I update some useful drilling formulas into the drilling formulas spread sheet called version 1.1.

**Please feel free to download.**

## Drilling Formula Calculation Sheet V1.1

**The following drilling formulas are added:**

**Hydrostatic Pressure Loss Due to Gas Cut Mud**

**Maximum pit gain from gas kick in water based mud**

**Maximum Surface Pressure from Gas Influx in Water Based Mud**

You can read how to use this work sheet via this topic > Drilling Formula Calculation Sheet

**Ref book: ** **Formulas and Calculations for Drilling, Production and Workover, Second Edition**

Vry nyc web site…

hello dear sir

thanks for your all guidlines.how we can calculate back reaming rate.

I don’t have the formula to determine back ream rate. It depends on experience in that area, condition of the well, etc to identify how fast you will back ream.