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6
Quick Reference Guide: Mode 4
PCS 3000
ULTRA FLOW
How Pressure Operation Works
1The controller closes the A-valve and counts down
the OPEN time DELAY (SET 05). This gives the
plunger time to fall to the bottom of the well. The
display status shows CLOSED 00:00:00.
Note:
CLOSE time is normally set to 00:00:00
because the controller opens the A-valve in
response to changes in pressure. For more
information, see “CLOSE Time” on page 10.
2 While the A-valve is closed, the casing pressure
rises. The controller monitors casing pressure minus
sales line pressure. It opens the A-valve when:
▪
The difference between casing and sales line
pressure is equal to or greater than the
DIFFERENTIAL OPEN PRESSURE (SET 12)
value,
and
▪
The OPEN time DELAY countdown has reached
zero.
Go to step 3.
If the DIFFERENTIAL OPEN PRESSURE value is
reached during the OPEN time DELAY countdown,
the display status shows the OPEN time DELAY
remaining.
Note:
To open the well when the casing pressure
peaks (instead of using the DIFFERENTIAL OPEN
PRESSURE), see “CASING PEAK Time and CASING
RISE PRESSURE” on page 10.
3The controller opens the A-valve and counts down
the OPEN time (SET ON).
▪
If the plunger arrives during the OPEN time
countdown, the controller goes to step 5.
▪
If the plunger does not arrive during the OPEN
time countdown, the controller goes to step 4.
4 The controller opens the optional B-valve and
counts down the B OPEN time (SET B ON).
▪
If the plunger arrives during the B OPEN time
countdown, the controller goes to step 5.
▪
If the plunger does not arrive during either
OPEN time or B OPEN time, the controller
closes the A-valve and B-valve and counts
down the MANDATORY SHUT-IN time
(SET 03). When this countdown reaches zero,
the controller opens the A-valve. Go to step 3.
Note:
If the well has liquid trailing behind the
plunger, you may want to set B DELAY time. See
“B DELAY Time” on page 11 for more information.
5 The controller monitors the casing pressure for a
minimum value and counts down the DELAY time
(SALES) – SET 02.
Note:
Normally DIFFERENTIAL CLOSE PRESSURE
(SET 13) controls the sale of gas, and the DELAY
time (SALES) does not reach zero. For more infor-
mation, see “DELAY Time (SALES)” on page 9.
6 When the casing pressure starts to build, the con-
troller monitors the increase in pressure. When the
increase equals the DIFFERENTIAL CLOSE PRES-
SURE value, the controller goes to step 7.
7The controller counts down the DELAY CLOSE time
(SET 08). When the DELAY CLOSE time count-
down reaches zero, the controller checks the casing
pressure again to see if it has still increased by the
DIFFERENTIAL CLOSE PRESSURE value.
▪
If the increase is a brief spike in pressure, the
controller continues the DELAY time (SALES)
countdown. Return to step 6.
▪
If the increase is an actual or solid pressure increase,
the controller closes the A-valve and starts to
count down the OPEN time DELAY. Go to step 1.
Sales Line Pressure Safeguards
At all times, the controller makes sure that the sales
line pressure is within a range of safe values: the HIGH
LINE CLOSE PRESSURE (SET 14) and LOW LINE
CLOSE PRESSURE (SET 15). If the sales line pressure
goes outside these values, the controller prevents the
A-valve from opening. If the A-valve is open, the
controller closes it.
