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Research has been done on an energy-saving type of hydraulic workover rig. This rig canrecover and reuse the potential energy which is released by the pipestring when lowered, and theequipped power of this rig is only one third of an ordinary rig. The structure and theory of this rig areintroduced. The mathematical model of lowering the pipestring is established and a simulation analy-sis is conducted. Through simulation some conclusions are obtained: The lighter the pipestring is, theless velocity of lowering the pipestring is; The smaller the throttle valve path area is, the less velocityof lowering the pipestring is; Different air vessel volumes have no evident effect on the pipestringlowering velocity. The actual measure results prove that the simulation results are right. Finally, theenergy-saving effect of this rig is proved by the field test results.
Research has been done on an energy-saving type of hydraulic workover rig. This rig canrecover and reuse the potential energy which is released by the pipestring when lowered, and theequipped power of this rig is only one third of an ordinary rig. The structure and The mathematical model of lowering the pipestring is established and a simulation analy-sis is conducted. The mathematical model of lowering the pipestring is established and a simulation analy-sis is conducted. the actual measure results prove that the simulation results are right. Finally, the energy-saving effect of this rig is proved by the the field test results.