During a workover operation while pulling out of tubing, the well was observed receiving fluid with no noticeable pit volume change, while paraffin was seen coming out in the returns.

What Was Happening
As the tubing was pulled, pressure fluctuations and swabbing effects allowed fluid to enter weak or depleted formations. At the same time, paraffin deposition inside the tubing and near-wellbore area restricted flow paths and affected circulation behavior.

Why Paraffin Is Critical During POOH
Paraffin buildup increases friction, limits effective circulation, and can mask early indicators of losses. Cold workover fluids further accelerate wax precipitation, increasing operational risk during tubing movement.

Mitigation Actions Taken
Pulling speed was controlled to minimize swabbing effects. Fluid level and hydrostatic pressure were maintained. Thermal and chemical paraffin treatments were applied to clean the tubing and wellbore, followed by wax inhibitor injection to prevent re-deposition.

Key Takeaway
Fluid losses during pulling out of tubing are not always caused solely by formation weakness. Paraffin deposition can play a major role and must be managed alongside pressure control to ensure safe and efficient workover operations.