CN206448795U - Packing element, packer and bridging plug with metallic packing ring - Google Patents
Packing element, packer and bridging plug with metallic packing ring Download PDFInfo
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- CN206448795U CN206448795U CN201621433135.8U CN201621433135U CN206448795U CN 206448795 U CN206448795 U CN 206448795U CN 201621433135 U CN201621433135 U CN 201621433135U CN 206448795 U CN206448795 U CN 206448795U
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- 238000007789 sealing Methods 0.000 claims abstract description 124
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 37
- 229910002804 graphite Inorganic materials 0.000 claims description 37
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Abstract
The application is related to the packing element with metallic packing ring, packer and the bridging plug used in field of sealing technology, more particularly to a kind of oil exploitation industry.Metallic packing ring includes metal spring, inner metal ring, outside becket.It is used to directly bear the first axial compressive force in the upper surface of the metallic packing ring of upper end, it is used to directly bear the second axial compressive force in the lower surface of the metallic packing ring of lower end, each metallic packing ring in radial direction can be deformed upon to fit respectively with central tube and sleeve pipe in the presence of axial compressive force.Its internal metal spring is axially compressed and extended to radial direction, and then metal spring drives inner metal ring and outside becket to extend in radial direction, when elongation is sufficiently large, the inner surface of outside becket fits with central tube, the outer surface of outside becket fits with sleeve pipe, so as to play a part of anti-shoulder.
Description
Technical field
The application be related to use in field of sealing technology, more particularly to a kind of oil exploitation industry there is metallic packing ring
Packing element, packer and bridging plug.
Background technology
Packer is a kind of key tool that oil field well recovers the oil, and is widely used in oil field dispensing, separate zone stimulation, layering and adopts
The several work such as oil, mechanical pipe water blockoff, packer needs to carry out the packing of annular space, to realize that oil gas is layered, and realizes annular space
The core component of packing is packing element.Bridging plug is also a kind of instrument of oil gas layering generally used in oil extraction operation.Packer and
The main distinction of bridging plug is, packer be usually pressure break, be acidified, look for the measure such as Lou to construct when staying in well temporarily, and bridge
Plug is temporarily or permanently to be stayed in measures such as sealing oil recoveries in well.Packer and central tube stay well simultaneously, mix that give up can
Individually to stay well, and bridging plug is then individually to stay well.Structurally, packer is hollow structure, can flow freely oil gas water,
And in bridging plug it is then solid construction.
As the instrument of Oil-gas Separation, packer and bridging plug are required for packing element, and packing element is used as sealed critical component, its matter
Amount directly affects the sealing effectiveness and service life of packer and bridging plug, and conclusive effect is played in packer and bridging plug.
Packing element is typically made of rubber type of material, therefore referred to as packing element.But packing element is only the technology art that agreement becomes social custom in a kind of industry
Language, the functional parts of sealing function are played for expression, and referring not only to packing element can only be made by rubber.When packing element bears one
Fixed pressure come promote its deformation be used for seal when, it is necessary to the deformability of packing element in itself be considered, if deformation deficiency can cause it
Sealing function can not be played；If deformation is excessive, packing element may be caused to be failed because of conquassation, lose recovery capability.Most of all,
When packing element is acted in underground by high-temperature steam, packing element is more that failing causes to lose by effect while HTHP
Go recovery capability.
9th phase in 2002《Petroleum machinery》Disclose《Packer compresses packing element " protrusion-dispelling " new construction》, wherein recording
Following content：" so-called protrusion-dispelling, exactly lays certain blocker ring, support member, limits device and guard member etc. in packing element end, uses
Packing element is protruded or flowed towards oil sets annular space when preventing and limiting packer setting "." because anti-lug structure is for covering
Annular gap between packer and sleeve pipe, during packer setting, once packing element deformation is contacted with casing wall, under load effect outside,
The outburst prevention device just unfolded annular space covered between packer and casing wall, prevents packing element towards prominent in this annular space, forces the packing element to be in
Respectively to uniform compression, the higher contact stress of packing element is produced and keeps, so as to obtain good sealing "." ... mainly have
Copper bowl curing type and two kinds of steel mesh or steel band curing type.The former is that the thick copper bowls of two 2mm are solidificated in into two end packing elements respectively
On certain end face, the latter is that thick 1mm or so steel mesh or steel band are solidificated on two end packing element end faces respectively ".
