CN103807162A - Surface textured fracturing pump plunger and performance test method for dynamic seal system of plunger - Google Patents
Surface textured fracturing pump plunger and performance test method for dynamic seal system of plunger Download PDFInfo
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- CN103807162A CN103807162A CN201310423514.3A CN201310423514A CN103807162A CN 103807162 A CN103807162 A CN 103807162A CN 201310423514 A CN201310423514 A CN 201310423514A CN 103807162 A CN103807162 A CN 103807162A
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Abstract
The invention discloses a surface textured fracturing pump plunger and a performance test method for a dynamic seal system of the plunger. A forced lubricant is accommodated in the left side of a seal assembly; an intracavity fracturing fluid is accommodated in the right side of the plunger; a cylindrical or conical texture is arranged on the cylindrical surface of the plunger; and the surface texture adopts a plurality of cylindrical or conical pits which are uniformly distributed or staggered in the peripheral direction of the cylindrical surface of the plunger. During testing, the method comprises steps as follows: assembling test parts, debugging test devices, recording initial data, starting a motor, collecting a reading number of each sensor at an experimental stage, observing abrasion loss and surface grinding cracks of plunger test pieces and seal assembly pieces, and processing and analyzing recorded experimental data. According to the invention, a surface texture technology is applied to the fracturing pump plunger, the surface texture technology applied to the dynamic sealing field of contact forms of rigid materials and flexible materials is broken through, the effects of remarkable reduction of friction coefficients of the dynamic seal system and temperature rising reduction are achieved, and the service life of the dynamic seal system is prolonged.
Description
Technical field
The invention belongs to oil exploration equipment field, relate in particular to a kind of fracturing pump plunger and motive sealing system performance testing method thereof of surface-texturing.
Background technique
Fracturing pump is that pressure break, acidizing treatment are carried out in oil field, improves the visual plant of Oil/gas Well output.Plunger motive sealing system is its critical component, also be main easily worn part, its sealability and tribological property quality directly affect the normal enforcement of acidizing treatment, under higher jig frequency, plunger surface and seal ring surface can produce more frictional heat, acceleration rubber parts is aging, makes it too early following the string, and reduces the radially enclasping force to plunger.Fracturing pump is along with pressure break environment is severe, it is the increase of well depth, and the expansion of fracture acidizing radius, in the urgent need to strengthening fracture acidizing technique, require to inject high pressure, high sand ratio, high acidity fracturing fluid, this operating conditions that is undoubtedly plunger motive sealing system becomes harsher, heavy corrosion, abrasive wear and the fatigue failure of plunger motive sealing system are caused, the wear-resisting property of plunger and the leakage prevention capability of sealing system have just declined like this, finally cause reduce the working life of fracturing pump.
The effect of fracturing pump plunger seal and tribological property depend on anti-leak and the quality lubricated, Wear vesistance of plunger motive sealing system, and this will directly determine the working life of fracturing pump.Therefore in order further to improve acidifying, pressure break efficiency and the working life of fracturing pump, leakage and the wearing and tearing of fracturing pump plunger motive sealing system are current problem demanding prompt solutions.Must adopt new technology and technique to improve tribological property and the sealability of fracturing pump plunger motive sealing system, and seek a kind of scheme of motive sealing system performance parameter experiment that can Real-Time Monitoring fracturing pump internal data change and obtain.
Summary of the invention
The object of the present invention is to provide a kind of fracturing pump plunger motive sealing system of surface-texturing, be intended to improve the problem of the very fast and serious wear of the seal failure of traditional fracturing pump plunger motive sealing friction pair.Another object of the present invention is to provide a kind of performance test methods of plunger motive sealing system, be intended to solve the Design of Problems that fracturing pump sealability and frictional behaviour in movement process be difficult to real-time monitored and go out a kind of scheme that can better complete fracturing pump motive sealing internal system performance parameter examinations.Thereby there is scheme and judge that can certain Surface Texture parameter effectively improve the dynamic pressure sealing of plunger motive sealing system fluid and tribological property.
The present invention realizes like this, as shown in Figure 1, fracturing pump plunger motive sealing system mainly comprises plunger and seal combination, described seal combination mainly comprises seal ring and folder cloth seal ring, the left side of described seal combination is pressure lubrication agent, described plunger right side is fracturing fluid in chamber, is provided with cylindrical or conical Surface Texture on the cylndrical surface of described plunger, and described Surface Texture is for to be uniformly distributed or to be interspersed along plunger cylinder face circumferencial direction.
