Collapse of Thick Wall Pipe in Ultra Deep Water

Verner, Edward A.; Langner, Carl G.; Reifel, Michael D.

doi:10.1061/(asce)0733-947x(1985)111:5(485)

Cited by 11 publications

(7 citation statements)

References 24 publications

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“…The diameter variation around the circumference was measured at six to eight stations along the tube length. An imperfection parameter defined as follows was established (following [1]): D" 'min represent the maximum and minimum diameters measured at a given longitudinal position. The maximum measured value of A 0 along the tube was adopted as the imperfection variable.…”

Section: Collapse Experimentsmentioning

confidence: 99%

“…2(c). (For this case, A" = w 0 /R 0 ; see equation (1).) The ovality will be prescribed to be relatively small in amplitude and uniform over the length of the tube.…”

Section: Problem Formulationmentioning

confidence: 99%

“…Exploration of offshore areas with water depths between 1000 ft (300 m) and 7000 ft (2100 m) is on the increase [1,2]. Examples are the exploration drillings in the deeper OCS leases of the Gulf of Mexico (1000-3000 ft), the offshore of California (up to 1500 ft), drilling in the areas north of the Shetland Islands in the U.K. (4500 ft), off Newfoundland (4900 ft) and the recent exploration in the deep Baltimore Canyon (5000-7000 ft) as well as others.…”

Section: Introductionmentioning

confidence: 99%

“…Tubular structures such as pipelines, risers and well casing will have to withstand the high loads dictated by the extreme depth as well as the installation method used. Marine pipelines are most vulnerable during installation and subsequently during periodic depressurization of the lines [1,2], During installation and depending on the laying method used, sections of the line can experience combined pressure, bending and tension loads. Eventually the pipe reaches the sea floor and depending on the terrain can be considered, in most cases, to be relatively free of other loads but the external pressure.…”

Section: Introductionmentioning

confidence: 99%

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On the Collapse of Inelastic Thick-Walled Tubes Under External Pressure

Yeh

Kyriakides

1986

Journal of Energy Resources Technology

113

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The collapse of long thick-walled tubes under external pressure is studied both experimentally and analytically. A two-dimensional nonlinear formulation of the problem is presented. The formulation is general enough to include initial geometric imperfections of the tube cross section such as initial ovality and wall thickness variation. In addition the effects of residual stresses and of initial inelastic anisotropy are considered. Experiments on tubes with D/t values between 10 and 40 were carried out. Good agreement between experiments and theory is shown to occur provided all parameters are modeled correctly. A study of the effect of the various parameters of the problem on the collapse pressure is also presented. Downloaded From: http://energyresources.asmedigitalcollection.asme.org/ on 05/24/2015 Terms of Use: http://asme.org/terms 36/ Vol. 108, MARCH 1986 Transactions of the ASME Downloaded From: http://energyresources.asmedigitalcollection.asme.org/ on 05/24/2015 Terms of Use: http://asme.org/terms Journal of Energy Resources Technology MARCH 1986, Vol. 108/37 Downloaded From: http://energyresources.asmedigitalcollection.asme.org/ on 05/24/2015 Terms of Use: http://asme.org/terms

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Section: Collapse Experimentsmentioning

confidence: 99%

“…2(c). (For this case, A" = w 0 /R 0 ; see equation (1).) The ovality will be prescribed to be relatively small in amplitude and uniform over the length of the tube.…”

Section: Problem Formulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On the Collapse of Inelastic Thick-Walled Tubes Under External Pressure

Yeh

Kyriakides

1986

Journal of Energy Resources Technology

113

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“…However, the results of experimental and analytical studies [18,19] indicate that the geometric imperfections can drastically reduce the collapse pressures. The two types of geometric imperfections are ovality and eccentricity of casing.…”

Section: Simulation Resultsmentioning

confidence: 99%

Numerical simulations of casing collapse: a case study in the South of Iran

Gholami¹,

Rasouli²

2012

Petroleum and Mineral Resources

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Collapse of casings during production has been reported on many occasions in different fields. Regardless of the root for the failure of the casings, this is due to stresses applied to the casing exceeding its ultimate strength. Failure of the casing similar to any pipe could be due to compressional, tensional, and burst or collapse forces due to various loads being applied to the casing string. Although several analytical models have been developed based on elastic or plastic approaches to estimate the ultimate strength of casing, it has been shown that these methods underestimate the casing strength. Casings' mechanical and geometrical parameters, effective in-situ stresses, temperature, formation properties and other intervening are simultaneously required for a complete design of casing. To simulate the failure of casing in the presence of various forces, numerical modeling is a robust approach that can be employed. In this study, finite element simulation was used through the use of ABAQUS software to model the failure of casings in one of the wells located in the southern part of Iran. The results revealed that increasing the diameter to thickness (D/t) ratio decreases the ultimate strength of casing, leading to unexpected failure in the wells under consideration. It was also shown that eccentricity drastically reduces the strength of casing. Since the numerical results of current study were in an acceptable agreement with experimental studies, numerical simulation method proposed here can be used to predict the casing collapse.

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