CN204852780U - Anticorrosive oil pipe's anticorrosive seal structure of pipe end - Google Patents
Anticorrosive oil pipe's anticorrosive seal structure of pipe end Download PDFInfo
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- CN204852780U CN204852780U CN201520388176.9U CN201520388176U CN204852780U CN 204852780 U CN204852780 U CN 204852780U CN 201520388176 U CN201520388176 U CN 201520388176U CN 204852780 U CN204852780 U CN 204852780U
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Abstract
The utility model provides an excircle surface non - anti -corrosion of metal coating that has coated uniformly that anticorrosive oil pipe's anticorrosive seal structure of pipe end is equipped with the anti -corrosion anti -corrosion of metal layer of pipe end on the pipe end face of pipeline section is connected to the steel, be equipped with the anti -corrosion anti -corrosion of metal layer of pipe wall on the excircle surface that the pipeline section is connected to the steel, the hole of the steel oil pipe body on the surface uniformly the coating have non - anti -corrosion of metal coating, the pipe wall anti -corrosion anti -corrosion of metal layer and steel oil pipe body combination department of pipeline section are connected at the steel. Two anticorrosive bodys are that the anti -corrosion anti -corrosion of metal layer of the pipe end butt joint through the two root canals body realizes that the butt joint is sealed in the coupling, because that the anti -corrosion anti -corrosion of metal layer of pipe end and pipe end steel body melt through laser cladding is as an organic whole, receives the rotation torque masterpiece and with only producing the friction wearing and tearing, can not destroy the anti -corrosion of metal layer when the rotatory butt joint of pipe end of two anticorrosive pipes, and the pipeline section is connected to the steel surface and pipe end all have the non -corrosibility ability, improve anticorrosive oil pipe's non -corrosibility ability, reduction in production cost.
Description
Technical field
The utility model relates to the anticorrosive oil pipe in a kind of oil field, can solve the tube corrosion problem of carbonated gas well.
Background technique
Oil pipe is oil, one of indispensable facility of natural gas extraction, traditional down-hole string also exists corrosion and protection problem, etching problem is the key factor being related to the normal production run of Oil/gas Well, particularly the corrosion and corrosion protection of offshore oilfield oil-extracting and water-injecting tubing string is just more outstanding, in oil field operation, often hydrogen sulfide is had in oil pipe column, sulfate reducing bacteria, chemical flooding hydrodynamic, three without combination flooding hydrodynamic, high temperature oxygen, carbon dioxide, the Korrosionsmediums such as chlorion exist, conventional oil pipe does not have anticorrosive function, oil pipe is under long-term work state, weld seam, inner tube wall, outer tube outer wall is being corroded property dielectric corrosion very easily, thus cause weld cracking, inner and outer pipes is corroded, oil pipe lost efficacy.In order to prevent pipe body corrosion, especially the Anticorrosion of body endoporus and connecting thread section, people have developed the antisepsis oil pipe applying organic corrosion-inhibiting coating in steel tube surface, anti-corrosion protection measure is implemented to oil pipe, this kind of antisepsis oil pipe can available protecting slow down the corrosion of tubing string, traditional anticorrosion tubing string generally adopts and applies organic corrosion-inhibiting coating at the section of the being threaded outer side surface at oil pipe endoporus and body two ends, the tubing string of the band corrosion-inhibiting coating of this structure in actual use, the antiseptic property of the bore area of anticorrosion tubing string is fine, effectively can keep out the erosion that in oily vapour, corrosivity is situated between, the corrosion of steel body can be prevented, improve the working life of body, but the connecting thread section end face corrosion at body two ends is rotted serious, light then seal face corrosion failure, severe one causes the whole section of being threaded to be rotted, defects such as rupturing is being there is in body with box cupling joint.Claimant is through conscientiously disassembling analysis, the main cause of above-mentioned defect is caused to be that two bodys are when docking with box cupling, in order to ensure the original seal performance of two body end faces, must by the docking end face screwing hermetic of two bodys, in screwing operations, the connecting end surface of two bodys will inevitably produce rotational shear effect, the corrosion-inhibiting coating of body end face is caused to tear breakage, can cause time serious corrosion-inhibiting coating and steel body refute from, make originally directly to be contacted with Korrosionsmedium by the steel body end face that corrosion-inhibiting coating covers, so just will inevitably produce spot corrosion at the bonding crack of tubing string connecting end surface or produce local etching by penetration mode, until there is corrosion failure in body connecting end, then aggressive medium can enter thread seal end face and carries out acidizing corrosion, so not only can lose efficacy to sealing interface originally, and can corrode connecting thread section, seal with screwed joint band is caused to lose efficacy, join strength significantly declines.
