CN107503694A - A kind of two-stage seals nipple - Google Patents
A kind of two-stage seals nipple Download PDFInfo
- Publication number
- CN107503694A CN107503694A CN201610414656.7A CN201610414656A CN107503694A CN 107503694 A CN107503694 A CN 107503694A CN 201610414656 A CN201610414656 A CN 201610414656A CN 107503694 A CN107503694 A CN 107503694A
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- Prior art keywords
- nipple
- angle
- shoulder
- torque shoulder
- joint
- 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
- 210000002445 nipple Anatomy 0.000 title claims abstract description 64
- 238000007789 sealing Methods 0.000 claims abstract description 90
- 239000003129 oil well Substances 0.000 claims abstract description 45
- 230000009977 dual effect Effects 0.000 claims abstract description 9
- 230000007704 transition Effects 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 239000011324 bead Substances 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000003068 static effect Effects 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
- E21B17/042—Threaded
-
- 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
- E21B17/08—Casing joints
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)
- Fuel-Injection Apparatus (AREA)
Abstract
The present invention seals nipple for a kind of two-stage, solves the problems, such as the sealing of oil-well pipe joint and annular space space, it is made up of a pin end and a female joint；Pin end is the joint that an oil well pipe one end has external thread structure, and the first outer torque shoulder, the first external seal face, external screw thread, the second external seal face, the second outer torque shoulder are followed successively by outward since inner；Female joint is the joint that another oil well pipe one end has female thread structure, and inboard end is followed successively by the first internal torque shoulder, the first inner sealing surface, internal thread, the second inner sealing surface, the second internal torque shoulder since outer end；The external screw thread of pin end and the internal thread of female joint are mutually screwed up and screwed, and form the nipple of dual stage shoulder two-stage sealing.This joint is applied to the nipple sleeve pipe of direct linkage type and pony collar connector product, can reduce the protrusion of the outer shoulder of joint, ensure annular space space；This joint is the nipple of dual stage shoulder two-stage sealing, has high sealing ability and anti-torque capability excessively.
Description
Technical field
The present invention relates to a kind of nipple, refers in particular to a kind of two-stage sealing nipple, is to be used for oil gas
Double containment dual stage shoulder thread connecting joint is used in exploitation.
Background technology
Oil well pipe is necessary oil country tubular good in oil, natural gas extraction, is connected through a screw thread to be formed
The oil well pipe of enough well depth depth, realizes the exploitation of petroleum resources.In recovery process, oil well pipe will be held
The load such as Tensile, compression, internal pressure, external pressure and bending, temperature, stress is harsh, to whole oil well pipe
Quality requirement it is higher, but in the prior art, the nipple of oil well pipe thread junction is wherein most weak
Link.
Existing oil well pipe screwed joints can substantially be divided into two classes, and one kind is standard API series of adapters, separately
Outer one kind is nonstandard series of adapters, commonly referred to as Special threading connector.Standard API series of adapters again can be with
It is divided into knuckle screw joint and the major class of buttress thread joint two, wherein, knuckle screw joint connects including long round thread
Head and short knuckle screw joint.The former the advantages of, is that processing cost is relatively low, and shortcoming is easily to produce slippage,
Tensile strength is not high, and antitorque insufficient with resistance to compression, is primarily adapted for use in the connection such as shallow well, low pressure well
The not high oil gas well operations of intensity requirement；The advantages of the latter is that bonding strength is high, can be applied to deep ＆ ultra-deep well
Operation, shortcoming is then to be antitorque poor with resistance to compression.Both are do not possess hermetic seal at common deficiency
Performance.
Special threading connector mostly employs special sealing structure form, reaches preferable hermetic seal effect, because
This is generally used for the hole condition environment that environment is harsh, requirement is higher.The oil-well pipe joint that oil gas field uses at present
Majority is the special thread jointing with box cupling form, because box cupling external diameter is more than outer tube diameter, box cupling,
There is shoulder in body junction so that the annular clearance very little at box cupling position.Therefore, when progress slim-hole
When drilling well, window sidetracking, old well reparation, horizontal well etc. are developed, drilling well annular clearance is smaller, it is necessary to makes
Ensure enough annular space spaces between outer layer sleeve with special nipple, to facilitate tripping in downhole tool.
