CN101135910A - oil pumping with lever system ground facilities efficiency evaluate method - Google Patents

oil pumping with lever system ground facilities efficiency evaluate method Download PDF

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CN101135910A
CN101135910A CNA2007101753732A CN200710175373A CN101135910A CN 101135910 A CN101135910 A CN 101135910A CN A2007101753732 A CNA2007101753732 A CN A2007101753732A CN 200710175373 A CN200710175373 A CN 200710175373A CN 101135910 A CN101135910 A CN 101135910A
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motor
efficiency
well
ground
data
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CN100476668C (en
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黄伟
饶建华
刘宏昭
王守虎
姚斌
吕亿明
陈伟
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中国石油天然气股份有限公司
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Abstract

The method comprises: a) drawing a operating condition graph, and dividing the operating condition graph into four areas which are an area of test parameter under investigation, an area of normal working, an area of low mechanical efficiency, and an area of motor low load and load efficiency; b) determining the location of individual well in the graph: testing the motor running parameter, pumping unit well suspension parameter, and using diagram of work fluidounce metering to fast measure the fluidounce yield; calculating the motor input and output power, motor load rate, pumping unit polished rod power and pumping unit system ground efficiency; filling the obtained motor load rate, pumping unit system ground efficiency data into the ground electromechanical system operating condition graph.

Description

Rod pumping system uphole equipment efficiency rating method

Technical field

The present invention relates to oil field sucker rod pumping technical field, particularly a kind of efficiency analysis of rod pumping system uphole equipment, evaluation method.

Background technology

Rod pumping system is made up of ground Mechatronic Systems and downhole system.The ground Mechatronic Systems comprises drive motor, gear train and oil pumper four-bar mechanism; Downhole system comprises sucker rod, oil pipe and oil well pump, and oil reservoir.In time pass judgment on and optimize and revise the rod-pumped well working condition, to improving rod pumping system efficient, prolonging service life of equipment, it is very meaningful to improve the oil recovery economic benefit.Therefore, the evaluation study of rod pumping system working condition is subjected to relevant works technician and managerial personnel's attention always.

In the later stage eighties 20th century, each oil recovery factory of Daqing oil field begins to use rod-pumped well operating mode control chart and instructs oil well production and management, progressively quotes in other oil fields afterwards, and is improved according to different production environments separately.At present, existing rod-pumped well operating mode control chart provides is relation between pump efficiency and working submergence, reflection be Changing Pattern between rod pumping system down-hole efficient and oil well pump suction pressure.Yet rod pumping system efficient is made up of surface efficiency and down-hole efficient two parts.Existing rod pumping system efficient studies does not deeply relate to the operating mode of ground Mechatronic Systems, can not pass judgment on rod pumping system ground Mechatronic Systems working condition according to oil field conventionally test data message, can't estimate ground drive motors, gear train and oil pumper four-bar mechanism working condition exactly.Can not finish that this patent reaches oil pumper ground is comprised do not reach the purpose of grasping the pumping well system operating mode all sidedly at the synthetic operation status evaluation of the whole rod pumping system ground Mechatronic Systems of gear train that motor, belt and the reductor of oil pumper are formed and oil pumper four-bar mechanism.

Summary of the invention

The purpose of this invention is to provide a kind of rod pumping system uphole equipment efficiency rating method, pass judgment on rod pumping system ground Mechatronic Systems working condition with oil field conventionally test data message.Be the Mechatronic Systems efficiency rating of sucker rod pumping motor-pumped well ground, oil field, provide a kind of intuitively, means accurately and efficiently, to improve the monitoring of oil well sucker rod pumping status of equipment, adjustment and management level.Overcome the operating mode that existing rod pumping system efficient studies does not relate to the ground Mechatronic Systems, rod pumping system ground Mechatronic Systems working condition can not be passed judgment on, the deficiency of ground drive motors, gear train and oil pumper four-bar mechanism working condition can't be determined exactly.

