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Threaded joint for oil well pipe and composition for light-curable film covering

A threaded joint, light curing technology, used in pipe joints, threaded connections, lubricating compositions, etc., can solve the problems of low lubricity and wear resistance, and achieve the effect of excellent rust resistance and wear resistance

Active Publication Date: 2017-03-22
NIPPON STEEL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Similarly, even the threaded joint disclosed in Patent Document 4 may have low lubricity and wear resistance in an extremely low temperature environment.

Method used

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  • Threaded joint for oil well pipe and composition for light-curable film covering
  • Threaded joint for oil well pipe and composition for light-curable film covering
  • Threaded joint for oil well pipe and composition for light-curable film covering

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Embodiment

[0139] Hereinafter, the present invention will be illustrated based on examples. However, the present invention is not limited by the Examples. In the embodiments, the contact surface of the pin is called the pin surface, and the contact surface of the box is called the box surface. Unless otherwise specified, % in an Example is mass %.

[0140] A plurality of oil well pipe threaded joints manufactured by Nippon Steel & Sumitomo Metal Corporation (trade name VAM21) were prepared. Each OCTG had an outside diameter of 244.48 mm (9-5 / 8 inches) and a wall thickness of 1.199 cm (0.472 inches). The oil well pipe is carbon steel, and its chemical composition is as follows: C: 0.21%, Si: 0.25%, Mn: 1.1%, P: 0.02%, S: 0.01%, Cu: 0.04%, Ni: 0.06%, Cr: 0.17 %, Mo: 0.04%, and the balance is iron and impurities.

[0141] [Process of forming a film on the surface of the pin]

[0142] The next base treatment is performed on the surface of the pin. The surface of the pin was mechanicall...

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Abstract

Provided is a threaded joint for an oil well pipe with which it is possible to suppress the increase in torque when a pin and a box are linked in a cold region. The threaded joint (1) for the oil well pipe of the present embodiment is provided with the pin (2) and the box (3). The pin (2) and the box (3) have respective contact surfaces (21, 31) having threaded parts (22, 32) and threadless metal contact parts (23, 33). The contact surface (21) of the pin (2) is provided with a light-curable film covering (25) as the uppermost layer. The light-curable film covering (25) contains a light-curable resin and perfluoro polyether. The contact surface (31) of the box (3) is provided with a solid lubricating film covering (35) as the uppermost layer.

Description

technical field [0001] The present invention relates to a threaded joint for oil well pipes and a composition for photocurable coating formed on the threaded joints for oil well pipes. Background technique [0002] Oil country tubular goods (OCTG) are used for excavating oil wells and natural gas wells (hereinafter referred to as "oil wells"). Oil country tubular goods are, for example, pipes and casings. Fluids such as crude oil or natural gas flow inside the pipeline. Oil well pipes are generally connected to each other using oil well pipe threaded joints. In the past, the depth of the oil well was 2000-3000m. However, for recent offshore oil wells and the like, the depth of the oil wells has reached 8,000 to 10,000 m. The length of one steel pipe used as an oil well pipe is generally tens of meters. Therefore, the number of these oil well pipes used in oil well excavation is more than 1,000. [0003] Threaded joints for oil well pipes generally have pins and boxes. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L15/04E21B17/042
CPCE21B17/042F16L15/04C10M169/02C10M111/02C10M111/04C10M2201/042C10M2201/062C10M2205/0225C10M2205/183C10M2207/026C10M2207/125C10M2209/084C10M2223/041C10M2229/041C10N2010/10C10N2010/08C10N2030/06C10N2010/04C10N2050/08C09D123/00C10M169/00F16L58/1009F16L2201/40
Inventor 后藤邦夫M·派逖特
Owner NIPPON STEEL CORP
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