Integrated sub system for enhanced oilfield operations

Abstract

An integrated sub system for isolating formations above a targeted reservoir in a well includes a float shoe, a ball seat, a tubular body and a circulation valve. The float shoe includes a first float valve, the first float valve being configured to regulate a flow of a fluid in a single direction. The ball seat is configured to receive a ball. The ball seat includes an aperture configured to permit the fluid through the ball seat prior to the ball seat receiving the ball. The tubular body is configured to house the float shoe and the ball seat. The circulation valve is configured to be actuated hydraulically.

What is claimed is: 
     
         1 . An integrated sub system for isolating formations above a targeted reservoir in a well, the integrated sub system comprising:
 a float shoe comprising a first float valve, the first float valve being configured to regulate a flow of a fluid in a single direction;   a ball seat configured to receive a ball, the ball seat comprising an aperture configured to permit the fluid through the ball seat prior to the ball seat receiving the ball;   a tubular body configured to house the float shoe and the ball seat; and   a circulation valve configured to be actuated hydraulically.   
     
     
         2 . The integrated sub system according to  claim 1 , wherein the float shoe and the ball seat are formed of a drillable material. 
     
     
         3 . The integrated sub system according to  claim 1 , further comprising a float collar comprising a second float valve, the float collar being formed of a drillable material. 
     
     
         4 . The integrated sub system according to  claim 1 , further comprising at least one of the following:
 one or more packers; and   one or more slips.   
     
     
         5 . The integrated sub system according to  claim 4 , wherein the one or more packers and the one or more slips are hydraulically actuated subsequent to a first predetermined pressure being reached within the body by pumping the fluid onto the ball received in the ball seat. 
     
     
         6 . The integrated sub system according to  claim 1 , wherein the circulation valve is disposed along the body uphole from the ball seat. 
     
     
         7 . The integrated sub system according to  claim 1 , wherein the circulation valve is hydraulically actuated from a closed position to an open position subsequent to a second predetermined pressure being reached within the body by pumping the fluid onto the ball received in the ball seat. 
     
     
         8 . The integrated sub system according to  claim 1 , further comprising a plug seat configured to receive a plug, the plug seat comprising an aperture configured to permit the fluid through the plug seat prior to the plug seat receiving the plug. 
     
     
         9 . The integrated sub system according to  claim 8 , wherein the plug seat is disposed within a landing collar or a float collar housed within the body uphole from the circulation valve. 
     
     
         10 . The integrated sub system according to  claim 9 , wherein the circulation valve is hydraulically actuated from an open position to a closed position subsequent to the plug seat receiving the plug and a pressure within the body falling below a third predetermined pressure. 
     
     
         11 . The integrated sub system according to  claim 1 , wherein an uphole end of the body comprises a threaded connection configured to connect with a complementary threaded connection of a liner or casing string of the well. 
     
     
         12 . The integrated sub system according to  claim 1 , wherein a length of the body is equal to or less than 16 feet. 
     
     
         13 . A method for isolating formations above a targeted reservoir in a well, the method comprising:
 pumping a fluid through a tubular body of an integrated sub system;   permitting the fluid through an aperture of a ball seat of the integrated sub system prior to the ball seat receiving a ball;   regulating, by a first float valve of a float shoe of the integrated sub system, a flow of the fluid through the body;   receiving the ball within the ball seat, thereby preventing the fluid from passing through the aperture;   actuating a circulation valve of the integrated sub system hydraulically;   pumping cement through the body of the integrated sub system; and   drilling out, by a drill bit attached to a drill pipe, the float shoe and the first float valve of the integrated sub system.   
     
     
         14 . The method according to  claim 13 , further comprising hydraulically actuating one or more packers and one or more slips of the integrated sub system subsequent to a first predetermined pressure being reached within the body while pumping the fluid onto the ball received in the ball seat. 
     
     
         15 . The method according to  claim 14 , wherein actuating the one or more packers and the one or more slips of the integrated sub system comprises:
 expanding the one or more packers between the body and a wall of a wellbore of the well, thereby isolating the wellbore uphole of the one or more packers from the wellbore downhole of the one or more packers; and   engaging the one or more slips against the wall of the wellbore, thereby anchoring the body within the wellbore.   
     
     
         16 . The method according to  claim 13 , wherein actuating the circulation valve hydraulically comprises transitioning the circulation valve from a closed position to an open position subsequent to a second predetermined pressure being reached within the body while pumping the fluid onto the ball received in the ball seat. 
     
     
         17 . The method according to  claim 16 , wherein actuating the circulation valve hydraulically further comprises transitioning the circulation valve from the open position to the closed position subsequent to a pressure within the body falling below a third predetermined pressure. 
     
     
         18 . The method according to  claim 13 , further comprising isolating, by the ball received in the ball seat, the float shoe from the cement being pumped into the body. 
     
     
         19 . The method according to  claim 18 , further comprising:
 pumping an additional fluid into the body subsequent to the cement;   isolating, by a plug, the cement and the additional fluid, thereby preventing the cement and the additional fluid from mixing;   lowering the plug, by the additional fluid, within the well into a plug seat of the integrated sub system; and   displacing the cement from the body into a wellbore of the well through the circulating valve.   
     
     
         20 . The method according to  claim 13 , further comprising connecting a threaded connection of an uphole end of the body to a complementary threaded connection of a liner or casing string of the well.