CN105756611A - Rubber cylinder with cylindrical inner cores - Google Patents
Rubber cylinder with cylindrical inner cores Download PDFInfo
- Publication number
- CN105756611A CN105756611A CN201610181642.5A CN201610181642A CN105756611A CN 105756611 A CN105756611 A CN 105756611A CN 201610181642 A CN201610181642 A CN 201610181642A CN 105756611 A CN105756611 A CN 105756611A
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- China
- Prior art keywords
- packing element
- inner core
- collar
- element according
- rubber cylinder
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/1208—Packers; Plugs characterised by the construction of the sealing or packing means
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/128—Packers; Plugs with a member expanded radially by axial pressure
Abstract
The invention relates to the technical field of sealing in oil exploitation industry, in particular to a rubber cylinder provided with cylindrical inner cores and capable of resisting high temperature and high pressure. The rubber cylinder comprises a sealing body and a plurality of inner cores, wherein the sealing body comprises a through hole positioned in the center, an inner surface, an outer surface, a first end part and a second end part; each inner core is cylindrical as a whole and extends in an axial direction of the rubber cylinder; each inner core has mutually crossed high-temperature-resistant and high-pressure-resistant fiber silks; and a rubber matrix is distributed on the surface and in the interior of each inner core and bonds the fiber silks; and the diameters of the inner cores on one cross section of the rubber cylinder in the radial direction are different. The interior of the rubber matrix is covered with the inner cores and each inner core has the mutually crossed fiber silks, so that the rubber matrix is distributed on the surface and in the interior of each inner core and bonds the fiber silks. When the rubber cylinder is expanded due to an axial pressure, the fiber silks limit the expansion, so that the structure hardness of the rubber cylinder is improved as a whole and the compressive strength of the rubber cylinder is enhanced.
Description
Technical field
The present invention relates to the technical field of sealing technology of oil exploitation industry, particularly relate to a kind of packing element with cylindric inner core that can bear High Temperature High Pressure.
Background technology
Packing element is the sealing member for field of petroleum exploitation, and packing element is generally adopted rubber type of material and makes, therefore is referred to as packing element.Should be noted that, packing element is only the technical term that in a kind of industry, agreement becomes social custom, for representing the functional parts used in oil exploitation process or the parts coordinating packer to use as packer, and the material referring not only to packing element needs to be made by rubber.When packing element bears certain pressure to promote its deformation for sealing, it is necessary to consider the deformability of packing element itself, if deformation deficiency can cause that it cannot play sealing function；If deformation is excessive, it is possible to cause that packing element lost efficacy because of conquassation, lose recovery capability.The most important thing is, when packing element is subject to high-temperature steam effect, packing element is more affected by the effect of High Temperature High Pressure and lost efficacy and cause losing recovery capability.
Inventor have found that, the soft or hard (under certain pressure the deformation extent of colloid) of colloid owing to constituting packing element is variant, when using softer colloid to make packing element, this packing element can because cannot sustain the axial compressive force of nominal amount and by conquassation.
Summary of the invention
It is an object of the invention to provide the packing element of a kind of new structural design, increase the comprcssive strength of packing element.
The present invention provides a kind of packing element, there is seal, outer surface that described seal has the through hole being centrally located, be positioned at through hole inner surface is corresponding with described inner surface and lay respectively at first end and the second end at described packing element two ends, described packing element includes multiple inner core, each described inner core is on the whole all cylindrically and extend along the axial direction of described packing element, each described inner core is respectively provided with the plurality of fibers silk of cross one another high temperature high voltage resistant, and colloid is distributed on the surface of each described inner core and internal and by bonding for each described cellosilk；
Wherein, the diameter of each described inner core in the radial direction cross section of described packing element is different.
Preferably, on described axial direction, quantity is the length length equal to described through hole of the described inner core of.
Preferably, on described axial direction, quantity is that the described inner core of at least two is mutually bonded and the length sum of bonding each described inner core is equal to the length of described through hole.
Preferably, the thickness of described inner core is 1.8mm-2.5mm.
Preferably, the quantity of described inner core is 10-15.
Preferably, described packing element be additionally included on described axial direction extend about collar, described about collar entirety is enlarging shape, the flared end of described about collar is set on described first end or described the second end, and the necking end of described about collar extends through by the sheathed described first end of described flared end or described the second end for bearing axial compressive force.
Preferably, after bearing described axial compressive force, described about collar entirety is cylindrically.
Preferably, described necking end has inside bevelling.
Preferably, it is that reducing shape matches with described flared end by the sheathed described first end of described flared end or described the second end.
Preferably, described about collar is copper, and the maximum gauge of described flared end 22 is less than or equal to 2mm.
Preferably, the quantity of described about collar is two, and the flared end of one of them described about collar is set in described first end, and the flared end of another described about collar is set on described the second end.
According to technique scheme provided by the invention, owing to being coated with inner core in colloid, inner core has cross one another cellosilk, and colloid is distributed on the surface of each inner core and internal and by bonding for each cellosilk.When packing element is subject to axial compressive force and expands, cellosilk will limit this expansion, thus increasing the structural rigidity of packing element on the whole, increases the comprcssive strength of packing element.
Accompanying drawing explanation
Some specific embodiments of the present invention are hereinafter described in detail with reference to the accompanying drawings by way of example, and not by way of limitation.Accompanying drawing labelling identical in accompanying drawing denotes same or similar parts or part.In accompanying drawing:
Fig. 1 is the packing element position relationship schematic diagram with central canal and sleeve pipe of one embodiment of the invention；
Fig. 2 is the structural representation of packing element according to an embodiment of the invention；
Fig. 3 is the structural representation of about collar according to an embodiment of the invention；
Fig. 4 is the structural representation comprising the about packing element of collar according to an embodiment of the invention, it illustrates the position relationship of the about collar before compression and seal；
About collar when Fig. 5 is to compress in Fig. 4 and the structural representation of seal, it illustrates the projection formed in sealant surface；
Fig. 6 is the structural representation of the about collar after compressing in Fig. 4 and seal；
Fig. 7 is the part-structure schematic diagram of packing element in accordance with another embodiment of the present invention
Fig. 8 is the schematic diagram that in Fig. 7, internal layer inner core is combined with colloid；
Fig. 9 is the structural representation of the packing element of syllogic according to an embodiment of the invention.
Accompanying drawing labelling in figure is as follows:
10-packing element, 101-outer surface, 102-inner surface, 103-through hole, 104-first end, 105-the second end；
106-internal layer inner core, 107-middle level inner core, 108-outer layer inner core, 109-colloid；
20-is about collar, 21-necking end, 22-flared end；
30-central canal；
40-sleeve pipe；
50-seal；
60-is protruding；
200-compression packer；
A-axial direction；
F-axial compressive force.
Detailed description of the invention
Packer is a kind of key tool that oil field well recovers the oil, it is widely used in the several work purpose needs such as oil field dispensing, separate zone stimulation, oil production by layer, mechanical pipe water blockoff, packer needs to carry out the packing of annular space, and the core component realizing annular space packing is packing element.Packing element is as the core component of packer, and its quality directly affects result of use and the service life of packer, plays conclusive effect in packer.Inventor have found that, the soft or hard owing to constituting the colloid of packing element is variant, for instance, when being colloid when using polyetheretherketonematerials materials, owing to polyether-ether-ketone is harder, reach pressure when setting bigger.When use softer colloid make packing element time, this packing element can because cannot sustain the axial compressive force of nominal amount and by conquassation.
Compression packer 200 as shown in Figure 1 has the packing element 10 of the application, and described packing element 10 is generally cylindric.Compression packer 200 needs in the wellbore different oil reservoirs, water layer are separated and born certain pressure reduction, it is desirable to can descending pit shaft precalculated position, packing is tight, can have durability in down-hole again, it is necessary to time can trip out smoothly.
As shown in Figure 2, in an embodiment of the application, a kind of packing element 10 is provided, packing element 10 has seal 50, seal 50 has the through hole 103 being centrally located, this through hole 103 is formed by the inner surface 102 of packing element 10, and outer surface 101 is positioned at the outside of the through hole 103 corresponding with inner surface 102, and packing element 10 two ends are first end 104 and the second end 105.When acting on first end 104 and the second end 105 as the axial compressive force F of axial direction A, packing element 10 entirety will be compressed, promote outer surface 101 outwardly convex and inner surface 102 inwardly protruding, so that inner surface 102 seals with the central canal 30 in Fig. 1, and outer surface 101 is made to seal with the sleeve pipe 40 in Fig. 1.Referring to Fig. 4, Fig. 5 and Fig. 6, usually, space between inner surface 102 and central canal 30 is less, and gap between outer surface 101 and sleeve pipe 40 is bigger, due to the restriction effect of central canal 30 and sleeve pipe 40, so causing that the degree of outer surface 101 outwardly convex is more than the inwardly protruded degree of inner surface 102.
Inventor is in solving the process that colloid is softer, and the cellosilk of multiple high temperature high voltage resistant being separated from each other that once adulterated in colloid, this structure can solve the problem that the problem that packing element 10 entirety is partially soft to a certain extent.But, present inventors have further found that, although the cellosilk of doping is connected with colloid, but be substantially not connected between each cellosilk or connect less, so the hardness of packing element 10 can only limitedly be increased.So, inventor has devised following technical scheme: use cross one another plurality of fibers silk one inner core of composition, the inner core of this spline structure has certain ductility in radial direction, in other words, inner core can not rupture within the specific limits in diameter change, and in the process that inner core diameter becomes big, cross one another cellosilk promotes, by offsetting a part, the axial compressive force F that the change of its diameter is big, thus to make the diameter of inner core increase to a certain degree, it is desirable to provide bigger axial compressive force F.Especially, colloid 109 is distributed on the surface of each described inner core and internal and by design bonding for each cellosilk, cause colloid 109 to be linked together tightly by the cellosilk of each intersection, to make the diameter of inner core increase to a certain degree, it is desirable to provide axial compressive force F just bigger.It is to say, glue is cured as colloid, colloid is by one resistance of bonding for each cellosilk formation, and each cellosilk intersection forms again a resistance, and under the effect of the two resistance, the more difficult compression of packing element 10 entirety, it is hardening that this shows as packing element 10.Inventor is through overtesting, it has been found that can probably adjust cross one another filametntary quantity by the thickness of change inner core, and then can adjust the size of the size setting force in other words of required axial compressive force F.
In embodiment as shown in Figure 7, packing element 10 includes internal layer inner core 106, middle level inner core 107 and 108 3 inner cores of outer layer inner core, Fig. 7 is only and schematically illustrates packing element 10 and have the part in 12 inner cores, usually, the quantity of described inner core is set to 10-15, such as the quantity of inner core can be chosen as 10 in one embodiment, in another embodiment the quantity of inner core is chosen as 15.It is significant to note that, each described inner core is respectively provided with the plurality of fibers silk (not shown) of cross one another high temperature high voltage resistant, for instance each cellosilk longitude and latitude is woven together.Cellosilk can be the material of other high temperature high voltage resistant such as glass fibre or carbon fiber.Described filametntary diameter is 7-30 μm, thus having the cellosilk of substantial amounts on an inner core, can improve the hardness of packing element 10 greatly, filametntary diameter can also be other numerical value in other embodiments, but the test according to inventor, to be advisable less than 2mm.This is because, inventor have found that, by relatively difficult for the inner core that the glue forming colloid 109 penetrates into multifilament, the speed that glue penetrates into when the thickness of inner core is 2mm is the best, and the speed that glue penetrates into after the thickness of inner core is more than 2.5mm will be very slow.So, in one embodiment, the thickness of each described inner core is 2mm, can also be 1.8mm or 2.5mm in other embodiments.
By narration above it can be seen that in the technical scheme of the application, be not required to this cellosilk and have elasticity, this is owing to contraction and the expansion of packing element 10 are completed by seal 50, is completed by the colloid 109 in seal 50 more precisely.Mentioned above, colloid 109 is distributed on the surface of each described inner core and internal and by bonding for each described cellosilk.It is desired that the bonding every cellosilk of colloid 109, and each cellosilk is bonded together across.Owing to all being sealed by colloid 109 inside and outside inner core, thus seeing on the whole, inner core not as shown in Figure 7 and Figure 8 obvious like that, and entirety is all covered by colloid as common packing element.
Referring to Fig. 2, each described inner core is on the whole all cylindrically and extend along the axial direction A of described packing element 10, as shown in Figure 7, the diameter of each described inner core on a cross section of the radial direction of described packing element 10 is different, and such structure can increase the hardness of packing element 10.When distance between each inner core is identical, additionally it is possible to the hardness in equal area making packing element 10 as much as possible is essentially identical, otherwise packing element 10 unbalance stress and locally caving in.But, when as it is shown in figure 9, when packing element 10 is syllogic, the cross section of the radial direction of each section of packing element can as it is shown in fig. 7, thus the packing element 10 shown in Fig. 9 generally speaking, just there are three identical inner cores being sequentially distributed in the axial direction of diameter.
Technical scheme according to the application, owing to being coated with inner core in colloid 109, inner core has cross one another cellosilk, and colloid 109 is distributed on the surface of each inner core and internal and by bonding for each cellosilk.First, being mixed with cellosilk in colloid 109, when packing element 10 is subject to axial compressive force and expands (inwardly or outwardly), cellosilk will limit this expansion, thus increasing the structural rigidity of packing element 10 on the whole, increases the comprcssive strength of packing element 10.Especially, when cellosilk consists of a cylindric inner core, when inner core is subject to axial compressive force F, inner core can evenly radially be expanded, the inner surface 102 essentially homogeneously inwardly protruding of packing element 10 can be made when being subject to axial compressive force, outer surface 101 outwardly convex equably, it is therefore prevented that uneven projection and cause the partial collapse of packing element 10, it is therefore prevented that uneven radial dilatation and cause the partial collapse of packing element 10.Further, in an embodiment of the application, the colloid thickness between each layer inner core is identical, thus can guarantee that the end of the packing element 10 being subject to axial compressive force F effect can stress equably in its surface, it is therefore prevented that the end of packing element 10 is by conquassation.
Referring to Fig. 7, when the through hole 103 of internal layer inner core 106 and the packing element 10 of the packing element 10 in Fig. 7 is equally long, say, that in axial direction A, quantity is the length length equal to through hole 103 of the inner core of, and it can form the packing element 10 shown in Fig. 2.In the same manner, in described axial direction A, quantity is that the described inner core of at least two is mutually bonded and the length sum of bonding each described inner core is equal to the length of described through hole 103, for instance when being three, it can form the packing element 10 shown in Fig. 9, thus forming multiple seal section.The not shown about collar arranged two ends in Fig. 9, but illustrate that the place connected at every section of packing element is provided with about collar 20.
About collar 20 of packing element 10 are described in detail below.
With reference to Fig. 3-Fig. 6, wherein Fig. 3 illustrates the structural representation of the about collar 20 before being compressed by axial compressive force F, Fig. 4 illustrates the position relationship schematic diagram of the about collar 20 before being compressed by axial compressive force F and seal 50, Fig. 5 illustrates that Fig. 6 illustrates the schematic shapes of the about collar after compression 20 and seal 50 by the change schematic diagram of about collar 20 and seal 50 in axial compressive force F compression process.
As it is shown on figure 3, about collar 20 is overall in enlarging shape, it has flared end 22 and necking end 21.Referring to Fig. 4, the flared end 22 of described about collar 20 is set on described first end 104 and described the second end 105, in other embodiments, flared end 22 can also only be set on one of first end 104 and the second end 105, and it has mainly depended on that this end prevents from deforming in compression process excessive the need of restrained deformation.In Fig. 4-Fig. 6, the quantity of described about collar 20 is two, and the flared end 22 of one of them described about collar 20 is set in described first end 104, and the flared end 22 of another described about collar 20 is set on described the second end 105.Referring to Fig. 5, the necking end 21 of described about collar 20 extends through by the sheathed described first end 104 of described flared end 22 or described the second end 105 for bearing axial compressive force.In figures 4 and 5, it is only the position relationship showing schematically about collar 20 and seal 50, it practice, about collar 20 is combined closely with seal 50, namely contacts with each other between the two.From fig. 6, it can be seen that after bearing axial compressive force F, described about collar 20 entirety is cylindrically.Further, about the flared end 22 of collar 20 is essentially identical with the diameter of necking end 21, and both diameters are identical with the internal diameter of sleeve pipe 40, and now the outer surface 101 of seal 50 seals with sleeve pipe 40, and the inner surface 102 of seal 50 seals with central canal 30.
About the effect of collar 20 is extremely important in this application, and this is owing to the inner core of the application is all axially arranged, and is also axial compressive force to inner core generation effect.So, it is however very well possible to ground, inner core can scatter in radial direction because of the effect of axial compressive force, causes that each inner core of packing element 10 separates.By about collar 20 in the constraint of end, it is possible to limit the inner core separation at outermost both sides place.And the colloid that has in other place of inner core is filled, so the probability separated is less.
In the embodiment shown in figs. 4 and 5, the edge chamfer of first end 104 and the second end 105 processes and adapts with about collar 20, it is to say, matched with described flared end 22 in reducing shape by the sheathed described first end 104 of described flared end 22 and described the second end 105.This design of packing element 10 can increase the end of packing element 10 and the contact area of about collar 20, and between end and the axial compressive force F of this kind of design, there is angle, thus needing bigger axial compressive force F ability compression seal body 50 to produce the deformation of nominal amount, a degree of setting force increasing needs.As shown in Figure 6, after applying axial compressive force F, packing element 10 inwardly or outwardly will extend to radial direction, constraint due to sleeve pipe 40, now about collar 20 will carry out expansion radially in the scope that sleeve pipe 40 limits, the flared end 22 of final about collar 20 is by essentially identical with the diameter of seal 50, and also essentially identical with the internal diameter of sleeve pipe 40.As it is shown in figure 5, in compression process, can form projection, schematically illustrating a projection 60 in Fig. 5, when actual compression, outer surface 101 entirety of seal 50 expands outwardly as projection, and inner surface 102 entirety is inward expansion as projection.Very important, if about collar 20 is chosen as the material of difficult deformation, then as shown in Figure 5, when continuing compression, the top edge with about collar 20 is contacted by protruding 60, and finally causes shearing to protruding 60, have impact on the sealing of seal 50.About collar is chosen as copper sheathing in this application, and determines the maximum gauge of flared end 22 less than 2mm in upper thickness limit, and flared end 22 refers to whole trumpet-shaped edge in such as Fig. 3, but not that end face of the rightmost side in a Fig. 3.Such restriction enables to about collar 20 will not cause damage to protruding 60, or damage is comparatively slight.And being also beneficial in compression process, about collar 20 is deformed and becomes as shown in Figure 6 by sleeve pipe 40.Based on same reason, can not using about collar 20 of perpendicular type as shown in Figure 6 before compression, otherwise in the process of compression, about the outer surface 101 of seal protruding gradually also can be produced to shear by collar 20.In this application, described about collar 20 is bell mouth shape, and in the process of compression, about collar 20 is that a kind of face contacts but not linear contact lay with protruding 60, greatly reduces the probability of protruding 60 damages.And as it is shown on figure 3, necking end 21 has inside bevelling, when compression, bevelling will be around central canal 30, and bevelling receives axial compressive force F, such is designed to make wedging ring 20 deformation in an orderly manner, gradually, will not by the unexpected conquassation of axial compressive force F.
So far, those skilled in the art will recognize that, although the detailed multiple exemplary embodiments illustrate and describing the application herein, but, when without departing from the application spirit and scope, still can directly determine according to present disclosure or derive other variations or modifications many meeting the application principle.Therefore, scope of the present application is it is understood that cover all these other variations or modifications with regarding as.
Claims (10)
1. a packing element (10), there is seal, outer surface (101) that described seal (50) has the through hole (103) being centrally located, be positioned at through hole (103) place inner surface (102) is corresponding with described inner surface (102) and lay respectively at first end (104) and the second end (105) at described packing element (10) two ends, it is characterized in that
Described packing element (10) includes multiple inner core, each described inner core is on the whole all cylindrically and extend along the axial direction of described packing element (10), each described inner core is respectively provided with the plurality of fibers silk of cross one another high temperature high voltage resistant, and colloid (109) is distributed on the surface of each described inner core and internal and by bonding for each described cellosilk；
Wherein, the diameter of each described inner core in the radial direction cross section of described packing element (10) is different.
2. packing element according to claim 1 (10), it is characterised in that
On described axial direction, quantity is the length length equal to described through hole (103) of the described inner core of.
3. packing element according to claim 1 (10), it is characterised in that
On described axial direction, quantity is that the described inner core of at least two is mutually bonded and the length sum of bonding each described inner core is equal to the length of described through hole (103).
4. packing element according to claim 1 (10), it is characterised in that
The thickness of described inner core is 1.8mm-2.5mm.
5. packing element according to claim 1 (10), it is characterised in that
The quantity of described inner core is 10-15.
6. packing element according to claim 1 (10), it is characterised in that also include:
The about collar (20) extended on described axial direction, described about collar (20) is overall in enlarging shape, the flared end (22) of described about collar (20) is set on described first end (104) or described the second end (105), and the necking end (21) of described about collar (20) extends through and is used for bearing axial compressive force by the sheathed described first end (104) of described flared end (22) or described the second end (105).
7. packing element according to claim 6 (10), it is characterised in that
Described necking end (21) has inside bevelling.
8. packing element according to claim 6 (10), it is characterised in that
The described first end (104) sheathed by described flared end (22) or described the second end (105) match with described flared end (22) in reducing shape.
9. packing element according to claim 6 (10), it is characterised in that
Described about collar (20) is for copper, and the maximum gauge of described flared end 22 is less than or equal to 2mm.
10. packing element according to claim 6 (10), it is characterised in that
The quantity of described about collar (20) is two, the flared end (22) of one of them described about collar (20) is set in described first end (104), and the flared end (22) of another described about collar (20) is set on described the second end (105).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610181642.5A CN105756611A (en) | 2016-03-28 | 2016-03-28 | Rubber cylinder with cylindrical inner cores |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610181642.5A CN105756611A (en) | 2016-03-28 | 2016-03-28 | Rubber cylinder with cylindrical inner cores |
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| Publication Number | Publication Date |
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| CN105756611A true CN105756611A (en) | 2016-07-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610181642.5A Pending CN105756611A (en) | 2016-03-28 | 2016-03-28 | Rubber cylinder with cylindrical inner cores |
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| CN101171400A (en) * | 2005-03-30 | 2008-04-30 | 施蓝姆伯格技术公司 | Improved inflatable packers |
| CN101319603A (en) * | 2008-07-23 | 2008-12-10 | 姚洪全 | High-strength sealing steam injection packer |
| CN201262064Y (en) * | 2008-09-26 | 2009-06-24 | 逄瑞龙 | Compression type glue barrel with shoulder protection function |
| CN102505927A (en) * | 2011-12-16 | 2012-06-20 | 中国石油天然气股份有限公司 | Metal wrapped-type high-temperature sealing structure and manufacturing method thereof |
| CN202810772U (en) * | 2012-09-03 | 2013-03-20 | 中国石油化工股份有限公司 | Thermal recovery combined sealing device |
| CN203742532U (en) * | 2014-03-15 | 2014-07-30 | 盐城市畅海精密机械有限公司 | Novel fracturing packer |
| CN205422631U (en) * | 2016-03-28 | 2016-08-03 | 天鼎联创密封技术（北京）有限公司 | Packing element with cylindric inner core |
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2016
- 2016-03-28 CN CN201610181642.5A patent/CN105756611A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101171400A (en) * | 2005-03-30 | 2008-04-30 | 施蓝姆伯格技术公司 | Improved inflatable packers |
| CN101319603A (en) * | 2008-07-23 | 2008-12-10 | 姚洪全 | High-strength sealing steam injection packer |
| CN201262064Y (en) * | 2008-09-26 | 2009-06-24 | 逄瑞龙 | Compression type glue barrel with shoulder protection function |
| CN102505927A (en) * | 2011-12-16 | 2012-06-20 | 中国石油天然气股份有限公司 | Metal wrapped-type high-temperature sealing structure and manufacturing method thereof |
| CN202810772U (en) * | 2012-09-03 | 2013-03-20 | 中国石油化工股份有限公司 | Thermal recovery combined sealing device |
| CN203742532U (en) * | 2014-03-15 | 2014-07-30 | 盐城市畅海精密机械有限公司 | Novel fracturing packer |
| CN205422631U (en) * | 2016-03-28 | 2016-08-03 | 天鼎联创密封技术（北京）有限公司 | Packing element with cylindric inner core |
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Application publication date: 20160713 |
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| RJ01 | Rejection of invention patent application after publication |