Frangible flapper valve with hydraulic impact sleeve

A system for selectively hydraulically isolating a portion of a wellbore tubular, the system comprising:

• a flapper valve comprised of a frangible material, wherein the flapper valve is movable between an open position to a closed position that hydraulically isolates a portion of a wellbore tubular;
• a biasing means to bias the flapper valve to the closed position;
• a sleeve within the wellbore tubular, the sleeve including an upper end, a lower end, and a shoulder;
• a first latching mechanism within the wellbore tubular, the first latching mechanism being connected to the sleeve, wherein the first latching mechanism is movable from a first position to a second position, wherein in the first position the lower end of the sleeve is positioned to hold the flapper valve in the open position and in the second position the lower end of the sleeve allows the flapper valve to move to the closed position;
• a piston having an upper end and a lower end, the piston being releasably connected to the wellbore tubular by at least one shearable device, wherein the lower end of the piston contacts the shoulder of the sleeve when the first latching mechanism is moved to its second position;
• wherein the at least one shearable device is adapted to shear under a predetermined pressure within the wellbore tubular and release the piston from the wellbore tubular;
• wherein after the release of the piston, the sleeve moves down the wellbore tubular until the lower end of the sleeve impacts the closed flapper valve.

A system for selectively breaking a closed flapper valve, the system comprising:

• a flapper valve comprised of a frangible material, the flapper valve being adapted to be movable from an open position to a closed position;
• a sleeve, the sleeve being movable from an initial position that holds the flapper valve open to a second position that permits the flapper valve to close;
• means for moving the sleeve to the second position;
• and
• means for selectively retaining the sleeve in the second position until a predetermined pressure is applied, wherein upon application of the predetermined pressure the sleeve is released breaking the closed flapper valve.

A method for selectively isolating a portion of a wellbore tubular, the method comprising:

• holding open a flapper valve with movable device in an initial position;
• moving the movable device up the wellbore tubular to a second position, wherein the flapper valve closes to hydraulically isolate a portion of the wellbore tubular;
• securing the movable device at the second position;
• increasing the pressure within the wellbore tubular to a predetermined amount;
• releasing an impact device within the wellbore tubular, wherein the impact device is adapted to be released at the predetermined amount of pressure;
• and
• breaking the closed flapper valve with the impact device.

A method for selectively hydraulically isolation a portion of a wellbore tubular, the method comprising

• providing a flapper valve within a wellbore tubular, the flapper valve including a biasing mechanism to move the flapper valve to a closed position that hydraulically isolates a portion of the wellbore tubular;
• connecting a sleeve to a latching mechanism within the wellbore tubular, the latching mechanism being movable from a first position to a second position;
• holding open the flapper valve with the sleeve when the latching mechanism is in the first position;
• moving the latching mechanism to the second position, wherein the sleeve permits the flapper valve to close to hydraulically isolate the portion of the wellbore tubular;
• engaging the latching mechanism to a piston, wherein the piston is releasably connected to the wellbore tubular by a shearable device adapted to shear under a predetermined amount of pressure;
• increasing the pressure within the wellbore tubular to the predetermined amount to shear the shearable device;
• the pressure moving the sleeve down the wellbore tubular to break the flapper valve.