Effect of Chemical Additive at High Temperature up to 260?C of an Indonesia Bentonite

Abstract

With the goal of increasing understanding of drilling fluid characterization into environments at high temperature until 260 C during geothermal well drilling operations was carried out. High-temperature drilling fluid that are most commonly used in the Indonesian geothermal well drilling industry were selected and evaluated. Eight chemical additives in water-based drilling fluids system were formulated and chemically characterized in order to carry out the rheological evaluation. Dynamic experimental tests considering the non-Newtonian behavior of high-temperature drilling fluid were performed using a coaxial viscometer (Fann 50C). Drilling fluid viscosities and filtration in a programmed temperature range of 25 - 260 C (at constant reservoir pressure and a shear rate of 3448.2 kPa and 170 s-1) were measured. Details of the experimental rheological tests including a complete description of the equipment and all the High-temperature drilling fluid used are presented. Furthermore, compensatory materials used to counteract adverse reaction of the thermal decay of various materials, along which new product which enhanced fluid thermal stability are recommended.