CN208845141U - The core of circumference filling sealing and self-priming float collar float plug - Google Patents
The core of circumference filling sealing and self-priming float collar float plug Download PDFInfo
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- CN208845141U CN208845141U CN201821388403.8U CN201821388403U CN208845141U CN 208845141 U CN208845141 U CN 208845141U CN 201821388403 U CN201821388403 U CN 201821388403U CN 208845141 U CN208845141 U CN 208845141U
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- valve body
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- valve seat
- priming
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Abstract
The utility model relates to a kind of circumference filling sealing and the cores of self-priming float collar float plug.Mainly solve the problems, such as existing float collar float plug and self-filling-type float collar float shoe core poor sealing and not erosion resistance.It is characterized by: valve seat (6) intracavity bottom is provided with groove, valve seat (6) center cavity is built-in with cylindrical valve body (4), and cylindrical valve body (4) bottom has limit shoulder (8), and limit shoulder can be corresponding with the groove of valve seat (6) intracavity bottom；The top of cylindrical valve body (4) is fixed restraining position ring block (3), and spring (5) are housed between stop collar (3) valve seat (6) corresponding with lower part；Cylindrical valve body (4) lower part is provided with by-pass prot (17).The core of circumference filling sealing and self-priming float collar float plug is, it can be achieved that self-priming function, sealed reliable, erosion resistance.
Description
Technical field
The utility model relates to oil drilling Well Completion Engineering of Oil Reservoirs technical field, in particular to a kind of circumference filling sealing and self-priming
The core of float collar float plug.
Background technique
The float collar float plug that Completion Operations use is the key tool of the circulation of fluid forward direction and reversed non-return, self-filling-type float collar
Float shoe be it is fashionable under casing string can pour into drilling fluid automatically, self-priming function releasing after, revert to normal function float collar float plug.
Core of the key structure of float collar float plug for inside, the seal form of conventional core, mainly spherical or hemispheric valve body, according to
By the reset force of spring, realization is extrusion type sealed with the valve seat conical surface, and the stickiness of spring restoring force and sealing surface determines close
The performance of envelope.The characteristics of due to valve body sealing surface being spherical surface, the joint place with the valve seat conical surface be approximately it is round, conformability is poor.
By the way that the reversed sealing of float collar float plug can be improved after increasing contact area and there is certain elasticity in sealing surface vulcanized rubber
Property.But when circulating fluid and cementing operation, high speed axial flow of fluid at valve seat flowing hole generates valve seat and valve body sealing surface
Erosion, sealing surface, which is easy to appear breakage, leads to reversed seal failure.
For self-filling-type float collar float shoe at present only in the less application of straight well well type, key structure is internal self filling type core, main
It will be by structure compositions such as turnover plate type valve body, valve seat, position-limiting drums.When initial, valve body is limited in open state, position-limiting drum by position-limiting drum
Central through hole connection casing string inside and annular space, it is fashionable under casing to pour into drilling fluid automatically.After casing string tripping in, throw
Ball is fallen on position-limiting drum, and building the pressure makes position-limiting drum fall into shaft bottom, and valve body relies on the reset force of torque spring, is realized and the valve seat conical surface
It is extrusion type sealed.Since the valve body of self-filling-type float collar float shoe is reverse turning bed structure, the laminating degree in circular seal face is not consistent, sternly
Ghost image rings reversed sealing.By the way that leakproofness can be enhanced in sealing surface vulcanized rubber, but high-velocity fluid erosion suffered by rubber layer
Degree is different, and rubber layer is easy to appear asymmetric erosion and damaged, therefore reversed sealing mistake often occurs in self-filling-type float collar float shoe
Effect.
The reversed seal failure of float collar float plug will cause casing string to stay the quality accidents such as plug, bring larger economic damage to oil field
It loses.
Summary of the invention
Technical problem to be solved in the utility model is to overcome existing float collar float plug and self-priming present in background technique
Formula floating-dog gloating-shoe core-body poor sealing, not erosion resistance the problem of, and provide a kind of circumference filling sealing and self-priming float collar float plug
Core, the circumference filling sealing and self-priming float collar float plug core, it can be achieved that self-priming function, sealed reliable, erosion resistance.
