Method and system for cleaning fracture ports

Abstract

A method of stimulating or cleaning a fracture port and the proximate well bore area, includes the steps of inserting a downhole assembly on coiled tubing into a production tubing string comprising a fracture port. The downhole assembly includes a fluid pulse generator and jetting tool which is positioned adjacent the fracture port, and fluid is pumped through the tool to create fluid pressure pulses and jet streams of fluid. The method and apparatus does not require isolating the fracture port to be cleaned with packers or seals.

1 . A system for stimulating or cleaning a fracture port and the proximate wellbore area, comprising an assembly configured to be run on coiled tubing, the assembly comprising a fluid pulse generator and jetting tool, and not comprising an isolation packer or seal. 
     
     
         2 . The system of  claim 1  wherein the fluid pulse generator and jetting tool comprises an elongate tool having a top jet sub, and a bottom jet sub, separated by a pulse generator. 
     
     
         3 . The system of  claim 2  wherein each of the top and bottom jet subs comprises a plurality of jetted openings distributed around the periphery of the top and bottom jet subs. 
     
     
         4 . The system of  claim 3  wherein at least a portion of the jetted openings are angled away from the pulse generator. 
     
     
         5 . The system of  claim 2  further comprising a nose jet cone having a jetted Opening. 
     
     
         6 . The system of  claim 2  further comprising a top reflective focusing chamber positioned between the top jet sub and the pulse generator and a bottom reflective focusing chamber positioned between the bottom jet sub and the pulse generator. 
     
     
         7 . A method of stimulating or cleaning a fracture port and the proximate wellbore area, comprising the steps of inserting a downhole assembly configured to be run on coiled tubing into a production tubing string comprising at least one fracture port, the downhole assembly comprising a fluid pulse generator and jetting tool, positioning the tool adjacent the at least one fracture port, and pumping fluid through the tool to create fluid pressure pulses and jet streams of fluid, wherein said method does not include a step of isolating the fracture port to be cleaned. 
     
     
         8 . The method of  claim 7  wherein the fluid pulse generator and jetting tool comprises an elongate tool having a top jet sub, and a bottom jet sub, separated by a pulse generator. 
     
     
         9 . The method of  claim 8  wherein each of the top and bottom jet subs of the fluid pulse generator and jetting tool comprises a plurality of jetted openings distributed around the periphery of the top and bottom jet subs. 
     
     
         10 . The method of  claim 9  wherein at least a portion of the jetted openings are angled away from the pulse generator. 
     
     
         11 . The method of  claim 8  wherein the fluid pulse generator and jetting tool further comprises a nose jet cone having a jetted opening. 
     
     
         12 . The system of  claim 8  wherein the fluid pulse generator and jetting tool further comprises a top reflective focusing chamber positioned between the top jet sub and the pulse generator and a bottom reflective focusing chamber positioned between the bottom jet sub and the pulse generator. 
     
     
         13 . The method of  claim 7  wherein the production tubing string comprises a horizontal section having a plurality of fracture ports, and the fluid pulse generator and jetting tool is advanced or retracted from fracture port to fracture port along the horizontal section. 
     
     
         14 . The method of  claim 7  wherein the fluid pumped through the tool has a different chemistry as the tool is advanced from fracture port to fracture port, than when it is retracted from fracture port to fracture port. 
     
     
         15 . The method of  claim 14  wherein the fluid pumped comprises an acid, a surfactant, a solvent, or mixtures thereof.