CN118407912A

CN118407912A - Unidirectional blocking device, bidirectional liquid inlet auxiliary oil pumping device and method

Info

Publication number: CN118407912A
Application number: CN202410883005.7A
Authority: CN
Inventors: 梁爱国; 郭娟
Original assignee: Karamay Hongshan Oilfield Co ltd; Petrochina Co Ltd
Current assignee: Karamay Hongshan Oilfield Co ltd; Petrochina Co Ltd
Priority date: 2024-07-03
Filing date: 2024-07-03
Publication date: 2024-07-30

Abstract

The invention relates to the technical field of petroleum and natural gas, in particular to a unidirectional blocking device, a bidirectional liquid inlet auxiliary oil pumping device and a method. The invention has reasonable and compact structure, when in use, the upper end of the polish rod is connected with the pumping unit, the inner side of the lower part of the pipe body is provided with the fixed valve, the plunger is arranged between the valve seat and the fixed valve, the lower end of the polish rod is arranged together with the plunger, the inner side of the plunger is provided with the traveling valve, the traveling valve is closed when in upward stroke, the fixed valve is opened, and underground liquid flows into the pipe body above the fixed valve; during the downstroke, the fixed valve is closed, the traveling valve is opened, liquid between the plunger and the fixed valve flows into the pipe body above the traveling valve, and meanwhile, the valve core moves downwards and is in sealing contact with the inner side of the upper part of the valve seat, so that the liquid above the valve core can be prevented from flowing downwards along with the plunger, the unidirectional blocking effect is achieved, and the pump efficiency can be improved.

Description

Unidirectional blocking device, bidirectional liquid inlet auxiliary oil pumping device and method

Technical Field

The invention relates to the technical field of petroleum and natural gas, in particular to a unidirectional blocking device, a bidirectional liquid inlet auxiliary oil pumping device and a bidirectional liquid inlet auxiliary oil pumping method.

Background

The oil pump is a main device in a sucker rod pumping system, and the pumping of liquid in the oil well is carried out by the power transmitted by the oil pumping unit and the sucker rod. The oil pump is mainly composed of a working cylinder, a lining, a plunger and a traveling valve arranged on the plunger, and a fixed valve arranged at the lower end of the working cylinder. The fixed valve assembly comprises a fixed valve cover, a fixed valve ball, a fixed valve seat joint and the like, and the pumping of the oil pump is completed by the up-and-down reciprocating motion of the plunger assembly in the oil pipe. During the upstroke, the sucker rod drives the plunger to move upwards, the traveling valve is closed, the volume of the pump cavity is increased, the pressure is reduced, the fixed valve is opened, and underground liquid enters the pump cavity. During the downstroke, the sucker rod drives the plunger to move downwards, the fixed valve is closed, the volume of the pump cavity is reduced, the pressure is increased, the traveling valve is opened, and the oil in the pump cavity is discharged into an oil pipe on the pump. Thus, in the continuous up-and-down reciprocating motion of the plunger, the fixed valve and the traveling valve are also continuously and alternately closed and opened, and the liquid level in the oil pipe continuously rises until the wellhead is discharged into the oil outlet pipeline. In general, the liquid inlet of the oil pump is carried out in the process of the upper stroke of the plunger of the oil pump, the liquid column at the upper part of the plunger can reciprocate along with the plunger, and in the process of the descending of the plunger, the liquid inlet of the oil pump can not offset the descending of the liquid column on the plunger, and part of liquid in the pipe column can lift the liquid column only by the repeated acting of the plunger.

The Chinese patent literature with the publication number of CN109424529A discloses an oil pump, the name of which is a rod lifting whole-process liquid outlet oil pump, the oil pump comprises a small pump barrel, a large pump barrel, an upper outer pipe and a double-way joint which are sequentially connected from top to bottom, and also comprises an upper plunger and a lower power-assisted plunger which are sequentially connected from top to bottom, wherein the upper plunger comprises an upper small diameter section and a lower large diameter section, the upper small diameter section operates in the small pump barrel, the lower large diameter section operates in the large pump barrel, the upper outer pipe is provided with an axial central through hole and an eccentric through cavity, the lower power-assisted plunger operates in the central through hole of the upper outer pipe, the double-way joint is provided with an axial flow passage and a radial flow passage which are not communicated with each other, the lower end of the central through hole of the upper outer pipe is connected with the radial flow passage, the lower end of the eccentric through cavity of the upper outer pipe is connected with the axial flow passage, liquid above the plunger can flow back into a shaft when the liquid pressure in the well is lower, the pump efficiency is greatly reduced, the liquid pump efficiency can still exist in the process of lifting the oil liquid, the lower oil pipe can still move down in the process of lifting the oil pump, the liquid pump can be repeatedly used for acting on the liquid column when the plunger is lifted.

The Chinese patent literature with the publication number of CN210769263U and the name of pump cylinder inverted suspension up-down stroke liquid inlet and outlet oil pump discloses an oil pump, which comprises an outer tube assembly, a pump cylinder assembly and a plunger assembly, wherein the upper end and the lower end of the outer tube assembly are fixedly connected with an oil pipe; the pump cylinder of the pump cylinder assembly is fixedly connected with the outer pipe assembly; the upper end of the plunger assembly is fixedly connected with the sucker rod, and driven by the sucker rod to reciprocate up and down along the pump cylinder, the outer tube of the outer tube assembly, the bidirectional liquid inlet connector and the fixed valve I are sequentially and fixedly connected from top to bottom, and the bidirectional liquid inlet connector is provided with an axial liquid inlet channel and a radial liquid inlet channel; the pump cylinder assembly comprises an upper pump cylinder, a lower pump cylinder and a fixed valve II, and the upper pump cylinder, the lower pump cylinder and the fixed valve II are sequentially arranged from top to bottom; the upper pump cylinder is fixedly connected with the outer pipe assembly; the upper end and the lower end of the fixed valve II are respectively and fixedly connected with a lower pump cylinder and a bidirectional liquid inlet joint of the outer pipe assembly; the upper plunger, the mixed flow valve, the lower plunger and the traveling valve I of the plunger assembly are sequentially and fixedly connected from top to bottom; the mixing valve is provided with an axial flow channel and a radial flow channel. The pump cylinder is provided with a pump cylinder, a pump cylinder is arranged at the lower end of the pump cylinder, a liquid inlet and a liquid outlet are arranged at the upper end of the pump cylinder, a liquid outlet is arranged at the lower end of the pump cylinder, and a liquid inlet and a liquid outlet are arranged at the lower end of the pump cylinder. However, when the oil pump still has a downstroke in the process of lifting oil, the liquid column in the oil pipe descends, the descending liquid column can be lifted again only by repeated acting of the plunger, the power consumption of the oil pump is increased, and the resistance of the liquid is increased and the failure rate of the pump barrel assembly is increased by arranging the mixed flow valve in the pump barrel assembly.