The invention for solving the technical problem can reach by following technical solution: circumference filling sealing and self-priming float collar
The core of float shoe, including valve seat, the valve base cavity bottom are provided with groove, and valve seat center cavity is built-in with cylindrical valve body, cylindrical valve
Limit shoulder is arranged at body bottom, and limit shoulder can be corresponding with the groove of valve base cavity bottom；The top of cylindrical valve body is fixed with limit
Ring is equipped with spring between stop collar valve seat corresponding with lower part；Cylindrical valve body lower part is provided with by-pass prot
The utility model can have the following beneficial effects: circumference filling sealing and self-priming compared with above-mentioned background technique
The core of float collar float plug, sealing surface are the cylinder and shoulder plane at cylindrical valve body and valve seat shoulder, the multiple groups cooperation of sealing surface
So that sealing effect is more guaranteed；When cylindrical valve body moves axially in valve seat, radial missing will not be generated, reset more may be used
It leans on；The center flowing hole and bypass pore structure of cylindrical valve body can change flow direction, avoid the sealing surface of lower part by erosion, have
Effect guarantees leakproofness；Sealing surface saves rubber vulcanization process, and using " O " type sealing ring of standard, technique is easier；Bottom
Collecting chamber can collect larger block, and block is avoided to be stuck at the annular space of valve body shoulder and shell, lead to not reset production
Raw seal failure.Position-limit mechanism can choose whether to install, and two sealing surfaces separate certain distance after installation, after by-pass prot is exposed,
Float collar float plug can realize self-priming.Position limiting structure is simple and reliable in action, will not limit, guarantee reversed again after automatically terminating
Leakproofness, and save pitching and the operation such as build the pressure.The float collar float plug sealed reliable, erosion resistance, structure are simple, assembling is easy, limit
Self-priming function is optional and can automatically terminate, is suitable for various well type, improves casing string tripping in efficiency, reduces the labor of worker
Fatigue resistance can more preferably meet oil field development needs.
Detailed description of the invention
Attached drawing 1 is the structural schematic diagram of the utility model；
Attached drawing 2 is the self-priming float collar open state structural schematic diagram of the utility model；
Attached drawing 3 is the self-priming float shoe closed state structural schematic diagram of the utility model.
In figure: 1, shell, 2, retainer ring, 3, stop collar, 4, cylindrical valve body, 5, spring, 6, valve seat, 7, collection object chamber, 8, limit
Position shoulder, 9, newel, 10, support frame, 11, elastic slice, 12, pin shaft, 13, torque spring, 14, gag lever post, 15, sealing ring A,
16, sealing ring B, 17, by-pass prot, 18, flowing hole, 19, shaft retaining ring, 20, hole retaining ring, 21, spherical guide shoe.
