CN106685050A - Power compensation type electric workover rig power calculation method - Google Patents
Power compensation type electric workover rig power calculation method Download PDFInfo
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- CN106685050A CN106685050A CN201710174932.1A CN201710174932A CN106685050A CN 106685050 A CN106685050 A CN 106685050A CN 201710174932 A CN201710174932 A CN 201710174932A CN 106685050 A CN106685050 A CN 106685050A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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Abstract
The invention discloses an electric workover rig operating system power calculation and distribution method applying a supercapacitor set, and belongs to the field of electric workover rigs. The method comprises the following steps of 1, analyzing operating conditions, wherein the requirements for required power, required torque, lifting speed and other related parameters are determined through analysis; 2, calculating working power, wherein an operating system is divided into a power part and a transmission part, and the working efficiency of the whole operating system is calculated according to the efficiency of each key device; 3, obtaining input power, wherein according to the requirement for the operating conditions, on the basis of the working efficiency of the system, the input power of the system is obtained reversely, and the power of the supercapacitor set is calculated according to an allocation principle; 4, determining a connecting mode, wherein characteristics of the supercapacitor set are analyzed, and the number of supercapacitors in the set and the connecting mode are determined according to consideration of limiting conditions and safety.
Description
Technical field
The invention mainly relates to electric workover rig power distribution computational methods, more particularly to a kind of application super capacitor group
Electric workover rig operating system power calculation and distribution method.
Background technology
To realize energy-conserving and environment-protective, electric workover rig operating system replaces Diesel engine energy supply using electric power, but at present
Mostly oil field place grid power is in 30kW -50kW or so, and power is relatively low, if only with place grid power as power source,
Workover rig performance capacity can greatly be limited.To solve this problem, normal energy storage device in parallel in systems, such as super capacitor
Group, hydraulic accumulator etc., realize power back-off, improve workover rig operating system power.
At present currently existing scheme technology is made that detaileds description to power back-off formula electric workover rig, including structure design with
Control method etc., but do not propose specific power calculation and distribution method, it is difficult to determine and connect in super capacitor group power and group
Connect mode.
The content of the invention
It is an object of the invention to provide a kind of power back-off formula electric workover rig power calculation and super capacitor group connection side
Method.The present invention reversely solves energy storage device power under this operating mode by the power of target operating condition, torque, the requirement of time, analyzes
Supercapacitor properties, determine super capacitor partial unit connecting method, contribute to the further enforcement of electric workover rig scheme.
Preferably, by taking accompanying drawing 2 as an example, calculating, but this are analyzed to super capacitor group power and group inner connection mode
Bright method is not limited to the organization plan in accompanying drawing, and the power back-off formula electric workover rig using super capacitor group is fitted
With.
For achieving the above object, technical scheme is as follows：
1) working condition analysis：According to the working condition of workover rig, analysis determines demand power, demand torque, lifts speed
The relevant parameters such as degree are required；
2) work efficiency is calculated：Operating system is divided into into power and transmission two parts, according to wherein each key equipment
Efficiency, calculates the work efficiency of overall operation system；
3) input power is solved：According to working condition demand, coupling system work efficiency, reverse solving system input work
Rate, according to distribution principle super capacitor group power is calculated；
4) connected mode is determined：Analysis super capacitor group characteristic, according to connecting in restrictive condition and security consideration determination group
Connect mode.
In the optimal technical scheme that the present invention is provided, described step 1) include：
A. workover rig target operating condition demand power is calculated：
PM=mgv+mav, (1)
Wherein, PMFor target operating condition demand power, m is well casing gross weight, and a accelerates for the instantaneous lifts of acceleration or deceleration process
Degree, v is instantaneous lifts speed.Referring to Fig. 3, the operation of workover rig monocycle can be divided into four-stage, i.e. boost phase, at the uniform velocity rank
Section, the decelerating phase and unload pipe maintenance the stage, wherein starting boost phase demand torque ripple it is larger, by fluid torque-converter realize
Self adaptation, after output reaches rated power, is changed into invariable power acceleration, therefore formula (1) is represented by again：
PM max=mgvM, (2)
Wherein, vMFor the lifting speed of at the uniform velocity process.
B. workover rig target operating condition demand torque is calculated：
Wherein, TMFor boost phase demand torque, Te is constant velocity stage's demand torque, simultaneously because work initial stage well casing weight
Amount is big, is to ensure smoothly starting, and the demand torque in formula (3) often takes TM=(1.5~2) Te.
