Installing cables in boreholes by an everting liner

Abstract

A borehole is traversed through from an upper end of the borehole to substantially a lower end of the borehole. A cable attached to the everting liner is carried into the borehole. A tether attached to the everting liner is carried into the borehole. The tether is attached to an end of the everting liner that is configured to be at the downhole end of the borehole after traversing the borehole.

1 . A method performed by an everting liner, the method comprising:
 traversing the everting liner through a borehole from an upper end of the borehole to substantially a lower end of the borehole;   carrying a cable attached to the everting liner into the borehole; and   carrying a tether attached to the everting liner into the borehole, the tether attached to an end of the everting liner that is configured to be at the downhole end of the borehole after traversing the borehole.   
     
     
         2 . The method of  claim 1 , further comprising:
 receiving an acoustic coupling medium into the everted liner.   
     
     
         3 . The method of  claim 2 , wherein the acoustic coupling medium comprises cement, sand, bentonite, or water. 
     
     
         4 . The method of  claim 1 , further comprising deforming the cable by an acoustic wave passing through the cable. 
     
     
         5 . The method of  claim 1 , further comprising:
 traversing the tether out of the borehole; and   carrying a cable out of the borehole.   
     
     
         6 . The method of  claim 1 , further comprising receiving a cement cap at an upper end of the liner. 
     
     
         7 . A system comprising:
 an everting liner configured to evert during installation, the everting liner configured to be installed in a borehole;   a central tether attached to an end of the everting liner, the tether configured to retrieve the everting liner after installation, the tether configured to travel through the everting liner during installation; and   a cable configured to be installed into the borehole with both the everting liner and the central tether, the cable configured to detect acoustic waves within the borehole.   
     
     
         8 . The system of  claim 7 , wherein the cable comprises an optical fiber. 
     
     
         9 . The system of  claim 8 , wherein the optical fiber comprises a looped fiber cable, the looped fiber cable comprising a turn-around assembly. 
     
     
         10 . The system of  claim 9 , wherein the turn-around assembly comprises a glass cap defining a space sufficient for a minimum bend radius of the looped fiber cable, the glass cap configured to protect the fiber. 
     
     
         11 . The system of  claim 7 , wherein the cable is attached to the tether. 
     
     
         12 . The system of  claim 7 , wherein the cable is attached to the liner. 
     
     
         13 . The system of  claim 12 , wherein the cable is configured to be between a wall of a borehole and the everted liner once installed. 
     
     
         14 . The system of  claim 12 , wherein the liner is configured to be between a wall of a borehole and the cable once installed. 
     
     
         15 . The system of  claim 12 , wherein the cable is directly attached to the liner with an adhesive. 
     
     
         16 . The system of  claim 12 , wherein the liner comprises a pocket that runs substantially an entire length of the liner, the cable running through the pocket. 
     
     
         17 . The system of  claim 7 , wherein the cable runs substantially an entire length of the borehole. 
     
     
         18 . A system comprising:
 an everting liner configured to evert during installation, the everting liner configured to be installed in a borehole;   a central tether attached to an end of the everting liner, the tether configured to retrieve the everting liner after installation, the tether configured to travel through the everting liner during installation; and   an optical fiber that is attached to and runs a length of the everting liner, the optical fiber configured to be installed into the borehole with both the everting liner and the central tether, the optical fiber being configured to be between a wall of a borehole and the everted liner once installed, the optical fiber configured to detect acoustic waves within the borehole.   
     
     
         19 . The system of  claim 18 , wherein the optical fiber comprises a looped fiber cable, the looped fiber cable comprising a turn-around assembly. 
     
     
         20 . The system of  claim 19 , wherein the turn-around assembly comprises a glass cap defining a space sufficient for a minimum bend radius of the looped fiber cable, the glass cap configured to protect the fiber.