2013 first-phase《Oil field equipment》Disclose《Packer rubber barrel structure is improved and benefit analysis》Text
Chapter, wherein recording herein below：" string has 3 packing elements on conventional packer, is divided into the packing element physical dimension of upper, middle and lower 3
Identical and upper lower rubber cylinder is that long packing element type, middle packing element are 2 kinds of structure types of short rubber cylinder.Sent out by the research to traditional three packing elements structure
Existing, play main seal is upper packing element ".Also, carry out non-linear point by non linear finite element analysis software Abaqus
Analysis is drawn：" as axial load increases, axial compression amount also increases, and decrement increase is more apparent during beginning, and subsequent decrement increases
Slow down greatly, packing element deformation tends towards stability；With the increase of setting force, packing element gradually increases with casing-contact length.Packing element appearance
Cylinder partial limited radial deformation system, packing element inner surface deformation outward bulge as appearance, when load increase, packing element is crushed
And be compacted finally.But due to structure limitation, only upper packing element can be compacted.When operating pressure is 30MPa, upper packing element base
There is slight shoulder in this completely densified, packing element upper end, but packing element does not occur isolates phenomenon, and shoulder is within allowed band ".
The first phase in 2009《Oil field equipment》In《The improvement of high-pressure packer cartridge》In think " due to rubber
Glue top layer is easily torn, therefore considers to add layer of metal piece (such as copper sheet) on the top layer of rubber ".
But, above-mentioned prior art only analyzes the first axial compressive force of application (equivalent to " axial load ") to packing element deformation
Influence.But, it is necessary to apply top-down first axial compressive force first to packing element to make glue in actual production process
Cylinder produces preliminary sealing, and then apply can (material such as downhole gas be to packing element by the second axial compressive force from bottom to top for packing element
Impact).According to the experiment of inventor, when the first axial compressive force is 30MPa, inventor has found that almost all of packing element all can
There is shoulder, when further applying a second axial pressure (such as 15MPa or 20MPa), all packing elements can be at shoulder
Generation is isolated, and causes seal failure.
Further, inventor also found, the sealing that packing element can be of short duration when pressure is applied a second axial, but well
When the materials such as spirit body impact to packing element, the small molecule of the high temperature and high pressure steam being contained therein can be to the packing element of high polymer material
Degradation is produced, causes packing element to be followed the string first in bottom and sealing function can not be played, and then in the centre of packing element
Portion also produces degraded and followed the string, and influences the sealed long-term effect of packing element.
Utility model content
The purpose of the application is to provide a kind of new sealing structure, to prevent or reduce the generation of packing element shoulder.
According to the one side of the application there is provided a kind of packing element with metallic packing ring, the packing element is with being located at
The through hole of the heart, the inner surface positioned at the through hole, the outer surface corresponding with the inner surface, respectively be located at the packing element two
The upper and lower end at end and the pars intermedia between the upper end and the bottom, the upper end are used to hold
By the first axial compressive force in axial direction, the bottom is used to bear axially to press with described first along the axial direction
The second opposite axial compressive force of power a, metallic packing ring for being located at upper end serves as the upper end, under another is located at
The metallic packing ring at end serves as the bottom, and the metallic packing ring includes：
The identical and end to end metal spring of thickness；
The inner metal ring of closure, is coated on the outside of the metal spring；
The outside becket of closure, is coated on the outside of the inner metal ring, and the hardness of the outside becket is less than
The hardness of the inner metal ring；
It is used to directly bear first axial compressive force in the upper surface of the metallic packing ring of upper end, the institute in lower end
Stating the lower surface of metallic packing ring is used to directly bear second axial compressive force, and each metallic packing ring can be in axial compressive force
In the presence of deform upon to fit respectively with central tube and sleeve pipe in radial direction.
Preferably, full inside the inner metal ring to have colloid, the metal spring is placed in the colloid.
Preferably, the cross section of the inner metal ring and the outside becket is square.
Preferably, the cross section of the outside becket for circle, the outside becket by hard gasket with it is described
Pars intermedia mediate contact.
Preferably, the pars intermedia be included in axial direction arrangement more than one wire sealing ring and one
Filament sealing ring above, one of those described wire sealing ring is with one of those described filament sealing ring in institute
State lower section that is inconsistent on axial direction and being arranged on the filament sealing ring；
The wire sealing ring includes cross one another many one metal wires and each wire bonds together
The colloid；
The plurality of fibers silk of the filament sealing ring including cross one another high temperature high voltage resistant and by each fiber
The colloid that silk bonds together；
The overall hardness of the metallic packing ring is more than the overall hardness of the wire sealing ring, the wire sealing
The overall hardness of ring is more than the overall hardness of the filament sealing ring.
