CN107448154A - A kind of air-tight seal screw joint - Google Patents
A kind of air-tight seal screw joint Download PDFInfo
- Publication number
- CN107448154A CN107448154A CN201710616509.2A CN201710616509A CN107448154A CN 107448154 A CN107448154 A CN 107448154A CN 201710616509 A CN201710616509 A CN 201710616509A CN 107448154 A CN107448154 A CN 107448154A
- Authority
- CN
- China
- Prior art keywords
- box
- pin thread
- thread
- radius sphere
- 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.)
- Pending
Links
- 238000007789 sealing Methods 0.000 claims abstract description 41
- 230000007704 transition Effects 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000007906 compression Methods 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 210000002445 nipple Anatomy 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
Landscapes
- 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)
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
Abstract
A kind of air-tight seal screw joint provided by the invention, including box and pin thread.Wherein, box internal thread, box large radius sphere, box minor radius sphere, step in box are provided with the box, pin thread external screw thread, pin thread sealing cone, pin thread outer step are provided with the pin thread.The box and the pin thread are tightly engaged by the box internal thread and the pin thread external screw thread, the box large radius sphere is interference fitted with the pin thread sealing cone and the box minor radius sphere and the pin thread sealing cone interference fits, so that the box and the pin thread are in close contact.The present invention can be suitable for that HTHP and thermal production well, can overcome material in the case of a high temperature because material produces the problem of creep causes seal failure.
Description
Technical field
The present invention relates to a kind of nipple, and in particular to a kind of air-tight seal screw joint.
Background technology
In recent years, progressively exhausted with the oil gas well production of easy production zone, the exploration exploitation of Oil/gas Well faces geology feelings
Condition becomes increasingly complex, exploits the problem of difficulty is increasing, thus the technology such as the sealing property to tube connector, incompressible intensity
It is required that also more and more higher.
Existing API (American Petroleum Institute) nipples and other various Premium connections in the design process, do not have
The mechanical property of material is given full play to, this also allows for the feelings that Oil/gas Well tubing manufacturing company meets onsite application requirement in design
Under condition, more excellent and reliable special thread Pipe joint is developed using the mechanical property of material as far as possible.
The content of the invention
The purpose of the present invention is to overcome the deficiencies in the prior art, there is provided a kind of air-tight seal screw joint, this connects
Head resistance to compression is strong, is particularly suitable for use in HTHP and thermal production well, can overcome material in the case of a high temperature due to material
Material produces the problem of creep causes seal failure.
In order to solve the above technical problems, the present invention provides a kind of air-tight seal screw joint, including box and pin thread.Wherein,
Box internal thread, box large radius sphere, box minor radius sphere, step in box, the pin thread are provided with the box
On be provided with pin thread external screw thread, pin thread sealing cone, pin thread outer step.The box and the pin thread pass through spiral shell in the box
Line and the pin thread external screw thread tightly engage, the box large radius sphere is interference fitted with the pin thread sealing cone and institute
Box minor radius sphere and the pin thread sealing cone interference fits are stated, so that the box and the pin thread are closely connect
Touch.
The box large radius sphere and the pin thread sealing cone interference fit amount of interference between 0.4~0.6mm,
The amount of interference of box minor radius sphere and pin thread the sealing cone interference fits is between -0.01~0.1mm.
Smooth arc smooth transition is used between the box large radius sphere and the box minor radius sphere.
Angle between the pin thread sealing cone and horizontal plane is pin thread sealed taper face angle, the pin thread sealed taper face angle
Scope between 12~16 °.
Step and the angle of the pin thread outer step and vertical plane are respectively step angle and pin thread in box in the box
Outer step angle, the scope at step angle and the pin thread outer step angle is all between 10~20 ° in the box.
Circular arc in the box at step and internal wall transitions is in step-shaped top point circular arc in the box and the box
The arc radius of step-shaped top point circular arc is 0.5mm, and the pin thread outer step and the circular arc of outer wall transition position are pin thread outer step top
The arc radius of point circular arc and the pin thread outer step summit circular arc is 0.6mm.
