CN208184710U - Shearing casing annulus relief valve - Google Patents
Shearing casing annulus relief valve Download PDFInfo
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- CN208184710U CN208184710U CN201820512072.8U CN201820512072U CN208184710U CN 208184710 U CN208184710 U CN 208184710U CN 201820512072 U CN201820512072 U CN 201820512072U CN 208184710 U CN208184710 U CN 208184710U
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Abstract
The utility model is a kind of shearing casing annulus relief valve, including a box cupling, and first step portion is arranged on the outer wall of box cupling, is equipped with the first pilot hole upwards from first step portion, inwardly wears shear pin from the outer wall of each first pilot hole；It is arranged with outer cylinder on the outer wall of box cupling, second step portion is set on the inner wall of outer cylinder, penetrates through the second pilot hole of setting downwards from second step portion to piston hole, the bottom of piston hole is had；Sliding respectively in each piston hole to set spool, spool includes spool main body, and the first guiding axis is arranged in the top of spool main body, and reset spring is arranged on the first guiding axis, and the bottom of spool main body is arranged the second guiding axis, feed pathway is arranged on the second guiding axis.The shearing casing annulus relief valve can carry out automatically release when annular pressure is excessive, while building the pressure when being able to satisfy cementing well again is waited solidifying operation and required, and has the characteristics that structure is simple, easy for installation, helps to realize the safe working of oil/gas well.
Description
Technical field
The utility model relates to petroleum drilling completion technique field more particularly to a kind of shearing casing annulus relief valves.
Background technique
During high temperature high pressure oil gas well liquid loading, radially heat transfer causes wellbore casing, annular fluid thermal expansion to pit shaft,
So that annular fluid pressure rise, increases oil/gas well casing string and well head load.Casing is under higher annular pressure load
Yield failure, unstability buckling may occur, squeeze and the perils such as ruin, once abnormal annular pressure causes down-hole casing column to be on active service
Failure will lead to oil/gas well and have to the well workover that stops production.
If the abnormal high pressure of casing annulus cannot be released effectively, the gas in pit shaft will directly break through annular space sealing device
And discharge into atmospheric environment, seriously pollute atmospheric environment.In marine oil gas well, casing head is to sit to hang under water from level to level
In well head, cannot install the equipments such as relief valve is connected to annular space with external environment, by complete trap after annular fluid expanded by heating
In the wellbore, well workover can only be taken to solve.
In cementing well, due to cement slurry sets weightlessness, pressure in annular space is caused to decline, if annular pressure is less than ground
Stressor layer, then may cause that oil gas is waterborne to alter, and causes interval isolation to alter slot, influences cementing quality, thus usually using build the pressure wait it is solidifying
Improve cement sheath sealing effect.
It is suppressed when therefore needing not only to be able to satisfy the annular pressure demand for reducing jacket exterior annular space, but also being able to satisfy cementing well
Pressure waits solidifying operation required pressure and controls tool.
The present inventor based on years of experience and practice in relevant industries, proposes a kind of shearing casing annulus as a result,
Relief valve, to overcome the deficiencies of existing technologies.
Utility model content
The purpose of this utility model is to provide a kind of shearing casing annulus relief valves, can be when annular pressure is excessive
Building the pressure when carrying out release automatically, while being able to satisfy cementing well again is waited solidifying operation and is required, simple, easy for installation with structure
The characteristics of, help to realize the safe working of oil/gas well.
