Long stroke plunger pump with increased discharge and efficiency

Abstract

The utility model relates to oil well pump technology field, proposes a kind of long stroke and increases the long-stroke oil well pump of efficiency, including pump barrel, the upper end part of pump barrel is used to communicate upper production oil pipe;Plunger assembly, slidingly set in pump barrel, plunger assembly has oil passing chamber, first oil inlet and first oil outlet are opened in oil passing chamber, first oil inlet is used to oil, and first oil outlet is used to oil outlet;Pull rod piece, the upper end part of pull rod piece is slidingly set in oil passing chamber, the lower end part of pull rod piece passes first oil inlet, after pull rod piece sliding, the lower end part of pull rod piece opens or closes first oil inlet;Through above technical scheme, the normal operation of oil well pump is easily disturbed by gas in high gas content oil well in prior art, so that the problem that oil well pump cannot be stable pumping is solved.Make oil pump applicable to new capacity well, special well condition (such as sand, gas, scale, heavy oil etc.), and can be normal and stable operation, to reach the application effect of extension operation cycle.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil well pump technology field, specifically, relate to a long stroke increase row increase efficiency oil well pump. BACKGROUND

[0002] In the field of oil exploitation, the oil well pump is one of the key equipment. The traditional oil well pump has many limitations when facing complex oil well conditions. For example, in high gas content oil wells, gas easily interferes with the normal operation of the oil well pump, making the oil well pump unable to pump oil stably, seriously affecting the oil well production. In the sand-containing oil well, sand particles are easy to enter the gap between the pump cylinder and the plunger, causing the plunger and the pump cylinder to wear out, not only reducing the pump efficiency, but also easily causing the pump to be stuck, leading to the failure of the oil well pump, increasing the maintenance cost and the risk of production interruption. At the same time, for some oil wells with high crude oil viscosity, the traditional oil well pump is difficult to meet the normal production demand. Moreover, the plunger structure of the conventional oil well pump is single, and in the long-term operation process, due to uneven stress and other reasons, the eccentric wear phenomenon is easy to occur, which gradually reduces the sealing performance between the pump cylinder and the plunger, further affecting the pump efficiency and service life. SUMMARY

[0003] The utility model provides a long stroke increase row increase efficiency oil well pump, solve in related arts in high gas content oil well, gas easily interferes with the normal operation of the oil well pump, make the oil well pump unable to pump oil stably problem.

[0004] The technical scheme of the utility model is as follows:

[0005] A long stroke increase row increase efficiency oil well pump, comprising:

[0006] A pump cylinder, the upper end of the pump cylinder is used for communicating with the upper production oil pipe;

[0007] A plunger assembly is slidably arranged in the pump cylinder, the plunger assembly has an oil passing chamber, a first oil inlet and a first oil outlet are formed on the oil passing chamber, the first oil inlet is used for oil inlet, and the first oil outlet is used for oil outlet;

[0008] A pull rod is slidably arranged in the oil passing chamber at the upper end, the lower end of the pull rod passes through the first oil inlet, and the lower end of the pull rod opens or closes the first oil inlet after sliding.

[0009] As a further technical scheme, the plunger assembly comprises:

[0010] An upper plunger is slidably arranged in the pump cylinder, the upper plunger has an upper chamber, and the first oil outlet is located at the upper end of the upper chamber;

[0011] A lower plunger is rotatably arranged relative to the upper plunger, the lower plunger has a lower chamber, the first oil inlet is located at a lower end of the lower chamber, the upper chamber and the lower chamber are arranged in communication and form the oil passing chamber, and the pull rod member passes through the lower chamber and is arranged in sliding relative to the lower chamber.

[0012] As a further technical solution, a first oil passing opening is arranged at a lower end of the upper chamber, a second oil passing opening is arranged at an upper end of the lower chamber, and a third oil passing opening is arranged on an upper end side wall of the lower chamber.

[0013] A pull rod upper joint is arranged on the upper plunger, the pull rod upper joint has an intermediate chamber, and a fourth oil passing opening is arranged on the intermediate chamber; the intermediate chamber is used for connecting the upper chamber and the lower chamber.

[0014] A lower plunger pull rod is arranged on the pull rod upper joint, the lower plunger pull rod passes through the lower chamber and is arranged in sliding relative to the lower chamber.

