| 摘要 |
The device comprises the installation of a sealing piston E in a well D just above the source F; the assembly E is held in position for the injection of the pressurised liquid for unplugging the source F by a water brake with two jaws G. The device according to the invention is characterised by a well D into which is lowered a piston E of diameter less than the well, this piston E being stopped above the source F. The operation of compressing the piston E using a thrust cylinder H with two outlets holds the piston E in sealed contact with the walls of the well. So that the piston does not reascend when there is an injection of liquid under pressure for unplugging the source F, a brake G with two jaws operating hydraulically is installed, the latter being fixed to the tube Ref. 13 of the piston E. After locking against the walls of the well, the brake G becomes joined to the latter and thus prevents the sealing piston from reascending when there is an injection of liquid under pressure for unplugging the source. <IMAGE>
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