CN103527110A - Multistage sealing anti-sticky buckle type thread for titanium alloy oil casing - Google Patents
Multistage sealing anti-sticky buckle type thread for titanium alloy oil casing Download PDFInfo
- Publication number
- CN103527110A CN103527110A CN201310430180.2A CN201310430180A CN103527110A CN 103527110 A CN103527110 A CN 103527110A CN 201310430180 A CN201310430180 A CN 201310430180A CN 103527110 A CN103527110 A CN 103527110A
- Authority
- CN
- China
- Prior art keywords
- thread
- oil casing
- screw thread
- titanium alloy
- sealing
- Prior art date
- 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.)
- Pending
Links
Images
Landscapes
- Earth Drilling (AREA)
Abstract
The invention relates to a multistage sealing anti-sticky buckle type thread for a titanium alloy oil casing. The multistage sealing anti-sticky buckle type thread comprises an oil casing coupling and an oil casing tube end, the oil casing coupling is provided with a standard API buttress internal thread which is sequentially connected with a tool withdrawal groove, a cone surface to cone surface first stage sealing structure, a cylinder surface to cylinder surface second stage sealing structure and a negative angle torque circular bead, wherein the cone surface to cone surface first stage sealing structure and the cylinder surface to cylinder surface second stage sealing structure are in transition through chambering, and the negative angle torque circular bead is connected with the standard API buttress internal thread through a transitional angle. The multistage sealing anti-sticky buckle type thread for the titanium alloy oil casing has the advantages that two stages of metal sealing and one negative angle torque circular bead sealing are added based on the improved buttress thread, the reliability of the air tightness of a thread connector is improved through the design of multistage sealing, meanwhile, the stress state of the thread connector is reduced by changing a thread parameter, the performance of an anti-sticky buckle is improved, and machining and detecting are convenient.
Description
Technical field
The present invention relates to industrial gas oil completion flow string connecting thread, particularly a kind of multi-stage sealed anti-stick button-type screw thread of a kind of titanium alloy oil annular tube using under high temperature pressure corrosion medium exists, to guarantee the safe and effective exploitation of Oil/gas Well.
Background technology
Along with further going deep into of natural petroleum gas field, many China western part and Southwest Oil have high temperature (being greater than 140 ℃), high pressure (being greater than 100MPa), well depth (being greater than 5000m) and contain high corrosive medium (CO
2, H
2s, CL-) etc. severe rugged environment, in order to adapt to the requirement to tubing and casing corrosion resistance in these oil-gas field developments, titanium alloy tube has been introduced into be manufactured tubing and casing and has very excellent performance performance.
In industrial gas oil development process, the tubing and casing adopting is to twist and connect the tubing string connecting to form with screw thread, screw thread is the weakest link in oil casing, and its structural integrity, sealing integrity and reliability have a strong impact on safety in production and the tubing string life-span in oil field.Common API screw thread is due to congenital deficiency in structure design own, cannot meet the sealing integrity in " three height " the oil gas field environment such as high temperature, high pressure, high corrosive medium content, very easily there is serious oil and gas leakage accident, owing to containing H in these oil gas
2the noxious materials such as S, bring great threat to oil gas safety and periphery ecological environment and people life property safety, simultaneously, it is low that titanium alloy material itself has modulus of elasticity, case hardness is low, the features such as the poor and coefficient of heat conduction of anti-wear performance is low, with titanium alloy material, process common API screw thread thread gluing phenomenon very easily occurs, the general special thread structure that the ferrous materials of take is basic engineering is not suitable for titanium alloy oil pipe yet, easily there is thread gluing and seal failure phenomenon, therefore for ensureing the security development of " three height " oil gas field, also further promote titanium alloy tubing and casing applying in oil and gas industry, be badly in need of a kind of structural integrity that has that aims at the use of titanium alloy helicitic texture, the screw thread of sealing performance and anti-stick button performance reliably.
Summary of the invention
The present invention is mainly in order to solve " three height " oil gas field security development problems such as high temperature, high pressure, high corrosive medium content, provide a kind of titanium alloy oil annular tube multi-stage sealed anti-stick button-type screw thread, use multi-stage sealed design to improve the hermetic seal unfailing performance of nipple, on box cupling, adopt taper mutation design, there is good anti-stick button performance simultaneously.
