Abstract:
A coiled tubing multi-zone frac system for fracing a formation adjacent a well using a sliding sleeve and erodible jets. Erodible jets can provide a means for perforating, fracing and flowing the well which takes the place of two separate tools that are otherwise needed to cause a well to flow, namely, this single tool replaces a perforating gun, a production sleeve.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     The present application claims priority to and the benefit of U.S. Provisional Patent Application Ser. No. 61/245,100 filed on Sep. 23, 2009, entitled “COILED TUBING MULTI-ZONE JET FRAC SYSTEM”. This application is incorporated herein in its entirety. 
    
    
     FIELD 
     The present embodiments generally relate to a coiled tubing multi-zone frac system with a sliding sleeve for fracing a formation adjacent a well bore. 
     BACKGROUND 
     A need exists for a coiled tubing method which enables multi-zone fracing of a well with a movable sleeve. 
     The present embodiments meet these needs. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The detailed description will be better understood in conjunction with the accompanying drawings as follows: 
         FIG. 1  depicts a cross sectional view of a coiled tubing multi-zone jet frac tool in a well bore. 
         FIGS. 2A and 2B  depict a view of a zone in the well bore with the coiled tubing multi-zone jet frac tool in the frac position. 
         FIGS. 3A and 3B  depict a cross sectional view of coiled tubing multi-zone jet frac tool in the run in position. 
         FIGS. 4A and 4B  depict a cross sectional view of the coiled tubing multi-zone jet frac tool in the seeking position. 
         FIGS. 5A and 5B  depict a cross sectional view of the coiled tubing multi-zone jet frac tool in the pack off position. 
         FIG. 6  depict a detail of the well bore with the coiled tubing multi-zone jet frac tool in a reverse position. 
     
    
    
     The present embodiments are detailed below with reference to the listed Figures. 
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     Before explaining the present system in detail, it is to be understood that the system is not limited to the particular embodiments and that it can be practiced or carried out in various ways. 
     The embodiments relate to a coiled tubing multi-zone frac system for fracing a formation adjacent a well bore. 
     The system can include a coiled tubing multi-zone jet frac tool, which can be disposed in a tubing, wherein the coiled tubing multi-zone jet frac tool can be secured to a first end of a movable coiled tubing work string. 
     The system can include one or more sliding sleeve disposed in the tubing in the well bore adjacent the formation. For example, a sliding sleeve can connect a first portion of the tubing to a second portion of the tubing. 
     The sliding sleeve can include a body. The body can have a first end and a second end. 
     A plurality of perforations can be disposed between the first end and the second end. The plurality of perforations can provide fluid communication between the tubing and the well bore. 
     A slidable internal sleeve can be disposed within the body, which can further have a plurality of ports, which can further be adapted to align with the plurality of perforations and provide a fluid flow between the tubing and the well bore. 
     A locking profile can be disposed in the tubing proximate to the second end of the body and can have a seal bore disposed in the tubing between the plurality of ports and the locking profile, which can further provide a sealing engagement with the coiled tubing multi-zone jet frac tool. 
     A coiled tubing multi-zone jet frac tool can be used with the sliding sleeve. The coiled tubing multi-zone jet frac tool can have an internal tubular core with an internal tubular core first end with a shoulder, an internal tubular core second end, a first port, which can be located between the shoulder and the internal tubular core second end, a second port, which can be located between the first port and the internal tubular core second end. 
     The coiled tubing multi-zone jet frac tool can also have a slidable pack off mandrel that can include a first mandrel end with a first pack off element. A second mandrel end can have a drag collet for slidably engaging the internal tubular core and a locking key retainer. 
     When the coiled tubing multi-zone jet frac tool is run into the hole, the locking key retainer can compress at least one locking key. Once the coiled tubing multi-zone jet frac tool is in the hole, at least one locking key can expand and engage a lock profile in the sliding sleeve. 
     The locking key retainer can be made up of a locking key retainer sleeve and a locking key retainer dog for engaging a seal bore of the at least one sliding sleeve. The locking key retainer dog can also engage the seal bore, shear the shearable fastener, pull the sleeve, and expose at least one locking key. 
