| 摘要 |
The invention relates to a drilling system comprising a drilling tool, means for driving the tool, and a device for controlling the force exerted on the tool. The said control device comprises at least one reservoir 2 rigidly connected to the drilling tool and arranged to contain water in its lower part and air in its upper part, and means 5, 12 for varying the quantity of water contained in the said reservoir. <IMAGE>
|
