The 1st PCP pump run within an oil nicely was completed by Griffin Pumps in September of 1980 at Lloydminster Saskatchewan Canada and, determined by the conclusions of that examination, five more have been operate in January 1981. These apps were all in weighty sandy oil wells. Considering that then the PCP pumps are already used in lighter, larger water Minimize wells of as much as 35 API and one hundred % water and volumes as substantial as 650 m3/working day.
The screw pump advantage in excess of other forms of artificial elevate such as beam pumping and ESP is the fact it could take care of solids for instance sand and operate at an additional economic Price with significantly less servicing.
The PCP pump can considerably Enhance the economics of the subject in two ways
A) reduce capital Value
B) lessen functioning cost
An additional advantage of the screw pump method is the fact that it makes use of precisely the same tubing and rods as regular beam pumps as well as rotor landing methods are similar to that of spacing out the plunger on a conventional rod pump. This results in minimum amount teaching for provider rig personnel.
The basic principle on the PCP pump is always to produce tension and elevate the fluid. This can be carried out by building equal and distinct cavities everywhere in the pump size as the rotor rotates from the stator. Some pumps could have as many as fifty or additional cavities, depending on the raise need. The differential stress important to raise the fluid is then break up up Similarly amongst many of the cavities. As a result, with a pump with 50 cavities, the differential strain throughout Every cavity is 1/fiftieth of the full necessity.
Along with the differential so reduced across Just about every cavity, softer elastomers that can take care of sand is usually employed.
Pump action occurs once the rotor is popping in a very clockwise direction inside the stator and each rotation with the rotor will displace two cavities and build two cavities at the inlet in the pump. This is due to The reality that, inside of a PCP pump, the rotor is an external single helical equipment and also the stator is actually a double inner helical gear. This can be what is commonly called a 1:2 geometry pump.
Consequently you'll be able to boost and decrease the output from the pump by merely changing the rotor velocity. Velocity is suitable to generation. Theoretically, the speedier the rotation on the rotor, the higher the output of PCP pumps. The actual creation of the pump will fluctuate and will be somewhat less which the theoretical creation, as a result of pump slip. As you improve the differential strain across the pump the slip quantity will increase. To offset the slip and to keep a continuing manufacturing quantity, it is possible to boost the velocity.
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When you draw the fluid stage down, the differential stress boosts as well as the slip will also enhance causing a lower output charge. This is what on earth is referred to as pump effectiveness.
The PCP pump slip is usually controlled by rotor /stator in shape, by making use of a tighter suit for better efficiency and minimal pace for major oil as well as a looser healthy for lower efficiency and higher pace for gentle oil.
The pump has two pieces: the rotor and also the stator. So far as mend and servicing of both of these factors is concerned, once the stator is broken or even the rubber is swollen, it must get replaced; the rotor might be rechromed if there is no harm to the Main alone.
The drivehead is made of a few pieces: the bearing that retains the rod pounds, the again spin Command and also the generate mechanism. There are several kinds and variations of drives created all around the entire world; on the other hand, all of them include the a few essential capabilities of the drivehead.
All travel heads are Geared up that has a backspin retarder or brake that controls the spring torque saved from the rod string.
In the event the device is shut down or looses electricity, the rod torque will unwind and, because the fluid level equalizes, the downhole screw pump turns right into a motor, turning the rod string from the bottom. Therefore, it is vital to have a Look at valve to the circulation line as near the very well head as you possibly can, to halt the fluid from flowing with the movement line again down the effectively.
Anchoring of your tubing is significant within the larger PCP pumps wherever the pump torque is greater when compared to the tubing makeup torque and, If your services rig will not be equipped with electricity tongs to torque the tubing connections to the ideal price. Since the reactive torque in the stator is remaining-hand, the tubing will again off and component, if It's not necessarily torqued properly or anchored.
In an effort to continue to keep optimum manufacturing it is crucial that The underside gap pressure isn't drawn down under the bubble place. When this happens, totally free gas will enter the pump along with the pump performance will fall off radically. The pump will not gas lock and, to try and offset this issue, the pump inlet should be lowered below the perforations As well as in Extraordinary circumstances a downhole separator should be utilized.