The present invention is achieved in that

A. draw sucker rod pumping motor-pumped well ground Mechatronic Systems working condition chart

Motor load rate ξ with oil pumper is the horizontal ordinate variable, pumping unit system surface efficiency η UpFor the ordinate variable is drawn rectangular coordinate plane figure.On rectangular coordinate plane figure, follow these steps to operation:

(1) draws motor efficiency η Mt-load factor ξ family curve is a upper border line;

(2) draw following boundary line 0.77c η Mt, c is 0.7~0.85;

(3) draw horizontal ordinate ξ=ξ 0Perpendicular line, ξ 0Be 0.1-0.25;

(4) horizontal line of the intersection point of this perpendicular line and upper border line work and axis of ordinates intersect excessively.

Through above-mentioned mapping, sucker rod pumping motor-pumped well ground Mechatronic Systems working condition chart is divided into 4 zones: be Mechatronic Systems test parameter district to be looked into, ground on the upper border line; It between upper border line and the following boundary line Mechatronic Systems electric system district working properly, ground; It under the following boundary line the inefficient district of ground Mechatronic Systems mechanical part; Axis of ordinates and ξ=ξ 0Be Mechatronic Systems motor underloading poor efficiency district, ground in the little rectangular area, the lower left corner that perpendicular line surrounded.

Rod-pumped well ground Mechatronic Systems operating mode is divided into 4 zones.

(1) test parameter district to be looked into

Rod-pumped well surface efficiency η UpEqual motor operational efficiency η MtWith oil pumper operational efficiency η mProduct,

η up=η mtη m

Because mechanical drive has energy loss, so η m<1, so the rod-pumped well surface efficiency has

η upmt

Be η Mt(ξ) curve is can not take place in the data reality of the coboundary curve top in the accompanying drawing 1, thus in the Mechatronic Systems working condition chart of sucker rod pumping motor-pumped well ground η Mt(ξ) top of curve is test parameter district to be looked into.

(2) mechanical movement poor efficiency district

The oil pumper ground system is made up of belt, speed reduction unit and oil pumper four-bar mechanism (comprising wire rope).When each several part well moved, its efficient reached respectively: band transmission efficiency η Belt0.9, gear reducer transmission efficiency η Red0.9, the linkage assembly efficiency eta b0.95, its comprehensive mechanical efficiency eta MfineFor:

η mfine>0.9·0.9·0.95≈0.77

Consider oil pumper can not each position operational excellences always all, the mechanical efficiency η of oil pumper operate as normal MnThan inefficiency under the kilter, use one to define the lower limit of oil pumper up-time efficiency value, then η less than 1 coefficient c MnC η Mfine≈ 0.77c (c be according to exploiting field device type, the operation time limit determine less than 1 constant, generally get 0.7~0.85), obtain oil pumper operation surface efficiency relational expression just often thus

η up>0.77cη mt

I.e. curve 0.77c η in the Mechatronic Systems working condition chart of sucker rod pumping motor-pumped well ground MtThe below be mechanical movement poor efficiency district.

(3) Mechatronic Systems district working properly

According to the above discussion as can be known, in the Mechatronic Systems working condition chart of sucker rod pumping motor-pumped well ground, be in curve η Mt(ξ) below and curve 0.77c η MtThe zone of top is Mechatronic Systems district working properly

(4) motor underloading poor efficiency district

If it is excessive that capacity motor is selected, when load factor is relatively low, forms the low load with strong power state, thereby cause the ground Mechatronic Systems to work in the poor efficiency district.Load-rate of motor is lower than certain value ξ 0Zone definitions be motor underloading poor efficiency district, as shown in Figure 1.

B. individual well is in determining of Mechatronic Systems working condition chart position, sucker rod pumping motor-pumped well ground

(1) utilize electrical parameter measuring instrument to measure electric current I, voltage V, the active power P of motor of oil extractor aWith reactive power P V

(2) utilize device measuring rod-pumped well polished rod load PRL, stroke s, jig frequency N such as polished rod pump dynamograph;

(3) utilize power graph method oil well liquid volume measurement, or the dual-volume storage one-well metering is measured the production fluid amount Q of rod-pumped well; Or calculate oilwell produced fluid amount Q with following formula

Q=1440αnSA p m 3/d;

α---discharge coefficient

N---jig frequency

S---stroke

A p---the pump plunger sectional area

In the technique scheme, after well head measures sucker rod load and displacement data, adopt remote information transmission, the information transmission of gathering behind data processing point, is handled.Concrete measurement mechanism and data processing step are as follows:

A, on-site data gathering components and parts mainly comprise: well site power supply, load transducer, displacement transducer, RTU module, data link receiving set, high-gain omni-directional antenna.

