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Gauge Friendly Solid State Decoupler for Cathodic Protection System

IP.com Disclosure Number: IPCOM000247515D
Publication Date: 2016-Sep-13
Document File: 1 page(s) / 5K

Publishing Venue

The IP.com Prior Art Database

Abstract

What is proposed is to add a DC resistance in parallel with a Solid State Decoupler that is low enough to allow the down-hole gauge to operate but high enough to prevent interference with a cathodic protection system.

Typical Cathodic Protection Systems used in the oilfield apply a DC current that flows between the wellhead metalwork GND and earth ground. For this to be effective, a commercially available Solid State Decoupler (SSD) is used to connect between the wellhead GND and the surface electrical equipment GND. The SSD provides an AC connection between the two GND systems for safety but maintains DC isolation needed for proper operation of the cathodic protection system. However this DC isolation of the SSD prevents the operation of down-hole comms-on gauges commonly used with Electrical Submersible Pump (ESP) systems and has prevented well owners from utilizing comms-on gauge systems. The proposed solution is to add a DC resistance in parallel with the SSD that is low enough to allow the down-hole gauge to operate but high enough to prevent interference with the cathodic protection system. The actual value of resistance needed may vary due to differences in cathodic protection systems DC current levels but for the comms-on gauge to operate the resistance should be less than 500 ohms.

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Gauge Friendly Solid State Decoupler for Cathodic Protection System

What is proposed is to add a DC resistance in parallel with a Solid State Decoupler that is low enough to allow the down-hole gauge to operate but high enough to prevent interference with a cathodic protection system.

Typical Cathodic Protection Systems used in the oilfield apply a DC current that flows between the wellhead metalwork GND and earth ground. For this to be effective, a commercially available Solid State Decoupler (SSD) is used to connect between the wellhead GND and

the surface electrical equipment GND. The SSD provides an AC connection between the two GND systems for safety but maintains DC isolation needed for proper operation of the cathodic protection system. However this DC isolation of the SSD prevents the operation of

down-hole comms-on gauges commonly used with Electrical Submersible Pump (ESP) systems and has prevented well owners from utilizing comms-on gauge systems. The proposed solution is to add a DC resistance in parallel with the SSD that is low enough to allow the down-hole gauge to operate but high enough to prevent interference with the cathodic protection system. The actual value of resistance needed may vary due to differences in cathodic protection systems DC current levels but for the comms-on gauge to operate the resistance should be less than 500 ohms.