CN208203219U - A kind of interior blowout-preventing ball seat - Google Patents
A kind of interior blowout-preventing ball seat Download PDFInfo
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- CN208203219U CN208203219U CN201820277095.5U CN201820277095U CN208203219U CN 208203219 U CN208203219 U CN 208203219U CN 201820277095 U CN201820277095 U CN 201820277095U CN 208203219 U CN208203219 U CN 208203219U
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Abstract
The utility model relates to a kind of interior blowout-preventing ball seats of oilfield oil well allowing pressurized maintenance operation, including upper ball base, lower ball base and valve ball, upper ball base and lower ball base surround the valve chamber up and down for valve ball, lower ball base includes outer sleeve body and the central tube that is arranged in outer sleeve body, the lower sealing mating surface being adapted to valve ball is equipped at the upper end opening of central tube, there is annular space between outer sleeve body and central tube, is equipped in annular space for pressing valve ball to the spring reset structure in upper sealing mating surface.In lift pipe string or lower tubular column, valve ball is fitted close by spring reset structure support and upper ball base；When Seal Oil overpressure, high-pressure fluid is injected in upper tubing string, valve ball and spring reset structure move downwardly together, until valve ball and central tube are fitted close, therefore, this structure realizes the function of preventing spraying in fluid.The utility model insulates borehole fluid pressure instead of plugging device in tubing string, has many advantages, such as that structure is simple, and work efficiency is high, realizes secondary blowout prevention.
Description
Technical field
The utility model relates to a kind of interior blowout-preventing ball seats of oilfield oil well allowing pressurized maintenance operation.
Background technique
In oil recovery process, need often to carry out maintainability to remove flow string operation.Make when remove flow string
When industry, since strata pressure is big, the crude oil in well can be sprayed from pit shaft, bring difficulty to the construction operation of worker, greatly
Job execution progress, quality and safety are affected, while also can also cause environmental pollution.
Currently, bottom ball seat used in the water injection string of oilfield oil well, card water plugging string, is to realize Seal Oil
Pressure, circulation well cleanup in pipe and the unidirectional pressure stop ball seat for designing application.In running string or card water plugging string, in oil well
The valve ball that will open in ball seat of fluid enter in tubing string, in the case where borehole pressure height, fluid can prolong tubing string uplink from
Well head sprays.Therefore, when oil well carries out normal pressure maintenance activity, need to seal device in running string to prevent from altering on fluid.Complete well
Afterwards, it increases and salvages plugging device outfit, process flow and workload.
Notification number is CN2554344Y, and the day for announcing is that the Chinese patent on June 4th, 2003 discloses a kind of only pressure capable of reversing
Ball seat, as shown in Figure 1.In tubing string decentralization process, steel ball is by baffle support in upper ball base, and steel ball is under borehole fluid pressure
It is seated in upper ball base, fluid is prevented to enter in tubing string, solves the problems, such as spray in fluid when decentralization tubing string.When work, it is necessary to which well head is beaten
Pressure falls in steel ball on lower ball base, and seals oil pipe.Later, set packer can be carried out, open water filling or the switch etc. that recovers the oil.But
Be, for this structure, when lift pipe string required running string plugging device, otherwise will lose the function of preventing spraying in fluid, increase
Process flow and workload.
Utility model content
The purpose of this utility model is to provide a kind of interior blowout-preventing ball seats, eliminate required in lift pipe string or running string
The process flow of plugging device, improves work efficiency.
To achieve the above object, the technical solution of the utility model is:
Scheme 1: a kind of interior blowout-preventing ball seat, including upper ball base, lower ball base and valve ball, upper ball base and lower ball base are surrounded for valve ball
Up and down valve chamber, upper ball base have the upper sealing mating surface being adapted to valve ball, and lower ball base includes outer sleeve body and is arranged outside
Intracorporal central tube is covered, is equipped with the lower sealing mating surface being adapted to valve ball, outer sleeve body and central tube at the upper end opening of central tube
Between there is annular space, be equipped in annular space for by the spring reset structure in valve ball press to upper sealing mating surface.
