CN109209254A - A kind of shale gas well Special threading connector - Google Patents
A kind of shale gas well Special threading connector Download PDFInfo
- Publication number
- CN109209254A CN109209254A CN201811373472.6A CN201811373472A CN109209254A CN 109209254 A CN109209254 A CN 109209254A CN 201811373472 A CN201811373472 A CN 201811373472A CN 109209254 A CN109209254 A CN 109209254A
- Authority
- CN
- China
- Prior art keywords
- box cupling
- tube body
- screw thread
- sealing
- sealing cone
- 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.)
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Classifications
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/08—Casing joints
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a kind of shale gas well Special threading connectors, including box cupling and tube body two parts, box cupling successively includes internal screw thread, escape, oil storage tank, box cupling sealing structure and box cupling torque resistant shoulder along axial direction, and tube body successively includes putting down in external screw thread, tube body sealing structure, tube body torque resistant end face and pipe end along axial direction；Box cupling sealing structure includes box cupling sealing cambered surface and box cupling sealing cone, and tube body sealing structure includes tube body sealing cone, and box cupling sealing cambered surface and box cupling sealing cone correspond to the main seal structure that tube body sealing cone is Special threading connector.Primary seal point is relatively distant from box cupling torque resistant shoulder, effectively prevents the destruction of use process middle tube body internal gas or liquid to sealing structure integrality；It is maximum interference position that box cupling, which seals cambered surface and the excessive place of box cupling sealing cone, guarantees that the length stabilisation of maximum interference position in 1mm~3mm, effectively prevents big load to impact the influence to sealing structure integrality in this way.
Description
Technical field:
The invention belongs to oil well pipe thread jointings, and in particular to a kind of shale gas well Special threading connector.
Background technique:
With the development of China Petroleum, the oil/gas well of the harsh working condition such as shale gas well, hyperbar well in recent years
Develop more and more, these special hole conditions are higher and higher to the Quality and property requirement of petroleum pipe, especially resist big compressibility
Can, this to tubing and casing weak link --- more stringent requirements are proposed for the performance of thread connecting joint.However, traditional API
Connector is difficult to meet the requirements, although common Special threading connector is met the requirements in terms of being threadedly coupled intensity, pressure resistance, resists big pressure
Contracting performance is insufficient.For this reason, it may be necessary to a kind of anti-big compression, high leakproofness, easy to process, structurally simple, economical be developed, suitable for page
The Special threading connector of rock gas well hole condition.
Notification number is 105927167 B of CN, a kind of entitled special thread hermetic seal tubing and casing spiral shell for ultradeep well
Line, by the conical surface and the conical surface, the conical surface and spherical surface progress two-stage sealing, the structure of Special threading connector of the present invention and the patent is not
Together, seal form is also different.
Summary of the invention:
It is an object of the invention to overcome the above-mentioned prior art, a kind of shale gas well is provided and is connect with special thread
Head, the Special threading connector are not only simple in structure, and are easy to be machined, and have the performance for resisting big compression and macrobending,
Tubing string nipple integrality and sealing structure at high angle hole and horizontal well are complete during solving shale gas well development
The problem of property.
The purpose of the present invention is by the following technical programs to solve: a kind of shale gas well Special threading connector, packet
Box cupling and tube body two parts are included, box cupling successively includes internal screw thread, escape, oil storage tank, box cupling sealing structure and box cupling along axial direction
Torque resistant shoulder, tube body successively include putting down in external screw thread, tube body sealing structure, tube body torque resistant end face and pipe end along axial direction；It connects
Hoop sealing structure includes box cupling sealing cambered surface and box cupling sealing cone, tube body sealing structure include tube body sealing cone, and box cupling is close
Envelope cambered surface and box cupling sealing cone correspond to the main seal structure that tube body sealing cone is Special threading connector.
Advantageous effect of the invention is:
1, main seal structure of the present invention corresponds to the mistake of tube body sealing cone using box cupling sealing cambered surface and box cupling sealing cone
Be full of sealing means, primary seal point is relatively distant from box cupling torque resistant shoulder, effectively prevent use process middle tube body internal gas or
Destruction of the liquid to sealing structure integrality；It is maximum interference position that box cupling, which seals cambered surface and the excessive place of box cupling sealing cone,
The length stabilisation of maximum interference position be ensure that in 1mm~3mm, effectively prevent big load impact complete to sealing structure in this way
The influence of property.
2, escape of the present invention is connect with oil storage tank, is not only contributed to withdrawing in box cupling processing, is more advantageous to bidentate knife and adds
Work promotes processing efficiency, reduces knife damage, saves economical, it is thus also avoided that incomplete thread thread gluing in upper shackle process.In addition withdrawing
Slot is connect with oil storage tank, forms larger space, and oil storage performance improves, and can effectively prevent thread compound using excessive to helicitic texture
With the influence of sealing structure.
