Abstract
The load frequently oscillates in large amplitude like pulses when the draw-works lift or lower in the oil well drilling rig, and that makes the diesel engine run uneconomically. A new solution for the pulse load problem is to add a motor/generator set and a flywheel energy storage (FES) unit to the diesel engine mechanical drive system to form a hybrid power system with energy storage. The storage capacity of the power and energy, and the charging-discharging operation modes are discussed for the first time. The engine power output in frequent fluctuation was measured in the oil well drilling engineering practice. The configuration and the theoretical model of the hybrid power system with energy storage and peak load leveling were established. Furthermore, 1% to 12% saving of fuel is possible for the case of single engine in the load leveling running mode compared to bi-engines in a traditional running mode for the peak load between 900 to 1200 kW and the valley load between 200 to 600 kW. The experimental verification of the load leveling with FES confirmed that the diesel engine worked more smoothly with less smoke emission. In addition, 5% to 10% more fuel was consumed in the load leveling test compared to the traditional running mode with the drive-by 800 kW diesel engine. However, 21% fuel saving was obtained in the load leveling test with the drive-by 400 kW diesel generator.
Highlights
The exhaustion of fossil fuels, the environmental pollution from fuel emissions, and the fuel cost savings have greatly promoted the development of new technologies such as renewable energy electricity, hybrid power system for vehicles, energy saving, and emission reduction
Energies 2019, 12, 606 air vessel was adopted in the energy saving oil drilling rig to store the energy of the motor at idle time and recover the potential energy released by the drill stem when lowered [4]
The energy storage system is crucial for the power system with a peak load leveling function in which the energy is transferred along the time dimension
Summary
The exhaustion of fossil fuels, the environmental pollution from fuel emissions, and the fuel cost savings have greatly promoted the development of new technologies such as renewable energy electricity, hybrid power system for vehicles, energy saving, and emission reduction. In the novel hybrid power system for a drilling rig, the electric motor/generator assembled in the compound chain box is the key to store the redundant power of the diesel engine in the valley load and release power to bear the pulse peak load. The peak load leveling system consists of two diesel engines, a compound chain box, a peak load leveling motor/generator (PLL M/G), a flywheel energy storage set, the control system, and the draw-works machine. In the light load cases, the diesel engine drives the flywheel to accelerate and store energy through the peak load leveling motor/generator (working as a generator) rotating with the compound chain box. In the peak load leveling technology in the power system, the energy storage methods may be chemical battery, super-capacitor, or flywheel. To ensure that the engine smoothly runs for longer life, the load leveling experiments on the drilling rig verified the engine capacity configuration for energy saving
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