[0015] A lower plunger floating valve ball is arranged on the lower plunger pull rod and is located below the first oil inlet; after the lower plunger pull rod slides, the lower plunger floating valve ball opens the first oil inlet and the pull rod upper joint closes the second oil passing opening, or the lower plunger floating valve ball closes the first oil inlet and the pull rod upper joint opens the second oil passing opening.

[0016] As a further technical solution, the lower plunger includes:

[0017] A lower plunger member is arranged in sliding in the pump barrel, and the lower chamber is located on the lower plunger member.

[0018] A lower plunger upper valve cover is arranged at an upper end of the lower plunger member, and the second oil passing opening and the third oil passing opening are arranged on the lower plunger upper valve cover.

[0019] A lower plunger floating valve seat is arranged at a lower end of the lower plunger member, and the first oil inlet is located on the lower plunger floating valve seat.

[0020] As a further technical solution, the upper plunger includes:

[0021] An upper plunger member is arranged in sliding in the pump barrel.

[0022] A plunger upper valve cover is arranged at an upper end of the upper plunger member, and the first oil outlet is located on the plunger upper valve cover.

[0023] An upper plunger floating valve cover is arranged at a lower end of the upper plunger member, and the second oil passing opening is located on the upper plunger floating valve cover.

[0024] Upper plunger valve seat, disposed in the upper plunger valve cover;

[0025] Upper plunger valve ball, disposed in the upper plunger valve cover and below the upper plunger valve seat, the upper plunger valve ball is used to open or close the second oil passage after lifting.

[0026] As a further technical solution, further comprising:

[0027] Lower plunger spiral sand scraping block, disposed on the lower plunger valve ball.

[0028] As a further technical solution, the lower plunger spiral sand scraping block has a spiral groove on the outside.

[0029] As a further technical solution, further comprising:

[0030] Fixed valve cover, disposed on the pump barrel below the plunger assembly, the lower end of the fixed valve cover is provided with a fifth oil passage;

[0031] Fixed valve seat, disposed in the fixed valve cover;

[0032] Fixed valve ball, disposed in the fixed valve cover, the fixed valve ball opens or closes the fifth oil passage after lifting.

[0033] As a further technical solution, further comprising:

[0034] Sucker rod, slidingly disposed in the pump barrel, fixedly connected with the upper end of the plunger assembly, the sucker rod drives the plunger assembly to slide after sliding.

[0035] The working principle and beneficial effects of the utility model are as follows:

[0036] In the utility model, the plunger valve reinforced opening and closing structure combination is adopted, which can effectively cope with the influence of gas under the environment of high gas content oil well, make the oil well pump run stably, effectively avoid the gas lock phenomenon, and ensure that the oil well production process will not be damaged or the efficiency will be greatly reduced due to gas problems. BRIEF DESCRIPTION OF DRAWINGS

[0037] The above characteristics, technical features, advantages and implementation modes of the utility model will be further described in the following clear and understandable manner combined with the description of preferred embodiments and the attached drawings.

[0038] Figure 1 It is a structural schematic view of the pump barrel inside the utility model;

[0039] Figure 2 It is Figure 1 It is a local enlarged view of A in the middle.

[0040] Figure 3 For Figure 1 A local enlarged view at B in the middle;

[0041] Figure 4 For Figure 1 A local enlarged view at C in the middle;

[0042] Figure 5 It is the structural schematic view of the whole outside of the utility model.

[0043] In the drawing: 1, pump cylinder, 2, upper production oil pipe, 3, plunger assembly, 4, oil passing chamber, 5, first oil inlet, 6, first oil outlet, 7, pull rod piece, 8, upper plunger, 9, upper chamber, 10, lower plunger, 11, lower chamber, 12, first oil passing port, 13, second oil passing port, 14, third oil passing port, 15, pull rod upper joint, 16, middle chamber, 17, fourth oil passing port, 18, lower plunger pull rod, 19, lower plunger traveling valve ball, 20, lower plunger piece, 21, lower plunger upper valve cover, 22, lower plunger traveling valve seat, 23, upper plunger piece, 24, plunger upper valve cover, 25, upper plunger traveling valve cover, 26, upper plunger traveling valve seat, 27, upper plunger traveling valve ball, 28, lower plunger helical scraping block, 29, helical groove, 30, fixed valve cover, 31, fifth oil passing port, 32, fixed valve seat, 33, fixed valve ball, 34, sucker rod, 35, balance tail pipe. DETAILED DESCRIPTION

[0044] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the specific implementation manners of the present application will be described below with reference to the drawings. Obviously, the drawings in the following description only represent some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without creative labor, and other embodiments can also be obtained.

