Banca de QUALIFICAÇÃO: AERYSLANNIA MOREIRA DA NOBREGA

ANALYSIS OF THE INFLUENCE OF WATER-BASED DRILLING FLUID ON DAMAGE TO FORMATION IN CARBONATIC ROCKS

Water-based drilling fluid, Formation damage, Carbonate rocks, Weighting agents, Overbalance, Salinity.

Drilling fluid or drilling mud is a liquid- or gas-based fluid used to facilitate drilling by cooling and lubricating the drill bit, aiding in the transport and removal of cuttings, and preventing fluid invasion into the formation by creating a filter cake, as well as contributing to the stabilization of the wellbore walls. The properties of the mud must be adjusted to act efficiently based on the characteristics present in each formation interval, causing minimal damage to it. Formation damage is a term used to refer to the impairment of the permeability of petroleum-bearing formations due to adverse processes that can occur during the various phases of a reservoir's lifecycle. The objective of this project is to evaluate how the operational parameters of water-based drilling fluids, specifically fluid weight (concentration of weighting agent), overbalance pressure, and salinity of the drilling fluid, affect the occurrence of formation damage in carbonate rocks. For this purpose, pertinent physicochemical characterizations of the drilling fluids will be carried out, petrophysical characterizations of carbonate rock samples, permeability return tests in porous media flow (injection of the formulations into rock samples), and computed microtomography of the tested rocks. This way, the project aims to achieve a better understanding of the influence of fluid parameters on the incidence of formation damage.