This part of **well control formula **series (part#5) will show you following equations: mud increment for volumetric, lube increment for lubricate and bleed, bottle capacity required for koomey unit, volume of usable fluid, and snubbing force for snubbing operation. Later on, I will show you how to apply equations to particular situation. Anyway this is part 5 and total will be 8 parts.

**Mud Increment for Volumetric Method (MI), bbl**

**Lube Increment for Lubricate and Bleed Method (LI), bbl **

**Bottle Capacity Required, gal**

**Volume of Usable Fluid, gal**

**Snubbing force for snubbing operation**

**Snubbing Force (SF) = Force at wellhead (Fp) + Frictional Force – Buoyed weight of string (Wb)**

Basically, you can simply think like this. Total force to overcome pressure at wellbore is a summation of force at wellhead and frictional force minus buoyed weight of string.

Force at wellhead (Fp) can be determined by one of following equations.

OR

Note: you can read more detail about

force and pressure relationship and its application in the oilfield.

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

**Well Control Books**