CN114856491B - Sliding double-ball pump bottom valve - Google Patents
Sliding double-ball pump bottom valve Download PDFInfo
- Publication number
- CN114856491B CN114856491B CN202110156000.0A CN202110156000A CN114856491B CN 114856491 B CN114856491 B CN 114856491B CN 202110156000 A CN202110156000 A CN 202110156000A CN 114856491 B CN114856491 B CN 114856491B
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- ball seat
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- sealing
- ball
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- 238000007789 sealing Methods 0.000 claims abstract description 125
- 239000007788 liquid Substances 0.000 claims abstract description 24
- 230000000149 penetrating effect Effects 0.000 claims abstract description 3
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 238000000605 extraction Methods 0.000 abstract description 2
- 230000007306 turnover Effects 0.000 abstract 1
- 239000012530 fluid Substances 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 10
- 238000005086 pumping Methods 0.000 description 3
- 230000001960 triggered effect Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 238000011001 backwashing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/10—Valves; Arrangement of valves
- F04B53/1002—Ball valves
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
The present disclosure provides a sliding double-ball pump bottom valve, which belongs to the technical field of oil extraction technology. The sliding double-ball pump bottom valve comprises a cylinder body, a first annular ball seat, a first sealing ball, a columnar piston, a second annular ball seat, a second sealing ball and a supporting rod; the first annular ball seat, the second annular ball seat and the columnar piston are coaxially arranged in the cylinder; the cylinder body is provided with a liquid inlet and outlet channel penetrating through the side wall of the cylinder body; the cylindrical piston has a flow passage extending axially thereof; the columnar piston is connected with the side wall of the cylinder body through a shear pin. Through the pressure in the increase barrel, make the shear pin cut off, the columnar piston moves down, makes business turn over liquid passageway and overflow passageway intercommunication, takes out from first annular ball seat and second annular ball seat with the bracing piece that columnar piston links to each other, makes first sealing ball and second sealing ball block up first annular ball seat and second annular ball seat respectively, need not throw the ball, has avoided the condition of sealing ball card in the well, has improved the reliability of two ball pump bottom valves of slidingtype.
Description
Technical Field
The disclosure relates to the technical field of oil extraction processes, and in particular relates to a sliding double-ball pump bottom valve.
Background
A pump bottom valve is typically provided below the suspended pump of the rod-pumped well so that during oil production, fluid in the well can only flow downhole to the wellhead, but before oil production begins, it is also necessary to allow wellhead pressure to act below the pump bottom valve.
The core structure of the bottom valve generally includes a sealing ball and a bottom valve body having an annular ball seat therein, the bottom valve body being mounted below the suspended pump and being driven into the well with the suspended pump, the sealing ball being required to be separated from the bottom valve body in order for the pressure at the wellhead to be transferred below the bottom valve through the bottom valve before the start of oil recovery. The wellhead is pressurized to set the downhole packer or trigger other downhole tools, and then the sealing ball is thrown into the well from the wellhead, so that the sealing ball falls into the annular ball seat in the pump bottom valve body. The diameter of the sealing ball is larger than the inner diameter of the annular ball seat, the annular ball seat is blocked by the sealing ball, so that when the oil pump is in a downward stroke, fluid on the upper portion of the pump bottom valve cannot flow to the lower portion of the pump bottom valve, the pressure of a wellhead cannot be continuously acted below the pump bottom valve, but when the pressure below the pump bottom valve is larger than the pressure above the pump bottom valve, the sealing ball is separated from the annular ball seat, and the fluid at the bottom of the well can flow to the wellhead through the pump bottom valve.
Such a pump bottom valve in the related art may be caught in a well before a sealing ball reaches an annular ball seat during a ball injection process, resulting in insufficient reliability of the pump bottom valve, thereby affecting the production work of an oil well.