[0045] In order to make the drawing simple, only the parts related to the utility model are shown in each drawing, which does not represent the actual structure of the product. In addition, in order to make the drawing simple and easy to understand, in some drawings, only one of the parts with the same structure or function is shown, or only one of them is marked. In this paper, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0046] In this article, it is necessary to explain that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0047] In addition, in the description of the present application, the terms "first", "second" and the like are only used for differentiation and description, and cannot be understood as indicating or implying relative importance.

[0048] Reference Figures 1 to 5 For the first embodiment of the utility model, a long-stroke increased discharge and efficiency oil pump is provided, comprising a pump barrel 1, a plunger assembly 3 and a pull rod 7; wherein the plunger assembly 3 is slidably arranged in the pump barrel 1, the plunger assembly 3 has an oil passing chamber 4 inside, the oil passing chamber 4 has a first oil inlet 5 and a first oil outlet 6, the first oil inlet 5 is used for oil inlet, and the first oil outlet 6 is used for oil outlet; the upper end of the pull rod 7 is slidably arranged in the oil passing chamber 4, the lower end of the pull rod 7 passes through the first oil inlet 5, and after the pull rod 7 slides, the lower end of the pull rod 7 opens or closes the first oil inlet 5.

[0049] Further, the structure of the plunger assembly 3 is refined, and the plunger assembly 3 specifically comprises an upper plunger 8 and a lower plunger 10; the upper plunger 8 is slidably arranged in the pump barrel 1, and the upper plunger 8 has an upper chamber 9, and the first oil outlet 6 is located at the upper end of the upper chamber 9; the lower plunger 10 is rotatably arranged relative to the upper plunger 8, and the lower plunger 10 has a lower chamber 11, and the first oil inlet 5 is located at the lower end of the lower chamber 11; the upper chamber 9 and the lower chamber 11 are in communication with each other and form the oil passing chamber 4.

[0050] Further, the structure of the pull rod 7 is refined, and the pull rod 7 specifically comprises a pull rod upper joint 15, a lower plunger pull rod 18 and a lower plunger traveling valve ball 19; the pull rod upper joint 15 is arranged on the upper plunger 8, and the pull rod upper joint 15 has an intermediate chamber 16, and the fourth oil inlet 17 is formed in the intermediate chamber 16; the intermediate chamber 16 is used for connecting the upper chamber 9 and the lower chamber 11; the lower plunger pull rod 18 is arranged on the pull rod upper joint 15, and the lower plunger pull rod 18 passes through the lower chamber 11 and is slidably arranged relative to the lower chamber 11; the lower plunger traveling valve ball 19 is arranged on the lower plunger pull rod 18 and located below the first oil inlet 5; after the lower plunger pull rod 18 slides, the lower plunger traveling valve ball 19 opens the first oil inlet 5 and the pull rod upper joint 15 closes the second oil inlet 13, or the lower plunger traveling valve ball 19 closes the first oil inlet 5 and the pull rod upper joint 15 opens the second oil inlet 13.

[0051] Further to the structure of the lower plunger 10, the lower plunger 10 specifically comprises a lower plunger part 20, a lower plunger upper valve cover 21 and a lower plunger traveling valve seat 22; the lower plunger part 20 is slidingly arranged in the pump barrel 1, and the lower chamber 11 is located on the lower plunger part 20; the lower plunger upper valve cover 21 is arranged at the upper end of the lower plunger part 20, and the second oil passage 13 and the third oil passage 14 are arranged on the lower plunger upper valve cover 21; the lower plunger traveling valve seat 22 is arranged at the lower end of the lower plunger part 20, and the first oil inlet 5 is located on the lower plunger traveling valve seat 22.