Technical solution of the present invention is: the multi-stage sealed anti-stick button-type screw thread of a kind of titanium alloy oil annular tube, comprise oil casing collar (1) and tubing and casing pipe end (2), oil casing collar (1) is provided with the inclined to one side trapezoidal internal thread of API (3) of standard, the inclined to one side trapezoidal internal thread tapering of API 1:16, what be connected with inclined to one side trapezoidal internal thread (3) is escape (13) successively, the conical surface by chamfering transition is to conical surface primary seal structure (8), cylinder is to cylinder secondary seal structure (7) and the negative angle torque shoulder (6) being connected by a transition chamfering, the conical surface is to conical surface primary seal structure internal screw line conical degree of conical surface 1:4～1:6, external screw thread conical degree of conical surface 1:6～1:9, cylinder is to cylinder secondary seal structure magnitude of interference 0.01mm～0.4mm, 8 °～17 ° of negative angle torque shoulder negative angles, tubing and casing pipe end (2) is provided with partially trapezoidal external screw thread (4), partially trapezoidal external screw thread (4) tapering 1:16, in oil casing collar (1) end, be provided with the inclined to one side trapezoidal internal thread of taper mutation API (5), tapering is 1:10～1:14, taper mutation starting point section is apart from box cupling end 20～30mm.
External screw thread crest (9) is parallel with the axis of tubing and casing, 0～3 ° of the normal angle of externally threaded bearing surface (10) and tubing string axis, chamfer radius between externally threaded bearing surface (10) and externally threaded crest (9) is 0.25～0.30mm, and the chamfer radius between externally threaded crest (9) and externally threaded spigot surface (11) is 0.8～1.0mm.
Advantage of the present invention is on improved buttress thread basis, to increase two-stage metal sealing and a negative angle torque shoulder sealing composition, by multi-stage sealed design, improve the hermetic seal unfailing performance of nipple, by changing thread parameter, reduce the stress state on nipple simultaneously, improve anti-stick button performance, processing letter is easy to detect.
The present invention by the rational conical surface to conical surface primary seal structure, the three grade metal to metal interference Seal Design of cylinder to cylinder secondary seal structure and the sealing of negative angle torque shoulder, make three grades of sealing position Interference contact pressure of nipple all lower than 80% of material yield intensity, reduced upper button process and sealing surface has been caused to the possibility of damage, make joint still have higher sealing reliability, when titanium alloy body Tensile load and inner pressuring load, the sealing performance of nipple is unaffected simultaneously.Simultaneously due to sealing surface position near screw initial thread end away from tube end, can provide good protection to sealing surface, prevent the accidental injury in handling process.
Owing to having adopted improved buttress thread tooth form design, guaranteeing has rational stress distribution on form of thread, effectively prevent that stress is concentrated, in the end of oil casing collar, there is one section of inclined to one side trapezoidal internal thread of API to adopt taper mutation design simultaneously, this taper mutation design has reduced contact and the stress of the large end of box cupling screw thread and has concentrated, above measure can effectively prevent that the thread gluing of titanium alloy tubing and casing from occurring, and makes the design's helicitic texture have good anti-stick button performance together.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is form of thread structural representation.
Fig. 3 is the interference sealing schematic diagram linking on joint after connecing.
The specific embodiment
Structural representation of the present invention is shown in Fig. 1.On tubing and casing pipe end 2, process improved partially trapezoidal external screw thread 4, the inclined to one side trapezoidal internal thread 3 of the API of processing criterion on oil casing collar 1, what be connected with inclined to one side trapezoidal internal thread 3 is escape 13, chaser withdrawing during for machining screw, on screw thread, after button, rise and store unnecessary thread compound simultaneously, reduce the negative effect of thread compound pressure butt joint sealing performance; With escape 13 by chamfering transition is that the conical surface is to conical surface primary seal structure 8, this is that pair of metal is to shape metallic leak-proof structure, joint gas sealing ability after button in assurance, what at the conical surface, conical surface primary seal structure 8 is connected below is that cylinder is to cylinder secondary seal structure 7, secondary seal structure 7 has metal to metal seal structure after detaining on screw thread, when nipple bears tensile load and inner pressuring load, still there is higher gas sealing ability, and the sealing performance of nipple is unaffected when titanium alloy body Tensile load and inner pressuring load; What with cylinder, cylinder secondary seal structure 7 is connected by a transition chamfering is negative angle torque shoulder 6, for controlling position on the buckle, have auxiliary three grades of sealing functions, reasonably negative angle design makes negative angle torque shoulder 6 still can keep auxiliary seal effect under certain tensile load effect simultaneously.