Disclosure of Invention
The embodiment of the disclosure provides a sliding double-ball pump bottom valve, which can prevent a sealing ball from being clamped in a well and improve the reliability of the pump bottom valve. The technical scheme is as follows:
the embodiment of the disclosure provides a sliding double-ball pump bottom valve, which comprises a cylinder body, a first annular ball seat, a first sealing ball, a columnar piston, a second annular ball seat, a second sealing ball and a supporting rod;
the first annular ball seat is coaxially positioned in the cylinder body, and the peripheral wall of the first annular ball seat is attached to the inner wall of the cylinder body;
the inner wall of the cylinder is provided with an inner flange, the cylinder is provided with a liquid inlet and outlet channel penetrating through the side wall of the cylinder, and the liquid inlet and outlet channel is positioned between the inner flange and the first annular ball seat;
the columnar piston is provided with a flow passage extending along the axial direction of the columnar piston, and the flow passage is communicated with two end surfaces of the columnar piston;
the cylindrical piston is coaxially positioned in the cylinder body, an outer flange is arranged at one end of the cylindrical piston, which is close to the first annular ball seat, the outer flange is positioned between the first annular ball seat and the liquid inlet and outlet channel, a gap is arranged between the outer flange and the first annular ball seat, and the axial width of the outer flange is smaller than the maximum distance from the overflow channel to the side surface of the inner flange, which is close to the outer flange;
the outer flange is in sliding sealing fit with the inner wall of the cylinder body, and one end of the columnar piston, which is far away from the first annular ball seat, is in sliding sealing fit with the inner wall of the inner flange;
the columnar piston is connected with the side wall of the cylinder body through a shear pin;
the second annular ball seat is coaxially positioned in the cylinder body and is positioned at one side of the first annular ball seat away from the columnar piston;
the support rod is connected with the end face of the columnar piston, which is close to one end of the columnar piston, and penetrates through the first annular ball seat and the second annular ball seat, gaps are reserved between the support rod and the inner wall of the first annular ball seat and between the support rod and the inner wall of the second annular ball seat, and the distance between the end face of the support rod, which is far away from one end of the columnar piston, and the end face of the first annular ball seat, which is close to one end of the columnar piston, is smaller than the distance between the outer flange and the inner flange;
the first sealing ball is located between the first annular ball seat and the second annular ball seat, the diameter of the first sealing ball is larger than the inner diameter of the first annular ball seat, the second sealing ball is located on one side, away from the first annular ball seat, of the second annular ball seat, and the diameter of the second sealing ball is larger than the inner diameter of the second annular ball seat.
Optionally, the cylinder comprises an outer sleeve and a fixed sleeve;
the side wall of the outer sleeve is provided with a first through hole;
the side wall of the fixed sleeve is provided with a second through hole, the fixed sleeve, the first annular ball seat and the second annular ball seat are coaxially positioned in the outer sleeve, and the second through hole is communicated with the first through hole to form the liquid inlet and outlet channel;
the inner flange is positioned in one end of the fixed sleeve away from the first annular ball seat;
the columnar piston is positioned in the fixed sleeve.
Optionally, the shear pins are inserted in the side walls of the retaining sleeve and the peripheral wall of the outer flange.
Optionally, the inner wall of the outer sleeve is provided with a limiting spigot, and one end of the second annular ball seat, which is far away from the first annular ball seat, is propped against the limiting spigot;
the barrel body further comprises an inner sleeve, wherein the inner sleeve is coaxially positioned in the outer sleeve and positioned between the first annular ball seat and the second annular ball seat, and two ends of the inner sleeve are respectively propped against the first annular ball seat and the second annular ball seat;
the fixed sleeve is abutted against the first annular ball seat.
Optionally, the sliding double-ball pump bottom valve further comprises a first sealing ball baffle and a second sealing ball baffle, wherein the first sealing ball baffle and the second sealing ball baffle are provided with a plurality of third through holes;
the first sealing ball baffle is coaxially positioned at the end part of the second annular ball seat, which is close to one end of the first annular ball seat, and the supporting rod penetrates through a third through hole of the first sealing ball baffle;
the second sealing ball baffle is coaxially located at the end of one end of the outer sleeve, and the second sealing ball is located between the second annular ball seat and the second sealing ball baffle.
Optionally, the barrel further includes an upper joint and a lower joint, the upper joint and the lower joint are respectively coaxially connected to two ends of the outer sleeve, and the lower joint is located at one end of the fixing sleeve away from the first annular ball seat.
Optionally, an end of the lower joint abuts an end of the fixing sleeve.
Optionally, the inner hole of the first annular ball seat and the inner hole of the second annular ball seat are conical surfaces.
Optionally, sealing rings are arranged between the outer flange and the inner wall of the cylinder body, and between the columnar piston and the inner flange.
Optionally, the support rod is coaxially connected with the columnar piston, the columnar piston is provided with a plurality of through-flow channels, and the through-flow channels are arranged at equal angular intervals along the circumference of the columnar piston.
