What does HDD mean in drilling?
Horizontal Directional Drilling
Horizontal Directional Drilling (HDD) is a construction technique whereby a tunnel is drilled under a waterway or other designated area, and a pipeline or other utility is pulled through the drilled underground tunnel.
What is a reamer HDD?
Back reamers are used in Horizontal Directional Drilling (HDD) operations primarily for enlarging the pilot bore to accommodate the carrier pipe. The purpose of the reamer is to enlarge the hole. It make take multiple reaming passes before the desired hole diameter is achieved.
Is there money in directional drilling?
If you are more likely to trade directional drills on a regular basis, the residual values at the end of some lease/purchase agreements can be 3 to 5 percent above market value, say Evans and Erger. Market value, based on recent used equipment sales, can be as high as 75 to 85 percent after the first year of operation.
Can you directional bore through rock?
In the past, the presence of rock formations prevented the use of horizontal directional drilling (HDD) for most underground utility construction. As technology has advanced, midsize drilling equipment now has the capability of effectively drilling and steering in rock.
How is HDD done?
Horizontal Directional Drilling (HDD) is a method of installing underground pipelines, cables and service conduit through trenchless methods. It involves the use of a directional drilling machine, and associated attachments, to accurately drill along the chosen bore path and back ream the required pipe.
What is reaming in drilling?
1. vb. [Drilling] To enlarge a wellbore. Reaming may be necessary for several reasons. Perhaps the most common reason for reaming a section of a hole is that the hole was not drilled as large as it should have been at the outset.
Is directional boring profitable?
And in 2017, after years of carving out a profitable niche by focusing on small- to medium-size directional-drilling projects, the company — based in Merced, California — reached nearly $9 million in sales. Moreover, it now employs 27 people and owns a fleet of equipment worth approximately $3.5 million.
How do you bore through limestone?
- Cover the area you want to drill with a piece of duct tape or masking tape. This will help the drill to stay put while creating a hole in the limestone.
- Fill your spray bottle with water.
- Have an assistant stand next to you with the spray bottle full of water.
- Drill into the limestone, using light pressure.
How do you bore through rocks?
Squeeze the trigger of the drill slowly at first. Gain speed as you apply more downward pressure. Allow the tip of the drill bit to penetrate the surface of the rock. Apply more pressure, increase the speed of the drill, keep the bit perfectly straight and drill into the rock until the desired depth is reached.