CN105134575B - A kind of force analysis method of oil well pump and device - Google Patents

A kind of force analysis method of oil well pump and device Download PDF

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Publication number
CN105134575B
CN105134575B CN201510552246.4A CN201510552246A CN105134575B CN 105134575 B CN105134575 B CN 105134575B CN 201510552246 A CN201510552246 A CN 201510552246A CN 105134575 B CN105134575 B CN 105134575B
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China
Prior art keywords
plunger
sucker rod
oil well
pressure
well pump
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CN201510552246.4A
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CN105134575A (en
Inventor
马振
刘德铸
张洪君
曲绍刚
孙振宇
杨宝春
王智博
卢丽丝
张成博
赵吉成
刘锦
贺梦琦
刘洪芹
杨昕
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Petrochina Co Ltd
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Petrochina Co Ltd
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Priority to CN201510552246.4A priority Critical patent/CN105134575B/en
Publication of CN105134575A publication Critical patent/CN105134575A/en
Priority to RU2015156837A priority patent/RU2615548C1/en
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
    • E21B47/008—Monitoring of down-hole pump systems, e.g. for the detection of "pumped-off" conditions
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
    • E21B43/121—Lifting well fluids
    • E21B43/126—Adaptations of down-hole pump systems powered by drives outside the borehole, e.g. by a rotary or oscillating drive
    • 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
    • F04B51/00—Testing machines, pumps, or pumping installations
    • 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
    • F04B2205/00—Fluid parameters

Abstract

The application provides a kind of force analysis method of oil well pump and device.Methods described includes calculating first pressure, second pressure, inertia force, frictional force, resistance, jacking force, the 3rd pressure and the 4th pressure producing during the described sucker rod described plunger motion of drive, and the direction of described plunger motion is driven according to described sucker rod, choose the power corresponding with the direction of motion from above-mentioned various power, and the composite force that described sucker rod lower end is subject to is calculated based on the power chosen.A kind of force analysis method of oil well pump and device that the embodiment of the present application provides, making a concerted effort according to suffered by the sucker rod lower end that analysis obtains, can select suitable oil well pump to carry out operation for different oil reservoir situations.

Description

A kind of force analysis method of oil well pump and device
Technical field
The application is related to field of petroleum exploitation, particularly to a kind of force analysis method of oil well pump and device.
Background technology
Sucker-rod pumping is a kind of method that most widely artificial lift is recovered the oil, and probably there is more than 80% oil well in the whole world It is all to be exploited although in the totle drilling cost of whole Dlagnosis of Sucker Rod Pumping Well production system, oil well pump accounts for using rod pumping pump Ratio is not especially big, but oil well pump is but the critical component determining oil rig operating technology, the work shape of oil well pump Condition has a significant impact for the pump detection period tool of oil well.In the design basis of conventional sucker rod pump, produced to solve oil field Occur in journey shake out, the oily thick, specific question such as gas, inclined shaft, have developed various types of special oil well pumps.
At present, the technology of special oil well pump not exclusively maturation is in addition it is also necessary to be adjusted according to problem specific in reality And correction, so that pump can preferably work, improve pump efficiency.For various types of oil well pump, need to analyze theirs Physical model, studies corresponding mathematical model to be familiar with the feature of various pumps, such that it is able to determine for different oil reservoir situations Required concrete oil well pump.
It should be noted that above the introduction of technical background is intended merely to the convenient technical scheme to the application carry out clear, Complete explanation, and facilitate the understanding of those skilled in the art to illustrate.Can not be merely because these schemes be the application's Background section is set forth and thinks that technique scheme is known to those skilled in the art.
Content of the invention
The purpose of the embodiment of the present application is to provide a kind of force analysis method of oil well pump and device, can be for difference Oil reservoir situation select required for oil well pump.
The force analysis method of a kind of oil well pump that the embodiment of the present application provides and device are realized in：
A kind of force analysis method of oil well pump, described oil well pump includes sucker rod and the post being connected with described sucker rod Plug, described sucker rod can drive described plunger to be moved up and down, and methods described includes：
When calculating described sucker rod and driving described plunger to move upwards, fluid column act on first pressure on described plunger, Second pressure on described plunger for the pressure action of the outlet of described oil well pump and fluid column act on described oil well pump Inertia force on pump barrel；
Calculate the frictional force producing during described sucker rod drives described plunger motion；
Calculating described sucker rod drives liquid during described plunger motion to pass through the valve port of dump valve or inlet valve The resistance producing during valve port and fluid column act on the jacking force on described sucker rod；
During calculating the described sucker rod described plunger motion of drive, the pressure action in described oil well pump is in described plunger On the 3rd pressure and wellhead back pressure act on the 4th pressure on described sucker rod rear surface；
Drive the direction of described plunger motion according to described sucker rod, choose relative with the direction of motion from above-mentioned various power The power answered, and the composite force that described sucker rod lower end is subject to is calculated based on the power chosen.
A kind of force analysis device of oil well pump, described oil well pump includes sucker rod and the post being connected with described sucker rod Plug, described sucker rod can drive described plunger to be moved up and down, and described device includes：
First computing unit, when driving described plunger to move upwards for calculating described sucker rod, fluid column acts on described First pressure on plunger, the second pressure on described plunger for the pressure action of the outlet of described oil well pump and fluid column are made For the inertia force on the pump barrel of described oil well pump；
Second computing unit, for calculating the frictional force producing during described sucker rod drives described plunger motion；
3rd computing unit, passes through dump valve for calculating liquid during described sucker rod drives described plunger motion The resistance producing during the valve port of valve port or inlet valve and fluid column act on the jacking force on described sucker rod；
4th computing unit, during calculating the described sucker rod described plunger motion of drive, in described oil well pump Pressure action acts on the 4th pressure on described sucker rod rear surface in the 3rd pressure on described plunger and wellhead back pressure Power；
Composite force select unit, for driving the direction of described plunger motion according to described sucker rod, from above-mentioned various power The middle selection power corresponding with the direction of motion；
Composite force computing unit, for calculating, based on the power chosen, the composite force that described sucker rod lower end is subject to.
A kind of force analysis method of oil well pump and device that the embodiment of the present application provides, by calculating oil well pump in work When the sucker rod and various power that are subject to of plunger, such that it is able to drive the direction of plunger motion according to sucker rod, select and motion The corresponding power in direction, such that it is able to analyze making a concerted effort suffered by sucker rod lower end.So, the sucker rod being obtained according to analysis Making a concerted effort suffered by lower end, suitable oil well pump can be selected to carry out operation for different oil reservoir situations.
With reference to explanation hereinafter and accompanying drawing, disclose in detail the particular implementation of the application, specify the former of the application Reason can be in adopted mode.It should be understood that presently filed embodiment is not so limited in scope.In appended power In the range of the spirit and terms that profit requires, presently filed embodiment includes many changes, modifications and is equal to.
The feature describing for a kind of embodiment and/or illustrating can be in same or similar mode one or more Use in individual other embodiment, combined with the feature in other embodiment, or substitute the feature in other embodiment.
It should be emphasized that term "comprises/comprising" refers to the presence of feature, one integral piece, step or assembly herein when using, but simultaneously It is not excluded for the presence of one or more further features, one integral piece, step or assembly or additional.
Brief description
Included accompanying drawing is used for providing the embodiment of the present application is further understood from, and which constitutes of description Point, for illustrating presently filed embodiment, and come together to explain the principle of the application with word description.It should be evident that under Accompanying drawing in the description of face is only some embodiments of the present application, for those of ordinary skill in the art, is not paying wound On the premise of the property made is laborious, other accompanying drawings can also be obtained according to these accompanying drawings.In the accompanying drawings：
Fig. 1 is the structural representation that in the embodiment of the present application, a kind of routine oil well pump carries out up-down stroke；
A kind of flow chart of the force analysis method of oil well pump that Fig. 2 provides for the embodiment of the present application；
Fig. 3 is the structural representation that in another embodiment of the application, the second oil well pump carries out up-down stroke；
Fig. 4 is the structural representation that in another embodiment of the application, the 3rd oil well pump carries out up-down stroke；
Fig. 5 is the structural representation that in another embodiment of the application, the 4th oil well pump carries out up-down stroke；
Fig. 6 is the structural representation that in another embodiment of the application, the 5th oil well pump carries out up-down stroke；
A kind of force analysis device of oil well pump that Fig. 7 provides for the application one embodiment.
Specific embodiment
In order that those skilled in the art more fully understand the technical scheme in the application, real below in conjunction with the application Apply the accompanying drawing in example, the enforcement it is clear that described is clearly and completely described to the technical scheme in the embodiment of the present application Example is only some embodiments of the present application, rather than whole embodiments.Based on the embodiment in the application, this area is common All other embodiment that technical staff is obtained under the premise of not making creative work, all should belong to the application protection Scope.
Fig. 1 is the structural representation that in the embodiment of the present application, a kind of routine oil well pump carries out up-down stroke.As shown in figure 1, The plunger that described routine oil well pump can include sucker rod and be connected with described sucker rod, described sucker rod can drive described post Fill in row up and down motion.A kind of flow chart of the force analysis method of oil well pump that Fig. 2 provides for the embodiment of the present application.Although under Literary composition description flow process include with particular order occur multiple operations, but it should be clearly understood that these processes can include more Or less operation, these operations can sequentially execute or executed in parallel (for example using parallel processor or multi-thread environment). As shown in Fig. 2 methods described can include：
S1：When calculating described sucker rod and driving described plunger to move upwards, fluid column acts on the first pressure on described plunger Power, the second pressure on described plunger for the pressure action of the outlet of described oil well pump and fluid column act on described oil well pump Pump barrel on inertia force.