[0052] Further to the structure of the upper plunger 8, the upper plunger 8 specifically comprises an upper plunger part 23, a plunger upper valve cover 24, an upper plunger traveling valve cover 25, an upper plunger traveling valve seat 26 and an upper plunger traveling valve ball 27; the upper plunger part 23 is slidingly arranged in the pump barrel 1; the plunger upper valve cover 24 is arranged at the upper end of the upper plunger part 23, and the first oil outlet 6 is located on the plunger upper valve cover 24; the upper plunger traveling valve cover 25 is arranged at the lower end of the upper plunger part 23, and the second oil passage 13 is located on the upper plunger traveling valve cover 25; the upper plunger traveling valve seat 26 is arranged in the upper plunger traveling valve cover 25; the upper plunger traveling valve ball 27 is arranged in the upper plunger traveling valve cover 25 and below the upper plunger traveling valve seat 26, and the upper plunger traveling valve ball 27 is used to open or close the second oil passage 13 after being lifted.

[0053] Further, the lower plunger helical sand scraping block 28 is added on the lower plunger traveling valve ball 19.

[0054] Further, the helical groove 29 is added on the lower plunger helical sand scraping block 28.

[0055] Further, the fixed valve cover 30, the fixed valve seat 32 and the fixed valve ball 33 are added; the fixed valve cover 30 is arranged on the pump barrel 1 and below the plunger assembly 3, and the lower end of the fixed valve cover 30 is provided with the fifth oil passage 31; the fixed valve seat 32 is arranged in the fixed valve cover 30; the fixed valve ball 33 is arranged in the fixed valve cover 30 and can be lifted to open or close the fifth oil passage 31.

[0056] Further, the oil pumping rod 34 is added, which is slidingly arranged in the pump barrel 1 and fixedly connected with the upper end of the plunger assembly 3, and the oil pumping rod 34 drives the plunger assembly 3 to slide after being lifted.

[0057] In this embodiment, the pump barrel 1 is taken as a basic component, the fixed valve cover 30 is arranged at the corresponding position of the bottom end of the pump barrel 1, the lower end of the fixed valve cover 30 is connected with the balance tail pipe 35, and the fixed valve ball 33 is located between the fixed valve seat 32 and the fifth oil passage 31 and can be lifted to slide. The opening or closing operation of the fifth oil passage 31 is realized by the lifting movement of the fixed valve ball 33, so as to control the inflow and cut-off of the underground oil.

[0058] The upper plunger 8, the pull rod 7 and the lower plunger 10 are assembled in sequence from top to bottom as the upper plunger valve cover 24, the upper plunger 23, the upper plunger valve seat 26, the upper plunger valve ball 27, the upper plunger valve cover 25, the upper pull rod joint 15, the lower plunger pull rod 18, the lower plunger upper valve cover 21, the lower plunger 20, the lower plunger valve seat 22, the lower plunger valve ball 19 and the lower plunger spiral scraper 28; wherein the lower plunger pull rod 18 passes through the lower plunger upper valve cover 21, the lower plunger 20 and the lower plunger valve seat 22 in sequence; the lower plunger valve ball 19 is located below the first oil inlet 5; and the assembled plunger assembly 3 is slidably arranged in the pump barrel 1.

[0059] The sucker rod 34 is installed in the pump barrel 1 and fixedly connected with the upper end of the upper plunger valve cover 24; the sucker rod 34 slides up and down in the pump barrel 1 by the power provided by an external power driver, thereby driving the upper plunger 8, the pull rod 7 and the lower plunger 10 to slide up and down in the pump barrel 1.

[0060] During operation, the plunger assembly 3 is divided into two processes of upstroke and downstroke, and cycles reciprocally; for example, the plunger assembly 3 is first slid upward, and the upper production oil pipe 2, the upper chamber 9, the intermediate chamber 16, the lower chamber 11 and the balance tail pipe 35 are all filled with oil.