For this kind of joint form, original sealing structure can not meet 100% body gas sealing ability requirement.
The content of the invention
The problem of the invention aims to overcome prior art to exist, there is provided a kind of two-stage sealing screw thread connects
Head, especially suitable for direct linkage type and the nipple sleeve pipe of pony collar connector product, reduce the outer shoulder of joint
It is prominent, ensure annular space space.
The purpose of the present invention is achieved through the following technical solutions：
A kind of two-stage seals nipple, and it is made up of a pin end and a female joint；Wherein：
The pin end is the joint that an oil well pipe one end has external thread structure, and it is outside since inner
End is followed successively by the first outer torque shoulder, and the first external seal face, external screw thread, the second external seal face, second turns round outside
Square shoulder；
The female joint is the joint that another oil well pipe one end has female thread structure, its since outer end to
The inner is followed successively by the first internal torque shoulder, the first inner sealing surface, internal thread, the second inner sealing surface, in second
Torque shoulder；
The external screw thread of the pin end and the internal thread of the female joint are mutually screwed up and screwed, and form nipple；
The first external seal face on nipple forms nipple primary sealing area with the first inner sealing surface；Screw thread connects
The second external seal face on head forms nipple secondary sealing area with the second inner sealing surface；On nipple
First outer torque shoulder forms the torque shoulder of nipple first with the first internal torque shoulder；On nipple
Second outer torque shoulder forms the torque shoulder of nipple second with the second internal torque shoulder, makes nipple shape
The nipple of shoulder two-stage sealing in pairs.
In the male and female joint：
There is an angle between first outer torque shoulder and oil well pipe central shaft, be the first outer torque shoulder angle
θ12；
There is an angle between first internal torque shoulder and oil well pipe central shaft, be the first internal torque shoulder angle
θ22；
There is an angle between second outer torque shoulder and oil well pipe central shaft, be the second outer torque shoulder angle
θ14；
There is an angle between second internal torque shoulder and oil well pipe central shaft, be the second internal torque shoulder angle
θ24；
There is an angle between first external seal face and oil well pipe central shaft, be the first external seal face angle, θ11；
There is an angle between first inner sealing surface and oil well pipe central shaft, be the first inner sealing surface angle, θ21；
There is an angle between second external seal face and oil well pipe central shaft, be the second external seal face angle, θ13；
There is an angle between second inner sealing surface and oil well pipe central shaft, be the second inner sealing surface angle, θ23。
The θ12, θ22, θ14, θ24, θ11, θ21, θ13And θ13Between following relation be present：
θ12=θ22, θ14=θ24, θ11=θ21And θ13=θ13, and θ13＞ θ11And θ23＞ θ21。
The θ12And θ22It is right angle shoulder or is negative angle shoulder, angular range is 75 ° -90 °.
The θ14And θ24It is right angle shoulder or negative angle shoulder, angular range is 65 ° -90 °；
The θ11, θ21, θ13And θ23Angular range between 5 ° -30 °.
Following relation be present in the pin end and the length of female joint：
LIt is public=LIt is female+δ
In formula, LIt is publicFor pin end length；LIt is femaleFor female joint length；δ is to control its value of tolerance to be
0mm-0.2mm。
The face of cylinder that changeover portion between first, second sealing surface and external screw thread of the pin end is formed, with
Exist between the face of cylinder that changeover portion between the sealing surface of female joint first, second and internal thread is formed
0.4-0.6mm gap so that each between two pairs of transitions to form one after nipple connection
Cavity.
Beneficial effects of the present invention：
The present invention can realize connection and sealing between oil well pipe, be produced especially suitable for direct linkage type and pony collar joint
The nipple sleeve pipe of product, using this joint, the protrusion of the outer shoulder of joint can be reduced, ensure annular space space.
Meanwhile this joint is equipped with sealing surface and circular bead surface structure in screw thread both sides, have under higher bonding strength
High sealing ability and anti-the advantages of crossing torque capability.