The purpose of this utility model is achieved in that a kind of shearing casing annulus relief valve, including a box cupling, described
Diameter is set on the outer wall of box cupling in the first step portion for reducing setting, is upwardly extended from the first step portion equipped with multiple
First pilot hole is equipped with shear pin from the outer wall of each first pilot hole radially inward；On the outer wall of the box cupling
Removedly it is arranged with outer cylinder, it is close with the box cupling to be located at the outer wall above the first step portion at the top of the inner wall of the outer cylinder
Envelope is connected, and the lower section setting diameter on the inner wall of the outer cylinder positioned at the first step portion is in second for reducing setting
Rank portion, the second step portion and the first step portion are in interval setting up and down, the first step portion and second described
Constitute fluid cushion chamber between rank portion, the box cupling is located on the outer wall above the second step portion that be disposed radially drain saturating
Hole；It extends downwardly from the second step portion equipped with multiple piston holes, the bottom of each piston hole extends downwardly and penetrates through
Diameter is set in the second pilot hole for reducing setting；
Spool is slidably equipped in each piston hole respectively, the spool includes spool main body, the top of the spool main body
Diameter is set in the first guiding axis for reducing setting, first guiding axis, which can slide, to be arranged in first pilot hole and institute
The top contact of the first guiding axis is stated on the side wall of the shear pin, is arranged with reset spring on first guiding axis；
For the bottom setting diameter of the spool main body in the second guiding axis for reducing setting, second guiding axis, which can slide, is arranged in institute
It states in the second pilot hole, the outer diameter of the spool main body is less than the internal diameter of the piston hole；First guiding axis
On be provided with the apocenosis passage that can be connected to first pilot hole and the fluid cushion chamber, be provided on second guiding axis
The feed pathway of second pilot hole and the piston hole can be connected to.
In a better embodiment of the utility model, between each piston hole and corresponding second pilot hole
The 4th stage portion is constituted, the axial contact of energy is constituted between the spool main body and second guiding axis in the 4th stage portion
On the 5th stage portion.
Diameter reduces downwards first is arranged in a better embodiment of the utility model, in the 4th stage portion
The conical surface, setting and matched second conical surface of first conical surface in the 5th stage portion.
In a better embodiment of the utility model, the top side wall of the outer cylinder and the box cupling are located at described the
Outer wall above one stage portion is fixedly connected by screw.
In a better embodiment of the utility model, at the top of the inner wall of the outer cylinder and the box cupling is located at described the
Sealing ring is equipped between outer wall above one stage portion.
In a better embodiment of the utility model, the top side wall of the outer cylinder is arranged for wearing the screw
Screw via hole.
From the above mentioned, shearing casing annulus relief valve provided by the utility model has the following beneficial effects:
The shearing casing annulus relief valve of the utility model need to carry out building the pressure when waiting solidifying state in cementing well,
Jacket exterior annular fluid acts on the shearing force that the active force on spool is less than shear pin, effect of the spool in reset spring
The second pilot hole of lower closure, the inner cavity of casing and jacket exterior annular space are in dissengaged positions, guarantee inner cavity and the jacket exterior of casing
The pressure difference of annular space ensure that build the pressure and wait the normal operation of solidifying operation；After the completion of well cementation, when external annular space Fluid pressure is excessive, outside
Portion's annular fluid acts on the shearing force that the active force on spool is greater than shear pin, and spool uplink cuts shear pin, casing
Inner cavity be connected to jacket exterior annular space, jacket exterior annular fluid pressure is released, and meets automatically unloading demand；This is practical
Novel shearing casing annulus relief valve, has the characteristics that structure is simple, easy for installation, helps to realize the safety of oil/gas well
Exploitation.
Detailed description of the invention
Following drawings are only intended to schematically illustrate and explain the present invention, does not limit the model of the utility model
It encloses.Wherein:
Fig. 1: for the assembled state schematic diagram of the shearing casing annulus relief valve of the utility model.
Fig. 2: schematic diagram when not cut for shear pin in the shearing casing annulus relief valve of the utility model.
Fig. 3: schematic diagram when being cut for shear pin in the shearing casing annulus relief valve of the utility model.
Fig. 4: for the structural schematic diagram of the box cupling of the utility model.
Fig. 5: for the structural schematic diagram of the outer cylinder of the utility model.
Fig. 6: for the structural schematic diagram of the spool of the utility model.
