National Oilwell Varco Downhole manufactures Griffith®, Bowen® and BlackMax drilling jars suited for all drilling operations. Product offerings include Double-Acting Hydraulic/Mechanical jars, Hydraulic/Mechanical jars, and PowerStroke Hydraulic Up/Down jars....

Intensifiers are designed to ensure maximum jarring efficiency in directional or crooked holes where wall drag is a problem, or in shallow holes where pipe stretch is insufficient. ...

National Oilwell Varco manufactures Griffith® and BlackMax Shock Tools. Shock tools are designed to isolate the drill string from axial deflections produced by the bit during drilling operations and ...

Bumper Subs, often referred to as a slack joint, may be used as motion compensators on floating rigs, or to allow controlled feed-off on delicate fishing or milling operations....

Drill collars, when used without stabilizers, tend to buckle and cause unwanted deviation. A typical bottom hole assembly (BHA) will include one or two stabilizers placed in the drillstring to increa...

NOV Downhole Reamers and Wipers reduce torque and drag, increase the rate of penetration, and improve operational efficiency. ...

Designed, engineered and built to meet the needs of today's more complex extended reach and horizontal wells, the Hydrastab has quickly established itself as the best vgs tool in the market place....

Safety Valves are designed for use during well servicing and workover operations. A Safety Valve is a full opening valve that provides positive pressure control of the fluids in the drill string and ...

Check Valves are designed to control or prevent a backflow condition when the kelly or top drive is diconnected from the drill pipe, essentially a one-way check valve....

Drill Collars are one of the key components in the BHA. They provide the weight on bit to drill the well and keep the drillpipe in tension to prevent buckling....

NOV Downhole offers a variety of drillstring components to support your drilling operation. Products include lift subs for tool handling, bit and crossover subs for making up tools with different con...

The Agitator Tool gently oscillates the Bottom Hole Assembly to significantly improve weight transfer and reduce friction. This improves weight transfer and reduces stick-slip in all modes of drillin...