The load transducer installation site is on the well head poliched rod eye, and sensor is accepted the sucker rod polished rod load when oil pumper moves, and causes the internal strain sheet to deform, and finally transforms into the load change of oil pumper bar.

Displacement transducer is made up of magnet steel and hall probe two parts.Walking beam moves up and down in the oil pumper course of work, be installed in magnet steel on oil pumper walking beam and the support correspondence position and the variable in distance between the hall probe, the signal that this moment, hall probe was gathered is strong and weak to be changed, be converted into current signal through processing of circuit, after handling, RTU identifies upper dead center, bottom dead centre (computation period again, be jig frequency), simultaneously walking beam angle signal and load signal are pressed the corresponding acquisition of equi-time point data merit diagram data.

RTU module (teledata control terminal) is the system hardware most important part, finishes well data collection and control specially.It provides a plurality of and the interface on-the-spot test end, can gather Various types of data respectively, and changes and be stored in the middle of the temporary register, becomes the form that computing machine can be discerned, and can realize control to oil well by loading routine.

Data transmission receives can utilize several data transmission modes such as data radio station, Industrial Ethernet, CDMA, GPRS, GSM.The data of gathering realize by high-gain omni-directional antenna to the transmission of data processing point.

B, data processing point: mainly carry out the reception and the processing of image data, adopt power supply power supply in the station, main device comprises: the data processing equipments such as center antenna, central control unit and computing machine, printer that are used to receive the image data that each data collection point transmits.

The device of summary parameter measurement is installed and technological process, helps to understand technical solution of the present invention.

At first, by being installed in the displacement transducer of load transducer on the well head poliched rod eye and walking beam below, rod-pumped well sucker rod load and displacement are measured.Load and displacement electric signal reach well group control box inner control terminal (RTU) by cable, again by the well group antenna, image data is reached main website center receiving antenna with the form of ripple carry out Data Receiving.

Secondly, be that digital signal reaches computing machine in the station by data processing point (control center) wireless server with the conversion of signals that receives.Utilize the measuring software on the computing machine that oil well is carried out the calculating of production fluid amount.

(4) test of oil well useful power is calculated

P h = ρ f QH 8810

ρ in the formula f---well liquid density

Q---oilwell produced fluid amount,

H---liquid effective lift height H = H 0 + P 0 - P c ρ f g

H 0---working fluid level is dark

P 0---tubing pressure

p c---casing pressure

G---acceleration of gravity

(5) calculate the active power of utilizing test and calculate the motor of oil extractor power input, formula is:

P 1 = 1 N Σ i = 1 N max ( P a ( i ) , 0 )

In the formula, function m ax (P a(i), 0) be defined as and get P a(i) and the maximal value in 0 liang of value, the result only counts positive useful work, and N represents the number of crank up one-period test point.

(6) calculate the motor of oil extractor load factor, method is: motor characteristic working curve η, ξ, P that the motor manufacturer of utilization oil pumper provides 1With P 2Relation is with P 1Substitution obtains motor of oil extractor load factor ξ.

(7) calculate oil-extractor polish-rod power, formula is:

P r = 1 N Σ i = 1 N P ( i ) ν ( i )

In the formula, P (i), ν (i) are respectively i instantaneous polished rod polished rod load and the suspension point linear velocity of test point crank operation.

(8) calculate the pumping unit system surface efficiency, formula is:

η up = P r P 1

(9) will calculate motor load rate ξ, the pumping unit system surface efficiency η that obtains UpData are input to sucker rod pumping motor-pumped well ground Mechatronic Systems working condition chart, to falling into the zone of sucker rod pumping motor-pumped well ground Mechatronic Systems working condition chart, the surface efficiency that can determine this rod-pumped well is in that Mechatronic Systems is working properly, mechanical part poor efficiency, motor underloading poor efficiency or test parameter a certain situation to be looked into according to these data.

