CN1325747C - Surface treatment method of internal thread of stainless steel oil pipe collar - Google Patents
Surface treatment method of internal thread of stainless steel oil pipe collar Download PDFInfo
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- CN1325747C CN1325747C CNB2005100887726A CN200510088772A CN1325747C CN 1325747 C CN1325747 C CN 1325747C CN B2005100887726 A CNB2005100887726 A CN B2005100887726A CN 200510088772 A CN200510088772 A CN 200510088772A CN 1325747 C CN1325747 C CN 1325747C
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Abstract
The present invention relates to a surface treating method for improving the thread gluing resisting capacity of L80 (13Cr) tubing coupling screw threads. Firstly, iron nitrogen compounds or iron nitrogen compounds containing iron are formed on the surface of the tubing coupling screw threads by utilizing an azotizing method, and a technological process comprises: removing oil stains on the surface of a tubing coupling-washing in water-stoving or blowing-outside surface protecting-gas nitriding-furnace cooling. Afterwards, a homogeneous phosphate coating layer is formed on the surface of the tubing coupling screw threads by utilizing a parkerizing method, and a technological process comprises: clearing oil stains on the surface-washing in water-weak corrosion-washing in water-surface activating-phosphate treatment-washing in water-stoving or blowing-oil immersion. The surface of obtained screw threads has strong thread gluing resisting capacity, and the thread gluing resisting capacity of the tubing coupling treated by the method is higher than the requirement of an API standard. The present invention solves the problem of thread gluing resisting technology in the aspect of producing stainless steel L80 (13Cr) oil pipes in China, and has the advantages of achieving an advanced world standard and filling up domestic blankness.
Description
Technical field
The present invention relates to a kind of process for treating surface of stainless steel oil pipe screw thread, particularly a kind of processing method that improves internal thread of stainless steel oil pipe collar case hardness and alramenting.Reach the anti-stick button ability of stainless steel oil pipe screw thread that improves.
Background technology
The oil field flow string is arranged on thousands of meters down-holes, and being threaded with casing coupling by sleeve pipe forms.Contain corrosive mediums such as carbon dioxide, hydrogen sulfide, hydrochloride and reduction bacterium in the well liquid of flow string surface contact, cause the corrosion of downhole oil tubing string.Cause the tubing string surface scale again because the mine water mineralization degree is high, produce underdeposit corrosion.The inside and outside surface of downhole oil tubing string is in badly, in the environment of seriously corroded.Selecting different oil pipe materials according to different geological environments is effectively to solve the tubing string corroding method.Nearly 2 years China begin to relate to the research and the production of stainless steel oil pipe, are used for the more serious stratum of downhole corrosion.Everybody is very clear, and stainless steel material (13Cr) has good resistance to corrosion, but hardness is low and more sticking, and its hardness is no more than HB220.The oil pipe made of stainless steel material is threaded when screwing with tubing coupling that stainless steel material is made like this, and the thread gluing phenomenon easily takes place.How to improve hardness, the phosphatization quality of stainless steel oil pipe collar thread surface, improve the problem of the anti-stick button ability of tubing round thread, become and put oil pipe manufacturer technical barrier in front at home.
According to new patent searching, improve the anti-stick button ability of plain tubing screw thread and can adopt and cross copper, cross method head it off such as zinc, but improve case hardness at the stainless steel oil pipe screw thread, improve and cross copper, cross zinc, the phosphatization quality, improve aspect the anti-stick button ability without any record.We are attempting crossing copper, crossing zinc processing stainless steel L80 (13Cr) tubing coupling with conventional method, and its result is very undesirable, even a bit anti-stick button ability does not all have to improve, and after screw thread screwed, thread gluing was serious.Inquiry tubing research institute of CNPC and big oil pipe manufacturer of domestic a few family all do not have any knowhow or are in conceptual phase.
The Chinese patent notification number is 1058758 patent of invention, disclosed the surface carburization heat treatment method of stainless steel formation high strength austenite surface course, through nitriding under temperature between 1000-1200 ℃, make stainless steel parts surface portion enrichment dissolved nitrogen near finished form.Nitrogen improves formed surface course intensity by solution strengthening, improves abrasion resistance.
Summary of the invention
The purpose of this invention is to provide a kind of stainless steel oil pipe collar thread surface processing method, improve internal thread of stainless steel oil pipe collar case hardness and phosphatization quality, reach the anti-stick button ability of stainless steel oil pipe screw thread that improves.Overcome the thread gluing phenomenon that stainless steel oil pipe thread surface hardness deficiency, phosphatization quality do not pass a test and cause.Stainless steel oil pipe can be promoted the use of, reduce the corrosion of well recovery tubing string.