Preferably, the first graphite linings are coated outside the wire sealing ring, first graphite linings at least coat described
The lateral surface of wire sealing ring；
The second graphite linings are coated outside the filament sealing ring, it is close that second graphite linings at least coat the filament
The lateral surface of seal ring.
Preferably, first graphite linings coat the lateral surface of the wire sealing ring, upper surface and lower surface, institute
State the second graphite linings and coat the lateral surface of the filament sealing ring, upper surface and lower surface；Or
First graphite linings coat the lateral surface, medial surface, upper surface and lower surface, institute of the wire sealing ring
State lateral surface, medial surface, upper surface and lower surface that the second graphite linings coat the filament sealing ring.
Preferably, the outside of first graphite linings and second graphite linings is coated with protective layer, the protective layer
It is destroyed in high temperature and liquefies or be cured as slag.
According to further aspect of the application there is provided a kind of packer, the packer has one of above-mentioned technical proposal institute
The packing element of restriction.
According to another aspect of the application there is provided a kind of bridging plug, there is the bridging plug one of above-mentioned technical proposal to be limited
Packing element.
The technical scheme that the application is provided at least has the following technical effect that：
1st, in one embodiment, metallic packing ring is arranged on upper and lower ends, when axial compressive force puts on metallic packing ring
When, its internal metal spring is axially compressed and extended to radial direction, and then metal spring drives inner metal ring and outer
Side becket extends in radial direction, and when elongation is sufficiently large, inner surface and the central tube of outside becket fit, outside
The outer surface of becket fits with sleeve pipe, so as to play a part of anti-shoulder.
2nd, in one embodiment, metal spring thickness is identical and end to end, so that metal when by axial compressive force
Spring can equably apply outside active force to inner side becket, promote the outer surface of outside becket uniform in radial direction
Ground stretches out and inner surface equably extends internally in radial direction, it is ensured that the patch of outside becket and central tube and sleeve pipe
It is right, improve anti-shoulder effect.Moreover, metal spring can shrink after axial compressive force disappearance in radial direction, contribute to outer
Side becket off center is managed and sleeve pipe goes out packing element from sleeve pipe.
3rd, in one embodiment, it is full inside inner metal ring to have colloid.Although colloid compression when alteration of form but
Constancy of volume, colloid equably can apply outwards to inner side becket so when metallic packing ring is being compressed by axial compressive force
Active force, promote outside becket outer surface radial direction equably stretch out and inner surface in radial direction equably
Extend internally.Similarly, colloid can shrink after axial compressive force disappearance in radial direction, contribute to outside becket off center
Pipe and sleeve pipe go out packing element from sleeve pipe.
4th, in one embodiment, the hardness of outside becket is less than the hardness of inner metal ring, so contributes to outside
Becket is more closely fitted with central tube and sleeve pipe., can be very and the hardness of inner metal ring is more than the hardness of outside becket
It is good to play a part of preventing shoulder.
5th, in one embodiment, the overall hardness of metallic packing ring is more than wire sealing ring and filament sealing ring is whole
The hardness of body, so when packing element is by the first axial compressive force, wire sealing ring and filament sealing ring radial direction deformation are larger,
It can make the sealing of packing element using less first axial compressive force.Continue to increase by the first axial compressive force or further apply the second axle
To pressure, the surfaces externally and internally of wire sealing ring fits with central tube and sleeve pipe respectively, plays a part of anti-shoulder.
6th, the wire sealing ring of the application is arranged on the lower section of a filament sealing ring, and wire sealing ring exists
With can reduce after central tube and casing-contact because of the friction with central tube and sleeve pipe pass to filament sealing ring from lower
On the second axial compressive force.A big chunk reason produced in view of shoulder, which is that, passes to the second of filament sealing ring
Axial compressive force is excessive, so this design can reduce or prevent the generation of shoulder.
7th, in one embodiment, in order to prevent corruption of the high temperature and high pressure steam to the degraded or other gases of packing element to packing element
Erosion, it is necessary to packing element contact with downhole gas place all coated graphite layer come prevent or reduces corrode and degraded, but in order to
The generation of shoulder is prevented, it is necessary to which the upper and lower end parts of packing element are not to be afraid of the metal of corrosion and degraded.So the application is only to centre
Portion's coated graphite layer, the packing element of this spline structure can either prevent the generation of shoulder, can prevent packing element from making in long-time again
Used time occurs degraded and corroded.
Brief description of the drawings
Some specific embodiments of the application are described in detail by way of example, and not by way of limitation with reference to the accompanying drawings hereinafter.
