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Priority to NL6505032ApriorityCriticalpatent/NL6505032A/xx
Publication of NL6505032ApublicationCriticalpatent/NL6505032A/xx
E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
E02D3/02—Improving by compacting
E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
E02D3/106—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains by forming sand drains containing only loose aggregates
E—FIXED CONSTRUCTIONS
E21—EARTH OR ROCK DRILLING; MINING
E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
E21B7/00—Special methods or apparatus for drilling
E21B7/001—Drilling a non circular hole
E—FIXED CONSTRUCTIONS
E21—EARTH OR ROCK DRILLING; MINING
E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
E21B7/00—Special methods or apparatus for drilling
E21B7/18—Drilling by liquid or gas jets, with or without entrained pellets