First High-Temperature Applications of Anti-Gas Migration Slag Cement and Settable Oil-Mud Removal Spacers in Deep South Texas Gas Wells

Sweatman, Ron; Nahm, James; Loeb, David M.; Porter, Dean

doi:10.2523/30512-ms

Cited by 2 publications

(1 citation statement)

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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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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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Mechanical Properties and Microstructure of Slag Solidified Body

Yang

Liu

et al. 2020

MSF

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The mechanical properties of slag solidified bodies tend to be degraded when the temperature of slag solidified bodies is high. It is easy to crack under the action of perforated fracturing to lose the effect of sealing and interlayer sealing, and affect the cementing quality. Therefore, the mechanical properties of the solidified slag at several bottom-hole cyclic temperatures (30 °C, 50 °C, 70 °C, 90 °C) were studied in the present investigation. The results showed that the early strength of the slag solidified body cured at 90 °C was stronger than the early strength of the slag solidified body at 30 °C and 50 °C but lower than 70 °C. However, when the curing time reaches 28 days, the compressive strength of the slag solidified body at 90 °C droped sharply lower than the strength of the slag solidified body at 30°C. SEM and XRD indicated that the hydration products of slag at 90 °C were primarily network-like C-S-H gels. Compared with low temperature conditions, slag solidified bodies at high temperatures (>90 °C) were prone to micro-cracks and the structure easily damaged.

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First High-Temperature Applications of Anti-Gas Migration Slag Cement and Settable Oil-Mud Removal Spacers in Deep South Texas Gas Wells

Cited by 2 publications

References 0 publications

Finite Element Simulation of Downhole Stresses in Deep Gas Wells Cements

Finite Element Simulation of Downhole Stresses in Deep Gas Wells Cements

Mechanical Properties and Microstructure of Slag Solidified Body

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