CN105333156B - One kind carries pressure compensated combined sealing structure - Google Patents
One kind carries pressure compensated combined sealing structure Download PDFInfo
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- CN105333156B CN105333156B CN201510864697.1A CN201510864697A CN105333156B CN 105333156 B CN105333156 B CN 105333156B CN 201510864697 A CN201510864697 A CN 201510864697A CN 105333156 B CN105333156 B CN 105333156B
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Abstract
One kind carries pressure compensated combined sealing structure, suitable for pivoted underground rotary steering drilling tool, connection ring loads the left end of sealing shroud by being interference fitted, the left end of the right-hand member of connection ring and metal sealing bellows welds together, and the right-hand member of metal sealing bellows is welded on the left end of pressure cylinder sleeve；Pressure cylinder sleeve high order end is provided with safety valve, check valve is provided with the right of safety valve, it is interference fitted inside pressure cylinder sleeve with piston, piston is interference fitted with the axis of guide simultaneously, at the right side of piston and spring left end weld, the right-hand member of spring is welded at the left side of helixseal, and helixseal is enclosed on the axis of guide by interference fit, and helixseal right-hand member is positioned by check ring；Drilling fluid and internal lubricating oil that connection ring main seal is entered by axis of guide activity space, helixseal and the piston drilling fluid that sealing is entered by the gap of helixseal structure jointly and internal lubrication oil, and filter by helixseal the solid particle in drilling fluid；The present invention has high temperature high voltage resistant, corrosion-resistant, impact resistance, wear-resistant, sealing property is high, the long-life the features such as.
Description
Technical field
The present invention relates to a kind of sealing suitable for full rotation guiding type rotary steering drilling tool, more particularly to a kind of band
There is pressure compensated combined sealing structure.
Background technology
The sealing of guide drilling tool mainly solves the sealing problem between rotary sleeve or non-rotating overcoat and heart axle.
Being usually used in the sealing of rotary steering drilling tool mainly has packing seal and lip packing, and both seal forms, which are mainly, to be passed through
Compressed gasketing material produces large deformation to realize, it is difficult to meet controllable bent joint rotary steering drilling tool in different drilling moulds
To the performance requirement of sealing structure under the conditions of formula and bad working environments, be mainly reflected in it is following some：
1. sealing surface has the pivot angle of scope of design, therefore sealing structure needs leaving appropriate swing space for the axis of guide
In the case of realize sealing, adjustment pivot angle size when sealing structure need automatic compensation function, it is ensured that do not produce leakage.
2. sealing structure and material can bear underground high temperature, high pressure, impact and shake that drill bit produces in broken rock can be resisted
It is dynamic.
3. encapsulant is corrosion-resistant, wear-resistant, non-aging.
4. sealing structure has higher reliability and life-span.
Because packing seal is difficult to realize radial compensation when sealing surface is swung, and can wear and tear very fast at gland；
Lip packing is difficult to meet seal request when sealing surface pressure at both sides difference has irregular change, and high in underground HTHP
Under tempering property drilling fluid environment, it is difficult to play sealing effectiveness.So, packing seal and lip packing are difficult to meet controllable bent joint
Above-mentioned requirements of the rotary steering drilling tool to sealing structure.
The content of the invention
In order to overcome the defect of above-mentioned prior art, pressure compensated combination is carried it is an object of the invention to provide one kind
Sealing structure, the structure has high temperature high voltage resistant, corrosion-resistant, impact resistance, wear-resistant, sealing property is high, the long-life the features such as.
In order to achieve the above object, the technical scheme is that：
One kind carries pressure compensated combined sealing structure, it is adaptable to pivoted underground rotary steering drilling tool, bag
Connection ring 3 is included, connection ring 3 loads the left end of sealing shroud 5, right-hand member and the metal sealing bellows 4 of connection ring 3 by being interference fitted
Left end weld together, the right-hand member of metal sealing bellows 4 is welded on the left end of pressure cylinder sleeve 8；The high order end of pressure cylinder sleeve 8 is set
Safety valve 6 is equipped with, the right of safety valve 6 is provided with check valve 7, and the inside of pressure cylinder sleeve 8 is interference fitted with piston 9, and piston 9 is simultaneously
It is interference fitted, is welded at the right side of piston 9 with the left end of spring 10 with the axis of guide 14, it is close that the right-hand member of spring 10 is welded on spiral
At the left side of envelope 12, helixseal 12 is enclosed on the axis of guide 14 by interference fit, and the right-hand member of helixseal 12 passes through spring
Back-up ring is positioned.
The high pressure resistant combination sealing groove A of three identicals is equipped with connection ring 3 and piston 9, seal groove A cross sectional shape is
Trapezoidal, O-ring seal 17 is in the middle of seal groove A, and the both sides of O-ring seal 17 are symmetrically close equipped with wedge-type seal circle 15 and backup
Seal 16.
The left end outer surface of pressure cylinder sleeve 8 processes wedgewise between safety valve 6.
