CN108716369A - A kind of casing thread connection of multi-sealed hook-type screw thread - Google Patents
A kind of casing thread connection of multi-sealed hook-type screw thread Download PDFInfo
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- CN108716369A CN108716369A CN201810683762.4A CN201810683762A CN108716369A CN 108716369 A CN108716369 A CN 108716369A CN 201810683762 A CN201810683762 A CN 201810683762A CN 108716369 A CN108716369 A CN 108716369A
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- China
- Prior art keywords
- thread
- pin
- female
- conical surface
- pin thread
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- 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
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- 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
Abstract
The present invention provides a kind of casing thread connection of multi-sealed hook-type screw thread, including female thread and pin thread, it is characterized in that, it is set gradually from left to right internal thread on the female thread, female thread spherical seal surface, female thread conical surface seal face, female thread torque shoulder face, it is set gradually from left to right external screw thread on the pin thread, pin thread cylindrical sealing surface, pin thread conical surface seal face, pin thread torque shoulder face, the female thread and the pin thread are meshed together by the internal thread and the external screw thread, the female thread spherical seal surface and the pin thread cylindrical sealing surface are in close contact, female thread conical surface seal face and pin thread conical surface seal face are in close contact, the pin thread sealed end inner surface is provided with cylindrical surface and circular conical surface, the cylindrical surface is close to pin thread torque shoulder face.Through the invention, to solve the problems, such as traditional sleeve connector of the existing technology seal failure under cycle of higher pressure load and the inside and outside high pressure load effect of pipe.
Description
Technical field
The present invention relates to a kind of casing thread connections, and in particular to a kind of casing threads of multi-sealed hook-type screw thread connects
Head.
Background technology
In recent years, various as the geological condition of the exhausted and new oil/gas well region of old oil/gas well is more complicated
The oil gas field of deep-well, directional well, horizontal well, as oil gas well mining difficulty, depth also become increasingly complex, the pressure of well is also more next
It is bigger.In this way to the safety of tubing string and leakproofness, especially leakproofness, performance requires also higher and higher.
At present during oil gas well mining, the petroleum casing pipe that oil field uses at present mostly is under the effect of cycle of higher pressure load
Tubing string nipple can usually fail, and cause prodigious economic loss to unit in charge of construction and Party A company in this way.
With the increase of drilling depth, along with complicated geological environment, the external pressure and internal pressure that tubing is born also are got over
Come bigger, this just needs casing joint that can also bear very high external pressure and internal pressure load.
The casing of multi-sealed thread negative angle degree is the upgrading to multi-sealed screw thread positive-angle casing, thread negative angle degree,
Also referred to as hook-type screw thread is suitable for the oil gas well drilling needs of deep-well, directional well, various horizontal wells, macrobending well section, mainly solves
The casing of Short Radius Horizontal Wells, super short radial horizontal well and macrobending well section bears the compound of bending+stretching+interior pressure and adds
It carries, the Dry-gas Sealing Technology problem of overload operation.
Invention content
The present invention provides a kind of casing thread connection of multi-sealed hook-type screw thread, to solve tradition of the existing technology
Casing joint is under cycle of higher pressure load and the inside and outside high pressure load effect of pipe the problem of seal failure.
In order to solve the above technical problems, the present invention provides a kind of casing thread connection of multi-sealed hook-type screw thread, including
Female thread and pin thread, be set gradually from left to right on the female thread internal thread, female thread spherical seal surface, female thread conical surface seal face,
Female thread torque shoulder face has been set gradually from left to right external screw thread, pin thread cylindrical sealing surface, pin thread conical surface seal on the pin thread
Face, pin thread torque shoulder face, the female thread and the pin thread are meshed together by the internal thread and the external screw thread, described
Female thread spherical seal surface and the pin thread cylindrical sealing surface are in close contact, and female thread conical surface seal face and the pin thread conical surface are close
Cover is in close contact, and female thread torque shoulder face and pin thread torque shoulder face are in close contact, in the pin thread sealed end
Surface is provided with cylindrical surface and circular conical surface, and the cylindrical surface is close to pin thread torque shoulder face, the pin thread cylindrical sealing surface
Pin thread conical transition is used between pin thread conical surface seal face.
