Cementing Stage Collar with Dissolvable elements

Abstract

A cementing stage collar and a method. The cementing stage collar may include dissolvable parts.

We claim: 
     
         1 . A cementing stage collar, comprising:
 a body that comprises a flow port;   a group of sleeves that comprises at least one sleeve; wherein the group of sleeves comprises exit ports; wherein the group of sleeves is configured to move within the body thereby selectively blocking the flow port and selectively exposing the flow port to an interior of the cementing stage collar; wherein at least one sleeve is dissolvable; and   a first closing element that is configured to receive a sealing element and to seal the cementing stage collar; wherein the first closing element is dissolvable.   
     
     
         2 . The cementing stage collar according to  claim 1  wherein the first closing element is a closing seat. 
     
     
         3 . The cementing stage collar according to  claim 2 , wherein the closing seat comprises a removable and non-solvable cover that covers a dissolvable portion of the closing seat. 
     
     
         4 . The cementing stage collar according to  claim 1  wherein at least a part of the group of sleeves are dissolvable. 
     
     
         5 . The cementing stage collar according to  claim 1 , comprising a stopper that is configured to seal a through port of the group of sleeves thereby preventing fluid to exit downstream of the cementing stage collar when the flow port is exposed to the interior of the cementing stage collar. 
     
     
         6 . The cementing stage collar according to  claim 5 , wherein the stopper is dissolvable. 
     
     
         7 . The cementing stage collar according to  claim 1 , wherein the group of sleeves comprises an opening sleeve and a closing sleeve. 
     
     
         8 . The cementing stage collar according to  claim 7 , wherein the opening sleeve comprises a removable non-solvable cover that covers a dissolvable portion of the opening sleeve. 
     
     
         9 . The cementing stage collar according to  claim 7  wherein the closing sleeve is configured to selectively block the flow port; and wherein the opening sleeve is configured to electively expose the flow port to an interior of the opening sleeve. 
     
     
         10 . A method for cementing an annulus, the method comprising:
 feeding cement to an interior of a cementing stage collar;   outputting the cement from a flow port of a body of the cementing stage collar to the annulus while preventing the cement from propagating downstream to the cementing stage collar;   sending a sealing element to a first closing element of the cementing stage collar;
 forming a seal by receiving, by the first closing element, the sealing element; wherein the first closing element is dissolvable; and 
   dissolving parts of the cementing stage collar; wherein the parts comprises the first closing element, thereby opening a downstream fluid path that passes through the cementing stage collar.