Formula No.6 Annular Velocity

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)

\dfrac{Pump\; Output\;(bbl/min)}{Annular\; Capacity\;(bbl/ft)}

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?




Correct/Incorrect
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Answer

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?




Correct/Incorrect
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Answer

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?




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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



Correct/Incorrect
Hint
Answer

3 thoughts on “Formula No.6 Annular Velocity

  1. tosnin says:

    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

    1. John Wayne says:

      295 ft/min

  2. Bruce Kelsch says:

    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?

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