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Lubricating coating composition suitable for lubrication of a threaded joint

A technology of lubricating coating and composition, applied in the field of lubricating coating composition, can solve the problems of unstable assembly torque, poor lubricity, reduced air tightness, etc., and achieve the effect of good rust resistance

Inactive Publication Date: 2006-10-18
NIPPON STEEL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] Due to the poor lubricity of rust, and due to swelling or spalling of the solid lubricant resin coating accompanying rust generation, the assembly torque required to tighten the rusted joint becomes less stable, more prone to galling, and gas Reduced tightness

Method used

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  • Lubricating coating composition suitable for lubrication of a threaded joint
  • Lubricating coating composition suitable for lubrication of a threaded joint
  • Lubricating coating composition suitable for lubrication of a threaded joint

Examples

Experimental program
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Effect test

Embodiment

[0137] In the following examples, with figure 2 The rotary tribometer shown evaluates the lubricity of lubricious coatings. This test has been shown to correlate well with tightening tests on threaded joints for oil well tubing. In this test, a pair of mating convex and concave test pieces 5, 6 are used. The convex test piece 5 to which a controlled load can be applied corresponds to a pin, which has a tapered end. The concave test piece 6 capable of rotating at a controlled speed corresponds to the case, and has the same concave surface as the conical shape of the convex test piece 5 . These two test pieces were made of the same steel material, which was Mn steel (carbon steel) or 13Cr steel (stainless steel) having the composition shown in Table 1, which was actually used to produce oil well pipes and connecting parts. A lubricious coating for evaluation was formed on the mating or contact surface 7 of the test piece.

[0138] Rust resistance was evaluated by the salt s...

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Abstract

A lubricating coating composition in which at least one basic lubricant selected from the group consisting of basic sulfonate, basic salicylate and basic phenolate is dissolved in a volatile organic solvent is coated on the On the friction surface of the box sleeve of the threaded joint and the bolt rod. The composition may also contain one or more thermoplastic resins, other lubricants and extreme pressure agents. The surface roughness Rmax of the friction surface is preferably 5-40 micrometers.

Description

technical field [0001] The present invention relates to a lubricating coating composition suitable for lubricating threaded joints of metal pipes, especially oil well pipes, and to a method of lubricating threaded joints with the composition. The lubricating coating composition of the present invention can impart sufficient lubricity and rust resistance to threaded joints for oil country tubular goods, and does not require the application of grease. Background of the invention [0002] Oil well pipes such as tubing and casing used in drilling crude oil and gas oil wells are generally connected to each other with threaded joints. The depth of oil wells in the past was generally 2000-3000 meters, while the depth of oil wells in recent offshore oil fields and other deep wells can reach 8000-10000 meters. [0003] Threaded joints used for oil well pipes are subject to various pressures in their use environment, including the weight of oil well pipes and threaded joints, the com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10M159/20F16L15/04C10N40/00C10N50/02C10M109/02C10M111/04C10M121/02C10M129/16C10M135/06C10M135/20C10M137/02C10M137/04C10M137/10C10M143/02C10M143/04C10M143/16C10M145/14C10M149/18C10M159/22C10M159/24C10M165/00C10M167/00C10M169/04C10N10/04C10N10/12C10N20/00C10N20/06C10N30/06C10N30/12C10N40/34E21B17/042
CPCC10M111/04C10M159/20C10M165/00C10M167/00C10M169/042C10M169/047C10M169/048C10M2203/065C10M2203/1006C10M2205/022C10M2205/0225C10M2205/024C10M2205/04C10M2205/043C10M2207/028C10M2207/0285C10M2207/126C10M2207/262C10M2207/2623C10M2207/289C10M2207/40C10M2209/084C10M2209/0845C10M2217/044C10M2219/044C10M2219/046C10M2219/0463C10M2219/089C10M2223/04C10M2223/045C10N2010/04C10N2020/06C10N2030/06C10N2030/12C10N2050/02C10N2080/00C10N2030/52F16L15/004F16L58/182
Inventor 后藤邦夫永作重夫山本秀男
Owner NIPPON STEEL CORP
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