The beneficial effect that the present invention is brought：The present invention at joint sealing by taking the box large radius sphere and institute
State pin thread sealing cone interference fit, and the box minor radius sphere and double guarantors of the pin thread sealing cone interference fits
Danger sealing, even if in the case that box large radius sphere causes seal failure because of generation plastic deformation, box minor radius sphere is still
Sealing property expected from keeping.And because box large radius sphere is plastically deformed, compressive property is increased on the contrary, from
And increase the entire compression contracting load-carrying ability of the joint.
Brief description of the drawings
Fig. 1 is a kind of integrally-built sectional view of air-tight seal screw joint according to embodiments of the present invention.
Fig. 2 is the mplifying structure schematic diagram of I in Fig. 1 according to embodiments of the present invention.
Fig. 3 is that a kind of structure for amplifying of the box internal thread root of air-tight seal screw joint according to embodiments of the present invention shows
It is intended to.
Fig. 4 is that a kind of structure for amplifying of the pin thread male threaded end of air-tight seal screw joint according to embodiments of the present invention shows
It is intended to.
In figure, A- boxes, B- pin threads, 1- box large radius spheres, 2- box minor radius spheres, the smooth circular arcs of 3-, 4- mothers
Detain internal thread, 5- pin thread external screw threads, 6- pin thread sealing cones, 7- pin thread outer steps, step in 8- boxes, step-shaped top in 9- boxes
Point circular arc, 10- pin thread outer steps summit circular arc, α-pin thread sealed taper face angle, θ1Step angle, θ in-box2- pin thread outer step angle.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with drawings and the specific embodiments, to this
Invention is described in further detail.
Fig. 1 is a kind of integrally-built sectional view of air-tight seal screw joint according to embodiments of the present invention.Fig. 2 is basis
I mplifying structure schematic diagram in Fig. 1 of the embodiment of the present invention.Fig. 3 is that a kind of hermetic seal screw thread according to embodiments of the present invention connects
The mplifying structure schematic diagram of the box internal thread root of head.Fig. 4 is a kind of air-tight seal screw joint according to embodiments of the present invention
Pin thread male threaded end mplifying structure schematic diagram.
Please merge with reference to figure 1, Fig. 2, Fig. 3 and Fig. 4, a kind of air-tight seal screw joint provided by the invention, including box A and
Pin thread B.Wherein, box internal thread 4, box large radius sphere 1, box minor radius sphere 2, box are provided with the box A
Interior step 8, pin thread external screw thread 5, pin thread sealing cone 6, pin thread outer step 7 are provided with the pin thread B.The box A and institute
State pin thread B tightly engaged by the box internal thread 4 and the pin thread external screw thread 5, the box large radius sphere 1 with it is described
Pin thread sealing cone 6 is interference fitted and the box minor radius sphere 2 and the interference fits of pin thread sealing cone 6, so that
The box A and the pin thread B are in close contact.With hydraulic tongs according to the torque value of setting by the pin thread B and described
Box A is connected, until the pin thread outer step 7 is touched in the box untill step 8.Now, the box is more than half
Footpath sphere 1 is formed with the pin thread sealing cone 6 and is interference fitted, the box minor radius sphere 2 and the pin thread sealing cone 6
Interference fits are formed, to reach expected gas sealing ability requirement.The pin thread sealing cone 6 that the pin thread B is set and the mother
Detain A box large radius sphere 1 and the different fit system of box minor radius sphere 2 so that when joint bear high temperature or
During the combined load of high pressure or even thermal force and axial high pressure, although the box large radius sphere 1 is due to deforming excessive cause
Seal failure, but the box minor radius sphere 2 is further converted into being interference fitted under load effect by interference fits, so as to
Ensure that the joint remains in that original gas sealing ability.
Furthermore, it is understood that the box large radius sphere 1 and the amount of interference of the pin thread sealing cone 6 interference fit exist
Between 0.4~0.6mm, the amount of interference of the box minor radius sphere 2 and the interference fits of pin thread sealing cone 6-0.01~
Between 0.1mm.The smooth rounding off of circular arc 3 is used between the box large radius sphere 1 and the box minor radius sphere 2,
Caused by can so avoiding between the box large radius sphere 1, the box minor radius sphere 2 and pin thread sealing cone 6
The problem of stress concentration.
