Direct-drive progressing cavity pump is a surface-driven system without gearbox or belt drive. The low-speed high-torque motor is directly connected to the polished rod. The VFD controls motor speed to directly drive the downhole pump. It is mainly used for heavy oil, high gas, sand and wax content wells.
Impure oil requires low-frequency high-torque starting
Synchronous motor may lose magnetism during load change or stall
High-temperature corrosive fluid accelerates stator rubber aging and pump jamming
Shaft energy release may cause runaway at shutdown
INVT GD350-13 VFD has built-in application macro for direct-drive progressing cavity pumps. Built-in braking unit in common power ranges. It supports synchronous and asynchronous motors, low-speed high-torque starting and torque release at shutdown.
View Larger ImageDirect Variable Frequency Drive, Energy Saving & Efficiency ImprovementEliminates belt or gear mechanical transmission to enhance energy efficiency.
Open-loop Vector Control, Smooth StartupOpen-loop vector starting ensures no impact on the power grid.
Controllable Stop, Stable ShutdownIntegrated torque release algorithm enables safe and smooth shutdown without overspeed.
Special VFD for oilfield applications with built-in braking unit, eliminating external braking units and saving installation space.
Integrated torque release algorithm with multi‑stage reverse release ensures smooth shutdown without overspeed.
Built-in MTPA algorithm for IPM synchronous motors provides high starting torque with low output current.
Electric Drive Rig
The oil rig is driven by frequency conversion technology, enabling the drawworks to output maximum torque at zero speed and ensuring the hovering function of the hoisting system. It completely changes the traditional driller operation mode and realizes automatic drilling feed through frequency conversion and full digital control technology.
Low-voltage Oil-to-Electric Retrofit
Diesel engines are replaced by direct-drive motors, eliminating hydraulic couplings to maximize transmission efficiency. Two original diesel engines are retained as backup. GD800 engineering VFD supports master-slave control and power balance for even load distribution.
Energy Storage Workover Rig
The electric energy-storage workover rig uses battery energy storage to compensate for insufficient transformer capacity, realizing peak cutting and valley filling for drawworks power fluctuation. It solves the problem that low-voltage grid power cannot meet high-power hoisting demand. It facilitates intelligent automatic control with excellent energy-saving effect.
Beam Pumping Unit
Beam pumping unit, commonly known as “nodding donkey”, is the main lifting equipment in rod pumping systems. It converts motor rotation into reciprocating motion of the sucker rod via four-bar linkage to drive the downhole pump.
Electrical Submersible Pump (ESP)
Electrical Submersible Pump (ESP) is a rodless pumping device. The multi-stage centrifugal pump and motor are submerged below the well fluid level. The motor drives the pump to lift well fluid to the surface. It is mainly used in medium-to-high production low-viscosity oil wells.
Tower Pumping Unit
Tower pumping unit, also known as long-stroke pumping unit. It uses vertical tower structure instead of traditional beam, and wire rope & drum instead of four-bar linkage. It realizes direct vertical lifting and lowering of sucker rod, avoiding shortcomings such as short stroke, low efficiency and heavy weight.
Oil Transfer Pump
Oil and gas storage and transportation link the upstream and downstream industries of the energy sector. The safe and efficient transmission of energy is a key part of social development, along with economic growth and the transformation of the energy structure.INVT medium-voltage frequency converters are widely applied in oilfield sites and have won unanimous praise from users in applications such as natural gas compressors and large oil transportation pumps.
Natural Gas Compressor
Natural gas compressor is the “heart” of long-distance natural gas pipelines. It compresses and boosts natural gas to provide required pressure for pipeline transportation, and is key equipment for reliable pipeline operation.
Low-Voltage Hot Redundant VFD
Hot redundant frequency converter consists of one main control converter and two low-voltage converters of the same specification.In case of a fault in the active converter, the system can automatically and seamlessly switch to the standby converter within milliseconds, ensuring uninterrupted and continuous operation of critical loads such as compressors, pumps and fans.
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