Patent ID: 6993963
Filing Date: 2006-02-07
Classification: E21B

Abstract:
1. Method for determining pressure profiles in wellbores, flowlines and pipelines flowing singlephase or multiphase fluids, wherein the flow is temporarily closed or partly closed with a quick acting valve and the pressure is continuously recorded at a point a short distance upstream, using the Darcy-Weisbach equation: where f (dimensionless) is the friction factor, L (m) is the pipe length, d (m) is the pipe diameter, ρ (kg/m3) is the fluid density and u (m/s) is the fluid velocity, to determine the frictional pressure drop, while a distance-log of pressure change is obtained from a time-log and an estimate of the speed of sound in the actual fluid, while using the formula: where a is the speed of sound in the fluid, to obtain the relation between time (Δt) and distance (ΔL) and thereby obtaining the pressure profiles.