Disclosure of Invention

The invention provides a unidirectional blocking device, a bidirectional liquid inlet auxiliary oil pumping device and a method, which overcome the defects of the prior art, and can effectively solve the problem of low pumping efficiency caused by the fact that liquid in the upper part of a pipe column moves downwards along with a polish rod in the existing oil pumping process.

One of the technical schemes of the invention is realized by the following measures: the utility model provides a one-way separation device, includes polished rod, case, spacing ring, spacing subassembly and hollow body, forms annular valve pocket after the outside protrusion of body middle part inner wall, is equipped with the polished rod in the valve pocket, is equipped with the spacing ring, case and the disk seat of suit outside the polished rod from top to bottom in the valve pocket, the case can with disk seat inner wall sealing contact after moving down, be equipped with the spacing subassembly that can spacing case reciprocating travel from top to bottom on the polished rod, the spacing ring includes ring body and elastomeric element, is equipped with elastomeric element in the ring body, elastomeric element middle part forms the centre bore, when the case does not receive spacing effort of spacing subassembly, elastomeric element can spacing case, when the case receives spacing effort of spacing subassembly, the inscribed circle diameter of centre bore changes and the case can follow inscribed circle diameter and pass.

The following are further optimizations and/or improvements to one of the above-described inventive solutions:

The elastic component can comprise at least three elastic bodies, the ring body is fixedly arranged on the inner wall of the upper part of the valve cavity, both ends of each elastic body are fixedly arranged on the inner wall of the ring body, and all elastic bodies form a central hole.

The limiting assembly can comprise a lower positioning ring and an upper positioning ring, wherein the lower positioning ring is fixed on the outer side of the polish rod corresponding to the position below the valve seat, and the upper positioning ring is fixed on the outer side of the polish rod corresponding to the position above the ring body.

The inner side of the lower part of the pipe body can be provided with a fixed valve, a plunger positioned in the pipe body is arranged between the valve seat and the fixed valve, the lower end of the polish rod passes through the valve seat and then is installed together with the plunger, and the inner side of the plunger is provided with a traveling valve.

The valve core outer wall can comprise a first spherical crown surface, a first cylindrical surface and a second spherical crown surface which are sequentially connected from top to bottom, the spherical diameters of the first spherical crown surface and the second spherical crown surface are both larger than the diameter of the first cylindrical surface, the valve seat inner wall comprises a first conical surface, a second cylindrical surface and a second conical surface which are sequentially connected from top to bottom, the first conical surface is in a shape of being large from top to bottom, and the second conical surface is in a shape of being large from top to bottom.

The ratio of the diameter of the second cylindrical surface to the diameter of the first cylindrical surface is 0.74-0.78, and the difference between the diameter of the second cylindrical surface and the diameter of the plunger is more than 4mm.

The distance between the ring body and the lower end of the valve cavity is 3/4 to 4/5 of the length of the valve cavity.

The difference between the inner diameter of the valve cavity and the inner diameter of the pipe body is 14-28 mm, and the length of the valve cavity is 4-6 times of the diameter of the first cylindrical surface.

The upper part and the lower part of the valve cavity can be smoothly transited with the corresponding positions of the inner wall of the pipe body.

The polish rod can comprise a weighting rod and a sliding polish rod which are sequentially and fixedly installed together from top to bottom, the plunger is fixedly installed below the sliding polish rod, the outer side of the upper end and the outer side of the lower end of the sliding polish rod are respectively provided with an upper centralizer and a lower centralizer, and the valve cavity is arranged on the inner side of the pipe body between the upper centralizer and the lower centralizer.

The second technical scheme of the invention is realized by the following measures: the utility model provides a supplementary oil pumping device of two-way feed liquor, includes one-way separation device and check valve, corresponds the body lower part outside of position between valve pocket below and the travelling valve top and is equipped with the check valve, the check valve is opened and can be so that the inside and outside intercommunication each other of body when the plunger moves down, the check valve can close and make the inside and outside intercommunication each other of body when the plunger moves up.

The following is a further optimization and/or improvement of the second technical scheme of the invention:

As one preferable mode, the one-way valve can comprise a first valve shell, a first valve plate, a second valve plate and a first valve ball, wherein the first valve shell is fixedly arranged on the outer side of a pipe body corresponding to the position between the lower part of the valve cavity and the upper part of the traveling valve in a sealing manner, a first liquid inlet communicated with the inside and the outside is arranged on the outer side of the lower part of the first valve shell, a first liquid outlet communicated with the first valve shell is arranged on the inner side of the pipe body corresponding to the position above the first liquid inlet, a first valve plate and a second valve plate are fixedly arranged on the inner side of the first valve shell corresponding to the position between the first liquid inlet and the first liquid outlet at intervals, a first liquid inlet channel penetrating up and down is arranged on the upper side of the second valve plate at intervals, and a first valve ball in sealing contact with the inner wall of the upper end of the first liquid inlet channel is arranged on the outer side of the lower part between the first valve plate and the second valve plate.

As another preferred aspect, the one-way valve may include a second valve casing, a third valve plate, a fourth valve plate and a second valve ball, where the second valve casing is fixedly installed on the outer side of the pipe body corresponding to the position between the lower part of the valve cavity and the upper part of the traveling valve in a sealing manner, a second liquid inlet communicated with the inside and the outside is provided on the outer side of the upper part of the second valve casing, a second liquid outlet communicated with the second valve casing is provided on the inner side of the pipe body corresponding to the position below the second liquid inlet, a third valve plate and a fourth valve plate are fixedly installed on the inner side of the second valve casing corresponding to the position between the second liquid inlet and the second liquid outlet in an upper-lower interval manner, a second liquid inlet channel penetrating up and down is provided on the upper side of the fourth valve plate in an interval manner, and a second valve ball in sealing contact with the inner wall of the lower end of the second liquid inlet channel after floating is installed between the first valve plate and the second valve plate.

