Oil-base Mud (OBM) and Backflow Encountering oil-base mud (OBM) and backflow can be a concern. Backflow usually happens when the well is not properly balanced, meaning the hydrostatic pressure of the mud column is not sufficient to keep formation fluids from flowing back into the wellbore. Causes of Backflow with Oil-Based Mud: 1. Insufficient Mud Weight: If the mud weight is too low, it may not exert enough hydrostatic pressure to counteract formation pressure. 2. Swabbing Effect: Running pipe
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