The technical solution used in the present invention is:
The internal thread of stainless steel oil pipe collar surfacing, the preparation method that improves anti-stick button ability may further comprise the steps:
A, preliminary treatment: remove the internal thread of stainless steel oil pipe collar surface and oil contaminant, clear water is rinsed well, and oven dry or dried is naturally covered protection to external surface.
B, nitrogen treatment: stainless steel oil pipe collar is placed into nitriding furnace, carries out gas nitriding, and temperature 530-610 ℃, time 8-12 hour.
C, processing again: after removing the inside and outside surface and oil contaminant of stainless steel oil pipe collar, water cleans up, oven dry or dried naturally.
D, activation processing: it is that 5-10%, temperature are dipping 2-8 minute in 50-80 ℃ the aqueous hydrochloric acid solution that the stainless steel oil pipe collar after will handling again is placed on mass concentration, takes out and cleans with distilled water after clear water is washed again.
E, phosphatization are handled: the stainless steel oil pipe collar after will activating is put into the pond of crossing of manganese phosphating liquor, and phosphatization liquid concentration is 25-35g/L, and temperature is 90-95 ℃, and the time is 30-40 minute.
F, phosphatization post processing: the stainless steel oil pipe collar after the phosphatization is dried or dried up, and immersion oil is handled.
Through check, with the structure of the stainless steel oil pipe collar thread surface of processing method of the present invention production variation has taken place: the tubing coupling thread surface has the composite construction on bottom and top layer; Bottom is the iron nitride of iron nitride or carbon containing, and bed thickness is the 120-200 micron; The top layer is the manganese-series phosphorized film that manganese phosphating liquor forms, and bed thickness is the 15-25 micron.
Characteristics of the present invention are: the stainless steel oil pipe collar thread surface of handling through way of the present invention has the two layer composite structure that is different from original material.Improve by the box cupling thread surface hardness after this method processing, more than 600, the phosphatization quality reaches requirement to general hardness at HV.Obviously improve through testing its anti-stick button ability, solved the stainless steel oil pipe collar thread surface indeterminable thread gluing technical barrier of conventional method.
The specific embodiment:
Utilize surface treatment method of the present invention to produce 30 tons of stainless steel L80 (13Cr) oil pipe and drop into the down-hole use in Bohai Bay Oil.
Take following steps to carry out to surface treatment method of internal thread of stainless steel oil pipe collar:
A, preliminary treatment: remove stainless steel L80 (13Cr) oil tubing coupling internal thread surface and oil contaminant, clear water is rinsed well, oven dry, and external surface covers protection.
B, nitrogen treatment: into nitriding furnace is placed in stainless steel L80 (13Cr) tubing coupling, and the model of nitriding furnace is LD50.Carry out gas nitriding, 580 ℃ of temperature, 11 hours time.
C, box cupling are handled again: remove the inside and outside surface and oil contaminant of box cupling, water cleans up, oven dry.
D, activation processing: with stainless steel L80 (13Cr) tubing coupling be placed on that mass concentration is 8%, temperature is dipping 4 minutes in 60 ℃ the hydrochloric acid solution pond, take out and clean with distilled water again after clear water is cleaned.
E, phosphatization are handled: the pond of crossing of manganese phosphating liquor is put in stainless steel L80 (13Cr) tubing coupling after will activating, and phosphatization liquid concentration is 30g/L, and temperature is 95 ℃, and the time is 30 minutes.
F, phosphatization post processing: with the oven dry of stainless steel L80 (13Cr) tubing coupling after the phosphatization, immersion oil is preserved and is handled.
Through check, stainless steel L80 (13Cr) the tubing coupling thread surface that the present invention handles is composite construction.Bottom is an iron nitride, and bed thickness is 150 microns, and survey hardness is HV628; The top layer is the manganese-series phosphorized film that manganese phosphating liquor forms, and bed thickness is 21 microns and even.Can satisfy stainless steel L80 (13Cr) tubing coupling and stainless steel L80 (13Cr) oil pipe end screw thread screws, and the requirement of not thread gluing.Drop into the down-hole in Bohai Bay Oil and use, effect is very obvious.
Claims (4)
1, a kind of surface treatment method of internal thread of stainless steel oil pipe collar, improve stainless steel oil pipe collar thread surface hardness, improve interior threaded surface phosphatization quality, improve anti-stick button ability, it is characterized in that: surface treatment method of internal thread of stainless steel oil pipe collar may further comprise the steps:
A, preliminary treatment: remove the internal thread of stainless steel oil pipe collar surface and oil contaminant, clear water is rinsed well, oven dry or dried naturally, external surface protection;
B, nitrogen treatment: stainless steel oil pipe collar is placed into nitriding furnace, carries out gas nitriding, and temperature 530-610 ℃, time 8-12 hour;
C, box cupling are handled again: remove the inside and outside surface and oil contaminant of box cupling, water cleans up, oven dry or dried naturally;
D, activation processing: it is that 5-10%, temperature are dipping 2-8 minute in 50-80 ℃ the hydrochloric acid solution that the stainless steel oil pipe collar after will handling again is placed on mass concentration, takes out to clean up with distilled water after washing with clear water again;
E, phosphatization are handled: the stainless steel oil pipe collar after will activating is put into the pond of crossing of manganese phosphating liquor, and phosphatization liquid concentration is 25-35g/L, and temperature is 90-95 ℃, and the time is 30-40 minute;
F, phosphatization post processing: the stainless steel oil pipe collar after the phosphatization is dried or dried up, and immersion oil is handled.