The third technical scheme of the invention is realized by the following measures: a two-way liquid inlet auxiliary oil pumping method comprises the following steps:

The upper end of the weighting rod is connected with the oil pumping unit, the second spherical crown surface is in sealing contact with the first conical surface, the upper positioning ring is positioned above the valve cavity, the lower positioning ring is positioned below the valve cavity, and the one-way valve is closed so that the inside and the outside of the pipe body are not communicated with each other;

During the upward stroke, the pumping unit drives the weighting rod and the sliding polish rod to move upwards, so as to drive the plunger to move upwards, the traveling valve is closed, the fixed valve is opened, liquid in the shaft flows into the pipe body below the plunger through the fixed valve, the valve core moves upwards to enable the second spherical cap surface and the first conical surface to be separated from each other, and the one-way valve is still closed;

During the downward stroke, the pumping unit drives the weighting rod and the sliding polish rod to move downwards, so that the plunger is driven to move downwards, the fixed valve is closed, the traveling valve is opened, liquid between the plunger and the fixed valve flows into the pipe body above the traveling valve through the traveling valve, the one-way valve is opened to enable the inside and the outside of the pipe body above the plunger to be communicated with each other, liquid in the shaft flows into the pipe body between the upper side of the plunger and the lower side of the valve cavity through the one-way valve, and meanwhile, when the valve core moves downwards, the second spherical crown surface and the first conical surface are close to each other and then are in sealing contact;

after the sliding polished rod drives the plunger to reciprocate up and down, the underground liquid is pumped out of the shaft.

The invention has reasonable and compact structure, when in use, the upper end of the polish rod is connected with the pumping unit, the fixed valve is arranged at the inner side of the lower part of the pipe body, the plunger positioned in the pipe body is arranged between the valve seat and the fixed valve, the lower end of the polish rod passes through the valve seat and then is installed together with the plunger, the inner side of the plunger is provided with the traveling valve, the pumping unit drives the polish rod to move up and down, the polish rod drives the plunger to move up during the upward stroke, the traveling valve is closed, the liquid above the plunger flows up along with the plunger, the fixed valve is opened when the plunger moves up, and the underground liquid flows into the pipe body above the fixed valve through the fixed valve; during the downstroke, the fixed valve is closed, the polished rod drives the plunger to move downwards, when the plunger moves downwards, the traveling valve is opened, liquid between the plunger and the fixed valve flows into the pipe body above the traveling valve through the traveling valve, and meanwhile, the valve core moves downwards under the dead weight action of the polished rod above the valve core or/and the valve core and then is in sealing contact with the inner side of the upper part of the valve seat, so that the valve core plays a role in one-way separation, the liquid column above the plunger can be reduced to move downwards along with the plunger, and the liquid in the pit can be pumped out of the pit shaft after the polished rod drives the plunger to reciprocate up and down, so that the pump efficiency can be greatly improved, and the extraction efficiency of a lifting machine is improved.

Drawings

FIG. 1 is a schematic diagram of a cross-sectional front view of an embodiment of the present invention in use.

Fig. 2 is a schematic diagram of a front cross-sectional structure of two to nine embodiments of the present invention.

Fig. 3 is a schematic cross-sectional structure of valve cavities in the second to ninth embodiments of the present invention.

Fig. 4 is an enlarged schematic view of the structure at a in fig. 3.

Fig. 5 is a schematic diagram of a cross-sectional front view of a tenth embodiment of the present invention.

The codes in the drawings are respectively: 1 is a plunger, 2 is a traveling valve, 3 is a fixed valve, 4 is a pipe body, 5 is a valve cavity, 6 is a first spherical crown surface, 7 is a first cylindrical surface, 8 is a second spherical crown surface, 9 is a first conical surface, 10 is a second cylindrical surface, 11 is a second conical surface, 12 is a connecting polish rod, 13 is a weighting rod, 14 is a sliding polish rod, 15 is an oil pump pull rod, 16 is an upper centralizer, 17 is a lower centralizer, 18 is an upper locating ring, 19 is a lower locating ring, 20 is a ring body, 21 is a first valve shell, 22 is a first valve plate, 23 is a second valve plate, 24 is a first valve ball, 25 is a first liquid inlet, 26 is a first liquid outlet, 27 is a first liquid inlet, 28 is a first liquid outlet, 29 is a second valve shell, 30 is a third valve plate, 31 is a fourth valve plate, 32 is a second liquid inlet, 33 is a second liquid outlet, 34 is a second liquid inlet, 35 is a second liquid outlet, 36 is a second liquid outlet, and 37 is a tension spring.

Detailed Description

The present invention is not limited by the following examples, and specific embodiments can be determined according to the technical scheme and practical situations of the present invention.

In the present invention, for convenience of description, the description of the relative positional relationship of each component is described according to the layout manner of fig. 1 of the specification, for example: the positional relationship of front, rear, upper, lower, left, right, etc. is determined in accordance with the layout direction of fig. 1 of the specification.

The invention is further described below with reference to examples and figures:

Embodiment one: as shown in figure 1, the unidirectional blocking device comprises a polish rod, a valve core, a limiting ring, a limiting assembly and a hollow pipe body 4, wherein an annular valve cavity 5 is formed by outwards protruding the inner wall of the middle part of the pipe body 4, the polish rod is arranged in the valve cavity 5, the limiting ring, the valve core and a valve seat sleeved outside the polish rod are arranged in the valve cavity 5 from top to bottom at intervals, the valve core can be in sealing contact with the inner wall of the valve seat after moving downwards, the limiting assembly capable of limiting the up-and-down reciprocating stroke of the valve core is arranged on the polish rod, the limiting ring comprises a ring body 20 and an elastic part, the elastic part is arranged in the ring body 20, a central hole is formed in the middle of the elastic part, when the valve core is not subjected to the limiting acting force of the limiting assembly, the elastic part can limit the valve core, the inscribed circle diameter of the central hole changes and the valve core can pass through the central hole with the changing inscribed circle diameter.

According to the requirement, the section of the valve cavity 5 can be circular, the pipe body 4 can be an existing well-known oil pipe, the oil pipe comprises a plurality of connecting oil pipes which are sequentially and fixedly installed together from top to bottom, the valve cavity 5 is formed by outwards protruding the inner wall of one connecting oil pipe, the pipe body 4 can also comprise a valve shell which is provided with the valve cavity 5 and is of a tubular structure, and a plurality of connecting oil pipes are sequentially and fixedly installed at the lower end of the valve shell from bottom to top.

