, install sensor, frequency conversion dress on beam pumping unit
Put and controller, speed probe and electricity ginseng acquisition module are installed on motor, installed load and displacement are passed on oil pumper
Sensor, the data is activation that various sensors are gathered by controller computing and provides optimal control policy to controller, then will fortune
Line parameter is sent to converter plant, and converter plant is controlled to motor, finally realizes oil pump energy-saving operation control, is effectively carried
Well system operational efficiency high, reducing energy consumption.
Further, determine that every mouth oil well patrols one group of frequency of indicator card data of survey, to stripper well using 10 minutes
Frequency, and one day Effective power figure number of collection is no less than 110, constant duration measures data group points in a stroke cycle
No less than 200, according to different oil wells, by rational data acquisition, the operating efficiency of oil pumper is improved, extension uses the longevity
Life, reduces cost.
Further, conventional oil well flows into characteristic curve and is characterized as that oil well output increases with the decline of stream pressure；Pressed with stream
Increase and reduce, if oil well follow tradition flow into characteristic curve, when using intermittent pumping system when, because build-up of fluid can lead
Causing stream pressure increases, then intermittent pumping system can reduce oil well output, therefore for planar radial flowing, set up the oil of single phase fluid flow
Well production computation model, most rational control method is given according to liquid situation is actually gone out, and meets coordinating for product for oil well.
Further, stopping in the cycle of taking out, well head does not produce liquid, because well fluid level is in recovery state, therefore stream pressure
It is constantly in increase state and higher than the stream pressure of continuous oil pumping, the liquid measure for causing stratum to flow into oil jacket annular space decreases；Taking out
In the oily cycle, be pumped into fluid in oil jacket annular space in oil pipe and ground is given rise to by oil well pump, and well head produces liquid.In oil well pump pumping
While lifting crude oil, fluid is continuously flowed into oil jacket annular space in stratum.Although oil well pump pumping liquid causes liquid level gradually
Reduce, but because in oil pumping process, liquid level is still above the stream pressure of the liquid level of continuous oil pumping, i.e. stream pressure higher than continuous oil pumping,
Therefore in oil pumping process, the liquid measure that stratum flows into pit shaft also decreases, according to stopping finding time and the oil pumping time takes out interval
Oily system carries out preferably, by simulation analysis, declining boundary with reference to given allowable production rate, it is possible to it is determined that most long stop the cycle of taking out
And corresponding pumping cycle.The oil well liquid-supplying situation that obtains judged according to indicator card, automatic study, Step wise approximation oil well
Optimal interval time.
In sum, the system is coordinated shaft bottom and is supplied using control oil pumper intermittent pumping by interval pumping mode of operation
Row's balance, standard and downtime are taken out between dynamically choosing oil pumper, the method optimized with contrast, and rationally control oil pumper is opened
Stop, play oil well maximum capacity, Dlagnosis of Sucker Rod Pumping Well is realized the maximization of yield, the minimum and pump detection period of energy ezpenditure
It is longest.
Below by drawings and Examples, technical scheme is described in further detail.
【Brief description of the drawings】
Fig. 1 is control system schematic diagram of the present invention；
Fig. 2 is that control system Liquid output of the present invention is corresponding ETAD expected time of arrival and departure curve map of 1t/d oil wells；
Fig. 3 for the present invention between open control flow chart.
【Specific embodiment】
Beam pumping unit energy-saving control system is by the various sensors of installation, converter plant and control on beam pumping unit
Device composition processed.Speed probe and electricity ginseng acquisition module, installed load, displacement sensing on oil pumper are installed in motor position
Device, the data is activation that various sensors are gathered by controller computing and provides optimal control policy to controller, then will operation
Parameter is sent to converter plant, and converter plant is controlled to motor, finally realizes oil pump energy-saving operation control.
Refer to shown in Fig. 1, the invention discloses a kind of oil well interval pumping control system, it is characterised in that：Including oil pumper,
Controller and motor, the motor are connected with the oil pumper, for driving the oil pumper, are set on the motor
There are speed probe and electricity ginseng acquisition module, be respectively used to gather the output rotating speed and Current Voltage value of the motor simultaneously
The controller is sent to, load transducer and displacement transducer, the load transducer and position are provided with the oil pumper
Displacement sensor is connected with the controller respectively, for the measured value of the pumping rod of well pumping unit load and displacement to be sent to
The controller, the controller is connected by converter plant with the motor, the start and stop for controlling the motor.
