Insufficient borehole pressure integrity (BHPI) is a major drilling challenge in deep high-pressure/high-temperature (HP/HT) wells. Shale and sandstone formations with low BHPI may be weakened by leaking faults/fractures or poor rock properties, resulting in lost returns. An innovative treatment increased leakoff test (LOT) and formation-integrity test (FIT) pressures. The full-length paper discusses this new treatment in detail and contains two case histories.