REACTIVE FORMATIONS Northeast of Brazil: CHARACTERIZATION AND CAPACITY EXPANSION ANALISYS

Reference	Presenter	Authors (Institution)	Abstract
16-063	DANIELLY VIEIRA LUCENA	LUCENA, D.V.(Instituto Federal da Paraíba); da Rocha, C.O.(IFPB); Barbosa, M.d.(Instituto Federal da Paraíba); SOUTO, C.R.(UFCG); SEVERO, I.P.(IFPB); Barros, F.D.(IFPB);	The problem of wellbore stability in expansive formations has frustrated engineers of oil fields since the start of oil and gas well perforation. Instability is the factor that causes the most significant technical problem in the drilling operation and it is also a major source of lost time and high cost. Argillaceous formations such as shales containing smectite are sensitive to the presence of water and the greater the amount of smectite, higher reactivity in the presence of water. This phenomenon is known as expansion or swelling. So, the aim of this paper is to characterize the shales from two different regions of the country and to explain the susceptibility of hydration of each of these formations. The characterization was done by making use of CEC, DTA and XRD. The obtained results showed that among the studied shales, those with the greatest degree of clay fractions (smectite) in its composition showed higher expansion index according of swelling test.
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