CN214579434U - Pipe end connecting structure of bimetal metallurgy composite pipe - Google Patents
Pipe end connecting structure of bimetal metallurgy composite pipe Download PDFInfo
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- CN214579434U CN214579434U CN202022901881.8U CN202022901881U CN214579434U CN 214579434 U CN214579434 U CN 214579434U CN 202022901881 U CN202022901881 U CN 202022901881U CN 214579434 U CN214579434 U CN 214579434U
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Abstract
The utility model discloses a bimetal metallurgy composite pipe end connection structure, which comprises a coupling and oil pipes in threaded connection with the two ends of the coupling, wherein tapered threads are arranged on the two sides of the inner cavity of the coupling, the tapered threads of the coupling are arranged by the outer end to the inner end in a shrinkage and inclination way, and a coupling overlaying layer is arranged in the middle of the inner cavity of the coupling; the coupling bead welding layer comprises a first welding layer and a second welding layer, wherein the first welding layer is bead welded on the inner wall of the middle part of the inner cavity of the coupling, the second welding layer is bead welded on the middle part of the first welding layer, the cross section of the second welding layer is isosceles trapezoid, an annular groove is formed between the first welding layer and the inner end of the conical thread of the coupling, and an air guide hole leading to the annular groove is formed in the outer wall of the coupling; the base pipe of the coupling threaded connection and the inner liner of the inner layer form the oil pipe, and the pipe end of the oil pipe is welded with a pipe end surfacing layer in sliding fit with the included angle between the first welding layer and the second welding layer. The utility model aims at providing a can avoid potential difference and galvanic corrosion, and connect the metallurgical compound pipe end connection structure of bimetal that leakproofness is high.
Description
Technical Field
The utility model relates to an oil gas transport technical field especially relates to a bimetal metallurgy composite pipe end connection structure.
Background
Along with the development of economy, the demand of various industries on energy is increased rapidly, the mining strength of petroleum and natural gas as clean energy at home and abroad is improved rapidly, and CO in a medium in the oil and gas mining process2、H2S and other components have high corrosivity on metal materials, and the oil pipe has the characteristic that the oil pipe is difficult to replace and maintain after installation and construction are finished, so that once serious corrosion occurs, huge economic loss and even major safety accidents are easily caused, and the metal materials with high corrosion resistance level are required to be adopted to reduce the corrosion of the pipe wall and prolong the service life. The traditional oil pipe such as a pure corrosion-resistant alloy pipeline of 13Cr, 22Cr and the like has strong corrosion resistance, but is extremely expensive. In order to reduce the exploitation cost of petroleum and natural gas, the bimetal metallurgy composite pipe is gradually put into use in the field of oil and gas exploitation in recent years. Common bimetallic metallurgical composite pipes are composed of two structural layers, mainly a thin lining layer made of corrosion resistant alloy for resisting corrosion of the medium to the pipeline, and a thicker base pipe made of carbon steel for providing structural strength.
The pipe end of the common bimetal metallurgical composite pipe is usually connected by welding or coupling threads, the welding has high requirement on the skill of operators, the operation time is long, the welding seam inspection steps are complicated, and because the inner wall and the outer wall of the bimetal metallurgical composite pipe are made of different materials, the multi-pass welding of dissimilar metals is involved, the construction quality is difficult to guarantee under the complex operation environment on site, and the application in actual engineering projects is less. The coupling thread connection is characterized in that because two metals at the pipe end of the bimetal metallurgy composite pipe have potential difference, galvanic corrosion is easily caused under the condition of exposure to a medium, if the pipe end flanging mode is adopted, the lining pipe is turned up to cover the carbon steel at the pipe end of the base pipe, the connection tightness is affected, and the coupling thread connection cannot be applied to a high-pressure environment; meanwhile, in order to prevent liquid from permeating into the gaps of the pipe end to corrode the coupling, the coupling is usually made of corrosion-resistant alloy, and the cost is high.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome not enough among the above-mentioned prior art, aim at providing one kind and can avoid bimetal metallurgical compound pipe end to have potential difference and galvanic corrosion, and connect the leakproofness height, the lower bimetal metallurgical compound pipe end connection structure of cost.
