Nomenclature

Frr = residual resistance factor h = height, ft [m] k = permeability, darcys [mm2] kgas = permeability to gas, darcys [mm2] ko = permeability to oil, darcys [mm2] kw= permeability to water, darcys [mm2] L = distance along a fracture, ft [m] Lgel = distance of gel penetration along a fracture, ft [m] Lf = fracture length, ft [m] Dp = pressure drop, psi [Pa] Dpgel = pressure drop during gel injection, psi [Pa] Dpwater = pressure drop during water injection, psi [Pa] dp/dl = pressure gradient, psi/ft [Pa/m] q = total injection or production rate, BPD [m3/d] re = external drainage radius, ft [m] rgel = radius of gel penetration, ft [m] rw = wellbore radius, ft [m] Sor = residual oil saturation t = time, days wf = fracture width, in. [m] m = viscosity, cp [mPa-s]