To further illustrate above-mentioned purpose, design feature and the effect of the present invention, below with reference to accompanying drawing to this
Invention is described in detail.
Brief description of the drawings
Fig. 1 is that (direct linkage type double-sealing face dual stage shoulder) two-stage of the present invention seals nipple connection figure；
Fig. 2 is the pin end outline drawing in (direct linkage type double-sealing face dual stage shoulder) Fig. 1 nipples；
Fig. 3 is the female joint outline drawing in (direct linkage type double-sealing face dual stage shoulder) Fig. 1 nipples；
Fig. 4 is a kind of shape appearance figure schematic diagram of negative angle joint screw thread；
Fig. 5 is the schematic diagram in the first outer torque shoulder of pin end of the present invention and the first external seal face；
Fig. 6 is the schematic diagram of female joint the first internal torque shoulder of the present invention and the first inner sealing surface；
Fig. 7 is the schematic diagram of pin end the second external seal face of the present invention and the second outer torque shoulder；
Fig. 8 is the schematic diagram of the inner sealing surface of female joint second of the present invention and the second internal torque shoulder；
Fig. 9 is the schematic diagram that two-stage of the present invention sealing coordinates.
Embodiment
The embodiment of the present invention is described in detail with reference to the accompanying drawing of embodiment.
Referring to Fig. 1-Fig. 3, two-stage of the invention sealing nipple includes a pin end 1 and a mother connects
First 2.
For the structure of the pin end 1 referring to Fig. 2, pin end 1 is that an oil well pipe one end has external screw thread knot
The joint of structure, (right-hand member in Fig. 2) is followed successively by the outward since inner (left end in Fig. 2) for it
One outer torque shoulder 13, the first external seal face 14, external screw thread 15, the second external seal face 16, second turns round outside
Square shoulder 17；
For the structure of the female joint 2 referring to Fig. 3, female joint 2 is that another oil well pipe one end has internal thread
The joint of structure, its inboard end (right-hand member in Fig. 3) since outer end (left end in Fig. 3) are followed successively by
First internal torque shoulder 23, the first inner sealing surface 24, internal thread 25, the second inner sealing surface 26, in second
Torque shoulder 27；
The external screw thread 15 of the pin end 1 and the internal thread 25 of the female joint 2 are mutually screwed up and screwed, shape
Into nipple；The first external seal face 14 and the first inner sealing surface 24 on nipple form nipple
Primary sealing area；The second external seal face 16 and the second inner sealing surface 26 on nipple form nipple
Secondary sealing area；The first outer internal torque shoulder 23 of torque shoulder 13 and first on nipple forms screw thread
The torque shoulder of joint first；The second outer shape of 17 and second internal torque shoulder of torque shoulder 27 on nipple
Into the torque shoulder of nipple second, nipple is set to form the nipple of dual stage shoulder two-stage sealing.
Referring to Fig. 5-Fig. 8, wherein：
θ12For the first outer torque shoulder angle, it is between the first outer torque shoulder 13 and oil well pipe central shaft
Angle；
θ22For the first internal torque shoulder angle, it is between the first internal torque shoulder 23 and oil well pipe central shaft
Angle；
θ14For the second outer torque shoulder angle, it is between the second outer torque shoulder 17 and oil well pipe central shaft
Angle；
θ24For the second internal torque shoulder angle, it is between the second internal torque shoulder 27 and oil well pipe central shaft
Angle；
θ11For the first external seal face angle degree, it is the folder between the first external seal face 14 and oil well pipe central shaft
Angle；
θ21For the first inner sealing surface angle, it is the folder between the first inner sealing surface 24 and oil well pipe central shaft
Angle；
θ13For the second external seal face angle degree, it is the folder between the second external seal face 16 and oil well pipe central shaft
Angle；
θ23For the second inner sealing surface angle, it is the folder between the second inner sealing surface 26 and oil well pipe central shaft
Angle.
