Stress reduced cement shoe or collar body

Abstract

A method and apparatus for cementing an annulus wellbore is described herein. The apparatus includes an internally radiused portion of a sleeve adapted for increasing the compressive strength of a compound for securing a valve in the sleeve. The internally radiused portion prevents the apparatus from leaking during operation. The apparatus is manufactured using one pass of a milling tool. The apparatus is run into a wellbore. A cementing operation in performed past the apparatus. The apparatus then prevents the cement from entering a downhole tubular.

1 . An apparatus for installation in a wellbore, comprising:
 a sleeve having an internal profiled portion, wherein the internal profiled portion includes:
 a first radiused portion culminating in a first minimum radius toward an exterior of the sleeve; and 
 a second radiused portion culminating in a second minimum radius toward an interior of the sleeve; 
   a bore located in the interior of the sleeve; and   a compound for coupling a component to the sleeve wherein the first minimum radius and the second minimum radius are configured to reduce stress risers in the compound.   
   
   
       2 . The apparatus of  claim 1 , wherein the component is a valve. 
   
   
       3 . The apparatus of  claim 1 , wherein the transition from the first minimum radius to the second minimum radius is accomplished by a continually changing radius. 
   
   
       4 . The apparatus of  claim 1 , wherein the first minimum radius is larger than the second minimum radius. 
   
   
       5 . The apparatus of  claim 4 , wherein the ratio between the first minimum radius and the second minimum radius is 2:1. 
   
   
       6 . The apparatus of  claim 1 , wherein the first minimum radius is smaller than the second minimum radius. 
   
   
       7 . The apparatus of  claim 1 , wherein the first minimum radius is the same as the second minimum radius. 
   
   
       8 . The apparatus of  claim 1 , wherein the internal profiled portion is undulated. 
   
   
       9 . The apparatus of  claim 1 , wherein the first minimum radius and the second minimum radius are larger than ⅛″. 
   
   
       10 . The apparatus of  claim 2 , wherein the valve is a one-way valve coupled to the bore. 
   
   
       11 . The apparatus of  claim 1 , wherein the internal profiled portion forms a sinusoidal wave. 
   
   
       12 . The apparatus of  claim 1 , wherein the internal profiled portion forms a spiral pattern. 
   
   
       13 . The apparatus of  claim 1 , wherein the cementing assembly is a float shoe. 
   
   
       14 . The apparatus of  claim 1 , wherein the cementing assembly is a float collar. 
   
   
       15 . The apparatus of  claim 1 , further comprising a box end connection for connecting the cementing assembly to a casing string. 
   
   
       16 . The apparatus of  claim 15 , further comprising a pin end connection for connecting the assembly to a bottom hole assembly. 
   
   
       17 . The apparatus of  claim 1 , wherein a tangent point between the first radiused portion and the second radiused portion is located at a distance of ⅓ the depth between the culminating of the first minimum radius and the culminating in the second minimum radius. 
   
   
       18 . The apparatus of  claim 1 , wherein the internal profiled portion extends circumferentially around an interior wall of the sleeve. 
   
   
       19 . A method for manufacturing a cementing assembly, comprising:
 providing a sleeve;   running a tool into the interior of the sleeve;   forming an undulated internal profile in the sleeve; and   fixing a component to the interior of the sleeve using a compound.   
   
   
       20 . The method of  claim 19 , wherein the compound is a cement. 
   
   
       21 . The method of  claim 19 , wherein the tool is a cutting tool. 
   
   
       22 . The method of  claim 21 , wherein forming the undulated internal profile in the sleeve comprises cutting the interior of the sleeve with the cutting tool. 
   
   
       23 . The method of  claim 22 , wherein cutting the interior of the sleeve is accomplished with the cutting tool entering the sleeve from only one end of the sleeve. 
   
   
       24 . The method of  claim 23 , wherein the cutting is accomplished in only one pass of the cutting tool in one axial direction. 
   
   
       25 . The method of  claim 23 , wherein the cutting is accomplished in multiple passes. 
   
   
       26 . The method of  claim 25 , wherein the multiple passes are in only one axial direction. 
   
   
       27 . The method of  claim 19 , wherein the undulated internal profile in the sleeve is formed circumferentially around the interior of the sleeve. 
   
   
       28 . An apparatus, comprising:
 a tubular body defining a longitudinal axis, an internal wall surface and an external wall surface;   a profile in the internal wall surface, including a concave portion defined by a first radius transitioning into a convex portion defined by a second radius; and   a bonding compound in contact with the profile, wherein the profile is configured to substantially minimize stress within the compound upon the application of an axial shear load to the compound.   
   
   
       29 . The apparatus of  claim 28 , wherein the profile extends circumferentially around the internal wall surface of the tubular body. 
   
   
       30 . The apparatus of  claim 28 , further comprising a component coupled to the compound. 
   
   
       31 . The apparatus of  claim 30 , wherein the component is a valve. 
   
   
       32 . An apparatus, comprising:
 a tubular body defining a longitudinal axis, an internal wall surface and an external wall surface;   a profile in the external wall surface, including a concave portion defined by a first radius transitioning into a convex portion defined by a second radius; and   a bonding compound in contact with the profile, wherein the profile is configured to substantially minimize stress within the compound upon the application of an axial shear load to the compound.   
   
   
       33 . The apparatus of  claim 32 , wherein the tubular body is a casing and the compound is a cement. 
   
   
       34 . The apparatus of  claim 33 , wherein the profile extends circumferentially around the external wall surface of the tubular body.