Taking the conventional pumps shown in Fig. 1 as a example, described plunger 3 is in close proximity to the pump barrel wall of described oil well pump 2, described plunger 3 Lower surface offer for supporting the valve port 7 of dump valve 4 and inlet valve 5 is located at the pump barrel diapire of described oil well pump 2, when taking out When beam hanger 1 drives plunger 3 to move upwards, because the space in oil well pump 2 becomes big, pressure is led to reduce, thus inlet valve 5 can quilt Liquid in oil well has rushed upwards, and the liquid in oil well is such that it is able to enter in oil well pump 2.Now, because sucker rod 1 drives post Plug 3 moves upwards, then the upper surface of plunger 3 can be subject to the pressure to it for the fluid column, and this pressure can think described fluid column effect First pressure on described plunger.Additionally, the pressure at the outlet of oil well pump 2 equally can produce to the upper surface of plunger 3 Pressure, this pressure can think described second pressure.Simultaneously as there is fluid column in oil well pump 2, then move in plunger 3 During, also suffer from the inertia force that fluid column acts on the pump barrel of oil well pump 2, this inertia force often stroke with plunger 3 And jig frequency is related.The direction of above-mentioned first pressure, second pressure and inertia force is all downward.Specifically, in the application one In preferred embodiment, first pressure in conventional pumps as shown in Figure 1, second pressure and inertia force can be according to the following equation Represent：
Fhu1+Fl1=Pout1×(Ap1-ArM1), Fl1Act on the first pressure on described plunger 3, F for fluid columnhu1For described Second pressure on described plunger 3 for the pressure action of the outlet of oil well pump 2, Pout1Outlet for described oil well pump 2 Pressure, Ap1For the area of the cross section of described plunger 3, ArM1Area for described sucker rod 1 lower end cross section；
Fl1Act on the first pressure on described plunger 3, S for fluid column1For described Sucker rod 1 drives the stroke that described plunger 3 moves upwards, r1For oil pumping machine crank radius, l1Length of connecting rod for described oil pumper Degree, N1For jig frequency, ε1Coefficient for fluid column acceleration change.
Fig. 3 is the structural representation that in another embodiment of the application, the second oil well pump carries out up-down stroke.As shown in figure 3, In described second oil well pump, plunger 22 is connected with the pump barrel wall 23 of oil well pump, and the pump barrel wall 23 of described oil well pump can be upper and lower Movably it is sheathed on oil pipe 24, inlet valve 26 is located on the upper surface of described oil pipe 24, and dump valve 25 is located at described plunger 22 In.In this embodiment of the application, when sucker rod 21 drives plunger 22 to move upwards, inlet valve 26 can be by the liquid in oil pipe 24 Body has rushed upwards, and dump valve 25 then can block valve port.So, the upper surface of plunger 22 equally can be subject to the first pressure to it for the fluid column Power, the pressure of the outlet of oil well pump equally can produce the second pressure acting on plunger 22 upper surface, the fluid column in oil well pump The inertia force acting on pump barrel similarly can be produced, in this embodiment of the application, above-mentioned first pressure, second pressure with And the direction of inertia force is equally all downward.Described first pressure, second pressure and inertia force can be carried out according to the following equation Represent：
Fhu3+Fl3=Pout3×(Ap3-ArM3), Fl3Act on the first pressure on described plunger 22, F for fluid columnhu3For institute State the second pressure on described plunger 22 for the pressure action of the outlet of oil well pump, Pout3Outlet for described oil well pump Pressure, Ap3For the area of the cross section of described plunger 22, ArM3Area for described sucker rod 21 lower end cross section；
Iu3Act on the inertia on the pump barrel wall 23 of described oil well pump for fluid column Power, Fl3Act on the first pressure on described plunger 22, S for fluid column3Described plunger 22 is driven to transport upwards for described sucker rod 21 Dynamic stroke, r3For oil pumping machine crank radius, l3For the length of connecting rod of described oil pumper, N3For jig frequency, ε3Become for fluid column acceleration The coefficient changed.
Fig. 4 is the structural representation that in another embodiment of the application, the 3rd oil well pump carries out up-down stroke.As shown in figure 4, Described plunger includes upper plug 32 and the lower plunger 33 of T-shaped connection, and the diameter of the cross section of described lower plunger 33 is less than described The diameter of the cross section of upper plug 32, described upper plug 32 is in close proximity to the pump barrel wall 34 of described oil well pump, described lower plunger 33 with Form cavity, described cavity lower end is in the pump barrel of described lower plunger 33 and described oil well pump between the pump barrel wall 34 of described oil well pump It is filled with the seal assembly 35 of preset thickness, described dump valve 36 is located in described upper plug 32, described inlet valve between wall 34 39 are located in described lower plunger 33.In this case, when sucker rod 31 drives plunger to move upwards, the volume of cavity becomes Greatly, thus leading to the pressure in cavity and lower plunger 33 to diminish, liquid can jack-up sucks upwards from the lower end 38 of lower plunger 33 Valve 37, liquid will be entered in cavity and lower plunger 33 by the valve port 39 of inlet valve 37.Upper surface due to upper plug 32 is subject to To fluid column and oil pumping pump discharge pressure active force, now dump valve 36 will block the valve port of dump valve.So, upper prop The upper surface of plug 32 can be subject to the first pressure to it for the fluid column, and the upper surface of upper plug 32 also suffers from the discharge of oil well pump simultaneously Mouthful pressure its second pressure and fluid column are acted on oil well pump pump barrel wall 34 inertia force.Additionally, the liquid in cavity Post also can produce viscous force, therefore, in this embodiment of the application, the force analysis of described oil well pump to the motion of lower plunger 33 Method can also comprise the steps：
When calculating described sucker rod and driving described plunger to move upwards, the fluid column in described cavity acts on described lower plunger On viscous force.
So, in this embodiment of the application, described first pressure, second pressure, inertia force and described viscous force can To calculate according to the following equation：
Fhu5+Fl5=Pout5×(Ap5-ArM5), Fl5Act on the first pressure on described upper plug 32, F for fluid columnhu5For Second pressure on described upper plug 32 for the pressure action of the outlet of described oil well pump, Pout5Discharge for described oil well pump The pressure of mouth, Ap5For the area of the cross section of described upper plug 32, ArM5Area for described sucker rod 31 lower end cross section；
Iu5Act on the inertia on the pump barrel wall 34 of described oil well pump for fluid column Power, Fl5Act on the first pressure on described upper plug 32, S for fluid column5Described plunger is driven to transport upwards for described sucker rod 31 Dynamic stroke, r5For oil pumping machine crank radius, l5For the length of connecting rod of described oil pumper, N5For jig frequency, ε5Become for fluid column acceleration The coefficient changed；
FlpAct on described lower plunger for the fluid column in described cavity Viscous force on 33, L is the length of described lower plunger 33, and K is the inner diameter of described oil pick-up tube and described lower plunger 33 diameter Ratio, μlFor the viscosity of described oil pumping tube fluid, S5Drive the stroke that described plunger moves upwards, N for described sucker rod 315 For jig frequency.
In this embodiment of the application, described first pressure, second pressure, inertia force and described viscous force direction equal Downwards.
Fig. 5 is the structural representation that in another embodiment of the application, the 4th oil well pump carries out up-down stroke.As shown in figure 5, Described plunger includes the upper plug 42 connecting in inverted T shape and lower plunger 43, the cross section of described lower plunger 43 with diameter greater than institute State the diameter of the cross section of upper plug 42, described lower plunger 42 is in close proximity to the pump barrel wall 44 of described oil well pump, described upper plug 42 Form cavity and the pump barrel wall 44 of described oil well pump between, described cavity upper end is in the pump of described upper plug 42 and described oil well pump It is filled with the seal assembly 48 of preset thickness, dump valve 45 is located in described upper plug 42, and inlet valve is located at institute between barrel 44 State on upper plug 42 and the interface of described lower plunger 43.In this case, when sucker rod 41 drives plunger to move upwards, The volume of cavity diminishes, thus leading to pressure in cavity and upper plug 42 to become big, liquid can from punching dump valve 45 and from The valve port 49 of dump valve 45 is discharged.Because the pressure in now cavity and upper plug 42 is larger, therefore inlet valve 46 can be in pressure In the presence of block the valve port of inlet valve.In this case, the upper surface of lower plunger 43 can be subject in cavity and upper plug 42 The first pressure to it for the fluid column, now the pressure of the outlet of oil well pump be delivered to the upper surface of lower plunger 43 by fluid column On, thus the pressure of the outlet of excavationg pump can produce second pressure to the upper surface of lower plunger 43, meanwhile, fluid column in cavity Also inertia force can be produced to the pump barrel wall 44 of oil well pump, the direction of above-mentioned first pressure, second pressure and inertia force is all downward, Can be calculated according to the following equation：
Fl7=ρl7gH7Abp7, Fl7Act on the first pressure on described lower plunger 43, ρ for fluid columnl7For in described oil well pump The density of liquid, Abp7For the area of the cross section of described lower plunger, g is gravity constant, H7For lower-continuous mapping；
Fhu7=Ph7Abp7, Fhu7For the second pressure on described lower plunger for the pressure action of the outlet of described oil well pump, Ph7For wellhead back pressure, Abp7Area for the cross section of described lower plunger；
Iu7Act on the inertia on the pump barrel wall 44 of described oil well pump for fluid column Power, Fl7Act on the first pressure on described lower plunger, S for fluid column7Described sucker rod drives described plunger to move upwards Stroke, r7For oil pumping machine crank radius, l7For the length of connecting rod of described oil pumper, N7For jig frequency, ε7For fluid column acceleration change Coefficient.
