Extreme Temperature Retrievable Isolation Packer System

Abstract

An isolation packer comprises an expandable sealing element, the outer diameter of the sealing element in a relaxed state is larger than the outer diameter in a stretched state. The sealing element comprises at least one hollow annular ring. In order to set the isolation packer into a casing of wellbore, a setting tool stretches the sealing element of the isolation packer prior to run-in-hole, moving the isolation packer down to a depth of a casing, utilizing the setting tool to relax the sealing element and then separating the setting tool from the isolation packer for retrieval of the setting tool.

What is claimed is: 
     
         1 . An isolation packer, comprising:
 a sealing element,   a base which the sealing element mounting on   a compress sleeve stretching and compressing the sealing element,   wherein an outer diameter of the sealing element in a relaxed state is larger than the outer diameter in a stretched state.   
     
     
         2 . The isolation packer of  claim 1 , further comprising a mandrel to actuate the compress sleeve. 
     
     
         3 . The isolation packer of  claim 1 , wherein the sealing element comprises at least one hollow annular ring. 
     
     
         4 . The isolation packer of  claim 3 , wherein the at least one hollow annular ring comprises a hollow inner space encompassed by a wall. 
     
     
         5 . The isolation packer of  claim 4 , wherein a cross-section of the at least one hollow annular ring is a parallelogram. 
     
     
         6 . The isolation packer of  claim 5 , wherein the parallelogram has two u-shaped edges on both corners in a direction perpendicular to the central axis of the sealing element. 
     
     
         7 . The isolation packer of  claim 4 , wherein a limiter is located in the hollow inner space. 
     
     
         8 . The isolation packer of  claim 7 , wherein the limiter comprises two plates having distance therebetween. 
     
     
         9 . The isolation packer of  claim 3 , wherein the sealing element comprises a plurality of hollow annular rings. 
     
     
         10 . The isolation packer of  claim 9 , wherein the hollow annular rings have progressive wall thicknesses. 
     
     
         11 . The isolation packer of  claim 9 , wherein the number of the plurality of hollow annular rings is four. 
     
     
         12 . The isolation packer of  claim 1 , wherein the sealing element has two tabs on each end. 
     
     
         13 . The isolation packer of  claim 4 , wherein the wall comprises a plurality of holes connecting fluid from outside to interior of the sealing element to equalize pressure. 
     
     
         14 . The isolation packer of  claim 1 , wherein the sealing element is made of metal. 
     
     
         15 . The isolation packer of  claim 1 , wherein an inner surface of the compression sleeve has a fishing profile. 
     
     
         16 . The isolation packer of  claim 1 , wherein the sealing element is made of metal. 
     
     
         17 . The isolation packer of  claim 16 , wherein the sealing element is formed by additive manufacturing process. 
     
     
         18 . A method for setting an isolation packer of  claim 1 , comprising:
 providing the isolation packer;   utilizing a setting tool to stretch the sealing element of the isolation packer prior to run-in-hole;   moving the isolation packer down to a depth of a casing,   utilizing the setting tool to relax the sealing element;   separating the setting tool from the isolation packer for retrieval of the setting tool.