This formula is used to calculate Annular Velocity if pump output and annular capacity are given or can be derived.

By this formula Annular Velocity is Pump Output divided by the Annular Capacity.

6. |
ANNULAR VELOCITY (ft/min) |

Problems on Annular Velocity:

Q1. What is the annular velocity around drill collars if the pump output is ___ bbl/min and the annular capacity around drill collars in open hole is ___ bbl/ft?

Q2. Minimum annular velocity required for proper lifting of cuttings is ___ ft/min. What should be the minimum pump output/discharge if the annular capacity is ___ bbl/ft?

Q3. The rig mud pump has a displacement of ___ bbl/stroke and total pump rate is ___ SPM. What will be the annular velocity around BHA if the annular capacity is ___ bbl/ft?

Q4. Find Annular Velocity of mud around drill pipes in casing.

Casing Capacity | ___ bbl/ft | Pump Displacement | ___ bbl/stroke |

Drill Pipe Capacity | ___ bbl/ft | Pump Rate | ___ SPM |

Drill pipe metal displacement | ___ bbl/ft |

Find Annular Velocity of mud around drill pipes in casing.

Casing Capacity 0.039 bbl/ft Pump Displacement 0.115 bbl/stroke

Drill Pipe Capacity 0.00658 bbl/ft Pump Rate 100 SPM

Drill pipe metal displacement 0.00587 bbl/ft

295 ft/min

While RIH with wireline at 150’/minute. What is the barrels per minute rate going around a 3.65 OD composite bridge plug in 4″ ID casing? Can you send me the equation?