MEDICAL DEVICE SYSTEM AND A METHOD FOR LOCATING MEDICAL DEVICES AND MOBILE CONTROL UNITS OF SAID MEDICAL DEVICE SYSTEM

摘要

A technique facilitates mechanical operation of components, e.g. valves, without utilizing electronics at the components or control lines routed to the components. An actuation control system is fully mechanical in the sense that it is constructed to mechanically shift to different control positions via pressure input, such as pressure input supplied along a wellbore annulus. The actuation control system utilizes a spool valve coupled with a pilot control circuit which establishes a reference pressure that can be used in shifting the spool valve to different operational positions.

主权项

1. A system for actuating devices in a well, comprising:
an actuation control system having:
a spool valve coupled to a well pressure line and a drain line on a first side of the spool valve and to a first actuation line and a second actuation line on a second side of the spool valve, the spool valve being shiftable to a plurality of operational positions based on pressures applied at a first port and a second port; anda reference pilot control circuit coupled with the first port to establish a reference pressure at the first port while the second port is exposed to well annulus pressure, the reference pilot control circuit comprising a gas reservoir and a pair of opposed relief valves which enable the reference pressure to be established in the gas reservoir at a level higher than an input well annulus pressure.