The inner headed face of piston 9 contact with the axis of guide 14 distance is more than the distance of the contact with pressure cylinder sleeve 8 of piston 9.
The present invention has advantages below：
(1) present invention leaves adequate space for the axis of guide around section freedom and flexibility swing is oriented to, and is relatively easy to the axis of guide
The inclination maximum of design requirement is reached, sealing mechanism does not produce space constraint to it.
(2) present invention using combined seal ring design, wedge shape section metal o-ring, rectangular seal, O-ring it is organic
Coordinate, enhance tolerance of the sealing ring to down-hole high pressure, reduce the sealing ring failure produced by pressure differential, improve close
The working life of seal structure.
(3) present invention employs the design method that pressure compensation mechanism coordinates other potted components, pressure compensation mechanism by
Pressure cylinder sleeve 8, piston 9, spring 10, safety valve 6, check valve 7 are constituted.Pressure cylinder sleeve left end and metal sealing bellows-welding,
There are safety valve and check valve at pressure cylinder sleeve two ends outer surface processing wedgewise, pressure cylinder sleeve left end.Piston bush is in the axis of guide
On, circle cross-section is slightly longer than outer circle cross-section in piston, and piston inner hole and outer surface are provided with groove, and the arrangement of each sealing ring is same to be connected
Connect ring groove sealing ring arrangement identical.Piston right-hand member welds spring, and spring right-hand member is connected to helixseal left end.Effectively reduce
The pressure differential of seal interface both sides, reduces other potted components and is destroyed because of caused by high pressure differential, reduce leakage rate.
Brief description of the drawings
Fig. 1 is combined sealing structure schematic diagram.
Fig. 2 is sealing ring combining structure schematic diagram.
In figure：1 rotary sleeve, 2 guiding sections, 3 connection rings, 4 metal sealing bellowss, 5 sealing shrouds, 6 safety valves, 7 is unidirectional
Valve, 8 pressure cylinder sleeves, 9 pistons, 10 springs, 11 helixseals, 12 elastic gauzes, 13 check rings, 14 axis of guides, 15 wedge shapes are close
Seal, 16 backup sealing rings, 17O type circles.
Embodiment
The invention will now be described in detail with reference to the accompanying drawings.
Reference picture 1, one kind carries pressure compensated combined sealing structure, it is adaptable to pivoted underground rotary steerable drilling
Instrument (controllable bent joint), including connection ring 3, connection ring 3 load the left end of sealing shroud 5, the right side of connection ring 3 by being interference fitted
The left end with metal sealing bellows 4 is held to weld together, the right-hand member of metal sealing bellows 4 is welded on a left side for pressure cylinder sleeve 8
End；The high order end of pressure cylinder sleeve 8 is provided with safety valve 6, and the right of safety valve 6 is provided with check valve 7, and the inside of pressure cylinder sleeve 8 is with living
Plug 9 is interference fitted, and piston 9 is interference fitted with the axis of guide 14 simultaneously, and the left end at the right side of piston 9 with spring 10 is welded, bullet
The right-hand member of spring 10 is welded at the left side of helixseal 12.Helixseal 12 is enclosed on the axis of guide 14 by interference fit, and
The right-hand member of helixseal 12 is positioned by check ring.
Cutting for three identicals high pressure resistant combination sealing groove A, seal groove A is equipped with reference picture 2, connection ring 3 and piston 9
Face is shaped as trapezoidal, and O-ring seal 17 is in the middle of the seal groove A, and the both sides of O-ring seal 17 are symmetrically equipped with wedge-type seal circle 15
With backup sealing ring 16.When adjusting sealing surface pressure at both sides, piston 9 can move back and forth along the axis of guide 14, at the inside and outside circle of piston 9
All it is main pressure-bearing surface and leakage path, it is therefore desirable to high pressure sealing.
The left end outer surface of pressure cylinder sleeve 8 processes wedgewise between safety valve 6, to prevent when the bending of metal sealing bellows
Pressure cylinder sleeve 8 and sealing shroud 5 produce downthrust during deformation.
The inner headed face of piston 9 contact with the axis of guide 14 distance is more than the distance of the contact with pressure cylinder sleeve 8 of piston 9；In order to increase
Plus piston 9 is servo-actuated compensatory in 14 frequent swing of the axis of guide.
The operation principle of the present invention：Controllable bent joint is in vertical drilling, and the axis of guide 14 is in same axle with rotary sleeve
High pressure resistance sealing structure at line, connection ring 3 plays main seal with piston 9 and helixseal.The main seal of connection ring 3 by
The drilling fluid and internal lubricating oil entered at the activity space of the axis of guide 14, helixseal 12 and piston 9 are sealed by spiral jointly
Drilling fluid and internal lubrication oil that gap at 12 structures enters are sealed, and filters by helixseal 12 solid in drilling fluid
Grain.