In order to achieve the above purpose, the technical scheme of the utility model is realized like this:
a pipe end connecting structure of a bimetal metallurgy composite pipe comprises a coupling and oil pipes in threaded connection with two ends of the coupling, wherein tapered threads are arranged on two sides of an inner cavity of the coupling, the tapered threads of the coupling are arranged in a manner that the outer end of each tapered thread is contracted towards the inner end of each tapered thread, and a coupling surfacing layer is arranged in the middle of the inner cavity of the coupling; the coupling bead welding layer comprises a first welding layer and a second welding layer, wherein the first welding layer is bead welded on the inner wall of the middle part of the inner cavity of the coupling, the second welding layer is bead welded on the middle part of the first welding layer, the cross section of the second welding layer is isosceles trapezoid, an annular groove is formed between the first welding layer and the inner end of the conical thread of the coupling, and an air guide hole leading to the annular groove is formed in the outer wall of the coupling; the oil pipe comprises a base pipe connected with the coupling in a threaded manner and an inner liner layer of the inner layer, and the pipe end of the oil pipe is welded with a pipe end surfacing layer in sliding fit with an included angle between the first welding layer and the second welding layer.
Further, the lower base angle of the isosceles trapezoid cross section of the second welding layer is 30-70 degrees.
Further, the coupling and the base pipe are made of carbon steel, and the lining layer, the pipe end surfacing layer and the coupling surfacing layer are made of one of 316L stainless steel, 2205 stainless steel or nickel-based alloy.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model discloses a contained angle between the two-layer weld layer of coupling resurfacing welding layer makes and keeps apart three sealed face between medium and the coupling in the oil pipe, can strengthen sealed effect, avoids the coupling to expose and causes the corruption in the medium. Oil pipe passes through contained angle sliding fit between pipe end surfacing layer and first layer and the second layer, can prevent that the excessive seal structure that causes of installing of toper screw thread between oil pipe and the coupling from becoming invalid. The annular groove between the first welding layer and the inner end of the conical thread can detect the sealing position of the surfacing layer in the coupling through the air guide hole, and the sealing performance between the coupling and the oil pipe is effectively guaranteed to be detected. The coupling surfacing layer and the pipe end surfacing layer are both positioned between the conical threads of the inner cavity of the coupling, so that the coupling surfacing layer and the pipe end surfacing layer are not influenced by external load. The lining layer, the pipe end surfacing layer and the coupling surfacing layer are all made of one of 316L stainless steel, 2205 stainless steel or nickel-based alloy, so that the potential difference between metal material differences can be avoided, and galvanic corrosion caused by exposure to a medium can be further avoided.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of the coupling of the present invention;
fig. 3 is a schematic structural diagram of the middle oil pipe of the present invention.
Description of reference numerals:
1-lining layer, 2-base pipe, 3-pipe end surfacing layer, 4-air guide hole, 5-annular groove, 6-coupling, 7-coupling surfacing layer, 71-first welding layer and 72-second welding layer.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
As shown in fig. 1 to 3, a bimetal metallurgy composite pipe end connection structure comprises a coupling 6 and oil pipes in threaded connection with two ends of the coupling 6, wherein tapered threads are arranged on two sides of an inner cavity of the coupling 6, the tapered threads of the coupling 6 are both arranged in a manner that the outer ends are contracted and inclined towards the inner ends, and a coupling surfacing layer 7 is arranged in the middle of the inner cavity of the coupling 6; the coupling bead welding layer 7 comprises a first welding layer 71 welded on the inner wall of the middle part of the inner cavity of the coupling 6 in a bead welding mode, and a second welding layer 72 welded on the middle part of the first welding layer 71 in a bead welding mode and having an isosceles trapezoid cross section, an annular groove 5 is formed between the first welding layer 71 and the inner end of the conical thread of the coupling 6, and an air guide hole 4 leading to the annular groove 5 is formed in the outer wall of the coupling 6; the oil pipe comprises a base pipe 2 in threaded connection with a coupling 6 and an inner lining layer 1 on the inner layer, and a pipe end surfacing layer 3 in sliding fit with an included angle between a first welding layer 71 and a second welding layer 72 is welded on the pipe end of the oil pipe.
