Finite Element Analysis Couples Casing and Cement Designs for HT/HP Wells in 
East Texas

Heathman, James; Beck, Frederick Eugene

doi:10.2523/98869-ms

Cited by 6 publications

(4 citation statements)

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“…Fleckenstein et al (2000) proposes finite element analysis as the best way to analyze the casing-cement-formation properties during the design phase. This proposal has been corroborated by other authors Gray (2007), Heathman and Beck (2006), Rodriguez et al (2003), Schubert et al (2002).…”

Section: Casing-cement -Formation Interactionssupporting

confidence: 77%

“…With FEA, stress variations at different points along the cement sheath radius can be effectively modeled. Several studies (Gray (2007), Heathman and Beck (2006), Rodriguez et al (2003), Schubert et al (2002)) show how finite element analysis was effectively used to model HTHP wells in order to understand and overcome cement sheath failure problem. Ravi et al (2002) sounds a note that cement which may be suitable under one set of conditions may not be suitable under a different set of conditions.…”

Section: Casing-cement -Formation Interactionsmentioning

confidence: 99%

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Estimation of Casing-Cement-Formation Interaction using a new Analytical Model

Teodoriu

Ugwu

Schubert

2010

SPE EUROPEC/EAGE Annual Conference and Exhibition

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The objective of this paper is to develop a better understanding of the performance of the casing -cement bond under HPHT well conditions, leading to a model to predict well life. An analytical model of wellbore stresses based on wellbore parameters was developed. The new model considers the casing as a thin wall cylinder, while cement and formation are modeled using a thick wall cylinder theory. Also the equivalent stress is calculated using different failure criteria that allow the user to simulate all possible load conditions on the casing-cement-formation system. The results were confirmed by finite element simulations. The new model that was implemented in an easy to use calculation sheet will give production engineers a simple tool to estimate the well integrity under various downhole conditions.

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Section: Casing-cement -Formation Interactionssupporting

confidence: 77%

Section: Casing-cement -Formation Interactionsmentioning

confidence: 99%

Estimation of Casing-Cement-Formation Interaction using a new Analytical Model

Teodoriu

Ugwu

Schubert

2010

SPE EUROPEC/EAGE Annual Conference and Exhibition

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“…All input values of casing internal pressure, in-situ stresses, and temperature in various deep gas wells as well as mechanical and thermal properties of casing, cement and formation were obtained from open literature. (Sweatman et al, 1995;Fleckenstein et al, 2000;Shaughnessy and Helweg, 2002;Nasr-El-Din et al, 2002;Al-Saeedi et al, 2006;Heathman and Beck, 2006;Al-Yami et al, 2008;Ginest et al, 2009;Wray et al, 2009). For all the cases formation horizontal stresses were assumed to be non-uniform based on mentioned literature data.…”

Section: Model Parametersmentioning

confidence: 99%

Finite Element Simulation of Downhole Stresses in Deep Gas Wells Cements

Nabipour

Joodi²,

Sarmadivaleh

2010

All Days

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Deep gas reservoirs are going to play more important roles in meeting growing demand of natural gas throughout the world. Due to extreme conditions of downhole stresses, pressure and temperature that occur in deep gas wells, maintaining cement mechanical integrity and zonal isolation have become critical concerns of industry during drilling, completion, and production of such wells. Cement sheath is expected to provide a flawless annular seal between casing and formation along the wellbore. However; cement failure cases which are being reported regularly show that there is still need for understanding extreme downhole conditions and the behavior of cement sheath experiencing such an environment. Although Uniaxial Compressive Strength (UCS) of cement is commonly regarded as the most important mechanical property of cement, recent theoretical and experimental results show that other mechanical properties of cement can be even more determinative in its failure.In this study, Finite Element Method (FEM), a widely-used robust numerical tool, is used for simulation of the downhole environment by modeling temperature, pressures, stresses, downhole materials and their interactions. Using this approach magnitude, direction and type of induced stresses in casing, cement, and formation have been determined. Furthermore; a series of sensitivity analyses was performed to reveal the effects of variation of various parameters such as casing internal pressure, differential horizontal stress and casing eccentricity, on the induced stresses in the cement sheath.Radial, tangential and von Mises stress profiles in the deep gas wells cements were investigated. Furthermore, the effect of casing internal pressure, differential horizontal stress and casing eccentricity were studied in the model. Results show that deep gas wells' cements experience extreme amounts of thermal and mechanical stresses and special consideration is required in cement selection.

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“…This technique eliminates the need to guess the initial state of stress, amount of plasticity and damage etc. In particular, the approach developed by Bosma, Ravi and co-workers [22][23][24] which is implemented in the DIANA software package [25], is not only used to improve the understanding of sealant behavior, but is also successfully utilized to evaluate the integrity of the cement sheath in offshore wells [26] and to redesign the casing and cement sheath to match extreme loading conditions in previously failed wellbores [27]. Pattillo and Kristiansen [28] implemented a staged finite element model using the ABAQUS software package [29] and successfully applied it to the analysis of horizontal casing integrity.…”

Section: Literature Reviewmentioning

confidence: 99%

Finite Element Studies of Near-Wellbore Region During Cementing Operations: Part I

Podnos

Becker

2007

All Days

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fax 01-972-952-9435. AbstractA wellbore cement sheath is expected to provide zonal isolation and borehole integrity during well construction and well life. Cement sheaths mechanically interact with other elements in the wellbore region to stresses from geological processes and operational activities. Quantifying these interacting physical components and processes has technical, economic, and environmental implications of great, and growing, significance.Staged finite element procedures during well construction sequentially consider the stress states and displacements at and near the wellbore. The model replicates complicated stress states arising from simultaneous action of far-field stresses, overburden pressure, cement hardening and shrinkage, debonding at the interfaces, and plastic flow of cement sheath and rock formation. Presently, temperature and flow are not included. The technique tracks the time-dependent behavior of cement slurry, curing (with or without shrinkage), and hardened cement during the critical period after slurry placement.Material models for casing, cement and rock formation, failure criteria for cement, formation and interface bonds were calibrated using published information and experimental data. Calculations were conducted for various loading and unloading scenarios, geometric configurations, properties of rock formations, and cement slurry formulations. Results are discussed in terms of field implications, for example: (1) interface micro-channels may or may not develop, depending upon shrinkage magnitudes; (2) simplifying modeling assumptions that are often used, such as 2-D stresses and/or deformations, may obscure critical casing, cement, and formation behavior in the wellbore region, and in the producing horizon.This paper, part of a series quantifying the interacting physical components and processes at and near the wellbore region, initiates useful comparisons of analytical results and field realities. The series illustrates and compares results and practical implications for simple to increasingly complex, but more realistic assumptions, such as isotropic/directional stress states, and isotropic/anisotropic casing, cement, and formation material parameters.

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Finite Element Analysis Couples Casing and Cement Designs for HT/HP Wells in East Texas

Cited by 6 publications

References 0 publications

Estimation of Casing-Cement-Formation Interaction using a new Analytical Model

Estimation of Casing-Cement-Formation Interaction using a new Analytical Model

Finite Element Simulation of Downhole Stresses in Deep Gas Wells Cements

Finite Element Studies of Near-Wellbore Region During Cementing Operations: Part I

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