Drifting System

摘要

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.

主权项

1. A drifting system comprising:
a drifting element having a wall defining a through flow passage extending in an axial direction of the drifting element; and a catcher sub having a through hole; the catcher sub having a seat for receiving the drifting element in the through hole; the through flow passage having a first cross section of flow in a first axial region of the drifting element; the through flow passage having a second cross section of flow in a second axial region of the drifting element; the first axial region being located upstream the second axial region; the second cross section of flow being smaller than the first cross section of flow; and the wall of the drifting element having a lateral outlet extending from the through flow passage in the second axial region and/or from the through flow passage at a location upstream the second axial region through the wall.