Pore-pressure gradient - Rehm and McClendon

Input(s)

$d_{c n}$: Normal dc (Modified Bit-Weight exponent in Bingham equation) exponent (dimensionless)

$d_{c o}$: Observed dc (Modified Bit-Weight exponent in Bingham equation) exponent (dimensionless)

Output(s)

$g_{p}$: Pore Pressure Gradient $(\mathrm{psi} / \mathrm{ft})$

Formula(s)

$$ g_{p}=\left(0.398 \log \left(d_{c n}-d_{c o}\right)\right)+0.86 $$

Reference(s)

Watson, D., Brittenham, T., \& Moore, P. L. (2003). Advanced Well Control (Vol. 10). Society of Petroleum Engineers, Page: 52.