Self-propelled Workover Rigs: Built for Fast Mobilization
Self-propelled workover rigs are workover rigs built on their own truck chassis, so they can drive themselves from well to well. They're the most common type of workover rig in the onshore oilfield, because they're fast and easy to mobilize. When a well needs service, you can drive the self-propelled rig out to the site in a few hours, set up, and start working — no need to wait for a separate truck and trailer to haul the rig there.
How Self-propelled Workover Rigs Work
A self-propelled workover rig has a telescopic mast mounted on the back of a heavy-duty truck chassis. The mast folds down when you're driving, so the rig is low enough to go under bridges and overpasses. When you arrive on site, you raise the mast, set the outriggers, and you're ready to work.
The rig has its own power system — usually a diesel engine that drives the hydraulic pumps and the drawworks. The drawworks is the winch that raises and lowers the drill string. On a workover rig, you're not drilling a new hole — you're pulling the existing tubing out of the well, doing the maintenance, then running it back in. So the drawworks is the most important piece of equipment.
Key Features
Mast Height and Capacity. This determines how much tubing you can pull at once. A taller mast lets you pull longer stands of tubing, which means fewer trips up and down. That saves time, and time is money in the oilfield.
Pullback Force. How much weight can the drawworks pull? This depends on the depth and size of the wells you're working on. Deeper wells with larger casing need more pullback force.
Winch Speed. How fast can you pull the tubing out? Faster winches mean faster jobs, which means more jobs per month, which means more revenue.
FAQ
Q: How deep can a self-propelled workover rig work?
A: Most self-propelled workover rigs can handle wells up to 3,000-4,000 meters deep. That covers most onshore oil and gas wells. Deeper wells need larger, heavier workover rigs — usually skid-mounted or semi-submersible.