The technical scheme provided by the embodiment of the disclosure has the beneficial effects that at least:
after the sliding type double-ball pump bottom valve enters a well, as the supporting rod penetrates through the first annular ball seat and the second annular ball seat, the second sealing ball is separated from the second annular ball seat, the first sealing ball is separated from the first annular ball seat, at the moment, the pressure of a wellhead can be transmitted to the lower part of the sliding type double-ball pump bottom valve through the sliding type double-ball pump bottom valve, so that the wellhead is conveniently pressurized to enable the downhole packer to be set, or other downhole tools to be triggered to work and the like. Because the columnar piston is positioned below the first annular ball seat, one end of the columnar piston, which is close to the first annular ball seat, is provided with an outer flange which is in sliding sealing fit with the inner wall of the cylinder body, and the other end of the columnar piston is in sliding sealing fit with the inner flange of the inner wall of the cylinder body, the end surface area of one end of the columnar piston, which is close to the first annular ball seat, is larger than the end surface area of the other end, and the two end surfaces of the columnar piston are communicated through the flow passage, so that the pressure acting on the end surface of the columnar piston, which is close to one end of the first annular ball seat, is larger than the pressure acting on the end surface of the other end of the columnar piston, namely the whole acting force of fluid in the cylinder body on the columnar piston is downward. The liquid inlet and outlet channel is communicated with a first annular space between the inner wall of the cylinder body and the columnar piston and a second annular space between the cylinder body and the well wall, the pressure of the first annular space acts on the outer flange, the acting force generated by the columnar piston is upward, when the difference value between the downward acting force and the upward acting force borne by the columnar piston reaches a certain value by increasing the pressure in the cylinder body, the shear pin is sheared by the columnar piston, the columnar piston moves downwards, the liquid inlet and outlet channel is communicated with the flow channel, the support rod connected with the columnar piston is pulled away from the second annular ball seat and the first annular ball seat, the second sealing ball falls into the second annular ball seat to plug the second annular ball seat, and the first sealing ball falls into the first annular ball seat to plug the first annular ball seat. The sealing ball does not need to be thrown into the well, the condition that the sealing ball is clamped in the well is avoided, and the reliability of the pump bottom valve is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
Fig. 1 is a schematic structural diagram of a sliding double-ball pump bottom valve according to an embodiment of the present disclosure.
Detailed Description
For the purposes of clarity, technical solutions and advantages of the present disclosure, the following further details the embodiments of the present disclosure with reference to the accompanying drawings.
Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," "third," and the like in the description and in the claims, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, is intended to mean that elements or items that are present in front of "comprising" or "comprising" are included in the word "comprising" or "comprising", and equivalents thereof, without excluding other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to denote relative positional relationships, which may also change accordingly when the absolute position of the object to be described changes.
Fig. 1 is a schematic structural diagram of a sliding double-ball pump bottom valve according to an embodiment of the present disclosure. As shown in fig. 1, the sliding type double ball pump bottom valve includes a cylinder 10, a first annular ball seat 21, a first sealing ball 31, a cylindrical piston 40, a second annular ball seat 22, a second sealing ball 32, and a support rod 50.
The first annular ball seat 21 is coaxially arranged in the cylinder 10, and the outer peripheral wall of the first annular ball seat 21 is attached to the inner wall of the cylinder 10.
The inner wall of the barrel 10 has an inner flange 121, and the barrel 10 has an access passage 10a extending through the side wall of the barrel 10, the access passage 10a being located between the inner flange 121 and the first annular ball seat 21.
The columnar piston 40 has a flow passage 40a extending in the axial direction thereof, and the flow passage 40a communicates with both end surfaces of the columnar piston 40. The cylindrical piston 40 is coaxially arranged in the cylinder 10, one end of the cylindrical piston 40, which is close to the first annular ball seat 21, is provided with an outer flange 41, and the outer flange 41 is arranged between the first annular ball seat 21 and the liquid inlet and outlet passage 10a and is provided with a gap with the first annular ball seat 21. The axial width of the outer flange 41 is less than the maximum distance from the through-flow passage 40a to the inner flange 121 near one side of the outer flange 41. The outer flange 41 is in sliding sealing engagement with the inner wall of the barrel 10 and the end of the cylindrical piston 40 remote from the first annular ball seat 21 is in sliding sealing engagement with the inner wall of the inner flange 121. The cylindrical piston 40 is connected to the side wall of the cylinder 10 by a shear pin 60.
The second annular ball seat 22 is coaxially located within the barrel 10 and on the side of the first annular ball seat 21 remote from the cylindrical piston 40.
The supporting rod 50 is connected with the end face of the columnar piston 40, which is close to one end of the first annular ball seat 21, the supporting rod 50 penetrates through the first annular ball seat 21 and the second annular ball seat 22, and gaps are reserved between the supporting rod 50 and the inner walls of the first annular ball seat 21 and the second annular ball seat 22. So that hydraulic force can be applied to the entire end surface of the cylindrical piston 40 near the end of the first annular ball seat 21.