When the oil pumping machine is used, the upper end of the polish rod is connected with the oil pumping machine, the fixed valve is arranged on the inner side of the lower part of the pipe body 4, the plunger 1 positioned in the pipe body 4 is arranged between the valve seat and the fixed valve 3, the lower end of the polish rod passes through the valve seat and then is installed together with the plunger 1, the inner side of the plunger 1 is provided with the traveling valve 2, the oil pumping machine drives the polish rod to move up and down, the polish rod drives the plunger 1 to move up and the traveling valve 2 is closed, liquid above the plunger 1 flows up along with the plunger, when the plunger 1 moves up, the fixed valve 3 is opened, underground liquid flows into the pipe body 4 above the fixed valve 3 through the fixed valve 3, the valve core moves up under the action of the liquid below the valve core and the plunger 1, and the liquid below the valve core flows into the upper part of the valve seat under the action of the plunger 1; during the downstroke, the fixed valve 3 is closed, the polish rod drives the plunger 1 to move downwards, when the plunger 1 moves downwards, the traveling valve 2 is opened, liquid between the plunger 1 and the fixed valve 3 flows into the pipe body 4 above the traveling valve 2 through the traveling valve 2, and meanwhile, the valve core moves downwards under the dead weight action of the polish rod above the valve core or/and the valve core and then is in sealing contact with the inner side of the upper part of the valve seat, so that the liquid above the valve core can be prevented from flowing downwards along with the plunger 1, a unidirectional blocking effect is achieved, and the polish rod pumps the underground liquid out of a shaft after driving the plunger 1 to reciprocate up and down, so that the pump efficiency can be greatly improved, and the mining efficiency of a lifter is improved.

When the polish rod works, the valve core extrudes the elastic component when moving upwards under the action of the limiting component, the inscribed circle diameter of the central hole finally becomes larger, the valve core continuously moves upwards along with the polish rod after passing through the central hole, the elastic component resets after passing through the central hole, when the valve core is lowered into a shaft, the valve core moves to the upper end of the elastic component, the elastic component is extruded under the action of the limiting component on the polish rod, the central hole of the elastic component becomes larger, the valve core continuously moves downwards along with the polish rod after passing through the central hole, finally moves to the upper side of the valve seat, the elastic component resets after the valve core passes through the central hole, the valve core can carry out unidirectional blocking on liquid above the valve seat by the setting valve seat when the polish rod descends, and the elastic component can also limit the valve core when the polish rod ascends, so that the floating stroke of the valve core is prevented from being too high. During normal oil pumping, the elastic component can enable the valve core to slide within a limited range.

The unidirectional blocking device can be further optimized or/and improved according to actual needs:

Embodiment two: as an optimization of the above embodiment, as shown in fig. 2,3 and 4, the elastic component includes at least three elastic bodies, the ring body 20 is fixedly installed on the upper inner wall of the valve cavity 5, two ends of each elastic body are fixedly installed on the inner wall of the ring body 20, and all elastic bodies form a central hole.

The limiting assembly comprises a lower positioning ring 19 and an upper positioning ring 18, wherein the lower positioning ring 19 is fixed on the outer side of the polish rod corresponding to the position below the valve seat, and the upper positioning ring 18 is fixed on the outer side of the polish rod corresponding to the position above the ring body 20.

The inner side of the lower part of the pipe body 4 is provided with a fixed valve 3, a plunger 1 positioned in the pipe body 4 is arranged between the valve seat and the fixed valve 3, the lower end of the polish rod passes through the valve seat and then is installed together with the plunger 1, and the inner side of the plunger 1 is provided with a traveling valve 2.

According to the requirement, the elastic body can be the extension spring 37, the number of the extension spring 37 is four, the four extension springs 37 are intersected into a square in parallel two by two, the distance between the extension spring 37 and the lower end of the valve cavity 5 is 3/4 to 4/5 of the length of the valve cavity 5, so that the liquid below the valve seat can smoothly flow to the upper part of the valve seat after the valve seat is smoothly opened, the sections of the upper positioning ring 18 and the lower positioning ring 19 can be arc-shaped with inward openings or rectangular with smooth transition between the upper end and the lower end, and the elastic body can also be linear elastic materials with other elastic coefficients meeting the working condition requirement, such as silicon rubber, nylon and the like.

During the upward stroke, the polish rod drives the plunger 1 to move upwards, the traveling valve 2 is closed, liquid above the plunger 1 flows upwards along with the plunger 1, when the plunger 1 moves upwards, the fixed valve 3 is opened, underground liquid flows into the pipe body 4 above the fixed valve 3 through the fixed valve 3, a medium between the valve core and the plunger (when the liquid does not flow into the upper part of the plunger 1 or the liquid surface is positioned below the valve seat, the medium is air, when the liquid surface of the liquid flowing into the upper part of the plunger 1 is the same as the valve core in height), and the medium is liquid) pushes the valve core to move upwards when the plunger 1 moves upwards, and the valve core is separated from the valve seat; during the downward stroke, the fixed valve 3 is closed, the polish rod drives the plunger 1 to move downwards, the traveling valve 2 is opened when the plunger 1 moves downwards, and liquid between the plunger 1 and the fixed valve 3 flows into the pipe body 4 above the traveling valve 2 through the traveling valve 2; after the polish rod drives the plunger 1 to reciprocate up and down, the underground liquid is pumped out of the shaft.

When the polish rod works, the valve core extrudes the tension spring 37 when moving upwards under the action of the lower locating ring 19 and the polish rod, finally the tension spring 37 is propped up, the valve core moves upwards along with the polish rod after passing through the locating ring, the valve core returns to the tension spring 37 after passing through the tension spring 37, when the valve core is lowered into a shaft, the valve core moves to the upper end of the tension spring 37, the tension spring 37 is propped up under the action of the upper locating ring 18, the valve core moves downwards along with the polish rod after passing through the locating ring, finally moves to the upper side of the valve seat, the valve core returns to the tension spring 37 after passing through the tension spring 37, the polish rod drives the valve core to move up and down through the upper locating ring 18 and the lower locating ring 19 and passes through the tension spring 37, the valve core can seal the valve seat in a unidirectional blocking mode when the polish rod descends, the tension spring 37 can limit the valve core when the polish rod ascends, and the floating stroke of the valve core is prevented from being too high. During normal pumping, the extension spring 37 can stop the valve core to enable the valve core to slide in a limited range, so that the position of the plunger 1 in the shaft can be conveniently determined.

Embodiment III: as an optimization of the above embodiment, as shown in fig. 2 and 3, the outer wall of the valve core includes a first spherical crown surface 6, a first cylindrical surface 7 and a second spherical crown surface 8 which are sequentially connected from top to bottom, the spherical diameters of the first spherical crown surface 6 and the second spherical crown surface 8 are both larger than the diameter of the first cylindrical surface 7, the inner wall of the valve seat includes a first conical surface 9, a second cylindrical surface 10 and a second conical surface 11 which are sequentially connected from top to bottom, the first conical surface 9 is in a shape of being larger from top to bottom, and the second conical surface 11 is in a shape of being smaller from top to bottom.