In the present embodiment, the angle between the pin thread sealing cone 6 and horizontal plane is pin thread sealed taper face angle α, institute
Pin thread sealed taper face angle α scope is stated between 12~16 °.Step 8 and the pin thread outer step 7 and vertical plane in the box
Angle be respectively step angle θ in box1With pin thread outer step angle θ2, step angle θ in the box1With the pin thread outer step
Angle θ2Scope all between 10~20 °.Step 8 and the circular arc at internal wall transitions are step-shaped top in the box in the box
The arc radius of step-shaped top point circular arc 9 is 0.5mm, the pin thread outer step 7 and outer wall transition position in point circular arc 9 and the box
Circular arc be that the arc radius of pin thread outer step summit circular arc 10 and the pin thread outer step summit circular arc 10 is 0.6mm, and institute
The radian for stating step-shaped top point circular arc 9 in box is less than the pin thread outer step summit circular arc 10.
When using a kind of air-tight seal screw joint provided by the invention, pin thread B is first inserted in box A by make-up device,
2 circle left and right are first screwed in using the slow-speed of revolution after hitch, then screwed in using the rotating speed of 15 circles left and right per minute until last 1~2 circle
When, it is further threaded into the rotating speed per minute less than 5 circles to precalculated position.When joint bears thermal force or axial high compression loads
When, the box large radius sphere 1 produces plastic deformation and is in relaxed state first, so also cannot be close with the pin thread
Seal the contact of the conical surface 6 and produce enough contact stress.Now the box minor radius sphere 2 with the pin thread sealing cone 6 by firm
The interference fits of beginning are converted into interference fit, so as to ensure the sealing property of the joint.The box large radius sphere 1 simultaneously
Contacted by just with the line face of the pin thread sealing cone 6 and be converted into plane-plane contact, and the area of box large radius sphere 1
The material in domain is in the yield strength stage, and anti-compression properties substantially increase, so as to considerably increase the anti-axially pressure of integral joint
Contracting load performance.
In summary, the present invention at joint sealing by taking the box large radius sphere and the pin thread sealed taper
Face is interference fitted, and the box minor radius sphere and the Double-insurance sealing of the pin thread sealing cone interference fits, even if
In the case that box large radius sphere causes seal failure because of generation plastic deformation, box minor radius sphere is remained to expected from holding
Sealing property.And because box large radius sphere is plastically deformed, compressive property is increased on the contrary, so as to increase the joint
Entire compression contracting load-carrying ability.
Embodiments of the invention are the foregoing is only, are not intended to limit the invention, for those skilled in the art
For member, the present invention can have various modifications and variations.Any modification within the spirit and principles of the invention, being made,
Equivalent substitution, improvement etc., should be included within scope of the presently claimed invention.
Claims (6)
1. a kind of air-tight seal screw joint, including box (A) and pin thread (B), it is characterised in that be provided with the box (A)
Box internal thread (4), box large radius sphere (1), box minor radius sphere (2), step (8) in box, on the pin thread (B)
Pin thread external screw thread (5), pin thread sealing cone (6), pin thread outer step (7) are provided with, the box (A) and the pin thread (B) are logical
Cross the box internal thread (4) and the pin thread external screw thread (5) tightly engage, the box large radius sphere (1) and the public affairs
Sealing cone (6) interference fit and the box minor radius sphere (2) and pin thread sealing cone (6) interference fits are detained,
So that the box (A) and the pin thread (B) are in close contact.
A kind of 2. air-tight seal screw joint as claimed in claim 1, it is characterised in that the box large radius sphere (1) with
The amount of interference of pin thread sealing cone (6) interference fit is between 0.4~0.6mm, the box minor radius sphere (2) and public affairs
The amount of interference of sealing cone (6) interference fits is detained between -0.01~0.1mm.
A kind of 3. air-tight seal screw joint as claimed in claim 1, it is characterised in that the box large radius sphere (1) and
Smooth circular arc (3) rounding off is used between the box minor radius sphere (2).
