drillhole
A drillhole, often written drill hole, is a hole created by drilling into the subsurface with a drill rig. Drillholes are used for geological exploration, mineral or hydrocarbon resource delineation, groundwater assessment, environmental monitoring, and construction or dewatering applications.
There are several types of drillholes. Exploration drillholes are intended to sample and characterize subsurface rocks.
Equipment and procedures vary by purpose. A drill rig, drill string, and bits are standard, with core
Data and interpretation rely on collar surveys, depth records, and downhole measurements (inclination and azimuth). Core