Abstract
This study evaluates the performance of a synthetic green-acid system (Oil Safe AR®) as an environmentally friendly alternative to hydrochloric acid (HCl) for matrix acidizing in carbonate formations. A comprehensive experimental program was performed, including single-core and dual-core coreflooding tests conducted under low-temperature (40 °C) and high-temperature (82 °C) conditions, followed by analysis of multi-well field treatments. In laboratory tests, the green acid (Oil Safe AR®) consistently demonstrated moderated reaction kinetics that promoted deeper acid penetration and more uniform wormhole development compared with conventional 15 wt% HCl. Dual-core experiments showed that green acid (Oil Safe AR®) achieved stable and sustained diversion at both low and high temperatures when injected above a critical flow rate, whereas HCl produced only transient diversion dominated by rapid face dissolution. Core-scale results were in strong agreement with field treatments, where the green-acid system (Oil Safe AR®) delivered significant and persistent improvements in production and injectivity. Overall, the findings demonstrate that green acid (Oil Safe AR®) provides a safer and more controlled stimulation option, especially in carbonate reservoirs where conventional HCl tends to react too aggressively and unpredictably.
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