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Lubricating coating composition suitable for tubular threaded joints

a technology for tubular threaded joints and coating compositions, applied in the preparation of carboxylic compounds, screw threaded joints, organic compounds of the 3/13 element group, etc., can solve the problems of increasing environmental regulations, difficult use, and inability to assess the environmental impact of coating compositions, and achieve satisfactory galling resistance and anticorrosion properties, high biodegradability, and no environmental pollution.

Inactive Publication Date: 2009-10-22
VALLOUREC OIL & GAS FRANCE SAS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0017]A more specific object of the present invention is to provide a tubular threaded joint which can be used to connect OCTG without application of a lubricating grease such as a compound grease and without problems related to lubricity, which is prevented from rusting and exhibits improved galling resistance and airtightness, and which can be used even in countries or regions having strict environmental regulations.
[0024]Among these methods, the one which is more suitable for the particular sample should be employed. In either testing method, the test result is indicated in percent (e.g., BOD=15%), and the larger the BOD value, the higher the biodegradability, which indicates a lower impact on the environment.
[0035]The present invention also provides a tubular threaded joint constituted by a pin and a box each having a threaded portion and an unthreaded metal-to-metal contact portion as engaging portions, characterized in that the surfaces of the engaging portions of at least one of the pin and the box are coated with the above-described lubricating coating composition to a thickness of at least 10 micrometers, thereby allowing the joint to be tightened without application of a compound grease.
[0037]A tubular threaded joint having a lubricating coating formed from a lubricating coating composition according to the present invention has high biodegradability and still exhibits satisfactory galling resistance and anticorrosive properties on the same level as obtained with application of a compound grease. As a result, it can be used without application of a compound grease and without any concern for environmental pollution even in a country or region having strict environmental regulations.

Problems solved by technology

For a tubular threaded joint, an environmental impact assessment of a compound grease is of course required, since its use unavoidably involves application and washing operations on a rig.
However, although the lubricity and anticorrosive properties of lubricating coatings and coating compositions which have been proposed in the prior art are taken into consideration, their compositions are not designed with consideration of biodegradability, which is now an important item requiring assessment, and they have not been assessed with respect to their environmental impact.
Therefore, their use has become difficult under recent conditions in which environmental regulations are becoming increasingly strict.

Method used

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Examples

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example 1

[0109]A lubricating coating composition was prepared which contained 25% of mineral spirit as a dissolving medium, 50% (66.7 parts) of basic calcium sulfonate having a base number 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 the components in the composition excluding the dissolving medium.

[0110]This lubricating coating composition contained a dissolving medium and thus had a low viscosity and a high spreadability, so it was easy to apply and could be applied by brush coating to the box surface of a test threaded joint to be used in a repeated tightening and loosening test and the surface of a test sheet for a salt spray test while remaining at room temperature. On the other hand, due to the presence of a dissolving medium which does not have good...

example 2

[0112]A lubricating coating composition was prepared which did not contain a dissolving 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 as additional lubricants.

[0113]Since this lubricating coating composition did not contain a dissolving medium and thus had a high viscosity at room temperature, it was previously heated to 60° C. to lower its viscosity and then applied by brush coating to the box surface of a test threaded joint to be used in a repeated tightening and loosening test and the surface of a test sheet for a salt spray test. On the other hand, due to the absence of a dissolving medium, it had good biodegradability, and the biodegradability (BOD28) of the entire lubricating coating composition in seawater was 36%, which greatly exceeded the minimum acceptable value of 20%, and was higher than that of the composition of Example 1 containing a dissolving medium...

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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]This invention relates to a lubricating coating composition suitable for lubricating coating treatment of tubular threaded joints which are used to connect oil country tubular goods (abbreviated as OCTG) to each other.[0002]A tubular threaded joint having a lubricating coating formed by treatment with a composition according to the present invention can be used to connect OCTG without application of a lubricating grease which contains a large amount of heavy metals and hence raises the a concern of causing environmental pollution, even if the joint is of the type having an unthreaded metal-to-metal contact portion which provides the joint with improved sealability but which makes the joint susceptible to galling.BACKGROUND ART[0003]OCTG are tubing and casing which are used to excavate oil wells. They are normally assembled on site by connecting steel tubes having a length on the order of ten some meters to each other using tubular threaded joints. Conventionally...

Claims

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Application Information

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IPC IPC(8): C10M135/10C10M129/48C10M129/26
CPCC10M2205/022C10N2250/121C10M2207/1253C10M2207/2623C10M2219/0463C10N2230/06C10N2230/12C10N2230/64C10N2280/00C10M2207/0235C10N2250/10C10M2207/126C10M2207/0285C10M169/04C10M2205/14C10M2205/16C10M2205/17C10M2205/18C10N2210/02C10N2030/06C10N2030/12C10N2050/02C10N2050/10C10N2080/00C10N2030/64E21B17/042F16L15/04C10N2010/04
Inventor IMAI, RYUICHIGOTO, KUNIO
Owner VALLOUREC OIL & GAS FRANCE SAS
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