- Drill faster by letting the Hammer do its job
- Install casing more easily in challenging formations
- More effective when drilling under water
- Use larger bits that last longer
- Serves as a water and cuttings diverter
- No risk of breaking off driver shoes
The Holte Casing Driver (CD) or Casing Hammer was designed to be small and compact as well as hard hitting like a Down Hole Hammer (DHH). While the CD cycles fast like a DHH it is able to be designed around a much larger piston since it is above ground, in turn, delivering an extremely powerful impact for driving casing, allowing your DHH to run most efficiently since its energy is not absorbed trying to pull casing along with it.
The Holte Casing Hammer is designed to be used with a DHH (Down The Hole Hammer) and underreamer, and is available in four sizes from an easily portable size for light duty rigs to a heavy duty size for the most extreme well and hole conditions.
When the hole is first started the casing driver sits inactive on top of the casing and acts as a water diverter. When the underreamer advances 1” ahead of the casing the CD anvil closes and the casing driver starts operating. The more the anvil is closed, the harder the casing driver hits. The CD turns on and off automatically and runs only when the casing lags behind the underreamer, causing the anvil to close. There is only 1 1/4” of vertical movement of the CD anvil so the casing will always remain within 3” of the bit.