Fig. 6 is the structural representation that in another embodiment of the application, the 5th oil well pump carries out up-down stroke.As shown in fig. 6, Described plunger includes the upper plug 52 connecting in inverted T shape and lower plunger 53, the cross section of described lower plunger 53 with diameter greater than institute State the diameter of the cross section of upper plug 52, described lower plunger 53 is in close proximity to the pump barrel wall 54 of described oil well pump, described upper plug 52 Form cavity and the pump barrel wall 54 of described oil well pump between, described cavity upper end is in the pump of described upper plug 52 and described oil well pump It is filled with the seal assembly 510 of preset thickness between barrel 54, in described upper plug 52, be mounted with first order dump valve 58, described It is mounted with second level dump valve 57, inlet valve 55 is located on the pump barrel diapire of described oil well pump in lower plunger 53.In this situation Under, when sucker rod 51 drives plunger to move upwards, although the volume of cavity diminishes, the liquid in cavity can be by logical Hole 59 discharges, thus the pressure maintaining in cavity is constant.And the rising with plunger, positioned at the space of lower plunger 53 lower section Become big, lead to pressure to reduce, the liquid in oil well is such that it is able to washing inlet valve 55 open and entering into from the valve port 56 of inlet valve 55 In oil well pump.So, the upper surface of upper plug 52 equally can be subject to the first pressure to it for the fluid column, and the upper surface of upper plug 52 is also The second pressure to it for the pressure of the outlet of oil well pump can be subject to, also can produce the pump barrel wall that fluid column acts on oil well pump simultaneously On inertia force.Additionally, in this embodiment of the application, the fluid column in cavity also can produce the 7th to the upper surface of lower plunger 53 Pressure, therefore, in this embodiment of the application, the force analysis method of described oil well pump can also comprise the steps：
During calculating the described sucker rod described plunger motion of drive, the fluid column in described cavity acts on described lower plunger On the 7th pressure.
Specifically, in this embodiment of the application, above-mentioned first pressure, second pressure, inertia force and the 7th pressure Can be represented by following formula：
Fhu9+Fl9=Pout9×(Asp9-ArM9), Fl9Act on the first pressure on described upper plug 52, F for fluid columnhu9For Second pressure on described upper plug 52 for the pressure action of the outlet of described oil well pump, Pout9Discharge for described oil well pump The pressure of mouth, Asp9For the area of the cross section of described upper plug 52, ArM9Area for described sucker rod 51 lower end cross section；
Iu9Act on the inertia on the pump barrel wall 54 of described oil well pump for fluid column Power, Fl9Act on the first pressure on described upper plug, S for fluid column9Described sucker rod drives described plunger to move upwards Stroke, r9For oil pumping machine crank radius, l9For the length of connecting rod of described oil pumper, N9For jig frequency, ε9For fluid column acceleration change Coefficient；
Fas=[Pc9+ρl9g(H9-Hd9)](Abp9-Asp9), FasAct on described lower plunger 53 for the fluid column in described cavity On the 7th pressure, Pc9For casing pressure, ρl9For the density of liquid in described oil well pump, Abp9Cross section for described lower plunger Area, g be gravity constant, H9For lower-continuous mapping, Hd9For fluid level depth of oil well, Asp9Cross section for described upper plug Area.
In this embodiment of the application, when sucker rod 51 drives plunger to move downward, the upper surface of lower plunger 53 is same The 7th pressure that the fluid column that can be subject in cavity is applied to it, specifically, when plunger moves downward, described 7th pressure can To be expressed as：
Fas2=[Pc10+ρl9g(H10-Hd10)](Abp9-Asp9), Fas2Act on described lower prop for the fluid column in described cavity The 7th pressure beyond the Great Wall, Pc10For casing pressure, ρl9For the density of liquid in described oil well pump, Abp9Transversal for described lower plunger The area in face, g is gravity constant, H10For lower-continuous mapping, Hd10For fluid level depth of oil well, Asp9Cross section for described upper plug Area.
S2：Calculate the frictional force producing during described sucker rod drives described plunger motion.
In step S1, oil well pumps different to five kinds respectively is analyzed, and will continue this five kinds of oil well pumps are carried out here Analysis.In conventional oil well pump shown in Fig. 1, plunger 3 can produce friction with the pump barrel wall of oil well pump in motor process, and this rubs Wiping power can be expressed as：
FpFor the frictional force producing between described plunger 3 and described pump barrel wall, dpFor described The diameter of plunger, deGap for described plunger and described pump barrel wall.
When plunger 3 moves upwards, the direction of described frictional force is downward；When plunger 3 moves downward, described frictional force Direction is upwards.
In second oil well pump as shown in Figure 3 of another embodiment of the application, plunger 22, in motor process, can drive There is relative displacement in the pump barrel wall 23 of oil well pump and oil pipe 24, thus producing frictional force.In this embodiment of the application, described pump Frictional force between barrel 23 and oil pipe 24 can be expressed as：
FptFor the frictional force between described pump barrel wall 23 and described oil pipe 24, dp3For institute State the diameter of plunger 22, de3Gap for described pump barrel wall 23 and described oil pipe 24.
In the 3rd oil well pump as shown in Figure 4 of another embodiment of the application, plunger in motor process, upper plug 32 Produce frictional force between the pump barrel wall 34 of meeting and oil well pump, between lower plunger 33 meeting and seal assembly 35, produce frictional force simultaneously. In this embodiment of the application, this two frictional force specifically can be expressed as：
Fp1For the frictional force producing between described upper plug and described pump barrel wall, ddpFor The diameter of described upper plug, de5Gap for described upper plug and described pump barrel wall；
Fp2For the frictional force producing between described lower plunger and described seal assembly, dsp For the diameter of described lower plunger, de6Gap for described lower plunger and described seal assembly.
In the 4th oil well pump as shown in Figure 5 of another embodiment of the application, plunger in motor process, lower plunger 43 Produce frictional force between the pump barrel wall 44 of meeting and oil well pump, between upper plug 42 meeting and seal assembly 48, produce frictional force simultaneously. In this embodiment of the application, this two frictional force specifically can be expressed as：
Fp7For the frictional force producing between described lower plunger and described pump barrel wall, dbp7 For the diameter of described lower plunger, de7Gap for described lower plunger and described pump barrel wall；
Fp8For between described upper plug and described seal assembly produce frictional force, dsp7For the diameter of described upper plug, de8Gap for described upper plug and described seal assembly.
In the 5th oil well pump as shown in Figure 6 of another embodiment of the application, plunger in motor process, lower plunger 53 Produce frictional force between the pump barrel wall 54 of meeting and oil well pump, between upper plug 52 meeting and seal assembly 510, produce frictional force simultaneously. In this embodiment of the application, this two frictional force specifically can be expressed as：
Fp9For the frictional force producing between described lower plunger and described pump barrel wall, dbp9 For the diameter of described lower plunger, de9Gap for described lower plunger and described pump barrel wall；
FpsFor between described upper plug and described seal assembly produce frictional force, dsp9For the diameter of described upper plug, de10Gap for described upper plug and described seal assembly.
S3：Calculating described sucker rod drives liquid during described plunger motion to pass through valve port or the inlet valve of dump valve Valve port when the resistance that produces and fluid column act on the jacking force on described sucker rod.
During sucker rod drives plunger motion, according to the difference of the direction of motion, inlet valve or dump valve can be caused Open or close, thus lead to liquid flow through the valve port of dump valve or inlet valve valve port when can produce resistance, in addition, When sucker rod moves, the fluid column in oil well pump can cause jacking force to sucker rod.
In the application one embodiment conventional oil well pump as shown in Figure 1, when sucker rod 1 drives plunger 3 to move downward, Because the space in oil well pump diminishes, cause pressure to become big, so that the valve port 6 of inlet valve blocked by inlet valve 5, and pump Liquid in pump can be washed dump valve 4 open and pass through valve port 7, will produce resistance to plunger when liquid passes through valve port 7.Meanwhile, Liquid in oil well pump can produce jacking force to the lower end of sucker rod.In this embodiment of the application, described resistance and described top Towing force can be expressed as：
Fbv1Produce during for liquid by the valve port of described dump valve Resistance, ρl1For the density of liquid in described oil well pump, f02For supporting the area of passage of the valve port of described dump valve, Ap1For described The area of the cross section of plunger, S2The stroke moving downward for the described sucker rod described plunger of drive, N2For jig frequency, μ2For described The discharge coefficient of dump valve；
For1=Pout1×ArM1, For1Act on the jacking force on described sucker rod, P for fluid columnout1For described oil well pump The pressure of outlet, ArM1Area for described sucker rod lower end cross section.
In another embodiment of the application the second oil well pump as shown in Figure 3, plunger 22 is driven to transport downwards in sucker rod 21 When dynamic, equally can be subject to resistance when the valve port 28 of dump valve 25 for the liquid and the liquid in oil well pump to sucker rod 21 Jacking force.In this embodiment of the application, described resistance can be expressed as with described jacking force：
Fbv4Produce during for liquid by the valve port of described dump valve Resistance, ρl3For the density of liquid in described oil well pump, f04For supporting the area of passage of the valve port of described dump valve, Ap3For described The area of the cross section of plunger, S4The stroke moving downward for the described sucker rod described plunger of drive, N4For jig frequency, μ4For described The discharge coefficient of dump valve；
For4=Pout4×ArM3, For4Act on the jacking force on described sucker rod, P for fluid columnout4For described oil well pump The pressure of outlet, ArM3Area for described sucker rod lower end cross section.
In another embodiment of the application the 3rd oil well pump as shown in Figure 4, plunger is driven to move downward in sucker rod 31 When, equally can be subject to resistance when the valve port 310 of dump valve 36 for the liquid and the liquid in oil well pump to sucker rod 31 Jacking force.In this embodiment of the application, described resistance can be expressed as with described jacking force：
Fbv5Produce during for liquid by the valve port of described dump valve Resistance, ρl5For the density of liquid in described oil well pump, Asp5For the area of the cross section of described lower plunger, f06For supporting described row Go out the area of passage of the valve port of valve, S6The stroke moving downward for the described sucker rod described plunger of drive, N6For jig frequency, μ6For institute State the discharge coefficient of dump valve；
For5=Pout5×ArM5, For5Act on the jacking force on described sucker rod, P for fluid columnout5For described oil well pump The pressure of outlet, ArM5Area for described sucker rod lower end cross section.
