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- W1983398082 abstract "Abstract Due to their complex formulations, Drilling Fluids and especially Oil base Muds exhibit very complex rheological properties. They are commonly described as thixotropic shear thinning fluids with a yield stress. A set of standards established by the American Petroleum Institute is available for the rheological characterization of these fluids and classical descriptions with non-Newtonian fluids such as yield power law models are typically employed. Although these descriptions and measurements are adequate for classical drilling situations, they reveal to be insufficient to describe more complex phenomena as barite sag, or pressure peak due to transient gel breaking on restart. In particular ultra low shear rate rheology has been early accepted as a key parameter for determining sag potential, and is poorly described by the classical models and measurements. On the other hand, time-dependent behavior (classically apprehended in static conditions through Gel 0 and Gel 10 measurements), which can be very significant even in dynamic conditions, is not quantitatively linked to the rheological description. This paper describes how a simple thixotropic and structural model is able to describe completely all the features of the rheological behavior of drilling muds. The parameters of the model can be simply deduced from on site measurement using Fann 35 rheometer. We show that mud viscosity results at any moment from the competition between aging and shear rejuvenation. As a consequence, viscosity bifurcation (abrupt transition towards complete stoppage or rapid shear) may appear at low shear, which might explain the occurrence of barite sag. Finally, it is shown how any transient phenomena like pressure peaks when starting a pump after circulation stoppage may be adequately predicted by using this model in hydraulic calculation." @default.
- W1983398082 created "2016-06-24" @default.
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- W1983398082 date "2006-02-21" @default.
- W1983398082 modified "2023-09-26" @default.
- W1983398082 title "How To Unify Low-Shear-Rate Rheology and Gel Properties of Drilling Muds: A Transient Rheological and Structural Model for Complex Well Applications" @default.
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- W1983398082 doi "https://doi.org/10.2118/99080-ms" @default.
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