Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
RHEOLOGICAL MODIFIERS IN DRILLING FLUIDS
Submission Author:
Roberta Kamei Rodrigues , RJ , Brazil
Co-Authors:
Roberta Kamei Rodrigues, Monica Naccache, Paulo Roberto de Souza Mendes
Presenter: Monica Naccache
doi://10.26678/ABCM.ENCIT2018.CIT18-0153
Abstract
The loss circulation, that is, the uncontrolled flow of whole mud into a formation, sometimes referred to as a “thief zone”, can happen when the drilling of an oil well is made in a formation which contains fractures (natural or provoked) with high permoporosity (unconsolidated formation, presence of faults and fractures). The loss of circulation can cause well instability, since the decrease of the level of fluid in the annulus can cause the reduction of the hydrostatic pressure, and consequently the collapse of layers of the formation or the undesired influx of fluids from the formation into the well. The main goal of the present work is the study of additives that can modify rheologically the aqueous drilling fluid, in order to increase its elasticity. A fluid with high elasticity can deform reversibly, i.e. a drilling fluid having high elasticity can deform when it reaches a region of the formation with high permoporosity, but without invading it. The experiments were conducted with two polymers and one mineral commonly used in the oil industry. The tests performed involved extensional rheology.
Keywords
loss circulation, drilling fluid, extensional rheology
