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How Do Custom-Built BHAs Improve Drilling Performance?

  • Writer: Kate Rocha
    Kate Rocha
  • Aug 12
  • 2 min read

Updated: Sep 11

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When it comes to drilling performance, every piece of the Bottom Hole Assembly (BHA) plays a role. The right components can mean smoother drilling, fewer trips, and better control in the hole—while the wrong ones can slow you down and drive up costs.


At Commander Downhole Technologies, we don’t supply complete BHAs, but we do provide critical components—available for rental or custom manufacturing—that integrate seamlessly into your existing BHA build. From proven lower ends to high-quality sub assemblies, our tools are built for reliability in the toughest drilling environments.


What is a BHA?


A Bottom Hole Assembly is the section of the drill string between the drill pipe and the bit.

Depending on the job, it may include:

  • Complete motor (power section + lower end)

  • Stabilizers

  • Jars

  • Shock subs

  • Subs and collars

  • Non-magnetic components for directional accuracy


Our role is to ensure that the pieces we provide—whether manufactured to spec or pulled from our maintained rental fleet—fit perfectly into your BHA so you can hit performance targets without delays.


Commander’s BHA Rental Components


We rent a wide selection of BHA components, all inspected and serviced before deployment:

  • Drilling Stabilizers – Standard and non-magnetic, for hole stability and reduced vibration.

  • Sub Assemblies – High-torque connections to fit your BHA design.

  • Jars – For freeing stuck drill strings.

  • String Mills – For cleaning and conditioning the wellbore.

  • Shock Subs – To absorb vibration and protect sensitive tools.

  • Filter Subs – Standard and non-magnetic, to keep solids out of the motor and MWD tools.

  • Ditch Magnets – For capturing metal debris from the drilling fluid.

  • Non-Mag Collars – For accurate directional measurements without magnetic interference.

  • Pup Joints – Short sections of pipe for precise BHA spacing.

  • Double Bore Float Subs – To control fluid flow and prevent backflow during drilling.


Lower Ends and Motor Parts for Your BHA


In addition to rentals, we manufacture and supply NightHawk lower ends in multiple transmission styles and sizes. We also provide motor parts—including bearings, rotor catches, transmissions, flow diverters, and fixed bends—for both current and legacy designs like NightHawk, Tercel, and Rubicon.


This means you can maintain or upgrade your motor without replacing the full unit.


Why Component Quality Matters


Every BHA is only as strong as its weakest link. High-quality components:

  • Reduce the risk of tool failure in the hole.

  • Maintain torque and directional control.

  • Extend the run life of other downhole equipment.


Commander maintains strict inspection and service standards for all rental tools and manufactures parts to original engineering specifications.


The Bottom Line


You don’t need a brand-new BHA to improve drilling performance—sometimes you just need the right pieces. Commander Downhole Technologies provides the lower ends, motor parts, and rental BHA components that keep your drilling program moving forward.


Need to rent BHA tools or order custom-built parts? Contact Commander today to check inventory and discuss your project needs. build and see how the right assembly can make all the difference in drilling performance.

 
 
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