CN212583677U - Hydraulic load-reducing oil pumping device - Google Patents

Abstract

A hydraulic pressure deloading oil pumping device, an upper pump barrel joint, a pump barrel, a lower pump barrel joint and an oil inlet valve are connected in sequence, the lower part of an upper oil pipe of a pump is connected with the upper part of the upper pump barrel joint, an oil outlet joint, a plunger and an oil outlet valve are connected in sequence, the oil outlet joint, the plunger and the pump barrel form a sealing pair, the oil outlet joint is provided with an oil outlet groove, a sucker rod downwards passes through the upper oil pipe of the pump and the lower part thereof is connected with the upper part of the oil outlet joint, the upper oil pipe of an upper segment of the pump, the upper joint of the deloading pump barrel, the deloading pump barrel and the lower joint of the deloading pump barrel are connected in sequence, the lower part of the deloading pump barrel joint is connected with the upper part of the upper oil pipe of the pump, the hollow sucker rod, the conversion joint, the deloading plunger and the communication joint are connected in sequence, the lower part of the hollow sucker rod, the deloading plunger and the joint is connected with the upper part of, the communicating joint is provided with a communicating groove, and the upper joint of the deloading pump barrel is provided with a communicating through hole.

Description

Hydraulic load-reducing oil pumping device

Technical Field

The invention relates to an oil pumping device for an oil field, in particular to a hydraulic load-reducing oil pumping device which is a device for reducing the load of an oil pumping unit and an upper sucker rod string and is used for increasing the pump-down depth of an oil well pump, increasing the submergence degree of the oil well pump and improving the filling degree of a deep pumping well.

Background

In a deep pumping well, the pumping unit and the pumping rod bear large liquid column load, so that on one hand, the pumping unit has large energy consumption, large power consumption, low mechanical efficiency, high oil well exploitation cost and poor economic benefit; on the other hand, the sucker rod has large working stress, is easy to be reported to be broken, has short service life, causes short production period of the pumping well, increases the operation cost of the oil well, reduces the production time of the oil well and reduces the economic benefit of the oil well.

In order to solve the problems, technicians develop devices for reducing the load of the sucker rod, such as Chinese patent 2012202957131< sucker rod load reducing device >, which aims to solve the problems. The outer diameter of the upper plunger is smaller than that of the lower plunger, the pressure of the upper part of the lower plunger is lower than that of the lower part of the lower plunger due to the balance hole, and an upward hydraulic pressure is arranged at the lower part of the lower plunger under the action of area difference and pressure difference, so that the load of the sucker rod connected to the oil outlet joint is reduced, the load of the oil pumping unit is also reduced, the service life of the sucker rod can be prolonged, and the production cycle of an oil well is prolonged. The load reducer is composed of two oil-well pumps with different pump diameters and serially connected plunger, the small pump cylinder is on the top and the big pump cylinder is on the bottom. The plunger of the oil pump and the plunger of the large pump barrel which are arranged at the lower part of the device can not pass through the small pump barrel, so that the device can be put into a well and connected with the oil pumping unit to work by adopting a disconnecting connector. Therefore, the Chinese patent 2012202957131 sucker rod deloading device can solve the problem of large liquid column load borne by the oil pumping unit and the sucker rod in the deep pumping well, but has the disadvantages of complex structure, poor reliability, short service life and high production cost, and can not achieve the ideal effect.

Disclosure of Invention

The invention aims to design a hydraulic load-reducing oil pumping device, which reduces the stress of a sucker rod string and an oil pumping unit, prolongs the service life of the sucker rod, reduces the electricity consumption of the oil pumping unit, and has the advantages of simple structure, high reliability, long service life and low processing cost.

