加拿大潜油螺杆泵

Rodless PCPProgressing cavity pump combined with submersible electrical motor for artificial lift solutions

APPLICATIONS

■ Progressing cavity pump (PCP) wells

■ High dogleg severity (DLS) wells suit-

able for PCPs

■ Wells with restrictions of rod or

tubing wear or wax problems

■ Offshore heavy oil wells

BENEFITS

■ Eliminate restrictions to running PCP

in wellbore with high DLS

■ Reduce all PCP failures caused by

rod string and tubing wear

■ Decrease torque and pressure losses

in relation to high-viscosity fluid

■ Reduce torque by 20–60% with the

elimination of rod string

■ Improve overall efficiency

■ Reduce power consumption

■ Increase safety without having rod

backspin on the surface

■ Avoid leakage at surface without

having a stuffing box

■ Lower wellsite maintenance cost

■ Minimize noise disturbance

FEATURES

■ Permanent magnet motor (PMM)

based downhole drive

■ Broad range of PCP speed from

50–500 rpm

■ Constant torque in the entire range

of speed

■ PMM applicable control panel in

NEMA4 enclosure

■ Completion and various components

are compatible with conventional ESP

■ Canadian standards association

(CSA) and underwriters laboratories

(UL) certifiedThe most typical PCP failure occurs from sucker rod or tubing wear. The severity of wear is determined by various factors such as DLS, water cut, and sand cut. The wear is especially high for deviated and horizontal wells. KUDU Rodless PCP* eliminates all rod failures, resulting in a 30–50% decrease in system failure rates. This technol-ogy also allows for pump installations in a high DLS or horizontal section of the well.Rodless PCP componentsA low-speed downhole PMM drive and a PCP are capable of working together in challenging PCP wells without being limited by deviation profile. Every component of a KUDU Rodless PCP is selected based on well conditions and the customer’s operational parameters, such as production target rate. All other system components are selected dependent on the PCP and motor combination.KUDU Rodless PCP SpecificationsProduction rate12–1,900 [2–300]Maximum setting vertical depth, ft [m]6,500 [2,000]Maximum downhole temperature?, degF [degC]300 [150]Operational speed range, rpm50–500Maximum power capacity, hp [kW]60 [45]Power supply requirements, V [Hz]Three-phase 380–480 [50–60]Maximum pump axial load, lbs [kg]13,200 [6,000]Minimum casing size, in [mm]5.5 [139.7]?Based on pump model, fluid level, and pump setting depth.? Maximum temperature for PMM.PMM technology PMM downhole drive is a proven technology that has been used with regular ESPs for many years and in PCP applications since 2003. A synchronous machine incorporating rare earth magnets in its rotor KUDU Rodless PCP.design, a PMM provides the following benefits:■ improve efficiency due to low power loss in the rotor■ increase power density with a shorter motor ■ enhance dynamic performance by providing a variable frequency drive (VFD) specifically designed for PMM.By adopting a low-speed PMM, KUDU Rodless PCP provides constant torque in the entire PCP speed zone, ranging from 50 rpm to 500 rpm. Such system flexibility enables easy adjust-ment to a broad range of well production rates without replacing the pump. The downhole assembly is effective in high temperatures of up to 300 degF (150 degC) and is corrosion resistant with special coating.