Banca de DEFESA: MYLLENA ROSANA DE ARAUJO MEDEIROS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : MYLLENA ROSANA DE ARAUJO MEDEIROS
DATE: 23/04/2026
TIME: 08:30
LOCAL: Auditório do IQ3
TITLE:

Experimental Study on the Effect of Chemical Additives in the Acidification of Carbonate Rocks: Emulsion Preventer and Corrosion Inhibitor.

KEY WORDS:

Acid stimulation; Reactive dissolution; Carbonate reservoirs; Chemical additives

PAGES: 120
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Físico-Química
SPECIALTY: Cinética Química e Catálise
SUMMARY:

The reduction in oil well productivity is often associated with the formation of damage that compromises the permeability of the porous medium. In carbonate reservoirs, matrix acidizing is one of the main remediation strategies, based on the heterogeneous reaction between hydrochloric acid (HCl) and carbonate minerals, promoting matrix dissolution and the formation of conductive channels known as wormholes. In operational practice, the formulation of the acid fluid includes additives such as corrosion inhibitors, used to protect equipment metallurgy against the high aggressiveness of HCl, and emulsion preventers, responsible for reducing the formation of stable emulsions between the acid and reservoir hydrocarbons. However, the incorporation of these compounds may also alter the physicochemical properties of the fluid, indirectly affecting reaction kinetics and mass transport mechanisms involved in carbonate matrix dissolution. This dissertation investigated the influence of a corrosion inhibitor (CI) and an emulsion preventer (EP), both individually and in combination (CA), on rock–fluid interactions during the injection of 15% HCl into Indiana Limestone carbonate samples with an average porosity of 18.40% and an average permeability of 123 mD. The additives promoted significant variations in surface tension, indicating changes in mass transport conditions and in the interfacial energy of the system. The results demonstrate that the incorporation of additives, in addition to fulfilling their primary functions of metallurgical protection and emulsion prevention, alters the kinetics of carbonate matrix consumption, as confirmed by reactor tests at 25 and 60 °C. Under reservoir conditions, EP, CI, and CA increased the dissolution time by 352%, 2957%, and 1720%, respectively. In flow-through porous media experiments, the minimum pore volume injected until breakthrough (PVbt) values were 0.30, 0.21, and 0.33 PV for the EP, CI, and CA solutions, respectively, demonstrating that fluid formulation directly impacts the efficiency of acid channeling. Microtomography analysis showed that the formation of dominant wormholes occurred at lower flow rates in acid solutions containing additives compared to those without additives. Operating at lower injection rates reduces the pressure differential imposed on the formation, decreasing the likelihood of undesired fracturing. The observed reaction retardation contributes to improved utilization of the acid agent, reducing the required consumption to reach breakthrough and favoring the formation of more efficient conductive channels under milder operational conditions. Thus, this study demonstrates that acid fluid formulation is a determining factor in reaction kinetics and in the balance between reaction and transport in porous media, with the adjustment of dissolution rate being a key element for optimizing matrix acidizing.

COMMITTEE MEMBERS:
Interno - 1753094 - ALCIDES DE OLIVEIRA WANDERLEY NETO
Externo ao Programa - 1752014 - EDNEY RAFAEL VIANA PINHEIRO GALVAO - nullExterno à Instituição - GUILHERME MENTGES ARRUDA - UFRN
Presidente - 1198847 - JOSE LUIS CARDOZO FONSECA
Externo à Instituição - MARCIO DA SILVEIRA CARVALHO - PUC - RJ
Externo ao Programa - 1754344 - MARCOS ALLYSON FELIPE RODRIGUES - null