The purpose of the invention is realized as follows: comprises an upper oil pipe, an upper joint of a load-reducing pump barrel, a hollow sucker rod, a crossover sub, a load-reducing pump barrel, a load-reducing plunger, a communication joint, a lower joint of the load-reducing pump barrel, a sucker rod, an upper oil pipe of a pump, an upper joint of the pump barrel, an oil outlet joint, a pump barrel, a plunger, an oil outlet valve, a lower joint of the pump barrel and an oil inlet valve, wherein the upper joint of the pump barrel, the lower joint of the pump barrel and the oil inlet valve are sequentially connected, all joints are kept sealed, the oil inlet valve is of a single-flow structure, well fluid can flow upwards from the lower part of the oil inlet valve, the well fluid cannot flow downwards from the upper part of the oil inlet valve, the lower part of the oil inlet valve is provided with an oil pipe thread, the upper part of the upper joint of the pump barrel is provided with an oil pipe internal thread, the lower part of the upper oil pipe of the pump is connected with the upper joint of the upper pump barrel, the oil outlet joint, the plunger piston and the pump barrel form a sealing pair, the oil outlet valve is of a single-flow structure, well fluid can flow upwards from the lower part of the oil outlet valve, the well fluid cannot flow downwards from the upper part of the oil outlet valve, an oil outlet groove is formed in the oil outlet joint, the well fluid in the plunger piston can flow onto the plunger piston through the oil outlet groove, sucker rod threads are arranged on the upper part of the oil outlet joint, the sucker rod downwards penetrates through the lower part of the oil pumping pipe on the pump and is connected with the upper part of the oil outlet joint, the upper section of the oil pipe, the upper joint of the load-reducing pump barrel, the load-reducing pump barrel and the lower joint of the load-reducing pump barrel are sequentially connected, the lower part of the lower joint of the load-reducing pump barrel is connected with the upper part of the oil pumping pipe on the pump, all the joints are kept sealed, the upper part of the conversion joint is provided with hollow sucker rod threads, the conversion joint, the load-reducing plunger piston and the, The oil-well pump comprises a conversion joint, a load-reducing plunger and a communication joint, wherein the conversion joint, the load-reducing plunger and the communication joint are arranged in a pump barrel, the lower part of the communication joint is provided with a screw thread of a pumping rod, the lower part of the communication joint is connected with the upper part of the pumping rod, the load-reducing plunger and the load-reducing pump barrel form a sealing pair, the pump diameter of the load-reducing pump barrel is larger than or equal to that of the pump barrel, the communication joint is provided with a communication groove, well fluid in a pump oil pipe can enter the hollow pumping rod through the communication groove, the pump diameter of the load-reducing pump barrel is larger than the outer diameter.

The invention has the beneficial effects that: under the action of pressure difference and area difference, the lower portion of the load-reducing plunger has an upward hydraulic pressure force to reduce the load of hollow sucker rod and oil pumping machine, so that it can prolong the service life of sucker rod and prolong the production period of oil well, and after the load of oil pumping machine is reduced, it can save electric energy. The through-hole that has set up on the deloading pump barrel top connection should ally oneself with on the through-hole is in the sunction inlet of pump, on the sheathed tube profit interface, makes in the interior crude oil of cover gets into upper segment oil pipe, makes in the interior hollow sucker rod of upper segment oil pipe is in crude oil, can alleviate the friction between hollow sucker rod and the upper segment oil pipe greatly, can improve greatly the utility model discloses a life.

Drawings

Figure 1 is an assembly drawing of the present invention.

Fig. 2 is an upper assembly view of the present invention.

Fig. 3 is a lower assembly view of the present invention.

Detailed Description

Embodiments of the present invention will be described below with reference to the drawings.