If oil pumper uphole equipment efficient is in district working properly, then keep the work at present situation; If oil pumper uphole equipment efficient is in a certain situation that mechanical part poor efficiency district, motor underloading poor efficiency district or test parameter wait to look into the district, then take corresponding measure.

Above-mentioned drawing and evaluation work are finished automatically by computing machine and software.

The invention has the beneficial effects as follows: rod pumping system uphole equipment efficiency rating method, " sucker rod pumping motor-pumped well ground Mechatronic Systems working condition chart " that proposes and individual well position are in the drawings determined, because the parameter of considering is more, can be comprehensively the system health of evaluating pumping oil motor-pumped well apace.Instruct the production management of oil well and optimize and revise.By " rod pumping system uphole equipment efficiency rating method " the on-the-spot 128 mouthfuls of wells in certain oil district are analyzed, estimated and carry out field experiment, grasped whole oil well conditions exactly, pinpoint the problems and in time keep in repair, handle.Make rod pumping system ground, Ben You district Mechatronic Systems average system efficient bring up to 21.92%, improved 2.61% by 19.31%; Average individual well day power consumption is reduced to 95.26kwh by 114.74kwh, individual well day economize on electricity 19.48kwh.

Description of drawings

Fig. 1 is a sucker rod pumping motor-pumped well ground Mechatronic Systems working condition chart;

Fig. 2 is the 60 mouthfuls of oil wells in main road ditch exploiting field position distribution situations on the Mechatronic Systems working condition chart of sucker rod pumping motor-pumped well ground.

Embodiment

Embodiment:

A. draw sucker rod pumping motor-pumped well ground Mechatronic Systems working condition chart, consult Fig. 1.

With motor load rate ξ is the horizontal ordinate variable, pumping unit system surface efficiency η UpFor the ordinate variable is drawn rectangular coordinate plane figure.On rectangular coordinate plane figure, follow these steps to operation:

(1) draws motor efficiency η Mt-load factor ξ family curve is a upper border line;

(2) draw following boundary line 0.77c η Mt, c=0.7;

(3) draw horizontal ordinate ξ=ξ 0Perpendicular line, ξ 0=0.11;

(4) horizontal line of the intersection point of this perpendicular line and upper border line work and axis of ordinates intersect excessively.

Through above-mentioned mapping, sucker rod pumping motor-pumped well ground Mechatronic Systems working condition chart is divided into 4 zones: be Mechatronic Systems test parameter district to be looked into, ground on the upper border line; It between upper border line and the following boundary line Mechatronic Systems electric system district working properly, ground; It under the following boundary line the inefficient district of ground Mechatronic Systems mechanical part; Axis of ordinates and ξ=ξ 0Be Mechatronic Systems motor underloading poor efficiency district, ground in the little rectangular area, the lower left corner that perpendicular line surrounded.As shown in Figure 1.

Draw long celebrating part oil well ground, main road ditch operation area, oil field Mechatronic Systems operating mode Evaluation and Control figure.

B. individual well is in determining of Mechatronic Systems operating mode evaluation map position, ground, consults Fig. 2, is example with long celebrating main road ditch operation area, oil field sieve 40-37 well, and concrete steps are as follows

(1) utilize electrical parameter measuring instrument to measure electric current I, voltage V, the active power P of motor of oil extractor aWith reactive power P v

(2) utilize device measuring rod-pumped well polished rod load PRL, stroke s, jig frequency N such as polished rod pump dynamograph;

(3) utilize the production fluid amount Q of power graph method oil well liquid measure measurement rod-pumped well, and calculate oil well useful power;

(4) measure calculating motor of oil extractor power input, formula is:

P 1 = 1 N Σ i = 1 N max ( P a ( i ) , 0 ) = 3.46 kW

The number N=144 of crank up one-period test point.

(5) calculate the motor of oil extractor load factor, with P 1The motor characteristic working curve η of the oil pumper of substitution match, ξ, P 1With P 2Relation, obtaining motor of oil extractor load factor ξ is 21%.