Identical reference denotes same or similar part or part in accompanying drawing.In accompanying drawing：
Fig. 1 is the compression packer comprising packing element and central tube and the position relationship of sleeve pipe of the application one embodiment
Schematic diagram；
Fig. 2 is the structural representation of a packing element in the prior art；
Fig. 3 is the position relationship schematic diagram of the packing element and central tube and sleeve pipe of the application one embodiment, wherein only showing
A part of packing element, central tube and sleeve pipe；
Fig. 4 shows that the packing element shown in Fig. 3 is applied in the shoulder knot produced after the first axial compressive force or the second axial compressive force
Structure schematic diagram；
Fig. 5 is the structural representation of the metallic packing ring of the application one embodiment；
Fig. 6 is the structural representation of the metal spring of the application one embodiment；
Fig. 7 is the position relationship schematic diagram of packing element and central tube and sleeve pipe with metallic packing ring shown in Fig. 5, wherein only
Show a part of packing element, central tube and sleeve pipe；
Fig. 8 is the structural representation of the application one embodiment filament sealing ring.
Reference in figure is as follows：
10- packing elements, 101- outer surfaces, 102- inner surfaces, 103- through holes, 104- upper ends, 105- pars intermedias, 106- lower ends
Portion, 107- shoulders；
108- matrixes, 109- colloids, the graphite linings of 114- second；
30- central tubes；
40- sleeve pipes；
50- rigidity spacer rings；
60- hard gaskets；
Gold on the inside of 71- wire sealing rings, 72- filament sealing rings, 73- metallic packing rings, 731- metal springs, 732-
Belong to becket on the outside of ring, 733-；
200- compression packers；
300- thermal production well mouths；
The axial directions of A- first；
The axial directions of B- second；
F1- the first axial compressive force；
F2- the second axial compressive force.
Embodiment
Direction described below " on ", " under " it is to be used as using Fig. 2 with reference to narration.
Compression packer 200 as shown in Figure 1 has the packing element 10 of the application.During compression packer 200 is connected to
It is placed on heart pipe 30 in sleeve pipe 40.Compression packer 200 needs that different oil reservoirs, water layer are separated and held in the wellbore
By certain pressure difference, it is desirable to can descend pit shaft precalculated position, packing is tight, can have durability in underground again, it is necessary to when can be smooth
Rise.
As shown in Fig. 2 the generally tubular of packing element 10, packing element 10 has the through hole 103 positioned at center, the through hole 103 is by interior
Surface 102 limits and formed, and outer surface 101 is located at the outside of the through hole 103 corresponding with inner surface 102.When the first axial direction
Pressure F1The axial compressive force F of upper end 104 or second is acted on along the first axial direction A2Lower end is acted on along the second axial direction B
During portion 106, the entirety of packing element 10 will be axially compressed and be radially expanded (has identical with " in deforming upon for radial direction "
Implication), promote the outwardly convex of outer surface 101 and inner surface 102 be inwardly protruding.
As shown in figure 3, packing element 10 is located in the annular space that sleeve pipe 40 and central tube 30 are constituted, rigid spacer ring 50 is in axial direction
The first axial compressive force F of (i.e. the first axial direction A) from top to bottom is provided on direction1, can also remove in other embodiments
Rigid spacer ring 50 and by the first axial compressive force F can be applied to packing element 101Other parts replace.Upper end 104 is used for direct
Bear the first axial compressive force F in axial direction1, bottom 106 be used for directly bear in axial direction with first axially press
Power F1The second opposite axial compressive force F2.As a part for packing element 10, upper end 104, bottom 106 and pars intermedia 105 all should
This is flexible.As a kind of explanation to elasticity and the restriction of elastic size, as the first axial compressive force F1Put on upper end
When 104, upper end 104, pars intermedia 105 and bottom 106 are deformed upon in radial direction；As the second axial compressive force F2Apply
When bottom 106, upper end 104, pars intermedia 105 and bottom 106 are deformed upon in radial direction.Applying first axle
To pressure F1Afterwards or applying a second axial pressure F2Afterwards, inner surface 102 is sealed with central tube 30, outer surface 101 and sleeve pipe 40
Sealing.Usually, the space between inner surface 102 and central tube 30 is smaller (almost bonded to each other), and outer surface 101 and sleeve pipe
Gap between 40 is larger, and central tube 30 and sleeve pipe 40 are respectively by inner surface 102 and the maximum raised size of outer surface 101
It is defined, so causing the degree of the outwardly convex of outer surface 101 to be more than the inwardly protruded degree of inner surface 102.In Fig. 3 institutes
In illustrated embodiment, upper end 104 and bottom 106 are respectively provided with hypotenuse, and the hypotenuse can also be not provided with other embodiments.
