Downhole valve assembly and method of using same

Abstract

Actuatable valve tool including a tubular housing forming an axial flowbore. A slidable flow tube disposed within the housing and a shear sleeve disposed around at least a portion of the slidable flow tube. One or more valves disposed within the housing, each having an open position and a closed position. In the open position the one or more valves permit fluid flow within the axial flowbore, and in the closed position the one or more valves block fluid flow therethrough. The slidable flow tube moveable within the housing to transition the one or more valves between the closed position and the open position.

1 . An actuatable valve tool comprising:
 a tubular housing having an axial flowbore;   a slidable flow tube disposed within the housing and having the axial flowbore therethrough;   a shear sleeve disposed around at least a portion of the slidable flow tube;   one or more valves disposed within the housing, each having an open position and a closed position;   wherein in the open position the one or more valves permit fluid flow within the axial flowbore, and in the closed position the one or more valves block fluid flow therethrough;   wherein the slidable flow tube is moveable within the housing to transition the one or more valves between the closed position and the open position.   
     
     
         2 . The actuatable valve tool of  claim 1 , wherein the slidable flow tube is moveable from a first position to a second position by a pressure differential, in the first position the one or more valves are in the closed position and in the second position the one or more valves are in the open position, thereby allowing fluid flow in a first direction. 
     
     
         3 . The actuatable valve tool of  claim 2 , wherein the pressure differential is formed between the axial flowbore and an annulus between the tubular housing and the slidable flow tube. 
     
     
         4 . The actuatable valve tool of  claim 2 , wherein the slidable flow tube is moveable to a third position, the third position having the slidable flow tube fixed relative to housing with one more valves in the open position such that the flowbore allows fluid flow in the first direction and a second direction opposite the first direction. 
     
     
         5 . The actuatable valve tool of  claim 4 , wherein the slidable flow tube is moveable from the first position to the second position by application of a pressure differential and the slidable flow tube is movable to the third position by releasing of the pressure differential. 
     
     
         6 . The actuatable valve tool of  claim 5 , wherein the slidable flow tube is moveable to a fourth position by the application of a pressure differential, and upon release of the pressure differential the slidable flow tube returns to the first position. 
     
     
         7 . The actuatable valve tool of  claim 1 , wherein an indexing sleeve is coupled with the slidable flow tube and configured to allow the slidable flow tube to move between a first position, a second position, a third position, and a fourth position. 
     
     
         8 . The actuatable valve tool of  claim 7 , wherein the indexing sleeve is a J-slot. 
     
     
         9 . The actuatable valve tool of  claim 1 , wherein the slidable flow tube includes a first flow tube portion and a second flow tube portion coupled together by the shear sleeve, the portions separable when the shear sleeve is sheared. 
     
     
         10 . The actuatable valve tool of  claim 9 , wherein the shear sleeve has two shear sections, a first shear section adjacent the first flow tube portion of the slidable flow tube, and a second shear section adjacent the second flow tube portion of the slidable flow tube. 
     
     
         11 . The actuatable valve tool of  claim 10 , wherein the first shear section is configured to shear at a first pressure differential and the second shear section is configured to shear at a second pressure differential, the second pressure differential higher than the first pressure differential. 
     
     
         12 . The actuatable valve tool of  claim 10 , wherein the shear sleeve has a middle portion disposed between the first shear section and the second shear section. 
     
     
         13 . The actuatable valve tool of  claim 12 , wherein the tubular housing has a plurality of ports and the middle portion covers the plurality of ports upon shearing of the first shear section. 
     
     
         14 . The actuatable valve tool of  claim 11 , wherein shearing of the first shear section decouples the first flow tube portion of the slidable flow tube and the second flow tube portion of the slidable flow tube. 
     
     
         15 . A wellbore servicing system comprising:
 a work string coupled with an actuatable valve tool; and   the actuatable valve tool comprising:
 a tubular housing having an axial flowbore; 
 a slidable flow tube disposed within the housing; 
 a shear sleeve disposed around at least a portion of the slidable flow tube; 
 one or more valves disposed within the housing, each having an open position and a closed position; 
 wherein in the open position the one or more valves permit fluid flow within the axial flowbore, and in the closed position the one or more valves block fluid flow therethrough; 
   wherein the slidable flow tube is moveable within the housing to transition the one or more valves between the closed position and the open position.   
     
     
         16 . The wellbore servicing system of  claim 15 , wherein the slidable flow tube is moveable from a first position to a second position by a pressure differential, in the first position the one or more valves are in the closed position and in the second position the one or more valves are in the open position, thereby allowing fluid flow in a first direction. 
     
     
         17 . The wellbore servicing system of  claim 15 , wherein the slidable flow tube includes a first flow tube portion and a second flow tube portion coupled together by the shear sleeve, the sections separable when the shear sleeve is sheared. 
     
     
         18 . The wellbore servicing system of  claim 17 , wherein the shear sleeve has two shear sections, a first shear section adjacent the first flow tube portion of the slidable flow tube, and a second shear section adjacent the second flow tube portion of the slidable flow tube. 
     
     
         19 . The wellbore servicing system of  claim 18 , wherein the first shear section is configured to shear at a first pressure differential and the second shear section is configured to shear at a second pressure differential, the second pressure differential higher than the first pressure differential. 
     
     
         20 . The wellbore servicing system of  claim 17 , wherein the tubular housing has a plurality of ports and the middle portion covers the plurality of ports upon shearing of the first shear section and the shear sleeve has a middle portion disposed between the first shear section and the second shear section configured to cover the plurality of vents. 
     
     
         21 . A method comprising:
 disposing an actuatable valve tool within a wellbore, the actuatable valve tool having
 a tubular housing having an axial flowbore and one or more valves, the one or more valves transitionable between an open position and a closed position, the open position permitting fluid flow through the axial flowbore, and the closed position blocking flow through the axial flow bore, 
 a slidable flow tube disposed within the housing and slidable between a first position and second position to transition the one or more valves between the open position and closed positions, the slidable flow tube having a first flow tube portion and a second flow tube portion, and 
 a shear sleeve disposed about the slidable flow tube and joining the first flow tube portion and a second flow tube portion; and 
   shearing the shear sleeve disposed about the slidable flow tube and separating the first portion and the second portion of the slidable flow tube.   
     
     
         22 . The method of  claim 21  further comprising dropping a ball within the axial flowbore of the actuatable valve tool to impede flow through the axial flowbore, thereby increasing pressure and shearing the shear sleeve. 
     
     
         23 . The method of  claim 21 , wherein the shearing occurs in response to generating a first pressure differential in the actuatable valve tool. 
     
     
         24 . The method of  claim 23 , further comprising generating a second pressure differential higher than the first pressure differential within the actuatable valve tool thereby shearing a second shear section of the shear sleeve. 
     
     
         25 . The method of  claim 24 , wherein the tubular housing has one or more ports to the exterior of the tubular housing, and upon shearing the second section of the shear sleeve, a middle portion of the shear sleeve blocks the one or more ports.