     The locking keys can be disposed between the first mandrel end and the second mandrel end. At least one locking key can be secured to the slidable pack off mandrel. 
     A shearable fastener can be disposed on the second mandrel end to engage the internal tubular core. The shearable fastener can shear when a locking key engages the locking profile causing the coiled tubing multi-zone jet frac tool to move into a pack off position. The shearable fasteners can be a shear pin. 
     A shifting tool can be disposed adjacent the internal tubular core second end for moving the sliding sleeve from a closed position to an open position after the coiled tubing multi-zone jet frac tool is moved through the sliding sleeve. 
     The shifting tool can have a collet disposed around the internal tubular core for engaging the slidable internal sleeve when the internal tubular core is moved by the movable coiled tubing work string. 
     One or more perforation from the plurality of perforations can have one or more jets disposed therein. One or more of the ports from the plurality of ports can have one or more jests disposed therein. The jets can be erodible. 
     Turning now to the Figures,  FIG. 1  depicts a cross sectional view of the coiled tubing multi-zone jet frac tool  2  in a well bore  4 . 
     The coiled tubing multi-zone jet frac tool  2  can be in a tubing  12  of the well bore  4 . The tubing  12  can have multiple sliding sleeves  10   a ,  10   b , and  10   c  and each sliding sleeve can be adjacent a different formation  3   a ,  3   b , and  3   c    
     The coiled tubing multi-zone jet frac tool  2  can be secured to a first end  5  of a movable coiled tubing work string  6 . 
     Each sliding sleeve  10   a ,  10   b , and  10   c  can be disposed in the tubing  12  in the well bore  4  adjacent the formations  3   a ,  3   b , and  3   c . Each section of the formation can be separated by a packer  13   a ,  13   b , and  13   c . The packer can be inflatable packers, swellable packers, cup packers, other packers known to one skilled in the art, or combinations thereof. 
       FIGS. 2A and 2B  depict a well bore  4  and a view of a zone in the well bore  4  with the coiled tubing multi-zone jet frac tool  2  in the frac position. 
     Fracing can be initiated when the fluid  11  is pumped through the plurality of ports  28   a  and  28   b  and the plurality of perforations  25   a ,  25   b ,  25   c ,  25   d ,  25   e , and  25   f  into at least one formation, such as formation  3   a.    
     The sliding sleeve  10   a  can be disposed adjacent the formation. The sliding sleeve  10  can include a sliding sleeve body  22 , a first end  23 , and a second end  24 . 
       FIG. 2B  shows a plurality of perforations  25   a ,  25   b ,  25   c ,  25   d ,  25   e , and  25   f , which can be disposed between the first end  23  and the second end  24 . 
     The plurality of perforations  25   a ,  25   b ,  25   c ,  25   d ,  25   e , and  25   f  can provide fluid communication between the tubing  12  and the well bore  4 . 
     A slidable internal sleeve  26  can be disposed within the sliding sleeve body  22 . The slidable internal sleeve  26  can have a plurality of ports  28   a  and  28   b . The plurality of ports are shown in this Figure as aligned with the plurality of perforations  25   a  and  25   b ,  25   c ,  25   d ,  25   e , and  25   f . The plurality of ports and the plurality of perforations can provide a fluid flow  29  between the tubing  12  and the well bore  4 . 
     Returning to  FIGS. 2A and 2B , the fluid  11  can be a fluid/particulate mixture. The fluid/particulate mixture can be held in a reservoir  14  and pumped with a pump  15  from a position outside the well bore  4  to an inside diameter of the tubing  12  to the coiled tubing work string  6 . 
     A locking profile  30  can be formed in the tubing  12  proximate to the second end  24  of the sliding sleeve body  22 . The locking profile  30  can engage a locking key  60  to prevent moving of the coiled tubing multi-zone jet frac tool  2  further into the well bore  4 . 
     A seal bore  32  can be disposed in the tubing  12  adjacent locking key  60 . The seal bore  32  can be engaged by a first pack off element  53 . The first pack off element  53  can also engage a first shoulder  41  forming a sealing engagement at the seal bore  32 . 
