Flexible dynamic riser for subsea well intervention

Abstract

A flexible dynamic riser comprising: a riser; a coil tubing disposed within the riser, wherein the riser and the coil tubing define an annulus; and a packing material disposed within the annulus.

1 . A flexible dynamic riser comprising:
 a riser;   a coil tubing disposed within the riser, wherein the riser and the coil tubing define an annulus; and   a packing material disposed within the annulus.   
     
     
         2 . The flexible dynamic riser of  claim 1 , wherein the riser comprises a reinforced composite riser. 
     
     
         3 . The flexible dynamic riser of  claim 1 , wherein the riser has an inner diameter in the range of from 0.5 inches to 6.5 inches. 
     
     
         4 . The flexible dynamic riser of  claim 1 , wherein the riser comprises a liner. 
     
     
         5 . The flexible dynamic riser of  claim 1 , wherein the packing material is a viscous fluid. 
     
     
         6 . The flexible dynamic riser of  claim 1 , wherein the packing material is grease. 
     
     
         7 . The flexible dynamic riser of  claim 1 , wherein the flexible dynamic riser further comprises one or more buoyancy modules. 
     
     
         8 . The flexible dynamic riser of  claim 7 , wherein the buoyancy modules are attached to the riser in a configuration that enables the flexible dynamic riser to form one or more coils. 
     
     
         9 . The flexible dynamic riser of  claim 1 , wherein the flexible dynamic riser further comprises one or more packing glands. 
     
     
         10 . A riser system comprising:
 a flexible dynamic riser, wherein the flexible dynamic riser comprises a riser, a coil tubing disposed within the riser, wherein the riser and the coil tubing define an annulus, and a packing material disposed within the annulus.   
     
     
         11 . The riser system of  claim 10 , wherein the flexible dynamic rise comprises the flexible dynamic riser. 
     
     
         12 . The riser system of  claim 10  or  11 , further comprising a vessel and a wellhead, wherein the flexible dynamic riser is connected to the vessel and the wellhead. 
     
     
         13 . The riser system of  claim 10 , wherein the flexible dynamic riser is deployed in a coil configuration. 
     
     
         14 . The riser system of  claim 10 , wherein the flexible dynamic riser comprises three coil portions. 
     
     
         15 . The riser system of  claim 10 , wherein the flexible dynamic riser further comprises a bottom-hole assembly. 
     
     
         16 . A method comprising:
 providing a flexible dynamic riser, wherein the flexible dynamic riser comprises a riser, a coil tubing disposed within the riser, wherein the riser and the coil tubing define an annulus, and a packing material disposed within the annulus and   deploying the flexible dynamic riser.   
     
     
         17 . The method of  claim 16 , wherein the flexible dynamic risers comprises the flexible dynamic riser 
     
     
         18 . The method of  claim 16 , wherein deploying the flexible dynamic riser comprises attaching the flexible dynamic riser to a subsea well head. 
     
     
         19 . The method of  claim 16 , wherein deploying the flexible dynamic riser comprises deploying the flexible dynamic riser in a coil configuration. 
     
     
         20 . The method of  claim 16 , further comprising performing a subsea well intervention with the coil tubing.