As shown in Figure 5-Figure 8：
First outer torque shoulder angle, θ of the first outer torque shoulder 1312With the first of the first internal torque shoulder 23
Internal torque shoulder angle, θ22Can also be that (negative angle shoulder is as shown in Figure 4 to negative angle shoulder for right angle shoulder
Screw thread pattern be not rectangular-shaped, but skewed), θ12And θ22Angular range be 75 ° -90 °；
Second outer torque shoulder angle, θ of the second outer torque shoulder 1714With the of the second internal torque shoulder 27
Two internal torque shoulder angle, θs24For right angle shoulder or negative angle shoulder, θ14And θ24Angular range be
65°-90°；
The first external seal face angle, θ in the first external seal face 1411With the first interior sealing of the first inner sealing surface 24
Face angle, θ21, the second external seal face angle, θ in the second external seal face 1613With the of the second inner sealing surface 26
Two inner sealing surface angle, θs23Angular range between 5 ° -30 °.
To ensure to seal fiting effect, sealing surface, shoulder structural point corresponding to pin end 1 and female joint 2
It is identical, i.e.,：θ11=θ21, θ12=θ22, θ13=θ23, θ14=θ24.Further, secondary sealing area angle
More than primary sealing area angle, i.e. θ13＞ θ11And θ23＞ θ21.Primary sealing area angle is more gentle,
Meet the sealing property under the deformation conditions such as stretching, bending；Secondary sealing area angle is larger, so as to mainly hold
Carry the additional axially contact power of torque wrench moment.
According to body various outer diameter and wall thickness dimension, primary sealing area secondary sealing area chooses different mistakes respectively
The amount of being full of, meet seal request；External screw thread 15 and internal thread 25 can use conventional API screw threads, can also
Using the buttress thread form (shape as shown in Figure 4) of optimization.
Further, the primary sealing area and secondary sealing area that pin and box sub is formed can pass through allowance control
Realize that sealing coordinates, so as to meet seal request under different working conditions.In the operating mode based on static load and internal pressure
Under the conditions of, seal pressure is high, using secondary sealing area as main seal.In drawing high with external pressure and bending condition
Under, joint sealing and protection are mainly realized by primary sealing area.It is full between two-stage sealing surface referring to Fig. 9
Sufficient tolerance：
LIt is public=LIt is female+δ
In formula, LIt is publicFor pin end length；LIt is femaleFor female joint length；δ is control tolerance, by connector outer diameter and
Wall thickness determines that general δ is 0mm-0.2mm.
Referring to Fig. 1-3, the present invention be it is a kind of with screw thread direct linkage type and with two-stage sealing, dual stage shoulder oil well
Pipe joint, nipple of the invention are directly processed in body end, and its operation principle is as follows：One
The female joint 2 of the pin end 1 and another oil well pipe of oil well pipe, which mutually screws up, to be screwed, after tightening, outside first
The internal torque shoulder 23 of torque shoulder 13 and first is in contact, the first outer internal torque platform of torque shoulder 17 and second
Shoulder 27 is in contact, and both of which can undertake torque wrench moment, and can play a part of auxiliary seal；It is close in first
The external seal face 24 of front cover 14 and first forms adopting conical surface interference and coordinated, and can prevent external fluid from leaking into body
Portion；Second inner sealing surface 16 and the second external seal face 26 also form adopting conical surface interference cooperation, can prevent inside stream
Body (including oil and natural gas) is leaked into outside body.Meanwhile external screw thread 15 and internal thread 25 are in footpath
To thread interference cooperation being present, there is provided the enough bonding strengths of nipple, play linkage function.
Because nipple is directly processed in body end, therefore the external diameter of joint, internal diameter and body
External diameter, internal diameter are concordant.From the appearance come, the joint dimension after upper complete button be equal to or it is micro- be more than body, from
And it ensure that the maximal clearance between body and outer layer sleeve.Positioned at first, second sealing surface of pin end and outer
The face of cylinder that changeover portion between screw thread is formed, between the sealing surface of female joint first, second and internal thread
0.4-0.6mm gap between the face of cylinder that changeover portion is formed be present so that after nipple connection,
A cavity is respectively formed between two pairs of transitions, unnecessary thread compound can be stored, and optimize at sealing surface
Contact distribution, the gas sealing ability being favorably improved at sealing surface.