According to the requirement, the spherical diameters of the first spherical crown surface 6 and the second spherical crown surface 8 are the same, the heights of the first spherical crown surface 6 and the second spherical crown surface 8 are smaller than the radius of the first spherical crown surface 8, and the difference between the spherical diameters of the first spherical crown surface 6 and the second spherical crown surface 8 and the diameter of the first cylindrical surface 7 is 4-8 mm. Therefore, the valve core moves downwards and is in sealing contact with the valve seat, and liquid above the valve core can be prevented from flowing downwards, so that the oil pumping efficiency can be improved.

Embodiment four: as an optimization of the above embodiment, as shown in fig. 2 and 3, the ratio of the diameter of the second cylindrical surface 10 to the diameter of the first cylindrical surface 7 is 0.74 to 0.78, and the difference between the diameter of the second cylindrical surface 10 and the diameter of the plunger 1 is greater than 4mm.

According to the demand, the diameter of the first cylindrical surface 7 is 8mm to 16mm with the diameter of the second cylindrical surface 10, and the diameter of the second cylindrical surface 10 is greater than 4mm with the diameter of the plunger 1, so that the plunger 1 can be ensured to pass smoothly when in lifting operation, the disassembly and assembly difficulty of the plunger 1 is reduced, the grinding width of the valve seat is 0.06 times of the diameter of the first cylindrical surface 7, and the outer side of the lower part of the valve core can be ensured to be in sealing contact with the inner side of the lower part of the valve seat.

Fifth embodiment: as an optimization of the above embodiment, as shown in fig. 2,3 and 4, the distance between the ring body 20 and the lower end of the valve cavity 5 is 3/4 to 4/5 of the length of the valve cavity 5.

When the sucker rod works, the lower end of the valve core is in contact with the upper end of the lower positioning ring 19, the lower positioning ring 19 drives the valve core to move upwards when moving upwards along with the polish rod, the valve core extrudes the extension spring 37 when moving upwards under the action of the polish rod, finally the extension spring 37 of the limiting ring is propped up, the valve core moves upwards along with the polish rod after passing through the limiting ring, the extension spring 37 returns after passing through the extension spring 37, when the valve core falls into a shaft, the valve core moves to the upper end of the extension spring 37, extrudes the extension spring 37 under the action of the positioning ring 18 on the polish rod, the extension spring 37 is propped up, the valve core moves downwards along with the polish rod after passing through the limiting ring, finally moves to the upper side of the valve seat, the extension spring 37 returns after passing through the extension spring 37, and during normal oil pumping, the extension spring 37 can stop the valve core to enable the valve core to slide in a limited range, and the distance between the ring body 20 and the lower end of the valve cavity 5 is 3/4 to 4/5 of the length of the valve cavity, so that liquid below the valve seat can be ensured to smoothly flow to above the valve seat after being opened.

Example six: as an optimization of the above embodiment, as shown in fig. 2, 3 and 4, the difference between the inner diameter of the valve cavity 5 and the inner diameter of the pipe body 4 is 14mm to 28mm, and the length of the valve cavity 5 is 4 to 6 times of the diameter of the first cylindrical surface 7; the upper part and the lower part of the valve cavity 5 are in smooth transition with the corresponding positions of the inner wall of the pipe body 4.

In the use process, the difference value between the inner diameter of the valve cavity 5 and the inner diameter of the pipe body 4 is 14mm to 28mm, so that after the valve core moves upwards, the liquid below the valve core can smoothly flow into the pipe body 4 above the valve cavity 5 through the valve cavity 5, and the resistance of the liquid and the load of the polish rod are reduced. According to the requirement, the upper part and the lower part of the valve cavity 5 are smoothly transited with the corresponding positions of the inner wall of the pipe body 4 through conical surfaces with the conical degrees of 60-80 degrees, and in the embodiment, the upper part and the lower part of the valve cavity 5 are smoothly transited with the corresponding positions of the inner wall of the pipe body 4 through conical surfaces with the conical degrees of 70 degrees.

Embodiment seven: as an optimization of the above embodiment, as shown in fig. 2, the polish rod comprises a weighting rod 13 and a sliding polish rod 14 which are fixedly installed together from top to bottom, the plunger 1 is fixedly installed below the sliding polish rod 14, an upper centralizer 16 and a lower centralizer 17 are respectively installed on the outer side of the upper end and the outer side of the lower end of the sliding polish rod 14, and the valve cavity 5 is arranged on the inner side of the pipe body 4 between the upper centralizer 16 and the lower centralizer 17.

According to the requirement, the upper end of the weighting rod 13 can be connected with the connecting polished rod 12, the lower end of the sliding polished rod 14 can be connected with the upper end of the oil pump pull rod 15, the plunger 1 is fixedly arranged at the lower end of the oil pump pull rod 15, the diameters of the sliding polished rod 14 and the oil pump pull rod 15 are the same, the surface roughness of the sliding polished rod 14 is smaller than that of the oil pump pull rod 15, the abrasion between the sliding polished rod 14 and the inner wall of a valve core can be reduced when the sliding polished rod 14 moves up and down, the length of the sliding polished rod 14 is equal to the sum of the pump stroke and 3 to 5 times of the anti-impact distance, and in order to ensure that the sliding polished rod 14 moves down smoothly, the weight of the weighting rod 13 is 80 to 120% of the weight of a liquid column under theoretical displacement. In the use process, through setting up the centralizer 16 and the centralizer 17 down, can guarantee when the slip polished rod 14 reciprocates that the case is coaxial with the disk seat, promote the case move down the back with the tightness between the disk seat.

Example eight: as an optimization of the above embodiment, as shown in fig. 2, the bidirectional liquid inlet auxiliary oil pumping device comprises a unidirectional blocking device and a unidirectional valve, wherein the unidirectional valve is arranged on the outer side of the lower portion of the pipe body 4 corresponding to the position between the lower portion of the valve cavity 5 and the upper portion of the traveling valve 2, the unidirectional valve is opened when the plunger 1 moves downwards and can enable the inside and the outside of the pipe body 4 to be communicated with each other, and the unidirectional valve can be closed when the plunger 1 moves upwards and can enable the inside and the outside of the pipe body 4 not to be communicated with each other.

