Boots and Coots firefighters Bud, R., and Mike (C. covered in oil) help Halliburton pump driver (L., has company name covered with tape) connect pipes to "sting" extinguished fire with drilling mud. A "stinger" is a tapered pipe attached to the end of a long steel boom that is controlled by a bulldozer. Drilling mud, under high pressure, is pumped through the stinger into the well, stopping the flow of oil and gas. The Rumaila field is one of Iraq's biggest oil fields with five billion barrels in reserve. Rumaila, Iraq. Rumaila is also spelled Rumeilah.