Progressive Cavity Pump
Progressive Cavity Pump
Progressive Cavity Pump
Pump (PCP)
A PCP consists of a single rotor which rotates inside
stator, the rotor is made from high strength steel and
.stator from elastomer
When the rotor is inserted in the stator, two chains of
cavities are formed and as the rotor turns within the stator
.the sealed cavity moves up and carries the well fluid
The rotor is attached to the sucker rods and stator
.attached to the tubing
PCP Equipment
.Surface Equipment
.Down hole Equipment
.Accessories
-:Surface Equipmen
Top Drive and Motor
:The functions of the drive head are
To transmit the rotation to the rod string (belts, pulleys, hex
.shaft)
To carry the load of the rod string and that of the fluid in
.the tubing (rod clamp)
.To isolate the drive unit from the well fluid (stuffing box)
.To control the backward rotation (brake system)
Speed Reduction in the drive System
Sucker rods
Sucker Rod Centralizers
Rotor
Stator
Pup joint
Stop bushing
Torque anchor
Sucker rods
Sucker rods function is to transmit the rotation from Top
.Drive to the rotor
.The max stress is at the top of the rod string
.Sucker rod length 25 or 30 ft
Pony rods 1- 2- 4- 6- 8- 10- 12 ft
Rotor
Rotor is a single piece, total length of the rotor exceeds that of the
.stator by 0.45 to 0.50 m
There are different temperature codes and different out side
diameters for each type of rotor, the higher the code the smaller
.out side diameter
Temperature codes
Rod String and Rotor
Stator
Stator is made from elastomer. The elastomer properties
affected by the gas/liquid ratio and the temperature at the
.pump setting depth
The common changes in elastomer mechanical
:properties are
Swelling which leads to excessive interference between .rotor and stator
.Hardening which leads to loss the elastomer resilience -
Pup Joint
The pup joint function is to allow for the movement of the
rotor head and it is coupling, because the inside diameter
.of the tubing is small
The common length of this joint is 4 ft and the out side
.diameter is 4 inch
Stop Bushing
Is connected to the bottom of the stator, it provides length
of 0.30 m for possible elongation of the rod and serves as
.landing spot during spacing out
Torque Anchor
When the rotor rotates clockwise, it is friction against the
stator tends to rotate the tubing clockwise and this creates
a risk of tubing disconnected, the torque anchor eliminates
.this risk
Accessories
Well Head
Tubing Drain
Power supply
Primary voltage and frequency, to determine the step
.down transformer
Troubleshooting
Well Diagnosis Procedure
Check with FPF to see the well status, if the well is shut in ask (1
the Field Forman to send field operator with you to re-start the
. pump
Read and record the shut in tubing head pressure and shut in (2
.casing head pressure before re-start the well
After re-started observe the Top Drive (The (3
breaksystem,belts,pulleys and the stuffing box)
.and the Motor and hear if there is abnormal noise
Wait about one hour for well fluid to move from bottom (4
.hole to surface
Read and record the flowing tubing head pressure, (5
flowing casing head pressure and flow line temperature.
If the pump dose not produces, the flow line temperature
.will be same as the ambient temperature
.Measure and record the RPM (6