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Showing 1 to 7 of 7 for “"cement sheath"”.
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Real-time monitoring of cement sheath integrity under high-angle HPHT wellbore conditions.
The lengthy time span over which the cemented well needs to retain its integrity is a massive challenge today. The cement plugs in abandoned wells, in conjunction with the annular cement sheath, need to prevent leakages well beyond the life of the wellbore. The results of a recent engineering study …
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Characterizing the Behavior of Smart Oil Well Cement for Enhancing the Monitoring of Cement Sheath Integrity
Oil well cementing is one of the most important and yet complex steps of a drilling project. One of the challenges in maintaining the well integrity is in monitoring the performance of oil well cement (OWC) used in the construction of the well. Recent oil well failures have clearly identified the …
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Emergence of Delamination Fractures around Casing and Its Stability
The cement sheath failures and nearby wellbore failures may lead to upward flow of drilling fluid or formation fluid, which may have significantly adverse consequences like loss of reserve and environmental hazards. In order to maintain wellbore integrity in the long term, it is expedient to …
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Chemo-poro-elastic fracture mechanics of wellbore cement liners : the role of eigenstress and pore pressure on the risk of fracture
… that were caused primarily by casing and cementing problems. Considering the detrimental consequences even a single failed well can have on the health of vast expanses of ecosystems, the quality of groundwater aquifers, and the production efficiency of fossil resources, ensuring the …
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Wellbore Microannulus Characterization and Seal Repair: Computational and Lab Scale Modeling
… to characterize the microannulus region of the cement sheath-steel casing interface in terms of its compressibility and permeability, as well as understand the mechanical behavior of a flaw upon repairing it with an epoxy nanocomposite material. Numerical models are used to analyze stress and …
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Analysis of diagnostic testing of sustained casing pressure in wells
… Then, the gas migrates upward through a leaking cement sheath, percolates through the mud column and accumulates above the liquid level inside the gas cap. The study identified two scenarios of gas flow in the liquid column: rapid percolation through low-viscosity Newtonian fluid; and, slow …
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Reactive MgO and Self-healing Microcapsules for Enhanced Well Cement Performance
The annular cement sheath plays a crucial role in ensuring well integrity by providing adequate zonal isolation, stabilizing the formation, and protecting the casing from corrosion. A majority of well integrity problems originate from oil well cement shrinkage and shrinkage-induced cracking, as …