[0061] When the sucker rod 34 drives the plunger assembly 3 to move upward, the sucker rod 34 drives the upper plunger valve cover 24, the upper plunger part 23, the upper plunger traveling valve seat 26 and the upper plunger traveling valve cover 25 to slide upward at the same time; the upper plunger traveling valve cover 25 slides upward, and the upper plunger traveling valve ball 27 slides downward relative to the upper plunger traveling valve cover 25, thereby closing the first oil passage 12; with the upward sliding of the upper plunger valve cover 24, the oil in the upper production pipe 2 is pushed out, thereby realizing the discharge production of the oil. When the sucker rod 34 moves upward, the sucker rod 34 drives the pull rod upper joint 15, the lower plunger pull rod 18, the lower plunger traveling valve seat 22 and the lower plunger spiral sand scraping block 28 to slide upward at the same time through the upper plunger traveling valve cover 25; the lower plunger part 20 slides downward relative to the lower plunger pull rod 18, the pull rod upper joint 15 gradually moves away from the second oil passage 13 and finally is in a separated state, and the second oil passage 13 is in an open state; the lower plunger traveling valve ball 19 gradually approaches the first oil inlet 5 and is in extrusion contact, thereby closing the first oil inlet 5; at this time, the lower plunger traveling valve seat 22, the lower plunger part 20 and the lower plunger upper valve cover 21 move upward together with the pull rod upper joint 15; with the closing of the first oil inlet 5, when the lower plunger traveling valve seat 22 slides upward, the space volume between the fixed valve cover 30 and the lower plunger traveling valve seat 22 becomes larger, the pressure becomes smaller, the oil in the balance tail pipe 35 surges upward and drives the fixed valve ball 33 to rise, thereby making the fifth oil passage 31 in an open state, and the oil in the balance tail pipe 35 enters and is stored in the space between the fixed valve cover 30 and the lower plunger traveling valve seat 22; the oil lifting discharge production is realized, and the underground oil is collected to the ground.

[0062] After the sucker rod 34 slides to the uppermost position, the oil lifting discharge production is stopped, at this time, the sucker rod 34 slides downward, and the plunger assembly 3 starts the downstroke operation.

[0063] When the sucker rod 34 slides downward, the sucker rod 34 drives the upper plunger valve cover 24, the upper plunger 23, the upper plunger traveling valve seat 26, the upper plunger traveling valve cover 25, the pull rod upper joint 15, the lower plunger pull rod 18 and the lower plunger spiral sand scraping block 28 to slide downward at the same time; the upper plunger traveling valve ball 27 slides upward relative to the upper plunger traveling valve seat 26, the upper plunger traveling valve ball 27 is separated from the second oil passage 13, and the second oil passage 13 is in an open state; the lower plunger 20 slides upward relative to the lower plunger pull rod 18, and the pull rod upper joint 15 gradually approaches the third oil passage 14 until the third oil passage 14 is closed; the fourth oil passage 17 is always in an open state; the lower plunger traveling valve ball 19 is separated from the first oil inlet 5, and the first oil inlet 5 is in an open state; at the same time, when the lower plunger spiral sand scraping block 28 slides downward, the oil between the fixed valve cover 30 and the lower plunger traveling valve seat 22 is extruded downward to the fixed valve ball 33, and the fixed valve ball 33 closes the fifth oil inlet; at this time, the oil stored in the fixed valve cover 30 passes through the spiral groove 29 on the lower plunger spiral sand scraping block 28, the first oil inlet 5, the fourth oil passage 17 and the second oil passage 13 in turn, and enters the upper chamber 9; the original oil in the upper chamber 9 enters the upper production oil pipe 2 through the first oil outlet 6; the oil inlet is completed, and the oil lifting and production is prepared.

[0064] When the sucker rod 34 slides downward to the lowermost position, the sucker rod 34 starts to slide upward to perform the upstroke operation, and the process is repeated to realize the oil inlet and the oil lifting and production.

[0065] During the process, the upper plunger 8 and the lower plunger traveling valve ball 19 form a forced opening and closing structure combination through the fixed connection between the upper plunger 8, the pull rod upper joint 15 and the lower plunger traveling valve ball 19, which can effectively cope with the influence of gas, make the oil pump run stably, effectively avoid the gas lock phenomenon, and ensure that the oil well will not fail or the efficiency will not decrease greatly due to gas problems during production.

[0066] The lower plunger 10 is a free body and can rotate along the lower plunger pull rod 18, and its outer surface can be uniformly worn during a long production process. Even if the upper plunger 8 appears to be worn, due to the rotation characteristics of the lower plunger 10, the annular gap between the pump barrel 1 and the lower plunger 10 can still be in a relatively stable state, and the overall sealing effect is good, so as to ensure stable pump efficiency and reduce maintenance and production interruption caused by sealing problems.

