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Fatigue Resistant Flexible 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: 2016-03-09
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 Flexible Tubing
  • Fatigue Resistant Flexible Tubing
  • Fatigue Resistant Flexible 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 method of making a length of pipe can produce a fatigue resistant length of pipe having a relatively high fatigue resistance and a relatively small strip-to-strip weld length. Fatigue resistance is calculated from an experimental setup with control parameters and / or a simulation replicating similar material properties and loading conditions. High fatigue resistance means that certain product characteristics, such as low plasticity, low hydrostatic stress levels and defect-free welds, can be maintained after a specific number of tested cyclic loadings with adequate weld offset design at low values. The relatively small strip-to-strip weld length reduces the likelihood of crack initiation and / or propagation at weld locations where defects and local differences in mechanical properties often cause failure. Small strip-to-strip weld lengths can also reduce weld costs.

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 Patents(China)
IPC IPC(8): B21C37/08E21B17/20
CPCB21C37/0826B21C47/247F16L9/16B23K31/02B23K2101/16E21B19/22F16L9/02B21C37/08B23K31/027
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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