Specific embodiment:
The utility model is described in further detail with reference to the accompanying drawing:
As shown in Fig. 1, the core of circumference filling sealing and self-priming float collar float plug, including valve seat 6, in the valve seat 6
Bottom of chamber portion is provided with groove, and 6 center cavity of valve seat is built-in with cylindrical valve body 4, and there is limit shoulder 8 in 4 bottom of cylindrical valve body, limits shoulder
It can be corresponding with the groove of 6 intracavity bottom of valve seat；The top of the cylindrical valve body 4 fixed restraining position ring block 3 of shaft retaining ring 19, stop collar 3 with
Spring 5 is housed between the corresponding valve seat 6 in lower part；4 lower part of cylindrical valve body is provided with by-pass prot 17,17 lower section cylindrical valve body 4 of by-pass prot
Inside is collection object chamber 7, can collect larger block in mud, cylindrical valve body 4 is prevented to be stuck；4 lower central of cylindrical valve body
Place is fixedly connected with newel 9, and 9 two sides of newel connect support frame 10, pass through pin shaft 12 and torsion at 10 two ends of support frame
13 mounting elastic sheet 11 of power spring；Corresponding 11 end point of elastic slice of valve seat 6 connects gag lever post 14, and cylindrical valve body 4 moves down the expansion of elastic slice 11
After can be stuck in 14 end card slot of gag lever post；There is two seals A15 between cylindrical valve body 4 and valve seat 6；6 external screw-thread of valve seat
Connect shell 1；1 cavity top through hole retaining ring 20 of shell is fixedly connected with retainer ring 2, plays the role of overcurrent and rubber plug bruising；Institute
It states retainer ring 2 and 4 center of cylindrical valve body is provided with flowing hole 18；1 bottom external screw thread of shell connects spherical guide shoe 21；Shell 1 and valve
Sealing ring B16 is housed between seat 6.As shown in Fig. 2, the 6 outside spiral shell of valve seat of the core of circumference filling sealing and self-priming float collar float plug
Line connects shell 1, and 1 cavity top through hole retaining ring 20 of shell is fixedly connected with retainer ring 2, constitutes circumference filling sealing and self-priming is floating
Hoop；As shown in figure 3, the 1 bottom external screw thread of shell of circumference filling sealing and self-priming float collar connects spherical guide shoe 21, constitutes circumference and fill out
Fill sealing and self-priming float shoe.
There is flowing hole at the retainer ring center, is fixed on above the core of circumference filling sealing and self-priming float collar float plug
Rubber plug bruising is realized on shell cavity top.Core is by cylindrical valve body, valve seat, stop collar, spring, retaining ring and sealing ring group
At the cylindrical valve body has structures, flowing hole and the by-pass prots such as center flowing hole, by-pass prot, limit shoulder by fluid stream
To by being axially changed to radial direction, limit shoulder plays limit and sealing function.The sealing surface of cylindrical valve body is by-pass prot or less and limits
Cylinder and shoulder plane at shoulder two, the change of fluid flow direction, effectively avoids the direct erosion sealing surface of fluid in valve body.It is described
Valve seat be threadingly attached on shell, central through hole meet valve body move axially and seal therewith, used between sealing surface
The filling sealing of " O " type rubber ring.The stop collar plays fixed spring, is fixed at the top of cylindrical valve body with retaining ring, by valve
It is connect after body, valve seat and spring assembling are integrated and with shell.
Limit self-priming mechanism is made of newel, support frame, elastic slice, pin shaft, torque spring, gag lever post.The center
Column is connected on the newel of cylindrical valve body bottom in cylindrical valve body bottom, the support frame, with spring and pin shaft and elastic slice
It is assembled into one.The gag lever post chooses appropriate length, is symmetrically arranged on valve seat.Cylindrical valve body moves down elastic slice exhibition when initial
It opens and is stuck on gag lever post, make to generate separation between two sealing surfaces, by-pass prot, which is exposed, realizes self-priming.When casing string tripping in end loop is bored
When well liquid, since head of liquid increases, cylindrical valve body is moved down, and the elastic slice of position-limit mechanism is detached from the limitation of gag lever post, is being turned round
The effect of power spring is lower to be resetted, and limit function will not limit again after releasing, and become common float collar float plug, realize fluid just
To circulation and reversed non-return.
Circumference filling sealing and the core assembling of self-priming float collar float plug are in use, the cylindrical valve body installs sealing ring
Afterwards, by being passed through below valve seat, spring is packed into from cylindrical valve body upper end, stop collar is pressed into and is fixed with retaining ring, the valve seat
It is threadingly attached on shell after installation sealing ring, retainer ring is packed into from female end and is fixed with retaining ring, and float shoe connection is drawn
Shoes complete assembling.When accessing casing string construction, when fluid column positive pressure is greater than opposite force above float collar float plug, spring is compressed,
Cylindrical valve body moves down, and by-pass prot leaks out, and forms access with core lower space.After construction, positive pressure is less than anti-
To actuating pressure, the cylindrical valve body of float collar float plug resets under spring restoring force effect, cooperatively forms reversely with sealing surface of seat
Circumference filling sealing.