As shown in figure 4, when upper end 104 is by the first axial compressive force F1When, upper end 104 can produce very big shoulder
107, when applying a second axial pressure F again2When, upper end 104 is understood isolates at shoulder 107 in figure 3.Or, upper end
Although portion 104 is by the first axial compressive force F1When do not produce shoulder 107, but pressure F ought be applied a second axial again2When produce shoulder
Prominent 107, acted on by material ductility and the rigid shearing of spacer ring 50, shoulder 107 is very easy to isolate.
Below the structure design of shoulder 107 is reduced or prevents to describe the application.
The upper end 104 of packing element 10 is served as using a metallic packing ring 73, the metal for being located at lower end using another is close
Seal ring 73 serves as bottom 106, as shown in figure 5, the metallic packing ring 73 include metal spring 731, inner metal ring 732,
Outside becket 733.Metal spring 731 is as shown in fig. 6, the thickness of metal spring 731 is identical and end to end.Inner metal ring
732 be a closing structure, and inner metal ring 732 is coated on the outside of metal spring 731.Outside becket 733 is also one
Closing structure, outside becket 733 is coated on the outside of inner metal ring 732.
From figure 7 it can be seen that being used to directly bear the first axial compressive force F in the upper surface of the metallic packing ring 73 of upper end1,
It is used to directly bear the second axial compressive force F in the lower surface of the metallic packing ring 73 of lower end2, the metallic packing ring 73 of upper and lower ends
In radial direction it can deform upon to fit respectively with central tube 30 and sleeve pipe 40 in the presence of axial compressive force.Specifically, it is golden
Belong to the upper and lower ends that sealing ring 73 is located at packing element 10, when axial compressive force puts on metallic packing ring 73, its internal metal elastic
Spring 731 is axially compressed and extended to radial direction, and then metal spring 731 drives inner metal ring 732 and outside becket
733 in radial direction extension, and when elongation is sufficiently large, inner surface and the central tube 30 of outside becket 733 fit, outside
The outer surface of becket 733 fits with sleeve pipe 40, so as to play a part of anti-shoulder.
According to embodiments herein, the hardness of outside becket 733 is less than the hardness of inner metal ring 732.On the one hand,
This kind design, which contributes to outside becket 733 more closely to be fitted with central tube 30 and sleeve pipe 40, makes metallic packing ring 73 play one
Fixed sealing function.On the other hand, due to harder the bearing main anti-shoulder of the task of inner metal ring 732, thus
The hardness of inner metal ring 732 can be only improved as needed to reach more preferable anti-shoulder effect.
In the embodiment shown in fig. 5, outside becket 733 is copper material, can also be in other embodiments silver-colored material,
And inner metal ring 722 is inconel 600, metal spring is inconel 750.Or in other embodiments, it is interior
Side becket and metal spring are selected as stainless steel alloy.The outside becket 733 of lower end is that metal material can be effectively
The bottom 106 contacted with downhole gas is prevented to be corroded.
As shown in figure 5, as a kind of more excellent design, the inside of inner metal ring 732 is full colloid 109, metal spring
731 are placed in colloid 109.Although colloid 109 alteration of form but constancy of volume in compression, this, which causes to fill, colloid 109
The Volume Changes very little in compression of inner metal ring 732, contributes to inner metal ring 732 and outside becket 733 to occur radially
Deformation.Also, colloid 109 equably can apply to inner side becket 732 when metallic packing ring 73 is being compressed by axial compressive force
Outside active force, promote outside becket 733 outer surface radial direction equably stretch out and inner surface radially
Direction equably extends internally.Similarly, colloid 109 can shrink after axial compressive force disappearance in radial direction, contribute to outside
The off center pipe 30 of becket 733 and sleeve pipe 40 go out packing element 10 from sleeve pipe 40.
In one embodiment, the cross section of outside becket 733 is the horizontal stroke of square, correspondingly inner metal ring 732
Section is also square.That is, outside becket 733 and inner metal ring 732 are the circle that cross section is square
Becket.Reference picture 7 can be deduced, and now there is essentially identical gap the outer surface of outside becket 733 with central tube 30,
The inner surface of outside becket 733 also has essentially identical gap with sleeve pipe 40, adds the outside after axial compressive force is born
Becket 733 and sleeve pipe 40 and the fitting area of central tube 30, add the sealing effectiveness of outside becket 733.Similarly, on
The cross section of the inner metal ring 732 at end is square, will improve the upward extruding of wire sealing ring 71 adjacent thereto and makees
With improving the effect of anti-shoulder.