On tubing and casing pipe end 2, improved partially trapezoidal external screw thread 4 is all identical with API buttress thread with the tapering of the inclined to one side trapezoidal internal thread 3 of oil casing collar 1 API of last minute, tapering is 1:16, in the end of oil casing collar 1, there is one section of inclined to one side trapezoidal internal thread 5 of API to adopt taper mutation design, tapering is 1:10～1:14, taper mutation starting point section is apart from box cupling end 20～30mm, by taper mutation design, making the large end of internal thread (trapezoidal internal thread 5 partially) reduce stress concentrates, can effectively prevent that thread gluing from occurring.
In form of thread design, external screw thread 4 adopts improved API screw thread buttress thread, and as shown in Figure 2, externally threaded crest 9 is parallel with the axis of tubing and casing; At the bottom of externally threaded tooth, 12 is identical with standard A PI buttress thread.Externally threaded bearing surface 10 has adopted the bearing surface angle of optimizing.Chamfer dimesion between externally threaded bearing surface 10 and externally threaded crest 9, between externally threaded crest 9 and externally threaded spigot surface 11 is through redesigning, wherein the chamfer radius between externally threaded bearing surface 10 and externally threaded crest 9 is 0.25～0.30mm, chamfer radius between externally threaded crest 9 and externally threaded spigot surface 11 is 0.8～1.0mm, to guarantee to have on ridge, be reasonably full of power and distribute, effectively prevent that stress from concentrating and thread gluing.
Structural representation on nipple of the present invention after button is shown in Fig. 3.
Table 1 helicitic texture forms and dimensional requirement
Embodiment:
Can, according to the requirement of concrete operating mode, select the titanium alloy tubing and casing of different size.The processing of employing Digit Control Machine Tool, adds man-hour, first processes internal and external threads firsts and seconds sealing surface, then processes torque shoulder, finally reprocesses helicitic texture.
Embodiment mono-: processing external diameter Φ 88.9mm oil connection
Employing is with grade of steel box cupling and body, and 10um is thick in internal thread copper facing, external threaded surface peening.During upper button, API thread compound is evenly smeared at two ends, clamping box cupling, and factory's end adopts in peak torque to be detained, and on-the-spot end adopts in best torque to be detained.
Thread size requires:
External diameter Φ 88.9mm oil connection after processing is through verification experimental verification, and 9 upper shackles occur without thread gluing phenomenon, at axial load 890KN, during inner pressuring load 80MPa, without Leakage Gas, occur, and meet structural integrity, sealing integrity requirement.
Embodiment bis-: processing external diameter Φ 177.8mm casing joint
Employing is with grade of steel box cupling and body, and 15um is thick in internal thread copper facing, external threaded surface peening.During upper button, API thread compound is evenly smeared at two ends, clamping box cupling, and factory's end adopts in peak torque to be detained, and on-the-spot end adopts in best torque to be detained.
Thread size requires:
External diameter Φ 177.8mm titanium alloy casing joint after processing is through verification experimental verification, and 3 upper shackles occur without thread gluing phenomenon, at axial load 1100KN, during inner pressuring load 65MPa, without Leakage Gas, occur, and meet structural integrity, sealing integrity requirement.
Claims (2)
1. the multi-stage sealed anti-stick button-type screw thread of titanium alloy oil annular tube, comprise oil casing collar (1) and tubing and casing pipe end (2), oil casing collar (1) is provided with the inclined to one side trapezoidal internal thread of API (3) of standard, the inclined to one side trapezoidal internal thread tapering of API 1:16, what be connected with inclined to one side trapezoidal internal thread (3) is escape (13) successively, the conical surface by chamfering transition is to conical surface primary seal structure (8), cylinder is to cylinder secondary seal structure (7) and the negative angle torque shoulder (6) being connected by a transition chamfering, the conical surface is to conical surface primary seal structure internal screw line conical degree of conical surface 1:4～1:6, external screw thread conical degree of conical surface 1:6～1:9, cylinder is to cylinder secondary seal structure magnitude of interference 0.01mm～0.4mm, 8 °～17 ° of negative angle torque shoulder negative angles, tubing and casing pipe end (2) is provided with partially trapezoidal external screw thread (4), partially trapezoidal external screw thread (4) tapering 1:16, in oil casing collar (1) end, be provided with the inclined to one side trapezoidal internal thread of taper mutation API (5), tapering is 1:10～1:14, taper mutation starting point section is apart from box cupling end 20～30mm.