C. calculate and lift rate request：
Wherein, it is shorter with the time in decelerating phase due to accelerating, so can estimateNormal conditions place an order
Root oil pipe is about L=10m, is to ensure work efficiency, and extubation time should be less than (t1+t2+t3) ∈ [20,40] s, therefore, vM≥
(0.25~0.5) m/s.
In the optimal technical scheme that the present invention is provided, described step 2) include：
A. the energy efficiency of dynamical system is determined：
ηa=η1·η2·η5·η6, (5)
ηb=η3·η4·η5·η6, (6)
Wherein, ηaFor the efficiency in power grid energy path, ηbFor the efficiency of super capacitor group energy path, η1For place electrical network
Power efficiency, η2For controlled rectifier efficiency, η3For super capacitor group power efficiency, η4For DC/DC stabilized current supply efficiency, η6For
Buncher efficiency.
B. drive system transmission efficiency is determined：
ηt=η7·η8·η9·η10·η11, (7)
Wherein, ηtFor drive system transmission efficiency, η7For transfer case transmission efficiency, η8For torque converter efficiency, η9To subtract
Fast device transmission efficiency, η10Shaft coupling efficiency, η11For winch transmission efficiency, therefore can determine that electrical network efficiency etaa·ηtAnd super capacitor
Group efficiency etab·ηt。
In the optimal technical scheme that the present invention is provided, described step 3) include：
A. input demand power is solved：
PM max≤PIN·η (8)
Wherein, PM maxFor maximum demanded power, η is operating system integral power transmission efficiency, PINTo be input into demand work(
Rate, brings formula (2), (5), (6) and (7) into, can solve input demand powerWherein,
P1For well site electrical network output, P3For super capacitor group output.
B. super capacitor group output is distributed：
Try to achieveArranging deformation can obtain：
In the optimal technical scheme that the present invention is provided, described step 4) include：
A. supercapacitor properties are analyzed：
The workover rig typical condition working cycle be about 80s-150s, i.e. frequency spectrums of operation concentrate on 0.0067-0.125Hz it
Between, it is good in the purely capacitive state matching of low-frequency range with super capacitor；Simultaneously its power density is big, last a long time, discharge and recharge
Number of times may be up to 100,000 times or so, and efficiency for charge-discharge is high, pollute little after discarding.
B. super capacitor group connected mode is determined：
It is determined that during super capacitor group connected mode, should be noted three restrictive conditions, including power and energy loss limit,
Charging/discharging voltage current limit and charging interval limit.
● in terms of power and energy loss restriction：
Wherein, Q is that super capacitor group exports energy, UworkFor normal working voltage, determined by charging voltage, generally
(0.8~0.9) Ue, UminTo end running voltage, to increase the service life, it is ensured that Umin>=0.5Ue, t are super capacitor electric discharge
Time, t=t in the monocycle1+t2.From formula (9), the square of energy and voltage, therefore single super electricity
Hold in the case where the life-span is ensured using about 0.92-0.52=56% energy, therefore super capacitor group maximum output energy
Qmax≤0.28C·Ue2≤P3T, is to ensure that super capacitor group can provide maximum output energy, so bring formula (9) into, thus really
Determine the lower limit of super capacitor quantity：
Wherein, nminFor the lower limit of super capacitor quantity in super capacitor group, PCFor single super capacitor power, and PC≤
Uwork·Imax, i.e. PC≤0.9Ue·Imax。
● in terms of charging interval restriction：
QC=P1·η1·η2·η4·tC≥Q (12)
Wherein, QCElectric energy, t are filled with for electrical network for super capacitor groupCIt is for charging interval, therefore charging interval：For ensure the workover rig working cycle seriality, charge need slow down and unload pipe maintenance the stage complete,
That is tC≤t3+t4, thus can obtain：
Wherein workover rig duty cycle time ratioEfficiency factor is considered simultaneously, it can thus be appreciated that super capacitor
Effective power upper limit P of group3≤ (2.2~3.2) P1, thereby determine that the upper limit of super capacitor quantity：
Wherein, nmaxFor the upper limit of super capacitor quantity.
