Cementing (Model Outputs)

Depth Channels

• Overbalance Pressure - The amount of pressure in the wellbore that exceeds the pressure of fluids in the formation. Calculated as

OBP=AP-PPhere:

AP - annulus pressure;

PP - reservoir pore pressure;

• Gas-flow potential factor - is the estimated amount of gas flow that can be expected from a formation. Calculated as

GFPF=MPR/OBPhere:

OBP - Overbalance Pressure

MPR - Theoretical maximum pressure restriction. Calculated as

MPR=SGS/300*L/Dhere:

SGS - Static gel strength, lb/100 sq f

L - Conversion factor (to obtain MPR in psi), lb/in

D - length of the cement column, ft

300 - = effective diameter of the cement column, in. (hole diameter minus pipe diameter)