But in Fig. 5 and embodiment illustrated in fig. 7, the cross section of outside becket 733 is circle, now outside becket
733 be linear contact lay with wire sealing ring 71, and to prevent wire sealing ring 71 from tilting, outside becket 733 passes through hard pad
Piece 60 and the mediate contact of wire sealing ring 71.
As shown in fig. 7, the pars intermedia 105 of packing element 10 includes the two wire sealing rings 71 and one arranged in the axial direction
Individual filament sealing ring 72.Certainly, in other embodiments, a wire sealing ring 71 and a fiber can also be only set
Silk sealing ring 72 or more wire sealing ring 71 and filament sealing ring 72.In the figure 7, two 71 points of wire sealing rings
Inconsistent and lower end wire sealing ring 71 is not arranged on filament sealing in the axial direction with filament sealing ring 72
The lower section of ring 72.Wire sealing ring 71 can be because passing to fiber after being contacted with central tube 30 and sleeve pipe 40 with reducing friction
The second axial compressive force from bottom to top of silk sealing ring 72.A big chunk reason produced in view of shoulder, which is that, to be passed to
Second axial compressive force of filament sealing ring 72 is excessive, so this design can reduce or prevent the generation of shoulder.
In this application, wire sealing ring 71 includes cross one another many one metal wires and is bonded in each wire
Colloid 109 together.In this application, the plurality of fibers silk of filament sealing ring 72 including cross one another high temperature high voltage resistant with
And the colloid 109 that each filament bonds together.In fig. 8, plurality of fibers silk is represented using matrix 108, colloid 109 oozes
Thoroughly in plurality of fibers silk.In fig. 8, for the clear needs in structure, it illustrate only and be coated on all surface of matrix 108
Colloid 109, and the not shown colloid 109 penetrated into inside matrix 108.As an explanation to surface herein, for example, work as matrix
When circle is in 108 cross section, colloid 109 is located on the periphery of matrix 108.Matrix 108 by many high temperature high voltage resistants fibre
Dimension silk is polymerized, the material of other high temperature high voltage resistants such as filament can be glass fibre or carbon fiber.At one
In embodiment, each filament longitude and latitude is woven together and forms matrix 108, it is other be that each filament may be used also in embodiment
Matrix 108 is formed to be otherwise woven together.The overall hardness of metallic packing ring 73 is more than wire sealing ring 71
Overall hardness, the overall hardness of wire sealing ring 71 is more than the overall hardness of filament sealing ring 72.In packing element by axle
During to pressure, wire sealing ring 71 and the radial direction deformation of filament sealing ring 72 are larger, can be made using less axial compressive force
Packing element 10 is sealed.Continue to increase by the first axial compressive force or further apply a second axial pressure, wire sealing ring 71 it is inside and outside
Surface fits with central tube 30 and sleeve pipe 40 respectively, plays a part of anti-shoulder.
The hardness of metallic packing ring 73 is set greater than the hardness of wire sealing ring 71 by the application, so by phase
With the first axial compressive force F of size1During effect, metallic packing ring 73 is smaller in the deformation of radial direction, it is accordingly required in particular to attention
Be, correspondingly metallic packing ring 73 because shoulder 107 formed by radial deformation it is also smaller.Less shoulder 107 can be effectively
Prevent packing element 10 from isolating, having reached prevents the effect of the seal failure of packing element 10.Similarly, the hardness of wire sealing ring 71 is more than
The hardness of filament sealing ring 72, also effectively can prevent the generation of shoulder.
Inventor passes through test of many times, it is found that existing filament can be broken in the presence of 22Mpa pulling force, therefore
The filament sealing ring 72 that filament is made also is easy to be broken under the effect of 22Mpa axial compressive forces.Therefore person is invented
Select and used wire sealing ring 71.But the adhesive of wire and colloid is less than the adhesive of filament and colloid, if rising
The part of sealing function is all using wire sealing ring 71, then the colloid under high pressure effect in wire sealing ring 71 very may be used
It can come off, cause packing element 10 not seal, so the application uses wire sealing ring 71 with the pairing of filament sealing ring 72.