● in terms of charging voltage and current restriction：
U3=nx·Uwork (15)
I3=ny·Ie (16)
Wherein, U3It is to ensure safety for super capacitor group total voltage, often makes U3≤ 450V, Ue are that single super capacitor is specified
Voltage max during voltage, i.e. discharge and recharge, is to ensure service life, and super capacitor is generally (0.5~0.9) Ue using voltage,
nxFor super capacitor series connection number, I3To export total current, Ie is single super capacitor output current, and its higher limit permits with work
Perhaps temperature rise is relevant, it is allowed to which temperature rise is bigger, and Ie is bigger, nyFor super capacitor parallel connection line number, connection in super capacitor group is thereby determined that
ModeBefore guarantee under two restrictive conditions, nxWith nyApproximately round.
Compared with prior art, beneficial effects of the present invention are：
1. first detailed description is made that to the specific power calculation of power back-off formula electric workover rig and distribution method, and
By process formulation, procedure, it is easy to apply mechanically；
2. the safety of system is considered, it is proposed that determine three restrictive conditions of super capacitor group inner connection mode, including
Power is limited with energy loss restriction, charging/discharging voltage current limit and charging interval, is easy to correctly select in super capacitor group
Connected mode；
3. integral Calculation Method detail specification, contributes to the further enforcement of electric workover rig scheme.
Description of the drawings
Fig. 1 is computational methods flow chart.
Fig. 2 is based on the operating system structure chart of super capacitor.
Fig. 3 is workover rig typical target working condition chart.
Wherein：1-electrical network, 2-controlled rectifier, 3-super capacitor group, 4-DC/DC stabilized current supplies, 5-inverter,
6-buncher, 7-transfer case, 8-fluid torque-converter, 9-decelerator, 10-shaft coupling, 11-winch；Solid line is in Fig. 2
Electric discharge route, dotted line be charging route, each alphabetical implication P-power, U-voltage, I-electric current, η-efficiency, i-gear ratio,
ω-rotating speed, subscript e represents specified, subscript M representative load, other numeric suffix and element sequence number one-to-one corresponding；T in Fig. 31For
Boost phase time, t11For permanent torque boost phase time, t12For invariable power boost phase time, t2For constant velocity stage's time,
t3For time in decelerating phase, t4To unload pipe maintenance phases-time.
Specific embodiment
Below in conjunction with accompanying drawing, the present invention will be further described：
1) set workover rig target operating condition to require, analysis determines relevant parameter
Referring to Fig. 3, the operation of workover rig monocycle can be divided into four-stage, i.e. boost phase, constant velocity stage, decelerating phase
The stage is keeped in repair with pipe is unloaded, wherein starting boost phase first experiences permanent torque acceleration, after rated power is reached, is changed into invariable power and is added
Speed, according to formula (2) demand power is calculated, and is obtainedSimultaneously to ensure work efficiency, extubation time should be less than
20-40s, therefore,
Referring to Fig. 2, understand that lifting of winch well casing demand torque is according to formula (3), (4) Wherein, TMFor boost phase demand torque, Te is constant velocity stage's demand torque, simultaneously because work initial stage well casing
Weight is big, is to ensure smoothly starting, often takes TM=(1.5~2) Te.
2) according to each device efficiency in operating system, evaluation work efficiency；
Referring to Fig. 2, according to formula (5), the efficiency eta in power grid energy path in dynamical system is calculateda=η1·η2·η5·η6,
According to formula (6), the efficiency eta of super capacitor group energy path in dynamical system is calculatedb=η3·η4·η5·η6, according to formula
(7) transmission efficiency η of drive system, is calculatedt=η7·η8·η9·η10·η11Thus electrical network efficiency eta is calculateda·ηtWith it is super
Capacitance group efficiency etab·ηt。
3) input power and super capacitor group power are solved；
Referring to Fig. 2, according to formula (8), P can be obtained11=P1·ηa·ηt+P3·ηb·ηt, wherein well site electrical network output
P1Generally 30kW -50kW, concrete surge well field time operating mode decision, P3For super capacitor group output, calculate
4) energy storage device characteristic is analyzed, determines energy storage device connected mode
When super capacitor group 3 is as energy storage device, it is impossible to the parameter such as active control its output, voltage and current.Its
In, output size depends on loading demand, and initial discharge voltage depends on charging voltage, with the carrying out of discharge process,