Once there is above-mentioned defect, the antiseptic property of anticorrosion body will significantly decline, until lost efficacy, the leakage of the gas in body, liquid will be produced after using a period of time, cause oil pipe column normally to work, directly affect petroleum production exploitation or station field collection is defeated and the operation of moisture transporting system, cause kill-job difficulty time serious or produce well logging and hinder, shorten the service life of oil pipe, add cost of production.
In order to effectively overcome this kind of defect, part oil pipe manufacturing enterprise is had to start to adopt 13Cr-110 oil pipe to substitute common antisepsis oil pipe, to eliminate the etching problem of oil pipe end face, although this scheme can solve the Anticorrosion of oil pipe, but 13Cr-110 oil pipe price is high, once drop into too high, and the section of being threaded and body seal face repeat to spin in using process in dismounting, connection sealing energy and reliability are difficult to ensure card, if give it up and lose too large.Working life is not long, and be only suitable for branded oil gas well, using scope is limited.How more economical, practicably to solve common steel anti-corrosion pipe screw thread end face Anticorrosion Problems is the technical barrier that those skilled in the art urgently wish to solve.
Model utility content:
The purpose of this utility model is to provide a kind of anticorrosive sealing configuration of pipe end of antisepsis oil pipe, it can effect a radical cure the anticorrosion of antisepsis oil pipe connecting thread end and a sealing difficult problem, improve the working life of antisepsis oil pipe, adopt the utility model that common steel tubing can be made to have excellent antiseptic property, and the anticorrosion and sealing problem that can realize in disassembly and assembly process repeatedly, overcome many deficiencies of the existence of existing technology.
A kind of anticorrosive sealing configuration of pipe end of antisepsis oil pipe, it is characterized in that: comprise steel oil pipe body, steel connects pipeline section, pipe end corrosion resistant metal anticorrosive coat, tube wall corrosion resistant metal anticorrosive coat and nonmetal corrosion-inhibiting coating, the end surfaces of steel connection pipeline section is provided with pipe end corrosion resistant metal anticorrosive coat, the bore area leading portion connecting pipeline section at steel is provided with tube wall corrosion resistant metal anticorrosive coat, and the bore area of steel oil pipe body is coated with nonmetal corrosion-inhibiting coating equably.
Further, the bore area of the tube wall corrosion resistant metal anticorrosive coat that the bore area leading portion connecting pipeline section at steel is provided with is coated with nonmetal corrosion-inhibiting coating equably.
Further, the final thickness size being arranged on the pipe end corrosion resistant metal anticorrosive coat that steel connects on pipeline section end face is more than or equal to 0.2 millimeter, and the final thickness size being arranged on the tube wall corrosion resistant metal anticorrosive coat that steel connects on pipeline section bore area leading portion is more than or equal to 0.1 millimeter.
Further, the final thickness being arranged on the pipe end corrosion resistant metal anticorrosive coat that steel connects on pipeline section end face is of a size of 1 ~ 5 millimeter, and the final thickness being arranged on the tube wall corrosion resistant metal anticorrosive coat that steel connects on pipeline section bore area leading portion is of a size of 0.5 ~ 1 millimeter.
Further, pipe end corrosion resistant metal anticorrosive coat and tube wall corrosion resistant metal anticorrosive coat are all obtained by laser cladding method, and its material is stainless steel or the corrosion resistant alloy such as cobalt base alloy or nickel-base alloy.
