Structural design for automatic smart hydraulic workover rig

Conventional minor workover operations involving workover rigs are characterized by prolonged working durations, low degrees of automation, high labor intensities and poor operation safety performances. To solve these problems, an innovative automatic smart hydraulic workover rig was developed. With the control mode by combining “PLC/Manual automatic coupling control multiple components through coordination + man/machine offline operations”, all key systems of the workover rig can work in well-coordinated manner to facilitate automatic and unmanned minor workover operations in oilfields. Instead of horizontal arrangement of pipe-string on the ground in conventional workover operations, the new workover rig works in a mode that pipe-strings are placed vertically near the wellhead and two joints are tripped out simultaneously. Furthermore, the new workover rig may also be used for tripping of one joint in one trip with conventional horizontal placement of pipe string on the ground. Compared with conventional operations, the new workover rig can reduce the operation time by approximately 20%-30%. Fully driven by hydraulic system and with hydraulic accumulator system newly deployed, the new workover rig can save energy through configuration of driving modes with variable loads. In addition to facilitate remote control, the new workover rig mcan effectively enhance safety performance of workover operations.