Discharge voltage is constantly reduced, and discharge current size meetsLimited according to three restrictive conditions, i.e. power and energy loss,
Charging/discharging voltage current limit and charging interval limit, it may be determined that the restrictive condition of quantity and connected mode in super capacitor group：
In terms of power and energy loss restriction, from formula (10)Wherein Q is
Super capacitor group exports energy, UworkFor normal working voltage, determined by charging voltage, generally (0.8~0.9) Ue, UminFor
Cut-off running voltage, to increase the service life, it is ensured that Umin>=0.5Ue, t be super capacitor discharge time, t=t1+ in the monocycle
t2.By the above resultsBring into, be to ensure that super capacitor group can provide maximum output energy, it may be determined that super
Level electric capacity quantity lower limit beWherein PCFor single super capacitor power, and PC≤Uwork·Imax,
That is PC≤0.9Ue·Imax。
In terms of charging interval restriction, by formula (12), (13) Q is knownC=P1·η1·η2·η4·tC>=Q andWherein QCElectric energy, t are filled with for electrical network for super capacitor groupCFor the charging interval, therefore
Charging interval is：To ensure the seriality of workover rig working cycle, charging needs slowing down and unloading Guan Wei
The stage of repairing completes, i.e. tC≤t3+t4, thus can obtain,Wherein workover rig
Duty cycle time ratioEfficiency factor is considered simultaneously, it can thus be appreciated that effective power upper limit P of super capacitor group3
≤ (2.2~3.2) P1, it may be determined that the upper limit of super capacitor quantity is
In terms of charging voltage and current restriction, by formula (15), (16) U is known3=nx·Uwork, wherein U3For super capacitor group
Total voltage, is to ensure safety, often makes U3Voltage max when≤450V, Ue are single super capacitor rated voltage, i.e. discharge and recharge,
To ensure service life, super capacitor is generally (0.5~0.9) Ue, n using voltagexFor super capacitor series connection number, I3For defeated
Go out total current, Ie is single super capacitor output current, and its higher limit allows temperature rise relevant with work, it is allowed to which temperature rise is bigger, Ie
It is bigger, nyFor super capacitor parallel connection line number, super capacitor group inner connection mode is thereby determined thatEnsureing
Under front two restrictive condition, nxWith nyApproximately round.
The above-mentioned calculating process of Jing can determine that super capacitor group outputSuper capacitor number in group
AmountOn group inner connection modeBefore guarantee
Under two restrictive conditions, nxWith nyApproximately round.
Claims (5)
1. a kind of power back-off formula electric workover rig power calculation algorithms, it is comprised the following steps：1) working condition analysis：Foundation
The working condition of workover rig, analysis determines demand power, demand torque, lifts the requirement of the relevant parameters such as speed；2) work efficiency
Calculate：According to the efficiency of each key equipment in operating system, the work efficiency of overall operation system is calculated；3) input work is solved
Rate：According to working condition demand, coupling system work efficiency, reverse solving system input power, calculate super according to distribution principle
Level capacitance group power；4) connected mode is determined：Analysis super capacitor group characteristic, according to restrictive condition and security consideration group is determined
Inner connection mode.
2. power back-off formula electric workover rig power calculation algorithms as described in claim 1, it is characterised in that performing step
It is rapid 1) when, workover rig typical condition is analyzed, according to the operating characteristic of four-stage in the monocycle, it may be determined that：
● demand power P under target operating conditionM=mgv+mav, wherein m are well casing gross weight, and a is instantaneously carried for acceleration or deceleration process
Acceleration is risen, v is instantaneous lifts speed, referring to Fig. 3, it may be determined that PM max=mgvM, wherein vMFor tube drawing initial stage constant velocity stage
Lifting speed；
● demand torque is different within each stage under target operating condition, boost phase demand torqueAt the uniform velocity rank
Section demand torqueWherein D is diameter of cylinder, is to ensure smoothly starting, often because the initial stage well casing weight that works is big
Take TM=(1.5~2) Te；
● lifting speed under target operating condition can be by formulaIt is determined that, wherein t1For boost phase when
Between, t2For constant velocity stage's time, t3For the time in decelerating phase, due to accelerating and the time in decelerating phase is shorter, so can estimateUnder normal circumstances single oil pipe is about L=10m, is to ensure work efficiency, and extubation time should be less than (t1+t2
+t3) ∈ [20,40] s, therefore vM>=(0.25~0.5) m/s.
