CN106499613A

CN106499613A - Oil well pump

Info

Publication number: CN106499613A
Application number: CN201611078832.0A
Authority: CN
Inventors: 王显荣; 梁兴; 王文钢; 罗鹏飞; 孙翠容; 吴建华; 赵吉成; 张红朋; 徐丹; 任鹏程; 高春阳; 罗军; 姜雷; 张曦宇; 孔令坤; 马振; 侯兴卫; 李洪斌; 王斐; 王睿
Original assignee: China Petroleum and Natural Gas Co Ltd
Current assignee: China Petroleum and Natural Gas Co Ltd
Priority date: 2016-11-30
Filing date: 2016-11-30
Publication date: 2017-03-15
Anticipated expiration: 2036-11-30
Also published as: CN106499613B

Abstract

The invention discloses a kind of oil well pump, which is related to technical field of petroleum extraction, and the oil well pump includes：Pump barrel unit, it include the pump barrel that the outer tube being made of metal and the multistage being arranged in outer tube are made up of pottery, are provided with the first packing ring between the pump barrel of adjacent segment, and the diameter of outer tube is less than the diameter of pump barrel；The plunger unit being arranged in pump barrel, which includes upward-traveling valves unit, the inner tube being made of metal being connected with upward-traveling valves unit by plunger top connection, the multistage plunger being made up of pottery being arranged on outside inner tube, the lower travelling valve unit being connected to by plunger lower contact below inner tube and plunger, second packing ring is provided between the plunger of adjacent segment, the first butterfly spring is provided between plunger top connection and plunger, first butterfly spring lower end is used for the upper end for propping up plunger, the sleeve pipe being connected with outer tube, it is connected with sleeve pipe for propping up the connecting tube of plunger unit, it is provided between sleeve pipe and connecting tube for propping up the second butterfly spring of pump barrel；The fixing ball valve unit for being connected with sleeve pipe, being located at below plunger unit.

Description

Oil well pump

Technical field

The present invention relates to technical field of petroleum extraction, more particularly to a kind of oil well pump.

Background technology

In recent years, as oil field development enters the heavy oil development technology such as the lifting such as middle and later periods, steam drive, SAGD, horizontal well Extensively apply in Liaohe Oil Field, the Lifting Technique difficult problem such as bottom hole temperature (BHT) is high, lifting rate demand is big, corrosivity enhancing becomes increasingly conspicuous, By taking SAGD as an example, liquid demand 300m is produced daily³/ d, up to 240 DEG C of bottom hole temperature (BHT), H in the well of part₂S contents reach 1400ppm with On, the lifting technology equipment for adopting at present can barely substantially meet production requirement, but as bottom hole temperature (BHT) is constantly raised, corrode Property medium separate out in a large number, chemical attack phenomenon is aggravated, and the impact of the comprehensive function of these unfavorable factors to lifting equipment is very big, special It is not the progressively enforcement of multimedium combination S AGD production technique, while improving yield, occurs in that more serious high temperature, corrosion yet Phenomenon, has a strong impact on lifting equipment stability and service life.Meanwhile, drive in deep-well lifting technology, due to lower pump depth in steam When the deeper 1500-2000 rice of degree, pump barrel and plunger adopt metal material, linear expansion coefficient is of a relatively high, and oil well pump is in certain liquid Under column pressure, radial displacement is produced, causes oil well pump normal working hours gap unstable, easily cause holddown phenomenon, affect lifting Technique pump detection period.

At present in sucker rod pump Lifting Technique, oil pump sleeve and plunger adopt metal material in selection substantially, in recent years, In the ceramic pump lifting technology technology for developing both at home and abroad, its important composition part plunger adopts ceramic composite structures, but As metalwork and pottery have the difference of linear expansion coefficient, and ceramic plunger is unreasonable in structure design with metallic matrix, There is ceramic plunger and the phenomenons such as hardware dislocation, ceramic plunger fracture, directly result in holddown, wastage increase etc. and ask Topic, has a strong impact on produced on-site.

Content of the invention

In order to overcome the drawbacks described above of prior art, embodiment of the present invention technical problem to be solved to there is provided one kind Oil well pump, its can solve the problem that ceramic plunger and metallic matrix irrational problem in structure.

