- Drill string Capacity or Casing capacity calculation or pipe capacity
- Pipe displacement calculation
- Annular volume calculation

- Volume of drilling mud in hole
- Volume of drilling mud required to displace the cement into the annulus
- To calculate gain or loss
- To calculate the height of influx if its volume is know
- To calculate Lag time(it is the time required by the cuttings after they are drilled to reach the surface)

__- includes calculating the inside volume of drill string or Casing__

**Drill string Capacity or Casing capacity calculation**Pipe Volume(bbl) = ID

where ID = internal diameter in inches, L= length in feet^{2}*L/1029.4Note:- Pipes with different internal diameter will have different pipe capacity and should be calculated separately.

**:- It is the metal volume of pipe.**

__Pipe displacement__Pipe displacement(bbl) = (OD

where OD = outter diameter in inches^{2}-ID^{2})*L/1029.4Example:-

__Pipe Capacity:-__Drill pipe Volume = ID

^{2}*L/1029.4

=2.67

^{2}*1000/1029.4

=7 bbl

Drill Collar Volume= 2.25

^{2}*200/1029.4

= 1 bbl

Total pipe volume =Drill pipe +Drill collar volume

= 7+1

=8 bbl

__Pipe Displacement__

**:-**Drill pipe Displacement = (OD

^{2}-ID

^{2})*L/1029.4

= (3.5

^{2}-2.67

^{2})*1000/1029.4

= 5 bbl

Drill Collar Displacement= (5

^{2}-2.25

^{2})*200/1029.4

= 4 bbl

Total pipe Displacement =Drill pipe displacement+Drill collar displacement

=5+4

=9 bbl

Sir, say something about mud losses calculation........

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Excellent!!!

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