In figure:
100, shearing casing annulus relief valve；
1, box cupling；
11, first step portion；
12, the first pilot hole；121, pin via hole；
13, drain open-work；
14, sealing ring；
15, the 6th stage portion；
2, outer cylinder；21, second step portion；22, piston hole；23, the second pilot hole；24, screw；
3, shear pin；
4, fluid cushion chamber；
5, spool；
51, spool main body；
52, the first guiding axis；521, apocenosis passage；
53, the second guiding axis；531, feed pathway；
6, reset spring；
91, upper casing；92, setting of casing.
Specific embodiment
For a clearer understanding of the technical features, objectives and effects of the utility model, now compareing Detailed description of the invention
Specific embodiment of the present utility model.
As shown in Figures 1 to 6, the utility model provides a kind of shearing casing annulus relief valve 100；Including a box cupling 1,
The upper inside wall of box cupling 1 is tightly connected upper casing 91, and the inner wall lower of box cupling 1 is tightly connected setting of casing 92, the inner cavity of box cupling 1 with
The inner cavity connection of upper casing 91, setting of casing 92；In a specific embodiment of the utility model, the inner wall of box cupling 1 passes through respectively
Taper thread and upper casing 91, setting of casing 92 are tightly connected；
Diameter is set on the outer wall of box cupling 1 in the first step portion 11 for reducing setting, from the upward (Fig. 1 in first step portion 11
Shown in vertical direction top) extend and be equipped with the first multiple pilot holes 12, radially from the outer wall of each first pilot hole 12
(diametrical direction for radially referring to box cupling 1) is inwardly equipped with shear pin 3；Outer cylinder 2 is removedly arranged on the outer wall of box cupling 1,
The outer wall for being located at 11 top of first step portion at the top of the inner wall of outer cylinder 2 with box cupling 1, which is sealed against, to be connect, and the inner wall of outer cylinder 2 is upper
The second step portion 21 that lower section setting diameter in first step portion 11 is arranged in reduction, second step portion 21 and first step portion
11, in interval setting up and down, constitute stream between first step portion 11, the outer wall of box cupling 1, second step portion 21 and the inner wall of outer cylinder 2
Body cushion chamber 4, box cupling 1, which is located on the outer wall of 21 top of second step portion, is arranged drain open-work 13, and drain open-work 13 can be connected to stream
The inner cavity of body cushion chamber 4 and box cupling 1；It extends downwardly from second step portion 21 equipped with multiple piston holes 22, each piston hole 22
Bottom extends downwardly and penetrates through setting diameter in the second pilot hole 23 for reducing setting；
Spool 5 is slidably equipped in each piston hole 22 respectively, each spool 5 includes spool main body 51, and the top of spool main body 51 is set
Diameter is set in the first guiding axis 52 for reducing setting, the first guiding axis 52, which can slide, is arranged in that the first pilot hole 12 is interior and first leads
To axis 52 top contact on the side wall of shear pin 3, reset spring 6 is arranged on the first guiding axis 52, in this embodiment party
In formula, third stage portion is constituted between the first guiding axis 52 and spool main body 51, the bottom end of reset spring 6 is resisted against third step
In portion, the top of reset spring 6 is resisted against in first step portion 11；The bottom setting diameter of spool main body 51 is in reduction setting
Second guiding axis 53, the second guiding axis 53, which can slide, to be arranged in the second pilot hole 23, and the outer diameter of spool main body 51 is less than
The internal diameter of piston hole 22；The drain that can be connected to the first pilot hole 12 and fluid cushion chamber 4 is provided on first guiding axis 52
Channel 521 is provided with the feed pathway 531 that can be connected to the second pilot hole 23 and piston hole 22 on second guiding axis 53.Drain is logical
The liquid in the first pilot hole 12 can be discharged for road 521, prevent from forming dead space.