As shown in the figure, the embodiment of the invention comprises an upper-section oil pipe 1, an upper deloading pump cylinder joint 2, a hollow sucker rod 3, a conversion joint 4, a deloading pump cylinder 5, adeloading plunger 6, acommunication joint 7, a lower deloading pump cylinder joint 8, asucker rod 9, an upper pumpcylinder oil pipe 10, an upperpump cylinder joint 11, anoil outlet joint 12, apump cylinder 13, aplunger 14, anoil outlet valve 15, a lowerpump cylinder joint 16 and anoil inlet valve 17, wherein the upperpump cylinder joint 11, thepump cylinder 13, the lowerpump cylinder joint 16 and theoil inlet valve 17 are sequentially connected, all the joints are sealed, theoil inlet valve 17 is of a single-flow structure, well fluid can flow upwards from the lower part of theoil inlet valve 17 and cannot flow downwards from the upper part of theoil inlet valve 17, an oil pipe thread is arranged at the lower part of theoil inlet valve 17, an internal oil pipe thread is arranged at the upper part of the upperpump cylinder joint 11, the lower part of the upperpump oil pipe 10 is, Theoil outlet valve 15 is connected in sequence, the joint of the lower part of theplunger 14 and the upper part of theoil outlet valve 15 keeps sealed, theoil outlet joint 12, theplunger 14 and theoil outlet valve 15 are placed in thepump barrel 13, theplunger 14 and thepump barrel 13 form a sealing pair, theoil outlet valve 15 is of a uniflow structure, well fluid can flow upwards from the lower part of theoil outlet valve 15 and cannot flow downwards from the upper part of theoil outlet valve 15, theoil outlet joint 12 is provided with an oil outlet groove 12-1, the well fluid in theplunger 14 can flow to the upper part of theplunger 14 through the oil outlet groove 12-1, the upper part of theoil outlet joint 12 is provided with sucker rod threads, asucker rod 9 downwards penetrates through the lower part of the pumpupper oil pipe 10 to be connected with the upper part of theoil outlet joint 12, the upper oil pipe 1, the deloading pump barrel upper joint 2, the deloading pump barrel 5 and the deloading pump barrel lower joint 8 are connected in sequence, the lower part of the deloading pump barrel lower joint 8 is, the upper part of the adapter 4 is provided with hollow sucker rod threads, the hollow sucker rod 3, the adapter 4, thedeloading plunger 6 and thecommunication joint 7 are sequentially connected, the hollow sucker rod 3 and the adapter 4, the connecting parts of theload reducing plungers 6 are sequentially sealed, the lower part of the hollow sucker rod 3, the adapter 4, theload reducing plungers 6 and thecommunication connector 7 are arranged in thepump barrel 13, the lower part of thecommunication connector 7 is provided with sucker rod threads, the lower part of thecommunication connector 7 is connected with the upper part of thesucker rod 9, theload reducing plungers 6 and the load reducing pump barrel 5 form a sealing pair, the pump diameter of the load reducing pump barrel 5 is larger than or equal to that of thepump barrel 13, thecommunication connector 7 is provided with a communication groove 7-1, well liquid in theoil pumping pipe 10 can enter the hollow sucker rod 3 through the communication groove 7-1, the pump diameter of the load reducing pump barrel 5 is larger than the outer diameter of the hollow sucker rod 3, and the upper connector 2 of the load reducing pump barrel is provided with a communication hole 2-1.

When the well is run in, the well is put into according to the structure of figure 1, the upper part of the hollow sucker rod 3 is provided with a hollow polished rod, the hollow polished rod is matched with a polished rod sealer of the well mouth to seal the well mouth, and the pumped well liquid is discharged through the hollow polished rod. The upper part of the upper section oil pipe 1 is hung on a wellhead device (a Christmas tree).

The load-reducingplunger 6 and the load-reducing pump barrel 5 form a sealing pair, the pump diameter of the load-reducing pump barrel 5 is larger than that of thepump barrel 13, so that theplunger 14 can be lowered into thepump barrel 13 through the load-reducing pump barrel 5 (the pump diameter of thepump barrel 13 can also be equal to that of the load-reducing pump barrel 5, and theplunger 14 can be lowered into thepump barrel 13 through the load-reducing pump barrel 5 when the pump diameters of the two pump barrels are equal). The stroke of the sealing pair formed by the load-reducingplunger 6 and the load-reducing pump barrel 5 is equal to (or larger than) that of the sealing pair formed by theplunger 14 and thepump barrel 13, and the load-reducingplunger 6 and theplunger 14 always work in the respective pump barrels during oil pumping. The load-reducingplunger 6 can not go out of the load-reducing pump barrel 5 during oil pumping, so that the phenomenon that the oil pumping system is unstable due to sudden load increase of the oil pumping unit is avoided, and therefore the rod string is required to be accurately equipped. The pressure at the lower end of the load-reducingplunger 6 is greatly higher than that at the upper end, and due to the action of the diameter difference and the pressure difference, the hydraulic pressure generated by the hydraulic pressure on the lower end face of the load-reducingplunger 6 is greatly larger than that generated on the upper end face of the load-reducingplunger 6, so that the upper hydraulic pressure is generated at the lower part of the load-reducingplunger 6, the load of the hollow sucker rod 3 is reduced, and the load of the oil pumping unit is also reduced.

