Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Analysis of Stress Overshoot Fitting in Flow Start-up Tests for Different Drilling Fluids
Submission Author:
LUIS HUMBERTO QUITIAN ARDILA , PR , Brazil
Co-Authors:
LUIS HUMBERTO QUITIAN ARDILA, Elis Marina Schvan Wendt, Leonardo de Souza Santos, Diogo Elias da Vinha Andrade, Admilson Franco
Presenter: LUIS HUMBERTO QUITIAN ARDILA
doi://10.26678/ABCM.COBEM2023.COB2023-2410
Abstract
Drilling fluids play a crucial role in the oil and gas industry for the drilling process. One of their essential functions is to maintain the cutting's suspension during process stoppages. These fluids exhibit a gel-like behavior at rest and a liquid-like behavior during shearing. To flow start-up, higher than normal pressures are necessary to disrupt the gelled structure. Drilling fluids are categorized as non-colloidal suspensions in various matrices, such as oil or aqueous solutions containing suspended particles larger than 10 μm. These materials exhibit non-Newtonian rheological behavior, displaying properties such as yield stress and thixotropy. The impact of stress overshoot on different drilling fluids (bentonite suspension, Olefin based suspension with NaCl, water-based suspension with xanthan gum, and olefin-based suspension with a 60/40 oil/water ratio) was analyzed using rheometric data obtained from start-up flow tests. Anticipated outcomes suggest that aging time significantly impacts not only stress overshoot but also the shear strain required to disrupt the gelled structure of a material. Precisely, the prolonged aging time is predicted to decrease the strain necessary to break up the structure, indicating a negative correlation between aging time and stress overshoot. Furthermore, the fitted models demonstrate a high level of correlation with the experimental data, thus providing a reliable basis for utilizing these correlations in the planning and simulation of drilling operations in offshore fields.
Keywords
non-colloidal suspensions, Startup Flow, Drilling fluids, bentonite suspension, Olefin-based, water-based
