Evaluation of Acid Treatment Results for Water-Injector Wells in Saudi Arabia

Abstract

TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractSeveral acid treatments were conducted in the Ghawar filed to increase the well injectivity and to support the reservoir pressure in this area. Vertical and horizontal wells with an open hole completion in a carbonate reservoir were selected to be a candidate for post acid treatments evaluation study.These wells were stimulated using hydrochloric and emulsified acid with foamed viscoelastic-based water. Viscoelastic-based water system was used to enhance the diversion mechanism and the lifting process for the spent acid following the treatment. In this paper new correlations for acid treatment design were obtained from an extensive study of several case histories that can be used for optimizing future acid treatments design in the Ghawar field. This study was mainly utilized the results from the post acid treatment jobs in terms of HCl acid, emulsified acid and viscoelastic volume correlated with the well's injectivity. Based on the study results, there is a strong relationship between the emulsified acid volumes with the injectivity index for the selected wells.

Nanoparticles as Depressurization and Augmented Injection Agents to Facilitate Low Permeability Reservoir Exploitation: Potentials and Risks

“…However, due to the nature of narrow throats, poor connectivity, high clay content, etc., low-permeability reservoirs usually exhibit high injection pressure and insufficient injection volume. Traditional depressurization and augmented injection technologies such as acidizing/fracturing (Wang et al, 1999;Al-Harbi et al, 2006), surfactant and membrane technology (Qu et al, 2012) are either with short validity or complicate process design, The advances in nanoscience offer a new insight to mitigate the problems confronted with water injection in low/ultra-low permeability reservoirs.…”