Claims (1)

1. A hydraulic load-reducing oil pumping device comprises an upper section oil pipe (1), a load-reducing pump barrel upper joint (2), a hollow sucker rod (3), a conversion joint (4), a load-reducing pump barrel (5), a load-reducing plunger (6), a communication joint (7), a load-reducing pump barrel lower joint (8), a sucker rod (9), a pump upper oil pipe (10), an upper pump barrel joint (11), an oil outlet joint (12), a pump barrel (13), a plunger (14), an oil outlet valve (15), a lower pump barrel joint (16) and an oil inlet valve (17), wherein the upper pump barrel joint (11), the pump barrel (13), the lower pump barrel joint (16) and the oil inlet valve (17) are sequentially connected, all joints are kept sealed, the oil inlet valve (17) is of a single-flow structure, well fluid can flow upwards from the lower direction of the oil inlet valve (17), the well fluid cannot flow downwards from the upper side of the oil inlet valve (17), and threads are arranged at the lower part of the oil inlet valve (17), the upper part of an upper pump barrel joint (11) is provided with an oil pipe internal thread, the lower part of a pump oil pipe (10) is connected with the upper part of the upper pump barrel joint (11), an oil outlet joint (12), a plunger (14) and an oil outlet valve (15) are sequentially connected, the joint of the lower part of the plunger (14) and the upper part of the oil outlet valve (15) keeps sealed, the oil outlet joint (12), the plunger (14) and the oil outlet valve (15) are placed in a pump barrel (13), the plunger (14) and the pump barrel (13) form a sealing pair, the oil outlet valve (15) is of a uniflow structure, well fluid can flow upwards from the lower part of the oil outlet valve (15), the well fluid can not flow downwards from the upper part of the oil outlet valve (15), an oil outlet groove (12-1) is arranged on the oil outlet joint (12), the well fluid in the plunger (14) can flow to the upper part of the plunger (14) through the oil outlet groove (12-1), and a sucker rod thread is arranged on the upper part, the sucker rod (9) passes its lower part of oil pipe (10) and the upper portion of going out oil joint (12) on the pump downwards and is connected characterized by: after an upper-section oil pipe (1), an upper deloading pump cylinder joint (2), a deloading pump cylinder (5) and a lower deloading pump cylinder joint (8) are sequentially connected, the lower part of the lower deloading pump cylinder joint (8) is connected with the upper part of an upper pump oil pipe (10), all joints are kept sealed, hollow sucker rod threads are arranged on the upper part of the adapter (4), a hollow sucker rod (3), an adapter (4), a deloading plunger (6) and a communication joint (7) are sequentially connected, the joints of the hollow sucker rod (3), the adapter (4) and the deloading plunger (6) are kept sealed, the lower part of the hollow sucker rod (3), the adapter (4), the deloading plunger (6) and the communication joint (7) are put into a pump cylinder (13), sucker rod threads are arranged on the lower part of the communication joint (7), the lower part of the communication joint (7) is connected with the upper part of a sucker rod (9), and the deloading plunger (6) and the deloading, the pump diameter of the deloading pump barrel (5) is larger than or equal to that of the pump barrel (13), the communicating joint (7) is provided with a communicating groove (7-1), well liquid in the pump oil feeding pipe (10) can enter the hollow sucker rod (3) through the communicating groove (7-1), the pump diameter of the deloading pump barrel (5) is larger than the outer diameter of the hollow sucker rod (3), and the connecting hole (2-1) is arranged on the deloading pump barrel upper joint (2).

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