Method and apparatus for completing and fluid treating a wellbore

Abstract

A wellbore fluid treatment apparatus capable of being actuated by a sealing device. The apparatus includes a casing including a bore and a casing port opened through the wall of the casing. The apparatus also includes a sleeve located within the casing bore. The sleeve includes a sleeve port opened through the wall of the sleeve and a baffle seat forming an inner flow area and configured to receive the sealing device. The sleeve is moveable by the sealing device between a closed position preventing fluid flow from the bore through the casing port and an open position allowing fluid flow from the bore through the sleeve port and casing port. The apparatus also includes a reverse cement shoe attached to the casing. The reverse cement shoe has a valve that allows the casing to be cemented by displacing cement only on the outside of the casing.

1 . A wellbore fluid treatment apparatus capable of being actuated by a sealing device, the apparatus comprising:
 a casing including a bore and a casing port opened through the wall of the casing;   a sleeve located within the casing bore and including:
 a sleeve port opened through the wall of the sleeve; 
 a baffle seat forming an inner flow area and configured to receive the sealing device; and 
 the sleeve being moveable by the sealing device between a closed position preventing fluid flow from the bore through the casing port and an open position allowing fluid flow from the bore through the sleeve port and casing port; and 
   a reverse cement shoe attached to the casing and including a valve allowing the casing to be cemented by displacing cement only on the outside of the casing.   
     
     
         2 . The apparatus of  claim 1 , further comprising:
 more than one casing port; and   wherein the sleeve includes sleeve ports corresponding with the casing ports.   
     
     
         3 . The apparatus of  claim 1 , further comprising:
 more than one casing port spaced apart axially along the casing;   more than one sleeve corresponding to spaced apart casing ports, each sleeve baffle seat being configured to receive a different size sealing device; and   the size of baffle seat inner flow areas progressively decreasing such that a sealing device may flow through at least one sleeve before reaching a subsequent sleeve.   
     
     
         4 . The apparatus of  claim 1 , wherein the sleeve is axially slideable between the closed and open positions. 
     
     
         5 . The apparatus of  claim 1 , wherein the sleeve is moveable from the closed position to the open position upon a pressure differential across the baffle seat. 
     
     
         6 . The apparatus of  claim 1 , wherein the baffle seat is configured to form a fluid tight seal with the sealing device, preventing fluid flow past the baffle seat. 
     
     
         7 . The apparatus of  claim 1 , wherein wellbore treatment fluid may flow from the bore into the formation with the sleeve in the open position. 
     
     
         8 . The apparatus of  claim 7 , wherein the wellbore treatment fluid is a fracturing fluid, an acidized fluid, or any combination of the two. 
     
     
         9 . A method of fluid treating a wellbore, the method comprising:
 running a casing into the wellbore, the casing comprising a bore, a casing port opened through the wall of the casing, and a sleeve located in the casing bore, wherein the sleeve includes a sleeve port and is in a closed position preventing fluid flow from the bore through the casing port;   cementing the casing in the wellbore by flowing cement from the surface down the casing annulus, with cement being displaced only on the outside of the casing;   flowing a sealing device through the casing bore and into engagement with a baffle seat of the sleeve;   moving the sleeve from closed position to an open position, the sleeve port allowing fluid flow from the bore through the casing port in the open position; and   flowing well treatment fluids from the bore into the formation through the casing port.   
     
     
         10 . The method of  claim 9 , wherein cementing the casing in the wellbore further comprises allowing fluids to flow into the casing bore through a reverse cement shoe. 
     
     
         11 . The method of  claim 9 , further comprising preventing fluid flow through an inner flow area of the baffle seat by forming a fluid tight seal with the sealing device. 
     
     
         12 . The method of  claim 9 , wherein the casing further includes:
 a set of casing ports; and   wherein the sleeve includes sleeve ports corresponding to the casing ports.   
     
     
         13 . The method of  claim 9 , further including:
 the casing including more than one casing port spaced apart axially along the casing;   wherein running a casing into the wellbore includes running in more than one sleeve corresponding to each casing port, each sleeve baffle seat inner flow area being a different size and progressively decreasing with each sleeve; and   flowing the sealing device through at least one sleeve before engaging a subsequent sleeve.   
     
     
         14 . The method of  claim 13 , further including flowing more than one sealing device in the casing bore, each sealing device engaging a different sleeve. 
     
     
         15 . The method of  claim 14 , further including:
 moving each sleeve from the closed position to the open position by creating a pressure differential across the sleeve baffle seats, the sleeve ports allowing fluid flow from the bore through the casing port in the open position; and   flowing well treatment fluids from the bore into the formation through the casing ports.   
     
     
         16 . The method of  claim 9 , moving the sleeve further including axially sliding the sleeve between the closed and open positions. 
     
     
         17 . The method of  claim 9 , further including creating a pressure differential across the baffle seat to move the sleeve from the closed position to the open position. 
     
     
         18 . The method of  claim 9 , wherein flowing wellbore treatment fluid includes flowing wellbore treatment fluid selected from at least one of the group consisting of acid, gelled acid, gelled water, gelled oil, carbon dioxide, nitrogen, and any of these fluids containing proppants. 
     
     
         19 . The method of  claim 9 , further including flowing the sealing device back to the surface. 
     
     
         20 . The method of  claim 9 , further including allowing fluids to flow from the formation through the casing ports and into the casing bore. 
     
     
         21 . A method of servicing a wellbore, including:
 running a ported casing into the wellbore, wherein one or more ports may be in a closed position;   pumping cement from the surface down the casing annulus;   isolating a portion of the casing prior to or after pumping the treatment fluid; and   pumping a treatment fluid from the surface through the casing and out one or more ports into the formation.   
     
     
         22 . The method of  claim 21 , further including opening one or more ports.