2, handle a kind of stainless steel oil pipe collar that obtains according to the method for claim 1, it is characterized in that: the internal thread of stainless steel oil pipe collar surface has the composite construction on bottom and top layer.
3, stainless steel oil pipe collar as claimed in claim 2 is characterized in that: internal thread of stainless steel oil pipe collar surface bottom is an iron nitride, and bed thickness is the 120-200 micron; The top layer is the manganese-series phosphorized film that manganese phosphating liquor forms, and bed thickness is the 15-25 micron.
4, stainless steel oil pipe collar as claimed in claim 2 is characterized in that: stainless steel oil pipe collar thread surface bottom is the iron nitride of carbon containing, and bed thickness is the 120-200 micron; The top layer is the manganese-series phosphorized film that manganese phosphating liquor forms, and bed thickness is the 15-25 micron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100887726A CN1325747C (en) | 2005-08-02 | 2005-08-02 | Surface treatment method of internal thread of stainless steel oil pipe collar |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100887726A CN1325747C (en) | 2005-08-02 | 2005-08-02 | Surface treatment method of internal thread of stainless steel oil pipe collar |
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| CN1718992A CN1718992A (en) | 2006-01-11 |
| CN1325747C true CN1325747C (en) | 2007-07-11 |
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| CNB2005100887726A Active CN1325747C (en) | 2005-08-02 | 2005-08-02 | Surface treatment method of internal thread of stainless steel oil pipe collar |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101956188B (en) * | 2010-08-26 | 2012-08-08 | 无锡西姆莱斯石油专用管制造有限公司 | Anti-sticking method for screw threads of oil casting tube |
| CN105463367A (en) * | 2015-12-31 | 2016-04-06 | 芜湖市金宇石化设备有限公司 | Preparing method of treating fluid for thermal treating in automobile hand brake treating |
| CN105463368A (en) * | 2015-12-31 | 2016-04-06 | 芜湖市金宇石化设备有限公司 | Thermal treating technique for automobile hand brake processing |
| CN105648391A (en) * | 2015-12-31 | 2016-06-08 | 芜湖市金宇石化设备有限公司 | Thermal treatment process for automobile brake disc |
| CN106480398B (en) * | 2016-09-01 | 2018-10-30 | 宁波群力紧固件制造有限公司 | A kind of multiple thread and preparation method thereof based on carbo-nitriding technology |
| CN108505025B (en) * | 2018-07-03 | 2020-05-26 | 湖南金化科技集团有限公司 | Manganese phosphating solution and application thereof |
| CN109763092B (en) * | 2018-12-24 | 2020-04-24 | 钢铁研究总院 | Surface treatment method for enhancing corrosion resistance and wear resistance of oil-gas fracturing truck pump body |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1029325C (en) * | 1993-01-03 | 1995-07-12 | 孙克宁 | Oil pipe with nickel-phosphorus alloy anti-corrosion coating and its producing method |
| CN1396275A (en) * | 2002-08-16 | 2003-02-12 | 中国石化集团河南石油勘探局机械制造厂 | Laser heat treating technology for spiral threads of oil pipe and its connection hoop |
| US20040194859A1 (en) * | 2003-02-28 | 2004-10-07 | Yoshitaka Asou | Black hexavalent chromium-free plating treatment system |
| CN1607267A (en) * | 2003-10-16 | 2005-04-20 | 李天忠 | Process for preventing coupling corrosion and thread gluing of tubings |
-
2005
- 2005-08-02 CN CNB2005100887726A patent/CN1325747C/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1029325C (en) * | 1993-01-03 | 1995-07-12 | 孙克宁 | Oil pipe with nickel-phosphorus alloy anti-corrosion coating and its producing method |
| CN1396275A (en) * | 2002-08-16 | 2003-02-12 | 中国石化集团河南石油勘探局机械制造厂 | Laser heat treating technology for spiral threads of oil pipe and its connection hoop |
| US20040194859A1 (en) * | 2003-02-28 | 2004-10-07 | Yoshitaka Asou | Black hexavalent chromium-free plating treatment system |
| CN1607267A (en) * | 2003-10-16 | 2005-04-20 | 李天忠 | Process for preventing coupling corrosion and thread gluing of tubings |
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| CN1718992A (en) | 2006-01-11 |
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