Patent ID: 6760275
Filing Date: 2004-07-06
Classification: E21B

Abstract:
A system for remotely controlling signal responsive devices at substantial depths in liquid media in bore hole installations below a well head installation comprising:at least one gas phase pressure impulse generator coupled to the well head installation to transmit gas impulses into the bore hole, the at least one impulse generator comprising a selectively variable volume chamber operable at selected pressure to release the pressure into the bore hole over a selected interval, the energy content of an impulse being greater than that within a 200 psi pressure differential existing over {fraction (1/50)} second; at least one detector in a remote bore hole location proximate a device to be controlled and responsive to physical perturbations in the medium propagated to that level through the medium; a control system for varying the chamber size, pressure level and interval length for successive different gas impulses to provide a command sequence defined by the impulses being transmitted; and logic means at the remote bore hole location for providing signals to control the signal responsive device, the logic means being coupled to the detector and responsive to the amplitude and duration of the detected physical variations in the medium.