The concrete technical scheme of the embodiment of the present invention is：

A kind of oil well pump, including：

Pump barrel unit, pump barrel unit include the outer tube being made of metal with the multistage being arranged in the outer tube by pottery system Into pump barrel, be provided with the first packing ring between the pump barrel of adjacent segment, the length of the length of the outer tube less than the pump barrel；

The plunger unit being arranged in the pump barrel, the plunger unit include upward-traveling valves unit, pass through to connect on plunger The inner tube being made of metal that is connected with the upward-traveling valves unit of head, be arranged on outside said inner tube by pottery make many Duan Zhusai, be connected to said inner tube and the plunger by plunger lower contact below lower travelling valve unit, adjacent segment described Second packing ring is provided between plunger, the first butterfly spring between the plunger top connection and the plunger, is provided with, described One butterfly spring lower end is used for the upper end for propping up the plunger, and the maximum pretightning force of the state of applanation of first butterfly spring is full The first preset relation of foot；

The sleeve pipe being connected with the outer tube, is connected with described sleeve pipe for propping up the connecting tube of the plunger unit, institute State and be provided between sleeve pipe and the connecting tube for propping up the second butterfly spring of the pump barrel；

The fixing ball valve unit for being connected with described sleeve pipe, being located at below the plunger unit.

Preferably, the total length of all sections of the pump barrel and the ratio of the total length of the outer tube are in 1.00167- 1.00134 between.

Preferably, the outer tube is made up of Steel material, and the outer tube is installed using hot charging technology with the pump barrel and coordinated.

Preferably, the thickness of the outer tube is 3mm.

Preferably, first packing ring and the second packing ring are made up of stainless steel material.

Preferably, the stroke of the oil well pump is more than or equal to 8 meters, and the length of the pump barrel is at least 7800mm, the pump The hop count of cylinder is at least 26 sections.

Preferably, the total length of plunger described in multistage is at least 900mm, and multistage plunger carries out axially position dress by inner tube Match somebody with somebody and form.

Preferably, the hop count of the plunger meets the second preset relation with the length of plunger per section described.

Preferably, the hop count of the pump barrel meets the 3rd preset relation with the length of every section of pump barrel.

Preferably, first preset relation is specially：

K₄=1

C=D/d

Wherein, D represents that the external diameter of the butterfly spring, d represent that the internal diameter of the butterfly spring, E represent the butterfly bullet The elasticity modulus of materials of spring, μ represent that Poisson's ratio, Pc represent the maximum pretightning force of state of applanation, the pressure of first butterfly spring The maximum pretightning force of level state is as far as possible more than or equal to the maximum pretightning force of calculated state of applanation in the first preset relation.

Preferably, second preset relation is：The hop count of the plunger is big with the product of the length of plunger per section described In equal to 900mm.

Preferably, the 3rd preset relation is：The product of the hop count of the pump barrel and the length of every section of pump barrel more than etc. In 7800mm.

Preferably, the length of every section of pump barrel is less than or equal to 300mm.

Preferably, the end face of the side wall of the plunger has oblique angle, the oblique angle be in inward slant trend, the post of adjacent segment There is space between plug, the second packing ring is arranged in the space.

Technical scheme has following notable beneficial effect：

1st, the oil well pump in the application is compared with metal oil well pump, the pump barrel being made up of pottery and plunger at high temperature swollen Bulk is almost nil, as, during oil pumping pump operation, pump barrel and plunger can produce displacement repeatedly between the two, thus, Even if still may insure that the plunger fitting clearance of the pump barrel and pottery of pottery is stable and accurate at high operating temperatures, be not in The problem of leakage rate increase.

When the 2nd, running under the oil well pump in the application, between plunger that segmentation is made up of pottery and the first packing ring be not in Inconsistent phenomenon, within ceramic pump barrel series connection precision reaches 0.05mm, meets required precision, and ceramic plunger runs flat in pump barrel Surely, without holddown problem.

3rd, the oil well pump in the application is provided with the first butterfly spring above plunger, is provided with below pump barrel Two butterfly springs, so that oil well pump greatly reduces the plunger and pump barrel appearance fracture being made up of pottery in normal work The possibility of phenomenon.

