Study on Hydraulic Energy-Recovering Workover Rig and the Simulation for Lifting the Pipestring

[+] Author and Article Information
Zhang Lujun

School of Mechanical and Automotive Engineering, Yantai University, Yantai 264005, P.R.C.

J. Energy Resour. Technol 129(2), 96-101 (Oct 07, 2006) (6 pages) doi:10.1115/1.2718578 History: Received May 29, 2005; Revised October 07, 2006

In this paper, an advanced energy-saving petroleum machinery, the hydraulic energy-recovering workover rig, is researched. The equipped power of this rig is only one third of an ordinary rig, and this rig can also recover and reuse the potential energy which is released by the pipestring when lowered. The special working theory of this rig is introduced. An energy-saving analysis is conducted. Analysis shows that when lowering the pipestring which weighs 260kN, the energy recovered by this rig is about 240×106J. The mathematical model of lifting the pipestring is established and a simulation analysis is conducted. Through simulation, some conclusions are obtained: (1) the lighter the pipestring the shorter the pipestring lifting time; (2) the smaller the throttle valve path area the longer the pipestring lifting time; (3) the smaller the air vessel volume the shorter the pipestring lifting time. The actual measurement results prove that the simulation results are right.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 1

Hydraulic system diagram

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Figure 2

Composite cylinder lifting part diagram

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Figure 3

Model diagram lifting pipestring under force-grade 5

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Figure 4

Force on hook and pipestring

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Figure 5

Force on steel chain

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Figure 6

Force on plunger, traveling block, and their support

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Figure 7

Force on oil-storing cylinder piston

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Figure 8

Curve of time t with pipestring weight G3 under a=13.96cm2, V2=1.68m3

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Figure 9

Curve of time t with throttle valve path area a under G3=170kN, V2=1.68m3

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Figure 10

Curve of time t with air vessel V2 under G3=170kN, a=13.96cm2



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