Multi-Zone Screened Fracturing System

Abstract

A multi-zone formation treatment assembly has sections disposed on a tubular structure in a borehole. An isolation element disposed on the tubular structure that isolates a borehole annulus around the section from the other sections, and a flow valve disposed on the tubular structure is selectively operable between opened and closed conditions permitting and preventing fluid communication between the through-bore and the borehole annulus. A screen disposed on the tubular structure communicates with the borehole annulus, and a closure disposed on the tubular structure at least prevents fluid communication from the through-bore to the screen. A workstring of the assembly can be manipulated in the tubular structure relative to each section in the same trip to: open the flow valve, position in the through-bore relative to the open flow valve, deliver the treatment from an outlet to the section through the open flow valve, and close the flow valve.

1 . A multi-zone formation treatment assembly for a borehole, comprising:
 a tubular structure disposed in the borehole and defining a through-bore;   a plurality of sections disposed on the tubular structure, each of the sections comprising:
 an isolation element disposed on the tubular structure and isolating a borehole annulus around the section from the other sections, 
 a flow valve disposed on the tubular structure and selectively operable between opened and closed conditions permitting and preventing fluid communication between the through-bore and the borehole annulus, 
 a screen disposed on the tubular structure and communicating with the borehole annulus, and 
 a closure disposed on the tubular structure and at least preventing fluid communication from the through-bore to the screen; and 
   a workstring defining an outlet and being manipulated in the tubular structure relative to each section in the same trip to: open the flow valve, position in the through-bore relative to the open flow valve, deliver the treatment from the outlet to the section through the open flow valve, and close the flow valve.   
     
     
         2 . The assembly of  claim 1 , wherein the isolation element comprises a swellable packer, a hydraulically-set packer, or a mechanically-set packer. 
     
     
         3 . The system of  claim 1 , wherein the flow valve comprises a sleeve movable in the through-bore between (a) the closed condition preventing fluid communication through at least one flow port in the tubular structure and (b) the opened condition permitting fluid communication through the at least one flow port. 
     
     
         4 . The assembly of  claim 1 , wherein the closure is selectively operable between (a) a closed condition preventing fluid communication between the through-bore and the screen and (b) an opened condition permitting fluid communication between the through-bore and the screen. 
     
     
         5 . The assembly of  claim 4 , wherein the closure comprises a sleeve movable in the through-bore between (a) the closed condition preventing fluid communication through at least one flow port in the tubular structure, the at least one flow port in communication with the screen, and (b) the open condition permitting fluid communication through the at least one flow port. 
     
     
         6 . The assembly of  claim 1 , wherein the closure comprises a one-way valve disposed on the tubular structure and in fluid communication between the screen and the through-bore, the one-way valve permitting fluid communication from the screen into the through-bore and preventing fluid communication from the through-bore to the screen. 
     
     
         7 . The assembly of  claim 6 , wherein the one-way valve comprises:
 a housing disposed on the tubular structure and communicating the screen with at least one flow port in the tubular structure; and   a check ball movably disposed in the housing, the check ball permitting fluid communication from the screen to the at least one flow port and preventing fluid communication from the at least one flow port to the screen.   
     
     
         8 . The assembly of  claim 1 , wherein the screen comprises first and second screen sections disposed on the tubular structure on both sides of at least one flow port in the tubular structure, the screen sections communicating with the at least one flow port. 
     
     
         9 . The assembly of  claim 8 , wherein the closure is selectively operable between (a) a closed condition preventing fluid communication through the at least one flow port between the through-bore and the screen sections and (b) an opened condition permitting fluid communication through the at least one flow port between the through-bore and the screen sections. 
     
     
         10 . The assembly of  claim 9 , wherein the closure comprises a sleeve movable in the through-bore between the closed and opened conditions. 
     
     
         11 . The assembly of  claim 8 , wherein the closure comprises a one-way valve disposed on the tubular structure and in fluid communication between the first and second screen sections and the at least one flow port, the one-way valve permitting fluid communication from the first and second screen sections into the at least one flow port and preventing fluid communication from the at least one flow port to the first and second screen sections. 
     
     
         12 . The assembly of  claim 11 , wherein the one-way valve comprises:
 a housing disposed on the tubular structure and communicating the screen sections with the at least one flow port; and   first and second check balls movably disposed in the housing, each of the check balls permitting fluid communication from one of the screen sections to the at least one flow port and preventing fluid communication from the at least one flow port to the one screen section.   
     
     
         13 . The assembly of  claim 1 , wherein the workstring is manipulated in the same trip to open the closures after treatment of all of the sections. 
     
     
         14 . The assembly of  claim 1 , wherein workstring comprises an actuating tool operable to open and close the flow valves of the sections in the same trip in the through-bore. 
     
     
         15 . The assembly of  claim 14 , wherein the actuating tool is hydraulically operable. 
     
     
         16 . The assembly of  claim 14 , wherein the actuating tool is operable to at least open the closures of the sections in the same trip in the through-bore. 
     