The processing method of this antiseptic oil body is as follows:
The first step, connects to the steel on steel oil pipe body the two ends of pipeline section to be connected pipeline section bore area with steel and carries out sizing turnery processing, stop pipe end corrosion resistant metal anticorrosive coat and tube wall corrosion resistant metal anticorrosive coat laser melting coating surplus;
Second step, laser cladding method is adopted to set up pipe end corrosion resistant metal anticorrosive coat to the body end face of steel connection pipeline section carries out laser melting coating, adopt the bore area leading portion of laser cladding method to steel connection pipeline section to carry out laser melting coating and set up tube wall corrosion resistant metal anticorrosive coat, guarantee the laser melting coating thickness of pipe end corrosion resistant metal anticorrosive coat and tube wall corrosion resistant metal anticorrosive coat, specific requirement is: the thickness size of machined rear pipe end corrosion resistant metal anticorrosive coat is more than or equal to 0.2 millimeter, the thickness size being arranged on the tube wall corrosion resistant metal anticorrosive coat of steel connection pipeline section bore area is more than or equal to 0.1 millimeter,
3rd step, to the finished body of second step anti-corrosion method routinely to the coating bore area of steel oil pipe body carrying out nonmetal corrosion-inhibiting coating, nonmetal corrosion-inhibiting coating covers the tube wall corrosion resistant metal anticorrosive coat that steel connects the bore area leading portion of pipeline section.
4th step, the periphery steel of the body of the 3rd step process being connected to pipeline section carries out the processing of connecting thread and carries out the accurate turning of fixed length to body.
Due to erosion-resisting end sealing linkage structure described in the utility model, the pipe end of pipeline section is connected and bore area leading portion has all set up pipe end corrosion resistant metal anticorrosive coat and tube wall corrosion resistant metal anticorrosive coat by laser cladding method at the steel of steel oil pipe body, and ensure that the final thickness size of the pipe end corrosion resistant metal anticorrosive coat being arranged on steel connection pipeline section end is more than or equal to 0.2 millimeter, the final thickness size being arranged on the tube wall corrosion resistant metal anticorrosive coat of steel connection pipeline section bore area leading portion is more than or equal to 0.1 millimeter, like this, when two anticorrosion bodys are by carrying out docking in rotary course with box cupling, the pipe end of two bodys relies on sealing fetching to achieve a butt joint of pipe end corrosion resistant metal anticorrosive coat, the steel body being connected pipeline section due to pipe end corrosion resistant metal anticorrosive coat with steel fuses into one, at the outer surface of pipe end corrosion resistant metal anticorrosive coat without the need to applying any corrosion-inhibiting coating, be subject to the effect of rotation torque power when two anticorrosion body pipe ends rotate docking and can produce friction wear, anti-corrosion of metal layer can not be destroyed, limit the thickness of anti-corrosion of metal layer, the wear allowance that anticorrosion body repeated disassembled and assembled spins can be ensured, ensure that anti-corrosion pipe has enough working life.The preferred stainless steel of material of pipe end corrosion resistant metal anticorrosive coat or the corrosion resistant alloy such as cobalt base alloy or nickel-base alloy, adding method is laser melting coating.Nonmetal corrosion-inhibiting coating is coated with equably in the endoporus of steel oil pipe body, the bore area connecting pipeline section at steel is provided with tube wall corrosion resistant metal anticorrosive coat, tube wall corrosion resistant metal anticorrosive coat is coated with nonmetal corrosion-inhibiting coating equably, nonmetal corrosion-inhibiting coating has overlapping with tube wall corrosion resistant metal anticorrosive coat, so just can ensure that the bore area of steel oil pipe body has antiseptic property, bore area and the end face of steel connection pipeline section all have antiseptic property, steel oil pipe body is without the need to using the 13Cr-110 material of high price, but antiseptic property meets or exceeds the antiseptic property of 13Cr-110 oil pipe, not only economy but also reliable, improve the antiseptic property of antisepsis oil pipe, reduce the cost of production of high standard anti-corrosion pipe, promote the antisepsis oil pipe technical merit of China.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is using state schematic diagram of the present utility model;
In figure: 1-steel oil pipe body; 2-steel connects pipeline section; 3-pipe end corrosion resistant metal anticorrosive coat; 4-tube wall corrosion resistant metal anticorrosive coat; The nonmetal corrosion-inhibiting coating of 5-; 6-box cupling.