When installing position-limit mechanism, the gag lever post is connected to seat bottom portion, and support frame is mounted on newel, and both ends pass through
Torque spring and pin shaft are equipped with elastic slice.After the elastic slice is moved down in cylindrical valve body part, it is unfolded and is stuck in limit boom end
Complete assembling.Fashionable under casing string, the circulation port of self-filling-type float collar float shoe core is open state, and drilling fluid can pour into casing
It is interior, save the activity duration.When circulating fluid, fluid column positive pressure increases above float collar float plug, and spring is compressed, cylindrical valve body
It moves down, elastic slice is detached from gag lever post and resets, and limit function automatically terminates, and becomes common float collar float plug at this time, meets fluid
Forward direction circulation and reversed non-return.
Claims (7)
1. the core of a kind of circumference filling sealing and self-priming float collar float plug, including valve seat (6), it is characterised in that: the valve seat (6)
Intracavity bottom is provided with groove, and valve seat (6) center cavity is built-in with cylindrical valve body (4), and limit shoulder is arranged at cylindrical valve body (4) bottom
(8), limit shoulder can be corresponding with the groove of valve seat (6) intracavity bottom；The top of cylindrical valve body (4) is fixed restraining position ring block (3), limit
Spring (5) are housed between position ring (3) valve seat (6) corresponding with lower part；Cylindrical valve body (4) lower part is provided with by-pass prot (17).
2. the core of circumference filling sealing according to claim 1 and self-priming float collar float plug, it is characterised in that: the cylindricality
It is fixedly connected with newel (9) at valve body (4) lower central, newel (9) two sides connect support frame (10), support frame (10) two
End point passes through pin shaft (12) and torque spring (13) mounting elastic sheet (11)；Corresponding elastic slice (11) the end point connection of valve seat (6)
Gag lever post (14), cylindrical valve body (4) can be stuck in gag lever post (14) end after moving down elastic slice (11) expansion.
3. the core of circumference filling sealing according to claim 1 or 2 and self-priming float collar float plug, it is characterised in that: described
Valve seat (6) external screw-thread connects shell (1)；Shell (1) cavity top through hole retaining ring (20) is fixedly connected with retainer ring (2)；It is described
Retainer ring (2) and cylindrical valve body (4) center are provided with flowing hole (18).
4. the core of circumference filling sealing according to claim 3 and self-priming float collar float plug, it is characterised in that: the shell
(1) bottom thread connects spherical guide shoe (21).
5. the core of circumference filling sealing according to claim 1 and self-priming float collar float plug, it is characterised in that: the bypass
It is collection object chamber (7) inside cylindrical valve body (4) below hole (17).
6. the core of circumference filling sealing according to claim 1 or 2 and self-priming float collar float plug, it is characterised in that: described
There is two seals A(15 between cylindrical valve body (4) and valve seat (6)).
7. the core of circumference filling sealing according to claim 3 and self-priming float collar float plug, it is characterised in that: the shell
(1) sealing ring B(16 is housed between valve seat (6)).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821388403.8U CN208845141U (en) | 2018-08-27 | 2018-08-27 | The core of circumference filling sealing and self-priming float collar float plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821388403.8U CN208845141U (en) | 2018-08-27 | 2018-08-27 | The core of circumference filling sealing and self-priming float collar float plug |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208845141U true CN208845141U (en) | 2019-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821388403.8U Active CN208845141U (en) | 2018-08-27 | 2018-08-27 | The core of circumference filling sealing and self-priming float collar float plug |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115434663A (en) * | 2022-07-19 | 2022-12-06 | 中国石油天然气集团有限公司 | Side opening type air-tight sealing back pressure valve and downhole tool pipe string |
-
2018
- 2018-08-27 CN CN201821388403.8U patent/CN208845141U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115434663A (en) * | 2022-07-19 | 2022-12-06 | 中国石油天然气集团有限公司 | Side opening type air-tight sealing back pressure valve and downhole tool pipe string |
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