Detailed description of the invention:
Fig. 1 is the structural schematic diagram after Special threading connector of the present invention engagement.
Fig. 2 is the partial enlargement diagram in Fig. 1 at sealing.
Fig. 3 is the structural schematic diagram of box cupling.
Fig. 4 is box cupling sealing structure partial enlargement diagram in Fig. 3.
Fig. 5 is the schematic diagram of tube body.
Fig. 6 is Fig. 5 middle tube body end partial enlargement diagram.
Fig. 7 is internal screw thread partial enlargement diagram in Fig. 3.
Fig. 8 is external screw thread partial enlargement diagram in Fig. 5.
Wherein, 1- box cupling, 2- tube body, 3- internal screw thread, 4- escape, 5- oil storage tank, 6- box cupling sealing structure, 7- box cupling are anti-
Torque shoulder, 8- external screw thread, 9- tube body sealing structure, 10- tube body torque resistant end face are put down in 11- pipe end, and 12- box cupling seals arc
Face, 13- box cupling sealing cone, 14- tube body sealing cone, the excessive conical surface of 15-, θ are the loading end angle of external screw thread and internal screw thread,
γ be external screw thread and internal screw thread guide surface angle, Δ δ be sealing structure maximum gauge magnitude of interference, α be box cupling sealing cone with
Tube body sealing cone angle, β are the angle of tube body torque resistant end face,For the frustoconical bevel angle of the excessive conical surface.
Specific embodiment:
The invention will be described in further detail with reference to the accompanying drawing:
Referring to Fig. 1 to Fig. 6, a kind of shale gas well Special threading connector, including 2 two parts of box cupling 1 and tube body, box cupling 1
It successively include internal screw thread 3, escape 4, oil storage tank 5, box cupling sealing structure 6 and box cupling torque resistant shoulder 7,2 edge of tube body along axial direction
Axial successively includes that 11 are put down in external screw thread 8, tube body sealing structure 9, tube body torque resistant end face 10 and pipe end；Box cupling sealing structure 6
Cambered surface 12 and box cupling sealing cone 13 are sealed including box cupling, tube body sealing structure 9 includes tube body sealing cone 14, and box cupling seals arc
Face 12 and the corresponding tube body sealing cone 14 of box cupling sealing cone 13 are the main seal structure of Special threading connector.
Main seal structure of the present invention is using box cupling sealing cambered surface 12 and the corresponding tube body sealing cone 14 of box cupling sealing cone 13
Interference seal mode, which is second level sealing of the invention and most important hermetic unit, not only makes to seal
Face is far from box cupling torque resistant shoulder 7, and the excessive place of box cupling sealing cone 13 and box cupling sealing cambered surface 12 is maximum interference position
Set, the design of box cupling sealing cone 13 and box cupling sealing cambered surface 12 ensure that the length stabilisation of maximum interference position 1mm~
3mm can effectively prevent influence of the big load impact to sealing integrity in this way.
As shown in Fig. 2, the taper of tube body sealing cone 14 of the present invention is 1:3~1:6, maximum gauge magnitude of interference Δ δ exists
In 0.40mm~0.1mm, the length of tube body sealing cone 14 is 3mm~6mm；Box cupling sealing cone 13 and tube body sealing cone 14
The range of angle α is 0.5 °~8 °.Box cupling sealing cone 13 and tube body sealing cone 14 form pre-contact area, resist part and contact
Load, can reduce on snap through damage of the journey to maximum interference position, avoid shackle sealing surface scratch failure.
As shown in Figure 7 and Figure 8, internal screw thread 3 and external screw thread 8 of the present invention are buttress thread, and loading end angle, θ is negative small angle
Degree, range are 1 °~3 °, and guide surface angle γ is 3 °~10 °.Before internal screw thread 3 and external screw thread 8 engage, internal screw thread 3 and outer spiral shell are given
Line 8 smears thread compound.Slope of thread interference, magnitude of interference are 0.02mm~0.10mm, prevent tube body and box cupling mutually sliding in this way
It is dynamic；After internal screw thread 3 and external screw thread 8 engage, there are gap, gap value is 0.02mm~0.10mm for crest and tooth bottom, is convenient for screw thread
Rouge flows during upper button, and thread side, crest, tooth bottom and thread compound form primary seal.
As shown in fig. 6, the end plane angle of box cupling torque resistant shoulder 7 is consistent with the angle beta of tube body torque resistant end face 10, it is
Negative angle, range are 3 °~10 °.It can guarantee under the action of positioning, anti-big compression, easy cleaning in this way, moreover it is possible to form third
Grade seals, and deduction of points power acts on tube body torque resistant end face on box cupling torque resistant shoulder, can reinforce sealing performance.
