| 摘要 |
A method to be used when performing drilling in a well bore, comprising: - positioning in the well bore a drill string comprising at least two pipe conduits, an upper end and a lower end comprising a drilling tool, thereby forming an outer annulus between the well bore wall and the drill string; - drilling a well bore section comprising at least one u-shaped section; - feeding a first fluid with a first density into the outer annulus above the u-shaped section, - providing a second fluid with a second density within the drill string and around the tool; wherein the first density is larger than the second density is disclosed. A device for performing the method is also described. |