Further, described plunger adopts No. 20 Steel materials to make, plunger surface spraying T15E-10 material, and coating thickness is 0.4mm, and the seal ring of described seal combination is nitrile rubber material, and the material of folder cloth seal ring is folder cloth nitrile rubber.
Further, the Surface Texture of described plunger cylinder face is during along the cylindrical pit being uniformly distributed on its circumferencial direction or be interspersed, and the diameter d of described cylindrical pit is 50 μ m～400 μ m, the Area Ratio S of described cylindrical pit
pbe 0.5%～5%, and the degree of depth h of described cylindrical pit is 5 μ m～30 μ m; When the Surface Texture of described plunger cylinder face be along on its circumferencial direction evenly or when the conic shaped being interspersed, the Outside diameter d of described conic shaped is 60 μ m～700 μ m, the Area Ratio S of described conic shaped
pbe 0.5%～8%, and the degree of depth h of described conic shaped is 10 μ m～50 μ m.
Further, circumferential being uniformly distributed of cylindrical Texture plunger cylinder face of described plunger surface, pit diameter d is 0.2mm, Area Ratio is 2%, when the degree of depth is 10 μ m, the lubrication drag reduction best performance of fracturing pump plunger motive sealing system, compares without the kinematic friction coefficient of texture plunger and reduces more than 50%, and fracturing fluid temperature rise also reduces more than 30%.
Further, the Surface Texture of described plunger completes by laser-engraving technique, step is for first drawing out Surface Texture pattern by mapping software, carry routing software generating code and carve thereby then import Engraving machineslaser, the plunger after finally complete to laser engraving carries out polishing treatment and removes burr.
Described plunger motive sealing system performance testing method, comprises assembling test parts, debugging test device, records primary data, starting electrical machinery and gathers the reading of this each sensor of experimental stage, wear extent to plunger test specimen and seal combination test specimen and the observation of surperficial polishing scratch, the laboratory data of record is carried out to Treatment Analysis.Concrete steps are as follows:
Each testing apparatus parts of step 1, assembling test fracturing pump plunger motive sealing system sealing performance and tribological property;
Further, the experimental setup of described plunger motive sealing system performance testing comprises motor, the retarder being connected with motor and coupling combination, be connected in the bent axle of coupling, bent axle is connected in connecting rod, connecting rod is connected in crosshead by roll pin, crosshead is connected in plunger, and plunger is installed in the active chamber of valve body, plunger motive sealing system with the black box composition fracturing pump in valve body, between crosshead and plunger, be connected with spoke-type pull pressure sensor and acceleration transducer, axial force transducer is connected by screw thread with crosshead, then be connected with plunger by bolt, and acceleration transducer is threaded connection in the tapped hole of plunger inside, on described plunger motive sealing system fracturing pump, be connected with forced lubrication device and liquid-pressure pick-up, described plunger motive sealing system position is connected with temperature transducer, the suction side of described fracturing pump is connected with pressure break liquid pool with suction manifold by charge pump, the exhaust end of described fracturing pump by exhaust manifold and pressure regulator valve after, after cooling pond is cooling, be connected with pressure break pond again, thereby forming fracturing pump sucks, discharge process is of the fracturing fluid to be recycled, the locking nut position of described fracturing pump is connected with the liquid-pressure pick-up that surveying work chamber fracturing fluid pressure changes, described liquid-pressure pick-up and, temperature transducer, axial force transducer, acceleration transducer is all connected with high-frequency data capture card, described data collecting card is connected with data presentation device.
Further, axial force transducer is spoke-type pull pressure sensor described in the testing apparatus of described plunger motive sealing system performance testing, and temperature transducer is thermojunction type sensor.
Further, the spoke-type pull pressure sensor of described measurement plunger axial force adopts screw-thread fit to be connected with crosshead, and then fixes by bolt and plunger test specimen.
Further, described plunger motive sealing system performance testing method, fracturing pump plunger seal combination in the to-and-fro motion sucking, discharge is hydrodynamic seal to the sealing means of plunger, in pressure P 1 (the t) >=active chamber of plunger motive sealing system left side lubricant medium, when of the fracturing fluid pressure P 2 (t), plunger motive sealing system can not be leaked.
Further, in described plunger motive sealing system performance testing method, suppose: 1, ignore the variation of plunger quality in test;
2, in plunger to-and-fro motion process, the lubrication and seal medium between plunger and sealed packing is communicated with fracturing fluid all the time.
