# Annular Volume With Pipe Calculator Metric

##### 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) / 1273000

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 311mm & a drill pipe **outer **diameter of 127mm. The little ² is an exponent, that is just a fancy way of saying multiply the number it’s connected too by itself.

311 x 311 – 127 x 127. Because they are in brackets you want to hit those ones up **before **continuing on to the division end of the formula.

**1)** 311 x 311= 96,721 – 127 x 127= 16,129

**2)** 96,721 – 16,129= 80,592

**3)** 80,592 / 1273000= 0.0633m³/meter

This is how much volume in cubes is present in 1 meter of space between 311mm hole with 127mm drill pipe inside.

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

Use this formula here, just flip it around..

##### Annular Distance With Pipe Calculation= 1273000 / (OH²-DP²)

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

**1)** 311 x 311= 96,721 – 127 x 127= 16,129

**2)** 96,721 – 16,129= 80,592

**3)** 1029.4 / 80,592= 15.79m/m³

This is how many meters one cube covers in between an 311mm hole with 127mm drill pipe inside.

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