Wherein, beam pumping unit oil well interval pumping control system by the loaded displacement pickup on beam pumping unit, take out
Oil machine automatic start-stop brake gear and take out controller composition, the controller include well head collector, electricity ginseng acquisition module,
RTU control units, display unit, operating unit, well head collector are connected with RTU control units, for by the load sensing
The collection information of device and displacement transducer is sent to the RTU control units, and the electricity ginseng acquisition module controls single with the RTU
Unit's connection, for the Current Voltage value to be sent into the RTU control units, the speed probe is controlled with the RTU
Unit wireless is connected, and the RTU control units are connected with the converter plant, for the information of collection to be sent into the frequency conversion
Device.
A kind of oil well interval pumping control method, comprises the following steps：
S1, the installed load sensor on well head polished rod eye, install displacement transducer below walking beam, gather rod-pumped well
Sucker rod load and displacement information；
By the load transducer on well head polished rod eye and the displacement transducer below walking beam, rod-pumped well is taken out
Beam hanger load and displacement are measured, and gather load and time, displacement and time graph.Well head indicator card is obtained by calculating,
Frequency acquisition is according to field output and goes out liquid rule, determines that every mouth oil well patrols one group of frequency of indicator card data of survey, to low yield
Well preferably uses the frequency of 10 minutes, and one day Effective power figure number of collection is no less than 110, between waiting the time in a stroke cycle
200 are no less than every data group points are measured.
S2, installation speed probe and electricity ginseng acquisition module on motor, the rotating speed of synchronous acquisition motor output shaft,
Motor three-phase current and information of voltage；
Electricity ginseng acquisition module is installed on motor, by voltage and current Acquisition Circuit to the three-phase current of motor,
Voltage synchronizes collection, and constant duration measures data group points no less than 200 in a stroke cycle.By three-phase electricity
Can quality analysis chip calculating power of motor.Speed probe, synchronous acquisition motor output shaft are installed in motor reel output end
Rotating speed, constant duration measures data group points no less than 200 in a stroke cycle.
S3, the information that step S1 and S2 are gathered is sent to controller, controller is sent out after calculating the parameter information of motor
Converter plant is given, oil well output computation model is set up, according to pumping and stopping determination intermittent pumping system of finding time, is filled by frequency conversion
Put by control electric current frequency and working time control motor running, carry out oil well interval pumping control.
Load and displacement electric signal reach well head collector by cable, are uploaded to RTU control units and carry out computing and ask
The motor power (output) of calculating is uploaded to RTU control units by solution work(diagram data, electricity ginseng acquisition module, and motor reel rotating speed passes through nothing
Line transport module sends data to RTU control units.When RTU control units are by computing, calculating motor running and stopping
Between, motor speed, rotational speed omega distribution and power frequency f distribution.And parameter is sent to converter plant, converter plant is by control
The controlled motors such as power frequency processed, working time are run, and carry out oil well interval pumping control.
Oil well interval pumping control method is specific as follows：
Refer to shown in Fig. 3, using control technology is opened between power graph method, load, displacement data are measured in real time, if oil pumper
Shut down, determine that oil pumper currently shuts down duration, if current duration starts oil pumper more than duration is shut down, otherwise return to carrying
Lotus, displacement are surveyed；If oil pumper is not shut down, it is determined that the point of load of setting is not contained in work(figure and the state is held
Whether the continuous time is more than setting time, if it is not greater, return to continue to survey load, displacement, if it is greater, then really
The relation of the time and The shortest operation time run after oil pumper starts is determined, if run time is less than most short operation after starting
Between, return and continue to survey load, displacement, if run time is more than The shortest operation time after starting, determine oil pumper
The time run after startup and the relation that the time is set, if run time is more than the setting time after starting, it is determined that shutting down duration
Duration+step-length was shut down equal to last time, shutdown of pumping machine returns to measurement load, displacement data in real time, if run time after starting
Less than the time of setting, it is determined that shutting down duration is equal to last time shutdown duration-step-length, shutdown of pumping machine returns to measurement load, position in real time
Move data.
