Research Papers: Petroleum Wells-Drilling/Production/Construction

New-Type Energy-Recovering Hydraulic Workover Rig and the Simulation for Lifting the Tubing String

[+] Author and Article Information
Zhang Lujun

School of Mechanical and Automotive Engineering, Yantai University, Yantai 264005, People’s Republic of Chinazlj6910@163.com

Xie Hengshu

 Shandong Kangda Group Co., Ltd., Longkou 265701, People’s Republic of China

J. Energy Resour. Technol 130(3), 033103 (Aug 11, 2008) (6 pages) doi:10.1115/1.2955562 History: Received October 01, 2007; Revised May 22, 2008; Published August 11, 2008

A new-type energy-recovering hydraulic workover rig is researched. The basic structure and working theory of this rig are introduced. This rig decreases its equipped power remarkably compared with the conventional rig, and can recover the potential energy released by the tubing string when lowered. With infinite force-grade number, this rig can obtain the maximum lifting efficiency and energy-recovering rate. The dynamics model of lifting the tubing string is deduced and a simulation analysis is conducted. Through simulation some conclusions are obtained: (1) the greater the throttle valve path area the higher the tubing string lifting velocity, (2) the lighter the tubing string the higher the tubing string lifting velocity, and (3) the greater the displacement of the variable pump motor the higher the tubing string lifting velocity. The actual measurement results prove that the dynamics model and simulation results are basically right.

Copyright © 2008 by American Society of Mechanical Engineers
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Figure 1

Basic structure of the new-type energy-recovering hydraulic workover rig

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Figure 2

Force on oil-storing cylinder piston

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Figure 3

Simulation of AT=13.96 cm2, 6.98 cm2, and 3.49 cm2

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Figure 4

Simulation of W=200 kN, 220 kN, and 240 kN

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Figure 5

Simulation of V=200 ml/r, 180 ml/r, and 160 ml/r




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