Further, since inlet valve 37 is located in lower plunger 33, therefore when sucker rod 31 drives plunger to move downward, cavity Liquid in interior and lower plunger 33 can cause the 5th pressure to inlet valve 37, the oil well pump described in this embodiment of the application In force analysis method, methods described also comprises the steps：
When calculating described sucker rod and driving described plunger to move downward, the inlet valve in described lower plunger be subject to the Five pressure.
Specifically, the 5th pressure can be expressed as：
Ffk=(Ph5+ρl5gH)×Asp5, FfkIt is the 5th pressure that the inlet valve in described lower plunger is subject to, Ph5For Wellhead back pressure, ρl5For the density of liquid in described oil well pump, g is gravity constant, and H is lower-continuous mapping, Asp5For described lower plunger The area of cross section.
5th pressure is contrary with the direction of above-mentioned resistance and jacking force.
In another embodiment of the application the 4th oil well pump as shown in Figure 5, plunger is driven to move upwards in sucker rod 41 When, diminishing because hollow cavity interiors amass, leading to pressure to become big, thus leading to dump valve 45 to be washed open by liquid, liquid flows through dump valve 45 valve port 49.So, plunger can be flow through the resistance the producing during valve port 49 and liquid jacking to sucker rod 41 by liquid Power.Described resistance and described jacking force specifically can be expressed as：
Fbv7Produce during for liquid by the valve port of described dump valve Resistance, ρl7For the density of liquid in described oil well pump, Asp7For the area of the cross section of described upper plug, f07For supporting described row Go out the area of passage of the valve port of valve, S7The stroke moving upwards for the described sucker rod described plunger of drive, N7For jig frequency, μ7For institute State the discharge coefficient of dump valve；
For7=Pout7×ArM7, For7Act on the jacking force on described sucker rod, P for fluid columnout7For described oil well pump The pressure of outlet, ArM7Area for described sucker rod lower end cross section.
When sucker rod 41 drives plunger to move downward, become big because hollow cavity interiors amass, thus leading to liquid can wash open Inlet valve 46 and flow through inlet valve valve port 47 enter upper plug 42 in, and dump valve 45 oil pumping pump discharge pressure under meeting Block the valve port 49 of dump valve.In this case, described dump valve 45 by by pump the pressure action of pump discharge and its On the 6th pressure.Therefore, in this embodiment of the application, the force analysis method of described oil well pump is further comprising the steps of：
When calculating described sucker rod and driving described plunger to move downward, the dump valve in described upper plug be subject to the Six pressure.
Specifically, described 6th pressure can be expressed as：
Fout=Pout8×(Asp7-ArM7), FoutIt is the 6th pressure that the dump valve in described upper plug is subject to, Pout8 For the pressure of the outlet of described oil well pump, Asp7For the area of the cross section of described upper plug, ArM7For described sucker rod lower end The area of cross section.
In another embodiment of the application the 5th oil well pump as shown in Figure 6, plunger is driven to move downward in sucker rod 51 When, plunger can be by hindering that liquid at the valve port 511 of the valve port 512 of first order dump valve 58 and second level dump valve 57 flows through The power sum and liquid jacking force to sucker rod 51.Specifically, described resistance sum and jacking force can be expressed as：
Fbv10For liquid The resistance sum producing when body is by the valve port of the valve port of described first order dump valve and described second level dump valve, ρl9For institute State the density of liquid in oil well pump, Abp9For the area of the cross section of described lower plunger, g is gravity constant, f010Described for supporting The area of passage of the valve port of second level dump valve, S10The stroke moving upwards for the described sucker rod described plunger of drive, N10For punching Secondary, μ10For the discharge coefficient of described second level dump valve, Asp9For the area of the cross section of described upper plug, μ11For described first The discharge coefficient of level dump valve, f011For supporting the area of passage of the valve port of described first order dump valve；
For10=Pout10×ArM9, For10Act on the jacking force on described sucker rod, P for fluid columnout10For described oil well pump Outlet pressure, ArM9Area for described sucker rod lower end cross section.
S4：During calculating the described sucker rod described plunger motion of drive, the pressure action in described oil well pump is in described The 3rd pressure on plunger and wellhead back pressure act on the 4th pressure on described sucker rod rear surface.
Drive in the motor process of plunger in sucker rod, the pressure in oil well pump can act on described plunger and produce the Three pressure, the wellhead back pressure of oil well also can produce the 4th pressure to the rear surface of sucker rod.
In the application one embodiment conventional oil well pump as shown in Figure 1, when sucker rod 1 drives plunger 3 to move upwards, Liquid in oil well pump can produce the 3rd pressure to the lower surface of plunger 3.Specifically, the 3rd pressure can be expressed as：
Fi1For described oil pumping 3rd pressure on described plunger for the pressure action in pump, Pc1For casing pressure, ρl1For in described oil well pump liquid close Degree, Ap1For the area of the cross section of described plunger, g is gravity constant, H1For lower-continuous mapping, Hd1For fluid level depth of oil well, f01 For supporting the area of passage of the valve port of described inlet valve, S1The stroke moving upwards for the described sucker rod described plunger of drive, N1For Jig frequency, μ1Discharge coefficient for described inlet valve.
When sucker rod 1 drives plunger 3 to move downward, the wellhead back pressure of oil well can produce to the rear surface of sucker rod 1 4th pressure.Specifically, described 4th pressure can be expressed as：
Fhd1=Ph1ArM1, Fhd1Act on the 4th pressure on described sucker rod rear surface, P for wellhead back pressureh1For well Mouth back pressure, ArM1Area for described sucker rod lower end cross section.
In another embodiment of the application the second oil well pump as shown in Figure 3, when sucker rod 21 drives plunger 22 to transport upwards When dynamic, the liquid in oil well pump can produce the 3rd pressure to the lower surface of plunger 22.Specifically, the 3rd pressure can represent For：
Fi3For described oil pumping 3rd pressure on described plunger for the pressure action in pump, Pc3For casing pressure, ρl3For in described oil well pump liquid close Degree, Ap3For the area of the cross section of described plunger, g is gravity constant, H3For lower-continuous mapping, Hd3For fluid level depth of oil well, f03 For supporting the area of passage of the valve port of described inlet valve, S3The stroke moving upwards for the described sucker rod described plunger of drive, N3For Jig frequency, μ3Discharge coefficient for described inlet valve.
When sucker rod 21 drives plunger 22 to move downward, the wellhead back pressure of oil well can produce to the rear surface of sucker rod 21 Raw 4th pressure.Specifically, described 4th pressure can be expressed as：
Fhd4=Ph4ArM3, Fhd4Act on the 4th pressure on described sucker rod rear surface, P for wellhead back pressureh4For well Mouth back pressure, ArM3Area for described sucker rod lower end cross section.
In another embodiment of the application the 3rd oil well pump as shown in Figure 4, when sucker rod 31 drives plunger to move upwards When, the liquid in oil well pump can produce the 3rd pressure to the lower surface of lower plunger 32.The lower surface of lower plunger 32 can be managed herein Solve the supporting surface for inlet valve 37.Specifically, the 3rd pressure can be expressed as：
Fi5Take out for described 3rd pressure on described lower plunger for the pressure action in oil pump, Pc5For casing pressure, ρl5For liquid in described oil well pump Density, Asp5For the area of the cross section of described lower plunger, g is gravity constant, H5For lower-continuous mapping, Hd5Deep for well fluid level Degree, f05For supporting the area of passage of the valve port of described inlet valve, S5For rushing that the described sucker rod described plunger of drive moves upwards Journey, N5For jig frequency, μ5Discharge coefficient for described inlet valve.
When sucker rod 31 drives plunger to move downward, the pressure in oil well pump equally can produce to the lower surface of upper plug 32 Raw 3rd pressure, meanwhile, the wellhead back pressure of oil well can produce the 4th pressure to the rear surface of sucker rod 31.Specifically, described 3rd pressure and the 4th pressure can be expressed as：
Fi6For described oil pumping 3rd pressure on described upper plug for the pressure action in pump, Pc6For casing pressure, ρl5For in described oil well pump liquid close Degree, Asp5For the area of the cross section of described lower plunger, g is gravity constant, H6For lower-continuous mapping, Hd6For fluid level depth of oil well, f06For supporting the area of passage of the valve port of described dump valve, S6The stroke moving downward for the described sucker rod described plunger of drive, N6For jig frequency, μ6Discharge coefficient for described dump valve；
Fhd5=Ph5ArM5, Fhd5Act on the 4th pressure on described sucker rod rear surface, P for wellhead back pressureh5For well Mouth back pressure, ArM5Area for described sucker rod lower end cross section.
In another embodiment of the application the 4th oil well pump as shown in Figure 5, when sucker rod 41 drives plunger to move upwards When, the liquid in oil well pump can produce the 3rd pressure to the lower surface of upper plug 42.The lower surface of upper plug 42 can be managed herein Solve the supporting surface for dump valve 45.Specifically, the 3rd pressure can be expressed as：
Fi7Take out for described 3rd pressure on described upper plug for the pressure action in oil pump, Pc7For casing pressure, ρl7For liquid in described oil well pump Density, g is gravity constant, H7For lower-continuous mapping, Hd7For fluid level depth of oil well, Asp7Face for the cross section of described upper plug Long-pending, f07For supporting the area of passage of the valve port of described dump valve, S7For rushing that the described sucker rod described plunger of drive moves upwards Journey, N7For jig frequency, μ7Discharge coefficient for described dump valve.
In another embodiment of the application the 5th oil well pump as shown in Figure 6, when sucker rod 51 drives plunger to move upwards When, the liquid in oil well pump can produce the 3rd pressure to the lower surface of lower plunger 53.Specifically, the 3rd pressure can represent For：
Fi9Take out for described 3rd pressure on described lower plunger for the pressure action in oil pump, Pc9For casing pressure, ρl9For liquid in described oil well pump Density, Abp9For the area of the cross section of described lower plunger, g is gravity constant, H9For lower-continuous mapping, Hd9Deep for well fluid level Degree, f09For supporting the area of passage of the valve port of described inlet valve, S9For rushing that the described sucker rod described plunger of drive moves upwards Journey, N9For jig frequency, μ9Discharge coefficient for described inlet valve.
