The complete paper focuses on identifying a hydrofluoric-acid (HF) -derivative treatment that could be used as a single-step sandstone acid treatment not requiring acid-flowback services. Five commercially available buffered, retarded, and HF-derivative acid chemistries were tested to determine the risks of facility upsets. A new fluoroboric acid (HBF4) chemistry was developed that has all the benefits of HBF4, is compatible with most sensitive minerals, and does not cause facility upsets.
Introduction
The wells in this study predominantly target production intervals that were initially bypassed or beyond the reach of the original field development plan. Only HF-treatment compositions can remove the predominantly siliceous components found in sandstone reservoirs.