(6) calculate oil-extractor polish-rod power, formula is:

P r = 1 N Σ i = 1 N P ( i ) ν ( i ) = 272.73 144 = 1.894 kW

(7) calculate the pumping unit system surface efficiency, formula is:

η up = P r P 1 = 54.67 %

(8) will calculate motor load rate ξ, the pumping unit system surface efficiency η that obtains UpData are filled into ground Mechatronic Systems operating mode evaluation map, referring to Fig. 2.Ground load rate one efficiency calculation of all the other wells is the same.According to these data to falling into the zone of ground Mechatronic Systems operating mode evaluation map, promptly the surface efficiency of this rod-pumped well of decidable be in that Mechatronic Systems is working properly, mechanical part poor efficiency, motor underloading poor efficiency or test parameter a certain situation to be looked into.

(9) if oil pumper uphole equipment efficient is in district working properly, then keep the work at present situation; If oil pumper uphole equipment efficient is in a certain situation that mechanical part poor efficiency district, motor underloading poor efficiency district or test parameter wait to look into the district, then take corresponding measure.

Have 60 mouthfuls of oil wells among this figure; can clearly find out that from figure that 42 mouthfuls of well surface work states are arranged is normal; 8 mouthfuls of hole motor capacity are excessive; there are 4 mouthfuls of oil well test data further to examine; 6 mouthfuls of oil well surface work polished rod horsepowers undesired or the indicator diagram measurement data computation are less than normal, coincide with actual conditions.

Claims (4)

