Abstract
ABSTRACT An energy-recovering workover rig with variable inertia flywheel is investigated, and its basic structure and working theory are introduced. The variable inertia flywheel is composed of three identically sized flywheels with a mass of 458 kg each. It stores the energy of an idle motor as the tubing string is raised, as well as the potential energy released by the tubing string when it is lowered. The power of this rig decreases remarkably as compared to that of a conventional rig, and it can also recover and reuse the potential energy of the tubing string. The energy recovered by the flywheels is about 3.9×105 kJ when a 2500 m-long tubing string is lowered. The mathematical model for when the workover rig raises the tubing string is deduced, and simulation analyses are conducted. Through simulation, the curves of the rising velocity of the tubing string and displacement with time are obtained, and the following conclusions are reached: the heavier the tubing string, the lower the velocity of the ...
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