Downhole Hydraulic Fracturing Tool

Abstract

A downhole tool for injecting fluid in a wellbore intersecting a subterranean formation. The tool can include a housing, a piston assembly moveably received in a chamber in the housing and dividing the chamber into an extension cavity and a retraction cavity, a rod assembly moveable within the housing and including a conduit, a nozzle in fluid communication with the conduit. The tool can release fluid in a cyclical pattern powered by pressurized fluid flowing through the conduit or a power source such as a pump with control lines in fluid communication with the cavities.

What is claimed is: 
     
         1 . A downhole hydraulic fracturing tool for use with a fluid, comprising:
 a housing comprising a chamber,   a rod assembly moveable within the housing and comprising a conduit including a flow path for the fluid,   a piston assembly coupled to the rod assembly and moveable within the chamber, wherein the piston assembly comprises a piston dividing the chamber into an extension cavity and a retraction cavity, and   a nozzle in fluid communication with the conduit and configured to control the flow of the fluid exiting the tool.   
     
     
         2 . The downhole hydraulic fracturing tool of  claim 1 , further comprising:
 a control line in fluid communication with the extension cavity,   an additional control line in fluid communication with the retraction cavity, and   a hydraulic power source in fluid communication with at least one of the control lines.   
     
     
         3 . The downhole hydraulic fracturing tool of  claim 1 , wherein:
 the piston assembly further comprises a valve including an inlet port and two outlet ports, and   the outlet ports include an extension outlet port in fluid communication with the extension cavity and a retraction outlet port in fluid communication with the retraction cavity.   
     
     
         4 . The downhole hydraulic fracturing tool of  claim 3 , wherein the inlet port is in fluid communication with the conduit. 
     
     
         5 . The downhole hydraulic fracturing tool of  claim 3 , wherein the piston assembly further comprises a switch device configured to switch a flow path in the valve between the outlet ports. 
     
     
         6 . The downhole hydraulic fracturing tool of  claim 3 , wherein the piston assembly further comprises a filter in fluid communication with the conduit and the outlet ports of the valve. 
     
     
         7 . The downhole hydraulic fracturing tool of  claim 1 , further comprising a track and the nozzle is moveably coupled to the track. 
     
     
         8 . The downhole hydraulic fracturing tool of  claim 8 , wherein the track is configured to rotate the nozzle along the stroke of the nozzle. 
     
     
         9 . The downhole hydraulic fracturing tool of  claim 1 , wherein:
 the chamber includes an extension drain valve and a retraction drain valve,   the extension drain valve controls the flow of fluid out of the extension cavity, and   the retraction drain valve controls the flow of fluid out of the retraction cavity.   
     
     
         10 . The downhole hydraulic fracturing tool of  claim 9 , wherein:
 the rod assembly includes an extension actuator and a retraction actuator,   the extension actuator is positioned on the rod assembly to open the extension drain valve, and   the retraction actuator is positioned on the rod assembly to open the retraction drain valve.   
     
     
         11 . A method of jetting fluid, comprising:
 flowing fluid through a conduit;   moving a piston dividing a cavity and an additional cavity; and   releasing the fluid through a nozzle in fluid communication with the conduit and coupled to the piston.   
     
     
         12 . The method of  claim 11 , further comprising:
 channeling some of the fluid into the cavity;   venting another fluid from the additional cavity.   
     
     
         13 . The method of  claim 11 , further comprising:
 filling the cavity with another fluid through a control line; and   draining the additional cavity through an additional control line.   
     
     
         14 . The method of  claim 11 , further comprising moving the nozzle according to a stroke signal. 
     
     
         15 . The method of  claim 11 , further comprising rotating the nozzle. 
     
     
         16 . The method of  claim 11 , further comprising closing a drain valve in fluid communication with the cavity. 
     
     
         17 . The method of  claim 11 , wherein the channeling further comprises filtering the some of the fluid. 
     
     
         18 . A jetting system, comprising:
 a carrier; and   a jetting tool in fluid communication with the carrier, comprising:
 a housing comprising a chamber, 
 a rod assembly moveable within the housing and comprising a conduit including a flow path for fluid, wherein the piston assembly comprises a piston dividing the chamber into an extension cavity and a retraction cavity, 
 a piston assembly coupled to the rod assembly and moveable within the chamber, and 
 a nozzle in fluid communication with the conduit. 
   
     
     
         19 . The jetting system of  claim 18 , wherein:
 the piston assembly comprises a valve including an inlet port and two outlet ports, and   the outlet ports include an extension outlet port in fluid communication with the extension cavity and a retraction outlet port in fluid communication with the retraction cavity.   
     
     
         20 . The jetting system of  claim 18 , further comprising:
 a hydraulic power source,   wherein the carrier comprises:
 a control line in fluid communication with the extension cavity, and 
 an additional control line in fluid communication with the retraction cavity, and 
   wherein the hydraulic power source is in fluid communication with at least one of the control lines.