4. a kind of air-tight seal screw joint as claimed in claim 1, it is characterised in that the pin thread sealing cone (6) and water
Angle between plane is pin thread sealed taper face angle (α), and the scope of the pin thread sealed taper face angle (α) is between 12~16 °.
A kind of 5. air-tight seal screw joint as claimed in claim 1, it is characterised in that step (8) and described in the box
Pin thread outer step (7) and the angle of vertical plane are respectively step angle (θ in box1) and pin thread outer step angle (θ2), in the box
Step angle (θ1) and the pin thread outer step angle (θ2) scope all between 10~20 °.
6. a kind of air-tight seal screw joint as claimed in claim 1, it is characterised in that step (8) and inwall in the box
The circular arc of transition position is the arc radius of step-shaped top point circular arc (9) in step-shaped top point circular arc (9) and the box in the box
For 0.5mm, the pin thread outer step (7) and the circular arc of outer wall transition position are pin thread outer step summit circular arc (10) and the pin thread
The arc radius of outer step summit circular arc (10) is 0.6mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710616509.2A CN107448154A (en) | 2017-07-26 | 2017-07-26 | A kind of air-tight seal screw joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710616509.2A CN107448154A (en) | 2017-07-26 | 2017-07-26 | A kind of air-tight seal screw joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107448154A true CN107448154A (en) | 2017-12-08 |
Family
ID=60488203
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710616509.2A Pending CN107448154A (en) | 2017-07-26 | 2017-07-26 | A kind of air-tight seal screw joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107448154A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108716369A (en) * | 2018-06-28 | 2018-10-30 | 无锡西姆莱斯石油专用管制造有限公司 | A kind of casing thread connection of multi-sealed hook-type screw thread |
| CN108868658A (en) * | 2018-06-28 | 2018-11-23 | 无锡西姆莱斯石油专用管制造有限公司 | A kind of casing thread connection with multi-sealed face screw thread positive-angle |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104373057A (en) * | 2014-11-28 | 2015-02-25 | 中国石油天然气集团公司 | Gas seal threaded connector casing pipe for low-pressure gas field horizontal well |
| CN105672904A (en) * | 2016-04-01 | 2016-06-15 | 西南石油大学 | Directly-connected hermetically sealed sleeve for high temperature and high pressure ultra-deep well |
| CN205532355U (en) * | 2015-11-16 | 2016-08-31 | 宝鸡石油钢管有限责任公司 | Low pressure hyposmosis is special screwed joint structure of sleeve pipe for gas well |
| CN105927167A (en) * | 2016-06-21 | 2016-09-07 | 西南石油大学 | Special-thread gas seal oil sleeve joint for ultra-deep wells |
-
2017
- 2017-07-26 CN CN201710616509.2A patent/CN107448154A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104373057A (en) * | 2014-11-28 | 2015-02-25 | 中国石油天然气集团公司 | Gas seal threaded connector casing pipe for low-pressure gas field horizontal well |
| CN205532355U (en) * | 2015-11-16 | 2016-08-31 | 宝鸡石油钢管有限责任公司 | Low pressure hyposmosis is special screwed joint structure of sleeve pipe for gas well |
| CN105672904A (en) * | 2016-04-01 | 2016-06-15 | 西南石油大学 | Directly-connected hermetically sealed sleeve for high temperature and high pressure ultra-deep well |
| CN105927167A (en) * | 2016-06-21 | 2016-09-07 | 西南石油大学 | Special-thread gas seal oil sleeve joint for ultra-deep wells |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108716369A (en) * | 2018-06-28 | 2018-10-30 | 无锡西姆莱斯石油专用管制造有限公司 | A kind of casing thread connection of multi-sealed hook-type screw thread |
| CN108868658A (en) * | 2018-06-28 | 2018-11-23 | 无锡西姆莱斯石油专用管制造有限公司 | A kind of casing thread connection with multi-sealed face screw thread positive-angle |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| AD01 | Patent right deemed abandoned | ||
| AD01 | Patent right deemed abandoned |
Effective date of abandoning: 20240315 |