Organic salt brines represent a good alternative to drill through deep productive zones. The literature presents these salts as thermal stabilizers of polymers used in the formulation of drill-in fluids. An extensive study was carried out to evaluate the rheological behavior of formate-based fluids as a function of temperature and density. An analytical expression was developed to correlate shear stresses with temperature for general drilling fluids and a special case of this expression results in a greatly simplified expression that is valid for a number of drilling and completion fluids produced using different alkali-metal salts of formic acid. The advantage of this new approach is the lack of dependence between the proposed correlation and the choice of a rheological model. Unlike many expressions presented in the literature, the expression proposed and methodology that follows allows the choice of a best-fit model to predict the fluid’s rheological behavior as a function of temperature. Experimental results show that formates do improve the thermal stability of polymers. The proposed correlations will soon be incorporated in a wellbore cleaning numerical simulator to compensate for thermal effects.
A New Approach to Evaluate Temperature Effects on Rheological Behavior of Formate-Based Fluids
Contributed by the Petroleum Division and presented at the ETCE/OMAE2000, New Orleans, Louisiana, February 14–17, 2000, of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS. Manuscript received by the Petroleum Division, June 15, 2000; revised manuscript received February 25, 2002. Editor: A. K. Wojtanowicz.
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Lomba, R. F. T., de Sa´, C. H. M., and Branda˜o, E. M. (August 6, 2002). "A New Approach to Evaluate Temperature Effects on Rheological Behavior of Formate-Based Fluids ." ASME. J. Energy Resour. Technol. September 2002; 124(3): 141–145. https://doi.org/10.1115/1.1485293
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