Set up oil well and flow into characteristic curve model
According to Darcy's law, for planar radial flowing, the oil well output computation model of single phase fluid flow is：
In formula：H --- Effective thickness of formation, m；re--- oil well fuel feeding edge radius, m；rw--- well radius, m；
K --- in-place permeability, μm2；H --- core intersection, m；pwf--- stream pressure, MPa；pr--- static reservoir pressure, MPa；P --- pressure
Power, MPa；Ko--- oil relative permeability；Bo--- oil volume factor, m3/m3；μo--- stratum oil viscosity, mPa.s.
pwf＞ pbSituation it is as follows：
When single-phase flow is only existed in stratum, oil well output formula is
Qo=J (pr-pwf) (2)
In formula：Qo--- oil well output, m3/d；J --- productivity index, m3/(s·Pa)。
The situation of pb ＞ pr ＞ pwf is as follows：
When saturation pressure is higher than static pressure, oil well output is
In formula：QmYield when for flowing pressure being zero, m3/d。
The situation of pr ＞ pb ＞ pwf is as follows：
When saturation pressure is less than static pressure, oil well output is
In formula：Qb--- yield when stream pressure is equal to saturation pressure, m3/d；pb--- saturation pressure, Pa.
Characteristic curve is flowed into for the conventional oil well shown in formula (2)~(4), it is characterized by oil well output is with stream pressure
Drop and increase；Reduced with the increase of stream pressure.Obviously, if oil well follows tradition and flows into characteristic curve, when the intermittent pumping system of use
When spending, increase because build-up of fluid can cause stream pressure, then intermittent pumping system can reduce oil well output.
Intermittent pumping system is preferably specific as follows：
Intermittent pumping system includes two parameters：One is to stop the T that finds timeS；Two is oil pumping time TP。
Stopping taking out cycle TSInterior, well head does not produce liquid.Because well fluid level is in recovery state, therefore stream pressure is constantly in
Increase state and higher than the stream pressure of continuous oil pumping, the liquid measure for causing stratum to flow into oil jacket annular space decreases；In pumping cycle TP
Interior, be pumped into fluid in oil jacket annular space in oil pipe and ground is given rise to by oil well pump, and well head produces liquid.Lifted in oil well pump pumping former
While oily, fluid is continuously flowed into oil jacket annular space in stratum.Although oil well pump pumping liquid causes the liquid level gradually to reduce,
Because in oil pumping process, liquid level is still above the stream pressure of the liquid level of continuous oil pumping, i.e. stream pressure higher than continuous oil pumping, therefore is taking out
During oil, the liquid measure that stratum flows into pit shaft has also been reduced.
The simulation model of build-up of fluid height is specific as follows during stopping taking out：
Stopping taking out cycle TSInterior, any time liquid level meets equation below：
In formula：Hd0Hydrodynamic face during-continuous oil pumping, m；Ac- oil jacket annular space area of passage, m2；T-calculating moment, d；
HdThe hydrodynamic face of-moment t, m；pwfThe stream pressure of-moment t, Pa；Q(pwf)-moment t and stream pressure pwfCorresponding stratum access wall
The instantaneous delivery of cylinder, m3/d。
Oil well stream pressure not only with hydrodynamic face HdIt is relevant, and instantaneous delivery, the well bore of pit shaft are flowed into oil deposit parameter, stratum
Structure is relevant.This project calculates stream pressure using multiphase flow model, and circular is shown in annex I.
Build-up of fluid height H can be calculated by above-mentioned modeld, stream pressure pwf, stratum flow into pit shaft instantaneous delivery Q at any time
Between t Changing Pattern, and then following parameter can be calculated：
A) stop stratum in the cycle of taking out and flow into the liquid measure of pit shaft relative to the percentage that continuous oil pumping inflow liquid measure is declined；
B) stop to take out the height H after all end of term build-up of fluidsdmin。
Pumping cycle is specific as follows with the simulation model of oil well output in pumping cycle：
In pumping cycle TPIt is interior, any time liquid level：
In formula：psThe pump intake pressure of-moment t oil well pump, Pa；HdminRise and take out instantaneous minimum fluid depth, m；Qp
(ps)-moment t and pump intake pressure psCorresponding oil pumping pumpage, i.e. oil well instant productivity, m3/d。
Instant productivity Qp(ps) calculated by following formula：
In formula：D-oil pump plunger piston diameter, m；S-suspension point length of stroke, m；N-jig frequency, min-1；α-oil pumping pumpage
Coefficient.