[0067] The up-and-down sliding of the lower plunger screw sand scraping block 28 enhances the righting function of the plunger assembly 3, effectively reduces the influence of the alternating stress generated by the reciprocating movement of the sucker rod 34 on the lower plunger pull rod 18 under forced opening and closing, and avoids the premature failure of the lower plunger pull rod 18. When the remaining lower screw sand scraping block slides in the pump barrel 1, it not only has the functions of scale prevention and sand scraping, but also accelerates the flow of the liquid in the pipe through the screw groove 29, so that the forced discharge of the liquid in the pipe is not affected, and the pump jamming problem can be effectively avoided in the oil well with a sand content of about 5%, thereby improving the adaptability of the oil well pump to complex oil well environments.

[0068] The oil well pump can normally operate in the oil well with the liquid viscosity of the crude oil ≤600 centipoise, thereby widening the application range of the oil well pump and meeting the oil pumping demand of various oil wells with different properties, without frequent replacement of the oil well pump equipment due to the viscosity problem, so as to reduce the production cost and equipment maintenance cost.

[0069] The plunger assembly 3 has a double insurance function in the overall upper-and-lower combined structure. When one part of the plunger fails or wears out, the other part can still maintain a certain working capacity, thereby prolonging the overall service life of the oil well pump, improving the reliability and durability of the equipment, reducing the equipment update frequency, and being conducive to the long-term stable production of the oil well.

[0070] With the help of the forced opening and closing structure combination, the length of the pump barrel 1 can be lengthened, so that the pump barrel 1 exceeds the existing conventional 7m specification and reaches about 10m. Meanwhile, the conventional oil well pump has two plunger valve ball valve seats, and the present scheme removes one conventional bowl type pump valve ball valve seat and replaces it with the pull rod piece 7 for forced opening. Through the reversing movement of the sucker rod 34, when the sucker rod 34 goes down, the lower plunger pull rod 18 takes the lower plunger traveling valve ball 19 away from the lower plunger traveling valve seat 22, opens the first oil inlet 5 on the lower plunger traveling valve seat 22, and prevents the oil leakage in the oil well pump.

[0071] The oil liquid sucked from the underground oil well contains fine sand, which is mixed with the liquid and easily deposited in the pump barrel 1. The lower plunger screw sand scraping block 28 can stir the oil liquid when it slides up and down to prevent the sand from being deposited in the pump barrel 1. The lower plunger screw sand scraping block 28 prevents the sand from adhering to the inner wall of the pump barrel 1 and is forced to be scraped off. Meanwhile, the oil liquid at the bottom of the oil well contains carbonates, which form scale under the action of chemical batteries and adhere to the inner wall of the pump barrel 1, causing the jamming phenomenon. The lower plunger screw sand scraping block 28 is a screw block with a screw groove 29 on the outer surface. When the lower plunger pull rod 18 goes down, the screw groove 29 can guide and accelerate the flow, increase the flow rate of the liquid, and improve the pump efficiency. Special materials can be used to manufacture the device for special operating conditions.

[0072] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application, and all should be covered in the scope of the claims of the present application.

Claims

1. A long stroke, high capacity, high efficiency oil well pump, characterized in that, The utility model relates to a pump barrel (1) upper end part is used to communicate upper production oil pipe (2); Plunger assembly (3) is arranged in the pump barrel (1) and has the oil cavity (4), and the first oil inlet (5) and the first oil outlet (6) are arranged on the oil cavity (4), and the first oil inlet (5) is used to enter oil, and the first oil outlet (6) is used to export oil; Pull rod piece (7) upper end part is arranged in the oil cavity (4) and is passed through the first oil inlet (5), and the pull rod piece (7) is slid, and the lower end of pull rod piece (7) opens or closes the first oil inlet (5). The plunger assembly (3) includes:

2. A long stroke capacity increasing and efficiency improving oil well pump of claim 1, wherein Upper plunger (8) is arranged in the pump barrel (1) and has the upper chamber (9), and the first oil outlet (6) is located on the upper end of the upper chamber (9); Lower plunger (10) is arranged in the pump barrel (1) and has the lower chamber (11), and the first oil inlet (5) is located on the lower end of the lower chamber (11), and the upper chamber (9) and the lower chamber (11) are communicated and form the oil cavity (4), and the pull rod piece (7) is passed through the lower chamber (11) and is slid relative to the lower chamber (11). The lower end of the upper chamber (9) is provided with the first oil passage (12), the upper end of the lower chamber (11) is provided with the second oil passage (13), and the upper end of the lower chamber (11) is provided with the third oil passage (14) on the side wall.