When sucker rod 51 drives plunger to move downward, the wellhead back pressure of oil well can produce to the rear surface of sucker rod 51 4th pressure.Specifically, described 4th pressure can be expressed as：
Fhd10=Ph10ArM9, Fhd10Act on the 4th pressure on described sucker rod rear surface, P for wellhead back pressureh10For Wellhead back pressure, ArM9Area for described sucker rod lower end cross section.
S5：Drive the direction of described plunger motion according to described sucker rod, choose and the direction of motion from above-mentioned various power Corresponding power, and the composite force that described sucker rod lower end is subject to is calculated based on the power chosen.
From the analysis of step S1 to S4 as can be seen that drive the difference in plunger motion direction, described plunger according to sucker rod The power being subject to also can be different.The embodiment of the present application can drive the direction of described plunger motion according to described sucker rod, from above-mentioned The power corresponding with the direction of motion is chosen in various power, and based on synthesizing that the described sucker rod lower end of power calculating chosen is subject to Power.Because sucker rod lower end is connected with plunger, composite force that therefore sucker rod lower end is subject to herein can be considered as sucker rod with The composite force that plunger is integrally subject to.
Specifically, in the application one embodiment conventional oil well pump as shown in Figure 1, when sucker rod 1 drives plunger 3 upwards During motion, calculate the composite force that described sucker rod 1 lower end is subject to according to the following equation：
Fr1=Fl1+Fhu1+Fp+Iu1-Fi1
Wherein, Fr1The composite force being subject to for described sucker rod lower end, Fl1Act on the first pressure on described plunger for fluid column Power, Fhu1For the second pressure on described plunger for the pressure action of the outlet of described oil well pump, FpFor described plunger with described The frictional force producing between pump barrel wall, Iu1Act on the inertia force on the pump barrel of described oil well pump, F for fluid columni1For described oil pumping 3rd pressure on described plunger for the pressure action in pump；
When described sucker rod 1 drives described plunger 3 to move downward, calculate described sucker rod 1 lower end according to the following equation The composite force being subject to：
Fr2=Fp+Fbv1+Fhd1+For1
Wherein, Fr2The composite force being subject to for described sucker rod lower end, FpProduce between described plunger and described pump barrel wall Frictional force, Fbv1The resistance producing during for liquid by the valve port of described dump valve, Fhd1Act on described oil pumping for wellhead back pressure The 4th pressure on bar rear surface, For1Act on the jacking force on described sucker rod for fluid column.
In the application one embodiment the second oil well pump as shown in Figure 3, when sucker rod 21 drives plunger 22 to move upwards When, calculate the composite force that described sucker rod 21 lower end is subject to according to the following equation：
Fr3=Fl3+Fhu3+Iu3+Fpt-Fi3
Wherein, Fr3The composite force being subject to for described sucker rod lower end, Fl3Act on the first pressure on described plunger for fluid column Power, Fhu3For the second pressure on described plunger for the pressure action of the outlet of described oil well pump, FptFor described pump barrel wall and institute State the frictional force between oil pipe, Iu3Act on the inertia force on the pump barrel of described oil well pump, F for fluid columni3For in described oil well pump The 3rd pressure on described plunger for the pressure action；
When described sucker rod 21 drives described plunger 22 to move downward, calculate according to the following equation under described sucker rod 21 Hold the composite force being subject to：
Fr4=Fpt+Fbv4+Fhd4+For4
Wherein, Fr4The composite force being subject to for described sucker rod lower end, FptFriction between described pump barrel wall and affiliated oil pipe Power, Fbv4The resistance producing during for liquid by the valve port of described dump valve, Fhd4Act under described sucker rod for wellhead back pressure The 4th pressure on end surfaces, For4Act on the jacking force on described sucker rod for fluid column.
In the application one embodiment the 3rd oil well pump as shown in Figure 4, when sucker rod 31 drives plunger to move upwards, Calculate the composite force that described sucker rod 31 lower end is subject to according to the following equation：
Fr5=Fl5+Fhu5+Iu5+Fp1+Fp2+Flp-Fi5
Wherein, Fr5The composite force being subject to for described sucker rod lower end, Fl5Act on first on described upper plug for fluid column Pressure, Fhu5For the second pressure on described upper plug for the pressure action of the outlet of described oil well pump, Fp1For described upper plug The frictional force producing and described pump barrel wall between, Fp2For the frictional force producing between described lower plunger and described seal assembly, Iu5 Act on the inertia force on the pump barrel of described oil well pump, F for fluid columnlpAct on described lower plunger for the fluid column in described cavity Viscous force, Fi5For the 3rd pressure on described lower plunger for the pressure action in described oil well pump；
When described sucker rod 31 drives described plunger to move downward, calculate described sucker rod 31 lower end according to the following equation The composite force being subject to：
Fr6=Fi6+Fp1+Fp2+Fbv5+Fhd5+For5-Ffk
Wherein, Fr6The composite force being subject to for described sucker rod lower end, Fi6For the pressure action in described oil well pump in described The 3rd pressure on upper plug, Fp1For the frictional force producing between described upper plug and described pump barrel wall, Fp2For described lower plunger The frictional force producing and described seal assembly between, Fbv5The resistance producing during for liquid by the valve port of described dump valve, Fhd5 Act on the 4th pressure on described sucker rod rear surface, F for wellhead back pressureor5Act on described sucker rod for fluid column Jacking force, FfkIt is the 5th pressure that the inlet valve in described lower plunger is subject to.
In the application one embodiment the 4th oil well pump as shown in Figure 5, when sucker rod 41 drives described plunger to transport upwards When dynamic, calculate the composite force that described sucker rod 41 lower end is subject to according to the following equation：
Fr7=Fl7+Fhu7+Iu7+Fp7+Fp8+Fbv7-For7-Fi7
Wherein, Fr7The composite force being subject to for described sucker rod lower end, Fl7Act on first on described lower plunger for fluid column Pressure, Fhu7For the second pressure on described lower plunger for the pressure action of the outlet of described oil well pump, Fp7For described lower plunger The frictional force producing and described pump barrel wall between, Fp8For the frictional force producing between described upper plug and described seal assembly, Iu7 Act on the inertia force on the pump barrel wall of described oil well pump, F for fluid columnbv7Produce during the valve port passing through described dump valve for liquid Resistance, For7Act on the jacking force on described sucker rod, F for fluid columni7For the pressure action in described oil well pump on described The 3rd pressure on plunger；
When described sucker rod 41 drives described plunger to move downward, calculate described sucker rod lower end according to the following equation and be subject to The composite force arriving：
Fr8=Fi8+Fp7+Fp8+Fout
Wherein, Fr8The composite force being subject to for described sucker rod lower end, Fi8For the pressure action in described oil well pump in described The 3rd pressure on lower plunger, Fp7For the frictional force producing between described lower plunger and described pump barrel wall, Fp8For described upper plug The frictional force producing and described seal assembly between, FoutIt is the 6th pressure that the dump valve in described upper plug is subject to.
In the application one embodiment the 5th oil well pump as shown in Figure 6, when sucker rod 51 drives described plunger to transport upwards When dynamic, calculate the composite force that described sucker rod 51 lower end is subject to according to the following equation：
Fr9=Fl9+Fhu9+Iu9+Fp9+Fps+Fas-Fi9
Wherein, Fr9The composite force being subject to for described sucker rod lower end, Fl9Act on first on described upper plug for fluid column Pressure, Fhu9For the second pressure on described upper plug for the pressure action of the outlet of described oil well pump, Fp9For described lower plunger The frictional force producing and described pump barrel wall between, FpsFor the frictional force producing between described upper plug and described seal assembly, Fas Act on the 7th pressure on described lower plunger, I for the fluid column in described cavityu9Act on the pump barrel of described oil well pump for fluid column Inertia force on wall, Fi9For the 3rd pressure on described lower plunger for the pressure action in described oil well pump；
When described sucker rod 51 drives described plunger to move downward, calculate described sucker rod 51 lower end according to the following equation The composite force being subject to：
Fr10=Fp9+Fhd10+Fps+Fbv10+For10-Fas2
Wherein, Fr10The composite force being subject to for described sucker rod lower end, Fp9Produce between described lower plunger and described pump barrel wall Frictional force, FpsFor the frictional force producing between described upper plug and described seal assembly, Fbv10Pass through described first for liquid The resistance sum producing during the valve port of the valve port of level dump valve and described second level dump valve, Fhd10Act on for wellhead back pressure The 4th pressure on described sucker rod rear surface, For10Act on the jacking force on described sucker rod, F for fluid columnas2For described Fluid column in cavity acts on the 7th pressure on described lower plunger.
The embodiment of the present application also provides a kind of force analysis device of oil well pump.Described oil well pump include sucker rod and with The plunger that described sucker rod is connected, described sucker rod can drive described plunger to be moved up and down.Fig. 7 is the application one embodiment A kind of force analysis device of the oil well pump providing.As shown in fig. 7, described device includes：
First computing unit 100, when driving described plunger to move upwards for calculating described sucker rod, fluid column acts on institute State the pressure action of first pressure on plunger, the outlet of the described oil well pump second pressure on described plunger and fluid column Act on the inertia force on the pump barrel of described oil well pump；
Second computing unit 200, for calculating the frictional force producing during described sucker rod drives described plunger motion；
3rd computing unit 300, passes through to discharge for calculating liquid during described sucker rod drives described plunger motion The resistance producing during the valve port of the valve port of valve or inlet valve and fluid column act on the jacking force on described sucker rod；
4th computing unit 400, during calculating the described sucker rod described plunger motion of drive, in described oil well pump Pressure action act on the on described sucker rod rear surface the 4th in the 3rd pressure on described plunger and wellhead back pressure Pressure；
Composite force select unit 500, for driving the direction of described plunger motion according to described sucker rod, from above-mentioned various The power corresponding with the direction of motion is chosen in power；
Composite force computing unit 600, for calculating, based on the power chosen, the composite force that described sucker rod lower end is subject to.
