Proven Iron Doesn’t Age — It Outworks



You don’t have to walk through many yards to spot the difference between rigs that were built to sell and rigs that were built to work. The 2012 Oilwell 840E lands squarely in the second camp.

With 1,500 HP under the hood, a field-proven walking system, and a power end that won’t flinch under load, this rig was designed to punch above its weight—and more than a decade later, it still does.

We’ve got one in stock right now, and it’s ready to roll. If you’re pricing out a new build and choking on the wait time (and the sticker shock), you might want to slow down and take a closer look at this machine.


Quick Specs — What You’re Working With


Rig: 2012 Oilwell 840E

Horsepower: 1,500 HP

Draw Works: E-3000

Walking System: 4-leg hydraulic walker

Power Source: Triple CAT 3512 engines

Mast: 147' 1MM with crown

Substructure: 30’ Box-on-Box with integrated pipe racks

This is a full-size, modern-capacity land rig with zero fluff and all muscle. It’s built for deep verticals, long laterals, and multi-well pads. And thanks to the walker setup, it’s made to keep moving.


So, What Makes It Better Than New?


Let’s break it down:


It's Already Built


No lead times. No fabrication delays. No waiting nine months while someone in a factory assembles your rig between other projects. The 840E is in our yard, inspected, and ready to load.


It's Proven


This isn’t a prototype. It’s not someone’s bright idea of what “might work better.” It’s been in the field. It’s drilled. It’s walked. And it’s done the job without flinching.


It’s Built for Rough Work


Modern rigs are slick. But sometimes, slick breaks. The Oilwell 840E is built like gear used to be—steel where it counts, smart mechanical systems, and minimal reliance on electronics that don’t like heat, mud, or vibration.


It Saves You Money


A rig of this caliber new? Easily $10–12 million. Our 840E? A fraction of that—without compromising what it can do. That’s money you can keep in the ground—or use to upgrade your pumps, trucks, or support gear.


Performance in the Field: Why Crews Like This Rig


We’ve talked to crews who’ve run this exact setup—and they all say the same thing: it’s reliable, fast to rig up, and easy to work on.

  • The walker’s got range. Four-leg hydraulic system with lateral travel makes multi-well pads a breeze.
  • The mast holds steady. Rated for heavy drill pipe and top drives, no excessive flex or instability.
  • The sub is smart. Plenty of room for pipe racks, tool access, and safe footing—even in winter.
  • The engine room’s familiar. CAT 3512s are everywhere, and your crew already knows how to service them.

There’s nothing over-complicated. That means less downtime, fewer specialty parts, and more hours turning to the right.


Red Flags You Won’t Find on This Rig


We’ve seen rigs with bent derricks, mismatched substructures, fried control panels, or mystery wiring. That’s not what we sell.

This unit has been:


  • Fully inspected — structural, mechanical, and electrical
  • Pressure tested — hydraulics, draw works, and walking systems
  • Documented — complete component list, engine hours, and maintenance history
  • Cleaned and stored properly — no rust-covered frame sitting out in a swamp


You’ll get the full walkaround, inspection notes, and videos before you even think about cutting a check.


Who Should Be Looking at This Rig?


If you're in:

  • Oil & Gas development
  • Geothermal drilling
  • Deep municipal or industrial water projects


…and you need something heavy-duty, mobile, and familiar, this is the rig for you. Whether you’re expanding your fleet or replacing an older, high-maintenance unit, the 840E lets you do it without blowing the capex budget.


Final Word: Why We Stand Behind This Unit


At Power Drive Supply, we don’t sell you something just because it’s on our lot—we sell it because we know it’s solid. The 2012 Oilwell 840E is one of those rare rigs that just checks all the boxes.

It’s been around long enough to prove itself. It’s big enough to do serious work. And it’s simple enough that your team can run it without needing a training manual and a laptop.

You want a rig that works hard, doesn’t complain, and keeps crews safe? This is it.

Want photos, spec sheets, or a live video walkaround?

Reach out today—we’ll show you exactly what you’re getting, talk straight about any wear items, and line up freight if it fits your program.

Because the next job’s not going to wait. And neither should your rig.