When the plunger 1 moves upwards, the polish rod drives the plunger 1 to move upwards, the traveling valve 2 is closed, the pipe body 4 above the plunger 1 is not communicated with a shaft, liquid above the plunger 1 flows upwards along with the plunger 1, when the plunger 1 moves upwards, the volume of the pipe body 4 between the lower end of the plunger 1 and the fixed valve 3 is increased, the pressure is reduced, the fixed valve 3 is opened, and underground liquid flows into the pipe body 4 above the fixed valve 3 through the fixed valve 3; when the plunger 1 moves downwards, a pipe body 4 above the plunger 1 is communicated with a shaft, liquid in the shaft flows into the pipe body 4 above the plunger 1 through a one-way valve, meanwhile, the volume of the pipe body 4 between the lower end of the plunger 1 and the fixed valve 3 is reduced, the pressure is increased, the traveling valve 2 is opened, and liquid between the plunger 1 and the fixed valve 3 flows into the pipe body 4 above the traveling valve 2 through the traveling valve 2; after the polish rod drives the plunger 1 to reciprocate up and down, the underground liquid is pumped out of the shaft. Therefore, in the up-and-down stroke process of the plunger 1, the liquid in the shaft can flow unidirectionally into the pipe body 4, meanwhile, the valve core can play a unidirectional blocking role on the liquid above the valve core, so that the liquid above the valve core does not reciprocate along with the plunger 1 any more, and the displacement of the oil pump is greatly improved under the condition that the diameter of the pipe body 4 is unchanged.

The bidirectional liquid inlet auxiliary oil pumping device can be further optimized or/and improved according to actual needs:

example nine: as an optimization of the above embodiment, as shown in fig. 2, the check valve includes a first valve housing 21, a first valve plate 22, a second valve plate 23 and a first valve ball 24, the first valve housing 21 is fixedly installed on the outer side of the pipe body 4 corresponding to a position between the lower part of the valve cavity 5 and the upper part of the traveling valve 2 in a sealing manner, a first liquid inlet 25 communicated with the inside and the outside is provided on the outer side of the lower part of the first valve housing 21, a first liquid outlet 26 communicated with the first valve housing 21 is provided on the inner side of the pipe body 4 corresponding to a position above the first liquid inlet 25, the first valve plate 22 and the second valve plate 23 are fixedly installed on the inner side of the first valve housing 21 corresponding to a position between the first liquid inlet 25 and the first liquid outlet 26 in a vertically spaced manner, a first liquid inlet channel 27 communicated up and down is provided on the upper side of the second valve plate 23 in a spaced manner, at least one first liquid outlet channel 28 communicated up and down is provided on the upper side of the first valve plate 22 in a space between the first valve plate 23 and the first valve plate 23, and the first valve ball 24 is installed on the outer side of the upper end of the first liquid inlet channel 27 in a sealing manner.

The first valve ball 24 is a solid ball as desired. The distance between the first liquid outlet 26 and the fixed valve 3 is larger than one time of pump stroke and smaller than two times of pump stroke, the first liquid outlet 26 is positioned below the valve cavity 5 within 0.5m, so that liquid in the shaft space can enter the pipe body 4, and meanwhile the liquid in the pipe body 4 is prevented from flowing into the shaft space.

During the upward stroke, the polish rod drives the plunger 1 to move upwards, the traveling valve 2 is closed, the first valve ball 24 falls down to be in sealing contact with the first liquid inlet channel 27, then the one-way valve is closed, the pipe body 4 above the plunger 1 is not communicated with a shaft, liquid above the plunger 1 flows upwards along with the plunger 1, when the plunger 1 moves upwards, the volume of the pipe body 4 between the lower end of the plunger 1 and the fixed valve 3 is increased, the pressure is reduced, the fixed valve 3 is opened, and underground liquid flows into the pipe body 4 above the fixed valve 3 through the fixed valve 3; during the downward stroke, the fixed valve 3 is closed, the polish rod drives the plunger 1 to move downwards, when the plunger 1 moves downwards, the first valve ball 24 moves upwards under the action of the pressure of liquid in a shaft, and then opens the one-way valve, the pipe body 4 above the plunger 1 is communicated with the shaft, the liquid in the shaft flows into the pipe body 4 above the plunger 1 through the one-way valve, meanwhile, the volume of the pipe body 4 between the lower end of the plunger 1 and the fixed valve 3 is reduced, the pressure is increased, the traveling valve 2 is opened, and the liquid between the plunger 1 and the fixed valve 3 flows into the pipe body 4 above the traveling valve 2 through the traveling valve 2; after the polish rod drives the plunger 1 to reciprocate up and down, the underground liquid is pumped out of the shaft. Therefore, in the up-and-down stroke process of the plunger 1, the liquid in the shaft can flow unidirectionally into the pipe body 4, meanwhile, the valve core can play a unidirectional blocking role on the liquid above the valve core, so that the liquid above the valve core does not reciprocate along with the plunger 1 any more, and the displacement of the oil pump is greatly improved under the condition that the diameter of the pipe body 4 is unchanged.

Example ten: as an optimization of the eighth embodiment, the difference between the present embodiment and the ninth embodiment is only that the structure of the check valve is different, as shown in fig. 5, the check valve includes a second valve housing 29, a third valve plate 30, a fourth valve plate 31 and a second valve ball 36, the second valve housing 29 is fixedly installed on the outer side of the pipe body 4 corresponding to the position between the lower side of the valve cavity 5 and the upper side of the traveling valve 2, a second liquid inlet 32 communicating with the inside and the outside is provided on the outer side of the upper portion of the second valve housing 29, a second liquid outlet 33 communicating with the second valve housing 29 is provided on the inner side of the pipe body 4 corresponding to the position below the second liquid inlet 32, the third valve plate 30 and the fourth valve plate 31 are fixedly installed on the inner side of the second valve housing 29 corresponding to the position between the second liquid inlet 32 and the second liquid outlet 33 at an upper and lower interval, at least one second liquid outlet channel 35 communicating up and down is provided on the upper side of the third valve plate 30, and a second valve ball 34 contacting with the inner wall of the second liquid inlet channel 36 is installed on the upper side of the fourth valve plate 31 after the first valve plate 22 and the second valve plate 23.

The distance between the third valve plate 30 and the fourth valve plate 31 is greater than 1.5 times the diameter of the second valve ball 36, the diameter of the second valve ball 36 is 1.25 to 1.5 times that of the second liquid inlet passage 34, the density of the second valve ball 36 is less than 0.8g/cm, and the second valve ball 36 may be a hollow ball, as required.

