Top 3 factors to consider when selecting the right directional drilling blade for your job

You cannot escape from reading or hearing about horizontal directional drilling when you read or hear about public works projects. Abbreviated as HDD, it is used to install underground pipe when excavating or trenching is not practical. It works by using a surface launched steerable drill bit a pipe is inserted deep beneath the surface without troubling the surrounded landscape. HDD technique is widely used to develop surface utilities like water or sewer.

The choice of blade in directional drilling can make or break your success straight out of the gate. Your blade’s blot pattern is dictated by your drill’s rig that you attach to it, but there are more factors to consider when selecting the perfect blade for your job. Let’s find out those points.

Drilling in Penrith

1. Look at your ground conditions

The directional drilling tools you require are dependent on the type of ground you will be drilling. Directional drilling tools are engineered carefully with specific features to undertake the challenges of varied materials. It’s quite likely that by using the wrong tool you might complete the job but at a cost of your time, equipment and sanity.

  • Hard and compact soil– It is advised that for dense and compact soils, using a tool with a point can help with penetration when the direction is changed. Since you’re applying a forward push without instantaneous rotary cutting action as you turn, using a tool with a STEEP TAPER can help puncturing the soil all through the directional pushes. It is best to use blades with conical carbides, since their pointy teeth are brilliant at fracturing hard materials.
  • Soft ground conditions–In soft ground conditions like sand, clay and dirt, it is best to avoid bits with a substantial taper as they don’t supply enough surface area to enable directional changes of your drill. In soft ground conditions, you require surface area to push against so that you can achieve a controlled change in direction. The force of the ground against top of the blade allows the blade to steer. With the less surface area, it becomes easier to push. But in this case less force is available against which the blade interacts. In such conditions, you need a blade with more surface area or a wider nose.

In non-abrasive conditions like clay, you can escape fewer carbides and less hard facing. Blades that offer less protection will cost less but are likely to wear out faster. Basically, it’s a trade-off, pay more for a longer-lasting blade or replace blades frequently.

2. Consider your pullback

For instances of direct pullback, you should choose a blade that can drill a hole which is slightly bigger than the pipe you are supposed to pull.  Just as in the case of back reaming, your back reamer must measure 1.5 times the diameter of the pipe or cable you’ll be pulling. The same logic is applied on your blade during direct pullback. You should ensure that there are sufficient carbide cutters along your blade’s edges.

3. Efficient utilisation of blade

Remember, if you over use a blade, it may cut fine up front, but the backside of the blade can get weakened. This hidden wear can cost you severely. When the main cutters of the blade worn significantly, or backside of blade is spent, the diameter of blade can become reduced to about the same diameter as of your transmitter’s housing. This simply means transmitter’s housing is likely to see greater wear and tear.

You must ensure that the diameter of blade is significantly wider than transmitter housing. This can protect you from replacing your transmitter housing which is a more expensive tool than blade.


Choosing the perfect blade can protect you from the headache and additional expense of lost time or insufficient equipment. So, if you have any queries about which blade would be perfect for specific Drilling job in Blacktown, contact us to know the best blade for you.