CN105333156A - Combined sealing structure with pressure compensation - Google Patents

Combined sealing structure with pressure compensation Download PDF

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Publication number
CN105333156A
CN105333156A CN201510864697.1A CN201510864697A CN105333156A CN 105333156 A CN105333156 A CN 105333156A CN 201510864697 A CN201510864697 A CN 201510864697A CN 105333156 A CN105333156 A CN 105333156A
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China
Prior art keywords
seal
piston
left end
cylinder sleeve
interference fit
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CN201510864697.1A
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Chinese (zh)
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CN105333156B (en
Inventor
张光伟
展茂雷
刘英海
田伟康
刘畅
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Xian Shiyou University
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Xian Shiyou University
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  • Sealing Devices (AREA)

Abstract

The invention discloses a combined sealing structure with pressure compensation. The combined sealing structure is applicable to a full rotary type underground rotary steering drilling tool. A connecting ring is mounted at the left end of a seal cartridge in an interference fit manner; the right end of the connecting ring is welded with the left end of a metallic seal corrugated pipe; the right end of the metallic seal corrugated pipe is welded at the left end of a pressure cylinder sleeve; a safety valve is arranged at the leftmost end of the pressure cylinder sleeve; a one-way valve is arranged on the right side of the safety valve; the interior of the pressure cylinder sleeve and a piston are in interference fit; the piston is in interference fit with a guide shaft at the same time; the right end face of the piston is welded with the left end of a spring; the right end of the spring is welded at the left end face of a spiral seal; the spiral seal sleeves the guide shaft in an interference fit manner; the right end of the spiral seal is positioned through a spring collar; the connecting ring mainly seals drilling fluid entering from the movable space of the guide shaft and interior lubricating oil; the spring seal and the piston jointly seal the drilling fluid entering from the spiral seal structure and the interior lubricating oil; the spiral seal filters the solid particles in the drilling fluid. The combined sealing structure has the characteristics of high temperature resistance, high pressure resistance, corrosion resistance, impact resistance, wear resistance, high sealing property and long service life.