Specifically, the force analysis device that the embodiment of the present application provides can accordingly arrange pin with step S1 to S5 Computing unit to each oil well pump, the computing formula being applied in described computing unit all with the public affairs that are related in step S1 to S5 Formula is identical, repeats no more here.
A kind of force analysis method of oil well pump and device that the embodiment of the present application provides, by calculating oil well pump in work When the sucker rod and various power that are subject to of plunger, such that it is able to drive the direction of plunger motion according to sucker rod, select and motion The corresponding power in direction, such that it is able to analyze making a concerted effort suffered by sucker rod lower end.So, the sucker rod being obtained according to analysis Making a concerted effort suffered by lower end, suitable oil well pump can be selected to carry out operation for different oil reservoir situations.
Description to the various embodiments of the application is supplied to those skilled in the art with the purpose describing above.It is not Be intended to exhaustion or be not intended to limit the invention to single disclosed embodiment.As described above, the application's is various Substitute and change will be apparent from for above-mentioned technology one of ordinary skill in the art.Therefore although specifically begging for Discuss the embodiment of some alternatives, but other embodiment will be apparent from, or those skilled in the art are relatively Easily draw.This society loving-kindness is intended to be included in this all replacement of the present invention having discussed, modification and change, Yi Jiluo Other embodiment in the spirit and scope of above-mentioned application.

Claims (9)

1. a kind of force analysis method of oil well pump, described oil well pump includes sucker rod and the post being connected with described sucker rod Plug, described sucker rod can drive described plunger to be moved up and down it is characterised in that methods described includes：
When calculating described sucker rod and driving described plunger to move upwards, fluid column acts on first pressure on described plunger, described Second pressure on described plunger for the pressure action of the outlet of oil well pump and fluid column act on the pump barrel of described oil well pump On inertia force；
Calculate the frictional force producing during described sucker rod drives described plunger motion；
Calculate liquid during described sucker rod drives described plunger motion and pass through the valve port of dump valve or the valve port of inlet valve When the resistance that produces and fluid column act on the jacking force on described sucker rod；
During calculating the described sucker rod described plunger motion of drive, the pressure action in described oil well pump is on described plunger 3rd pressure and wellhead back pressure act on the 4th pressure on described sucker rod rear surface；
Drive the direction of described plunger motion according to described sucker rod, choose corresponding with the direction of motion from above-mentioned various power Power, and the composite force that described sucker rod lower end is subject to is calculated based on the power chosen；
Wherein, it is in close proximity to the pump barrel wall of described oil well pump in described plunger, the lower surface of described plunger offers for the row of support Go out the valve port of valve and in the case that inlet valve is located on the pump barrel diapire of described oil well pump；
When described sucker rod drives described plunger to move upwards, calculate that described sucker rod lower end is subject to according to the following equation closes Cheng Li：
Fr1=Fl1+Fhu1+Fp+Iu1-Fi1
Wherein, Fr1The composite force being subject to for described sucker rod lower end, Fl1Act on the first pressure on described plunger for fluid column, Fhu1For the second pressure on described plunger for the pressure action of the outlet of described oil well pump, FpFor described plunger and described pump The frictional force producing between barrel, Iu1Act on the inertia force on the pump barrel of described oil well pump, F for fluid columni1For described oil well pump 3rd pressure on described plunger for the interior pressure action；
Wherein,
Fhu1+Fl1=Pout1×(Ap1-ArM1), Pout1For the pressure of the outlet of described oil well pump, Ap1Transversal for described plunger The area in face, ArM1Area for described sucker rod lower end cross section；
dpFor the diameter of described plunger, deGap for described plunger and described pump barrel wall；
Fl1Act on the first pressure on described plunger, S for fluid column1For described sucker rod Drive the stroke that described plunger moves upwards, r1For oil pumping machine crank radius, l1For the length of connecting rod of described oil pumper, N1For punching Secondary, ε1Coefficient for fluid column acceleration change；
Pc1For casing pressure, ρl1For The density of liquid, A in described oil well pumpp1For the area of the cross section of described plunger, g is gravity constant, H1For lower-continuous mapping, Hd1 For fluid level depth of oil well, f01For supporting the area of passage of the valve port of described inlet valve, S1Drive described post for described sucker rod Fill in the stroke moving upwards, N1For jig frequency, μ1Discharge coefficient for described inlet valve；
When described sucker rod drives described plunger to move downward, calculate that described sucker rod lower end is subject to according to the following equation closes Cheng Li：
Fr2=Fp+Fbv1+Fhd1+For1
Wherein, Fr2The composite force being subject to for described sucker rod lower end, FpThe friction producing between described plunger and described pump barrel wall Power, Fbv1The resistance producing during for liquid by the valve port of described dump valve, Fhd1Act under described sucker rod for wellhead back pressure The 4th pressure on end surfaces, For1Act on the jacking force on described sucker rod for fluid column；
Wherein,
dpFor the diameter of described plunger, deGap for described plunger and described pump barrel wall；
Fhd1=Ph1ArM1, Ph1For wellhead back pressure, ArM1Area for described sucker rod lower end cross section；
ρl1For the density of liquid in described oil well pump, f02For supporting described discharge The area of passage of the valve port of valve, Ap1For the area of the cross section of described plunger, S2Drive described plunger downward for described sucker rod The stroke of motion, N2For jig frequency, μ2Discharge coefficient for described dump valve；
For1=Pout1×ArM1, Pout1For the pressure of the outlet of described oil well pump, ArM1For described sucker rod lower end cross section Area.
2. as claimed in claim 1 a kind of force analysis method of oil well pump it is characterised in that taking out with described in described plunger The pump barrel wall of oil pump is connected, and the pump barrel wall of described oil well pump can be sheathed on oil pipe up or down, and inlet valve is located at described On the upper surface of oil pipe, in the case that dump valve is located in described plunger, during described sucker rod drives described plunger motion The frictional force producing is the frictional force between described pump barrel wall and described oil pipe；
Correspondingly, when described sucker rod drives described plunger to move upwards, calculate described sucker rod lower end according to the following equation The composite force being subject to：
Fr3=Fl3+Fhu3+Iu3+Fpt-Fi3
Wherein, Fr3The composite force being subject to for described sucker rod lower end, Fl3Act on the first pressure on described plunger for fluid column, Fhu3For the second pressure on described plunger for the pressure action of the outlet of described oil well pump, FptFor described pump barrel wall with described Frictional force between oil pipe, Iu3Act on the inertia force on the pump barrel of described oil well pump, F for fluid columni3For in described oil well pump 3rd pressure on described plunger for the pressure action；
Wherein,
Fhu3+Fl3=Pout3×(Ap3-ArM3), Pout3For the pressure of the outlet of described oil well pump, Ap3Transversal for described plunger The area in face, ArM3Area for described sucker rod lower end cross section；
dp3For the diameter of described plunger, de3Gap for described pump barrel wall and described oil pipe；
Fl3Act on the first pressure on described plunger, S for fluid column3For described sucker rod Drive the stroke that described plunger moves upwards, r3For oil pumping machine crank radius, l3For the length of connecting rod of described oil pumper, N3For punching Secondary, ε3Coefficient for fluid column acceleration change；
Pc3For casing pressure, ρl3For The density of liquid, A in described oil well pumpp3For the area of the cross section of described plunger, g is gravity constant, H3For lower-continuous mapping, Hd3 For fluid level depth of oil well, f03For supporting the area of passage of the valve port of described inlet valve, S3Drive described post for described sucker rod Fill in the stroke moving upwards, N3For jig frequency, μ3Discharge coefficient for described inlet valve；
When described sucker rod drives described plunger to move downward, calculate that described sucker rod lower end is subject to according to the following equation closes Cheng Li：
Fr4=Fpt+Fbv4+Fhd4+For4
Wherein, Fr4The composite force being subject to for described sucker rod lower end, FptFor the frictional force between described pump barrel wall and described oil pipe, Fbv4The resistance producing during for liquid by the valve port of described dump valve, Fhd4Act on described sucker rod lower end table for wellhead back pressure The 4th pressure on face, For4Act on the jacking force on described sucker rod for fluid column；
Wherein,
dp3For the diameter of described plunger, de3Gap for described pump barrel wall and described oil pipe；
Fhd4=Ph4ArM3, Ph4For wellhead back pressure, ArM3Area for described sucker rod lower end cross section；
ρl3For the density of liquid in described oil well pump, f04For supporting described row Go out the area of passage of the valve port of valve, Ap3For the area of the cross section of described plunger, S4For described sucker rod drive described plunger to The stroke of lower motion, N4For jig frequency, μ4Discharge coefficient for described dump valve；
For4=Pout4×ArM3, Pout4For the pressure of the outlet of described oil well pump, ArM3For described sucker rod lower end cross section Area.
3. as claimed in claim 1 a kind of force analysis method of oil well pump it is characterised in that including in T in described plunger Upper plug and lower plunger that type connects, the diameter of the cross section of described lower plunger is less than the diameter of the cross section of described upper plug, Described upper plug is adjacent with the pump barrel wall of described oil well pump, is formed empty between the pump barrel wall of described lower plunger and described oil well pump Chamber, described cavity lower end is filled with the seal assembly of preset thickness between the pump barrel wall of described lower plunger and described oil well pump, Described dump valve be located at described upper plug in and described inlet valve be located at described lower plunger in the case of, taken out according to described Beam hanger drives the direction of described plunger motion, chooses the power corresponding with the direction of motion from above-mentioned various power, and based on selection Power calculate the step of composite force that is subject to of described sucker rod lower end before, methods described also includes：
When calculating described sucker rod and driving described plunger to move upwards, the fluid column in described cavity acts on described lower plunger Viscous force；
When calculating described sucker rod and driving described plunger to move downward, the 5th pressure that the inlet valve in described lower plunger is subject to Power.