2. the multi-stage sealed anti-stick button-type screw thread of a kind of titanium alloy oil annular tube as claimed in claim 1, it is characterized in that: external screw thread crest (9) is parallel with the axis of tubing and casing, externally threaded bearing surface (10) is 0～3 ° with the normal angle of tubing string axis, chamfer radius between externally threaded bearing surface (10) and externally threaded crest (9) is 0.25～0.30mm, and the chamfer radius between externally threaded crest (9) and externally threaded spigot surface (11) is 0.8～1.0mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310430180.2A CN103527110A (en) | 2013-09-18 | 2013-09-18 | Multistage sealing anti-sticky buckle type thread for titanium alloy oil casing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310430180.2A CN103527110A (en) | 2013-09-18 | 2013-09-18 | Multistage sealing anti-sticky buckle type thread for titanium alloy oil casing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103527110A true CN103527110A (en) | 2014-01-22 |
Family
ID=49929419
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310430180.2A Pending CN103527110A (en) | 2013-09-18 | 2013-09-18 | Multistage sealing anti-sticky buckle type thread for titanium alloy oil casing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103527110A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104265190A (en) * | 2014-09-28 | 2015-01-07 | 天津德华石油装备制造有限公司 | TTGM-4 special thread structure oil casing coupling |
| CN105422018A (en) * | 2015-12-09 | 2016-03-23 | 中国石油集团石油管工程技术研究院 | High-leakproofness threaded connector for solid expansion pipe in large expansion rate |
| CN105422019A (en) * | 2015-12-09 | 2016-03-23 | 中国石油集团石油管工程技术研究院 | Rapid buckling threaded structure for expansion pipe in large expansion rate and machining and preparing method |
| CN105798401A (en) * | 2016-03-09 | 2016-07-27 | 中国海洋石油总公司 | Machining method for sleeve joint provided with high-strength torque threads |
| CN108518184A (en) * | 2018-03-26 | 2018-09-11 | 天津商业大学 | A kind of new Joining Structure of oil well pipe and box cupling |
| CN108798550A (en) * | 2018-07-23 | 2018-11-13 | 中国石油天然气集团公司管材研究所 | A kind of titanium alloy oil pipe anti-galling air-tight seal screw joint |
| CN109441368A (en) * | 2018-12-10 | 2019-03-08 | 衡阳华菱钢管有限公司 | Titanium alloy oil connection |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201187260Y (en) * | 2007-12-19 | 2009-01-28 | 宝山钢铁股份有限公司 | Casing tube screwed joint |
| CN101871327A (en) * | 2010-07-09 | 2010-10-27 | 天津钢管集团股份有限公司 | Variable conicity API (American Petroleum Institute) thread oil sleeve joint |
| CN201982024U (en) * | 2010-12-08 | 2011-09-21 | 中国石油集团石油管工程技术研究院 | Casing gas seal screwed nipples for gas well |
| CN102587845A (en) * | 2012-03-16 | 2012-07-18 | 西安摩尔石油工程实验室有限公司 | Air-sealing casing screwed connector interchangeable with API (American petroleum institute) round thread |
| CN102829269A (en) * | 2012-08-30 | 2012-12-19 | 中国石油天然气集团公司 | Special screwed joint for gas injection and production of underground gas storage |
| CN202645463U (en) * | 2012-05-17 | 2013-01-02 | 延安嘉盛石油机械有限责任公司 | Thread gluing resistant two-stage gas seal screwed joint |
-
2013
- 2013-09-18 CN CN201310430180.2A patent/CN103527110A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201187260Y (en) * | 2007-12-19 | 2009-01-28 | 宝山钢铁股份有限公司 | Casing tube screwed joint |
| CN101871327A (en) * | 2010-07-09 | 2010-10-27 | 天津钢管集团股份有限公司 | Variable conicity API (American Petroleum Institute) thread oil sleeve joint |
| CN201982024U (en) * | 2010-12-08 | 2011-09-21 | 中国石油集团石油管工程技术研究院 | Casing gas seal screwed nipples for gas well |
| CN102587845A (en) * | 2012-03-16 | 2012-07-18 | 西安摩尔石油工程实验室有限公司 | Air-sealing casing screwed connector interchangeable with API (American petroleum institute) round thread |
