It is used to guide the low section of the casing pipe along the wellbore and to protect it from damage during running while mounting oil and gas wells.
String shoe consists of a solid steel casing and a hemispherical concrete nozzle connected to it.
The string shoe can easily be drilled through. It is connected to the pipe by thread OTTM, VAM TOP, “Batress”. Corresponds to international standard АРI RP10F.