Cable tools are used to drill holes for which purposes?

Cable tools are used to drill holes for which purposes?

• A. measure groundwater table
• B. test soil permeability
• C. core rock samples
• D. drill holes for explosive charge placement and water wells

Answer: (D)

Cable tool drilling is a traditional percussion method that uses a heavy drill bit raised and dropped on the rock to break it, bringing cuttings to the surface. This approach is especially well suited for creating deeper holes through hard formations, which is exactly what you need when you’re placing explosive charges in blast holes or constructing water wells. The method is robust for drilling large-diameter holes where fluid circulation isn’t the primary concern, making it a common choice for these two applications. It’s not typically used to directly measure groundwater levels or test soil permeability, tasks that come after the hole is made using separate instruments and tests. Also, cable tools usually produce rock cuttings rather than intact cores, so obtaining continuous core samples isn’t the standard goal with this technique.

Cable tool drilling is a traditional percussion method that uses a heavy drill bit raised and dropped on the rock to break it, bringing cuttings to the surface. This approach is especially well suited for creating deeper holes through hard formations, which is exactly what you need when you’re placing explosive charges in blast holes or constructing water wells. The method is robust for drilling large-diameter holes where fluid circulation isn’t the primary concern, making it a common choice for these two applications. It’s not typically used to directly measure groundwater levels or test soil permeability, tasks that come after the hole is made using separate instruments and tests. Also, cable tools usually produce rock cuttings rather than intact cores, so obtaining continuous core samples isn’t the standard goal with this technique.