     
         17 . The assembly of  claim 1 , wherein the workstring positions unsealed in the through-bore relative to the open flow valve. 
     
     
         18 . A multi-zone formation treatment assembly for a borehole, comprising:
 a tubular structure disposed in the borehole and defining a through-bore;   a plurality of sections disposed on the tubular structure, each of the sections comprising:
 means for isolating a borehole annulus of the section from the other sections, 
 means for selectively permitting and preventing fluid communication from the through-bore to the borehole annulus through a first flow path, 
 means for screening fluid communication from the borehole annulus to the through-bore through a second flow path, and 
 means for at least preventing fluid communication from the through-bore to the borehole annulus through the second flow path; and 
   a workstring positioning in the through-bore relative to each of the sections and having means for delivering the treatment to each of the sections in the same trip.   
     
     
         19 . The assembly of  claim 18 , wherein the workstring comprises means for actuating the means for selectively permitting and preventing fluid communication from the through-bore to the borehole annulus through the first flow path. 
     
     
         20 . The assembly of  claim 18 , wherein the means for selectively permitting and preventing fluid communication from the through-bore to the borehole annulus through the first flow path comprises means for selectively opening and closing a first flow port in the tubular structure communicating the through-bore with the borehole annulus. 
     
     
         21 . The assembly of  claim 18 , wherein the means for at least preventing fluid communication from the through-bore to the borehole annulus through the second flow path comprises means for selectively permitting and preventing fluid communication from the through-bore to the borehole annulus through the second flow path. 
     
     
         22 . The assembly of  claim 21 , wherein the means for selectively permitting and preventing fluid communication from the through-bore to the borehole annulus through the second flow path comprises means for selectively opening and closing a second flow port in the tubular structure. 
     
     
         23 . The assembly of  claim 22 , wherein the workstring comprises means for actuating the means for selectively opening and closing the second flow port in the tubular structure. 
     
     
         24 . The assembly of  claim 18 , wherein the means for at least preventing fluid communication from the through-bore to the borehole annulus through the second flow path comprises means for exclusively permitting fluid communication of the screened fluid into the through-bore through the second flow path. 
     
     
         25 . The assembly of  claim 18 , wherein the workstring positions unsealed in the through-bore relative to each section. 
     
     
         26 . A multi-zone formation treatment method for a borehole, the method comprising:
 isolating a borehole annulus of the borehole around an assembly into a plurality of isolated zones, the assembly in each isolated zone having a first port and a screen communicating a through-bore of the assembly with the borehole annulus;   positioning a workstring in the through-bore of the assembly; and   treating each of the isolated zones without sealing the workstring in the through-bore by:
 selectively opening the first port in the assembly at the isolated zone with the workstring, 
 flowing the treatment down the workstring to the isolated zone through the opened first port, 
 at least preventing fluid communication from the through-bore to the borehole annulus through the screen on the assembly at the isolated zone, and 
 selectively closing the first port at the isolated zone with the workstring after treatment. 
   
     
     
         27 . The method of  claim 26 , wherein positioning the assembly in the borehole comprises positioning the assembly in casing having perforations, in an expanded liner having slots, or in an open hole. 
     
     
         28 . The method of  claim 27 , wherein isolating the borehole annulus of the borehole around the assembly into the isolated zones comprises engaging isolation elements on the assembly against a wall of the casing, a wall of the expanded liner, or a wall of the open hole. 
     
     
         29 . The method of  claim 26 , wherein positioning the workstring in the through-bore of the assembly comprises positioning the workstring unsealed in the through-bore of the assembly. 
     
     
         30 . The method of  claim 26 , wherein selectively opening the first port in the assembly at the isolated zone with the workstring comprises shifting a sleeve in the assembly away from the first port with the workstring. 
     
     
         31 . The method of  claim 30 , wherein flowing the treatment down the through-bore to the isolated zone through the opened first port comprises flowing the treatment through an outlet in the workstring positioned with respect to the opened first port. 
     
     
         32 . The method of  claim 26 , wherein at least preventing fluid communication from the through-bore to the borehole annulus through the screen on the assembly at the isolated zone comprises selectively preventing fluid communication from the through-bore to the borehole annulus. 
     
     
         33 . The method of  claim 32 , further comprising preparing each of the isolated zones for production by:
 selectively opening a second port in the assembly at the isolated zone with the workstring, the second port communicating the through-bore with the screen; and   permitting fluid communication from the borehole annulus into the through-bore through the screen and the opened second port at the isolated zone.   
     
     
         34 . The method of  claim 33 , further comprising screening fluid from the borehole annulus of the isolated zones into the through-bore of the assembly through the screens and the opened second ports. 
     
     
         35 . The method of  claim 33 , further comprising exclusively preventing fluid communication from the through-bore to the borehole annulus of the isolated zones through the screens after selectively opening the second ports. 
     
     
         36 . The method of  claim 33 , wherein selectively opening the second port in the assembly at the isolated zone with the workstring comprises shifting a sleeve in the assembly away from the second port with the workstring.