Coefficient of kinetic friction f is by formula:
Wherein: A---the cross-section area of plunger;
The coefficient of kinetic friction between F (τ)---plunger and packing combination,
D-plunger diameter;
The axial length of b-surface of contact;
Pressure medium in P2 (t)-valve body active chamber;
The quality of m---plunger;
The to-and-fro motion acceleration of a (t)---plunger;
Good effect of the present invention is;
1, first Surface Texture technology is applied on fracturing pump plunger, realizes Surface Texture technology and be applied to the breakthrough in the motive sealing field of the way of contact of rigid and flexible material.
2, choose rational Surface Texture form and arrive fracturing pump plunger surface by laser beam machining, and compared with texture plunger, there is significant reduction friction factor, reduce the effect of temperature rise, thereby improve the working life of motive sealing system.
3, a kind of scheme can Real-Time Monitoring fracturing pump internal data changing is designed in invention, and by calculating the friction factor that can obtain between real-time plunger and seal combination.
Accompanying drawing explanation
Fig. 1 is each sensor connection diagram in fracturing pump motive sealing system performance testing;
Fig. 2 is fracturing pump motive sealing system place partial enlarged drawing;
Fig. 3 is that optimum barrel surface texture plunger launches Local map;
Fig. 4 be optimum barrel surface texture plunger with without texture plunger friction factor comparison diagram.
Fig. 5 is plunger pump motive sealing system performance test flow chart.
In figure: 1-motor, 2-retarder, 3-crank, 4-connecting rod, 5-horizontal guide rail, the degree of depth h that 6-states cylindrical pit is 5 μ m～30 μ m.
Further, the cylindrical texture 23 on described plunger 17 surfaces is along plunger 17 excircles to being uniformly distributed, pit diameter d is 0.2mm, Area Ratio is 2%, when the degree of depth is 10 μ m, the lubrication drag reduction best performance of fracturing pump plunger motive sealing system, as shown in Figure 4, compare without the kinematic friction coefficient of texture plunger and reduce more than 50%, fracturing fluid temperature rise also reduces more than 30%.
Further, described cylindrical plunger Surface Texture 23 completes by laser-engraving technique, step is for first drawing out Surface Texture pattern by mapping software, carry routing software generating code and carve thereby then import Engraving machineslaser, the plunger after finally complete to laser engraving carries out polishing treatment and removes burr.
As shown in Figure 5, described plunger motive sealing system performance testing method, comprising:
S101 assembling test parts, S102 debugging test device, S103 record primary data, S104 starting electrical machinery and gather wear extent to plunger test specimen and seal combination test specimen of the reading of this each sensor of experimental stage, S105 and the observation of surperficial polishing scratch, S106 are carried out Treatment Analysis to the laboratory data of record.
Concrete steps are as follows:
Each testing apparatus parts of step 1, assembling test fracturing pump plunger motive sealing system sealing performance and tribological property;
Embodiment
In order to make object of the present invention, technological scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
The present invention realizes like this, as depicted in figs. 1 and 2, barrel surface texture plunger motive sealing system mainly comprises plunger 17 and seal combination 8, described seal combination 8 mainly comprises seal ring 26 and folder cloth seal ring 27, the left side of described seal combination 8 is that pressure lubrication agent 24, described plunger 17 right sides are fracturing fluid 25 in chamber, on the periphery of described plunger 17, be provided with cylindrical texture 23, the some cylindrical pit of described cylindrical texture 23 for being uniformly distributed or being interspersed along plunger 17 outer surface circumferencial directions.
Further, described plunger 17 adopts No. 20 Steel materials to make, plunger 17 surface spraying T15E-10 materials, and coating thickness is 0.4mm, and the seal ring 26 of described seal combination 8 is nitrile rubber material, and the material of folder cloth seal ring 27 is folder cloth nitrile rubber.
