Well Control Formulas Part 5

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: Drilling Formula Book Formulas and Calculations for Drilling, Production and Workover, Second Edition
Well Control Books

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