       FIG. 3A  depicts a cross sectional view of a first half of a coiled tubing multi-zone jet frac tool  2  in the “run in” position.  FIG. 3B  depicts a cross sectional view of the bottom half of the coiled tubing multi-zone jet frac tool  2 . 
     Referring to  FIGS. 3A and 3B , the coiled tubing multi-zone jet frac tool  2  can have an internal tubular core  38  with an internal tubular core first end  40 . A first shoulder  41  can be disposed between the internal tubular core first end  40  and a first port  44 . The second shoulder  43  and the third shoulder  45  can also be seen, but are discussed in detail in  FIG. 5A . The second port  46  can be adjacent the second shoulder  43  shown in  FIG. 3B . 
     A first pack off element  53  can be located on a first mandrel end  52  of a slidable pack off mandrel  50 . 
     The locking key  60  is shown in a collapsed position. A locking key retainer sleeve  70  is shown collapsing the locking key  60  and forming a portion of the locking key retainer  56 . 
     The internal tubular core second end  42  can have a locking key retainer dog  72 , which can engage the locking key retainer  56 . A locking key retainer fastener  57  holds the locking key retainer sleeve  70  to the slidable packoff mandrel  50 . 
     A shearable fastener  62 , which can be a shear pin, a shear ring or shear screw, can hold the slidable pack off mandrel  50  to the internal tubular core  38 . 
     A drag collet  55  can be part of the slidable pack off mandrel  50 . The drag collet  55  can have a plurality of slots and protrusions for engaging a first groove  58  of the internal tubular core  38 . 
     The internal tubular core second end  42  can have a shifting tool  64 , which can have a collet  74 . 
       FIGS. 4A and 4B  depicts cross sectional views of the coiled tubing multi-zone jet frac tool  2  in the seeking position. 
     Referring to  FIGS. 4A and 4B , the coiled tubing multi-zone jet frac tool  2  can be in a “seeking position” and the locking key  60  can be in an expanded orientation. When the coiled tubing multi-zone jet frac tool  2  is in the “seeking position,” the locking key retainer sleeve  70  can be disengaged from the locking key  60 . 
     In addition, when the coiled tubing multi-zone jet frac tool  2  is in the seeking position, the locking key retainer dog  72  can be in a “collapsed” position. The collapsed position can further be referred to as a “locked out” non-engagable position. The locking key retainer fastener  57  can be been sheared off by the sliding engagement of the locking key retainer  56  along the slidable packoff mandrel  50 . 
       FIGS. 5A and 5B  depict cross sectional views of the coiled tubing multi-zone jet frac tool  2  in the pack off position. 
     Referring to  FIGS. 5A and 5B , a first portion of the coiled tubing multi-zone jet frac tool  2  in the pack off position. The first shoulder  41  is shown engaging the first pack off element  53 . Additionally the first pack off element  53  is shown in the expanded position. The slidable pack off mandrel  50  can have limited movement due to the contact of a second shoulder  43  and a third shoulder  45 . 
     The shearable fastener  62  has been sheared allowing the slidable pack off mandrel  50  to move over the internal tubular core  38  to drive the first shoulder  41  into the first pack off element  53 . The drag collet  55  can be positioned on the internal tubular core  38  and can connect with the second groove  61 . 
       FIG. 6  depicts a detail of the well bore  4  with the coiled tubing multi-zone jet frac tool  2  in a reverse frac position. 
     The well bore  4  is depicted having the coiled tubing multi-zone jet frac tool  2  and the sliding sleeve  10   a.    
     The coiled tubing multi-zone jet frac tool  2  can use the locking key  60  to engage the locking profile  30 . The coiled tubing multi-zone jet frac tool  2  is shown in the seeking position as shown in  FIGS. 4A and 4B . 
     Fluid flow  29  can travel between the tubing  12  and the movable coiled tubing work string  6  to the first port  44  and up the inner diameter of the movable coiled tubing work string  6 , flushing out any fluid remaining in the well bore  4  to the surface. 
     While these embodiments have been described with emphasis on the embodiments, it should be understood that within the scope of the appended claims, the embodiments might be practiced other than as specifically described herein.