Wherein, the lower base angle of the isosceles trapezoid cross section of the second welding layer 72 is 30-70 degrees. The second welding layer 72 with the isosceles trapezoid cross section can enable the contact surface between the tube end surfacing layer 3 and the collar surfacing layer 7 to form a Z-shaped sealing surface. The lower bottom edge of the section of the second welding layer 72 and the tube end surfacing layer 3 form a first sealing surface directly contacted with a medium in an oil pipe, the oblique edge of the section of the second welding layer 72 and the tube end surfacing layer 3 form a second sealing surface, and the upper bottom edge of the section of the second welding layer 72 and the tube end surfacing layer 3 form a third sealing surface. Therefore, three sealing surfaces are isolated between the medium in the oil pipe and the coupling 6, the sealing effect can be enhanced, and the coupling 6 is prevented from being corroded when exposed to the medium.
Oil pipe passes through contained angle sliding fit between pipe end surfacing layer 3 and first layer 71 and the second layer 72, can prevent the toper screw thread wearing and tearing that the excessive installation of the toper screw thread between oil pipe and the coupling 6 arouses, prevents that the sealed effect of toper screw thread from becoming invalid. The annular groove 5 between the first welding layer 71 and the inner end of the conical thread can detect the sealing position of the surfacing layer in the coupling 6 through the air guide hole 4, and the sealing detection between the coupling 6 and an oil pipe is effectively ensured. Coupling weld overlay 7 and tube end weld overlay 3 are both located between the tapered threads of the inner cavity of coupling 6, which can protect coupling weld overlay 7 and tube end weld overlay 3 from external loads.
The coupling 6 and the base pipe 2 are made of carbon steel, and the lining layer 1, the pipe end surfacing layer 3 and the coupling surfacing layer 7 are made of one of 316L stainless steel, 2205 stainless steel or nickel-based alloy. The lining layer 1, the pipe end surfacing layers 3 and the coupling surfacing layers 7 are made of the same metal, so that the potential difference existing among metal material differences can be avoided, and further galvanic corrosion caused under the condition of exposure to a medium is avoided.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. The utility model provides a bimetal metallurgy composite pipe end connection structure, includes the coupling to and the oil pipe of threaded connection at coupling both ends, the both sides of coupling inner chamber all are provided with toper screw thread, its characterized in that: the conical threads of the coupling are all arranged in a manner that the outer end is contracted and inclined towards the inner end, and a coupling surfacing layer is arranged in the middle of the inner cavity of the coupling; the coupling bead welding layer comprises a first welding layer and a second welding layer, wherein the first welding layer is bead welded on the inner wall of the middle part of the inner cavity of the coupling, the second welding layer is bead welded on the middle part of the first welding layer, the cross section of the second welding layer is isosceles trapezoid, an annular groove is formed between the first welding layer and the inner end of the conical thread of the coupling, and an air guide hole leading to the annular groove is formed in the outer wall of the coupling; the oil pipe comprises a base pipe connected with the coupling in a threaded manner and an inner liner layer of the inner layer, and the pipe end of the oil pipe is welded with a pipe end surfacing layer in sliding fit with an included angle between the first welding layer and the second welding layer.
2. The pipe end connecting structure of the bimetal metallurgical composite pipe according to claim 1, wherein: the lower base angle of the isosceles trapezoid cross section of the second welding layer is 30-70 degrees.
3. The pipe end connecting structure of the bimetal metallurgical composite pipe according to claim 1, wherein: the inner liner, the pipe end surfacing layer and the coupling surfacing layer are all made of one of 316L stainless steel, 2205 stainless steel or nickel-based alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022901881.8U CN214579434U (en) | 2020-12-04 | 2020-12-04 | Pipe end connecting structure of bimetal metallurgy composite pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022901881.8U CN214579434U (en) | 2020-12-04 | 2020-12-04 | Pipe end connecting structure of bimetal metallurgy composite pipe |
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| Publication Number | Publication Date |
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| CN214579434U true CN214579434U (en) | 2021-11-02 |
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| CN202022901881.8U Active CN214579434U (en) | 2020-12-04 | 2020-12-04 | Pipe end connecting structure of bimetal metallurgy composite pipe |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117108834A (en) * | 2023-10-24 | 2023-11-24 | 延安嘉盛石油机械有限责任公司 | Corrosion-resistant assembly and preparation method thereof |
-
2020
- 2020-12-04 CN CN202022901881.8U patent/CN214579434U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117108834A (en) * | 2023-10-24 | 2023-11-24 | 延安嘉盛石油机械有限责任公司 | Corrosion-resistant assembly and preparation method thereof |
| CN117108834B (en) * | 2023-10-24 | 2024-01-02 | 延安嘉盛石油机械有限责任公司 | Corrosion-resistant assembly and preparation method thereof |
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