Description of the drawings

Accompanying drawing described here is only used for task of explanation, and is not intended to by any way limit model disclosed by the invention Enclose.In addition, shape and proportional sizes of each part in figure etc. are only schematically, the understanding of the present invention is used to help, and It is not the shape and proportional sizes for specifically limiting each part of the invention.Those skilled in the art under the teachings of the present invention, can Implement the present invention to select various possible shapes and proportional sizes as the case may be.

Fig. 1 is the structural representation of oil well pump embodiment middle and upper part of the present invention.

Fig. 2 is the structural representation at middle part in oil well pump embodiment of the present invention.

Fig. 3 is the structural representation of oil well pump embodiment middle and lower part of the present invention.

Fig. 4 is plunger partial structural diagram in oil well pump embodiment of the present invention.

The reference of the figures above：

1st, top connection；2nd, connection mechanism is dragged；3rd, pump barrel unit；31st, outer tube；32nd, pump barrel；33rd, the first packing ring；41st, upper travelling Valve cell；411st, upward-traveling valves valve pocket；412nd, upward-traveling valves valve ball；413rd, upward-traveling valves valve seat；42nd, plunger top connection；43rd, interior Pipe；44th, plunger；45th, plunger lower contact；46th, lower travelling valve unit；461st, lower travelling valve valve bonnet；462nd, lower travelling valve valve ball； 463rd, lower travelling valve valve seat；47th, second packing ring；48th, plunger bushing；5th, the first butterfly spring；6th, sleeve pipe；7th, connecting tube；8th, second Butterfly spring；9th, fixing ball valve unit；91st, fixing ball valve valve pocket；92nd, fixing ball valve valve ball；93rd, valve seat of fixed ball valve；94th, One box cupling；95th, the second box cupling；96th, push rod；97th, spring；98th, spring base；99th, valve body；10th, uncoupling pawl mechanism.

Specific embodiment

In conjunction with the description of accompanying drawing and the specific embodiment of the invention, the details of the present invention can be clearly understood.But It is, the specific embodiment of invention described herein to be only used for explaining the purpose of the present invention, and can not understands by any way Into being limitation of the present invention.Under the teachings of the present invention, technical staff is contemplated that any possible change based on the present invention Shape, these are regarded as belonging to the scope of the present invention.

In order to solve ceramic plunger 44 and metallic matrix irrational problem in structure, full ceramic oil-pump is ultimately formed Lifting Technique, for meeting the heavy crude heat extraction oil well Lifting Technique demand such as steam drive, SAGD, and carries for heavy oil developments such as SAGD For reliable technical support, and then help to form a set of efficient, DP technology of high yield, propose a kind of oil pumping in this application Pump, Fig. 1 are the structural representation of oil well pump embodiment middle and upper part of the present invention, and Fig. 2 is middle part in oil well pump embodiment of the present invention Structural representation, Fig. 3 are the structural representation of oil well pump embodiment middle and lower part of the present invention, pump configuration of pumping in Fig. 1, Fig. 2, Fig. 3 A complete oil well pump is joined together to form, as shown in Figure 1, Figure 2, Figure 3 shows, the oil well pump includes：Pump barrel unit 3, pump barrel Unit 3 includes the pump barrel 32 that the outer tube 31 being made of metal and the multistage being arranged in outer tube 31 are made up of pottery, adjacent segment The first packing ring 33 is provided between pump barrel 32, and the diameter of outer tube 31 is less than the diameter of pump barrel 32；The plunger being arranged in pump barrel 32 Unit 4, plunger unit 4 include upward-traveling valves unit 41, pass through what 44 top connection 421 of plunger was connected with upward-traveling valves unit 41 The inner tube 43 being made of metal, the multistage plunger 44 being made up of pottery being arranged on outside inner tube 43, is connected by plunger lower contact 45 Lower travelling valve unit 46 below being connected on inner tube 43 and plunger 44, is provided with second packing ring 47, post between the plunger 44 of adjacent segment Fill in and between 44 top connections 421 and plunger 44, be provided with the first butterfly spring 5,5 lower end of the first butterfly spring is used for propping up plunger 44 Upper end, the maximum pretightning force of the state of applanation of the first butterfly spring 5 meets the first preset relation；The sleeve pipe being connected with outer tube 31 6, it is connected with sleeve pipe 6 for propping up the connecting tube 7 of plunger unit 4, is provided between sleeve pipe 6 and connecting tube 7 for propping up pump Second butterfly spring 8 of cylinder 32；The fixing ball valve unit 9 for being connected with sleeve pipe 6, being located at below plunger unit 4.

