| 摘要 |
An injection head includes an upper inlet pipe (12) for receiving fluid from a set of tubular rods which can be mounted above the head, at least a first pipe (13) having a curved intermediate portion (14) which connects the upper inlet pipe (12) to at least one lateral injection nozzle (11), at least a second pipe (15) for conveying a fluid from the inlet pipe (12) to a lower outlet pipe (17) which can be connected to a drilling tool. The injection head also has valve (20-23) which can be actuated to cut off the flow of the fluid towards the lower outlet pipe (17). The valve is located in a position downstream of the upper inlet pipe (12) and above, or upstream of, the lateral nozzles (11) and the second pipes (15). |
