Deformation Capacity Of Steel Tubes In Deep Water

Winter, D. A. Matthijs de; Peter, E. C. Nirmala

doi:10.4043/4035-ms

Cited by 4 publications

(1 citation statement)

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“…The collapse pressures determined using the FEA models of the intact API 5 L X65 pipes modeled with S4R and C3D8R elements are shown in Fig. 5 along with the collapse pressures determined using the analytical equation (De Winter 1981;Det Norske Veritas, 2012) for elastic-plastic collapse under uniform external pressure. The analytical collapse pressure, P c , for a circular cylinder pipe with nominal outer diameter D and wall thickness t, made from a material with Young's modulus, E, Poisson's ratio, ν, and subject to external pressure is given by (Det Norske Veritas, 2012)…”

Section: Element Type Selectionmentioning

confidence: 99%

An Investigation on the Effect of Widespread Internal Corrosion Defects on the Collapse Pressure of Subsea Pipelines

Olatunde¹,

Sriramula²,

Siddiq

et al. 2023

Preprint

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Section: Element Type Selectionmentioning

confidence: 99%

An Investigation on the Effect of Widespread Internal Corrosion Defects on the Collapse Pressure of Subsea Pipelines

Olatunde¹,

Sriramula²,

Siddiq

et al. 2023

Preprint

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Collapse Ratings of Cold Expanded Line Pipe Used as Casing

Miller¹,

Stewart²,

Owoeye³

et al. 2019

Day 1 Mon, September 30, 2019

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API Specification 5L (2018) pipe is commonly used as surface casing. Recent deepwater failures have led to a review of collapse performance of 5L pipe as part of the larger root cause investigation. A survey of pipeline industry publications generated a database of over 80 collapse tests of cold-expanded line pipe. The data are compared to casing collapse ratings per API Technical Report 5C3 (2018) and to alternative ratings included in API Recommended Practice 1111 (2015) for offshore pipelines and in the submarine pipeline standard DNVGL-ST-F101 (2017). The comparison showed that the pipeline ratings provide a better fit to the collapse data and that API TR 5C3 overpredicts collapse performance of the subject pipe. Further investigation revealed that, for two operators, the vast majority of offshore surface casing is line pipe that has been cold-expanded without stress relief. Several risk mitigation alternatives were considered. In the short term, the risk can be managed through learning bulletins, design guidelines and operational procedures. The preferred mitigation is to change the collapse rating for cold-expanded line pipe used as casing. This is a long-term solution involving industry standards and the subsequent adoption through commercial design software. The work described in this paper has led to a ballot change for the next edition of API TR 5C3. This paper is presented to provide drilling industry awareness of the lower collapse performance of cold-expanded line pipe and to add context for selection of an appropriate alternative rating.

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Collapse and Post Collapse Behaviour of Tubulars: A Simple Approach

Abbassian

Parfitt

1995

All Days

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SPE Members Abstract This paper describes a simple method of evaluating the collapse strength and post collapse behaviour of oil field tubulars subjected to external pressure. The method is based on elastic ovalisation and subsequent plastic collapse by formation of a four-hinge mechanism. The resulting predictions of collapse strength are compared with available collapse test data, and other existing collapse equations. For post collapse behaviour, model predictions are compared with available experimental and numerical data. Applications of the method to collapse of perforated and slotted liners, prepacked screens and collapse under non-uniform loading are described. Introduction Collapse due to excessive external pressure is one of several failure modes against which oil field tubulars are designed. Due to long lengths of tubulars used in a well, unduly conservative design can carry an undesirable penalty on well cost. On the other hand under-design increases risk of failure and the associated trouble cost. Collapse of tubulars has therefore been studied by numerous investigators and various collapse strength equations have been proposed. Present design guidelines such as those published by API for design of intact tubulars against uniform collapse loading are used extensively by the oil Industry. These guidelines are semi-empirical based in part on full scale collapse test data and therefore incorporate various assumptions and restrictions on degree of ovality, material yield stress range, diameter to thickness ratio (D/t), thickness tolerance, nature of pressure loading, amongst others. However in some special circumstances these design guidelines can no longer be readily applied. Examples of these are perforated and slotted production liners, pre-packed screens, tubes with known excessive initial ovality, and casing under non-uniform pressure loading. These situations are usually addressed by numerical analysis or through full scale test programmes. Both involve high cost and as such are more suitable for specific design cases rather than for the generation of design guidelines. This paper describes a simple method of calculating collapse and post collapse strengths of tubulars subjected to external pressure. The method is based on pre-collapse elastic ovalisation and subsequent plastic collapse through the formation of four plastic hinges. The calculation approach is readily applicable to collapse analysis of perforated and slotted liners and also to casings under non-uniform pressure. In this paper collapse strength predictions are compared with a set of full-scale collapse test data, API design guidelines and a number of other existing collapse equations. For post collapse behaviour, model predictions are compared with available numerical data. Application to collapse assessment of perforated and slotted liners, prepacked screens and to collapse under nonuniform external loading are discussed. P. 149

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Deformation Capacity Of Steel Tubes In Deep Water

Cited by 4 publications

References 0 publications

An Investigation on the Effect of Widespread Internal Corrosion Defects on the Collapse Pressure of Subsea Pipelines

An Investigation on the Effect of Widespread Internal Corrosion Defects on the Collapse Pressure of Subsea Pipelines

Collapse Ratings of Cold Expanded Line Pipe Used as Casing

Collapse and Post Collapse Behaviour of Tubulars: A Simple Approach

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