Directional Drilling Services

Blackmax mudmotors

NOV Blackmax motors

Transmark eds purchased its first batch of Blackmax mudmotors from NQL in 2004. The Blackmax design utilises the industry's best technology in sealed bearing assemblies, adjustable housings, and power sections. We own Blackmax motors, ranging from 6 3/4" to 11 1/4" diameter.

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. All motors have an optional near bit (sleeve) stabiliser.

Bearing Housing 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 maximised. 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 steering.

The eccentric motion of the rotor is converted into 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.

Stabilisation
Motors are available with a threaded stabiliser on the bearing assembly immediately above the output shaft. Stabilisers are straight bladed IB sleeves. This stabiliser along with the integral wear pad at the bend of the adjustable housing provides the full range of stabilisation required for directional and kick-off work.