Back to top

FWC Flowing Well Controller

Flowing Well Controller (FWC)Flowing Well Controller (FWC)

The FWC Flowing Well Controller is designed to regulate pressure and accumulate fluid flow at the wellhead.

The FWC prevents freeze up problems caused by rapid gas expansion while optimizing production flow. Solar powered units with radios provide local control with remote monitoring and control capabilities.

Step rate and step pressure tests are user configurable. Data logging and differential pressure alarms are available for well monitoring and control.

The FWC was developed specifically for flowing well monitoring and control. It is fully configurable by the operator using an optional local interface, PDA or portable computer. The unit is supplied with typical parameters ready for specific application tuning. Setup parameters may also be downloaded from a Host Computer. Lockouts with notification provided from host and local interface.



  • Pressure control to prevent freeze ups and blockage
  • Direct turbine meter input
  • Wedge Meter® or Coin Meter® Flow Measurement for H2O
  • Manual valve override
  • Local / Remote switch
  • LEDs for easy status indication
  • End element trend buffers


  • DUKS local operator interface
  • RTU Link: Hand held with rugged serial port and interface software
  • 12 VDC @ 10 A battery backed supply
  • 10 A-H/day solar power supply
  • Communications: Wire line to wireless Ethernet

Software Functions

The Flowing Well Controller application program is divided into the following modules:

  • Elapsed time counter module
  • LCD and key pad user interface module
  • Time of day module
  • Gauge off time module
  • Field input scaling and alarm handler module
  • ESD control module
  • Control valve module
  • Control valve override module
  • ESD and run-time totalizer module
  • End element buffer module
  • Watchdog timer with recovery


Enclosure: 18" x 16" x 8" NEMA 4X enclosure
  Bailey controller hinge mounted replacement kits available
  Bristol Babcock replacement kits available
Operating temperature: -40 to 158 deg. F (-40 to 70 deg. C)
Relative humidity: 5 to 90% non-condensing
Power required
Typical: 12 VDC, 24 VDC, 110 VAC and custom power supplies available. For most Permian Basin area controllers with radios, we recommend a solar power supply, 55 Watt panel and 100 A-H Gel Cell battery with a charging regulator, load shed module (LSM) and RTU power distribution board (RPDB)
CPU / Memory
CPU: 8 MHz CMOS 65C816, 16 bit
Memory: 256 kB battery backed RAM, 256 kB EPROM
Digital inputs: Eight 1500 VDC optically isolated; 10 mA sense current single ended
Analog inputs: Four 4-20 mA or 1-5 VDC (user selectable) non-isolated A/Ds
Relay outputs: Two 7.5 A 30 VDC DPDT for valve actuator control and two 2 A 30 VDC DPDT
Turbine meter input: One 30 mV to 10 Vpp, 10 to 3 kHz
Pulse input: One optically isolated 0 to 2,500 Hz 12 V sink to ground @ 10 mA
Miscellaneous: Optional multi-variable input through RS-485 bus (MODBUS RTU)
Three serial ports: One RS-232 local operator interface port, one RS-232 communications port and one optional RS-232 / RS-485 port
Radios: 110 bps wire line modems, licensed frequency, spread spectrum and wireless Ethernet radios are supported to 19,200 baud

Wedge Meter is a registered Trademark of ABB.
Coin Meter is a registered trademark of Preso Meter Corp.