Patent ID: 7240537
Filing Date: 2007-07-10
Classification: E21B,G01N

Abstract:
1. Method for the determination of the friction pressure drops along any pipe transporting liquids, the discharge pressure of said pipe being higher than the bubble pressure of the transported liquids, comprising: (a) a first Stage of measure in time of the pressure transients generated by flow rate changes; (b) a second Stage of processing of pressure data acquired in Stage (a), thus obtaining the evolution of the flow rate in the pipe during the transient; (c) a third Stage of processing of the pressure data acquired in Stage (a) in which, making use of the evolution of flow rate determined in Stage (b), the diameter or roughness profile along the pipe is derived; (d) a fourth Stage in which the diameter or roughness profile obtained in Stage (c) is used to compute the wall friction profile along the pipe at any given steady flow rate.