The distance D between the end surface of the support rod 50 at the end far from the cylindrical piston 40 and the end surface of the first annular ball seat 21 at the end near the cylindrical piston 40 is smaller than the distance D between the outer flange 41 and the inner flange 121. The plunger 40 is moved downwardly a distance not exceeding the distance D between the outer flange 41 and the inner flange 121, which is smaller than the distance D, ensuring that the support rod 50 can be withdrawn from the first annular ball seat 21.
The first sealing ball 31 is located between the first annular ball seat 21 and the second annular ball seat 22, the diameter of the first sealing ball 31 is larger than the inner diameter of the first annular ball seat 21, the second sealing ball 32 is located on the side, away from the first annular ball seat 21, of the second annular ball seat 22, and the diameter of the second sealing ball 32 is larger than the inner diameter of the second annular ball seat 22.
After the sliding type double-ball pump bottom valve enters a well, as the supporting rod penetrates through the first annular ball seat and the second annular ball seat, the second sealing ball is separated from the second annular ball seat, the first sealing ball is separated from the first annular ball seat, at the moment, the pressure of a wellhead can be transmitted to the lower part of the sliding type double-ball pump bottom valve through the sliding type double-ball pump bottom valve, so that the wellhead is conveniently pressurized to enable the downhole packer to be set, or other downhole tools to be triggered to work and the like. Because the columnar piston is positioned below the first annular ball seat, one end of the columnar piston, which is close to the first annular ball seat, is provided with an outer flange which is in sliding sealing fit with the inner wall of the cylinder body, and the other end of the columnar piston is in sliding sealing fit with the inner flange of the inner wall of the cylinder body, the end surface area of one end of the columnar piston, which is close to the first annular ball seat, is larger than the end surface area of the other end, and the two end surfaces of the columnar piston are communicated through the flow passage, so that the pressure acting on the end surface of the columnar piston, which is close to one end of the first annular ball seat, is larger than the pressure acting on the end surface of the other end of the columnar piston, namely the whole acting force of fluid in the cylinder body on the columnar piston is downward. The liquid inlet and outlet channel is communicated with a first annular space between the inner wall of the cylinder body and the columnar piston and a second annular space between the cylinder body and the well wall, the pressure of the first annular space acts on the outer flange, the acting force generated by the columnar piston is upward, when the difference value between the downward acting force and the upward acting force borne by the columnar piston reaches a certain value by increasing the pressure in the cylinder body, the shear pin is sheared by the columnar piston, the columnar piston moves downwards, the liquid inlet and outlet channel is communicated with the flow channel, the support rod connected with the columnar piston is pulled away from the second annular ball seat and the first annular ball seat, the second sealing ball falls into the second annular ball seat to plug the second annular ball seat, and the first sealing ball falls into the first annular ball seat to plug the first annular ball seat. The sealing ball does not need to be thrown into the well, the condition that the sealing ball is clamped in the well is avoided, and the reliability of the pump bottom valve is improved. By arranging two sealing balls for sealing, the sealing performance of the bottom valve of the sliding type double-ball pump is further improved, and leakage of the bottom valve of the sliding type double-ball pump is avoided.
In addition, after the columnar piston 40 is pushed away, the backwashing function can be completed through the liquid inlet and outlet passage 10a, so that the production efficiency is improved, and the construction operation cost is reduced.
As shown in fig. 1, sealing rings 81 are provided between the outer flange 41 of the columnar piston 40 and the inner wall of the cylinder 10, and between the columnar piston 40 and the inner flange 121 of the cylinder 10.
By providing the seal ring 81, the sealing performance is improved, and the shear pin 60 is prevented from being sheared due to leakage between the columnar piston 40 and the cylinder 10.
In addition, when the seal rings 81 are provided, at least two seal rings 81 may be provided at intervals to improve the sealing effect.
Illustratively, the seal 81 is an O-ring seal.
Alternatively, the support rod 50 is coaxially connected to the cylindrical piston 40, and the cylindrical piston 40 has a plurality of through-flow passages 40a, the plurality of through-flow passages 40a being arranged at equal angular intervals along the circumferential direction of the cylindrical piston 40.
In this way, the pressure distribution received by the end face of the columnar piston 40 close to the first annular ball seat 21 is more balanced, and the possibility of the columnar piston 40 being jammed is reduced.
Illustratively, the plunger 40 has 3 flow passages 40a.
As shown in fig. 1, the inner bore of the first annular ball seat 21 and the inner bore of the second annular ball seat 22 are tapered, so that the first sealing ball 31 and the second sealing ball 32 can seal the inner bore of the first annular ball seat 21 and the second annular ball seat 22 more tightly.