1. rod pumping system uphole equipment efficiency rating method is characterized in that:
A. draw sucker rod pumping motor-pumped well ground Mechatronic Systems working condition chart
Motor load rate ξ with oil pumper is the horizontal ordinate variable, pumping unit system surface efficiency η UpDraw rectangular coordinate plane figure for the ordinate variable, on rectangular coordinate plane figure, follow these steps to operation:
(1) draws motor efficiency η Mt-load factor ξ family curve is a upper border line;
(2) draw following boundary line 0.77c η Mt, c is 0.7~0.85;
(3) draw horizontal ordinate ξ=ξ 0Perpendicular line, ξ 0Be 0.1-0.25;
(4) horizontal line of the intersection point of this perpendicular line and upper border line work and axis of ordinates intersect excessively;
Through above-mentioned steps, draw out sucker rod pumping motor-pumped well ground Mechatronic Systems working condition chart,
Sucker rod pumping motor-pumped well ground Mechatronic Systems working condition chart is divided into 4 zones: be Mechatronic Systems test parameter district to be looked into, ground on the upper border line; It between upper border line and the following boundary line Mechatronic Systems electric system district working properly, ground; It under the following boundary line the inefficient district of ground Mechatronic Systems mechanical part; Axis of ordinates and ξ=ξ 0Be Mechatronic Systems motor underloading poor efficiency district, ground in the little rectangular area, the lower left corner that perpendicular line surrounded,
B. individual well is in determining of Mechatronic Systems working condition chart position, sucker rod pumping motor-pumped well ground
(1) utilize electrical parameter measuring instrument to measure electric current I, voltage V, the active power P of individual well motor of oil extractor aWith reactive power P V
(2) utilize device measuring individual well rod-pumped well polished rod load PRL, stroke s, jig frequency N such as polished rod pump dynamograph;
(3) utilize power graph method oil well liquid volume measurement, or the dual-volume storage one-well metering is measured the production fluid amount Q of rod-pumped well; Or calculate oilwell produced fluid amount Q with following formula
Q=1440αnSA p m 3/d;
α---discharge coefficient
N---jig frequency
S---stroke
A p---the pump plunger sectional area
(4) test of oil well useful power is calculated
P h = ρ f QH 8810
ρ in the formula f---well liquid density
Q---oilwell produced fluid amount,
H---liquid effective lift height H = H 0 + p 0 - p c ρ f g
H 0---working fluid level is dark
p 0---tubing pressure
p c---casing pressure
G---acceleration of gravity
(5) utilize the active power of test to calculate the motor of oil extractor power input, formula is:
P 1 = 1 N Σ i = 1 N max ( P a ( i ) , 0 )
In the formula, function m ax (P a(i), 0) be defined as and get P a(i) and the maximal value in 0 liang of value, the result only counts positive useful work, and N represents the number of crank up one-period test point;
(6) calculate the motor of oil extractor load factor, method is: motor characteristic working curve η, ξ, P that the motor manufacturer of utilization oil pumper provides 1With P 2(output power of motor) relation is with P 1Substitution obtains motor of oil extractor load factor ξ;
(7) calculate oil-extractor polish-rod power, formula is:
P r = 1 N Σ i = 1 N P ( i ) υ ( i )
In the formula, P (i), υ (i) are respectively i instantaneous polished rod polished rod load and the suspension point linear velocity of test point crank operation;
(8) calculate the pumping unit system surface efficiency, formula is:
η up = P r P 1
(9) will calculate motor load rate ξ, the pumping unit system surface efficiency η that obtains UpData are input to sucker rod pumping motor-pumped well ground Mechatronic Systems working condition chart;
Above-mentioned drawing and evaluation work are finished automatically by computing machine and software;
The on-site data gathering components and parts mainly comprise: well site power supply, load transducer, displacement transducer, RTU module, data link receiving set, high-gain omni-directional antenna;
The load transducer installation site is on the well head poliched rod eye;
Displacement transducer is made up of magnet steel and hall probe two parts, be installed on oil pumper walking beam and the support correspondence position, variable in distance between magnet steel and the hall probe, the hall probe collection is converted into current signal through processing of circuit, after RTU handles, identify upper dead center, bottom dead centre again, simultaneously walking beam angle signal and load signal are pressed the corresponding acquisition of equi-time point data merit diagram data;
The RTU module is the system hardware most important part, finish well data collection and control specially, provide a plurality of and the interface on-the-spot test end, gather Various types of data respectively, and change and be stored in the middle of the temporary register, be the form that computing machine can be discerned, and can be by the control of loading routine realization to oil well;
It is to utilize data radio station, Industrial Ethernet, CDMA, GPRS or GSM data transfer mode that data transmission receives; The data of gathering realize by high-gain omni-directional antenna to the transmission of data processing point;
Data processing point main device comprises: the data processing equipment such as center antenna, central control unit and computing machine, printer that is used to receive the image data that each data collection point transmits.
2. rod pumping system uphole equipment efficiency rating method according to claim 1, it is characterized in that: according to the position of individual well at sucker rod pumping motor-pumped well ground Mechatronic Systems working condition chart, the surface efficiency of judging this rod-pumped well is in that Mechatronic Systems is working properly, mechanical part poor efficiency, motor underloading poor efficiency or test parameter state to be looked into.
3. rod pumping system uphole equipment efficiency rating method according to claim 1 is characterized in that: if oil pumper uphole equipment efficient is in district working properly, then keep the work at present situation; If oil pumper uphole equipment efficient is in a certain situation that mechanical part poor efficiency district, motor underloading poor efficiency district or test parameter wait to look into the district, then take corresponding measure.
4. rod pumping system uphole equipment efficiency rating method according to claim 1 is characterized in that: by surface efficiency η UpWith motor operational efficiency η MtBetween concern η Up<η MtDetermine test parameter district to be looked into; According to η Up>0.77c η MtDetermine mechanical part poor efficiency district; According to ζ 0Determine motor underloading poor efficiency district.
CNB2007101753732A 2007-09-29 2007-09-29 Efficiency estimating method of ground equipment of oil pumping system with lever CN100476668C (en)

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CN102587861B (en) * 2011-01-10 2015-01-21 中国石油天然气股份有限公司 System and method for automatic electric heating control for oil pumping well
CN102587861A (en) * 2011-01-10 2012-07-18 中国石油天然气股份有限公司 System and method for automatic electric heating control for oil pumping well
CN102306341A (en) * 2011-07-22 2012-01-04 哈尔滨理工大学 System energy saving and evaluating method for optimized matching of oil pumping machine and motor
WO2014040264A1 (en) * 2012-09-14 2014-03-20 中国石油天然气股份有限公司 Method and system for measuring dynamic liquid level of oil well
CN103498647A (en) * 2013-09-11 2014-01-08 中国石油天然气股份有限公司 Parameter adjusting method and system for improving system efficiency of rod-pumped well
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