The reason for wire sealing ring 71 is arranged on the lower section of filament sealing ring 72 is that inventor has found generation and the shoulder of shoulder
Prominent rupture is more to occur to be applied in the second axial compressive force F from bottom to top in packing element 102When, when wire sealing ring 71
When being arranged on the lower section of filament sealing ring 72, wire sealing ring 71 can subtract because of the friction with central tube 30 and/or sleeve pipe 40
The small axial compressive force for passing to filament sealing ring 72, now can effectively reduce the axial direction pressure that filament sealing ring 72 is subject to
Power, and shoulder Producing reason is that axial compressive force is excessive, so this design can reduce or prevent the generation of shoulder.Separately
Outer wire sealing ring 71 is made up of wire and colloid, by the first axial compressive force F1When, its inner and outer wall base
Contacted respectively with central tube 30 and sleeve pipe 40 in sheet, so in the annular space that central tube 30 and sleeve pipe 40 are constituted, gold
Belong to silk sealing ring 71 to be put on substantially with annular space cross section identical area on filament sealing ring 72, along with metal
Silk sealing ring 71 compares the characteristic of the anti-shoulder structurally flexible of simple metal, and wire sealing ring 71 will not be produced to filament sealing ring 72
Life is isolated.
Graphite has good anticorrosion ability, therefore the first graphite linings at least coat the lateral surface of wire sealing ring 71,
The lateral surface of second graphite linings 114 at least covered fiber silk sealing ring 72.In one embodiment, the first graphite linings cladding metal
The silk lateral surface of sealing ring 71, upper surface and lower surface and medial surface that uncoated downhole gas is relatively inaccessible to, the second graphite
The lateral surface of layer 114 covered fibers silk sealing ring 72, the equally not uncoated downhole gas of upper surface and lower surface are relatively inaccessible to
Medial surface.Most preferably, the lateral surface of the first graphite linings cladding wire sealing ring 71, medial surface, upper surface and lower surface,
The lateral surface of the covered fiber of second graphite linings 114 silk sealing ring 72, medial surface, upper surface and lower surface.Implementing shown in Fig. 8
In example, the second graphite linings 114 are distributed in the lateral surface of filament sealing ring 72 and medial surface.In a preferred embodiment, second
Graphite linings 114 are only distributed in the lateral surface of filament sealing ring 72, this be due to inner surface 102 described above with central tube 30 it
Between space it is smaller (almost bonded to each other), and the gap between outer surface 101 and sleeve pipe 40 is larger, so filament sealing ring
72 medial surface is easier to seal with central tube 30, and the outer surface of filament sealing ring 72 is likely to have between sleeve pipe 40
Very small gap, and other gases such as steam of HTHP can be constantly small by these after the sealing of packing element 10
Gap is produced to packing element 10 corrodes and degrades.In other embodiments, the second graphite linings 114 covered fibers silk sealing ring 72
Lateral surface, upper surface and lower surface.Although the second graphite linings 114 are resistant to high temperature and high pressure, it easily tears and crushed,
So second graphite linings 114 are externally coated with protective layer in this application, the effect of the protective layer, which is only that, reaches underground
During or during transport prevent the second graphite linings 114 from damaging, such as protective layer can be common glue
Solidification is formed or vinyon layer, and these protective layers can't produce positive effect to the sealing of packing element 10, and can be
It is destroyed during high temperature and liquefies or be cured as slag.First graphite linings are distributed in the position of wire sealing ring 71 and the guarantor of outside
Sheath is similar, and here is omitted.
The application also provides a kind of packer, and the packer has the packing element 10 that one of above-mentioned technical proposal is limited.
The application also provides a kind of bridging plug, and the bridging plug has the packing element 10 that one of above-mentioned technical proposal is limited.
So far, although those skilled in the art will appreciate that detailed herein have shown and described the multiple of the application and show
Example property embodiment, still, still can be direct according to present disclosure in the case where not departing from the application spirit and scope
It is determined that or deriving many other variations or modifications for meeting the application principle.Therefore, scope of the present application is understood that and recognized
It is set to and covers other all these variations or modifications.
Claims (10)
1. a kind of packing element with metallic packing ring, the packing element, which has, is located at the through hole (103) at center, positioned at the through hole
(103) inner surface (102) at place, the outer surface (101) corresponding with the inner surface (102), respectively be located at the packing element two
The upper end (104) and bottom (106) at end and between the upper end (104) and the bottom (106) in
Between portion (105), the upper end (104) is used to bear the first axial compressive force in axial direction, and the bottom (106) is used for
Bear second axial compressive force opposite with first axial compressive force along the axial direction, it is characterised in that one is located at
The metallic packing ring (73) of upper end serves as the upper end (104), and another is located at the metallic packing ring of lower end
(73) bottom (106) is served as, the metallic packing ring (73) includes：
The identical and end to end metal spring of thickness (731)；
The inner metal ring (732) of closure, is coated on the outside of the metal spring (731)；
The outside becket (733) of closure, is coated on the outside of the inner metal ring (732), the outside becket (733)
Hardness be less than the inner metal ring (732) hardness；
It is used to directly bear first axial compressive force in the upper surface of the metallic packing ring (73) of upper end, the institute in lower end
Stating the lower surface of metallic packing ring (73) is used to directly bear second axial compressive force, and each metallic packing ring (73) can be
Deform upon to fit respectively with central tube (30) and sleeve pipe (40) in radial direction in the presence of axial compressive force.
2. packing element according to claim 1, it is characterised in that
Full inside the inner metal ring (732) to have colloid (109), the metal spring (731) is placed in the colloid (109)
In.
3. packing element according to claim 2, it is characterised in that
The cross section of the inner metal ring (732) and the outside becket (733) is square.
4. packing element according to claim 2, it is characterised in that
The cross section of the outside becket (733) is circle, and the outside becket (733) passes through hard gasket (60) and institute
State pars intermedia (105) mediate contact.
5. packing element according to claim 4, it is characterised in that
The pars intermedia (105) be included in axial direction arrangement more than one wire sealing ring (71) and one with
On filament sealing ring (72), one of those described wire sealing ring (71) seals with one of those described filament
Ring (72) is inconsistent on the axial direction and is arranged on the lower section of the filament sealing ring (72)；
The wire sealing ring (71) includes cross one another many one metal wires and each wire bonds together
The colloid (109)；
The plurality of fibers silk of the filament sealing ring (72) including cross one another high temperature high voltage resistant and by each fiber
The colloid (109) that silk bonds together；
The overall hardness of the metallic packing ring (73) is more than the overall hardness of the wire sealing ring (71), the wire
The overall hardness of sealing ring (71) is more than the overall hardness of the filament sealing ring (72).
6. packing element according to claim 5, it is characterised in that
The wire sealing ring (71) coats the first graphite linings outside, and it is close that first graphite linings at least coat the wire
The lateral surface of seal ring (71)；
The filament sealing ring (72) coats the second graphite linings (114) outside, and second graphite linings (114) at least coat institute
State the lateral surface of filament sealing ring (72).
7. packing element according to claim 6, it is characterised in that
First graphite linings coat the lateral surface of the wire sealing ring (71), upper surface and lower surface, described second
Graphite linings (114) coat the lateral surface of the filament sealing ring (72), upper surface and lower surface；Or
First graphite linings coat the lateral surface, medial surface, upper surface and lower surface, institute of the wire sealing ring (71)
State lateral surface, medial surface, upper surface and lower surface that the second graphite linings (114) coat the filament sealing ring (72).
8. packing element according to claim 7, it is characterised in that
The outside of first graphite linings and second graphite linings (114) is coated with protective layer, and the protective layer is in high temperature
When it is destroyed and liquefy or be cured as slag.
9. a kind of packer, it is characterised in that including the packing element described in one of claim 1-8.
10. a kind of bridging plug, it is characterised in that including the packing element described in one of claim 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621433135.8U CN206448795U (en) | 2016-12-26 | 2016-12-26 | Packing element, packer and bridging plug with metallic packing ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621433135.8U CN206448795U (en) | 2016-12-26 | 2016-12-26 | Packing element, packer and bridging plug with metallic packing ring |
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| Publication Number | Publication Date |
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| CN206448795U true CN206448795U (en) | 2017-08-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201621433135.8U Active CN206448795U (en) | 2016-12-26 | 2016-12-26 | Packing element, packer and bridging plug with metallic packing ring |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106522872A (en) * | 2016-12-26 | 2017-03-22 | 隆学武 | Rubber barrel with metal sealing rings, packer and bridge plug |
| CN110118071A (en) * | 2018-02-05 | 2019-08-13 | 中国石油化工股份有限公司 | A kind of thermal production well layering section packing device and method |
-
2016
- 2016-12-26 CN CN201621433135.8U patent/CN206448795U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106522872A (en) * | 2016-12-26 | 2017-03-22 | 隆学武 | Rubber barrel with metal sealing rings, packer and bridge plug |
| CN110118071A (en) * | 2018-02-05 | 2019-08-13 | 中国石油化工股份有限公司 | A kind of thermal production well layering section packing device and method |
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