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A reamer is a drilling tool used to enlarge an existing borehole to a larger, final diameter. In horizontal directional drilling (HDD), a back-reamer is pulled back through the pilot bore to widen it so the product pipe can be installed. Reamers come in fluted, fly-cutter and rock types matched to ground conditions.

Directional drilling is the technique of drilling a borehole along a planned, controlled angle or curved path instead of straight down. A steerable drill head lets operators reach targets beneath roads, rivers or buildings — making it essential for trenchless utility installation, pipelines and underground crossings.

Core drilling is a method that uses a hollow cylindrical bit and core barrel to cut and recover an intact, cylindrical sample (the “core”) of rock or soil — rather than grinding it into cuttings. It is the standard for mineral exploration and geotechnical investigation, where an undisturbed sample is needed for analysis.

HDD installs underground pipes and cables without digging a trench, in three steps: (1) a steerable drill head bores a pilot hole along a pre-planned path; (2) a reamer is pulled back to enlarge the bore to the required diameter; (3) the product pipe is pulled through the enlarged hole. Drilling fluid cools the tooling, removes cuttings and stabilises the borehole throughout.

In wireline core drilling, the inner tube holding the rock core is hoisted to the surface by a wireline (cable) running down through the drill rods — without tripping out the entire drill string. This dramatically speeds up core recovery in deep holes and is why wireline core barrels (BQ, NQ, HQ, PQ) are the industry standard for deep exploration.