Further, the cylindrical texture 23 of described plunger 17 outer surfaces, be along on its circumferencial direction, be uniformly distributed or be interspersed cylindrical pit time, the diameter d of described cylindrical pit is 50 μ m～400 μ m, the Area Ratio S of described cylindrical pit
pbe 0.5%～5%, and the quality m2 of institute's assembly parts, the surface topography before plunger test specimen and combined seal ring experiment;
Further, as shown in Figure 1, the retarder that the experimental setup of described plunger motive sealing system performance testing comprises motor 1, be connected with motor 2 and coupling combination 2, the bent axle 3, the bent axle 3 that are connected in coupling be connected in connecting rod 4, connecting rod 4 by roll pin be connected in crosshead 6, crosshead 6 is connected in plunger 17, and plunger 17 is installed in the active chamber of valve body 9
Form the plunger motive sealing system of fracturing pump with the black box 8 in valve body 9, between crosshead 6 and plunger 17, be connected with spoke-type pull pressure sensor 21 and acceleration transducer 20, axial force transducer 21 is connected by screw thread with crosshead 6, then be connected with plunger 17 by bolt, and acceleration transducer 20 is threaded connection in the tapped hole of plunger 17 inside, on described plunger motive sealing system fracturing pump, be connected with forced lubrication device and liquid-pressure pick-up 7, described plunger motive sealing system position is connected with temperature transducer 18, the suction side 16 of described fracturing pump is connected with pressure break pond 14 with suction manifold by charge pump 15, the exhaust end 10 of described fracturing pump by exhaust manifold and pressure regulator valve 12 after, after cooling pond 13 is cooling, be connected with pressure break pond 14 again, thereby forming fracturing pump sucks, discharge process is of the fracturing fluid to be recycled, the locking nut position of described fracturing pump is connected with the liquid-pressure pick-up 11 that surveying work chamber fracturing fluid pressure changes, described liquid-pressure pick-up 7 and 11, temperature transducer 18, axial force transducer 21, acceleration transducer 20 is all connected with high-frequency data capture card 19, described data collecting card 19 is connected with data presentation device 22.
Further, axial force transducer 21 is spoke-type pull pressure sensor described in the testing apparatus of described plunger motive sealing system performance testing, and temperature transducer 18 is thermojunction type sensor.
Further, the spoke-type pull pressure sensor 21 of described measurement plunger axial force adopts screw-thread fit to be connected with crosshead 6, and then fixing by bolt and plunger 17.
Further, described plunger motive sealing system performance testing method, fracturing pump plunger seal combination in the to-and-fro motion sucking, discharge is hydrodynamic seal to the sealing means of plunger, in pressure P 1 (the t) >=active chamber of plunger motive sealing system left side lubricant medium, when of the fracturing fluid pressure P 2 (t), plunger motive sealing system can not be leaked.
Further, in described plunger motive sealing system performance testing method, suppose: 1, ignore the variation of plunger quality in test;
2, in plunger to-and-fro motion process, the lubrication and seal medium between plunger and sealed packing is communicated with fracturing fluid all the time.
Coefficient of kinetic friction f is by formula:
Wherein: A---the cross-section area of plunger;
The coefficient of kinetic friction between F (t)---plunger and packing combination,
D---plunger diameter;
The axial length of b---surface of contact;
P2 (t)---the pressure medium in valve body active chamber;
The quality of m-plunger;
The to-and-fro motion acceleration of a (t)---plunger;
working principle and breakthrough
When the Surface Texture 23 of two sides rigidity friction pair can be stored abrasive dust and the abrasive particle that fretting wear produces, thereby avoid abrasive particle or abrasive dust under plunger to-and-fro motion drives, to produce secondary wearing and tearing; Simultaneously because the pit of Surface Texture and mobile lubricant medium have formed local hydrodynamic, thus raising bearing capacity; In this while, under the inadequate condition of oiling agent, the lubricant medium being stored in Surface Texture 23 forms squeeze film, the lubricant medium that supplemental lubrication is required because the mobile lubricating grease of friction pair is extruded.
So the firm friction pair in two sides can be subject to compared with the mutual extruding of large load indeformable needn't consider because of extruding cause embedding after a side material excessive deformation in the opposing party's Surface Texture however in fracturing pump motive sealing system friction pair there is the flexible body of rubber and so on, just have to consider the factor of this respect.Experiment draws in the larger situation in the cylindrical pit aperture of plunger 17, after the easy extrusion-deformation of rubber, embed deeply in the Surface Texture of plunger, in friction pair moving process, strengthen on the contrary surface friction drag, increased wear extent, caused the motive sealing lifetime of system in fracturing pump greatly to decline.If adopt very little micro-hole can not make full use of again the anti-attrition lubrication property of above-mentioned told Surface Texture.Therefore, must be according to actual pressure break plunger pump structure operating mode, the Surface Texture pit shape size of reasonable and arranged distribution are applied to plunger 17 surfaces, to reduce the wearing and tearing of plunger and rubber, increase the working life of motive sealing system.
