| 摘要 |
<p>DRIFTING SYSTEM Disclosed is a drifting system (300) comprising a drifting element (100) having a wall (114) defining a through flow passage (102) extending in an axial direction (104) of the drifting element and a catcher sub having a through hole. In accordance with embodiment of the herein disclosed subject matter the catcher sub has a seat for receiving the drifting element (100) in the through hole. The through flow passage (102) of the drifting element (100) has a first cross section of flow (106) in a first axial region (108) of the drifting element (100) and has a second, smaller cross section of flow (110) in a second axial region (112) of the drifting element (100) located downstream the first axial region (108). Further, the wall (114) of the drifting element (100) has a lateral outlet (116) extending from the through flow passage (102) in the second axial region (112) and/or from the through flow passage (102) at a location upstream the second axial region (112) through the wall. 128-, --- 302 -- 204 102-- 122 "-304 1-l23 208 -- 126 14/-306 ; -31 0 Fig. 5</p> |
