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What is under balance drilling?

Updated: 4/28/2022
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15y ago

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It is a drilling technique used to reduce the chip holding pressure when it be forced and make a difficulties to remove a part of rock by bit through rotary carbon steel teeth bit and by weight on bit , it used the UBD to make a secondary annulus by using another casing like tie back to divided the annulus to two part to relief the hydrostatic column drilling fluid pressuer and that will reduce the chip holding ppresseure and will be traet even the kicks without breaking the drilling operation to treat the kick off well

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Q: What is under balance drilling?
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