Oil well pump in the present invention is by the structure to the plunger 44 being made up of pottery, the knot of the pump barrel 32 being made up of pottery Structure and it is arranged on the first butterfly spring 5 and the second butterfly spring 8 in oil well pump and has carried out appropriate design or improvement, and then causes Whole oil well pump largely avoided the possibility that phenomenon of rupture occur in the plunger 44 be made up of pottery and pump barrel 32 in normal work Property, meanwhile, plunger 44 and the second packing ring 47 being made up of pottery will not occur inconsistent phenomenon, meanwhile, the pump barrel being made up of pottery 32 be connected in series after precision reach in 0.05mm, can meet required precision, the operation in the pump barrel 32 of the plunger 44 of pottery is flat Surely, without holddown problem.Secondly, designed by multistage, the plunger 44 of pottery can be greatly increased with 32 effective seal section of pump barrel, entered And fully meet clearance seal demand.Finally, compared with metal oil well pump, the pump barrel 32 and plunger 44 of pottery expand at high temperature Amount almost 0, still may insure that 44 fit clearance of plunger of the pump barrel 32 and pottery of pottery is stable and smart at high operating temperatures Really.

In order to further appreciate that the oil well pump in the present invention, which will be made further explanation below.Such as Fig. 2, Shown in Fig. 3, pump barrel unit 3 includes the pump barrel that the outer tube 31 being made of metal and the multistage being arranged in outer tube 31 are made up of pottery 32, it is the technique for employing segmental machining that pump barrel 32 is made up of multistage pottery, is to ensure the effective travel in the pump barrel 32 of plunger 44, Design 32 length of ceramic pump barrel is 7800mm, and then can meet 8 meters of stroke beam-pumping unit Production requirements, and ceramic pump barrel is typically selected Alumina ceramic material is made.In a kind of feasible embodiment, every segment length one of the pump barrel 32 that the pottery of segmentation is made As carry out axially position equal to less than 300mm, preferably 300mm, the pump barrel 32 being made up of 26 sections of potteries by metal outer pipe 31, Unified assembling under a certain pressure, it is ensured that assembly precision.By the way so that 32 length of pump barrel of the entirety for ultimately forming Reach 7800mm.Certain, every segment length of pump barrel 32 can be less than 300mm, and then the pump made of pottery using more multistage Cylinder 32 is carried out assembling and then causes overall length to be more than or equal to 7800mm.Every segment length of pump barrel 32 is less than or equal to 300mm's Reason is under current technological level, on the premise of guaranteeing machining accuracy, is made up of alumina ceramic material both at home and abroad The maximum controllable processing length of pump barrel 32 is only 300mm, and which cannot meet Lifting Technique demand, if processing length increase, precision Cannot ensure, in oil well pump, plunger 44 need to carry out in pump barrel 32 substantial amounts of move repeatedly, if 32 precision of pump barrel cannot reach Mark, then the service life in production process oil well pump will decline to a great extent, and various problems easily occur.

The first packing ring 33 is provided between each section of pump barrel 32 being made up of pottery, and the first packing ring 33 adopts stainless steel end face Packing ring, its can be made up of 1Cr18Ni9Ti materials, and first packing ring 33 can avoid connecing for ceramic 32 end face of pump barrel that makes Touch, and then can effectively prevent the mutual extruding between pump barrel 32, finally avoid 32 end face of pump barrel that breakage problem occurs.