In order to avoid 2 end incomplete thread of tube body is too long, reduce incomplete thread thread gluing probability, external screw thread 8 of the present invention
End be equipped with the excessive conical surface 15, as shown in fig. 6, excessively the conical surface frustoconical bevel angleIt is 45 °~55 °.
A kind of shale gas well Special threading connector of the present invention, not only solves shale gas casing tubing string in vertical shaft, water
Thread integrity and sealing integrity problem when horizontal well receiving high compression, big stretching, macrobending load, and be highly resistant to
Shock loading is damaged when operation on well.In addition, escape 4 of the present invention is conducive to withdrawing in processing, and it is avoided that shackle process
Thread gluing occurs at middle incomplete thread, in addition escape 4 is connect with oil storage tank 5, is formed large space oil storage, can be effectively prevent spiral shell
Line rouge further improves special thread difficulty of processing using the excessive influence to helicitic texture and sealing structure, and screw thread of being more convenient for is double
Serrated knife processing, promotes processing efficiency.
Claims (6)
1. a kind of shale gas well Special threading connector, it is characterised in that: including box cupling (1) and tube body (2) two parts, box cupling
It (1) successively include internal screw thread (3), escape (4), oil storage tank (5), box cupling sealing structure (6) and box cupling torque resistant platform along axial direction
Shoulder (7), tube body (2) successively include external screw thread (8), tube body sealing structure (9), tube body torque resistant end face (10) and pipe end along axial direction
Interior flat (11)；Box cupling sealing structure (6) includes box cupling sealing cambered surface (12) and box cupling sealing cone (13), tube body sealing structure
It (9) include tube body sealing cone (14), box cupling seals cambered surface (12) and the corresponding tube body sealing cone of box cupling sealing cone (13)
It (14) is the main seal structure of Special threading connector.
2. a kind of shale gas well Special threading connector according to claim 1, it is characterised in that: box cupling sealing cone
(13) and maximum interference position is in the excessive place of box cupling sealing cambered surface (12), the length stabilisation of maximum interference position 1mm~
3mm。
3. a kind of shale gas well Special threading connector according to claim 2, it is characterised in that: tube body sealing cone
(14) taper is 1:3~1:6, and in 0.40mm~0.1mm, the length of tube body sealing cone (14) is maximum gauge magnitude of interference
3mm~6mm；The range of box cupling sealing cone (13) and tube body sealing cone (14) angle is 0.5 °~8 °.
4. a kind of shale gas well Special threading connector according to claim 1, it is characterised in that: internal screw thread (3) and outer
Screw thread (8) is buttress thread, and loading end angle is negative low-angle, and range is 1 °~3 °, and guide surface angle is 3 °~10 °；It is interior
The slope of thread interference of screw thread (3) and external screw thread (8), magnitude of interference are 0.02mm~0.10mm, internal screw thread (3) and external screw thread
(8) after engaging, there are gap, gap value is 0.02mm~0.10mm for crest and tooth bottom.
5. a kind of shale gas well Special threading connector according to claim 1, it is characterised in that: box cupling torque resistant shoulder
(7) end plane angle is consistent with the angle of tube body torque resistant end face (10), is negative angle, and range is 3 °~10 °.
6. a kind of shale gas well Special threading connector according to claim 1, it is characterised in that: the end of external screw thread (8)
Portion is equipped with the excessive conical surface (15), and the frustoconical bevel angle of the excessive conical surface is 45 °~55 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811373472.6A CN109209254A (en) | 2018-12-03 | 2018-12-03 | A kind of shale gas well Special threading connector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811373472.6A CN109209254A (en) | 2018-12-03 | 2018-12-03 | A kind of shale gas well Special threading connector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109209254A true CN109209254A (en) | 2019-01-15 |
Family
ID=64996538
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811373472.6A Pending CN109209254A (en) | 2018-12-03 | 2018-12-03 | A kind of shale gas well Special threading connector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109209254A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206158608U (en) * | 2016-11-02 | 2017-05-10 | 达力普石油专用管有限公司 | Special screwed joint of high temperature high pressure gas well oil expenses sleeve pipe |
| CN209067125U (en) * | 2018-11-19 | 2019-07-05 | 中国石油天然气集团有限公司 | A kind of shale gas well Special threading connector |
-
2018
- 2018-12-03 CN CN201811373472.6A patent/CN109209254A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206158608U (en) * | 2016-11-02 | 2017-05-10 | 达力普石油专用管有限公司 | Special screwed joint of high temperature high pressure gas well oil expenses sleeve pipe |
| CN209067125U (en) * | 2018-11-19 | 2019-07-05 | 中国石油天然气集团有限公司 | A kind of shale gas well Special threading connector |
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