Embodiments of the invention 1：
From specification：The external diameter of oil well pipe is φ 88.9mm, wall thickness 9.52mm, nipple (male and female
The external diameter of joint is as wall thickness data) parameter is as follows：
Internal diameter is 69.86mm, pitch 4.233mm, thread taper 1:16, first is outer, inner sealing surface angle
For 9 ° of (θ11, θ21), first is outer, internal torque shoulder angle faces angle is 90 ° of (θ12, θ22), second outer,
Inner sealing surface angle is 30 ° of (θ13, θ23), second is outer, internal torque circular bead surface angle is 75 ° of (θ14, θ24)。
Implementation result：Bond pull efficiency reaches body 58%；Compression efficiency is equivalent to body 30%；Gas medium
Under the conditions of, joint sealing internal pressure value is more than 100%API body internal yield pressure strengths；For P110 grade of steels
Joint, torque wrench moment value reach 5000N.m.
Embodiments of the invention 2：
From specification：External diameter is φ 177.8mm, and wall thickness 10.36mm, nipple be (male and female joint
External diameter is as wall thickness data) parameter is as follows：
Joint Parameter is as follows：Internal diameter is 157.08mm, pitch 5.08mm, thread taper 1:16, first outer,
Inner sealing surface angle is 9 ° of (θ11, θ21), first is outer, internal torque circular bead surface angle is 90 ° of (θ12, θ22),
Second is outer, inner sealing surface angle is 21 ° of (θ13, θ23), second is outer, 75 ° of (θ of internal torque circular bead surface14, θ24)。
Implementation result：Bond pull efficiency reaches body 53%；Compression efficiency is equivalent to body 30%；Gas medium
Under the conditions of, joint sealing internal pressure value is more than 100%API body internal yield pressure strengths；For P110 grade of steels
Joint, torque wrench moment value reach 13000N.m.
Those of ordinary skill in the art is it should be appreciated that the embodiment of the above is intended merely to explanation originally
The purpose of invention, and be not used as limitation of the invention, if in the essential scope of the present invention, to
Change, the modification of the upper embodiment will all fall in the range of the claim of the present invention.
Claims (8)
1. a kind of two-stage seals nipple, it is characterised in that is made up of a pin end and a female joint；Wherein：
The pin end is the joint that an oil well pipe one end has external thread structure, and it is followed successively by the first outer torque shoulder, the first external seal face, external screw thread, the second external seal face, the second outer torque shoulder outward since inner；
The female joint is the joint that another oil well pipe one end has female thread structure, and its inboard end since outer end is followed successively by the first internal torque shoulder, the first inner sealing surface, internal thread, the second inner sealing surface, the second internal torque shoulder；
The external screw thread of the pin end and the internal thread of the female joint are mutually screwed up and screwed, and form nipple；The first external seal face on nipple forms nipple primary sealing area with the first inner sealing surface；The second external seal face on nipple forms nipple secondary sealing area with the second inner sealing surface；The first outer torque shoulder on nipple forms the torque shoulder of nipple first with the first internal torque shoulder；The second outer torque shoulder on nipple forms the torque shoulder of nipple second with the second internal torque shoulder, nipple is formed the nipple of dual stage shoulder two-stage sealing.
2. two-stage as claimed in claim 1 seals nipple, it is characterised in that：
In the male and female joint：
There is an angle between first outer torque shoulder and oil well pipe central shaft, be the first outer torque shoulder angle, θ12；
There is an angle between first internal torque shoulder and oil well pipe central shaft, be the first internal torque shoulder angle, θ22；
There is an angle between second outer torque shoulder and oil well pipe central shaft, be the second outer torque shoulder angle, θ14；
There is an angle between second internal torque shoulder and oil well pipe central shaft, be the second internal torque shoulder angle, θ24；
There is an angle between first external seal face and oil well pipe central shaft, be the first external seal face angle, θ11；
There is an angle between first inner sealing surface and oil well pipe central shaft, be the first inner sealing surface angle, θ21；
There is an angle between second external seal face and oil well pipe central shaft, be the second external seal face angle, θ13；
There is an angle between second inner sealing surface and oil well pipe central shaft, be the second inner sealing surface angle, θ23。
3. two-stage as claimed in claim 2 seals nipple, it is characterised in that：
The θ12, θ22, θ14, θ24, θ11, θ21, θ13And θ13Between following relation be present：
θ12=θ22, θ14=θ24, θ11=θ21And θ13=θ13, and θ13＞ θ11And θ23＞ θ21。
4. two-stage as claimed in claim 2 or claim 3 seals nipple, it is characterised in that：
The θ12And θ22It is right angle shoulder or is negative angle shoulder, angular range is 75 ° -90 °.
