WITSML - Operations Mud Volume Component Schema Total volume of mud at start of report interval (including pits and hole). Volume of mud dumped. Volume of mud received from mud warehouse. Volume of mud returned to mud warehouse. Mud losses detailed breakdown between Surface and Down Hole. Volume of mud built. Volume of mud contained within active string. Volume of mud contained in casing annulus. Volume of mud contained in open hole annulus. Volume of mud contained in riser section annulus. Total volume of mud at the end of the report interval (including pits and hole).