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• W4214522918 abstract "Abstract Pressurized Mud Cap Drilling (PMCD) requires use of an annulus fluid that is slightly underbalanced to the reservoir; the use of foam is proposed for low bottomhole pressure applications. Such an application requires a foam hydraulics model to guide the planning and operations as pressure management is key for PMCD. This paper presents the development of a novel 1-D steady state wellbore scale foam hydraulics tool and its application to a PMCD operation. User inputs include non-Newtonian rheology, PVT, solubility, temperature profile, pipe RPM, and reservoir pressure. The primary operational parameters are the gas/liquid rates at the surface. The density and pressure profile of foam in the wellbore is calculated to guide the formulation development and determine optimum operational parameters. The challenge is to develop a foam that can at the same time balance reservoir pressure (density design), be pumped at the desired downhole rates (for influx management) at permissible surface pressures (viscosity design), and is stable under wellbore pressures and temperatures (formulation design). These opposing requirements make the design an iterative process. Sample hydraulics results are presented for an example well and a sensitivity analysis is performed to demonstrate the effect that various operational and well parameters have on the hydraulics of a foam system. Both the pumps-on and pumps-off scenarios are studied. Additionally, a CFD analysis is performed to study the effect of drill pipe rotation in an eccentric annulus on friction pressure drop. A non-monotonic trend is observed due to the competing effects between the shear-thinning behavior (reduces viscosity) and turbulence (increases effective viscosity). The hydraulic model is verified by comparing against analytical solutions, an industry standard drilling software, experimental data, and CFD simulations. The paper demonstrates the importance of a foam hydraulics tool for a PMCD application and how it factors into the overall design of a foam system. It is shown to be a critical part of the foam formulation development, selection of density, rheology, gas/liquid ratio, and target pump rates and expected pressures." @default.
• W4214522918 created "2022-03-02" @default.
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• W4214522918 date "2022-03-01" @default.
• W4214522918 modified "2023-09-27" @default.
• W4214522918 title "Enabling Foam Application in PMCD Using a Hydraulics Model" @default.
• W4214522918 doi "https://doi.org/10.2118/208730-ms" @default.
• W4214522918 hasPublicationYear "2022" @default.
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