The Design And Development Of Wide Production Progressive Cavity Pumps

Surface Drive and PC pump (Progressive Cavity Pump) is a new type of artificial lift system, which finds more and more applications in the oil fields. Surface drive suspends and rotates rod string and power is then transmitted down hole, which in turn drives the PC pump.PC pump consists of two parts: rotor and stator. The high strength, chrome-plated rotor is the only moving part of the PC pump. The stator is a kind of tube with elastic synthetic rubber molded inside. A variety of elastomeric is available for different applications. When rotor rotates in the stator, a series of sealed cavities are formed and these cavities move axially from the intake end to the displacement side. When one cavity disappears at the displacement side, a new cavity will form at the intake side. Through continuous formation, motion and disappear of these cavities, fluid is then brought to the surface.MAIN ADVANTAGES1. Wide Well Fluid RangeIncluding viscous oil with the viscosity up to 5000 mPa·s, high wax bearing crude oil and high sand cut oil for the stator has resilience to sand.2. Without Gas LockSolution gas can not be released out, the fluid moves continuously and evenly and it's impossible for gas lock due to no valves in the pump.3. High EfficiencyFew moving parts, no valves and complex channels, low hydraulic loss so the efficiency can be up to 70%.4. Uniform Flow and Easily AdjustedBy changing the speed of the surface drive, it could adjust the pump flow easily.5. Wide Production Range Daily production can be 10 to 2500 BPD.6. Simple Operation and Low CostSimple surface equipment, compact design and low cost so the pump has the advantages of simple operation, little maintenance and lower running cost.