3. power back-off formula electric workover rig power calculation algorithms as described in claim 1, it is characterised in that performing step
It is rapid 2) when, according to the operating system structure in Fig. 2, it may be determined that：
● the efficiency eta in power grid energy path in dynamical systema=η1·η2·η5·η6, the efficiency eta of super capacitor group energy pathb
=η3·η4·η5·η6, wherein η1For place grid power efficiency, η2For controlled rectifier efficiency, η3For super capacitor group power
Efficiency, η4For DC/DC stabilized current supply efficiency, η6For buncher efficiency, η1—η6It is true that big I combines each device performance parameters
It is fixed；
● drive system transmission efficiency ηt=η7·η8·η9·η10·η11, wherein η7For transfer case transmission efficiency, η8For fluid power change
Square device efficiency, η9For decelerator transmission efficiency, η10Shaft coupling efficiency, η11For winch transmission efficiency, therefore can determine that electrical network efficiency
ηa·ηtWith super capacitor group efficiency etab·ηt。
4. power back-off formula electric workover rig power calculation algorithms as described in claim 1, it is characterised in that performing step
It is rapid 3) when, it may be determined that：
● input demand power PM max≤PINη, wherein, PM maxFor maximum demanded power, η is operating system entirety
Power transmission efficiency, PINFor be input into demand power, bring into it is above-mentioned push over result, input demand power can be solvedWherein P1For well site electrical network output, P3For super capacitor group output；
● according to input demand powerSuper capacitor group output is determined after arrangement
5. power back-off formula electric workover rig power calculation algorithms as described in claim 1, it is characterised in that performing step
It is rapid 4) when, according to three restrictive conditions, it includes herein below：
● determine super capacitor numerical lower limits nmin
According to power and energy loss restrictive condition, it is known thatWherein Q is super capacitor group
Output energy, UworkFor normal working voltage, determined by charging voltage, generally (0.8~0.9) Ue, UminTo end work electricity
Pressure, to increase the service life, it is ensured that Umin>=0.5Ue, t be super capacitor discharge time, t=t in the monocycle1+t2, by above-mentioned knot
ReallyBring into, be to ensure that super capacitor group can provide maximum output energy, it may be determined that super capacitor quantity
Lower limit beWherein PC is single super capacitor power, and PC≤Uwork·Im ax, i.e. PC≤
0.9Ue·Im ax；
● determine super capacitor transformation nmax
According to charging interval restrictive condition, it is known that QC=P1·η1·η2·η4·tC>=Q and
Wherein QCElectric energy, t are filled with for electrical network for super capacitor groupCFor the charging interval, arrangement can obtain the charging interval：
For ensure the workover rig working cycle seriality, charge need slow down and unload pipe maintenance the stage complete, i.e. tC≤t3+t4, thus
Can obtain,Wherein workover rig duty cycle time ratio
Efficiency factor is considered simultaneously, it can thus be appreciated that effective power upper limit P of super capacitor group3≤ [2.2~3.2] P1, it may be determined that super electricity
Hold quantity the upper limit be
● determine super capacitor group inner connection mode
According to charging voltage and current restrictive condition, it is known that U3=nxUwork, wherein U3It is to ensure peace for super capacitor group total voltage
Entirely, U is often made3≤ 450V, UworkVoltage is used for super capacitor, is to ensure that service life often takes Uwork=[0.5~0.9] Ue, its
Voltage max when middle Ue is single super capacitor rated voltage, i.e. discharge and recharge, nxFor super capacitor series connection number, I3For output
Total current, Ie is single super capacitor output current, and its higher limit allows temperature rise relevant with work, it is allowed to which temperature rise is bigger, and Ie gets over
Greatly, nyFor super capacitor parallel connection line number, super capacitor group inner connection mode is thereby determined thatBefore guarantee
Under two restrictive conditions, nxWith nyApproximately round；
The above-mentioned calculating process of Jing can determine that super capacitor group outputSuper capacitor quantity in groupOn group inner connection modeTwo before guarantee
Under restrictive condition, nxWith nyApproximately round.
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| US11955782B1 (en) | 2022-11-01 | 2024-04-09 | Typhon Technology Solutions (U.S.), Llc | System and method for fracturing of underground formations using electric grid power |
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| CN203289378U (en) * | 2013-05-07 | 2013-11-13 | 中国石油天然气集团公司 | Electric workover rig control system based on supercapacitor power compensation |
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| US11955782B1 (en) | 2022-11-01 | 2024-04-09 | Typhon Technology Solutions (U.S.), Llc | System and method for fracturing of underground formations using electric grid power |
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