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Tubular threaded joint and lubricating coating forming composition for use therein

a technology of lubricating coating and tubular threads, which is applied in the direction of hose connections, mechanical equipment, drilling pipes, etc., can solve the problems of increasing the torque rate and the inability to determine the optimal fastening torqu

Inactive Publication Date: 2015-07-09
VALLOUREC OIL & GAS FRANCE SAS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention relates to a surface treatment for the threaded and unthreaded metal contact portions of pins and boxes used in premium threaded joints. The treatment involves applying a lubricating coating to these surfaces using a composition that includes a lubricant and a metal soap. The resulting lubricating coating has a smooth surface and is effective in reducing friction and wear between the surfaces of the pins and boxes during use. The technical effect of the invention is improved performance and durability of the threaded joints.

Problems solved by technology

Then, when seal portions of the pin and the box come into contact with each other, and a rate of increase in torque increases.
As a result, optimal fastening torque may not be determined depending on tolerance in an amount of thread interference.

Method used

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  • Tubular threaded joint and lubricating coating forming composition for use therein
  • Tubular threaded joint and lubricating coating forming composition for use therein
  • Tubular threaded joint and lubricating coating forming composition for use therein

Examples

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examples

[0116]The effects of the invention will be illustrated by the following Examples and Comparative Examples. In the following description, a contact surface including a threaded portion and an unthreaded metal contact portion of the pin is referred to as “pin surface”, and a contact surface including a threaded portion and an unthreaded metal contact portion of the box is referred to as “box surface”. Surface roughness is Rmax. In addition, % represents % by mass unless otherwise stated.

[0117]A surface treatment shown in Table 2 was performed with respect to a pin surface and a box surface of a premium threaded joint VAM TOP (registered trademark) (outer diameter: 17.78 cm (7 inches), thickness: 1.036 cm (0.408 inches) formed from Cr—Mo steel A or 13% Cr steel B shown in Table 1. Then, a lubricating coating was formed on the pin surface and the box surface, which was subjected to the surface treatment, by an illustrated application method using a composition shown in Table 3 (MCA and ...

examples 1 , 4

Examples 1, 4, and 6, and Comparative Examples 2 and 3

[0133]With respect to tubular threaded joint formed from Cr—Mo steel having a composition A shown in Table 1, a manganese phosphate coating (Rz: 12 μm) having a thickness of 15 μm was formed on a box surface after grinding finish, and then a lubricating coating having a film thickness of 50 μm and a composition indicated in each of Examples and Comparative Examples of Table 3 was formed thereon by ambient temperature spray application. A zinc phosphate coating (Rz: 8 μm) having a thickness of 12 μm was formed on a pin surface after grinding finish, and then a lubricating coating was formed thereon in the same manner as the box surface.

example 2

[0134]With respect to a threaded joint formed from 13% Cr steel having a composition B shown in Table 1, first, Ni strike plating was formed on the box surface by electroplating after grinding finish, and then Cu plating having a thickness of 7 μm was formed thereon (total plating thickness: 8 μm). Rz of the plated surface was 2 p.m. A lubricating coating having a film thickness of 50 μm and a composition indicated in Example 2 of Table 3 was formed on the plated coating by ambient temperature spray application. A lubricating coating having a thickness of 50 μm was formed on the pin surface (Rz=2 μm) in the same manner as the box surface.

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Abstract

Provided is a composition for forming a lubricating coating to a tubular threaded joint. The composition contains a melamine cyanurate, a basic metal salt of an aromatic organic acid, and one or more kinds selected from the group consisting of a pine resin-based material, a wax, a metal soap, and a lubricating powder.

Description

TECHNICAL FIELD[0001]The present invention relates to a tubular threaded joint for use in connecting steel pipes and particularly oil country tubular goods, and a surface treatment method thereof.[0002]Priority is claimed on Japanese Patent Application No. 2012-174117, filed on Aug. 6, 2012, the content of which is incorporated herein by reference.BACKGROUND ART[0003]Oil country tubular goods such as tubing and casing used in oil well drilling for excavation of crude oil or gas oil are usually connected (jointed) to each other by a tubular threaded joint. In the past, the depth of the oil wells was 2,000 to 3,000 m, but in deep oil wells such as recent offshore oil fields, the depth may reach 8,000 to 10,000 m. The length of the oil country tubular goods is typically several tens of meters, and the periphery of tubing through which a fluid such as crude oil flows is surrounded with a plurality of casings, and thus the number of the oil country tubular goods jointed by the threaded j...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10M169/04E21B17/042
CPCE21B17/042C10M169/04C10M163/00C10M169/044C10M2201/041C10M2215/222C10M2203/1006C10M2205/16C10M2205/18C10M2207/125C10M2207/126C10M2219/046F16L58/182C10M2201/042C10M2205/163C10M2207/1253C10M2207/28C10M2207/2805C10M2209/10C10M2209/1003C10M2217/0403C10N2030/06C10N2030/12C10N2040/34C10N2050/023C10N2050/02C10N2080/00C10N2050/10C10N2010/04
Inventor GOTO, KUNIOTANAKA, YUUJI
Owner VALLOUREC OIL & GAS FRANCE SAS
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