Real-Time Monitoring of Acid Stimulation Using a Fiber-Optic DTS System

This paper discusses a unique system that combines a fiberoptic distributed temperature system (DTS) to measure the distributed temperature across the entire wellbore and a molecular telemetry transmission system that provides a single-point determination of bottomhole pressure. The system has been used to perform real-time downhole monitoring of multi-stage acid-stimulation treatments performed on wells that contain multiple non-isolated pay intervals. The fiber-optic for the DTS is contained inside a length of capillary tubing, which is placed concentrically inside a larger size capillary tubing. The created annulus between these two strings of capillary comprises the molecular transmission system for determining the bottomhole pressure.