The 32 outer outer tube 31 for being made of metal of pump barrel being made up of pottery, the outer tube 31 can open axial direction to pump barrel 32 The effect of positioning, the material of outer tube 31 can select No. 45 steel, and its thickness is 3mm or so, between metal outer pipe 31 and pump barrel 32 Installed using hot charging technology and coordinated, the structure design not only can protect pump barrel 32 during shaping, transport, assembling, with When can ensure that pump barrel 32 is assembled with outer tube 31, such as there is dimensional problem, can directly adjust the chi of the outer tube 31 being made of metal Very little.On 31 end face of outer tube, if 32 consistent size of pump barrel that the outer tube 31 that metal is made is made with pottery, in down-hole high temperature Under (more than 200 DEG C) condition of work, 31 axial expansion size of outer tube will be greater than the 32 axial expansion size of pump barrel that pottery is made, such as This will cause axile displacement between outer tube 31 and pump barrel 32, cause pump barrel 32 poorly sealed, by theory analysis, calculating, work as pump When the length of cylinder 32 is 7800mm, the length of outer tube 31 less than the total length of pump barrel 32 size between 10.4mm-13mm, excellent Selection of land, the length of outer tube 31 is 13mm less than the size of the length of pump barrel 32, thus, under the high temperature operating conditions of down-hole, metal The pump barrel 32 that the outer tube 31 that makes is made with pottery is basically identical on axial length.That is, the overall length of all sections of pump barrels The ratio of the total length of degree and outer tube is between 1.00167-1.00134.Meanwhile, the end face of the side wall of every section of pump barrel 32 has tiltedly Angle, oblique angle are in inside side slope trend.

Plunger unit 4 is arranged in pump barrel 32, and plunger unit 4 includes upward-traveling valves unit 41, passes through 44 top connection of plunger 421 inner tubes 43 being made of metal being connected with upward-traveling valves unit 41, be arranged on outside inner tube 43 by pottery make many Duan Zhusai 44, by plunger lower contact 45 be connected to inner tube 43 and plunger 44 below lower travelling valve unit 46.Upward-traveling valves list Unit 41 includes upward-traveling valves valve pocket 411, the upward-traveling valves valve ball 412 that can be moved in upward-traveling valves valve pocket 411 and can support Live in travelling valve valve ball 412 and the upward-traveling valves valve seat 413 in upward-traveling valves valve pocket 411 is set.411 lower end of upward-traveling valves valve pocket Be connected with 44 top connection 421 of plunger, upward-traveling valves valve seat 413 be fastened on 44 top connection 421 of plunger in upward-traveling valves valve pocket 411 it Between.The first butterfly spring 5 is provided between 44 top connection 421 of plunger and plunger 44, specifically, 44 top connection 421 of plunger is outer Side wall has lug boss, and the first butterfly spring 5 is set in 44 top connection 421 of plunger, the upper end of the first butterfly spring 5 can with convex The portion of rising offsets, and the lower end of the first butterfly spring 5 can be offseted with the upper end of inner tube 43.First butterfly spring 5 can adopt multigroup folded Plus mode, which is used for discharging the stress between plunger 44, can play elastic booster action during work, can be prevented effectively from by making pottery There are the phenomenons such as fracture in the plunger 44 that porcelain is made.The maximum pretightning force of the state of applanation of the first butterfly spring 5 meets first and presets Relation.First preset relation is specifically as follows：

K₄=1

C=D/d

Wherein, D represents that the external diameter of butterfly spring, d represent that the internal diameter of butterfly spring, E represent the elastic properties of materials of butterfly spring Modulus, μ represent that Poisson's ratio, Pc represent the maximum pretightning force of state of applanation.The maximum pretension of the state of applanation of the first butterfly spring 5 Maximum pretightning force of the amount of overcoming more than or equal to calculated state of applanation in the first preset relation.

In one embodiment, by taking 95 full ceramic pumps of φ as an example, structure design is carried out to disk spring, choose outer diameter D =90mm, internal diameter d=73mm.According to types of springs, it is 1.25-6.0mm that can select without supporting face thickness, it is contemplated that D/t ratios Value, it is 18 that can take t=5mm, i.e. D/t ratios, according to design manual, is A dimension serieses, then obtains：h₀/ t ≈ 0.40, material Material elastic modulus E=206000MPa, Poisson's ratio μ=0.3, h₀=2mm.