The loading end angle beta of the internal thread2It is 0 °~-10 °, guide surface angle beta1It is 5 °~15 °, it is described externally threaded
Loading end angle beta3It is 0 °~-10 °, guide surface angle beta4It is 5 °~15 °.
The female thread spherical seal surface and pin thread cylindrical sealing surface interference fit, female thread conical surface seal face and pin thread cone
Face sealing surface is also interference fit, and interference volume is between 0.15~0.60mm.
Arc smooth transition is used between the female thread spherical seal surface and female thread conical surface seal face.
The radius of the circular arc is 0.3mm~1.0mm.
The spherical radius of the female thread spherical seal surface is 2.0mm~10mm.
The angle in female thread conical surface seal face is between 10 °~20 °, and the angle in pin thread conical surface seal face is at 10 °
Between~20 °.
Female thread torque shoulder face end set has -10 °~-20 ° of reversed chamfering α1, pin thread torque shoulder face
End set has -10 °~-20 ° of reversed chamfering α2。
The taper of the pin thread circular cone is 0 °~10 °, and the taper of the circular conical surface is 0 °~10 °.
The sealing nose length is 10mm~18mm.
The advantageous effect that the present invention is brought：Casing thread connection provided by the invention is spherical by the way that female thread is arranged on female thread
Pin thread cylindrical sealing surface, pin thread conical surface seal is arranged in sealing surface, female thread conical surface seal face, female thread torque shoulder face on pin thread
Face, pin thread torque shoulder face, male and female button are connected by the way that screw thread is ratcheting, until the circular bead surface of pin thread contacts the shoulder of female thread
Face, the sealing cone of pin thread and the female thread sealing surface conical surface, which are formed, at this time is interference fitted, and female thread seals spherical surface and pin thread is column sealed
Face forms interference fit, and multiple sealing surfaces are mutually independent of each other, and improve the sealing performance of casing, it is ensured that casing thread connection has
Relatively reliable sealing performance.The casing thread connection hermetic seal ability of multi-sealed face hook-type screw thread provided by the invention reaches
Inboard wall of tube body yield pressure.It is functional using hook-type screw thread tension+counter-bending+anti-internal pressure.Allow repeatedly upper, shackle and big torsion
Square operation is not easy thread gluing.
Description of the drawings
Fig. 1 is the overall structure diagram of the casing thread connection of the multi-sealed hook-type screw thread of the embodiment of the present invention.
Fig. 2 is the partial structurtes enlarged diagram of I in Fig. 1.
Fig. 3 is the partial structurtes enlarged diagram of female thread in Fig. 2.
Fig. 4 is the partial structurtes enlarged diagram of M in Fig. 3.
Fig. 5 is the partial structurtes enlarged diagram of pin thread in Fig. 2.
Fig. 6 is the partial structurtes enlarged diagram of N in Fig. 5.
Wherein, A- female threads, B- pin threads, 1- internal threads, 2- external screw threads, 3- female thread spherical seal surfaces, 4- pin thread cylindrical seals
Face, 5- circular arcs, 6- female thread conical surface seals face, 7- pin thread conical surface seals face, 10- female thread torque shoulders face, 11- pin thread torque shoulders
Face, 12- seal nose length, the cylindrical surfaces 13-, 14- circular conical surfaces, 15- pin thread circular cones.
Specific implementation mode
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 the overall structure signal of the casing thread connection of multi-sealed hook-type screw thread according to the ... of the embodiment of the present invention
Figure.
Fig. 2 is the partial structurtes enlarged diagram of I in Fig. 1.
Fig. 3 is the partial structurtes enlarged diagram of female thread in Fig. 2.
Fig. 4 is the partial structurtes enlarged diagram of M in Fig. 3.
Fig. 5 is the partial structurtes enlarged diagram of pin thread in Fig. 2.
Fig. 6 is the partial structurtes enlarged diagram of N in Fig. 5.