5. two-stage as claimed in claim 2 or claim 3 seals nipple, it is characterised in that：
The θ14And θ24It is right angle shoulder or negative angle shoulder, angular range is 65 ° -90 °.
6. two-stage as claimed in claim 2 or claim 3 seals nipple, it is characterised in that：
The θ11, θ21, θ13And θ23Angular range between 5 ° -30 °.
7. two-stage as claimed in claim 1 seals nipple, it is characterised in that：
Following relation be present in the pin end and the length of female joint：
LIt is public=LIt is female+δ
In formula, LIt is publicFor pin end length；LIt is femaleFor female joint length；δ is that to control its value of tolerance be 0mm-0.2mm.
8. two-stage as claimed in claim 1 seals nipple, it is characterised in that：
The face of cylinder that changeover portion between first, second sealing surface and external screw thread of the pin end is formed, 0.4-0.6mm gap between the face of cylinder that changeover portion between the sealing surface of female joint first, second and internal thread is formed be present, so that after nipple connection, a cavity is respectively formed between two pairs of transitions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610414656.7A CN107503694A (en) | 2016-06-14 | 2016-06-14 | A kind of two-stage seals nipple |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610414656.7A CN107503694A (en) | 2016-06-14 | 2016-06-14 | A kind of two-stage seals nipple |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107503694A true CN107503694A (en) | 2017-12-22 |
Family
ID=60678511
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610414656.7A Pending CN107503694A (en) | 2016-06-14 | 2016-06-14 | A kind of two-stage seals nipple |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107503694A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112576205A (en) * | 2019-09-29 | 2021-03-30 | 宝山钢铁股份有限公司 | Special screwed joint of high-temperature well casing pipe |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2131821A1 (en) * | 1992-03-09 | 1993-09-16 | Erich F. Klementich | Stabilized center-shoulder-sealed tubular connection |
| CN2725501Y (en) * | 2004-08-30 | 2005-09-14 | 宝山钢铁股份有限公司 | Bishoulder drill rod adaptor |
| CN101824969A (en) * | 2010-04-09 | 2010-09-08 | 衡阳华菱连轧管有限公司 | Double-shoulder double-sealing face screwed nipple and collar-free oil well pipe using same |
| CN203008801U (en) * | 2012-09-26 | 2013-06-19 | 宝山钢铁股份有限公司 | Whole type oil pipe joint with air-tight seal structure |
-
2016
- 2016-06-14 CN CN201610414656.7A patent/CN107503694A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2131821A1 (en) * | 1992-03-09 | 1993-09-16 | Erich F. Klementich | Stabilized center-shoulder-sealed tubular connection |
| CN2725501Y (en) * | 2004-08-30 | 2005-09-14 | 宝山钢铁股份有限公司 | Bishoulder drill rod adaptor |
| CN101824969A (en) * | 2010-04-09 | 2010-09-08 | 衡阳华菱连轧管有限公司 | Double-shoulder double-sealing face screwed nipple and collar-free oil well pipe using same |
| CN203008801U (en) * | 2012-09-26 | 2013-06-19 | 宝山钢铁股份有限公司 | Whole type oil pipe joint with air-tight seal structure |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112576205A (en) * | 2019-09-29 | 2021-03-30 | 宝山钢铁股份有限公司 | Special screwed joint of high-temperature well casing pipe |
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Application publication date: 20171222 |