Title:
METAL PIPE FOR OIL WELLS
Document Type and Number:
WIPO Patent Application WO/2024/005167
Kind Code:
A1
Abstract:
Provided is a metal pipe for oil wells, the pipe having outstanding high-torque performance. A metal pipe for oil wells (1) according to the present disclosure comprises a main pipe body (10). The main pipe body (10) has a pin (40) and a box (50). The pin (40) includes a pin contact surface (400) including a male pin section (41). The box (50) includes a box contact surface (500) including a female screw section (51). The metal pipe for oil wells (1) further comprises a resin coating film (100) formed as a top layer on at least either the pin contact surface (400) or the box contact surface (500). The resin coating film (100) includes an epoxy resin. The resin coating film (100) was measured using a 1 H pulse NMR method, and when the obtained free induction decay signal was divided into three components in order from components with longer spin-spin relaxation time T2, namely a high-mobility component, a medium-mobility component, and a low-mobility component, the weighted average of the spin-spin relaxation time T2 of the three components is 110.0 µs or less.
Inventors:
AKIOKA KOJI (JP)
MATSUYAMA TOMOYA (JP)
KURANISHI TAKAO (JP)
ISHII KAZUYA (JP)
YAMAOKA IKURO (JP)
MATSUYAMA TOMOYA (JP)
KURANISHI TAKAO (JP)
ISHII KAZUYA (JP)
YAMAOKA IKURO (JP)
Application Number:
PCT/JP2023/024285
Publication Date:
January 04, 2024
Filing Date:
June 29, 2023
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
VALLOUREC OIL & GAS FRANCE (FR)
VALLOUREC OIL & GAS FRANCE (FR)
International Classes:
F16L15/04
Domestic Patent References:
| WO2022045209A1 | 2022-03-03 | |||
| WO2020145162A1 | 2020-07-16 |
Foreign References:
| JPH04101890U | 1992-09-02 | |||
| JP2022000536A | 2022-01-04 | |||
| JP2013205084A | 2013-10-07 | |||
| JP2015232703A | 2015-12-24 |
Attorney, Agent or Firm:
ASCEND IP LAW FIRM (JP)
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