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.
High Energy Consumption:Valve throttling regulation results in massive energy waste, with extremely low efficiency especially under low-load conditions.
Water Hammer Risk:Pressure surges easily occur during start-stop or sudden load changes, posing a threat to pipeline safety.
Frequent Maintenance:Components such as valves, couplings and bearings are prone to damage due to shock and overload.
Inaccurate Control:Coordination is difficult during parallel operation of multiple pumps, easily leading to flow competition and unbalanced loading.
Large oil transfer pumps are generally equipped with high-power motors and operated in groups as required by the design.A one-drive-multiple scheme is typically adopted. During startup, the frequency converter first drives one motor to start.When the operating frequency reaches the power frequency, the motor is switched to power frequency operation via the bypass.The frequency converter then starts the next motor, and so on. According to operational requirements, the last motor can be switched from variable frequency to power frequency operation,or its speed can be adjusted under variable frequency operation to meet process requirements.
View Larger ImageVariable Frequency Energy Saving:Operating with frequency converter follows the pump affinity laws, delivering lower energy consumption at lower speeds.
Eliminate Water Hammer:S-curve acceleration and deceleration realize soft pressure variation, protecting pipelines from impact.
Precise Control:Built-in PID, sleep function and other algorithms are ideal for pump loads. Communication integration enables remote and local control.
No additional reactive power compensation or harmonic treatment devices are required.
By adopting variable frequency regulation, energy is saved by adjusting motor speed, reducing equipment operation and maintenance costs.
Provides overcurrent, short circuit, overvoltage, undervoltage, phase loss and other protections. It has strong adaptability to power grid voltage fluctuations and a wide operating voltage range.
Supports Profibus-DP, Profinet and other communication protocols. Equipped with IoT modules to meet mainstream communication and networking requirements.
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.
Direct-Drive Progressing Cavity Pump
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.
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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