Disk spring LOAD FOR is carried out, computing formula is as follows：

C=D/d=1.233

For without supporting diaphragm flexures take：K₄=1；

Then the first disk spring load is：

Work as f=h₀When, i.e., when disk spring is flattened, above formula is reduced to

Can be obtained by calculating：The maximum pretightning force of the complete 44 disk spring state of applanation of ceramic pump plunger of φ 95 is at least needed 85800N to be reached.

It is arranged with, outside inner tube 43, the multistage plunger 44 being made up of pottery, the total length of multistage plunger 44 is at least 900mm, many Duan Zhusai 44 carries out axially position by inner tube 43 and is assembled, thus, using segmental machining technique can ensure that pump barrel 32 with Effective sealing between plunger 44, when the total length of multistage plunger 44 is at least 900mm, can meet between pump barrel 32 and plunger 44 Clearance seal demand.The hop count of plunger 44 need to meet the second preset relation, the i.e. section of plunger 44 with the length of every section of plunger 44 Number is more than or equal to 900mm with the product of the length of every section of plunger 44.In a feasible embodiment, plunger is typically made pottery by silicon nitride Porcelain is made, and under the state of the art, on the premise of machining accuracy is ensured, the maximum machining length of single hop plunger is 180mm, So in the present embodiment, the length of each section of plunger 44 is 180mm, and the hop count of plunger 44 is 5, and multistage plunger 44 leans on metal 43 axially position of inner tube, unified assembling under a certain pressure, it is ensured that assembly precision.Topmost the upper end of one section of plunger 44 is arranged There are plunger bushing 48, plunger bushing 48 to be used for fixing all of plunger 44 in lower section, can be provided between plunger bushing 48 and plunger 44 Second packing ring 47.According to silicon nitride ceramic material performance evaluation, when the material selection silicon nitride ceramics of plunger 44, which designs Thickness can be 8mm, thus, while 44 intensity of ceramic plunger is guaranteed, compared with metal plunger 44, which further can increase Liquid area of passage in big plunger 44.Second packing ring 47 is also equipped between the plunger 44 of adjacent segment, and second packing ring 47 is adopted Stainless steel end washer carries out auxiliary positioning, can be made up of 1Cr18Ni9Ti materials, its can avoid by pottery make every The end contact of one section of plunger 44, and then effectively prevent from mutually extruding between adjacent segment plunger 44 so that breaking occurs in 44 end face of plunger Split.Fig. 4 is 44 partial structural diagram of plunger in oil well pump embodiment of the present invention, as shown in figure 4, the side wall of each section of plunger 44 End face be respectively provided with certain oblique angle, the oblique angle there are space between the plunger 44 of adjacent segment in inward slant trend, second Packing ring 47 is arranged in the space.Thus, by its cooperation with second packing ring 47, it is ensured that end face when multistage plunger 44 is assembled Sealing effectiveness.By theoretical calculation, the inclination angle can be 40 ° or so, can not only cause 44 end face of plunger and second packing ring 47 high accuracy coordinate, and are also prevented from plunger 44 and misplace with second packing ring 47, and then improve sealing effectiveness.

The lower end of inner tube 43 has been threaded connection plunger lower contact 45, and the upper end of plunger lower contact 45 props up multistage plunger 44 lower end.The lower section of plunger lower contact 45 is connected with lower travelling valve unit 46, and lower travelling valve unit 46 includes lower travelling valve valve Cover 461, the lower travelling valve valve ball 462 that can be moved in lower travelling valve valve pocket and the connection of lower travelling valve valve bonnet 461 can simultaneously be propped up The lower travelling valve valve seat 463 of lower travelling valve valve ball 462.The lower end of lower travelling valve valve bonnet 461 is connected with plunger lower contact 45, plunger Lower contact 45 can be used for propping up lower travelling valve valve seat 463.

