Drainage Area

Work in progress.

=Drainage Area= A term required as a boundary condition for a mathmatical description of a flow regime as defined by Darcy's Law radial solution. Should I put something here about volumetric drainage area?

Flow Regimes
Darcy described flow through porous media in its simplest for as a function of pressure gradient, permeability, and viscosity. For radial flow, the term Re is defined as the reservoir boundary. Under transient flow, no reservoir boundary is defined, because the well has not yet seen the reservoir boundary; therefore, time is required as an input. Once the well has seen the reservoir boundary (or another well) a boundary condition is defined as either constant pressure (steady-state) or constant pressure decline, dp/dt=constant (pseudo-steady-state).

add Pressure vs Radius (with time) plot
 * add general Darcy's Law and Darcy Gas Radial Flow Equation

Drainage area versus well spacing
Drainage area is simply a mathematical term required as a boundary condition for a mathmatical description of a flow regime. Well spacing is a choice on field development.