Mouse Hole : A hole in the rig floor designed to hold a joint of pipe. The rat hole (a term also used for the borehole below the pay zone) holds the Kelly when it has to be disconnected
George E. King Engineering, 5000 Oilfield Terms: A Glossary of Petroleum Engineering Terms, Abbreviations and Acronyms, US 2010. http://gekengineering.com/Downloads/Free_Downloads /Glossary_of_Petroleum_Engineering_Terms_25_August _2010.pdf, (Oil - Amer) {593}