Stimulating naturally fractured carbonate reservoirs with high permeability contrasts is challenging. Achieving uniform stimulation coverage and fluid loss control requires effective, nondamaging diversion. Ineffective stimulations can amplify the permeability contrast, making subsequent stimulation treatments even more difficult. The self-diverting MaxCO3 Acid degradable diversion acid system has been shown to optimize treatment design, operational costs, and production while reducing total diverter and acid usage per net pay.
MaxCO3 Acid degradable diversion acid system helped remove reservoir damage and overcome contrasting permeability, delivering a sustained production of 254 m3/d, up from 32 m3/d. Read case study
The MaxCO3 Acid system, a viscoelastic surfactant in HCl blended with degradable fibers, provides temporary diversion and uniform acidizing treatments in a single step. The acid develops viscosity as it spends in the formation, while the fibers create an impermeable fiber network that blocks injectivity to thief zones and forces stimulation fluid into lower-permeability zones.
After treatment, the base fluid systems break on contact with hydrocarbons or solvents during flowback. The fibers completely degrade over time, producing a weak acid that continues to stimulate the well. This allows poststimulation production contribution from previously diverted areas and eliminates the risk of costly cleanout interventions.