Description

A kind of with pressure compensated combined sealing structure
Technical field
The present invention relates to a kind of sealing being applicable to full rotation guiding type rotary steering drilling tool, particularly one is with pressure compensated combined sealing structure.
Background technique
The sealing of guide drilling tool mainly solves rotary sleeve or the sealing problem between non-rotating overcoat and axle.The sealing being usually used in rotary steering drilling tool mainly contains packing seal and lip seal, these two kinds of seal form are mainly realized by compressed gasketing material generation large deformation, be difficult to meet the performance requirement of controllable bent joint rotary steering drilling tool to sealing configuration under different drill mode and bad working environments condition, be mainly reflected in following some:
1. there is the pivot angle of scope of design in sealing surface, and therefore sealing configuration needs to realize sealing when leaving suitable swing space for the axis of guide, and during adjustment pivot angle size, sealing configuration needs automatic compensation function, ensures not produce leakage.
2. sealing configuration and material can bear down-hole high temperature, high pressure, can resist the shock and vibration that drill bit produces when broken rock.
3. sealing material is corrosion-resistant, wear-resistant, not easily aging.
4. sealing configuration has higher reliability and life-span.
Due to, packing seal is difficult to realize radial compensation when sealing surface swings, and can wear and tear comparatively fast near gland place; Lip seal is difficult to meet seal request when sealing surface pressure at both sides difference exists irregular change, and under high the tempering property drilling fluid environment of down-hole High Temperature High Pressure, is difficult to play sealing effect.So packing seal and lip seal are difficult to meet the above-mentioned requirements of controllable bent joint rotary steering drilling tool to sealing configuration.
Summary of the invention
In order to overcome the defect of above-mentioned prior art, the object of the present invention is to provide a kind of with pressure compensated combined sealing structure, this structure has high temperature high voltage resistant, corrosion-resistant, shock-resistant, wear-resistant, the features such as sealability is high, long lifetime.
In order to achieve the above object, technological scheme of the present invention is:
A kind of with pressure compensated combined sealing structure, be applicable to pivoted down-hole rotary steering drilling tool, comprise connecting ring 3, connecting ring 3 loads the left end of stuffing box gland 5 by interference fit, the right-hand member of connecting ring 3 and the left end of metal sealing bellows 4 weld together, and the right-hand member of metal sealing bellows 4 is welded on the left end of pressure cylinder sleeve 8; Pressure cylinder sleeve 8 high order end is provided with safety valve 6, the right of safety valve 6 is provided with one-way valve 7, pressure cylinder sleeve 8 inside and piston 9 interference fit, with the axis of guide 14 interference fit while of piston 9, the right side place of piston 9 welds with the left end of spring 10, the right-hand member of spring 10 is welded on the left side place of spiral seal 12, and spiral seal 12 is enclosed within the axis of guide 14 by interference fit, and spiral seal 12 right-hand member is located by check ring.
The sectional shape of high pressure resistant combination seal groove A, seal groove A that connecting ring 3 is identical with piston 9 being equipped with three is trapezoidal, and O RunddichtringO 17 is contained in the middle of seal groove A, and the equal symmetry in O RunddichtringO 17 both sides is equipped with wedge-type seal circle 15 and backup seal ring 16.
Pressure cylinder sleeve 8 left end outer surface is processed into wedge shape between safety valve 6.
The contact distance of piston 9 inner headed face and the axis of guide 14 is greater than the contact distance of piston 9 and pressure cylinder sleeve 8.
The present invention has the following advantages:
(1) the present invention is that the axis of guide leaves adequate space around the swing of guiding joint freedom and flexibility, and make the axis of guide comparatively be easy to reach the inclination maximum of designing requirement, sealing mechanism does not produce space constraint to it.
(2) the present invention adopts combined seal ring to design, organic cooperation of wedge shape section metal o-ring, rectangular seal, O type circle, enhance the tolerance of seal ring to down-hole high pressure, reduce the seal ring produced because of pressure difference and lost efficacy, improve the operating life of sealing configuration.
(3) present invention employs the design method that pressure compensation mechanism coordinates other seal elements, pressure compensation mechanism is made up of pressure cylinder sleeve 8, piston 9, spring 10, safety valve 6, one-way valve 7.Pressure cylinder sleeve left end and metal sealing bellows-welding, pressure cylinder sleeve two ends outer surface is processed into wedge shape, and there are safety valve and one-way valve in pressure cylinder sleeve left end place.Piston sleeve is on the axis of guide, and in piston, circle cross-section is slightly longer than outer circle cross-section, and piston inner hole and outer surface have groove, and the layout of each seal ring is arranged identical with connecting ring groove seal ring.Piston right-hand member welding spring, spring right-hand member is connected to spiral seal left end.Effectively reduce the pressure difference of both sides, seal interface, reduce the destruction that other seal elements cause because of high pressure difference, decrease leakage rate.
Accompanying drawing explanation
Fig. 1 is combined sealing structure schematic diagram.
Fig. 2 is seal ring composite structure schematic diagram.
In figure: 1 rotary sleeve, 2 guiding joints, 3 connecting rings, 4 metal sealing bellowss, 5 stuffing box glands, 6 safety valves, 7 one-way valves, 8 pressure cylinder sleeves, 9 pistons, 10 springs, 11 spiral seals, 12 elasticity gauzes, 13 check rings, 14 axis of guides, 15 wedge-type seal circles, 16 backup seal rings, 17O type circle.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail.
With reference to Fig. 1, a kind of with pressure compensated combined sealing structure, be applicable to pivoted down-hole rotary steering drilling tool (controllable bent joint), comprise connecting ring 3, connecting ring 3 loads the left end of stuffing box gland 5 by interference fit, the right-hand member of connecting ring 3 and the left end of metal sealing bellows 4 weld together, and the right-hand member of metal sealing bellows 4 is welded on the left end of pressure cylinder sleeve 8; Pressure cylinder sleeve 8 high order end is provided with safety valve 6, the right of safety valve 6 is provided with one-way valve 7, pressure cylinder sleeve 8 inside and piston 9 interference fit, with the axis of guide 14 interference fit while of piston 9, the right side place of piston 9 welds with the left end of spring 10, and the right-hand member of spring 10 is welded on the left side place of spiral seal 12.Spiral seal 12 is enclosed within the axis of guide 14 by interference fit, and spiral seal 12 right-hand member is located by check ring.
With reference to Fig. 2, the high pressure resistant combination seal groove A that connecting ring 3 is identical with piston 9 being equipped with three, the sectional shape of seal groove A is trapezoidal, and O RunddichtringO 17 is contained in the middle of seal groove A, and the equal symmetry in O RunddichtringO 17 both sides is equipped with wedge-type seal circle 15 and backup seal ring 16.When regulating sealing surface pressure at both sides, piston 9 can move around along the axis of guide 14, and piston 9 inside and outside circle place is all main pressure-bearing surface and leakage way, therefore needs high pressure sealing.
Pressure cylinder sleeve 8 left end outer surface is processed into wedge shape between safety valve 6, produces downthrust to prevent pressure cylinder sleeve 8 and stuffing box gland 5 when the bending deflection of metal sealing bellows.
The contact distance of piston 9 inner headed face and the axis of guide 14 is greater than the contact distance of piston 9 and pressure cylinder sleeve 8; In order to increase servo-actuated compensatory when the axis of guide 14 frequent swing of piston 9.
Working principle of the present invention: controllable bent joint is when vertically creeping into, and the axis of guide 14 and rotary sleeve are in same axis, the high pressure resistance sealing structure at connecting ring 3 place and piston 9 and spiral seal play main seal effect.The drilling fluid that connecting ring 3 main seal is entered by the axis of guide 14 activity space and inner lubricant oil, spiral seal 12 and piston 9 seal the drilling fluid and internal lubrication oil that are entered by the gap of spiral seal 12 structure jointly, and are filtered the solid particle in drilling fluid by spiral seal 12.
Controllable bent joint is when guide digging, by the plastic deformation of metal sealing bellows 4, sealing configuration is made to produce pendulum angle with the axis of guide, and ensure the stability of connecting ring 3 and pressure balance mechanism, reduce the floating elastic requirement to seal ring, decreasing fretting wear destroys, improve overall performance, in addition, certain damping, buffering effect is also played in the axial deformation of spring 10 and metal sealing bellows 4, is also very favorable to maintenance the relatively stable of high pressure sealing face.Elasticity gauze 12 has good servo-actuated compensatory, can make up the gap that the axis of guide produces when beat in time, and effectively filters the solid particle in drilling fluid, prevents solids particles precipitate from hindering the swing of the axis of guide.
In whole guide digging process, pressure compensation mechanism makes respective change to downhole drill hydraulic coupling all constantly, remains within designing requirement, improve sealing configuration life-span and performance by the mobile sealing configuration pressure at both sides difference that regulates of piston 9.

