Downhole catching device and tool combination

Abstract

A downhole catching device, comprises a flow path; a surface portion defining at least part of a first portion of the flow path; and a second portion of the flow path; wherein the surface portion extends crosswise the second portion of the flow path. A tool combination comprises the downhole catching device and an operating element to be caught by the catching device. A method comprises preventing an elongated operating element from aligning with a portion of a flow path.

1 . A downhole catching device, comprising:
 a flow path;   a surface portion defining at least part of a first portion of the flow path; and   a second portion of the flow path;   wherein the surface portion extends crosswise the second portion of the flow path.   
     
     
         2 . The downhole catching device according to  claim 1 , further comprising a body, the body providing the surface portion. 
     
     
         3 . The downhole catching device according to  claim 2 , wherein the body is a tubular body. 
     
     
         4 . The downhole catching device according to  claim 2 , wherein the body comprises at least one opening to allow fluid to flow between an interior and an exterior of the body. 
     
     
         5 . The downhole catching device according to  claim 2 , further comprising an insert located within the body, wherein the second portion of the flow path is at least partially defined by the insert. 
     
     
         6 . The downhole catching device according to  claim 5 ,
 wherein the body comprises an inner surface;   wherein the insert comprises an outer surface facing the inner surface of the body;   the outer surface of the insert extending parallel to the inner surface of the body; and   the second portion of the flow path being formed by an inner surface portion of the insert;   the inner surface portion of the insert being angled with respect to the outer surface of the insert.   
     
     
         7 . The downhole catching device according to  claim 6 , wherein the surface portion is a part of the inner surface of the body which extends beyond the insert. 
     
     
         8 . The downhole catching device according to  claim 1 ,
 the second portion of the flow path extending in an axial direction and having a clearance diameter;   wherein the surface portion results in an effective clearance diameter that is smaller than the clearance diameter of the second portion when viewed in a direction deviating from the axial direction of the second portion of the flow path.   
     
     
         9 . A tool combination comprising:
 a downhole catching device according to  claim 1 ; and   an operating element to be caught by the catching device.   
     
     
         10 . The tool combination according to  claim 9 , wherein the operating element is at least in part rotationally symmetric with respect to a symmetry axis. 
     
     
         11 . The tool combination according to  claim 10 , wherein the operating element has at least one conical outer surface portion extending about the symmetry axis. 
     
     
         12 . The tool combination according to  claim 9 , wherein
 the operating element is an elongated operating element; and   the second portion of the flow path and the surface portion are arranged so as to prevent the operating element from aligning with the second portion of the flow path to an extent that would allow the operating element to fully enter the second portion of the flow path.   
     
     
         13 . The tool combination according to  claim 9 , wherein the operating element is an operating element of a downhole tool being located upstream the downhole catching device. 
     
     
         14 . A method of operating a downhole catching device, the method comprising:
 preventing an elongated operating element from aligning with a portion of a flow path.