The utility model has the advantages that fluid beneath pressure acts on valve ball when lift pipe string or lower tubular column, valve ball and upper ball base it is upper
Mating surface fitting is sealed, to play the function of preventing well fluids downhole from gushing out out of tubing string.When needing Seal Oil overpressure
When, the interior pressurization of tubing string, upper flow pressure is greater than fluid beneath pressure, and upper flow pressure acts on steel ball and spring reset knot
On structure, valve ball is detached from the upper sealing mating surface of upper ball base and fits closely and sealed in oil pipe with the lower sealing mating surface of central tube
Pressure.This structure is simple, and applied to the allowing pressurized maintenance operation field of oilfield oil well, when lift pipe string and lower tubular column can play anti-
The effect only sprayed in well fluids downhole can replace the pressure of plugging device packing borehole fluid in tubing string with it, remove to exempt
Process flow needed for plugging device, improves work efficiency in column tube or running string, reduces costs.At the same time, it resets
Spring structure plays the role of cushion effect, slows down valve ball and upper ball base/lower ball base impact force.
Scheme 2: on the basis of scheme 1, the spring reset structure includes the piston being arranged in annular space, described
Piston is slidable in the vertical direction sealing cooperation with outer sleeve body and central tube simultaneously, and upper spring is equipped between valve ball and top land,
Lower spring is equipped between the bottom and lower ball base of piston.
The utility model has the advantages that be equipped with piston in offsetting spring structure, and piston simultaneously with outer sleeve body and central tube along the vertical direction
It is slidingly sealed cooperation.Using this structure, when upper flow pressure is greater than fluid beneath pressure, fluid will not enter piston
Lower section, and piston upper end two sides also will receive the pressure of fluid and piston pushed to move down.
Scheme 3: on the basis of scheme 2, outer sleeve body includes the connector sleeve and spring base being connected in turn below upper ball base,
The lower end of central tube is fixed on spring base.
Scheme 4: on the basis of scheme 3, on the inner wall of the connector sleeve above piston be equipped with block step, piston with
The block step is along axial block cooperation.
Scheme 5: on the basis of scheme 4, the block step is lower than the upper surface of central tube.
Scheme 6: on the basis of scheme 3,4 or 5, the top of piston has the upper guiding that cooperation is slidingly sealed with connector sleeve
Section, the bottom of piston have the lower guide section that cooperation is slidingly sealed with spring base.
Scheme 7: on the basis of scheme 6, the inner hole of spring base is up big and down small stepped hole, and the stepped hole has court
The step surface for being used to support spring reset structure upwards, central tube be fixed in the path section of stepped hole and with stepped hole
Path section sealing cooperation.
Scheme 8: on the basis of scheme 2, spring pressure cap is equipped at the top of the upper spring, the middle part of spring pressure cap is equipped with circle
Taper hole, the maximum outside diameter of conical bore are less than the outer diameter of valve ball.
Scheme 9: on the basis of any one of scheme 2-5, the string diameter of upper spring is less than the string diameter of lower spring.
Scheme 10: on the basis of any one of scheme 2-5, the top land is equipped with and is used to support the recessed of upper spring
Slot.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of reversable pressure stop ball seat in the prior art；
Fig. 2 is the structural schematic diagram of blowout-preventing ball seat in the utility model.
Description of symbols: 1. upper ball bases；2. steel ball；3. spring pressure cap；4. upper spring；5. connector sleeve；6. piston；Under 7.
Spring；8. spring base；9. central tube；10. sealing ring；11. baffle；12. lower ball base.
Specific embodiment
The embodiments of the present invention is described further with reference to the accompanying drawing.
The embodiment 1 of blowout-preventing ball seat in the utility model, as shown in Fig. 2, the interior blowout-preventing ball seat includes upper ball base 1, steel ball
2, connector sleeve 5, spring base 8, central tube 9,1 lower part of upper ball base are threadedly coupled with 5 top of connector sleeve, 5 lower part of connector sleeve and spring
8 tops of seat are threadedly coupled, and the inner hole of 8 bottom of spring base is up big and down small stepped hole, and central tube 9 passes through screw thread and inner bore of step
Path section connection, sealing ring 10 is equipped with below link position, and the lower end with central tube 9 is equipped in the path section of stepped hole
The block land of block cooperation.
