Design of Pusher-Arm Structure and Service Reliability Research for Oilfield Small Repair Well Operation Robot

Fanyeqi Yang; Yansong Wang

doi:10.6919/ICJE.202510_11(10).0015

Authors

Fanyeqi Yang
Yansong Wang

DOI:

https://doi.org/10.6919/ICJE.202510_11(10).0015

Keywords:

Minor Oilfield Workover; Pusher Arm; Structural Optimization; Finite Element Analysis; Electro-Mechanical-Hydraulic Coordination.

Abstract

To address the issues of low efficiency in manual operation and high safety risks during the tripping operation of small workover tubing in oilfields, this study proposes a functionally integrated pusher arm structure. The lifting slide rail module enables precise Z-axis positioning, the two-stage rotating arm controls the horizontal trajectory, and the crank-slider hydraulic clamp performs adaptive grasping, achieving the fully automatic transportation of Ø73-339.7mm tubing from the catwalk to the wellhead. The study combines the theoretical mechanics model with finite element simulation to systematically verify the structural reliability of key components under a 1500N limit load. UG software is employed to build a three-dimensional model and optimize the sectional moment of inertia. ANSYS Workbench is utilized for static and transient dynamic analysis, and ADAMS-AMESim co-simulation is used to verify the dynamic performance. The results indicate that the 45-steel fixture has a maximum stress of 76.58 MPa (with a safety factor of 3.36), the Q235 rotating arm has a maximum stress of 36.78 MPa (with a safety factor of 4.2), and the positioning accuracy can reach ±5 mm. After integrating the system into a 40-ton workover rig, the manual intervention at the wellhead is reduced by 82%, and the time for tripping a single tubing is shortened from 4.5 minutes to 2.1 minutes, which provides key technical support for the automation of oilfield workover operations.

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