Standpipe (drilling technique)

Exposed standpipe of a geothermal well in the basement of the SuperC building of the RWTH Aachen

The uppermost pipe string of a pipe tour in the casing of a geological borehole , which forms the mouth of the borehole on the surface, is called standpipe . The length of the standpipe of a borehole depends on the nature of the overburden and the depth of the water table. As a rule, standpipes are between 20 and 200 m long. The diameter of a standpipe depends on the length of the hole and its final diameter at the depth of the borehole.

Before the actual drilling work begins, the standpipe is embedded and embedded in the so-called drilling cellar . The standpipe has the task of stabilizing the borehole in the upper area and, in particular, of protecting it from falling from the loose rock areas and from water ingress when drilling through aquifers . In addition, the standpipe of the bore is a guide and prevents undercutting of the foundation of the rig due to leaking of possible drilling fluid .

Individual evidence

1. ↑ Peter Hatzsch: Deep drilling technology . Enke, Stuttgart 1991, ISBN 3-432-99511-3 , p. 54.