Publications

The Proton field, characterized by varied reservoir qualities and lateral heterogeneity, has faced challenges due to facility constraints and high-water cuts from high-quality reservoirs. To enhance production from low-quality reservoirs (LQR), the asset optimization team has explored advanced technologies. Fracturing is one potential solution but is often costly and technically challenging for certain LQR types. Therefore, a simpler and more cost-effective stimulation method is necessary.

This study proposes a combined strategy of Acidizing and Cyclic Extended Breakdown (C-EBD) as an innovative approach to improve the productivity index of LQR. This method integrates chemical and mechanical efforts: the acid dissolves scale and matrix rock, while C-EBD generates shear fractures through a series of controlled cycles. The fluid injection stage is carefully managed to maintain pressure above the in-situ minimum horizontal stress and below the formation breakdown pressure.

Compatibility tests between acid and water production, as well as injection, were performed. A 15% HCl acid was injected, penetrating three feet near the wellbore. Following a soaking period, water was injected in five cycles of 120 bbls each. Notably, Step Rate Tests (SRT) during workover activities indicated improved injectivity, with pressure management during acidizing yielding significant results. The first C-EBD cycles achieved 0.8 bpm, while subsequent cycles reached 1.1 bpm.