| CN202645463U (en) * | 2012-05-17 | 2013-01-02 | 延安嘉盛石油机械有限责任公司 | Thread gluing resistant two-stage gas seal screwed joint |
| CN102829269A (en) * | 2012-08-30 | 2012-12-19 | 中国石油天然气集团公司 | Special screwed joint for gas injection and production of underground gas storage |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104265190A (en) * | 2014-09-28 | 2015-01-07 | 天津德华石油装备制造有限公司 | TTGM-4 special thread structure oil casing coupling |
| CN105422018A (en) * | 2015-12-09 | 2016-03-23 | 中国石油集团石油管工程技术研究院 | High-leakproofness threaded connector for solid expansion pipe in large expansion rate |
| CN105422019A (en) * | 2015-12-09 | 2016-03-23 | 中国石油集团石油管工程技术研究院 | Rapid buckling threaded structure for expansion pipe in large expansion rate and machining and preparing method |
| CN105798401A (en) * | 2016-03-09 | 2016-07-27 | 中国海洋石油总公司 | Machining method for sleeve joint provided with high-strength torque threads |
| CN108518184A (en) * | 2018-03-26 | 2018-09-11 | 天津商业大学 | A kind of new Joining Structure of oil well pipe and box cupling |
| CN108798550A (en) * | 2018-07-23 | 2018-11-13 | 中国石油天然气集团公司管材研究所 | A kind of titanium alloy oil pipe anti-galling air-tight seal screw joint |
| CN109441368A (en) * | 2018-12-10 | 2019-03-08 | 衡阳华菱钢管有限公司 | Titanium alloy oil connection |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103628827B (en) | Anti-stick button three grades of end plane metal sealing titanium compo pipe nipples | |
| CN103527110A (en) | Multistage sealing anti-sticky buckle type thread for titanium alloy oil casing | |
| CN202946041U (en) | Zigzag air-sealed oil well pipe thread joint structure | |
| CN202380985U (en) | Tubular air seal thread joint | |
| CN203531777U (en) | High-quality airtight seal oil casing threaded joint | |
| CN101975034B (en) | Hermetic seal connecting structure for special buckle of oil casing | |
| CN108798550A (en) | A kind of titanium alloy oil pipe anti-galling air-tight seal screw joint | |
| CN101975035B (en) | Airtight seal connecting structure of special threaded buckle for oil sleeve pipe | |
| CN105422019A (en) | Rapid buckling threaded structure for expansion pipe in large expansion rate and machining and preparing method | |
| CN202954751U (en) | Thread casing pipe connector capable of being quickly screwed on and screwed off | |
| CN208777917U (en) | A kind of titanium alloy oil pipe anti-galling air-tight seal screw joint | |
| CN204703783U (en) | A kind of two-stage sealing special buckle of oil casing joint | |
| CN202039786U (en) | Connecting structure for high-pressure well completion oil pipe | |
| CN101899953A (en) | Thread joint structure for high-performance oil casing | |
| CN202090850U (en) | Pipeline connecting piece between thread and conical seal surface with limited circular bead | |
| CN201874485U (en) | Metal sealed casing threaded connecting structure based on API (American Petroleum Institute) standard round threads | |
| CN202081837U (en) | Stress-resistant threaded connector with corrosive gas sealing sleeve | |
| CN201875312U (en) | Lap welding branch pipe threaded joint sealed by O-shaped rubber sealing ring | |
| CN102011557B (en) | Special screw thread joint of high air-tight seal oil sleeve | |
| CN203403832U (en) | Air-tight seal screwed joint | |
| CN202176273U (en) | High-temperature high-pressure petroleum casing pipe thread connector | |
| CN203239244U (en) | Air-tight seal oil pipe screwed joint | |
| CN205259964U (en) | Big effective high leakproofness screwed joint of expansion rate lower excess volume expansion | |
| CN205012933U (en) | Airtight connection structure of anti thread gluing body of three circular beads | |
| CN211875339U (en) | Threaded structure of threaded joint of PVC-lined steel pipe |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140122 |