Patent ID: 8866631
Filing Date: 2014-10-21
Classification: E21B

Abstract:
1. A system for remote control of operation control elements that are arranged in a well to control recovery of gas and/or oil from the well, said remote control system comprising: a first system part located outside the well, the first system part comprising a constant current generator; a second system part located in the well and electrically connected to first system part, wherein the constant current generator of the first system part is controllable for feeding a stepwise variable current to the second system part, wherein all semiconductor components of the remote control system are housed in the first system part, and wherein the second system part houses at least one set of electromechanical relays operatively connected to the operation control elements, wherein the electromechanical relays are connected in series and are individually actuated in consecutive order in response to increasing or decreasing current supplied from the first system part to actuate the operation control elements upon command from the first system part; and an electric monitoring circuit that monitors a status of the at least one set of electromechanical relays contained in the second system part, wherein said monitoring circuit comprises a frequency sweep device arranged in the first system part, wherein a set of loads is connectable to the frequency sweep device with auxiliary contacts for each electromechanical relay, such that a set of current, voltage, and/or phase distortion values is recordable for a given load and/or value of frequency which is characteristic for each individual electromechanical relay.