Cementing well need to carry out building the pressure when waiting solidifying, and the active force that jacket exterior annular fluid acts on spool, which is less than, to be cut
Cut the shearing force of pin, spool blocks the second pilot hole 23 under the action of reset spring, casing (including upper casing 91 and trap
Pipe 92) inner cavity and jacket exterior annular space be in dissengaged positions, guarantee the inner cavity of casing and the pressure difference of jacket exterior annular space, ensure that
It builds the pressure and waits the normal operation of solidifying operation；After the completion of well cementation, when external annular space Fluid pressure is excessive, external annular space fluid matasomatism is in valve
Active force on core is greater than the shearing force of shear pin, and spool uplink cuts shear pin, the inner cavity of casing and jacket exterior ring
Sky connection, jacket exterior annular fluid pressure are released, and meet automatically unloading demand；The shearing sleeve ring of the utility model
Empty relief valve has the characteristics that structure is simple, easy for installation, helps to realize the safe working of oil/gas well.
Further, as shown in figure 4, penetrating through setting pin via hole 121, shear pin on the lateral wall of each first pilot hole 12
3 insert in the first pilot hole 12 by the way that pin via hole 121 is horizontal.
Further, as shown in Figure 1, Figure 2, shown in Fig. 5, Fig. 6, the is constituted between each piston hole 22 and corresponding second pilot hole 23
Four stage portions constitute the axial contact of energy in the 5th step in the 4th stage portion between spool main body 51 and the second guiding axis 53
Portion.In the present embodiment, first conical surface that reduces downwards of diameter is set in the 4th stage portion, setting and the in the 5th stage portion
Matched second conical surface of one conical surface.When spool 5 is located at extreme lower position under reset spring 6 and gravity, the second conical surface seal
Contact constitutes metallic sealing section on first conical surface, realizes the packing between the inner cavity of casing and external annular space.
Further, as shown in Figure 1, the outer wall that the top side wall of outer cylinder 2 is located at 11 top of first step portion with box cupling 1 passes through
Screw 24 is fixedly connected.In the present embodiment, the screw via hole for wearing screw 24 is arranged in the top side wall of outer cylinder 2.?
In one specific embodiment of the utility model, box cupling 1 is located at setting diameter on the outer wall of 11 top of first step portion and sets in increase
The 6th stage portion 15 set, the top surface contact of outer cylinder 2 is in the 6th stage portion 15.
Further, as shown in Figure 1, being located between the outer wall of 11 top of first step portion at the top of the inner wall of outer cylinder 2 with box cupling 1
Equipped with sealing ring 14.Sealing ring 14 is realized at the top of the inner wall of outer cylinder 2 and box cupling 1 is located between the outer wall of 11 top of first step portion
Sealing.
When shearing casing annulus relief valve 100 assembling of the utility model, each spool 5 is respectively charged into each of outer cylinder 2
In piston hole 22, the second guiding axis 53 of each 5 lower end of spool is inserted into the second pilot hole 23, the second conical surface seal of each spool 5
Each reset spring 6 is sheathed on the first guiding axis 52, the bottom end of reset spring 6 is resisted against third by contact on first conical surface
In stage portion；Sealing ring 14 is sheathed on box cupling 1, shear pin 3 is inserted in into the first pilot hole 12 by the way that pin via hole 121 is horizontal
It is interior；Outer cylinder 2 is set to from bottom to top outside box cupling 1, the first guiding axis 52 of each 5 upper end of spool is aligned with the first pilot hole 12,
Outer cylinder 2 is above pushed away, the top of each reset spring 6 is resisted against in first step portion 11, and with the uplink of outer cylinder 2, reset spring 6 is pressed
Contracting, under the action of reset spring 6, the second conical surface seal contact on spool 5 is on first conical surface；When the first guiding axis 52
For top contact when on the side wall of shear pin 3, outer cylinder 2 stops uplink, and outer cylinder 2 is fixed on box cupling 1 using screw 24.
The shearing casing annulus relief valve 100 of the utility model use process is as follows:
It assembles (as shown in Figure 1) after shearing casing annulus relief valve 100, as shown in Fig. 2, the both ends of box cupling 1 point
It is not tightly connected with upper casing 91, setting of casing 92, the second conical surface seal contact on spool 5 is on first conical surface；By upper casing
91, in 100 tripping in oil gas well shaft of setting of casing 92 and shearing casing annulus relief valve, from casing (upper casing 91 and setting of casing
92) internal injection cement makes cement from annular space outside the bottom sleeve pipe of setting of casing 92, carries out cementing well, table on cement
Face is lower than shearing casing annulus relief valve 100.
