Elevator (Drilling)
An elevator in drilling rig operations is a hinged mechanical clamping device used to grip drillpipe or other drillstring components for lifting and lowering operations during pipe handling — the elevator consists of two roughly semicircular arms hinged at one end that can be opened to admit a tubular component and closed around it to form a load-bearing ring with an inside diameter slightly larger than the pipe body but smaller than the upset (the shoulder or taper at the pipe end where the connection is welded or formed); when closed, the elevator arms are latched together with high-strength latching mechanisms (typically pin-type or wedge-type latches) that maintain the closed position under the substantial loads of suspended pipe; the closed elevator is then attached to the rig's traveling block (or to the rig's hoisting equipment more generally) through a load-bearing connection (typically a bail or links), allowing the entire weight of the suspended drillpipe stand to hang from the elevator while the latches hold the arms together; in the open position, the device splits into two halves that swing away from each other along the hinge axis, allowing the drillstring to pass through the open elevator gap so that connections can be made or broken without the elevator interfering with the pipe-handling operations on the rig floor; elevators are sized to match specific drillpipe outside diameters, with each rig maintaining a set of elevators covering the various pipe sizes used in the well; modern automated elevators include hydraulic or pneumatic actuation that allows the rig crew to operate the latching from the driller's console rather than manually from the rig floor, improving operational safety and reducing crew exposure to drilling floor hazards.
Key Takeaways
- Elevator load capacity ratings ensure that the device can safely support the maximum drillstring weights encountered in operations — typical land rig elevators are rated for 150 to 750 short tons (300,000 to 1,500,000 lbs), with deepwater elevators rated for 1,000 to 3,000 short tons; the load capacity must exceed the maximum hookload that the rig can develop, which depends on the well design and the operational scenarios; elevators are typically rated for both static load capacity (when the drillstring is stationary) and dynamic load capacity (during pipe-handling operations with possible shock loading); periodic inspection and load testing of elevators is part of the rig maintenance program, with non-conforming elevators being removed from service or repaired.
- Elevator types include conventional elevators (the basic clamping device described above), top-drive integrated elevators (designed for use with top-drive systems where the elevator is integrated with the top-drive head for combined operations), pulldown elevators (used for casing and tubing operations where the gripping mechanism is different from drillpipe applications), and integrated handling devices (modern automated systems that combine elevator function with pipe-handling automation); the choice of elevator type depends on the specific rig configuration and the planned operations, with most modern rigs maintaining a portfolio of elevators for different applications; major manufacturers including National Oilwell Varco (NOV), DEP McCoy, BVM (Bowen), and various specialty manufacturers provide elevators across the full range of capacities and applications.
- Pipe handling operational sequence using elevators starts with the drillstring stand (typically 90 feet, three drillpipe joints) standing in the rig's mousehole or stored in the fingerboard — the rig floor crew positions the elevator around the upper end of the stand at the rig floor, closes the elevator latches, and connects to the traveling block; the drawworks then raises the elevator and the suspended stand, lifting it off the mousehole or the fingerboard; the stand is positioned over the rotary table or top drive for connection to the active drillstring; the connection is made (typically using the iron roughneck for makeup torque), and the stand becomes part of the active drillstring; the elevator can then be opened (latches released, arms swung apart) and the elevator is moved away from the rotary table area; the entire sequence repeats for the next pipe-handling operation; modern automated rigs perform these sequences with reduced crew involvement through integrated pipe-handling equipment.
- Safety considerations for elevator operations include proper inspection of the elevator before each operational use (checking latch mechanisms, hinge wear, load-bearing surfaces), correct procedure for closing and verifying latch engagement (improper latching is a serious hazard that could allow the suspended pipe to drop), safe positioning of crew members away from the elevator swing path during opening, and proper rigging of the elevator-bail-block connection to prevent unintended release; modern automated elevators include sensors that confirm proper latch engagement before allowing load to be applied, providing additional safety beyond manual visual verification.
- Elevator vs slips distinction reflects the different gripping mechanisms — elevators clamp around the pipe body and rely on the pipe upset (or shoulder) for vertical load support, while slips are tapered wedge-shaped devices that fit between the pipe and the rotary table bushing to grip the pipe through friction; both elevators and slips are used in pipe handling, with each having specific applications: elevators for stand handling during tripping and connection operations, slips for static support of the drillstring at the rotary table during connection makeup or breakout; the rig crew transitions between elevators and slips as part of routine pipe-handling sequences, with specific procedures ensuring that load is properly transferred between the two systems without dropping the pipe.
Fast Facts
Elevators have been part of drilling rig pipe-handling equipment since the early 20th century, with progressive refinement of designs and capacities over decades of operations. Modern elevators are sophisticated load-handling devices with engineered safety features and automated operation capability. The continued routine use of elevators across all drilling operations worldwide demonstrates the durability and operational value of the basic mechanical concept, even as automation has changed how the elevators are operated and integrated with broader rig systems.
What Is an Elevator?
An elevator is one of the basic pipe-handling tools on a drilling rig — a hinged clamping device that grips a drillpipe stand for lifting and lowering through the rig's hoisting system. The simple but operationally critical function of allowing the rig to handle pipe efficiently makes elevators routine equipment on every drilling rig, with capacity ratings sized to match the rig's overall hookload capability and the planned operations. The continuing evolution of pipe-handling technology has integrated elevators with automated systems that reduce crew exposure to drilling floor hazards while maintaining the operational capability the elevators provide.
Synonyms and Related Terminology
An elevator is sometimes called pipe elevator, casing elevator (when sized for casing), or hoisting clamp. Related terms include drillpipe (the tubular handled by elevators), drillstring (the assembly being moved), traveling block (the rig hoisting system that elevators connect to), slips (the alternative gripping device), upset (the pipe shoulder that elevators rely on), iron roughneck (companion automated equipment), top drive (the drilling system that integrates with elevators), pipe handling (the broader operational context), and rig (the broader equipment that includes elevators).
FAQ
How does an elevator differ from slips, and when is each device used during pipe-handling operations?
Elevators and slips serve different purposes in pipe handling. Elevators clamp around the pipe and lift the entire pipe weight through the upset shoulder, supporting the pipe during raising and lowering operations through the rig's hoisting system. Slips are tapered wedge devices that grip the pipe through friction at the rotary table, supporting the pipe statically during connection makeup or breakout when the pipe is not being moved. The two devices are used in coordinated sequences during pipe handling: elevator-supported lifting and lowering during stand handling, slip-supported static support during connection operations. Proper transition between elevator support and slip support is a critical pipe-handling skill, with established procedures ensuring that load is always properly supported by one device or the other (never neither, never both with conflicting load paths). Modern automated rigs perform these transitions with rig automation that reduces the manual skill requirements while maintaining operational safety.
Why Elevators Matter in Drilling Operations
Elevators are foundational pipe-handling equipment that enables the routine drilling operations of pipe tripping, connection making, and BHA handling that drilling rigs perform thousands of times per well. The continued routine use of elevators across decades of drilling operations demonstrates the practical importance of this mechanical equipment, with ongoing automation supporting safer and more efficient operations while maintaining the fundamental capability that elevators provide.