During the upward stroke, the polish rod drives the plunger 1 to move upwards, the traveling valve 2 is closed, the second valve ball 36 floats and is in sealing contact with the second liquid inlet channel 34, the one-way valve is closed, the pipe body 4 above the plunger 1 is not communicated with a shaft, liquid above the plunger 1 flows upwards along with the plunger 1, when the plunger 1 moves upwards, the volume of the pipe body 4 between the lower end of the plunger 1 and the fixed valve 3 is increased, the pressure is reduced, the fixed valve 3 is opened, and underground liquid flows into the pipe body 4 above the fixed valve 3 through the fixed valve 3; during the downward stroke, the fixed valve 3 is closed, the polish rod drives the plunger 1 to move downwards, when the plunger 1 moves downwards, the second valve ball 36 moves downwards under the action of the pressure of liquid in a shaft and opens the one-way valve, the pipe body 4 above the plunger 1 is communicated with the shaft, the liquid in the shaft flows into the pipe body 4 above the plunger 1 through the one-way valve, meanwhile, the volume of the pipe body 4 between the lower end of the plunger 1 and the fixed valve 3 is reduced, the pressure is increased, the traveling valve 2 is opened, and the liquid between the plunger 1 and the fixed valve 3 flows into the pipe body 4 above the traveling valve 2 through the traveling valve 2; after the polish rod drives the plunger 1 to reciprocate up and down, the underground liquid is pumped out of the shaft. Therefore, in the up-and-down stroke process of the plunger 1, the liquid in the shaft can flow unidirectionally into the pipe body 4, meanwhile, the valve core can play a unidirectional blocking role on the liquid above the valve core, so that the liquid above the valve core does not reciprocate along with the plunger 1 any more, and the displacement of the oil pump is greatly improved under the condition that the diameter of the pipe body 4 is unchanged.

Example eleven: as shown in fig. 2 to 5, the bidirectional liquid inlet auxiliary oil pumping method comprises the following steps:

The upper end of a weighting rod 13 is connected with an oil pumping unit, a second spherical crown surface 8 is in sealing contact with a first conical surface 9, an upper positioning ring 18 is positioned above a valve cavity 5, a lower positioning ring 19 is positioned below the valve cavity 5, and a one-way valve is closed so that the inside and the outside of a pipe body 4 are not communicated with each other;

during the upward stroke, the pumping unit drives the weighting rod 13 and the sliding polished rod 14 to move upwards, so as to drive the plunger 1 to move upwards, the traveling valve 2 is closed, the fixed valve 3 is opened, liquid in the shaft flows into the pipe body 4 below the plunger 1 through the fixed valve 3, the valve core moves upwards to enable the second spherical cap surface 8 and the first conical surface 9 to be separated from each other, and the one-way valve is still closed;

During the downward stroke, the pumping unit drives the weighting rod 13 and the sliding polished rod 14 to move downwards, so as to drive the plunger 1 to move downwards, the fixed valve 3 is closed, the traveling valve 2 is opened, liquid between the plunger 1 and the fixed valve 3 flows into the pipe body 4 above the traveling valve 2 through the traveling valve 2, the one-way valve is opened to enable the inside and the outside of the pipe body 4 above the plunger 1 to be communicated with each other, liquid in a shaft flows into the pipe body 4 between the upper side of the plunger 1 and the lower side of the valve cavity 5 through the one-way valve, and meanwhile, when the valve core moves downwards, the second spherical cap surface 8 and the first conical surface 9 are close to each other and then are in sealing contact;

after the sliding polished rod 14 drives the plunger 1 to reciprocate up and down, the downhole fluid is pumped out of the wellbore.

According to the demand, the upper end of the weight rod 13 is connected with the pumping unit through a connecting polished rod 12. When the upward stroke is repeated again, the check valve is closed, the inside and the outside of the pipe body 4 between the upper part of the plunger 1 and the lower part of the valve cavity 5 are not communicated with each other, underground liquid flows into the pipe body 4 above the fixed valve 3 through the fixed valve 3, meanwhile, the medium between the valve core and the plunger (when the liquid does not flow into the upper part of the plunger 1 or the liquid level is positioned below the valve seat, the medium is air, when the liquid level of the liquid flowing into the upper part of the plunger 1 is the same as the valve core, the medium is liquid) pushes the valve core to move upwards when the plunger 1 moves upwards, the valve core is separated from the valve seat, the liquid below the valve core flows upwards through the valve cavity 5, the valve core moves to the extension spring 37 to be limited, then the sliding valve 14 moves downwards to start the downward stroke, the valve core moves downwards under the action of dead weight of the valve core or/and the valve core, thus the liquid in the pipe body 4 above the valve core plays a barrier function, the liquid in the pipe body 4 above the valve core does not flow downwards any more, meanwhile, the check valve is opened, the liquid in the pipe body 4 above the valve core is communicated with the inner part of the pipe body 4 and the valve cavity 1 is communicated with the outside when the inside and the valve cavity 4 is inside and the valve cavity 1 is in the outer part of the pipe body 4, the pipe body 4 is opened, the pressure is increased through the valve cavity 1 and the valve cavity 2 is fixed, the valve cavity 2 is opened, the pressure is increased, and the pressure between the valve body 1 and the valve body 2 is moved inside the pipe body 2 is moved down through the valve body and the valve body 2 is fixed through the valve body 3 and the valve body 3 is moved down through the valve 3.

Therefore, according to different oil well working conditions, in the process that the polish rod moves up and down, the valve core can separate the upper liquid column from descending when the plunger piston 1 descends, the pressure in the pipe body 4 on the upper portion of the plunger piston 1 is reduced, the inner and outer parts of the upper portion of the pipe body 4 are mutually communicated to feed liquid after the action of the one-way valve, the effective liquid feeding of the pipe body 4 can be realized in the process of the upward stroke and the downward stroke of the plunger piston 1, the reciprocating motion of the liquid column on the upper portion of the plunger piston 1 along with the descending of the plunger piston 1 is reduced, the pump efficiency is greatly improved, and the theoretical displacement of an oil pump is greatly improved under the condition that the diameter of the pipe body 4 is unchanged.

The technical characteristics form the embodiment of the invention, have stronger adaptability and implementation effect, and can increase or decrease unnecessary technical characteristics according to actual needs so as to meet the requirements of different situations.

Claims

1. The utility model provides a one-way separation device, its characterized in that includes polished rod, case, spacing ring, spacing subassembly and hollow body, forms annular valve pocket after the outside protrusion of body middle part inner wall, is equipped with the polished rod in the valve pocket, is equipped with spacing ring, case and the disk seat of suit in the polished rod outside from top to bottom in the valve pocket, the case can with disk seat inner wall sealing contact after moving down, be equipped with spacing subassembly that can spacing case reciprocating travel from top to bottom on the polished rod, the spacing ring includes ring body and elastomeric element, is equipped with elastomeric element in the ring body, elastomeric element middle part forms the centre bore, when the case does not receive spacing effort of spacing subassembly, elastomeric element can spacing case, when the case receives spacing effort of spacing subassembly, the inscribed circle diameter of centre bore changes and the case can be passed from the centre bore that inscribed circle diameter changed.