To guarantee cementing quality, jacket exterior applied pressure by annulus about 5MPa is given at well head, build the pressure and waits solidifying operation, at this time
Jacket exterior annular fluid pressure is greater than the chamber pressure of casing, and under inside and outside differential pressure effect, spool 5 has the tendency that uplink, but
Jacket exterior annular fluid acts on the shearing force that the active force on spool is less than shear pin, can not cut shear pin 3, valve
Core 5 blocks the second pilot hole under the action of reset spring, and the inner cavity of casing and jacket exterior annular space are in dissengaged positions, ensure that
It builds the pressure and waits solidifying normal operation；
When oil/gas well produces, radially heat transfer causes the raising of jacket exterior annular space temperature to cause bulking effect to pit shaft, leads to oil
The heated pressurization (prior art) of annular fluid in Wellbore of Gas Wells, i.e. jacket exterior annular fluid pressure increase.When jacket exterior ring
When empty Fluid pressure is greater than annular space Fluid pressure in pit shaft, hydraulic pressure difference acts on spool 5, has the tendency that pushing 5 uplink of spool,
Shear pin 3 limits 5 uplink of spool.As shown in figure 3, as jacket exterior annular fluid pressure further increases, external annular space
Fluid matasomatism is greater than the shearing force of shear pin 3 in the active force on spool 5, and 5 uplink of spool cuts shear pin 3, resets bullet
Spring 6 is further compressed.
When the second guiding axis 53, which goes upward to feed pathway 531, is connected to the second pilot hole 23 and piston hole 22, jacket exterior
The high-pressure fluid of annular space flows into the inner cavity of casing from the second pilot hole 23, piston hole 22, fluid cushion chamber 4 and drain open-work 13,
The high-pressure fluid of jacket exterior annular space is discharged, and reduces jacket exterior annular fluid pressure, realizes the automatic of jacket exterior annular space
Release.
When jacket exterior annular fluid pressure declines, the active force of jacket exterior annular fluid suffered by spool 5 is less than multiple
Position spring 6 is when acting on active force on spool 5, and reset spring 6 pushes back spool 5, spool 5 come downwards to the second conical surface seal contact in
On first conical surface, pressure release terminates.
From the above mentioned, shearing casing annulus relief valve provided by the utility model has the following beneficial effects:
The shearing casing annulus relief valve of the utility model need to carry out building the pressure when waiting solidifying state in cementing well,
Jacket exterior annular fluid acts on the shearing force that the active force on spool is less than shear pin, effect of the spool in reset spring
The second pilot hole of lower closure, the inner cavity of casing and jacket exterior annular space are in dissengaged positions, guarantee inner cavity and the jacket exterior of casing
The pressure difference of annular space ensure that build the pressure and wait the normal operation of solidifying operation；After the completion of well cementation, when external annular space Fluid pressure is excessive, outside
Portion's annular fluid acts on the shearing force that the active force on spool is greater than shear pin, and spool uplink cuts shear pin, casing
Inner cavity be connected to jacket exterior annular space, jacket exterior annular fluid pressure is released, and meets automatically unloading demand；This is practical
Novel shearing casing annulus relief valve, has the characteristics that structure is simple, easy for installation, helps to realize the safety of oil/gas well
Exploitation.
The above descriptions are merely exemplary embodiments of the present utility model, the model being not intended to limit the utility model
It encloses.Any those skilled in the art, made equivalent change under the premise of not departing from the conceptions and principles of the utility model
Change and modify, should belong to the range of the utility model protection.