4. as claimed in claim 3 a kind of force analysis method of oil well pump it is characterised in that described sucker rod drive described During plunger motion produce frictional force at least include between described upper plug and the pump barrel wall of described oil well pump produce rub The frictional force producing between wiping power and described lower plunger and described seal assembly；
Correspondingly, when described sucker rod drives described plunger to move upwards, calculate described sucker rod lower end according to the following equation The composite force being subject to：
Fr5=Fl5+Fhu5+Iu5+Fp1+Fp2+Flp-Fi5
Wherein, Fr5The composite force being subject to for described sucker rod lower end, Fl5Act on the first pressure on described upper plug for fluid column, Fhu5For the second pressure on described upper plug for the pressure action of the outlet of described oil well pump, Fp1For described upper plug and institute State the frictional force producing between pump barrel wall, Fp2For the frictional force producing between described lower plunger and described seal assembly, Iu5For liquid Post acts on the inertia force on the pump barrel of described oil well pump, FlpAct on viscous on described lower plunger for the fluid column in described cavity Stagnant power, Fi5For the 3rd pressure on described lower plunger for the pressure action in described oil well pump；
Wherein,
Fhu5+Fl5=Pout5×(Ap5-ArM5), Pout5For the pressure of the outlet of described oil well pump, Ap5Horizontal stroke for described upper plug The area in section, ArM5Area for described sucker rod lower end cross section；
ddpFor the diameter of described upper plug, de5For between described upper plug and described pump barrel wall Gap；
dspFor the diameter of described lower plunger, de6For described lower plunger and described seal assembly Gap；
Fl5Act on the first pressure on described upper plug, S for fluid column5For described oil pumping Bar drives the stroke that described plunger moves upwards, r5For oil pumping machine crank radius, l5For the length of connecting rod of described oil pumper, N5For Jig frequency, ε5Coefficient for fluid column acceleration change；
L is the length of described lower plunger, and K is that the inwall of described oil pick-up tube is straight Footpath and described lower plunger diameter ratio, μlFor the viscosity of described oil pumping tube fluid, S5For described sucker rod drive described plunger to The stroke of upper motion, N5For jig frequency；
Pc5For casing pressure, ρl5 For the density of liquid in described oil well pump, Asp5For the area of the cross section of described lower plunger, g is gravity constant, H5Deep for lower pump Degree, Hd5For fluid level depth of oil well, f05For supporting the area of passage of the valve port of described inlet valve, S5Drive institute for described sucker rod State the stroke that plunger moves upwards, N5For jig frequency, μ5Discharge coefficient for described inlet valve；
When described sucker rod drives described plunger to move downward, calculate that described sucker rod lower end is subject to according to the following equation closes Cheng Li：
Fr6=Fi6+Fp1+Fp2+Fbv5+Fhd5+For5-Ffk
Wherein, Fr6The composite force being subject to for described sucker rod lower end, Fi6For the pressure action in described oil well pump in described upper prop The 3rd pressure beyond the Great Wall, Fp1For the frictional force producing between described upper plug and described pump barrel wall, Fp2For described lower plunger and institute State the frictional force producing between seal assembly, Fbv5The resistance producing during for liquid by the valve port of described dump valve, Fhd5For well Mouth back pressure acts on the 4th pressure on described sucker rod rear surface, For5Act on the jacking on described sucker rod for fluid column Power, FfkIt is the 5th pressure that the inlet valve in described lower plunger is subject to；
Wherein,
Pc6For casing pressure, ρl5 For the density of liquid in described oil well pump, Asp5For the area of the cross section of described lower plunger, g is gravity constant, H6Deep for lower pump Degree, Hd6For fluid level depth of oil well, f06For supporting the area of passage of the valve port of described dump valve, S6Drive institute for described sucker rod State the stroke that plunger moves downward, N6For jig frequency, μ6Discharge coefficient for described dump valve；
ddpFor the diameter of described upper plug, de5For between described upper plug and described pump barrel wall Gap；
dspFor the diameter of described lower plunger, de6For described lower plunger and described seal assembly Gap；
Fhd5=Ph5ArM5, Ph5For wellhead back pressure, ArM5Area for described sucker rod lower end cross section；
ρl5For the density of liquid in described oil well pump, Asp5For described lower plunger Cross section area, f06For supporting the area of passage of the valve port of described dump valve, S6Drive described plunger for described sucker rod The stroke moving downward, N6For jig frequency, μ6Discharge coefficient for described dump valve；
For5=Pout5×ArM5, Pout5For the pressure of the outlet of described oil well pump, ArM5For described sucker rod lower end cross section Area；
Ffk=(Ph5+ρl5gH)×Asp5, Ph5For wellhead back pressure, ρl5For the density of liquid in described oil well pump, g is gravity constant, H For lower-continuous mapping, Asp5Area for the cross section of described lower plunger.
5. as claimed in claim 1 a kind of force analysis method of oil well pump it is characterised in that described plunger include in fall The upper plug of T-shaped connection and lower plunger, the diameter of the cross section with diameter greater than described upper plug of the cross section of described lower plunger, Described lower plunger is adjacent with the pump barrel wall of described oil well pump, is formed empty between the pump barrel wall of described upper plug and described oil well pump Chamber, described cavity upper end is filled with the seal assembly of preset thickness between the pump barrel wall of described upper plug and described oil well pump, In the case that dump valve is located in described upper plug and inlet valve is located on the interface of described upper plug and described lower plunger, In the direction driving described plunger motion according to described sucker rod, choose corresponding with the direction of motion from above-mentioned various power Before power, and the step of composite force being subject to based on the described sucker rod lower end of power calculating chosen, methods described also includes：
When calculating described sucker rod and driving described plunger to move downward, the 6th pressure that the dump valve in described upper plug is subject to Power.
6. as claimed in claim 5 a kind of force analysis method of oil well pump it is characterised in that described sucker rod drive described During plunger motion produce frictional force at least include between described lower plunger and the pump barrel wall of described oil well pump produce rub The frictional force producing between wiping power and described upper plug and described seal assembly；
Correspondingly, when described sucker rod drives described plunger to move upwards, calculate described sucker rod lower end according to the following equation The composite force being subject to：
Fr7=Fl7+Fhu7+Iu7+Fp7+Fp8+Fbv7-For7-Fi7
Wherein, Fr7The composite force being subject to for described sucker rod lower end, Fl7Act on the first pressure on described lower plunger for fluid column, Fhu7For the second pressure on described lower plunger for the pressure action of the outlet of described oil well pump, Fp7For described lower plunger and institute State the frictional force producing between pump barrel wall, Fp8For the frictional force producing between described upper plug and described seal assembly, Iu7For liquid Post acts on the inertia force on the pump barrel wall of described oil well pump, Fbv7The resistance producing during for liquid by the valve port of described dump valve Power, For7Act on the jacking force on described sucker rod, F for fluid columni7For the pressure action in described oil well pump in described upper plug On the 3rd pressure；
Wherein,
Fl7=ρl7gH7Abp7, ρl7For the density of liquid in described oil well pump, Abp7For the area of the cross section of described lower plunger, g is Gravity constant, H7For lower-continuous mapping；
Fhu7=Ph7Abp7, Ph7For wellhead back pressure, Abp7Area for the cross section of described lower plunger；
Fl7Act on the first pressure on described lower plunger, S for fluid column7For described oil pumping Bar drives the stroke that described plunger moves upwards, r7For oil pumping machine crank radius, l7For the length of connecting rod of described oil pumper, N7For Jig frequency, ε7Coefficient for fluid column acceleration change；
dbp7For the diameter of described lower plunger, de7For between described lower plunger and described pump barrel wall Gap；
dsp7For the diameter of described upper plug, de8For described upper plug and described seal assembly Gap；
ρl7For the density of liquid in described oil well pump, Asp7For described upper plug Cross section area, f07For supporting the area of passage of the valve port of described dump valve, S7Drive described plunger for described sucker rod The stroke moving upwards, N7For jig frequency, μ7Discharge coefficient for described dump valve；
For7=Pout7×ArM7, Pout7For the pressure of the outlet of described oil well pump, ArM7For described sucker rod lower end cross section Area；
Pc7For casing pressure, ρl7 For the density of liquid in described oil well pump, g is gravity constant, H7For lower-continuous mapping, Hd7For fluid level depth of oil well, Asp7For institute State the area of the cross section of upper plug, f07For supporting the area of passage of the valve port of described dump valve, S7Drive for described sucker rod The stroke that described plunger moves upwards, N7For jig frequency, μ7Discharge coefficient for described dump valve；
When described sucker rod drives described plunger to move downward, calculate that described sucker rod lower end is subject to according to the following equation closes Cheng Li：
Fr8=Fi8+Fp7+Fp8+Fout
Wherein, Fr8The composite force being subject to for described sucker rod lower end, Fi8For the pressure action in described oil well pump in described lower prop The 3rd pressure beyond the Great Wall, Fp7For the frictional force producing between described lower plunger and described pump barrel wall, Fp8For described upper plug and institute State the frictional force producing between seal assembly, FoutIt is the 6th pressure that the dump valve in described upper plug is subject to；
Wherein,
Pc8For casing pressure, ρl7 For the density of liquid in described oil well pump, g is gravity constant, H8For lower-continuous mapping, Hd8For fluid level depth of oil well, Asp7For institute State the area of the cross section of upper plug, f08For supporting the area of passage of the valve port of described inlet valve, S8Drive for described sucker rod The stroke that described plunger moves downward, N8For jig frequency, μ8Discharge coefficient for described inlet valve；
dbp7For the diameter of described lower plunger, de7For between described lower plunger and described pump barrel wall Gap；
dsp7For the diameter of described upper plug, de8For described upper plug and described seal assembly Gap；
Fout=Pout8×(Asp7-ArM7), Pout8For the pressure of the outlet of described oil well pump, Asp7Transversal for described upper plug The area in face, ArM7Area for described sucker rod lower end cross section.
