USER GUIDE
13
PCS 4000
SINGLE WELL CONTROLLER
The C in the example above shows that the CASING
DROP PRESSURE was reached after 10 minutes and 20
seconds of OPEN TIME (and B OPEN TIME, if any). The
plunger did not surface during that time or the arrival
sensor malfunctioned. Test the sensor. If it is OK, the
CASING DROP PRESSURE may need to be increased.
If you are not using CASING DROP PRESSURE, set it to
0 psi.
B DELAY TIME =
☛
SET B2
B DELAY TIME is normally set to 00:00:00.
For those few wells that have liquid trailing behind the
plunger, you may want to set a few seconds of B DELAY
TIME to let the liquid clear out of the dump valve on the
separator.
When the B DELAY TIME is set and when the plunger
arrives during the B OPEN TIME countdown, the
controller delays closing the B-valve by starting the
B DELAY TIME countdown. When the countdown reaches
zero, the controller closes the B-valve and starts the
DELAY TIME (SALES) countdown.
Sales-Line Safeguard Features
LOW LINE CLOSE PRESSURE =
☛
SET 15
If the sales line pressure reaches this low value, the
controller prevents the A-valve from opening and closes
the A-valve if it is open. If you don’t want the controller
to monitor low sales line pressure, set LOW LINE CLOSE
PRESSURE to 0 psi.
HIGH LINE CLOSE PRESSURE =
☛
SET 14
If the sales line pressure reaches this high value, the
controller prevents the A-valve from opening and closes
the A-valve if it is open. You can use HIGH LINE CLOSE
PRESSURE to shut-in the well when the line pressure
increases to the point where the plunger will not surface.
Venting:
If the HIGH LINE CLOSE PRESSURE is reached
during B OPEN TIME, which is used to vent the well, the
controller does not close the B-valve.
DELAY LINE CLOSE TIME =
☛
SET B8
If you are using HIGH LINE CLOSE PRESSURE, LOW
LINE CLOSE PRESSURE, or both, you can use DELAY
LINE CLOSE TIME to keep the controller from shutting
in the well if there is a brief spike or drop in sales line
pressure. Brief spikes in pressure often occur when the
controller opens the well after an extended shut-in period.
When the controller opens the A-valve, it does not
monitor the sales line pressure during the DELAY LINE
CLOSE TIME period.
Example:
DELAY LINE CLOSE TIME is set at 6 minutes.
When the controller opens the well and starts to count
down the OPEN TIME, there is a 3 to 5 minute spike in
line pressure.
For the first 6 minutes of the OPEN TIME countdown,
the controller does not shut-in the well even if the
HIGH-LINE CLOSE PRESSURE is reached.
After 6 minutes, the controller shuts in the well if the
high line condition still exists.
DELAY TIME (SALES) =
☛
SET 02
DELAY TIME (SALES) sells gas through the A-valve after
the plunger has arrived.
Set DELAY TIME (SALES) to the maximum time that you
want to sell gas.
Example: A well normally sells gas for 5 hours. Set DELAY
TIME (SALES) to 6 hours.
If you want to limit how long the well flows after a plunger
arrival for any reason, program DELAY TIME (SALES).
Important!
You
must
set the DELAY TIME (SALES). The
controller closes the A-valve in response to the first
“close” input: DIFFERENTIAL CLOSE PRESSURE (DIP),
LOW FLOW RATE, CRITICAL FLOW K FACTOR, or
DELAY TIME (SALES). If DELAY TIME (SALES) is 00:00:00,
the controller closes the A-valve when the plunger arrives.
In pressure operation, you want the controller to close the
A-valve in response to pressure or flow rate input.