The lower end inner cavity of upper ball base 1 and the upper end inner cavity of central tube 9 are equipped with smooth sealing cone, and on sealing cone
Circular conical surface maximum outside diameter be less than steel ball 2 outer diameter.The upper end inner cavity of upper ball base 1 is equipped with the screw thread for connecting with tubing string.
9 top of central tube is extend into inside connector sleeve 5, is had between upper ball base 1, connector sleeve 5, spring base 8 and central tube 9
Annular space, the interior spring reset structure being equipped with for the press of steel ball 2 to be arrived to 1 sealing cone of upper ball base of annular space.Upper ball base
1, there is the space up and down for steel ball 2 between central tube 9 and connector sleeve 5.
Spring reset structure includes spring pressure cap 3, upper spring 4, piston 6, lower spring 7 and successively overlaps from top to bottom.Steel
Ball 2 is set to 3 upper end of spring pressure cap.Groove is equipped at the top of piston 6,4 bottom end of upper spring is fixedly connected on inside grooves.Spring base 8
There is the step surface of spring 7 under being used to support upward at the stepped hole of bottom.The string diameter of upper spring 4 is less than lower spring 7
String diameter.The middle part of spring pressure cap 3 is equipped with conical bore, and the maximum outside diameter of conical bore is less than the outer diameter of steel ball 2.
5 inner wall of connector sleeve is equipped with block step, and 6 upper end of piston and the block step axial direction block cooperate, and block
The position of step axial direction is lower than the position of 9 upper end of central tube.The top of piston 6, which has, is slidingly sealed the upper of cooperation with connector sleeve 5
Guide section, the bottom of piston 6 have the lower guide section that cooperation is slidingly sealed with spring base 8.The outer diameter of upper guide section is led under being greater than
To the outer diameter of section, the outer diameter at position is less than the outer diameter of lower guide section between upper guide section and lower guide section.The piston 6 with connect
The position that set 5, spring base 8, central tube 9 are slidably matched is equipped with sealing ring 10.
The upper end inner cavity of the upper ball base 1 of the utility model is to be threadedly coupled with tubing string, with pressure when carrying out to oilfield oil well
When maintenance activity, during running string or lift pipe string, steel ball 2 spring reset structure elastic force effect under, with
The sealing cone of upper ball base 1 is fitted close, to play the function of preventing well fluids downhole from gushing out out of tubing string.When needing to seal
When oily overpressure, pressurization in upper tube, steel ball 2 is detached from the sealing cone of upper ball base 1.Fluid acts on pressure on steel ball 2,
Steel ball 2 drives spring pressure cap 3,4 downlink of upper spring, and transmits pressure on piston 6, at the same time, overpressure and piston 6
And the pressure difference of the hydrostatic formation between lower ball base 12 also will push 6 downlink of piston.Under the action of overpressure, steel ball 2
Seal Oil overpressure is fitted closely with the sealing cone of central tube 9.Later, can carry out set packer, open water filling or
Recover the oil switch.Therefore, it repairs to oilfield, by this device, eliminates in running string needed for plugging device
Process flow and workload, to improve work efficiency.If you need to well-flushing, certain pressure is added in top tubing string, sets steel ball 2
It, at this time can be with circulation well cleanup between upper ball base 1 and the sealing cone of central tube 9.
The embodiment 2 of blowout-preventing ball seat in the utility model, difference from example 1 is that, spring reset structure by
One spring is constituted.
The embodiment 3 of blowout-preventing ball seat in the utility model, difference from example 1 is that, outer sleeve body is one whole
Body structure.
