Hydrodynamic, down-hole anchor

Abstract

A method of removably anchoring well tubing in a well bore may include selecting a well having a bore diameter and an anchor positioned therein. The anchor may have a housing defining an anchor diameter and extension members extending therefrom toward the bore diameter. The bore diameter and anchor diameter may be spaced apart a distance defining an annulus therebetween and extending along the well. A tool sized to cut substantially exclusively within the annulus may be selected. The tool may be positioned within the annulus, rotated, and advanced to drive past the housing to remove the extension members between the housing and the bore diameter to free the anchor.

1 . An anchor for anchoring down-hole well tubing, the anchor comprising: 
 a mandrel formed as a tube;    a housing surrounding the mandrel;    a slip assembly urging at least one slip radially away from the mandrel upon relative rotation of the mandrel in a first direction with respect to the housing; and    a trailing fairing secured to the mandrel, the trailing fairing providing a substantially gradual transition from approximately the diameter of the housing at a comparatively upstream location to approximately the diameter of the mandrel at a comparatively downstream location.    
   
   
       2 . The well anchor of  claim 1 , further comprising a leading fairing secured to the mandrel, the leading fairing providing a substantially gradual transition from about the diameter of the housing at a comparatively downstream position to about the diameter of the mandrel at a comparatively upstream position.  
   
   
       3 . The well anchor of  claim 1 , further comprising at least one drag spring connected to the housing.  
   
   
       4 . The well anchor of  claim 1 , further comprising at least one slip protector positioned on the housing for each of the at least one slip.