3. A long stroke capacity increasing and efficiency improving oil well pump of claim 2, wherein The pull rod piece (7) includes: Pull rod upper connector (15) is arranged on the upper plunger (8), and the pull rod upper connector (15) has the intermediate chamber (16), and the fourth oil passage (17) is arranged on the intermediate chamber (16);The intermediate chamber (16) is used for communicating the upper chamber (9) and the lower chamber (11); Lower plunger pull rod (18) is arranged on the pull rod upper connector (15), and the lower plunger pull rod (18) is passed through the lower chamber (11) and is slid relative to the lower chamber (11); Lower plunger floating valve ball (19) is arranged on the lower plunger pull rod (18) and is located below the first oil inlet (5), and the lower plunger pull rod (18) is slid, and the lower plunger floating valve ball (19) is driven to open the first oil inlet (5) and the pull rod upper connector (15) closes the second oil passage (13), or the lower plunger floating valve ball (19) closes the first oil inlet (5) and the pull rod upper connector (15) opens the second oil passage (13).

4. A long stroke capacity increasing and efficiency improving oil well pump of claim 3, wherein The lower plunger (10) includes: Lower plunger piece (20) is arranged in the pump barrel (1), and the lower chamber (11) is located on the lower plunger piece (20); A lower plunger upper valve cover (21) is arranged at the upper end of the lower plunger (20), and the second oil passage (13) and the third oil passage (14) are arranged on the lower plunger upper valve cover (21). A lower plunger movable valve seat (22) is arranged at the lower end of the lower plunger (20), and the first oil inlet (5) is arranged on the lower plunger movable valve seat (22).

5. A long stroke capacity increasing and efficiency improving oil well pump of claim 3, wherein The upper plunger (8) comprises: An upper plunger (23) is arranged in the pump barrel (1) in a sliding manner; A plunger upper valve cover (24) is arranged at the upper end of the upper plunger (23), and the first oil outlet (6) is arranged on the plunger upper valve cover (24); An upper plunger movable valve cover (25) is arranged at the lower end of the upper plunger (23), and the second oil passage (13) is arranged on the upper plunger movable valve cover (25); An upper plunger movable valve seat (26) is arranged in the upper plunger movable valve cover (25); An upper plunger movable valve ball (27) is arranged in the upper plunger movable valve cover (25) below the upper plunger movable valve seat (26) in a lifting manner, and the upper plunger movable valve ball (27) is used to open or close the second oil passage (13) after being lifted.

6. A long stroke capacity increasing and efficiency improving oil well pump of claim 3, wherein Further comprising: A lower plunger spiral sand scraping block (28) is arranged on the lower plunger movable valve ball (19).

7. A long stroke capacity increasing and efficiency improving oil well pump of claim 6, wherein The lower plunger spiral sand scraping block (28) has a spiral groove (29) on the outer side.

8. A long stroke capacity increasing and efficiency improving oil well pump of claim 1, wherein Further comprising: A fixed valve cover (30) is arranged on the pump barrel (1) below the plunger assembly (3), and a fifth oil passage (31) is arranged at the lower end of the fixed valve cover (30); A fixed valve seat (32) is arranged in the fixed valve cover (30); A fixed valve ball (33) is arranged in the fixed valve cover (30) in a lifting manner, and the fixed valve ball (33) is used to open or close the fifth oil passage (31) after being lifted.

9. The long stroke capacity boosting and efficiency enhancing oil well pump, as recited in claim 1, characterized in that, Further comprising: A pumping rod (34) is arranged in the pump barrel (1) in a sliding manner and is fixedly connected to the upper end of the plunger assembly (3), and the pumping rod (34) drives the plunger assembly (3) to slide after being slid.

Images