CN203050598U - On-line pressure sealing composite structure of suspension body of casing head - Google Patents
On-line pressure sealing composite structure of suspension body of casing head Download PDFInfo
- Publication number
- CN203050598U CN203050598U CN 201320080688 CN201320080688U CN203050598U CN 203050598 U CN203050598 U CN 203050598U CN 201320080688 CN201320080688 CN 201320080688 CN 201320080688 U CN201320080688 U CN 201320080688U CN 203050598 U CN203050598 U CN 203050598U
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- suspension body
- flange shell
- sealing ring
- bottom flange
- casing head
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Abstract
The utility model discloses an on-line pressure sealing composite structure of a suspension body of a casing head. The on-line pressure sealing composite structure comprises a bottom flange housing and the suspension body, wherein the bottom flange housing is provided with an annular screwed plug, a shifting top thread and a steel ring slot, wherein a soft metal seal ring is arranged on a slope on which the suspension body is in contact with the bottom flange housing, a BT seal ring is arranged on either an inner cavity in which the bottom flange housing is in contact with the suspension body or the upper vertical surface of a contact surface on which the suspension body is in contact with the bottom flange housing, correspondingly, injection holes communicated with the BT seal ring are formed in either the two sides of the bottom flange housing or the top of the suspension body, and orifices of the injection holes are provided with check valve structures, so that the problem that an annular space cannot be resealed due to high pressure of strata under the condition that the soft metal seal ring is invalid can be mainly solved.
Description
Technical field
The utility model relates to the wellhead assembly of oil well, and a kind of underground pipe casing of down termination oil well is specifically taken over control spray apparatus on during drilling well, connects the suspension body band means of press seals combining structure of a kind of casing head of production tree on after finishing.
Background technology
In the on-the-spot well cementing operation of petroleum exploration and development, must use casing head, the effect of casing head is outer layer sleeve and the inner layer sleeve that the bottom connects oil well, and makes the annular space between two sleeve pipes obtain sealing.
Casing head of the prior art is divided into slip-type casing tube head and suspension type casing head, wherein the card tooth of slip-type casing tube head inevitably can damage inner layer sleeve, and need dismantle preventer when installing, use special-purpose aid to throw in the card tooth, workload is big, operating difficulties.The suspension type casing head is made up of flange shell and suspension body, and step is arranged in the suspension body, and the casing coupling step on inner layer sleeve top is sitting on the suspension body interior step during well cementation, can not damage inner sleeve, and installation rate makes moderate progress.
At present, sealing between oil drilling industry middle sleeve head and suspension body mainly contains two kinds: a kind of is the combination of soft metal and common O type circle, and its existing problems are that the soft metal common O type circle that in a single day lost efficacy is difficult to the high-pressure of sealing shroud tube head is carried out effective seal.Another kind is that rubber cushion compresses sealing, and its structure realizes sealing for compress thick offset plate with bolt, and deficiency is to dismantle the operation of preventer ability, and uses offset plate not realize effective seal under high temperature, high pressure merely.Because the oil drilling pressure inside from the stratum, can't realize pressure sealing in case leak for above-mentioned two kinds of seal form.
The utility model content
In order to overcome the shortcoming that above-mentioned prior art exists, the purpose of this utility model is to provide a kind of suspension body band means of press seals combining structure of casing head, can realize being with means of press seals.
The technical scheme in the invention for solving the technical problem is: a kind of suspension body band means of press seals combining structure of casing head, comprise end flange shell and suspension body, wherein end flange shell is provided with annular space plug, anti-moving jackscrew, steel ring slot, the slope that suspension body contacts with end flange shell is provided with the soft metal sealing ring, in end flange shell and inner chamber that suspension body contacts, the BT sealing ring is set, both sides at end flange shell arrange the injection hole that communicates with the BT sealing ring, and place, the aperture of injection hole arranges one-way valve structures.
As another kind of scheme: also the BT sealing ring can be arranged on the last vertical plane of suspension body and end flange shell contact surface, and the injection hole that will communicate with the BT sealing ring is arranged on the suspension body top.
The further improvement project of above-mentioned two kinds of schemes: described soft metal sealing ring is arranged on the top of the slope that described suspension body contacts with end flange shell, is that drill bit and drilling tool bump and hang the soft metal sealing ring thereby avoid down boring, and has improved the reliability of sealing.
The beneficial effects of the utility model are: with the soft metal sealing ring as primary seal, it leakage occurred in case lose efficacy, then inject Powdered Teflon from injection hole, excite the BT sealing ring to fill gap between suspension body and the end flange shell fast, to reseal annulus, place, aperture at inlet arranges one-way valve structures, needn't dismantle the preventer part on casing head top, just can fulfil assignment under band pressure situation.