As shown in fig. 1, the cartridge 10 includes an outer sleeve 11 and a fixed sleeve 12. The side wall of the outer sleeve 11 has a first through hole 11a. The side wall of the fixed sleeve 12 is provided with a second through hole 12a, and the fixed sleeve 12, the first annular ball seat 21 and the second annular ball seat 22 are coaxially arranged in the outer sleeve 11. The second through hole 12a communicates with the first through hole 11a to form a liquid inlet/outlet passage 10a. An inner flange 121 is located in the end of the retaining sleeve 12 remote from the first annular ball seat 21. A cylindrical piston 40 is located in the stationary sleeve 12.
When the sliding double-ball pump bottom valve is assembled, the columnar piston 40 and the fixed sleeve 12 can be assembled together, connected through the shear pin 60 and then integrally installed in the outer sleeve 11, so that the assembly of the sliding double-ball pump bottom valve is facilitated. In addition, in order to avoid leakage, a good seal is provided between the cylindrical piston 40 and the stationary sleeve 12.
As shown in fig. 1, the cartridge 10 further includes an upper joint 14 and a lower joint 15. The upper joint 14 and the lower joint 15 are coaxially connected to both ends of the outer sleeve 11, respectively, and the lower joint 15 is located at an end of the fixing sleeve 12 remote from the first annular ball seat 21.
The upper sub 14 is used to connect the sliding double ball pump bottom valve to the suspension pump and the lower sub 15 is used to connect a downhole tool, such as a packer, an anchor tool, etc., located below the sliding double ball pump bottom valve.
Optionally, sealing rings 81 are provided between the upper and lower joints 14 and 15 and the cylinder 10 to improve sealability and avoid leakage.
Optionally, the upper joint 14 and the lower joint 15 are both screwed with the cylinder 10. The upper end of the upper sub 14 is also internally threaded to facilitate connection of the suspended pump and the lower end of the lower sub 15 is also externally threaded to facilitate connection of a downhole tool.
As shown in fig. 1, shear pins 60 are inserted in the side walls of the stationary sleeve 12 and the outer peripheral wall of the outer flange 41 of the plunger 40.
The side wall of the fixing sleeve 12 and the outer flange 41 of the cylindrical piston 40 are provided with shear pin holes 60a, and after the cylindrical piston 40 is inserted into the fixing sleeve 12, the shear pin holes 60a on the fixing sleeve 12 and the outer flange 41 are aligned, and the shear pin 60 is inserted into the shear pin holes 60a from the outside of the fixing sleeve 12.
Optionally, a plurality of shear pins 60 are connected between the fixing sleeve 12 and the columnar piston 40, and the plurality of shear pins 60 are distributed at equal angular intervals along the circumference of the columnar piston 40. By providing a plurality of shear pins 60, the outer flange 41 is more balanced against jamming in the mounting sleeve 12.
Illustratively, 3 shear pins 60 are connected between the stationary sleeve 12 and the plunger 40. The 3 shear pins 60 are spaced 120 apart.
The strength of the shear pin 60 is set according to the specific construction requirements. For example, depending on the setting pressure of the packer connected in the production string below the sliding double ball pump bottom valve, the shear pin 60 is at least not so strong as to shear before the pressure in the barrel 10 reaches the setting pressure of the packer, so as to avoid movement of the plunger 40 before triggering the downhole tool, causing the sliding double ball pump bottom valve to close, i.e. the first sealing ball 31 to drop into the first annular ball seat 21 and the second sealing ball 32 to drop into the second annular ball seat 22.
As shown in fig. 1, the inner wall of the outer sleeve 11 has a limit stop 111, and an end of the second annular ball seat 22 remote from the first annular ball seat 21 abuts against the limit stop 111.
The barrel 10 further comprises an inner sleeve 13, wherein the inner sleeve 13 is coaxially arranged in the outer sleeve 11 and is arranged between the first annular ball seat 21 and the second annular ball seat 22, and two ends of the inner sleeve 13 respectively abut against the first annular ball seat 21 and the second annular ball seat 22. The fixed sleeve 12 abuts against the first annular ball seat 21.
When the sliding type double-ball pump bottom valve is assembled, the second annular ball seat 22, the inner sleeve 13, the first sealing ball 31, the first annular ball seat 21 and the fixing sleeve 12 are sequentially put in from one end of the outer sleeve 11, so that the first annular ball seat 21 and the second annular ball seat 22 are axially limited in the outer sleeve 11 through the limiting spigot 111, the fixing sleeve 12 and the inner sleeve 13.
Optionally, sealing rings 81 are provided between the first annular ball seat 21 and the outer sleeve 11, and between the second annular ball seat 22 and the outer sleeve 11, so as to improve the sealing performance and avoid pressure leakage.
As shown in fig. 1, the end of the lower joint 15 abuts against the end of the fixed sleeve 12.
