Publication Date: 2016-Jun-30
The IP.com Prior Art Database
Idea to take the comms-on-power system used to take data from a downhole ESP gauge and reverse the concept to allow the same method of data transmission to be used to send instructions from the surface to a downhole tool or actuator. However, if it can be made to work for this, there should be no reason why it could not be adapted to a wide range of potential applications both on the seabed or for in-well applications allowing the potential to eliminate at least one control line (more if possible to multiplex the signals) from a completion design. The concept is based on the commonly used method of transmitting data from a downhole ESP gauge by modulating a DC current to the HV (surface) panel over the same 3 phase power cable that powers the ESP motor. This modulated current is routed through the HV Interface Unit, which decodes the embedded serial information. In order to reverse the direction of comms to allow control, the Interface Unit would need to be marinized for a subsea application to allow a signal from the surface to be received and decoded at the seabed. Similarly for an in-well solution, the Interface Unit would need to be suitably configured to allow it to be deployed downhole. Looking just at the subsea version as the initial application to control the recirculation line choke, the instruction signal would need to be modulated at surface and the DC signal transmitted on the ESP cable to the subsea Interface Unit. This would then decode the info and use this to provide the signal to activate the choke to either open or close further. There are electrically actuated chokes available on the market and in the same way that the DC signal is used to provide a power supply to the ESP gauge, this could also be used to provide power to the electronics required to take the modulated signal and convert to a command signal for the choke and potentially use the same power to trickle charge the battery on the choke to allow it to function.