Why One Size doesn't Fit All: A Tailored Approach Toward Diversion Design Generates Incredible Results through Improved Zonal Coverage

Abstract The objective of this publication is to showcase the effectiveness of well stimulation using an innovative acid fracturing technique in water injectors, which offers long intervals and low temperatures in target zones. The scope includes the concept adopted for the acid fracturing design and, subsequently, the evaluation performed taking into consideration the effectiveness of various diversion techniques in comparison with the synergies explored in this particular approach. A tailored high-rate acid fracturing treatment system was devised with the use of hydrochloric acid, a viscous fluid, and a diverter. The system was then tested in alternating steps to ensure deep etched fracture length and diversion across the long interval may be achieved. Two different diverting techniques using coarse size granular salt and fiber laden self-diverting acid, were evaluated. Post-stimulation evaluation was carefully formulated and deployed using injectivity spinner to evaluate the effectiveness of each diverter. The results obtained from this evaluation were examined and recommendations were generated for subsequent treatments in similar conditions. A wide variation in diversion behavior was observed with both diversion systems, with one showing a lower pressure increment than other. The spinner survey was also aligned with the pressure trend. After the spinner survey evaluation, diversion design was further tuned, which enabled even more effective diversion in subsequent operations. The effectiveness of design modification also translated into greater gains in overall post-stimulation injection performance.