Kärnborrhål

Kärnborrhål, also known as core holes, are cylindrical samples of rock or soil obtained using a core drill. This specialized drilling technique involves a hollow drill bit that cuts a circular groove, extracting a solid cylinder of material without pulverizing it. The extracted core preserves the geological stratigraphy and structural features of the subsurface, making it invaluable for scientific and industrial analysis.

The process of creating a kärnborrhål begins with setting up the core drilling rig. The drill bit, often equipped with diamond or carbide tips, is rotated and pressed into the ground. Water or drilling fluid is typically used to cool the bit, lubricate the process, and flush away cuttings. As the bit penetrates the subsurface, it cuts a cylindrical core which is then brought to the surface and collected in sections.

Kärnborrhål are fundamental in various fields. In geology and geophysics, they provide direct evidence of rock types, mineral composition, age, and past environmental conditions, aiding in understanding Earth's history and resource potential. The oil and gas industry relies on core samples to assess reservoir quality, permeability, and hydrocarbon content. Civil engineering and geotechnical investigations use kärnborrhål to determine soil and rock properties for foundation design, tunnel construction, and dam stability assessments. Environmental studies utilize them to analyze groundwater contamination and soil remediation needs. The integrity of the extracted core allows for detailed laboratory testing and interpretation, forming the basis of crucial decision-making.