Float equipment assemblies and methods to isolate downhole strings
A float equipment assembly includes an inner string that provides a fluid flow path through the float equipment assembly. The float equipment assembly also includes an opening through which a fluid flowing through the inner string exits the float equipment assembly. The float equipment assembly further includes a moveable member, which when repositioned, isolates the inner string. The float equipment assembly further includes a dissolvable material that initially prevents repositioning of the moveable member, where the moveable member is repositioned after a threshold portion of the dissolvable material has dissolved.
1. A float equipment assembly, comprising:
an inner string that provides a fluid flow path through the float equipment assembly;
a chamber having an opening through which a fluid flowing through the inner string flows through the chamber and exits the float equipment assembly via the opening;
a moveable member which, when repositioned, isolates the inner string; and
a dissolvable material that initially prevents repositioning of the moveable member,
wherein the moveable member is at least partially repositioned within the chamber after a threshold portion of the dissolvable material has dissolved, and
wherein the moveable member comprises of a piston.
2. The float equipment assembly of claim 1 , wherein the moveable member comprises a piston which, when repositioned, closes the opening.
3. The float equipment assembly of claim 2 , wherein the piston is stored in a chamber of the float equipment assembly, and wherein the dissolvable material is a dissolvable plug that initially seals the chamber.
4. The float equipment assembly of claim 3 , wherein after the threshold portion of the dissolvable plug has dissolved, a hydrostatic pressure is applied to the piston to reposition the piston.
5. A method to isolate a downhole string, the method comprising:
deploying a downhole string coupled to a float equipment assembly, the float equipment assembly comprising:
an inner string that provides a fluid flow path from the downhole string through the float equipment assembly;
a chamber having an opening through which a fluid flowing through the inner string flows through the chamber and exits the float equipment assembly via the opening;
a moveable member which, when repositioned, isolates the inner string; and
a dissolvable material that initially prevents repositioning of the moveable member;
flowing a fluid down the downhole string to dissolve a threshold portion of the dissolvable material; and
after the threshold portion of the dissolvable material has dissolved, partially repositioning the moveable member into the chamber to isolate the inner string, and
wherein the moveable member comprises a piston.
6. The method of claim 5 , wherein the moveable member comprises a piston that is stored in a chamber of the float equipment assembly, wherein the dissolvable material is a dissolvable plug, and wherein repositioning the moveable member comprises applying a hydrostatic pressure to the piston after the threshold portion of dissolvable material has dissolved.
7. A downhole completion assembly comprising:
a completion string; and
a float equipment assembly coupled to the completion string, the float equipment assembly comprising:
an inner string that provides a fluid flow path from the completion string through the float equipment assembly;
a chamber having an opening through which a fluid flowing through the inner string flows through the chamber and exits the float equipment assembly via the opening;
a moveable member which, when repositioned, isolates the inner string; and
a dissolvable material that initially prevents repositioning of the moveable member,
wherein the moveable member is repositioned after a threshold portion of the dissolvable material has dissolved, and
wherein the moveable member comprises a piston.