7. as claimed in claim 1 a kind of force analysis method of oil well pump it is characterised in that described plunger include in fall The upper plug of T-shaped connection and lower plunger, the diameter of the cross section with diameter greater than described upper plug of the cross section of described lower plunger, Described lower plunger is adjacent with the pump barrel wall of described oil well pump, is formed empty between the pump barrel wall of described upper plug and described oil well pump Chamber, described cavity upper end is filled with the seal assembly of preset thickness between the pump barrel wall of described upper plug and described oil well pump, It is mounted with first order dump valve in described upper plug, be mounted with second level dump valve in described lower plunger and inlet valve is located at institute In the case of stating on the pump barrel diapire of oil well pump, in the direction driving described plunger motion according to described sucker rod, from above-mentioned each Choose the power corresponding with the direction of motion in the power of kind, and the composite force that described sucker rod lower end is subject to is calculated based on the power chosen Before step, methods described also includes：
During calculating the described sucker rod described plunger motion of drive, the fluid column in described cavity acts on described lower plunger 7th pressure.
8. as claimed in claim 7 a kind of force analysis method of oil well pump it is characterised in that described sucker rod drive described During plunger motion produce frictional force at least include between described lower plunger and the pump barrel wall of described oil well pump produce rub The frictional force producing between wiping power and described upper plug and described seal assembly；
Correspondingly, when described sucker rod drives described plunger to move upwards, calculate described sucker rod lower end according to the following equation The composite force being subject to：
Fr9=Fl9+Fhu9+Iu9+Fp9+Fps+Fas-Fi9
Wherein, Fr9The composite force being subject to for described sucker rod lower end, Fl9Act on the first pressure on described upper plug for fluid column, Fhu9For the second pressure on described upper plug for the pressure action of the outlet of described oil well pump, Fp9For described lower plunger and institute State the frictional force producing between pump barrel wall, FpsFor the frictional force producing between described upper plug and described seal assembly, FasFor institute State the 7th pressure that the fluid column in cavity acts on described lower plunger, Iu9Act on the pump barrel wall of described oil well pump for fluid column Inertia force, Fi9For the 3rd pressure on described lower plunger for the pressure action in described oil well pump；
Fhu9+Fl9=Pout9×(Asp9-ArM9), Pout9For the pressure of the outlet of described oil well pump, Asp9Horizontal stroke for described upper plug The area in section, ArM9Area for described sucker rod lower end cross section；
dbp9For the diameter of described lower plunger, de9For between described lower plunger and described pump barrel wall Gap；
dsp9For the diameter of described upper plug, de10For described upper plug and described seal assembly Gap；
Fl9Act on the first pressure on described upper plug, S for fluid column9For described oil pumping Bar drives the stroke that described plunger moves upwards, r9For oil pumping machine crank radius, l9For the length of connecting rod of described oil pumper, N9For Jig frequency, ε9Coefficient for fluid column acceleration change；
Fas=[Pc9+ρl9g(H9-Hd9)](Abp9-Asp9), Pc9For casing pressure, ρl9For the density of liquid in described oil well pump, Abp9 For the area of the cross section of described lower plunger, g is gravity constant, H9For lower-continuous mapping, Hd9For fluid level depth of oil well, Asp9For The area of the cross section of described upper plug；
Pc9For casing pressure, ρl9 For the density of liquid in described oil well pump, Abp9For the area of the cross section of described lower plunger, g is gravity constant, H9Deep for lower pump Degree, Hd9For fluid level depth of oil well, f09For supporting the area of passage of the valve port of described inlet valve, S9Drive institute for described sucker rod State the stroke that plunger moves upwards, N9For jig frequency, μ9Discharge coefficient for described inlet valve；
When described sucker rod drives described plunger to move downward, calculate that described sucker rod lower end is subject to according to the following equation closes Cheng Li：
Fr10=Fp9+Fhd10+Fps+Fbv10+For10-Fas2
Wherein, Fr10The composite force being subject to for described sucker rod lower end, Fp9Produce between described lower plunger and described pump barrel wall rubs Wiping power, FpsFor the frictional force producing between described upper plug and described seal assembly, Fbv10Arranged by the described first order for liquid The resistance sum producing during the valve port going out the valve port of valve and described second level dump valve, Fhd10Act on described for wellhead back pressure The 4th pressure on sucker rod rear surface, For10Act on the jacking force on described sucker rod, F for fluid columnas2For described cavity Interior fluid column acts on the 7th pressure on described lower plunger；
Wherein,
dbp9For the diameter of described lower plunger, de9For between described lower plunger and described pump barrel wall Gap；
dsp9For the diameter of described upper plug, de10For described upper plug and described seal assembly Gap；
Fhd10=Ph10ArM9, Ph10For wellhead back pressure, ArM9Area for described sucker rod lower end cross section；
ρl9For described oil pumping The density of liquid, A in pumpbp9For the area of the cross section of described lower plunger, g is gravity constant, f010For supporting the described second level The area of passage of the valve port of dump valve, S10The stroke moving upwards for the described sucker rod described plunger of drive, N10For jig frequency, μ10 For the discharge coefficient of described second level dump valve, Asp9For the area of the cross section of described upper plug, μ11Discharge for the described first order The discharge coefficient of valve, f011For supporting the area of passage of the valve port of described first order dump valve；
For10=Pout10×ArM9, Pout10For the pressure of the outlet of described oil well pump, ArM9For described sucker rod lower end cross section Area；
Fas2=[Pc10+ρl9g(H10-Hd10)](Abp9-Asp9), Pc10For casing pressure, ρl9For in described oil well pump liquid close Degree, Abp9For the area of the cross section of described lower plunger, g is gravity constant, H10For lower-continuous mapping, Hd10Deep for well fluid level Degree, Asp9Area for the cross section of described upper plug.
9. the force analysis device of a kind of oil well pump, described oil well pump includes sucker rod and the post being connected with described sucker rod Plug, described sucker rod can drive described plunger to be moved up and down it is characterised in that described device includes：
First computing unit, when driving described plunger to move upwards for calculating described sucker rod, fluid column acts on described plunger On first pressure, the second pressure on described plunger for the pressure action of the outlet of described oil well pump and fluid column act on Inertia force on the pump barrel of described oil well pump；
Second computing unit, for calculating the frictional force producing during described sucker rod drives described plunger motion；
3rd computing unit, drives the valve port by dump valve for the liquid during described plunger motion for calculating described sucker rod Or the resistance producing during the valve port of inlet valve and fluid column act on the jacking force on described sucker rod；
4th computing unit, the pressure during calculating the described sucker rod described plunger motion of drive, in described oil well pump Act on the 3rd pressure on described plunger and wellhead back pressure acts on the 4th pressure on described sucker rod rear surface；
Composite force select unit, for driving the direction of described plunger motion according to described sucker rod, selects from above-mentioned various power Take the power corresponding with the direction of motion；
Composite force computing unit, for calculating, based on the power chosen, the composite force that described sucker rod lower end is subject to；
Wherein, it is in close proximity to the pump barrel wall of described oil well pump in described plunger, the lower surface of described plunger offers for the row of support Go out the valve port of valve and in the case that inlet valve is located on the pump barrel diapire of described oil well pump；
When described sucker rod drives described plunger to move upwards, calculate that described sucker rod lower end is subject to according to the following equation closes Cheng Li：
Fr1=Fl1+Fhu1+Fp+Iu1-Fi1
Wherein, Fr1The composite force being subject to for described sucker rod lower end, Fl1Act on the first pressure on described plunger for fluid column, Fhu1For the second pressure on described plunger for the pressure action of the outlet of described oil well pump, FpFor described plunger and described pump The frictional force producing between barrel, Iu1Act on the inertia force on the pump barrel of described oil well pump, F for fluid columni1For described oil well pump 3rd pressure on described plunger for the interior pressure action；
Wherein,
Fhu1+Fl1=Pout1×(Ap1-ArM1), Pout1For the pressure of the outlet of described oil well pump, Ap1Transversal for described plunger The area in face, ArM1Area for described sucker rod lower end cross section；
dpFor the diameter of described plunger, deGap for described plunger and described pump barrel wall；
Fl1Act on the first pressure on described plunger, S for fluid column1For described sucker rod Drive the stroke that described plunger moves upwards, r1For oil pumping machine crank radius, l1For the length of connecting rod of described oil pumper, N1For punching Secondary, ε1Coefficient for fluid column acceleration change；
Pc1For casing pressure, ρl1For The density of liquid, A in described oil well pumpp1For the area of the cross section of described plunger, g is gravity constant, H1For lower-continuous mapping, Hd1 For fluid level depth of oil well, f01For supporting the area of passage of the valve port of described inlet valve, S1Drive described post for described sucker rod Fill in the stroke moving upwards, N1For jig frequency, μ1Discharge coefficient for described inlet valve；
When described sucker rod drives described plunger to move downward, calculate that described sucker rod lower end is subject to according to the following equation closes Cheng Li：
Fr2=Fp+Fbv1+Fhd1+For1
Wherein, Fr2The composite force being subject to for described sucker rod lower end, FpThe friction producing between described plunger and described pump barrel wall Power, Fbv1The resistance producing during for liquid by the valve port of described dump valve, Fhd1Act under described sucker rod for wellhead back pressure The 4th pressure on end surfaces, For1Act on the jacking force on described sucker rod for fluid column；
Wherein,
dpFor the diameter of described plunger, deGap for described plunger and described pump barrel wall；
Fhd1=Ph1ArM1, Ph1For wellhead back pressure, ArM1Area for described sucker rod lower end cross section；
ρl1For the density of liquid in described oil well pump, f02For supporting described discharge The area of passage of the valve port of valve, Ap1For the area of the cross section of described plunger, S2Drive described plunger downward for described sucker rod The stroke of motion, N2For jig frequency, μ2Discharge coefficient for described dump valve；
For1=Pout1×ArM1, Pout1For the pressure of the outlet of described oil well pump, ArM1For described sucker rod lower end cross section Area.
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