2. The unidirectional blocking device of claim 1, wherein the elastic member comprises at least three elastic bodies, the ring body is fixedly mounted on the inner wall of the upper portion of the valve cavity, both ends of each elastic body are fixedly mounted on the inner wall of the ring body, and all elastic bodies form the central hole; or/and the limiting assembly comprises a lower positioning ring and an upper positioning ring, wherein the lower positioning ring is fixed on the outer side of the polish rod corresponding to the position below the valve seat, and the upper positioning ring is fixed on the outer side of the polish rod corresponding to the position above the ring body; or/and, the inner side of the lower part of the pipe body is provided with a fixed valve, a plunger positioned in the pipe body is arranged between the valve seat and the fixed valve, the lower end of the polish rod passes through the valve seat and then is installed together with the plunger, and the inner side of the plunger is provided with a traveling valve.

3. The unidirectional blocking device according to claim 1 or 2, wherein the outer wall of the valve core comprises a first spherical crown surface, a first cylindrical surface and a second spherical crown surface which are sequentially connected from top to bottom, the spherical diameters of the first spherical crown surface and the second spherical crown surface are larger than the diameter of the first cylindrical surface, the inner wall of the valve seat comprises a first conical surface, a second cylindrical surface and a second conical surface which are sequentially connected from top to bottom, the first conical surface is in a shape of being large from top to bottom, and the second conical surface is in a shape of being large from top to bottom.

4. A one-way stop according to claim 3, wherein the ratio of the diameter of the second cylindrical surface to the diameter of the first cylindrical surface is 0.74 to 0.78, the difference between the diameter of the second cylindrical surface and the diameter of the plunger being greater than 4mm.

5. The unidirectional blocking device of claim 2 or 4, wherein the distance between the ring body and the lower end of the valve cavity is 3/4 to 4/5 of the length of the valve cavity; or/and the difference between the inner diameter of the valve cavity and the inner diameter of the pipe body is 14mm to 28mm, and the length of the valve cavity is 4 to 6 times of the diameter of the first cylindrical surface; or/and, smooth transition is carried out between the upper part and the lower part of the valve cavity and the corresponding positions of the inner wall of the pipe body; or/and the polish rod comprises a weighting rod and a sliding polish rod which are sequentially and fixedly installed together from top to bottom, the plunger is fixedly installed at the lower end of the sliding polish rod, an upper centralizer and a lower centralizer are respectively installed at the outer side of the upper end and the outer side of the lower end of the sliding polish rod, and the valve cavity is arranged at the inner side of the pipe body between the upper centralizer and the lower centralizer.

6. A one-way blocking device according to claim 3, characterized in that the distance between the ring body and the lower end of the valve chamber is 3/4 to 4/5 of the length of the valve chamber; or/and the difference between the inner diameter of the valve cavity and the inner diameter of the pipe body is 14mm to 28mm, and the length of the valve cavity is 4 to 6 times of the diameter of the first cylindrical surface; or/and, smooth transition is carried out between the upper part and the lower part of the valve cavity and the corresponding positions of the inner wall of the pipe body; or/and the polish rod comprises a weighting rod and a sliding polish rod which are sequentially and fixedly installed together from top to bottom, the plunger is fixedly installed below the sliding polish rod, an upper centralizer and a lower centralizer are respectively installed on the outer side of the upper end and the outer side of the lower end of the sliding polish rod, and the valve cavity is arranged on the inner side of the pipe body between the upper centralizer and the lower centralizer.

7. A bidirectional liquid feeding auxiliary oil pumping device of a unidirectional blocking device according to any one of claims 1 to 6, characterized by comprising the unidirectional blocking device and a unidirectional valve, wherein the unidirectional valve is arranged on the outer side of the lower part of the pipe body corresponding to the position between the lower part of the valve cavity and the upper part of the traveling valve, the unidirectional valve is opened when the plunger moves downwards and can enable the inside and the outside of the pipe body to be mutually communicated, and the unidirectional valve can be closed when the plunger moves upwards and can enable the inside and the outside of the pipe body not to be mutually communicated.

8. The bidirectional liquid inlet auxiliary oil pumping device according to claim 7, wherein the one-way valve comprises a first valve shell, a first valve plate, a second valve plate and a first valve ball, the first valve shell is fixedly installed on the outer side of the pipe body corresponding to the position between the lower part of the valve cavity and the upper part of the traveling valve in a sealing manner, a first liquid inlet communicated with the inside and the outside is arranged on the outer side of the lower part of the first valve shell, a first liquid outlet communicated with the first valve shell is arranged on the inner side of the pipe body corresponding to the position above the first liquid inlet, a first valve plate and a second valve plate are fixedly installed on the inner side of the first valve shell corresponding to the position between the first liquid inlet and the first liquid outlet at intervals, a first liquid inlet channel penetrating up and down is arranged on the upper side of the second valve plate, and a first valve ball with the outer side of the lower part in sealing contact with the inner wall of the upper end of the first liquid inlet channel is installed on the upper side of the first valve plate at intervals.

9. The bidirectional liquid inlet auxiliary oil pumping device according to claim 7, wherein the one-way valve comprises a second valve shell, a third valve plate, a fourth valve plate and a second valve ball, the second valve shell is fixedly arranged on the outer side of the pipe body corresponding to the position between the lower part of the valve cavity and the upper part of the traveling valve in a sealing manner, a second liquid inlet communicated with the inside and the outside is arranged on the outer side of the upper part of the second valve shell, a second liquid outlet communicated with the second valve shell is arranged on the inner side of the pipe body corresponding to the position below the second liquid inlet, a third valve plate and a fourth valve plate are fixedly arranged on the inner side of the second valve shell corresponding to the position between the second liquid inlet and the second liquid outlet in an upper-lower interval manner, a second liquid inlet channel communicated from top to bottom is arranged on the upper side of the third valve plate in an interval manner, and the second valve ball in sealing contact with the inner wall of the lower end of the second liquid inlet channel is arranged on the upper side of the first valve plate and the second valve plate after floating.

10. A bi-directional fluid intake assisted oil pumping method of a bi-directional fluid intake assisted oil pumping apparatus according to any one of claims 7 to 9, comprising the steps of: