# Dimensionless pressure drop during pseudo-steady state flow for a horizontal well in a bounded reservoir

## Input(s)

\(t_{D A}\): Dimensionless Time (dimensionless)

\(C_{A h}\): Shape Factors for Horizontal Wells (dimensionless)

L: Length of Horizontal Well (ft)

A: Drainage Area (ft)

## Output(s)

\(P_{D}\): Wellbore Dimensionless Pressure Drop (dimensionless)

## Formula(s)

\[
P_{D}=2 * \pi * t_{D A}+0.5 * \ln \left(\frac{A}{4 *\left(\left(\frac{L}{2}\right)^{2}\right)}\right)+0.5 * \ln \left(\frac{2.2458}{C_{A h}}\right)+0.5 * 2.77
\]

## Reference(s)

Joshi, S. D. 1991, Horizontal Well Technology. Tulsa, Oklahoma: PennWell Publishing Company. Chapter: 7, Page: 216.