Patent ID: 11970919
Assignee: GRANT PRIDECO, INC.
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 0:
1. A downhole tool comprising:
a housing;
a first piston within the housing configured such that the first piston can move axially under an action of fluid flowing through the tool, wherein the first piston comprises a follower configured to fluidically damp movement of the first piston;
an indexer configured to control axial movement of the first piston between a first, second and third axial position, wherein the indexer is arranged to rotate relative to the first piston;
wherein the indexer is configured such that the first piston can be selectively moved into the third position in accordance with a variation of a flow of fluid through the tool;

a second piston moveable between a closed position in which fluid flowing through the tool is restricted from communicating with an activation chamber and an open position in which fluid flowing through the tool is permitted to communicate with the activation chamber;
wherein the second piston is configured to move between the closed position and the open position in response to the first piston moving to the third axial position.