The knowledge you need to know about PCP pumps

The main PCP pump operate within an oil nicely was performed by Griffin Pumps in September of 1980 at Lloydminster Saskatchewan Canada and, according to the conclusions of that examination, five supplemental were run in January 1981. These programs have been all in significant sandy oil wells. Because then the PCP pumps are already utilized in lighter, better h2o Slash wells of up to 35 API and 100 % water and volumes as high as 650 m3/day.

The screw pump advantage more than other forms of synthetic elevate including beam pumping and ESP is it could cope with solids like sand and work at a further economic Price tag with a lot less servicing.

The PCP pump can greatly Increase the economics of a industry in two strategies

A) reduce capital Charge

B) reduced functioning Charge

Yet another advantage of the screw pump process is it uses the exact same tubing and rods as traditional beam pumps and the rotor landing treatments are similar to that of spacing out the plunger on a standard rod pump. This results in bare minimum training for support rig staff.

The principle with the PCP pump would be to crank out pressure and raise the fluid. This is often completed by developing equivalent and distinct cavities all over the pump size given that the rotor rotates inside the stator. Some pumps should have as several as 50 or more cavities, according to the elevate need. The differential pressure essential to elevate the fluid is then break up up Similarly among the all the cavities. Consequently, on the pump with 50 cavities, the differential strain across Every single cavity is one/50th of the whole prerequisite.

Along with the differential so small throughout Each individual cavity, softer elastomers which can handle sand can be used.

Pump motion happens once the rotor is turning inside a clockwise path within the stator and every rotation of your rotor will displace two cavities and generate 2 cavities in the inlet of the pump. This is because of The reality that, in the PCP pump, the rotor is undoubtedly an external one helical equipment as well as the stator is really a double internal helical equipment. That is what is commonly often called a one:2 geometry pump.

Thus it is possible to improve and reduce the output on the pump by merely switching the rotor pace. Velocity is appropriate to manufacturing. Theoretically, the a lot quicker the rotation on the rotor, the upper the output of PCP pumps. The actual creation of the pump will fluctuate and may be fairly less the theoretical output, as a result of pump slip. When you boost the differential force across the pump the slip quantity raises. To offset the slip and to maintain a constant generation volume, it is possible to increase the pace.

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While you attract the fluid level down, the differential strain improves and also the slip can even improve leading to a lessen production charge. This is often what's often called pump performance.

The PCP pump slip may be controlled by rotor /stator healthy, by making use of a tighter match for larger effectiveness and very low velocity for heavy oil along with a looser in shape for decreased performance and better velocity for gentle oil.

The pump has two pieces: the rotor and also the stator. As far as restore and upkeep of these two components is concerned, once the stator is damaged or the rubber is swollen, it has to get replaced; the rotor is usually rechromed if there isn't any damage to the Main alone.

The drivehead contains 3 elements: the bearing that holds the rod excess weight, the again spin Command as well as travel system. There are various varieties and designs of drives manufactured everywhere in the entire world; nonetheless, they all include the 3 fundamental capabilities on the drivehead.

All drive heads are Geared up by using a backspin retarder or brake that controls the spring torque stored from the rod string.

Once the device is shut down or looses electric power, the rod torque will unwind and, since the fluid level equalizes, the downhole screw pump turns into a motor, turning the rod string from The underside. For that reason, it is very important to possess a Verify valve to the movement line as near the effectively head as feasible, to prevent the fluid from flowing within the circulation line again down the nicely.

Anchoring of your tubing is very important over the greater PCP pumps where by the pump torque is larger when compared to the tubing makeup torque and, In the event the assistance rig isn't Outfitted with electric power tongs to torque the tubing connections towards the ideal price. Considering that the reactive torque of the stator is left-hand, the tubing will back again off and aspect, if it is not torqued properly or anchored.

In an effort to continue to keep the best possible production it is vital that the bottom hole stress is just not drawn down underneath the bubble place. When this happens, free fuel will enter the pump and the pump efficiency will fall off dramatically. The pump won't gas lock and, to attempt to offset this issue, the pump inlet need to be decreased underneath the perforations and in Severe conditions a downhole separator needs to be employed.