oa Innovative Electromagnetic Surface-Controlled Subsurface Safety Valve for Immediate Securing of Well with a Damaged Control-line

A common cause of failure with surface-controlled, subsurface safety valves (SC-SSSV) is a defect in the down-hole<br>hydraulic line, which controls the valve from the surface. Such a failure generates production losses and requires the<br>intervention of a costly workover rig - usually not immediately available. In order to alleviate this type of situation, a<br>"fail-safe" safety system based on electromagnetic waves (EM) was developed in order to communicate with<br>Downhole Safety Valves (DHSV) without the need for a physical control-line. The surface emitter continuously sends a<br>signal (low frequency) to the SC-SSSV downhole. Both items are designed to be fail-safe. The normally-closed valve<br>remains open while receiving the signal and closes as soon as the signal is lost.