Gravel pack service tool back pressure valve

An apparatus comprising:

• a service tool configured to be deployed in a wellbore as part of a managed pressure drilling operation of the wellbore, wherein, when the service tool is deployed in the wellbore, an outer annulus is defined between a wall of the wellbore and a work string that includes the service tool, and a drill pipe, the service tool comprising,
• a crossover port;
• a ball seat configured to receive a ball from uphole such that after receipt of the ball a pressure is exceeded from a fluid flow to cause at least one shear pin to shear such that the service tool is to stroke down to create a fluid communication path for proppant to be pumped through the crossover port and a return back through an inner annulus, as part of gravel packing;
• and
• a valve configured to maintain a back side pressure in the outer annulus without pressurizing the work string, and, in response to a determination that forward circulation is needed and prior to a gravel pack packer reaching a setting depth in the wellbore, configured to open when fluid is pumped down the drill pipe so that a pressure in the area of the service tool above the valve and in the drill pipe is substantially the same as the back side pressure, and configured to close after receiving a setting object.

A system comprising:

• a work string to be deployed downhole in a wellbore wherein, when the work string is deployed in the wellbore, an annulus is defined between a wall of the wellbore and the work string, the work string comprising,
• a drill pipe;
• a lower completion;
• and
• a service tool configured to be coupled below the drill pipe to the lower completion as part of a managed pressure drilling operation of the wellbore, the service tool comprising,
• a crossover port;
• and
• a valve to be positioned below the crossover port and configured to maintain a back side pressure in the annulus without pressurizing the work string, and, in response to a determination that forward circulation is needed and prior to a gravel pack packer reaching a setting depth in the wellbore, configured to open when fluid is pumped down the drill pipe so that a pressure in the area of the service tool above the valve and in the drill pipe is substantially the same as the back side pressure, and configured to close after receiving a setting object.