Banca de QUALIFICAÇÃO: MARIA CAROLINA NEVES SILVA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : MARIA CAROLINA NEVES SILVA
DATE: 23/01/2026
TIME: 14:30
LOCAL: Sala de reunião da engenharia de petróleo
TITLE:

Experimental investigation of the acidification of carbonate rocks under different temperature conditions.

KEY WORDS:

Carbonate rock acidification; Wormholes; Temperature; Acid stimulation; Surfactants.

PAGES: 108
BIG AREA: Engenharias
AREA: Engenharia Química
SUBÁREA: Tecnologia Química
SPECIALTY: Petróleo e Petroquímica
SUMMARY:

The growing global demand for energy has driven the search for more efficient techniques in oil production, especially in the face of the economic and operational challenges of exploring new fields. Among the strategies adopted to maximize hydrocarbon recovery in existing reservoirs, the acidification of carbonate rocks with hydrochloric acid (HCl) stands out as a widely used method to increase formation permeability and stimulate well productivity. This process occurs through the selective dissolution of the rock, forming flow channels called wormholes, which significantly improve reservoir conductivity. However, the efficiency of acidification depends on a number of factors, including temperature, which directly influences the reactivity of the acid, the rate of rock dissolution, and the stability of the channels formed. Given this context, this study aims to investigate the effect of temperature on the acidification process of carbonate rocks using HCl combined with surfactant additives through laboratory tests encompassing the physicochemical characterization of the acid fluid, analysis of rock properties, bench tests, reactive flow tests, computed microtomography, and economic analysis. The results showed that temperature significantly increased the acid-carbonate reactivity, raising the dissolution rate by up to 114% between 30 °C and 80 °C. In emulsion stability tests (ESI), heating favored phase destabilization. In static corrosion tests, the additivated acid solutions showed efficiency greater than 85% for all temperatures studied. Reactive flow tests indicated that the optimal PVbt values were observed at the same flow rate of 4.0 mL/min for the three temperatures evaluated, with optimal values of 0.27 at 40 °C, 0.25 at 60 °C, and 0.33 at 80 °C, demonstrating that the optimal PVbt does not respond monotonically to temperature due to the interfacial control of the surfactants, which favored a more homogeneous distribution of the acid and greater stability of the wormholes even at high temperatures. The study concluded that it is possible to achieve a balance between dissolution efficiency, thermal stability of the additives, and mitigation of corrosivity, contributing to the development of safer and more efficient stimulation fluids for carbonate systems.

COMMITTEE MEMBERS:
Presidente - 1753094 - ALCIDES DE OLIVEIRA WANDERLEY NETO
Externo ao Programa - 1752014 - EDNEY RAFAEL VIANA PINHEIRO GALVAO - UFRNExterno ao Programa - 1754344 - MARCOS ALLYSON FELIPE RODRIGUES - UFRNExterno à Instituição - DENNYS CORREIA DA SILVA - UFMA