Patent ID: 7281592

Claim:
A method for introducing a fluid into a borehole formed in an underground earth formation, in which borehole there is arranged a tubular drill string including a drill bit at its lower end, wherein the drill bit is provided with a passageway between the interior of the drill string above the drill bit and the borehole exterior of the drill bit, and with a removable closure element for selectively closing the passageway in a closing position, and wherein there is further provided a fluid injection tool comprising a tool inlet, and a tool outlet in fluid communication with the tool inlet, which method comprises the steps of: passing the fluid injection tool from a position interior of the drill string to the closure element, and using the fluid injection tool to remove the closure element from the closing position; passing the fluid injection tool to a landing position where the tool outlet has passed through the passageway and where the tool inlet resides inside the drill string in fluid communication with the interior of the drill string; and introducing the fluid from the interior of the drill string into the borehole, wherein the fluid is received by the tool inlet and introduced into the borehole through the tool outlet.