National Oilwell Varco, the world's largest independent supplier of motors, offers the most versatile array of downhole motors available for straight hole, directional, slim hole and coiled tubing drilling. National Oilwell Varco provides drilling motors and their component parts for sale, lease, or rent to clients worldwide. In 1997, National Oilwell Varco acquired Dreco Energy Services Ltd. and inherited the Trudril and Vector brand drilling motors. In 2007, National Oilwell Varco acquired NQL and inherited the BlackMax and Prescott brands. All National Oilwell Varco drilling motors utilize the industry's best technology in sealed bearing and mud lube assemblies, adjustable housings, and power sections. We combine that technology with inventories and worldwide service to create a powerful source for your drilling motor requirements.

National Oilwell Varco designs and manufactures bearing assemblies, driveshafts, adjustable housings and Monoflo power sections that are used by most major directional drilling companies in their own motor fleets worldwide. We also provide innovative solutions to a variety of drilling motor problems for a full range of applications including short and medium radius work and performance drilling in standard and elevated temperatures.

As part of its technology package, National Oilwell Varco engineers will assist a customer to fit National Oilwell Varco components into client-owned assemblies by designing with connections, lengths and diameters that will ensure compatibility.

Features and Benefits:

Versatility:
National Oilwell Varco offers the most versatile array of downhole motors available for straight or directional drilling. Rotary power is produced by a moineau positive displacement progressing cavity mud motor. The mud motor power sections offer a wide range of bit speeds and torques and can be tailored to function in both high bottom-hole temperatures and inverted mud systems. Motors are available with a fixed or an adjustable housing located between the motor and the bearing assembly. The adjustable housing is easily rig adjustable from zero (or straight) to a three-degree bend in 12 increments or a four-degree bend in 18 increments.

Most motors have an optional near bit stabilizer. Concentric or eccentric stabilizers or pads can also be provided to stabilize the top or middle of the motor.

National Oilwell Varco manufactures motors from 1 7/16" to 11 1/4" diameter. National Oilwell Varco offers sales and service support via an international network of facilities.

Sealed Bearing Assembly:
The Sealed Bearing Assemblies are capable of withstanding extreme radial and axial loads. Due to the design and axial capacity of the bearing assembly, it is not necessary to balance bit force against pump-open force.

Bearing assemblies are fully oil bath lubricated, sealed and pressure balanced. Since no drilling fluid flows through the bearing assembly, motor bearing life is extended and bit hydraulics are maximized.

The short length of the bearing assembly keeps the adjustable housing close to the bit and provides better control of the angle build rate and motor steerability.

Mud Lubricated Bearing Assembly:
The Mud Lubricated Bearing Assembly is designed to withstand extreme drilling conditions and high temperatures. This makes it suitable to use with Positive Displacement Power sections or Turbines. The Bearing Assembly features a high precision bi-directional angular contact bearing pack that gives a uniform load distribution and high weight on bit capacity. In addition, this mud lubricated bearing assembly is radially supported over its entire length and can, therefore, tolerate very high side loads.

Gear Reduced Bearing Assembly:
The Gear Reduced (GR) Bearing Assembly is designed to run when high torque and lower rotational speeds are desired. The GR Bearing assembly has the same bearing load capacity as an oil sealed bearing assembly, and it is designed to run with Positive Displacement Power sections or Turbines. This bearing assembly can be used with a high speed power section to get the same torque as multi-lobe power sections, but with a higher efficiency. The GR bearing assembly could also be used with multi-lobe power sections when torque goes beyond the limits of power sections are desired.

Stabilization:
Motors are available with a threaded stabilizer on the bearing assembly immediately above the output shaft. Stabilizers can be either straight blade or spiral blade. This stabilizer along with the integral wear pad at the bend of the adjustable housing provides the full range of stabilization required for directional and kickoff work. For steerable motor assemblies, a concentric or eccentric stabilizer may be installed at the top of the motor and an under-gauge stabilizer on the lower end of the motor. The angle of bend set in the adjustable housing determines the under-gauge diameter of the lower stabilizer.

Output Shaft:
The Output Shaft is larger in diameter than most competitive motors. This extra diameter and strength reduces deflection and stress and allows the motor to be rotated in the hole with reduced likelihood of fatigue induced failures.

Driveshaft and Universal Joints:
The eccentric motion of the rotor is converted to concentric rotation via a driveshaft fitted at each end with sealed and lubricated universal joints. The strength and service life of these joints is greatly increased over that of conventional joints due to the large internal clearances available through the adjustable housing.

Power Section:
Power Sections are available for a wide range of drilling applications. Rotational power is provided by a moineau progressing cavity positive displacement mud motor. These are available in high speed, low torque applications and in multi-lobe configuration for low speed, high torque use.

The problem created by high bottom hole temperatures and invert mud systems may be overcome by modifying standard rotor/stator clearances and by the use of elastomeric compounds that are less susceptible to deterioration in a hydrocarbon medium.

A top sub may be used instead of the dump sub. The string will then fill through the motor (or it may be filled from the surface) and the string will be pulled wet.