Preventing “Stuck” and “Buried” Drilling Tools
- Gradual Advancement: Never apply excessive downward pressure too quickly. In layered formations or quicksand, aggressive cutting can cause borehole wall cave-ins or clog the bucket, burying the tool.
- Suction Effect Mitigation: When pulling the bucket out of cohesive clay, a negative pressure vacuum can form underneath it. Operators must lift the Kelly bar slowly at first to allow the bottom valves to open and equalize pressure.
- Load Monitoring: Watch the main winch tension and monitor the rig’s display panel constantly; stop immediately if the lifting force peaks abnormally.
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