As shown in figures 1 to 6, the casing thread connection of multi-sealed hook-type screw thread provided by the invention, including female thread A and public affairs
B is detained, internal thread 1, female thread spherical seal surface 3, female thread conical surface seal face 6, female thread have been set gradually from left to right on the female thread A
Torque shoulder face 10 has been set gradually from left to right external screw thread 2 on the pin thread B, and pin thread cylindrical sealing surface 4, the pin thread conical surface are close
Cover 7, pin thread torque shoulder face 11, the female thread A and the pin thread B are engaged on by the internal thread 1 and the external screw thread 2
Together, the female thread spherical seal surface 3 and the pin thread cylindrical sealing surface 4 are in close contact, female thread conical surface seal face 6 and institute
The close contact of pin thread conical surface seal face 7 is stated, female thread torque shoulder face 10 and pin thread torque shoulder face 11 are in close contact,
The pin thread B sealed end inner surfaces are provided with cylindrical surface 13 and circular conical surface 14, and the cylindrical surface 13 is close to the pin thread torque platform
Shoulder face 11 uses 15 transition of pin thread circular cone between the pin thread cylindrical sealing surface 4 and pin thread conical surface seal face 7.
The loading end angle beta of the internal thread 12It is 0 °~-10 °, guide surface angle beta1It is 5 °~15 °, the external screw thread 2
Loading end angle beta3It is 0 °~-10 °, guide surface angle beta4It is 5 °~15 °.
The female thread spherical seal surface 3 and pin thread cylindrical sealing surface 4 are interference fitted, female thread conical surface seal face 6 and public affairs
It is also interference fit to detain conical surface seal face 7, and interference volume is between 0.15~0.60mm.
5 rounding off of circular arc is used between the female thread spherical seal surface 3 and female thread conical surface seal face 6.
The radius of the circular arc 5 is 0.3mm~1.0mm.
The spherical radius of the female thread spherical seal surface 3 is 2.0mm~10mm.
Between 10 °~20 °, the angle in pin thread conical surface seal face 7 exists the angle in female thread conical surface seal face 6
Between 10 °~20 °.
10 end set of female thread torque shoulder face has -10 °~-20 ° of reversed chamfering α1, the pin thread torque shoulder
11 end set of face has -10 °~-20 ° of reversed chamfering α2。
The taper of the pin thread circular cone 15 is 0 °~10 °, and the taper of the circular conical surface 14 is 0 °~10 °.
The sealing nose length 12 is 10mm~18mm.
Furthermore, it is understood that described sleeve pipe nipple is to work as to be connected male and female button according to the torque value of setting with hydraulic tongs
It picks up and, until the step surface of pin thread contacts the step surface of female thread.The sealing cone of pin thread and female thread sealing surface cone-shaped at this time
At interference fit, female thread seals spherical surface and forms interference fit with the column sealed face of pin thread.Two sealing surfaces are mutually independent of each other, to
Reach expected gas sealing ability requirement.
The operation principle of this set pipe screw joint is that tight interference fit is formed after box and pin taper-face contact, shoulder cone
Face positions rapidly, guarantee twist-on positioning accuracy, and during twist-on, spherical surface and cylinder also generate interference fit, and shoulder is not only fixed
Position is accurate, while can reduce axial force, in pin thread, female thread engagement process, considerably increases the anti-compression properties of connector, close
Feng Xing, while also ensureing that conical seal (contact) face fits closely together.
The casing thread connection hermetic seal ability of multi-sealed face hook-type screw thread provided by the invention reaches inboard wall of tube body and bends
Take pressure.It is functional using hook-type screw thread tension+counter-bending+anti-internal pressure.Allow repeatedly upper, shackle and large torque to operate to be not easy
Thread gluing.
In conclusion casing thread connection provided by the invention on female thread by being arranged female thread spherical seal surface, female thread
Pin thread cylindrical sealing surface, pin thread conical surface seal face, pin thread torque is arranged in conical surface seal face, female thread torque shoulder face on pin thread
Circular bead surface, male and female button are connected by the way that screw thread is ratcheting, until the circular bead surface of pin thread contacts the circular bead surface of female thread, at this time pin thread
Sealing cone and the female thread sealing surface conical surface formed and be interference fitted, female thread sealing spherical surface is matched with the column sealed face formation interference of pin thread
It closes, multiple sealing surfaces are mutually independent of each other, and improve the sealing performance of casing, it is ensured that product of the present invention has relatively reliable sealing
Performance.
