The REDA* Maximus* ESP system with integrated downhole measurement technology maximizes the reliability, performance, and overall ESP run life in artificially lifted wells. The system is designed to simplify installations by using exclusive connection technology with leak-tight seals and easily operated assembly.
Variable-rated for different applications, Maximus motors offer flexibility across all ESP wells and conditions, including severe weather. Maximus protector heads feature the same abrasionresistant bearing system successfully implemented in REDA pumps for more than 15 years.
Installation operations traditionally done onsite, such as protector shimming and oil servicing of motors and protectors, are now performed in the controlled environment of Schlumberger manufacturing and service centers. Factory-filled components arrive at the wellsite ready for faster and easier installations, minimizing risks and failures caused by human error.
The flexibility of Maximus components enables operators to configure their ESP systems as needed. The advanced Maximus offerings include
- bolt-on single and tandem motor designs;
- bolt-on modular protectors;
- ProMotor integral motor, protector, and sensor systems.
REDA Maximus motors allow configurations with as much as 540 hp in 5.5-in casing wells and more than 1,100 hp in 7-in and larger wells. The radial bearings in these motors and protectors feature self-lubricating, polymer-lined bushings and polished, hardened steel shaft sleeves that provide high load and temperature bearing capability, even under poor lubrication conditions.
MaxJoint* flange connection technology ensures that Maximus system motors and protectors are seamlessly connected at the wellsite with pressure-tight seals. The ability to quickly connect the factory-filled motor to the protector eliminates the need to service equipment when it is being installed, saving costly workover and rig time. This proprietary connection technology guarantees bubble-free oil with no contamination in the motor, even in extreme weather conditions.
Difficult field conditions often lead to improper filling of oil in the motor. MaxJoint connection technology preserves the superior quality of the contamination-free oil prefilled in controlled factory conditions. The Maximus motor incorporates a shipping cap that compensates for potential oil volume expansion and contraction caused by temperature changes during transportation and
storage of units.
The MaxLok* ESP motor lead extension is an integral component of the overall Maximus ESP system. A quick and simple plug-and-play connection, MaxLok extensions make assembly in extreme weather operations possible. They also eliminate the taping process of the pothead to the motor at the wellsite, considerably reducing assembly time. Maximus motors include a spring-loaded, sealed terminal block that prevents oil loss when the MaxLok extension is disconnected but allows pressure equalization when the motor head is attached.
The REDA Maximus ESP system fits with all of our existing pumps, which offer the widest capacity range in the industry, and includes premium materials and configurations ideal for nonabrasive to extremely abrasive well environments.
Gas handling
The Poseidon* multiphase gas-handling device is designed with helico-axial flow stages that provide a more efficient energy transfer than centrifugal stages, avoiding gas locking at high gas-volume fractions (GVF). The device can successfully handle GVF of more than 90% at the intake with up to 75% through the pump, far exceeding the GVF limits of conventional gas-handling devices. The system can be installed in conjunction with a gas separator or a standard intake, depending on the application.
Real-time downhole monitoring
The REDA Maximus system includes a gauge-ready base (GRB) at the bottom of the motor, which, upon removing the cap, can be directly connected to an ESP gauge for realtime monitoring of system and reservoir performance. The Maximus system motors are fully compatible with any of our Phoenix* downhole sensors and can be connected at the base or in the field without refilling the motor.
Location：Russia
TNK-BP Vanyoganneft operates the Van-Yogan field in the Nizhnevartovsk region of Russia, where winter temperatures are extremely cold. Though production potential from the wells is high, the actual production is limited by the 6 5⁄8-in casing commonly used in Russia. This casing size limits motor and pump options.
The production potential of the TNK-BP Vanyoganneft Well 8049 was more than 4,000 m3/d. However, because of the technical limitations of the equipment, the well was actually producing at about 650 m3/d. In addition, the competitor’s ESP run life ranged from 61 to 457 days. The opera¬tor contacted Schlumberger to provide a solution that would maximize production from the well and improve the run life of the ESP system.
The REDA Maximus ProMotor integrated system was selected for this job because it is not weather-dependent like other systems and installs more reliably and in less time, returning the well to produc¬tion faster and leaving no room for error at the wellsite. To achieve maximum production in a 6 5⁄8-in casing, a 540 Series REDA GN10000 150-stage compression-type pump and a 450-hp 456 Series REDA Maximus system were selected.
The REDA Maximus ProMotor system, which combines the motor, the protector, and a downhole sensor in one unit, was factory-assembled to save valuable rig time. The plug-and-play design of REDA Maximus motors and protectors, which were filled with a high-dielectric-capacity oil in the con¬trolled environ-ment of Schlumberger manufacturing plants and service centers, eliminated weather-dependent field-servicing operations. This reduced installation time and ensured the integrity of the equipment during assembly in harsh ambient conditions.
The REDA factory-shimmed compression pump design extends system reliability by transferring all the axial thrust developed by the stages to the high-load protector bearing, without the complication of setting the shafts during assembly at the wellsite.
Installed at –27 degC ambient temperature in less than 3 hours, the REDA Maximus ESP system saved at least 3 to 5 hours of installation time over conventional ESP systems. Production from the well increased to 1,100 m3/d from 650 m3/d, a 70% increase.
After 890 days of stable production, the unit was scheduled for a selec¬tive workover operation but showed minimal wear on either the motor or the pump. It was rebuilt, serviced with new oil, and sent back to the field for installation in another well. This operating time was 700% better than previous ESPs used in this field. Based on this performance, Vanyoganneft is using the REDA Maximus ProMotor system exclusively in this field.
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