Method and Apparatus for Multi-Zone Stimulation

Abstract

Methods of treating a well bore in a single trip are provided. A tubing string may be inserted into a subterranean formation having a well bore, where the tubing string has a locking device on an end. A workover tool may be positioned in a first zone of the subterranean formation, where the workover tool engages the locking device. One or more perforations may be created or enhanced in a first zone of a subterranean formation using the workover tool, and the tubing string may be positioned in a second zone of the subterranean formation. A fracturing fluid may be introduced into the first zone of the subterranean formation at a rate and pressure sufficient to create or enhance one or more fractures in the subterranean formation. The first zone of the subterranean formation may be isolated from the second zone of the subterranean formation and one or more perforations in the second zone of the subterranean formation may be created or enhanced using the workover tool.

1 . A method of treating a well bore in a single trip, the method comprising:
 inserting a tubing string into a subterranean formation comprising a well bore, wherein the tubing string has a locking device disposed on an end;   positioning a workover tool in a first zone of the subterranean formation, wherein the workover tool engages the locking device;   creating or enhancing one or more perforations in a first zone of a subterranean formation using the workover tool;   positioning the tubing string in a second zone of the subterranean formation;   introducing a fracturing fluid into the first zone of the subterranean formation at a rate and pressure sufficient to create or enhance one or more fractures in the subterranean formation;   isolating the first zone of the subterranean formation from the second zone of the subterranean formation; and   creating or enhancing one or more perforations in the second zone of the subterranean formation using the workover tool.   
   
   
       2 . The method of  claim 1  wherein inserting a tubing string into a well bore comprises using a hydraulic workover unit to introduce the tubing string into the well bore under pressure. 
   
   
       3 . The method of  claim 1  wherein the tubing string comprises jointed tubing. 
   
   
       4 . The method of  claim 1  wherein positioning the workover tool or positioning the tubing string comprises using a logging tool to correlate the end with a depth in the well. 
   
   
       5 . The method of  claim 1  wherein introducing a fracturing fluid comprises:
 pumping a fracturing fluid comprising a plurality of proppant particulates between the tubing string and the well bore; and   simultaneously pumping a base fluid through the tubing string.   
   
   
       6 . The method of  claim 1  wherein isolating the first zone comprises introducing a plurality of proppant particulates into the well bore between the first zone and the second zone to form a bridge. 
   
   
       7 . The method of  claim 1  wherein the workover tool comprises at least one tool selected from the group consisting of: a hydrajetting tool, a perforating gun, a washing tool. 
   
   
       8 . The method of  claim 1  wherein the workover tool may be positioned in the subterranean formation using a method comprising at least one method selected from the group consisting of: pumping through the tubing string, placing with a wireline, placing with a slickline, placing with a coiled tubing string, and dropping through the tubing string. 
   
   
       9 . The method of  claim 4  further comprising circulating a fluid through the tubing string prior to positioning the tubing string using a logging tool. 
   
   
       10 . A method of treating a well bore in a single trip, the method comprising:
 using a hydraulic workover unit to introduce a tubing string into a subterranean formation comprising a well bore, wherein the tubing string has a locking device disposed on an end;   introducing a logging tool into a well bore to position the end of the tubing string;   engaging a hydrajetting tool with the locking device in a first zone of the subterranean formation;   creating or enhancing one or more perforations in the first zone of the subterranean formation using the hydrajetting tool;   positioning a hydrajetting tool in a second zone of the subterranean formation;   pumping a fluid at a rate and pressure sufficient to create or enhance one or more fractures in the subterranean formation; and   isolating the first zone from the second zone.   
   
   
       11 . The method of  claim 10  wherein the pumping a fluid comprises pumping a fracturing fluid comprising a plurality of proppant particulates between the tubing string and the well bore while simultaneously pumping a base fluid through the tubing string. 
   
   
       12 . The method of  claim 10  wherein the second zone is located above the first zone. 
   
   
       13 . The method of  claim 10  wherein the hydrajetting tool is engaged with the locking device by using a method comprising at least one method selected from the group consisting of: pumping through the tubing string, placing with a wireline, placing with a slickline, placing with a coiled tubing string, and dropping through the tubing string. 
   
   
       14 . The method of  claim 10  further comprising:
 washing the well bore using a washing device engaged with the locking device on the end of the tubing string.   
   
   
       15 . The method of  claim 10  wherein the isolating the first zone from the second zone comprises creating a proppant bridge in a casing between the first zone and the second zone. 
   
   
       16 . The method of  claim 10  wherein the isolating the first zone from the second zone comprises using a dump bailer passed through the tubing string to set a plug between the first zone and the second zone. 
   
   
       17 . The method of  claim 11  wherein the fracturing fluid comprises a gelling agent and the base fluid comprises a gel breaker. 
   
   
       18 . A downhole tool system comprising:
 a profile nipple disposed on a tubing string, wherein the profile nipple comprises a locking receptacle; and   a tool assembly, wherein the tool assembly has a locking lug, wherein the locking lug engages the locking lug receptacle, wherein the tool assembly may be passed through the tubing string to engage the profile nipple.   
   
   
       19 . The downhole tool system of  claim 18  wherein the tool assembly comprises at least one tool selected from the group consisting of: a perforating gun, and a washing tool. 
   
   
       20 . The downhole tool system of  claim 18  wherein the tool comprises a hydrajetting tool. 
   
   
       21 . The downhole tool system of  claim 20  wherein the hydrajetting tool comprises dual check valves. 
   
   
       22 . The downhole tool system of  claim 18  wherein the tool assembly may be engaged and retrieved by a wireline, coiled tubing, or a slickline.