Claims (6)
1. a kind of shearing casing annulus relief valve, including a box cupling, which is characterized in that diameter is arranged on the outer wall of the box cupling
It in the first step portion for reducing setting, upwardly extends from the first step portion equipped with the first multiple pilot holes, from each described
The outer wall of first pilot hole is equipped with shear pin radially inward；It is removedly arranged with outer cylinder on the outer wall of the box cupling,
With the box cupling it is located at the outer wall above the first step portion at the top of the inner wall of the outer cylinder and is sealed against and connect, the outer cylinder
Inner wall on be located at the first step portion lower section setting diameter in reduce setting second step portion, the second step portion
With the first step portion in interval setting up and down, fluid cushion is constituted between the first step portion and the second step portion
Chamber, the box cupling, which is located on the outer wall above the second step portion, is disposed radially drain open-work；From the second step portion
It extends downwardly and is equipped with multiple piston holes, the bottom of each piston hole extends downwardly and penetrates through setting diameter in reduction setting
Second pilot hole；
Spool is slidably equipped in each piston hole respectively, the spool includes spool main body, the top setting of the spool main body
In the first guiding axis for reducing setting, first guiding axis can slide to be arranged in first pilot hole and described the diameter
The top contact of one guiding axis is arranged with reset spring on first guiding axis on the side wall of the shear pin；It is described
For the bottom setting diameter of spool main body in the second guiding axis for reducing setting, second guiding axis, which can slide, is arranged in described the
In two pilot holes, the outer diameter of the spool main body is less than the internal diameter of the piston hole；It is set on first guiding axis
It is equipped with the apocenosis passage that can be connected to first pilot hole and the fluid cushion chamber, being provided on second guiding axis can connect
Lead to the feed pathway of second pilot hole and the piston hole.
2. shearing casing annulus relief valve as described in claim 1, which is characterized in that each piston hole and corresponding institute
The 4th stage portion of composition between the second pilot hole is stated, constituting between the spool main body and second guiding axis can axial contact
The 5th stage portion in the 4th stage portion.
3. shearing casing annulus relief valve as claimed in claim 2, which is characterized in that be arranged in the 4th stage portion straight
First conical surface that diameter reduces downwards, setting and matched second conical surface of first conical surface in the 5th stage portion.
4. shearing casing annulus relief valve as described in claim 1, which is characterized in that the top side wall of the outer cylinder and institute
The outer wall that box cupling is located above the first step portion is stated to be fixedly connected by screw.
5. shearing casing annulus relief valve as claimed in claim 4, which is characterized in that the inner wall top of the outer cylinder and institute
It states and is equipped with sealing ring between the outer wall that box cupling is located above the first step portion.
6. shearing casing annulus relief valve as claimed in claim 4, which is characterized in that the top side wall of the outer cylinder is arranged
For wearing the screw via hole of the screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820512072.8U CN208184710U (en) | 2018-04-11 | 2018-04-11 | Shearing casing annulus relief valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820512072.8U CN208184710U (en) | 2018-04-11 | 2018-04-11 | Shearing casing annulus relief valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208184710U true CN208184710U (en) | 2018-12-04 |
Family
ID=64437041
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820512072.8U Active CN208184710U (en) | 2018-04-11 | 2018-04-11 | Shearing casing annulus relief valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208184710U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114961643A (en) * | 2022-06-01 | 2022-08-30 | 西南石油大学 | Recoverable pressure relief device and method for releasing annular trapped pressure of sleeve |
| CN116163673A (en) * | 2023-04-25 | 2023-05-26 | 中国石油大学(华东) | Micro-pressure control device and method for deep water shallow gradient well cementation circulating wellhead |
-
2018
- 2018-04-11 CN CN201820512072.8U patent/CN208184710U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114961643A (en) * | 2022-06-01 | 2022-08-30 | 西南石油大学 | Recoverable pressure relief device and method for releasing annular trapped pressure of sleeve |
| CN116163673A (en) * | 2023-04-25 | 2023-05-26 | 中国石油大学(华东) | Micro-pressure control device and method for deep water shallow gradient well cementation circulating wellhead |
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