Antiseptic wearable oil, sheathed tube liquid nitrogen quenching method

Abstract

The invention discloses a nitrogenization processing method that can process an oil pipe or a sleeve with a length diameter ratio being larger than 30 : 1. The method is that: the approximate middle part of an inner hole of the oil pipe or the sleeve is additionally provided with an auxiliary anode, and lifting holes of the oil pipe or the sleeve are arranged at the upper part of a furnace; air inlet devices are arranged on the furnace for every section, and a vacuum vent-hole is arranged at the lower end of the furnace; namely, the invention adopts deep hole nitrogenization technique such as the auxiliary anode and the forced air passing. Furthermore, such metal powders as Cr, Ti, Ni, etc. are added into a nitrogenization media, and three sections of nitrogenizations is adopted, finally a nitrogen seeping layer with a thickness of 0.5-2mm is formed at the surface of the oil pipe and the sleeve, the nitrogen seeping layer can obviously enhance such performances as surface hardness, anti-corrosion ability, abrasion resistance, etc. of the oil pipe or the sleeve, and thus prolonging the service life thereof.

Description

Technical field: [0001] The invention relates to a surface treatment method for oil and casing pipes used in oil fields, in particular to a method for treating the surface of oil and casing pipes using nitriding technology. Background technique: [0002] At present, various series of different forms of oil and casing produced by the existing technology at home and abroad have no anti-corrosion or hardening treatment on the inner and outer surfaces, or only have a single plating, anti-corrosion material or sintered glass lining on the inner surface. However, there are common problems such as low inner surface hardness, poor wear resistance, easy peeling of the surface anti-corrosion layer, resulting in pump jam accidents, polluting the environment and harmful to health, difficult quality assurance, high cost, low strength, and short service life of the product, etc. question. [0003] In the prior art, nitriding technology is also used to treat oil and casing, but the existi...

AI Technical Summary

Problems solved by technology

[0002] At present, various series of different forms of oil and casing produced by the existing technology at home and abroad have no anti-corrosion or hardening treatment on the inner and outer surfaces, or only have a single plating, anti-corrosion material or sintered glass lining on the inner surface. However, there are common problems such as low inner surface hardness, poor wear resistance, easy peeling of the surface anti-corrosion layer, resulting in pump jam accidents, polluting the environment and harmful to health, difficult quality assurance, high cost, low strength, and short service life of the product, etc. question

[0003] In the prior art, nitriding technology is also used to treat oil and casing, but the existing technology can only guarantee a good enough nitriding effect for products with a length-to-diameter ratio of less than 30:1, and cannot achieve deep hole nitriding At present, the main problem of deep hole nitriding is that the depth and hardness of the nitrided layer in the middle are very different from those at both ends, and the gradient value of surface hardness is very different.