The lower end of outer tube 31 is connected with sleeve pipe 6, is connected with for propping up the connecting tube 7 of plunger unit 4, connection in sleeve pipe 6 Pipe 7 can be fixedly connected by modes such as screw threads with sleeve pipe 6, and the outer wall of connecting tube 7 has shoulder so that connecting tube 7 and sleeve pipe 6 Between have certain space, the second butterfly spring 8 can be provided with the space, the lower end of the second butterfly spring 8 is installed in On the shoulder of 7 outer wall of connecting tube, the upper end of the second butterfly spring 8 is used for propping up the multistage plunger 44 being made up of pottery, the second butterfly Shape spring 8 in the way of being superimposed using multigroup spring, and then can effectively discharge stress, can operationally play elastic auxiliary Effect, it is to avoid damaged because bearing up-down force collision occurs in oil pumping pump operation by the plunger 44 of ceramic making.Second butterfly bullet Spring 8 can be made using 60Si2Mn materials, and the calculating of its spring load is referred to the calculation of the first butterfly spring 5, This repeats no more.

Fixing ball valve unit 9 is connected to the lower end of sleeve pipe 6, and which is located at below plunger unit 4.Fixing ball valve unit 9 includes Valve body 99, second box cupling 95 of the first box cupling 94, circular tube shaped for connecing is sequentially connected with sleeve pipe 6 or connecting tube 7, is provided with valve body 99 Fixing ball valve valve pocket 91, the fixing ball valve valve ball 92 in the fixing ball valve valve pocket 91, it is located in fixing ball valve valve pocket 91 and the The valve seat of fixed ball valve 93 that mutually fixes between two box cuplings 95, is provided with, in the first box cupling 94, the spring base that mutually fixes with the first box cupling 94 98th, cylindrical push rod 96, spring 97, have projection on 96 outer wall of push rod, and 96 one end of push rod props up fixing ball valve valve ball 92, bullet Spring 97 is sheathed on outside push rod 96, and 97 one end of spring is mutually propped up with the projection of push rod 96, and the other end is mutually propped up with spring base 98.

Top connection 1 is connected with above plunger unit 4, uncoupling pawl mechanism 10 is internally provided with top connection 1.In upstream The upper end of dynamic valve cell 41 is connected with the on-off connector mechanism 2 being adapted with uncoupling pawl.Uncoupling pawl mechanism 10 is equal with on-off connector mechanism 2 For prior art, any improvement is not done to which in this application, be will not be described here.

The course of work of this oil well pump is as follows, overall with tubing string G.I.H specified location, uncoupling pawl mechanism 10 with take out Beam hanger post is connected, and with rod string G.I.H, when uncoupling pawl mechanism 10 enters pump barrel unit 3, working rig slow-down (is leaned on Sucker rod is conducted oneself with dignity) uncoupling pawl mechanism 10 opens, and on-off connector mechanism 2 is entered, is completed to dock, is above carried dead space, carry out oil pipe pressure test, 3MPa does not drop, and rises and takes out.During normal production, plunger unit is in the 3 interior motion with top uncoupling pawl mechanism 10, sucker rod of pump barrel unit Do upper and lower reciprocating motion.During upstroke, upward-traveling valves unit 41 and lower travelling valve unit 46 in plunger unit are closed, fixed Ball valve unit 9 is opened, and plunger unit drains into liquid in oil well pump in pump, and at the same time, in well, liquid is made in pump intake pressure reduction With under, enter through fixing ball valve unit 9 and the lower chambers full of pump；During down stroke, fixing ball valve unit 9 is closed, upward-traveling valves Unit 41 and lower travelling valve unit 46 are opened, and the liquid of lower chamber is shifted through upward-traveling valves unit 41 and lower travelling valve unit 46 Arrive upper chamber.The upper and lower continuous reciprocating motion of plunger unit, well liquid is constantly pumped into well head, enters gathering system.

In the description of the present application, it should be noted that unless otherwise prescribed and limit, term " installation ", " being connected ", " connection " should be interpreted broadly, for example, it may be mechanically connected or electrical connection, or the connection of two element internals, can Being to be joined directly together, it is also possible to be indirectly connected to by intermediary, for the ordinary skill in the art, can basis Concrete condition understands the concrete meaning of above-mentioned term.

Each embodiment in this specification is described by the way of going forward one by one, what each embodiment was stressed be with The difference of other embodiment, between each embodiment identical similar part mutually referring to.

