Lubricating coating composition suitable for tubular threaded joints

A lubricating coating and composition technology, applied in the field of lubricating coating compositions, can solve the problems of deteriorating working environment, environmental pollution, reducing the operating efficiency of OCTG installation, etc., and achieve the effects of improving sealing performance and high biodegradability

Inactive Publication Date: 2009-09-16
NIPPON STEEL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the applied grease causes environmental pollution if it is washed off or drained around it
In addition, the process of applying compound grease deteriorates the working environment and reduces the operational efficiency of installing OCTG

Method used

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  • Lubricating coating composition suitable for tubular threaded joints
  • Lubricating coating composition suitable for tubular threaded joints
  • Lubricating coating composition suitable for tubular threaded joints

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0123] A lubricating coating composition was prepared, which contained 25% mineral spirits as a dissolution medium, 50% (66.7 parts) of basic calcium sulfonate with a base value of 400 mg-KOH / g as a basic lubricant, and 17% ( 22.7 parts) of calcium stearate and 8% (10.6 parts) of petrolatum wax, both as additional lubricants. The parts in parentheses are the amounts of the respective components in parts by mass based on 100 parts by mass of the total amount of components in the composition excluding the dissolution medium.

Embodiment 2

[0127] A lubricious coating composition was prepared which contained no dissolution medium but contained 65% of the same basic calcium sulfonate as used in Example 1 as a basic lubricant, and 23% of calcium stearate and 12% of Petrolatum wax, both act as other lubricants.

[0128] Since this lubricating coating composition does not contain a dissolving medium, it has a high viscosity at room temperature, it is preheated to 60°C to reduce its viscosity, and then applied by brushing on the surface to be used for repeated fastening and loosening tests On the surface of the test box of the test threaded joint and on the surface of the test plate for the salt spray test. On the other hand, due to the absence of a dissolution medium, it has good biodegradability, and the biodegradability of the entire lubricating coating composition in seawater (BOD 28 ) was 36%, which is well above the minimum acceptable value of 20%, and higher than the value of the composition of Example 1 conta...

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Abstract

A tubular threaded joint for connecting tubing or casing used to excavate oil wells have a lubricating coating formed from a lubricating coating composition comprising one or more basic lubricants selected from a basic sulfonate salt, a basic salicylate salt, a basic phenate salt, and a basic carboxylate salt and having biodegradability value (BOD) of at least 20% when measured after 28 days in seawater. The joint can be used without application of a compound grease containing heavy metals even in a country or region having severe environmental regulations.

Description

technical field [0001] The present invention relates to a lubricating coating composition suitable for the lubricating coating treatment of tubular threaded joints for connecting oil industry pipes (abbreviated as OCTG) to each other. [0002] A tubular threaded joint with a lubricating coating formed by treatment with the composition according to the present invention can be used to connect OCTG without applying a lubricating grease containing a large amount of heavy metals, thereby raising concerns about causing environmental pollution, even if the joint is There are types with non-threaded metal-to-metal contacts that provide improved sealing to the joint, but which make the joint prone to galling. Background technique [0003] OCTG is tubing and casing used to excavate oil wells. They are usually installed on site by connecting steel pipes having a length of more than ten meters to each other using tubular threaded joints. Generally, oil wells are 2,000 to 3,000 meters...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M169/04C10M101/02C10M105/04C10M105/22C10M105/68C10M107/04C10M107/18C10M109/00C10M109/02C10M159/20C10M159/22C10M159/24F16L15/04C10N10/04C10N30/00C10N30/06C10N30/12C10N40/00C10N50/02
CPCC10M105/16C10M2207/2623C10M2205/022C10N2280/00C10M169/04C10M105/24C10M2207/126C10M2205/163C10M2205/143C10N2250/10C10M105/28C10N2230/12C10M2205/17C10M2205/173C10M2207/0235C10M2215/0806C10M2205/0225C10M2205/18C10M2205/183C10N2250/121C10M105/72C10N2230/06C10M2205/14C10M2219/0463C10M2207/1253C10M2207/0285C10N2230/64C10M2205/16C10N2030/06C10N2030/12C10N2050/02C10N2050/10C10N2080/00C10N2030/64E21B17/042F16L15/04C10N2010/04
Inventor 今井竜一后藤邦夫
Owner NIPPON STEEL CORP
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