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• W2012852093 abstract "Abstract Brazilian oil and gas reserves are primarily located in offshore fields, in deep and ultradeep water depths, where well construction is specially complex. Continuous development of drilling technology leads to the increasing application of synthetic-based drilling fluids, which have adequate characteristics such as lubricity, shale inhibition and low toxicity. In offshore conditions a gas kick is of major concern, as formation gas will dissolve in the organic compound of the synthetic-based drilling fluid. The better understanding of gas solubility is very important in operational and environmental safety of well control procedures, to avoid a blowout situation. In the present work methane was chosen because it is the principal component of natural gas, while ester was used in the formulation of drilling fluids. Knowledge of phase equilibrium of these mixtures, at high pressures and high temperatures, demands experimental tests, which are specific, expensive and time consuming. This work presents experimental data, obtained from PVT analysis of methane and ester-based emulsion mixtures. Laboratory tests were performed with last generation equipment, where a complete visualization of the sample fluid was possible. The mixture was loaded into a PVT cell and the equilibrium was reached at the pressure and temperature conditions expected at bottomhole. At constant temperature, the volume in the cell was monitored as a function of the pressure. An original gas enrichment experimental procedure was devised in order to cover the temperature, pressure and methane concentration range with a long term, single liquid amount test. Measured data enabled the estimation of the bubble pressure, solubility, density and formation volume factor of the mixtures, developing new correlations for pressures up to 15,000 psi and temperatures up to 266 °F. A thermodynamic modeling based on Peng-Robinson equation of state was applied to predict the experimental bubble point. The present work enlarges the limited thermodynamic properties database about methane – ester systems that is available in the literature and furnish scientific answers to the well control problems encountered when drilling with ester based emulsions." @default.
• W2012852093 created "2016-06-24" @default.
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• W2012852093 date "2010-09-19" @default.
• W2012852093 modified "2023-10-18" @default.
• W2012852093 title "Study of the PVT Behavior of Methane and Ester-Based Drilling Fluid Mixtures" @default.
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• W2012852093 doi "https://doi.org/10.2118/141130-stu" @default.
• W2012852093 hasPublicationYear "2010" @default.
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