Above-described embodiment technology design only to illustrate the invention and feature, its object is to allow person skilled in the art Scholar will appreciate that present disclosure and implement according to this, can not be limited the scope of the invention with this.All according to the present invention Equivalence changes or modification that Spirit Essence is made, should all be included within the scope of the present invention.

Claims

1. a kind of oil well pump, it is characterised in that include：

Pump barrel unit, the pump barrel unit include the outer tube being made of metal with the multistage being arranged in the outer tube by pottery system Into pump barrel, be provided with the first packing ring between the pump barrel of adjacent segment, the length of the length of the outer tube less than the pump barrel；

The plunger unit being arranged in the pump barrel, the plunger unit include upward-traveling valves unit, by plunger top connection with The inner tube being made of metal that the upward-traveling valves unit is connected, the multistage post being made up of pottery being arranged on outside said inner tube Plug, be connected to said inner tube and the plunger by plunger lower contact below lower travelling valve unit, the plunger of adjacent segment Between be provided with second packing ring, be provided with the first butterfly spring, first butterfly between the plunger top connection and the plunger Shape lower spring end is used for propping up the upper end of the plunger, the maximum pretightning force satisfaction of the state of applanation of first butterfly spring the One preset relation；

The sleeve pipe being connected with the outer tube, is connected with described sleeve pipe for propping up the connecting tube of the plunger unit, the set It is provided between pipe and the connecting tube for propping up the second butterfly spring of the pump barrel；

2. oil well pump according to claim 1, it is characterised in that the total length of all sections of the pump barrel and the outer tube Total length ratio between 1.00167-1.00134.

3. oil well pump according to claim 1, it is characterised in that the outer tube is made up of Steel material, the outer tube and institute State pump barrel and installed using hot charging technology and coordinate.

4. oil well pump according to claim 3, it is characterised in that the thickness of the outer tube is 3mm.

5. oil well pump according to claim 1, it is characterised in that first packing ring and the second packing ring are by stainless steel Material is made.

6. oil well pump according to claim 1, it is characterised in that the stroke of the oil well pump is more than or equal to 8 meters, the pump The length of cylinder is at least 7800mm, and the hop count of the pump barrel is at least 26 sections.

7. oil well pump according to claim 1, it is characterised in that the total length of plunger described in multistage is at least 900mm, many Duan Zhusai carries out axially position by inner tube and is assembled.

8. oil well pump according to claim 1, it is characterised in that the length of the hop count of the plunger and plunger per section described Meet the second preset relation.

9. oil well pump according to claim 1, it is characterised in that the hop count of the pump barrel is met with the length of every section of pump barrel 3rd preset relation.

10. oil well pump according to claim 1, it is characterised in that first preset relation is specially：

P_{c} = \frac{4 E}{1 - μ^{2}} \times \frac{t^{3} h_{0}}{K_{1} D^{2}} K_{4}^{2};

K_{1} = \frac{1}{π} \times \frac{{(\frac{C - 1}{C})}^{2}}{\frac{C + 1}{C - 1} - \frac{2}{\ln C}}

K₄=1

C=D/d

Wherein, D represents that the external diameter of the butterfly spring, d represent that the internal diameter of the butterfly spring, E represent the butterfly spring Elasticity modulus of materials, μ represent that Poisson's ratio, Pc represent the maximum pretightning force of state of applanation, the pressing shape of first butterfly spring The maximum pretightning force of state is as far as possible more than or equal to the maximum pretightning force of calculated state of applanation in the first preset relation.

11. oil well pumps according to claim 8, it is characterised in that second preset relation is：The hop count of the plunger It is more than or equal to 900mm with the product of the length of plunger per section described.

12. oil well pumps according to claim 9, it is characterised in that the 3rd preset relation is：The hop count of the pump barrel It is more than or equal to 7800mm with the product of the length of every section of pump barrel.

13. oil well pumps according to claim 12, it is characterised in that the length of every section of pump barrel is less than or equal to 300mm.

14. oil well pumps according to claim 1, it is characterised in that the end face of the side wall of the plunger has oblique angle, described There is space in inward slant trend between the plunger of adjacent segment in oblique angle, the second packing ring is arranged in the space.