# Annular Volume With Pipe Calculator Standard

##### Annular Volume Calculation

With the word “Annulus” coming from the Latin language meaning “ring” this calculation can be used to find the section or that ring / wellbore in our case. This annular volume calculator above has the “With Pipe Section” added into it, that means we are simply removing a section of the area so that we can find the outside area which can be used for calculating bottoms up & other important calculations.

##### Lets Go Over An Example..

This is how you will usually find the formula written:

##### Annular With Pipe Calculation= (OH²-DP²) / 1029.4

This means you must work with BEDMAS, means start with brackets, exponents, division, multiplication, addition then subtraction in that order or it won’t work.

So lets say we have an open hole of 8 ¾” & a drill pipe **outer **diameter of 5″. The little ² is an exponent, that is just a fancy way of saying multiply the number it’s connected too by itself.

Well for starters if we multiplied 8 ¾ x 8 ¾ that is not correct as you need to make it in decimal form first. To do that you always take the fraction portion of the number which in this case is ¾. Divide 3 by 4 to get 0.75, now you are ready to continue.

8.75 x 8.75 – 5 x 5. Because they are in brackets you want to hit those ones up **before **continuing on to the division end of the formula.

**1)** 8.75 x 8.75= 76.5625 – 5 x 5= 25

**2)** 76.5625 – 25= 51.5625

**3)** 51.5625 / 1029.4= 0.050089bbl/ft

This is how much volume in barrels is present in 1 foot of space between 8 ¾” hole with 5″ drill pipe inside.

##### Want to know the length 1bbl occupies in this space?

Use this formula here, just flip it around..

##### Annular Distance With Pipe Calculation= 1029.4 / (OH²-DP²)

Still have to use BEDMAS, or it won’t work.

**1)** 8.75 x 8.75= 76.5625 – 5 x 5= 25

**2)** 76.5625 – 25= 51.5625

**3)** 1029.4 / 51.5625= 19.96ft/bbl

This is how many feet one barrel covers in between an 8 ¾” hole with 5″ drill pipe inside.

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