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Fatigue Resistant Coiled Tubing

A linear, metal pipe technology, applied in the field of metal pipes and their manufacturing, can solve problems such as failure of flexible pipes

Active Publication Date: 2014-09-17
TENARIS COILED TUBES LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, flexible pipe can still fail occasionally and prematurely when cyclic loading causes crack initiation and / or propagation in the pipe

Method used

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  • Fatigue Resistant Coiled Tubing
  • Fatigue Resistant Coiled Tubing
  • Fatigue Resistant Coiled Tubing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0055] The present invention relates to a length of metal pipe and a method for its manufacture.

[0056]Typically, during wellbore related operations, such as drilling, the flexible metal tubing is subjected to cyclic loading and various pressurizations due to repeated coiling and / or uncoiling from a reel. The number of coil-up and uncoil cycles without failure (such as a rupture or other leak) can be an indication of the life of the metal tube. When a crack initiates and propagates in flexible metal tubing, premature failure typically occurs near the strip-to-strip weld. Crack initiation may be due to certain stresses and strains as well as welding defects. The present invention describes a section of coilable metal tubing that has a cut profile at the strip-to-strip weld to aid in resistance to fatigue stress and strain states, while having a short weld length to reduce the likelihood of defects. In metal tubes, metal strips are known to be welded in simple straight cut p...

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Abstract

The disclosed manufacture method for a length of tubing can produce a length of fatigue resistant tubing that has relatively high fatigue resistance and relatively low strip-to-strip welding length. The Fatigue resistance is calculated from experimental settings with controlled parameters and / or simulations reproducing similar material properties and loading conditions. A high fatigue resistance means certain product characteristics (e.g., low plasticization, low hydrostatic stress levels and free of imperfections welds) can be retained with an adequate bias weld design at low values after a specific test number of cyclic loading. The relatively low strip-to-strip welding length is an advantage for reducing probabilities of having cracks initiated and / or propagated at weld locations, where imperfections and localized differences of mechanical properties commonly cause failure. Low strip-to-strip welding length can also reduce the costs for welding.

Description

technical field [0001] The present invention relates to metal pipes and methods for their manufacture. Background technique [0002] The metal pipe of the present invention can be used in flexible pipe strings. Flexible tubing is a continuous length of metal tubing wound on a reel. The metal pipe may in practice be made of a flat composite metal strip made of two separate strips welded together end-to-end. The composite metal strip is then rolled into a cylindrical / tubular shape and welded at the longitudinal edges to form a length of pipe. Depending on specific application needs, coiled tubing can be produced in different lengths, up to and beyond 10,000 meters (or approximately 30,000 feet). Because flexible tubing is of considerable length, it is usually stored or shipped on reels. [0003] During operation, the flexible tube is repeatedly wound onto and uncoiled from its mandrel. Flexible pipe is also subjected to various internal pressurizations, including superele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/08E21B17/20
CPCE21B19/22B23K31/027B21C47/247B21C37/0826B23K2201/16F16L9/02F16L9/16B23K31/02B23K2101/16B21C37/08
Inventor S·克拉韦罗M·瓦尔德斯J·迈特H·A·恩斯特R·S·格拉德克泰因
Owner TENARIS COILED TUBES LLC
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