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• W2897358180 abstract "Abstract Well Cementing design is a critical component of Well engineering, as efficient cement design ensures the protection of the casing assemblies from fluid corrosion, and ensures the mechanical support of the well. It also ensures that hydraulic communication between different zones is prevented. Well abandonment is also critical as the design of the slurry required needs to be designed to efficiently keep hydrocarbons in the wellbore and prevent any immediate, short term or long term migration of hydrocarbons to surface. There are numerous studies and publications discussing the causes of gas migration after primary cement jobs and well abandonment, some of the causes of gas migration have been linked to poor fluid loss control, poor drilling fluid displacement (reduces seal efficiency at the interfaces), and long cement setting times which allows time for gas to percolate through the partially set cement slurry. This paper highlights the engineering methods, and how they can be used to properly evaluate the cement slurry design to ensure that gas flow through the cement lattice is completely prevented. It assumes that all other issues which involving poor execution (mud displacement, poor slurry mixing, use of low quality materials and chemicals, human errors), are annulled. The correlations/equations discussed and used for the evaluation of the abandoned case study well (Well XRT) are the Gas Flow Potential, Slurry Performance Number, Hydrostatic Number and Pressure Decay Limit Parameter. Results from critical evaluation with these equations confirmed that the Well XRT was efficiently abandoned. The paper further recommends that these equations should be used by Well Engineers be used to evaluate slurry designs for casing cementing and abandonment operations, as they will help ensure that the mechanical and hydraulic isolation is efficiently designed for and achieved." @default.
• W2897358180 created "2018-10-26" @default.
• W2897358180 creator A5050422004 @default.
• W2897358180 date "2018-08-06" @default.
• W2897358180 modified "2023-09-26" @default.
• W2897358180 title "Design and Evaluation of Cement Slurries to Prevent Gas Migration – Well XRT Abandonment a Case Study" @default.
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• W2897358180 doi "https://doi.org/10.2118/193490-ms" @default.
• W2897358180 hasPublicationYear "2018" @default.
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