Controllable bent joint is in guide digging, by the plastic deformation of metal sealing bellows 4, makes sealing structure with guiding
Axle produces swing angle, and ensures connection ring 3 and the stability of pressure balance mechanism, and reducing will to the floating elastic of sealing ring
Ask, reduce fretting wear destruction, overall performance is improved, in addition, the axial deformation of spring 10 and metal sealing bellows 4
Certain damping, buffering effect is played, is also very favorable to keeping stablizing relatively for high pressure sealing face.Elastic gauze 12 has
Have good servo-actuated compensatory, the gap that the axis of guide is produced in beat can be made up in time, and effectively in filtering drilling fluid
Solid particle, prevent solids particles precipitate hinder the axis of guide swing.
During whole guide digging, pressure compensation mechanism all constantly makes respective change to downhole drill hydraulic coupling,
Be maintained at by the mobile regulation sealing structure pressure at both sides difference of piston 9 within design requirement, improve the sealing structure life-span and
Performance.
Claims (2)
1. one kind carries pressure compensated combined sealing structure, it is adaptable to pivoted underground rotary steering drilling tool, it is special
Levy and be, including connection ring (3), connection ring (3) passes through the left end for being interference fitted and loading sealing shroud (5), the right-hand member of connection ring (3)
Weld together with the left end of metal sealing bellows (4), the right-hand member of metal sealing bellows (4) is welded on pressure cylinder sleeve (8)
Left end；Pressure cylinder sleeve (8) high order end is provided with the right of safety valve (6), safety valve (6) and is provided with check valve (7), pressure cylinder
Cover (8) inside to be interference fitted with piston (9), piston (9) with the axis of guide (14) while be interference fitted, at the right side of piston (9)
Welded with the left end of spring (10), the right-hand member of spring (10) is welded at the left side of helixseal (12), helixseal (12)
It is enclosed on by interference fit on the axis of guide (14), and helixseal (12) right-hand member is positioned by check ring；
The high pressure resistant combination sealing groove (A) of three identicals, the section shape of seal groove (A) are equipped with connection ring (3) and piston (9)
Shape is trapezoidal, and O-ring seal (17) is in the middle of seal groove (A), and O-ring seal (17) both sides are symmetrically equipped with wedge-type seal circle
And backup sealing ring (16) (15)；
Pressure cylinder sleeve (8) left end outer surface processes wedgewise between safety valve (6).
2. it is according to claim 1 a kind of with pressure compensated combined sealing structure, it is characterised in that
Piston (9) inner headed face contact with the axis of guide (14) distance is more than the contact distance of piston (9) and pressure cylinder sleeve (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510864697.1A CN105333156B (en) | 2015-11-30 | 2015-11-30 | One kind carries pressure compensated combined sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510864697.1A CN105333156B (en) | 2015-11-30 | 2015-11-30 | One kind carries pressure compensated combined sealing structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105333156A CN105333156A (en) | 2016-02-17 |
| CN105333156B true CN105333156B (en) | 2017-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510864697.1A Active CN105333156B (en) | 2015-11-30 | 2015-11-30 | One kind carries pressure compensated combined sealing structure |
Country Status (1)
| Country | Link |
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| CN (1) | CN105333156B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3079903B1 (en) * | 2018-04-04 | 2022-12-23 | Commissariat Energie Atomique | METAL SEAL ASSEMBLY FOR SEALING BETWEEN A ROTATING SHAFT AND A FIXED FRAME |
| CN109323004A (en) * | 2018-11-21 | 2019-02-12 | 中国航发西安动力控制科技有限公司 | A kind of reduction clearance leakage structure with transitional pressure chamber |
| CN112536732A (en) * | 2020-12-09 | 2021-03-23 | 格力电器（武汉）有限公司 | Tool for plugging interface of closed container |
| CN113622833B (en) * | 2021-08-11 | 2024-03-26 | 中国石油大学(华东) | Underground oil pressure compensation dynamic sealing device and method based on corrugated pipe |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2973978A (en) * | 1957-08-21 | 1961-03-07 | North American Aviation Inc | Bimaterial back-up ring |
| SU1665031A1 (en) * | 1989-07-20 | 1991-07-23 | Специальное Конструкторское Бюро Гидроимпульсной Техники Со Ан Ссср | Well completion unit |
| CN2545352Y (en) * | 2002-04-19 | 2003-04-16 | 胜利石油管理局钻井工程技术公司 | Rotary guide for drilling |
| CN101696729B (en) * | 2009-11-12 | 2012-05-30 | 刘宝林 | Combined sealing structure of combined sealing device and steering drilling tool |
| CN205173488U (en) * | 2015-11-30 | 2016-04-20 | 西安石油大学 | Composite seal mechanism with pressure compensation |
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2015
- 2015-11-30 CN CN201510864697.1A patent/CN105333156B/en active Active
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| Publication number | Publication date |
|---|---|
| CN105333156A (en) | 2016-02-17 |
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