System and Method for Completing Multiple Well Intervals

A valve for use in a wellbore having a plurality of well zones, comprising:

• a housing having an axial bore therein;
• a flapper arranged within the housing, the flapper being moveable between an open position wherein communication via the axial bore of the housing is uninterrupted and a closed position wherein communication via the axial bore of the housing is interrupted;
• and
• an actuator for moving the flapper from the open position to the closed position, the actuator comprising:
• (i) an energy supplying device connected to the flapper to provide sufficient energy to move the flapper from the open position to the closed position, (ii) a sleeve arranged within the axial bore of the housing, the sleeve adapted to engage the flapper and prevent the flapper from moving to the open position, (iii) a piston element formed on the sleeve and protruding radially outward, (iv) a sealed chamber arranged proximate the housing, the chamber having an internal pressure less than pressure of the wellbore, and (v) a conduit connecting the chamber to the axial bore of the housing behind the piston element of the sleeve.

A method for use in a wellbore having a plurality of well zones, comprising:

• running a casing having a plurality of valves from a surface down into the wellbore such that each valve is proximate a well zone, wherein each valve is in an open position thereby facilitating hydraulic communication therethrough;
• cementing the casing to the wellbore;
• and
• closing a selected valve to interrupt communication between the surface and well zones below the selected valve.

A method for use in a wellbore having a plurality of well zones, comprising the following steps:

• (a) providing a casing string having at least a lower valve and an upper valve connected inline thereto;
• (b) running the casing string from a surface down into the wellbore such that each valve is proximate a well zone, wherein each valve is in an open position thereby facilitating hydraulic communication therethrough;
• (b) cementing the casing string to the wellbore;
• (c) perforating the well zone proximate the lower valve
• (d) closing the lower valve to interrupt communication between the surface and any well zones below the lower valve;
• (e) treating the well zone proximate the lower valve;
• and
• (f) repeating steps (c) and (d) for the upper valve.