The embodiment 4 of blowout-preventing ball seat in the utility model, difference from example 1 is that, it is outer in lower ball base 12
Body has stepped hole, and stepped hole includes major diameter section and path section, and 9 lower end of central tube is fixedly connected with path section and is equipped with sealing ring
10, piston 6 is the open column shape structure that cooperation is slidingly sealed with outer sleeve body major diameter section and 9 outer wall of central tube.
Claims (10)
1. a kind of interior blowout-preventing ball seat, including upper ball base, lower ball base and valve ball, upper ball base and lower ball base surround up and down for valve ball
Valve chamber, upper ball base has the upper sealing mating surface that be adapted to valve ball, it is characterised in that: lower ball base includes that outer sleeve body and being arranged exists
Housing intracorporal central tube is equipped with the lower sealing mating surface being adapted to valve ball, outer sleeve body and center at the upper end opening of central tube
There is annular space between pipe, is equipped in annular space for pressing valve ball to the spring reset knot in upper sealing mating surface
Structure.
2. interior blowout-preventing ball seat according to claim 1, it is characterised in that: the spring reset structure includes being arranged in annular
Piston in space, the piston are slidable in the vertical direction sealing cooperation, valve ball and piston top with outer sleeve body and central tube simultaneously
It is equipped with upper spring between portion, lower spring is equipped between the bottom and lower ball base of piston.
3. interior blowout-preventing ball seat according to claim 2, it is characterised in that: outer sleeve body includes being connected in turn below upper ball base
Connector sleeve and spring base, the lower end of central tube is fixed on spring base.
4. interior blowout-preventing ball seat according to claim 3, it is characterised in that: set above piston on the inner wall of the connector sleeve
There are block step, piston and the block step to cooperate along axial block.
5. interior blowout-preventing ball seat according to claim 4, it is characterised in that: the block step is lower than the upper end of central tube
Face.
6. according to interior blowout-preventing ball seat described in claim 3,4 or 5, it is characterised in that: the top of piston has sliding with connector sleeve
The upper guide section of dynamic sealing cooperation, the bottom of piston have the lower guide section that cooperation is slidingly sealed with spring base.
7. interior blowout-preventing ball seat according to claim 6, it is characterised in that: the inner hole of spring base is up big and down small step
Hole, the stepped hole have the step surface for being used to support spring reset structure upward, and central tube is fixed on stepped hole
It seals in path section and with the path section of stepped hole and cooperates.
8. interior blowout-preventing ball seat according to claim 2, it is characterised in that: be equipped with spring pressure cap, bullet at the top of the upper spring
The middle part of spring pressure cap is equipped with conical bore, and the maximum outside diameter of conical bore is less than the outer diameter of valve ball.
9. the interior blowout-preventing ball seat according to any one of claim 2-5, it is characterised in that: under the string diameter of upper spring is less than
The string diameter of spring.
10. the interior blowout-preventing ball seat according to any one of claim 2-5, it is characterised in that: the top land is equipped with
It is used to support the groove of upper spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820277095.5U CN208203219U (en) | 2018-02-27 | 2018-02-27 | A kind of interior blowout-preventing ball seat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820277095.5U CN208203219U (en) | 2018-02-27 | 2018-02-27 | A kind of interior blowout-preventing ball seat |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208203219U true CN208203219U (en) | 2018-12-07 |
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ID=64535323
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820277095.5U Active CN208203219U (en) | 2018-02-27 | 2018-02-27 | A kind of interior blowout-preventing ball seat |
Country Status (1)
| Country | Link |
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| CN (1) | CN208203219U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110644947A (en) * | 2019-11-12 | 2020-01-03 | 东营市瑞丰石油技术发展有限责任公司 | Valve and tubular column |
| CN112761596A (en) * | 2021-01-13 | 2021-05-07 | 孙伟峰 | Pressure guide structure of pump |
-
2018
- 2018-02-27 CN CN201820277095.5U patent/CN208203219U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110644947A (en) * | 2019-11-12 | 2020-01-03 | 东营市瑞丰石油技术发展有限责任公司 | Valve and tubular column |
| CN112761596A (en) * | 2021-01-13 | 2021-05-07 | 孙伟峰 | Pressure guide structure of pump |
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