Example the above is only the implementation of the present invention is not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.Any modification made by all within the spirits and principles of the present invention,
Equivalent replacement, improvement etc., should be included within scope of the presently claimed invention.
Claims (10)
1. a kind of casing thread connection of multi-sealed hook-type screw thread, including female thread (A) and pin thread (B), which is characterized in that described
Internal thread (1), female thread spherical seal surface (3), female thread conical surface seal face (6), female thread have been set gradually from left to right on female thread (A)
Torque shoulder face (10), has been set gradually from left to right external screw thread (2) on the pin thread (B), pin thread cylindrical sealing surface (4), public
Conical surface seal face (7), pin thread torque shoulder face (11) are detained, the female thread (A) and the pin thread (B) pass through the internal thread (1)
Mesh together with the external screw thread (2), the female thread spherical seal surface (3) and the pin thread cylindrical sealing surface (4) closely connect
It touches, female thread conical surface seal face (6) and pin thread conical surface seal face (7) are in close contact, female thread torque shoulder face
(10) it is in close contact with pin thread torque shoulder face (11), pin thread (B) the sealed end inner surface is provided with cylindrical surface (13)
With circular conical surface (14), the cylindrical surface (13) close to pin thread torque shoulder face (11), the pin thread cylindrical sealing surface (4) and
Pin thread circular cone (15) transition is used between pin thread conical surface seal face (7).
2. the casing thread connection of multi-sealed hook-type screw thread as described in claim 1, which is characterized in that the internal thread
(1) loading end angle beta2It is 0 °~-10 °, guide surface angle beta1It is 5 °~15 °, the loading end angle beta of the external screw thread (2)3
It is 0 °~-10 °, guide surface angle beta4It is 5 °~15 °.
3. the casing thread connection of multi-sealed hook-type screw thread as described in claim 1, which is characterized in that the female thread is spherical
Sealing surface (3) and pin thread cylindrical sealing surface (4) interference fit, female thread conical surface seal face (6) and pin thread conical surface seal face (7)
It is also interference fit, interference volume is between 0.15~0.60mm.
4. the casing thread connection of multi-sealed hook-type screw thread as described in claim 1, which is characterized in that the female thread is spherical
Circular arc (5) rounding off is used between sealing surface (3) and female thread conical surface seal face (6).
5. the casing thread connection of multi-sealed hook-type screw thread as described in claim 1, which is characterized in that the circular arc (5)
Radius be 0.3mm~1.0mm.
6. the casing thread connection of multi-sealed hook-type screw thread as described in claim 1, which is characterized in that the female thread is spherical
The spherical radius of sealing surface (3) is 2.0mm~10mm.
7. the casing thread connection of multi-sealed hook-type screw thread as described in claim 1, which is characterized in that the female thread conical surface
The angle of sealing surface (6) is between 10 °~20 °, and the angle in pin thread conical surface seal face (7) is between 10 °~20 °.
8. the casing thread connection of multi-sealed hook-type screw thread as described in claim 1, which is characterized in that the female thread torque
Circular bead surface (10) end set has -10 °~-20 ° of reversed chamfering α1, pin thread torque shoulder face (11) end set has-
10 °~-20 ° of reversed chamfering α2。
9. the casing thread connection of multi-sealed hook-type screw thread as described in claim 1, which is characterized in that the pin thread circular cone
(15) taper is 0 °~10 °, and the taper of the circular conical surface (14) is 0 °~10 °.
10. the casing thread connection of multi-sealed hook-type screw thread as described in claim 1, which is characterized in that the sealing nose
Sub- length (12) is 10mm~18mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810683762.4A CN108716369A (en) | 2018-06-28 | 2018-06-28 | A kind of casing thread connection of multi-sealed hook-type screw thread |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810683762.4A CN108716369A (en) | 2018-06-28 | 2018-06-28 | A kind of casing thread connection of multi-sealed hook-type screw thread |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108716369A true CN108716369A (en) | 2018-10-30 |
Family
ID=63912415
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810683762.4A Pending CN108716369A (en) | 2018-06-28 | 2018-06-28 | A kind of casing thread connection of multi-sealed hook-type screw thread |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108716369A (en) |
-
2018
- 2018-06-28 CN CN201810683762.4A patent/CN108716369A/en active Pending
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