Monitoring Systeme fur Untertage Komplettierungen von Kavernenspeichern -Funktionsprinzipien und Erfahrungen zum Feldeinsatz Monitoring Systems for the Underground Completion of Storage Caverns - Functional Principles and the Field Experience

摘要

One reason to develop a monitoring system for casing- and tubing strings was caused by seve- ral damages of production strings on different locations.One reason for these damages was the exceeding of the critical axial load capacity in consequence of operation states and convergence (salt movement).To avoid damages on casing and tubing strings,it is recommended to monitor the occurring loads while in operation.There are three independent systems for measuring and monitoring the axial loads of the completion.1.Strain-gauges to monitor axial loads,di- rectly mounted on the surface casing and an additional on the production string.2.The Tension Monitoring System (TMS) which is connected to the well head and deviates the axial loads to load cells which are mounted on a base frame in the cellar.3.The Tension Control and Monitoring System (TCMS),to be implemented by measuring the hydraulic pressure in a Hollow-Piston Cylinder,which is directly integrated in the wellhead.