The upper end of the lower joint 15 is inserted into the fixed sleeve 12, the upper end of the lower joint 15 is used for propping against the end part of the fixed sleeve 12 to axially limit the fixed sleeve 12, and thus the second annular ball seat 22, the inner sleeve 13, the first annular ball seat 21 and the fixed sleeve 12 are axially limited.
As shown in fig. 1, the sliding double ball pump bottom valve further includes a first sealing ball shutter 71 and a second sealing ball shutter 72, each of the first sealing ball shutter 71 and the second sealing ball shutter 72 having a plurality of third through holes 70a.
The first sealing ball baffle 71 is coaxially positioned at the end of the second annular ball seat 22 adjacent to the end of the first annular ball seat 21 and the support rod 50 passes through a third through hole 70a of the first sealing ball baffle 71. The second sealing ball baffle 72 is coaxially located at the end of one end of the outer sleeve 11 with the second sealing ball 32 located between the second annular ball seat 22 and the second sealing ball baffle 72.
When the oil pump is in the upward stroke, under the action of larger suction, the first sealing ball 31 and the second sealing ball 32 can flow along with well bottom fluid to the well mouth, and are far away from the first annular ball seat 21 and the second annular ball seat 22, and when the oil pump is in the downward stroke, the first sealing ball 31 and the second sealing ball 32 cannot fall into the first annular ball seat 21 and the second annular ball seat 22, so that the fluid at the upper part of the sliding double-ball pump bottom valve returns to the lower part of the pump bottom valve again, and the pump efficiency is seriously reduced. The first sealing ball baffle 71 prevents the first sealing ball 31 from being far away from the first annular ball seat 21 and also prevents the first sealing ball 31 from entering the second annular ball seat 22, for example, after the support rod 50 has been withdrawn from the first annular ball seat 21 and the second annular ball seat 22, the first sealing ball 31 and the second sealing ball 32 are pushed away from each other in the downward direction of the first annular ball seat 21 by the fluid in the cylinder 10, and the first sealing ball 31 is prevented from being far away from the first annular ball seat 21 and the first sealing ball 31 is prevented from entering the second annular ball seat 22 when flowing upward. The second sealing ball stop 72 can limit the second sealing ball 32, preventing the second sealing ball 32 from exiting the barrel 10, and preventing the second sealing ball 32 from moving too far from the second annular ball seat 22. Therefore, the condition that the pump efficiency is low due to the fact that sealing balls cannot form a plug in oil pumping production is avoided, and the reliability of the sliding double-ball pump bottom valve is improved.
As shown in fig. 1, a second sealing ball baffle 72 is sandwiched between the end of the barrel 10 and the upper fitting 14. When the sliding double-ball pump bottom valve is assembled, the second annular ball seat 22, the inner sleeve 13, the first sealing ball 31, the first annular ball seat 21, the fixed sleeve 12 and the lower joint 15 are assembled with the outer sleeve 11 in sequence, the second sealing ball 32 is put into the outer sleeve 11, the second sealing ball baffle 72 is placed at the end part of the outer sleeve 11, and finally the upper joint 14 is connected with the cylinder 10.
The following is a schematic description of the working process of the sliding double-ball pump bottom valve provided in the embodiment of the present disclosure with reference to fig. 1:
in the oil pumping well, in the production pipe column, a sliding double-ball pump bottom valve is arranged below a suspension pump and above a packer and other downhole tools. After the production string is run into the designed position in the well, the tubing in the well is pressurized, and hydraulic pressure is transmitted from the upper joint 14 to the space in the well below the lower joint 15 through the second annular ball seat 22, the first annular ball seat 21 and the through-flow channel 40a, so that a packer in the production string is set, or other downhole tools such as an anchoring tool are triggered to work.
After triggering the downhole tool, the pressure in the tubing is again increased. When the difference between the downward pressure applied to the plunger piston 40 in the oil pipe and the pressure at the fluid inlet and outlet passage 10a reaches the shearing value of the shear pin 60, the shear pin 60 is sheared, and the plunger piston 40 moves downward under the strong pressure and inertia effects, so that the fluid inlet and outlet passage 10a is communicated with the fluid passage 40a. The support rod 50 is pulled away from the first annular ball seat 21 and the second annular ball seat 22 by the plunger 40, so that the second sealing ball 32 falls onto the second annular ball seat 22 and the first sealing ball 31 falls onto the first annular ball seat 21.