After a large amount of motive sealing system performance tests, draw: plunger 17 cylndrical surface Surface Textures are uniformly distributed or are interspersed as cylindrical: the diameter d of pit is 50 μ m-200 μ m, Area Ratio Sp is 0.5%～5%, the degree of depth h of pit is 5 μ m～30 μ m and taper shapes: Outside diameter d is 60 μ m～700 μ m, Area Ratio S
pbe 0.5%～8%, degree of depth h is 10 μ m～50 μ m.The plunger 17 with above-mentioned Surface Texture has good sealability and the lubricated Wear vesistance of tribology with the motive sealing system of caulking gum composition.
And when plunger 17 Surface Textures are that cylindrical pit is circumferentially uniformly distributed along plunger cylinder face, pit diameter d is 0.2mm, Area Ratio is 2%, the lubrication drag reduction best performance of fracturing pump plunger motive sealing system when the degree of depth is 10 μ m, its plunger cylinder face Surface Texture 23 graphics processing local expansions as shown in Figure 3.This kind of Surface Texture plunger is with compared with texture plunger, as shown in Figure 4, kinematic friction coefficient reduces more than 50% (in one hour, to obtain data), and fracturing fluid temperature rise reduces more than 30%, thereby make the longer service life of plunger seal, reduce the overhaul of the equipments time.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on technological scheme of the present invention basis, those skilled in the art do not need to pay various modifications that performing creative labour can make or distortion still within the protection domain of table invention.
Claims (10)
1. a surface-texturing plunger motive sealing system, it is characterized in that, described surface-texturing plunger motive sealing system comprises plunger and seal combination, described seal combination mainly comprises seal ring and folder cloth seal ring, the left side of described seal combination is pressure lubrication agent, described plunger right side is fracturing fluid in chamber, sculpture surface texture on the cylndrical surface of described plunger, described Surface Texture is the some cylindrical or conic shaped that is uniformly distributed or is interspersed along plunger cylinder face circumferencial direction.
2. surface-texturing plunger motive sealing system as claimed in claim 1, it is characterized in that, described plunger adopts No. 20 Steel materials to make, plunger surface spraying T15E-10 material, and coating thickness is 0.4mm, the seal ring of described seal combination is nitrile rubber material, and the material of folder cloth seal ring is folder cloth nitrile rubber.
3. surperficial shape texturing plunger motive sealing system as claimed in claim 1, it is characterized in that, when the Surface Texture of described plunger cylinder face be along on its circumferencial direction, be uniformly distributed or be interspersed cylindrical pit time, the diameter d of described cylindrical pit is 50 μ m～400 μ m, the Area Ratio S of described cylindrical pit
pbe 0.5%～5%, and the degree of depth h of described cylindrical pit is 5 μ m～30 μ m; When the Surface Texture of described plunger cylinder face be along on its circumferencial direction evenly or when the conic shaped being interspersed, the Outside diameter d of described conic shaped is 60 μ m～700 μ m, the Area Ratio S of described conic shaped
pbe 0.5%～8%, and the degree of depth h of described conic shaped is 10 μ m～50 μ m.
4. cylindrical texture plunger motive sealing system as claimed in claim 3, it is characterized in that, the cylindrical Texture plunger excircle of described plunger surface is to being uniformly distributed, pit diameter d is 0.2mm, Area Ratio is 2%, when the degree of depth is 10 μ m, the lubrication drag reduction best performance of fracturing pump plunger motive sealing system.
5. cylindrical or conical texture plunger motive sealing system as claimed in claim 3, it is characterized in that, described cylindrical or conical plunger Surface Texture completes by laser-engraving technique, step is for first drawing out Surface Texture pattern by mapping software, carry routing software generating code and carve thereby then import Engraving machineslaser, the plunger after finally complete to laser engraving carries out polishing treatment and removes burr.
