Section milling, under reaming and setting an inflatable plug in one run

Abstract

A work string and a method of performing an operation in a borehole. The work string includes a milling section for milling a borehole and a packer section that includes a packer and a cover that protects the packer from the borehole. A section of the borehole is milled with the milling section. The packer is moved axially from under the cover to expose the packer to the borehole. The packer is expanded.

What is claimed is: 
     
         1 . A method of performing an operation in a borehole, comprising:
 conveying a work string into the borehole, the work string including a milling section and a packer section, wherein the packer section includes a packer and a cover that protects the packer from the borehole;   milling a section of the borehole with the milling section;   moving the packer axially from under the cover to expose the packer to the borehole; and   expanding the packer.   
     
     
         2 . The method of  claim 1 , wherein milling the borehole further comprises rotating the work string. 
     
     
         3 . The method of  claim 1 , wherein the milling section further comprises an underreamer, the method further comprising expanding the borehole with the underreamer with the packer under the cover. 
     
     
         4 . The method of  claim 1 , further comprising moving the packer axially via at least one of: (i) activating a hydraulic pump; (ii) dropping a ball through the work string; and (iii) a signal from a battery-operated timing device. 
     
     
         5 . The method of  claim 1 , wherein the packer is disposed on a telescoping sub and moving the packer further comprises moving the telescoping sub. 
     
     
         6 . The method of  claim 1 , further comprising milling the borehole and inflating the packer in a same run. 
     
     
         7 . The method of  claim 1 , wherein the work string further comprises a bottomhole assembly and the packer is disposed on the bottomhole assembly. 
     
     
         8 . The method of  claim 1 , wherein the cover is one of: (i) a sleeve; and (ii) a shroud. 
     
     
         9 . A work string, comprising:
 a milling section for milling within a borehole; and   a packer section including a packer and a cover that protects the packer from the borehole, wherein the packer is configured to move axially from under the cover and expand within the borehole.   
     
     
         10 . The work string of  claim 9 , further comprising a rotary table for rotating the work string for milling withing the borehole. 
     
     
         11 . The work string of  claim 9 , wherein the milling section further comprises a mill for milling the borehole and an underreamer for expanding a section of the borehole with the packer under the cover. 
     
     
         12 . The work string of  claim 9 , further comprising a device for moving the packer axially, wherein the device is one of: (i) hydraulic pump; and (ii) a ball seat. 
     
     
         13 . The work string of  claim 9 , further comprising a telescoping sub that moves axially, wherein the packer is disposed on the telescoping sub. 
     
     
         14 . The work string of  claim 9 , wherein the work string further comprises a bottomhole assembly and the packer is disposed on the bottomhole assembly. 
     
     
         15 . The work string of  claim 9 , wherein the packer is one of: (i) an inflatable packer; and (iii) a high expansion element packer.