Embodiment:
Specific embodiments of the present utility model is described in detail below in conjunction with accompanying drawing:
A kind of anticorrosive sealing configuration of pipe end of antisepsis oil pipe, comprise steel oil pipe body 1, steel connects pipeline section 2, pipe end corrosion resistant metal anticorrosive coat 3, tube wall corrosion resistant metal anticorrosive coat 4 and nonmetal corrosion-inhibiting coating 5, the end surfaces of steel connection pipeline section 2 sets up pipe end corrosion resistant metal anticorrosive coat 3 by laser cladding method, the bore area leading portion connecting pipeline section 2 at steel sets up tube wall corrosion resistant metal anticorrosive coat 4 by laser cladding method, wherein, the final thickness being arranged on the pipe end corrosion resistant metal anticorrosive coat 3 of steel connection pipeline section 2 end is of a size of 1.2 millimeters, the final thickness being arranged on the tube wall corrosion resistant metal anticorrosive coat 4 of steel connection pipeline section 2 bore area leading portion is of a size of 0.5 millimeter, the bore area of steel oil pipe body 1 is coated with nonmetal corrosion-inhibiting coating 5 equably, nonmetal corrosion-inhibiting coating 5 covers on the bore area of tube wall corrosion resistant metal anticorrosive coat 4, when two anticorrosion bodys are by carrying out docking in rotary course with box cupling 6, the pipe end of two bodys relies on sealing fetching to achieve a butt joint of pipe end corrosion resistant metal anticorrosive coat, the material of described pipe end corrosion resistant metal anticorrosive coat 3 and tube wall corrosion resistant metal anticorrosive coat 4 is stainless steel or the corrosion resistant alloy such as cobalt base alloy or nickel-base alloy.
The foregoing is only a preferred embodiment of the present utility model; not in order to limit the utility model; every above embodiment is done according to technical spirit of the present utility model any trickle amendment, equivalently replace and improve, within the protection domain that all should be included in technical solutions of the utility model.
Claims (4)
1. the anticorrosive sealing configuration of the pipe end of an antisepsis oil pipe, it is characterized in that: comprise steel oil pipe body (1), steel connects pipeline section (2), pipe end corrosion resistant metal anticorrosive coat (3), tube wall corrosion resistant metal anticorrosive coat (4) and nonmetal corrosion-inhibiting coating (5), the end surfaces of steel connection pipeline section (2) is provided with pipe end corrosion resistant metal anticorrosive coat (3), the bore area leading portion connecting pipeline section (2) at steel is provided with tube wall corrosion resistant metal anticorrosive coat (4), the bore area of steel oil pipe body (1) is coated with nonmetal corrosion-inhibiting coating (5) equably.
2. the anticorrosive sealing configuration of the pipe end of antisepsis oil pipe according to claim 1, is characterized in that: the bore area of the tube wall corrosion resistant metal anticorrosive coat (4) that the bore area leading portion connecting pipeline section (2) at steel is provided with is coated with nonmetal corrosion-inhibiting coating (5) equably.
3. the anticorrosive sealing configuration of the pipe end of antisepsis oil pipe according to claim 1, it is characterized in that: the final thickness size being arranged on the pipe end corrosion resistant metal anticorrosive coat (3) that steel connects on pipeline section (2) end face is more than or equal to 0.2 millimeter, the final thickness size being arranged on the tube wall corrosion resistant metal anticorrosive coat (4) that steel connects on pipeline section (2) bore area leading portion is more than or equal to 0.1 millimeter.
4. the anticorrosive sealing configuration of the pipe end of antisepsis oil pipe according to claim 3, it is characterized in that: the final thickness being arranged on the pipe end corrosion resistant metal anticorrosive coat (3) that steel connects on pipeline section (2) end face is of a size of 1 ~ 5 millimeter, the final thickness being arranged on the tube wall corrosion resistant metal anticorrosive coat (4) that steel connects on pipeline section (2) bore area leading portion is of a size of 0.5 ~ 1 millimeter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520388176.9U CN204852780U (en) | 2015-06-08 | 2015-06-08 | Anticorrosive oil pipe's anticorrosive seal structure of pipe end |
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| CN201520388176.9U CN204852780U (en) | 2015-06-08 | 2015-06-08 | Anticorrosive oil pipe's anticorrosive seal structure of pipe end |
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| CN204852780U true CN204852780U (en) | 2015-12-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104930300A (en) * | 2015-06-08 | 2015-09-23 | 江苏常宝钢管股份有限公司 | Pipe end anti-corrosive sealing structure of anti-corrosive oil pipe |
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2015
- 2015-06-08 CN CN201520388176.9U patent/CN204852780U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104930300A (en) * | 2015-06-08 | 2015-09-23 | 江苏常宝钢管股份有限公司 | Pipe end anti-corrosive sealing structure of anti-corrosive oil pipe |
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