Patent ID: 6279392
Filing Date: 2001-08-28
Classification: C09K,E21B

Abstract:
A distributed pressure monitoring system for simultaneously monitoring formation pressure across multiple zones intersected by a borehole into which a casing has been cemented, said monitoring system comprising:a multiple wire cable connected to surface facilities on one end and strapped in place along the casing leading down through the zones to be monitored;a plurality of pressure sensors spaced along the casing, each connected in communication with the cable, each sensor comprising:a pressure transducer;a diaphragm in the transducer;a conduit leading to the diaphragm;a pack of silicone grease in the conduit in communication with the diaphragm;a sensor housing enclosing each sensor and mounted to the casing;a plurality of open pressure tentacles, each attached to the sensor housing and in communication with one of the pressure sensors and comprising:a frit connected to conduit of the pressure sensor in contact with the pack of silicone grease;a permeable wire mesh hose closed on one end and connected to the pressure sensor upstream of the frit; anda gravel pack within the permeable wire mesh hose; anda plurality of fluid blockers molded onto the cable between the pressure sensors.