The first sealing ball 31 and the first annular ball seat 21 correspond to a single flow valve, and the second sealing ball 32 and the second annular ball seat 22 correspond to a single flow valve. The first sealing ball 31 falls onto the first annular ball seat 21, the second sealing ball 32 falls onto the second annular ball seat 22, the two check valves are closed, the blocking pressure continues to be transmitted from the upper joint 14 to the lower joint 15, and the liquid flow is prevented from flowing from the upper joint 14 to the liquid inlet and outlet channel 10a, the lower joint 15 and the space below the lower joint 15, so that the liquid flow can only flow unidirectionally from the liquid inlet and outlet channel 10a, the lower joint 15 and the space below the lower joint 15 to the upper joint 14, and the oil pumping production is facilitated.
In addition, the liquid flow outside the outer sleeve 11 can enter the fixed sleeve 12 through the liquid inlet and outlet channel 10a, push the first sealing ball 31 and the second sealing ball 32 upwards, and flow to the upper joint 14 and the space above the upper joint 14 to perform back flushing; the external hydraulic pressure of the outer sleeve 11 can also enter the inside of the fixed sleeve 12 through the liquid inlet and outlet passage 10a, and the pressure is transmitted to the lower joint 15 and the space below the lower joint 15 through the flow passage 40a.
The foregoing description of the preferred embodiments of the present disclosure is provided for the purpose of illustration only, and is not intended to limit the disclosure to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, alternatives, and alternatives falling within the spirit and principles of the disclosure.
Claims (10)
1. The sliding double-ball pump bottom valve is characterized by comprising a cylinder body (10), a first annular ball seat (21), a first sealing ball (31), a columnar piston (40), a second annular ball seat (22), a second sealing ball (32) and a supporting rod (50);
the first annular ball seat (21) is coaxially positioned in the cylinder (10), and the outer peripheral wall of the first annular ball seat (21) is attached to the inner wall of the cylinder (10);
the inner wall of the cylinder (10) is provided with an inner flange (121), the cylinder (10) is provided with a liquid inlet and outlet channel (10 a) penetrating through the side wall of the cylinder (10), and the liquid inlet and outlet channel (10 a) is positioned between the inner flange (121) and the first annular ball seat (21);
the columnar piston (40) is provided with a through-flow channel (40 a) extending along the axial direction of the columnar piston, and the through-flow channel (40 a) is communicated with two end surfaces of the columnar piston (40);
the cylindrical piston (40) is coaxially positioned in the cylinder body (10), an outer flange (41) is arranged at one end, close to the first annular ball seat (21), of the cylindrical piston (40), the outer flange (41) is positioned between the first annular ball seat (21) and the liquid inlet and outlet channel (10 a), a gap is arranged between the outer flange and the first annular ball seat (21), and the axial width of the outer flange (41) is smaller than the maximum distance from the through-flow channel (40 a) to one side surface, close to the outer flange (41), of the inner flange (121);
the outer flange (41) is in sliding sealing fit with the inner wall of the cylinder body (10), and one end of the columnar piston (40) away from the first annular ball seat (21) is in sliding sealing fit with the inner wall of the inner flange (121);
the columnar piston (40) is connected with the side wall of the cylinder body (10) through a shear pin (60);
the second annular ball seat (22) is coaxially arranged in the cylinder body (10), and is arranged on one side of the first annular ball seat (21) away from the columnar piston (40);
the support rod (50) is connected with the end face of the columnar piston (40) close to one end of the first annular ball seat (21), the support rod (50) penetrates through the first annular ball seat (21) and the second annular ball seat (22), gaps are reserved between the support rod and the inner wall of the first annular ball seat (21) and between the support rod and the inner wall of the second annular ball seat (22), and the distance between the end face of the support rod (50) far away from one end of the columnar piston (40) and the end face of the first annular ball seat (21) close to one end of the columnar piston (40) is smaller than the distance between the outer flange (41) and the inner flange (121);
the first sealing ball (31) is located between the first annular ball seat (21) and the second annular ball seat (22), the diameter of the first sealing ball (31) is larger than the inner diameter of the first annular ball seat (21), the second sealing ball (32) is located on one side, away from the first annular ball seat (21), of the second annular ball seat (22), and the diameter of the second sealing ball (32) is larger than the inner diameter of the second annular ball seat (22).
2. The sliding double ball pump bottom valve according to claim 1, characterized in that the cylinder (10) comprises an outer sleeve (11) and a fixed sleeve (12);
the side wall of the outer sleeve (11) is provided with a first through hole (11 a);
the side wall of the fixed sleeve (12) is provided with a second through hole (12 a), the fixed sleeve (12), the first annular ball seat (21) and the second annular ball seat (22) are coaxially positioned in the outer sleeve (11), and the second through hole (12 a) is communicated with the first through hole (11 a) to form the liquid inlet and outlet channel (10 a);
the inner flange (121) is located in an end of the fixed sleeve (12) remote from the first annular ball seat (21);
the cylindrical piston (40) is located in the stationary sleeve (12).