6. the performance test methods of a fracturing pump plunger motive sealing system, it is characterized in that, described plunger motive sealing system performance testing method comprises: assembling test parts, debugging test device, record primary data, starting electrical machinery and gather the reading of this each sensor of experimental stage, wear extent to plunger test specimen and seal combination test specimen and the observation of surperficial polishing scratch, the laboratory data of record is carried out to Treatment Analysis, concrete steps are as follows:
Each testing apparatus parts of step 1, assembling test fracturing pump plunger motive sealing system sealing performance and tribological property;
Step 2, debugging test device, move this experimental setup, it is all voltage signal or current signal that the output signal of adjusting each sensor makes it, and the frequency acquisition of adjusting data collecting card guarantees that data-signal that each sensor can collect signal and collection meets the requirement of subsequent experimental data processing;
Step 3, record primary data, comprise quality m1, the quality m2 of seal assembly of plunger test specimen before experiment, the surface topography before plunger test specimen and combined seal ring experiment;
Step 4, starting electrical machinery move this experimental setup, gather the reading of this each sensor of experimental stage simultaneously, here the lubricant pressure that defines the plunger motive sealing system left side of liquid-pressure pick-up collection is P1 (t), fracturing fluid pressure in the valve body active chamber of liquid-pressure pick-up collection is P2 (t), the temperature rise of the friction pair of the plunger motive sealing system of temperature transducer collection is T (t), the plunger to-and-fro motion acceleration of acceleration transducer collection is a (t), and the plunger reciprocating power of spoke-type pull pressure sensor collection is F (t);
Step 5, decomposition pressure break pump plunger motive sealing system, the wear extent to plunger test specimen and seal combination test specimen and the observation of surperficial polishing scratch, the quality of record test back-plunger is that the quality of m3, seal combination test specimen is m4;
Step 6, to record laboratory data carry out Treatment Analysis.
7. the performance test methods of fracturing pump plunger motive sealing system as claimed in claim 6, it is characterized in that, the experimental setup of described plunger motive sealing system performance testing comprises motor, the retarder being connected with motor and coupling combination, be connected in the bent axle of coupling, bent axle is connected in connecting rod, connecting rod is connected in crosshead by roll pin, crosshead is connected in plunger, and plunger is installed in the active chamber of valve body, plunger motive sealing system with the black box composition fracturing pump in valve body, between crosshead and plunger, be connected with spoke-type pull pressure sensor and acceleration transducer, axial force transducer is connected by screw thread with crosshead, then be connected with plunger by bolt, and acceleration transducer is threaded connection in the tapped hole of plunger inside, on described plunger motive sealing system fracturing pump, be connected with forced lubrication device and liquid-pressure pick-up, described plunger motive sealing system position is connected with temperature transducer, the suction side of described fracturing pump is connected with pressure break liquid pool with suction manifold by charge pump, the exhaust end of described fracturing pump by exhaust manifold and pressure regulator valve after, after cooling pond is cooling, be connected with pressure break pond again, thereby forming fracturing pump sucks, discharge process is of the fracturing fluid to be recycled, the locking nut position of described fracturing pump is connected with the liquid-pressure pick-up that surveying work chamber fracturing fluid pressure changes, described liquid-pressure pick-up, temperature transducer, axial force transducer is all connected with high-frequency data capture card with acceleration transducer, described data collecting card is connected with data presentation device.
8. the performance test methods of fracturing pump plunger motive sealing system as claimed in claim 6, it is characterized in that, the testing apparatus of described plunger motive sealing system performance testing, described axial force transducer is spoke-type pull pressure sensor, temperature transducer is thermojunction type sensor.
9. the performance test methods of fracturing pump plunger motive sealing system as claimed in claim 6, it is characterized in that, the spoke-type pull pressure sensor of described measurement plunger axial force adopts screw-thread fit to be connected with crosshead, and then fixes by bolt and plunger test specimen;
Fracturing pump plunger seal combination in the to-and-fro motion sucking, discharge is hydrodynamic seal to the sealing means of plunger, in pressure P 1 (the t) >=active chamber of plunger motive sealing system left side lubricant medium, when of the fracturing fluid pressure P 2 (t), plunger motive sealing system can not be leaked.
10. the performance test methods of fracturing pump plunger motive sealing system as claimed in claim 6, is characterized in that, in described plunger motive sealing system performance testing method, supposes:
A, ignore the variation of plunger quality in test;
Lubrication and seal medium in b, plunger to-and-fro motion process between plunger and sealed packing is communicated with fracturing fluid all the time;
Coefficient of kinetic friction f is by formula:
Wherein: A---the cross-section area of plunger;
The coefficient of kinetic friction between F (t)---plunger and packing combination,
D---plunger diameter;
The axial length of b---surface of contact;
P2 (t)---the pressure medium in valve body active chamber;
The quality of m---plunger;
The to-and-fro motion acceleration of a (t)---plunger;
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