| 摘要 |
<p>A system is described for an active sealing barrier in connection with drilling in water carrying or hydrocarbon carrying wells, comprising two or more active sealing elements (30a, 30b, 30c) arranged in a housing (20) and with a mutual distance apart that is greater than the length of a pipe coupling (11) which makes it possible to have a leak proof pressure barrier when a drill stem (10) of a varying diameter is inserted into or taken out of a well, and also that the system comprises a number of inlet channels (50a, 50b) for injection/evacuation of a pressure medium, arranged to distribute the pressure load between said sealing elements (30a, 30b, 30c).</p> |
