Threaded tubular element for fatigue resistant threaded tubular joint and resulting threaded tubular joint

A technology for connecting structures and threaded pipes, applied in the direction of threaded connections, pipes/pipe joints/fittings, passing elements, etc., can solve problems such as inapplicability, and achieve the improvement of fatigue characteristics, static conditions, fatigue characteristics and static characteristics. Effect

Inactive Publication Date: 2003-05-07
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0033] The threads of patent application WO 98/50720 are also not suitable for interference threads where t

Method used

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  • Threaded tubular element for fatigue resistant threaded tubular joint and resulting threaded tubular joint
  • Threaded tubular element for fatigue resistant threaded tubular joint and resulting threaded tubular joint
  • Threaded tubular element for fatigue resistant threaded tubular joint and resulting threaded tubular joint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0117] figure 1 A threaded connection between two pipes 101, 101' of great length is shown.

[0118] The term "substantially long" refers to tubes that are several meters long, for example 10 meters long.

[0119] Conventionally, such tubing is a row of casing or production tubing or "riser" connected to form an oil and gas well, onshore or offshore; or a row of drill pipe for the same well.

[0120] Tubes can be made of all forms of non-alloy, light-alloy or high-alloy steel, or ferrous or non-ferritic alloys, to suit different working conditions: mechanical stress levels, or the corrosive nature of the fluid inside or outside the tube.

[0121] Pipes with low corrosion resistance can also be coated with a layer of, for example, synthetic material to prevent contact between steel and corrosive fluids.

[0122] The ends of the pipes 101, 101' comprise identical male threaded fittings 1, 1' and are connected by pipe couplings with female threaded fittings 2, 2' at each end. ...

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PUM

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Abstract

The invention concerns a threaded tubular element whereof the thread comprises at least a tangential connecting zone with multiple radii (21) at the thread root, in particular on the bearing flank (13). Said zone (21) comprises a main arc (23) of radius (rP1) whereof the circle intersects the flank (13) in one point (PRF1). The tangent in (PRF1) to said circle forms a strictly positive angle (D) with the flank (13). The secondary arcs (25, 27) of radii (rS1, and rT1) less than (rP1) provide the tangential connection of the main circle on the side of the flank (13), on the other side of the thread root (19). The radius (rP1) is greater than that (rH1) of the standard circle (29) which passes through (PRF1) and which would constitute alone a tangential connection zone. Such a threaded element provides a tubular threaded joint wherein it is integrated with good resistance to static as well as cyclic loads.

Description

technical field [0001] The invention relates to male or female pipe fittings of threaded pipe connections which are particularly resistant to static and cyclic stress. [0002] The invention also relates to threaded pipe connections which are particularly suitable for resisting static and cyclic stresses. Background technique [0003] A threaded pipe connection consists of a male fitting at the end of a first pipe and a female fitting at the end of a second pipe which can be a very long pipe or fitting. Such threaded connections are used in particular to constitute a row of casing or a row of production or drill pipes of an oil and gas well or similar well, such as a geothermal well. [0004] In American Petroleum Institute (API) Specification 5B, threaded connections between casings or between production tubing with tapered, trapezoidal or rounded triangular threads are disclosed. [0005] Other forms of threaded connections are also known using normal straight threads or...

Claims

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Application Information

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IPC IPC(8): F16L15/00F16L15/06
CPCF16L15/004
Inventor 莱昂内尔·弗迪朗
Owner NIPPON STEEL CORP
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