Description of drawings
Fig. 1 is the structural representation of the utility model embodiment one;
Fig. 2 is the partial structurtes schematic diagram of the utility model embodiment two;
Among the figure: 1 end flange shell; 2 suspension bodies; 3 soft metal sealing rings; 4 injection holes; The 5BT sealing ring; 6 steel ring slots; 7 anti-moving jackscrews; 8 one way valves; 9 annular space plugs.
The specific embodiment
Embodiment one: as shown in Figure 1, a kind of suspension body band means of press seals combining form of casing head, comprise end flange shell 1 and suspension body 2, wherein end flange shell is provided with annular space plug 9, anti-moving jackscrew 7, steel ring slot 6, one of them annular space plug 9 connects flap type, be used for injecting liquid and release pressure to annular space, another annular space plug 9 connects the pressure meter assembly, is used for observing annular pressure; Put into a steel ring in the steel ring slot 6, be used for the sealing between end flange shell 1 and the preventer combination lower flange; Anti-moving jackscrew 7 is used for fixedly suspension body, prevents that it from moving axially and circumferentially rotating.
In end flange shell 1 and inner chamber that suspension body 2 contacts, BT sealing ring 5 is set, is used for the annulus between sealing end flange shell 1 and the suspension body 2, prevent that annular pressure from leaking; The slope that suspension body 2 contacts with end flange shell 1 is provided with soft metal sealing ring 3, it and BT sealing ring 5 constitute jointly double seal, both sides at end flange shell 1 arrange the injection hole 4 that communicates with BT sealing ring 5, be used for injecting Powdered Teflon to BT sealing ring 5, and 4 places, aperture of injection hole arrange one way valve 8 structures.
Embodiment two: as shown in Figure 2, the difference of this embodiment and embodiment one only is: BT sealing ring 5 is arranged on the last vertical plane of suspension body 2 and end flange shell 1 contact surface, the injection hole 4 that communicates with BT sealing ring 5 is set at suspension body 2 tops, the BT sealing ring 5 that elimination is made with rubber because being subjected to washing away, corroding of drilling fluid, and damages the defective that makes seal failure too early in drilling process.The place, aperture of described injection hole 4 arranges one way valve 8.Injection hole 4 among this embodiment, the position relation between the one way valve 8, structural relation etc. are all identical with embodiment one, so though do not draw in detail in Fig. 2, those of ordinary skills can be directly with reference to beyond all doubt directly the drawing of Fig. 1.
All the other technology of this embodiment repeat no more with embodiment one.Except the described technical characterictic of manual, be the known technology of those skilled in the art.
Claims (3)
1. the suspension body band means of press seals combining structure of a casing head, comprise end flange shell (1) and suspension body (2), wherein end flange shell is provided with annular space plug (9), anti-moving jackscrew (7), steel ring slot (6), the slope that described suspension body (2) contacts with flange shell of the described end (1) is provided with soft metal sealing ring (3), it is characterized in that, in flange shell of the described end (1) and inner chamber that described suspension body (2) contacts, BT sealing ring (5) is set, both sides at flange shell of the described end (1) arrange the injection hole (4) that communicates with described BT sealing ring (5), and place, the aperture of described injection hole (4) arranges one way valve (8).
2. the suspension body band means of press seals combining structure of a casing head, comprise end flange shell (1) and suspension body (2), wherein end flange shell is provided with annular space plug (9), anti-moving jackscrew (7), steel ring slot (6), the slope that described suspension body (2) contacts with flange shell of the described end (1) is provided with soft metal sealing ring (3), it is characterized in that, last vertical plane at described suspension body (2) and flange shell of the described end (1) contact surface arranges BT sealing ring (5), the injection hole (4) that communicates with described BT sealing ring (5) is set at described suspension body (2) top, and the place, aperture of described injection hole (4) arranges one way valve (8).
3. the suspension body band means of press seals combining structure of a kind of casing head according to claim 1 and 2 is characterized in that, described soft metal sealing ring (3) is arranged on the top of the slope that described suspension body (2) contacts with flange shell of the described end (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320080688 CN203050598U (en) | 2013-02-21 | 2013-02-21 | On-line pressure sealing composite structure of suspension body of casing head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320080688 CN203050598U (en) | 2013-02-21 | 2013-02-21 | On-line pressure sealing composite structure of suspension body of casing head |
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| CN203050598U true CN203050598U (en) | 2013-07-10 |
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| CN 201320080688 Expired - Lifetime CN203050598U (en) | 2013-02-21 | 2013-02-21 | On-line pressure sealing composite structure of suspension body of casing head |
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- 2013-02-21 CN CN 201320080688 patent/CN203050598U/en not_active Expired - Lifetime
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Address after: 253034 Jinghua South Road, Dezhou Economic Development Zone, Shandong Province Patentee after: DEZHOU UNITED PETROLEUM TECHNOLOGY Corp. Address before: 253000 Shandong Province, Dezhou City Economic Development Zone South Road crystal Patentee before: DEZHOU UNITED PETROLEUM MACHINERY Co.,Ltd. |
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Granted publication date: 20130710 |