3. The sliding double ball pump bottom valve according to claim 2, characterized in that the shear pins (60) are inserted in the side walls of the stationary sleeve (12) and in the peripheral wall of the outer flange (41).
4. The sliding double-ball pump bottom valve according to claim 2, characterized in that the inner wall of the outer sleeve (11) has a limit spigot (111), and that the end of the second annular ball seat (22) remote from the first annular ball seat (21) abuts against the limit spigot (111);
the barrel (10) further comprises an inner sleeve (13), the inner sleeve (13) is coaxially arranged in the outer sleeve (11) and is arranged between the first annular ball seat (21) and the second annular ball seat (22), and two ends of the inner sleeve (13) are respectively propped against the first annular ball seat (21) and the second annular ball seat (22);
the fixing sleeve (12) is propped against the first annular ball seat (21).
5. The sliding double ball pump bottom valve of claim 4, further comprising a first sealing ball baffle (71) and a second sealing ball baffle (72), the first sealing ball baffle (71) and the second sealing ball baffle (72) each having a plurality of third through holes (70 a);
the first sealing ball baffle (71) is coaxially arranged at the end part of the second annular ball seat (22) close to one end of the first annular ball seat (21), and the supporting rod (50) penetrates through a third through hole (70 a) of the first sealing ball baffle (71);
the second sealing ball baffle (72) is coaxially located at the end of one end of the outer sleeve (11), and the second sealing ball (32) is located between the second annular ball seat (22) and the second sealing ball baffle (72).
6. The sliding double-ball pump bottom valve according to any one of claims 2 to 5, characterized in that the cylinder (10) further comprises an upper joint (14) and a lower joint (15), the upper joint (14) and the lower joint (15) are respectively coaxially connected to both ends of the outer sleeve (11), and the lower joint (15) is located at one end of the fixing sleeve (12) away from the first annular ball seat (21).
7. The sliding double ball pump bottom valve according to claim 6, characterized in that the end of the lower joint (15) abuts against the end of the fixed sleeve (12).
8. The sliding double-ball pump bottom valve according to any one of claims 1 to 5, characterized in that the inner bore of the first annular ball seat (21) and the inner bore of the second annular ball seat (22) are conical surfaces.
9. The sliding double-ball pump bottom valve according to any one of claims 1 to 5, characterized in that sealing rings (81) are provided between the outer flange (41) and the inner wall of the cylinder (10), and between the cylindrical piston (40) and the inner flange (121).
10. The sliding double-ball pump bottom valve according to any one of claims 1 to 5, characterized in that the support rod (50) is coaxially connected to the columnar piston (40), the columnar piston (40) has a plurality of the flow-through passages (40 a), and the plurality of the flow-through passages (40 a) are arranged at equal angular intervals along the circumferential direction of the columnar piston (40).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110156000.0A CN114856491B (en) | 2021-02-04 | 2021-02-04 | Sliding double-ball pump bottom valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110156000.0A CN114856491B (en) | 2021-02-04 | 2021-02-04 | Sliding double-ball pump bottom valve |
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| Publication Number | Publication Date |
|---|---|
| CN114856491A CN114856491A (en) | 2022-08-05 |
| CN114856491B true CN114856491B (en) | 2023-12-26 |
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| CN202110156000.0A Active CN114856491B (en) | 2021-02-04 | 2021-02-04 | Sliding double-ball pump bottom valve |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103422846A (en) * | 2013-07-19 | 2013-12-04 | 中国石油天然气股份有限公司 | Open hole horizontal well completion fracturing integrated pipe column |
| CN105298461A (en) * | 2015-11-03 | 2016-02-03 | 东北石油大学 | Full-bore infinite-time soluble-ball-type fracturing sliding sleeve |
| CN210598939U (en) * | 2019-09-16 | 2020-05-22 | 中国石油化工股份有限公司 | Acid-injection integrated pipe column |
-
2021
- 2021-02-04 CN CN202110156000.0A patent/CN114856491B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103422846A (en) * | 2013-07-19 | 2013-12-04 | 中国石油天然气股份有限公司 | Open hole horizontal well completion fracturing integrated pipe column |
| CN105298461A (en) * | 2015-11-03 | 2016-02-03 | 东北石油大学 | Full-bore infinite-time soluble-ball-type fracturing sliding sleeve |
| CN210598939U (en) * | 2019-09-16 | 2020-05-22 | 中国石油化工股份有限公司 | Acid-injection integrated pipe column |
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| CN114856491A (en) | 2022-08-05 |
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