Oil well pump discharge coefficient is calculated by following formula：
α=αSαFαLαV (8)
In formula：αS- plunger effective stroke coefficient；αF- coefficient of fullness；αLThe leakage factor of-pump；αV- pump intake pressure bar
The volume factor of dissolved gas crude oil under part.
Wherein：
In formula：Spump- plunger stroke length, m；K-clearance factor, K=S0/S；S0- clearance length, m；R-pumping enters
Implication liquor ratio, m3/m3；ps- oil pumping Pump Suction Nozzle pump intake pressure, MPa；pd- oil pumping pump discharge discharge pressure, MPa；N-day
Right gas polytropic process index；nw- moisture content；AP- plunger cross-sectional area, m2；Δ Q-and in a stroke procedure of plunger, liquid
Body is through the gap leakage between plunger and pump barrel, m3；BopsUnder the conditions of-Pump Suction Nozzle, the volume factor of crude oil in pump barrel；
BwpsUnder the conditions of-Pump Suction Nozzle, the volume factor of water.
Gap leakage between plunger and pump barrel is calculated by following formula：
In formula：D --- diameter of plunger, m；Δ p --- the upper and lower pressure difference of upstroke plunger, Pa；δ --- between plunger and pump barrel
Mean radius inner width, m；LC--- plungers length, m；E --- plunger center line relative to pump barrel center line eccentric throw, m；
ε --- relative eccentric ratio, ε=e/ δ；Tu--- the time corresponding to one upstroke of plunger, s；μ --- the power of oil well liquid
Viscosity, Pas.
According to above-mentioned model, it may be determined that following parameter：
A) pumping cycle TP：Liquid level is by HdminDrop to the time that continuous oil pumping liquid level is experienced；
B) oil well output：Pumping cycle T is calculated firstPInterior Liquid output, and according to stopping taking out cycle TSWith pumping cycle TP
Determine the average daily fluid production rate of oil well.
Embodiment
Refer to shown in Fig. 2, control simulation model taken out according to, it is the oil well of Q=1t/d that can calculate daily output liquid, it is ensured that
When Liquid output loss late is less than 5%, see that stopping incoming fluid average discharge and its rate of descent in the cycle of taking out is less than 14 hours, normally
Pumping is more than 8 hours.
By simulation analysis, decline boundary with reference to given allowable production rate, it is possible to it is determined that most long stop the cycle of taking out and institute
Corresponding pumping cycle.
It is not more than 5% as standard with yield rate of descent, the system of taking out between different Liquid output oil wells is carried out preferably.Difference is produced
Measuring interval system is：
As oil well output≤1t/d, a length of 12 hours when adding up to stop taking out；
It is accumulative to stop taking out duration 8 hours as oil well output 1t/d~1.5t/d；
It is accumulative to stop taking out duration 6 hours as oil well output 1.5t/d~2t/d.
It is automatic to learn according to the oil well liquid-supplying situation that indicator card judges to obtain on the basis of the initial interval time of setting
Habit, the optimal interval time of Step wise approximation oil well.Well deliverability changes, system also by being taken out between timely automated adjustment when
Between.
Above content is only explanation technological thought of the invention, it is impossible to limit protection scope of the present invention with this, every to press
According to technological thought proposed by the present invention, any change done on the basis of technical scheme each falls within claims of the present invention
Protection domain within.
Claims (10)
1. a kind of oil well interval pumping control system, it is characterised in that：Including oil pumper, controller and motor, the motor with
The oil pumper connection, for driving the oil pumper, is provided with speed probe and electricity ginseng acquisition module on the motor,
It is respectively used to gather the output rotating speed and Current Voltage value of the motor and is sent to the controller, the oil pumper
On be provided with load transducer and displacement transducer, the load transducer and displacement transducer connect with the controller respectively
Connect, for the measured value of the pumping rod of well pumping unit load and displacement to be sent into the controller, the controller passes through
Converter plant is connected with the motor, the start and stop for controlling the motor.
2. a kind of oil well interval pumping control system according to claim 1, it is characterised in that：The controller is adopted including well head
Storage, the well head collector is connected with RTU control units, for the collection of the load transducer and displacement transducer to be believed
Breath is sent to the RTU control units, and the electricity ginseng acquisition module is connected with the RTU control units, for by the electric current
Magnitude of voltage is sent to the RTU control units, the speed probe and the RTU control units wireless connection, the RTU controls
Unit processed is connected with the converter plant, for the information of collection to be sent into the converter plant.
3. a kind of oil well interval pumping control system according to claim 2, it is characterised in that be additionally provided with the controller
Display unit and operating unit, the display unit and operating unit are connected with the RTU control units respectively, for show and
Operational control.
4. a kind of oil well interval pumping control system according to claim 1, it is characterised in that：The load transducer is arranged on
On well head polished rod eye, institute's displacement sensors are arranged on walking beam lower section.
5. a kind of oil well interval pumping control method, it is characterised in that comprise the following steps：
S1, the installed load sensor on well head polished rod eye, install displacement transducer, Real-time Collection rod-pumped well below walking beam
Sucker rod load and displacement information；
S2, speed probe and electricity ginseng acquisition module are installed on motor, it is the rotating speed of synchronous acquisition motor output shaft, electronic
Machine three-phase current and information of voltage；
S3, oil well output computation model is set up, according to pumping and stopping determination intermittent pumping system of finding time, step S1 and S2 are adopted
The information of collection is sent to controller, and controller calculates the parameter information of motor and is sent to converter plant, led to by converter plant
Control electric current frequency and working time control motor running are crossed, oil well interval pumping control is carried out.
6. a kind of oil well interval pumping control method according to claim 5, it is characterised in that in step S1 and S2, a punching
Constant duration measures described information group points no less than 200 in the journey cycle.
7. a kind of oil well interval pumping control method according to claim 5, it is characterised in that in step S3, the motor
Parameter information include motor running and dwell time, motor speed, rotational speed omega distribution and power frequency f distributed intelligences.
8. a kind of oil well interval pumping control method according to claim 5, it is characterised in that：In step S3, according to oil well stream
Enter characteristic curve, set up the oil well output computation model as follows：
Wherein, h-Effective thickness of formation, m；re- oil well fuel feeding edge radius, m；rw- well radius, m；K-stratum infiltration
Rate, μm2；H-core intersection, m；pwf- stream pressure, MPa；pr- static reservoir pressure, MPa；P-pressure, MPa；Ko- oil phase is relative to be oozed
Saturating rate；Bo- oil volume factor, m3/m3；μo- stratum oil viscosity, mPa.s.
9. a kind of oil well interval pumping control method according to claim 5, it is characterised in that in step S3, during stopping taking out,
The intermittent pumping system is specially：Stopping taking out cycle TSIt is interior, the simulation model of build-up of fluid height during stopping taking out is set up, obtain
The liquid measure of pit shaft is flowed into relative to the percentage that continuous oil pumping inflow liquid measure is declined to stratum in the cycle of taking out is stopped, and stops taking out week
Height after end of term build-up of fluid, any time liquid level is as follows：
Wherein：Hd0Hydrodynamic face during-continuous oil pumping, m；Ac- oil jacket annular space area of passage, m2；T-calculating moment, d；Hd—
The hydrodynamic face of moment t, m；pwfThe stream pressure of-moment t, Pa；Q(pwf)-moment t and stream pressure pwfCorresponding stratum flows into pit shaft
Instantaneous delivery, m3/d。
10. a kind of oil well interval pumping control method according to claim 5, it is characterised in that：In step S3, oil pumping process
In, the intermittent pumping system is specially：In pumping cycle TPIt is interior, set up the imitative of oil well output in pumping cycle and pumping cycle
True mode, obtains pumping cycle TP, further according to stopping taking out cycle TSWith pumping cycle TPThe average daily fluid production rate of oil well is determined, when any
Carve liquid level as follows：
Wherein：psThe pump intake pressure of-moment t oil well pump, Pa；Hdmin- rise and take out instantaneous minimum fluid depth, m；Qp(ps)—
Moment t and pump intake pressure psCorresponding oil pumping pumpage, i.e. oil well instant productivity, m3/d。
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