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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
EFFECTS OF THERMAL AGING ON THE RHEOLOGY OF WATER-BASED DRILLING FLUID WITH XANTHAN GUM AND LIMESTONE
Submission Author:
LUIS HUMBERTO QUITIAN ARDILA , PR , Brazil
Co-Authors:
LUIS HUMBERTO QUITIAN ARDILA, Jonathan Galdino, Admilson Franco
Presenter: LUIS HUMBERTO QUITIAN ARDILA
doi://10.26678/ABCM.ENCIT2020.CIT20-0220
Abstract
Drilling fluids must have the ability to transport cuttings during well drilling operations. Thermal gradients during the drilling process degrade the fluid, altering its rheological properties. The effect of thermal aging is significant in calculations of hydraulic projects under HPHT conditions. In the present work, flow curves were performed on the Anton Paar MCR 702TD rheometer to investigate the influence of temperature in a range of 4 to 70 ºC on water-based drilling fluids with Xanthan gum. The viscosity variation was fitted to the WLF model through the consistency coefficient, showing a decrease with temperature. Also, dynamic thermal aging tests were carried out at 90 and 125 ºC. Its comparison is made employing flow curves, evidencing a decrease in shear stress and the decrease in transition temperature with an increase in the aging temperature. Likewise, qualitative experimental tests showed a greater solubility of the electrolytes, an increase in the pH, and reduction in phase separation time, evidencing the thermal structural degradation of the fluid. The results evidenced physical-chemical alterations in the components of the drilling fluid. Experimental fit can be used successfully in the oil \& gas industry to aid in the decision-making process.
Keywords
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