Claims (4)

1. one kind with pressure compensated combined sealing structure, be applicable to pivoted down-hole rotary steering drilling tool, it is characterized in that, comprise connecting ring (3), connecting ring (3) loads the left end of stuffing box gland (5) by interference fit, the right-hand member of connecting ring (3) and the left end of metal sealing bellows (4) weld together, and the right-hand member of metal sealing bellows (4) is welded on the left end of pressure cylinder sleeve (8), pressure cylinder sleeve (8) high order end is provided with safety valve (6), the right of safety valve (6) is provided with one-way valve (7), pressure cylinder sleeve (8) inside and piston (9) interference fit, with the axis of guide (14) interference fit the while of piston (9), the right side place of piston (9) welds with the left end of spring (10), the right-hand member of spring (10) is welded on the left side place of spiral seal (12), spiral seal (12) is enclosed within the axis of guide (14) by interference fit, and spiral seal (12) right-hand member is located by check ring.
2. one according to claim 1 is with pressure compensated combined sealing structure, it is characterized in that, the high pressure resistant combination seal groove (A) that connecting ring (3) is identical with piston (9) being equipped with three, the sectional shape of seal groove (A) is trapezoidal, O RunddichtringO (17) is contained in the middle of seal groove (A), and the equal symmetry in O RunddichtringO (17) both sides is equipped with wedge-type seal circle (15) and backup seal ring (16).
3. one according to claim 1 is with pressure compensated combined sealing structure, it is characterized in that, pressure cylinder sleeve (8) left end outer surface is processed into wedge shape between safety valve (6).
4. one according to claim 1 is with pressure compensated combined sealing structure, it is characterized in that, the contact distance of piston (9) inner headed face and the axis of guide (14) is greater than the contact distance of piston (9) and pressure cylinder sleeve (8).
CN201510864697.1A 2015-11-30 2015-11-30 One kind carries pressure compensated combined sealing structure Active CN105333156B (en)

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Application Number Priority Date Filing Date Title
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CN105333156B CN105333156B (en) 2017-08-25

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN111971495A (en) * 2018-04-04 2020-11-20 法国原子能源和替代能源委员会 Metal seal assembly for sealing between rotating shaft and stationary frame
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
CN113622833A (en) * 2021-08-11 2021-11-09 中国石油大学(华东) Underground oil pressure compensation dynamic sealing device and method based on corrugated pipe

Citations (5)

* Cited by examiner, † Cited by third party
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
CN101696729A (en) * 2009-11-12 2010-04-21 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

Patent Citations (5)

* Cited by examiner, † Cited by third party
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
CN101696729A (en) * 2009-11-12 2010-04-21 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

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111971495A (en) * 2018-04-04 2020-11-20 法国原子能源和替代能源委员会 Metal seal assembly for sealing between rotating shaft and stationary 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
CN113622833A (en) * 2021-08-11 2021-11-09 中国石油大学(华东) Underground oil pressure compensation dynamic sealing device and method based on corrugated pipe
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

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