The very first PCP pump operate within an oil well was carried out by Griffin Pumps in September of 1980 at Lloydminster Saskatchewan Canada and, determined by the conclusions of that take a look at, five added have been run in January 1981. These programs were all in hefty sandy oil wells. Due to the fact then the PCP pumps are actually utilized in lighter, larger water cut wells of up to 35 API and a hundred % drinking water and volumes as large as 650 m3/working day.
The screw pump gain about other kinds of artificial elevate for example beam pumping and ESP is it can contend with solids for example sand and operate at yet another economic Charge with considerably less maintenance.
The PCP pump can considerably improve the economics of the field in two strategies
A) reduce cash Price
B) lessen running cost
A different advantage of the screw pump technique is it takes advantage of the exact same tubing and rods as standard beam pumps as well as rotor landing methods are comparable to that of spacing out the plunger on a conventional rod pump. This leads to minimum amount education for service rig personnel.
The theory with the PCP pump is to create tension and lift the fluid. This can be performed by creating equal and unique cavities all around the pump size as being the rotor rotates in the stator. Some pumps can have as a lot of as fifty or added cavities, based on the lift necessity. The differential stress required to raise the fluid is then split up equally among all of the cavities. As a result, on the pump with 50 cavities, the differential stress across each cavity is one/fiftieth of the overall prerequisite.
Along with the differential so very low across Each and every cavity, softer elastomers that will deal with sand can be used.
Pump motion occurs when the rotor is popping in the clockwise route inside the stator and each rotation with the rotor will displace 2 cavities and produce two cavities for the inlet in the pump. This is because of The truth that, in a PCP pump, the rotor can be an exterior single helical equipment and also the stator is a double inside helical gear. This is often what is often known as a one:two geometry pump.
For that reason you'll be able to maximize and decrease the output of your pump by simply changing the rotor pace. Velocity is pertinent to output. Theoretically, the more quickly the rotation from the rotor, the upper the output of PCP pumps. The actual creation of the pump will fluctuate and will be rather considerably less that the theoretical generation, as a result of pump slip. When you improve the differential stress through the pump the slip volume boosts. To offset the slip and to keep a continuing production volume, you could raise the velocity.
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When you draw the fluid stage down, the differential tension raises plus the slip may also enhance causing a decrease creation level. This can be what on earth is referred to as pump efficiency.
The PCP pump slip might be managed by rotor /stator in good shape, by using a tighter suit for better performance and low speed for hefty oil and also a looser in good shape for lower efficiency and higher speed for light oil.
The pump has two components: the rotor and the stator. As far as repair and maintenance of these two factors is anxious, as soon as the stator is weakened or maybe the rubber is swollen, it has got to get replaced; the rotor is often rechromed if there is not any harm to the Main by itself.
The drivehead includes three parts: the bearing that retains the rod body weight, the back again spin Handle as well as the generate system. There are plenty of styles and kinds of drives made all over the world; having said that, all of them incorporate the a few standard functions of the drivehead.
All travel heads are Outfitted using a backspin retarder or brake that controls the spring torque saved from the rod string.
If the unit is shut down or looses energy, the rod torque will unwind and, as the fluid amount equalizes, the downhole screw pump turns into a motor, turning the rod string from The underside. As a result, it is very important to possess a check valve to the movement line as near the effectively head as possible, to prevent the fluid from flowing from the circulation line back down the properly.
Anchoring of the tubing is significant on the much larger PCP pumps exactly where the pump torque is better compared to the tubing make-up torque and, if the support rig is not really equipped with electricity tongs to torque the tubing connections into the optimum worth. For the reason that reactive torque of your stator is left-hand, the tubing will back off and element, if It's not necessarily torqued correctly or anchored.
As a way to retain the best possible output it's important that the bottom hole stress just isn't drawn down under the bubble position. When this happens, absolutely free fuel will enter the pump plus the pump performance will fall off considerably. The pump will likely not fuel lock and, to try to offset this problem, the pump inlet needs to be lowered beneath the perforations and in extreme circumstances a downhole separator ought to be used.