oil drilling An oil well is a drillhole boring in Earth that is designed to bring petroleum oil hydrocarbons to the surface. Usually some natural gas is released as associated petroleum gas along with the oil. A well that is designed to produce only gas may ...

and

borehole mining Borehole Mining (BHM) is a remote operated method of extraction (mining) of mineral resources through boreholes based on in-situ conversion of ores into a mobile form (slurry) by means of high pressure water jetting ( hydraulicking). This proce ...

, a casing shoe or guide shoe is a bull-nose shaped device which is attached to the bottom of the

casing string In drilling technology, casing string is a long section of connected oilfield pipe that is lowered into a wellbore and cemented. The purpose of the casing pipe is as follows: * prevent the collapse of the borehole * prevent formation fluids from ...

. A

casing hanger In petroleum production, the casing hanger is that portion of a wellhead assembly which provides support for the casing string when it is lowered into the wellbore. It serves to ensure that the casing is properly located. When the casing string has ...

, which allows the casing to be suspended from the wellhead, is attached to the top of the casing.

References

Drilling technology {{engineering-stub