Downhole tool

摘要

A downhole tool comprising an inner sleeve with a plurality of sleeve ports and a housing positioned radially outwardly of the inner sleeve and having a plurality of housing ports, with the housing and inner sleeve partially defining a space radially therebetween. The space is occupied by a shifting sleeve. A fluid path extends between the interior flowpath of the tool and the space. A fluid control device, such as a burst disk, occupies at least portion of the fluid path. In one state, the shifting sleeve is in a first position between the housing ports and the sleeve ports to prevent fluid flow between the interior flowpath and exterior of the tool. The fluid control device may selectively permit fluid flow, and thus pressure communication, into the annular space to cause a differential pressure across the shifting sleeve. When a sufficient differential pressure is reached, the shifting sleeve is moved to a second position, which opens the communication paths through the housing and sleeve ports between the interior flowpath and exterior flowpath of the tool.

主权项

1. A downhole tool having an interior flowpath and an exterior, the tool comprising:
a nested sleeve assembly comprising a shifting sleeve, the shifting sleeve having a first position, a second position, a first end and a second end, the first end and second end each in fluid isolation from the interior flowpath and the exterior; and an indexing assembly in communication with the shifting sleeve, the indexing assembly having, a run in position, an actuated position and at least one non-actuated position between the run in position and the actuated position; wherein, the indexing assembly advances from a first non-actuated position to the actuated position in response to a predetermined stimulus; further, wherein the indexing assembly prevents the shifting sleeve from moving to the second position when the indexing assembly is in the at least one non-actuated position; and a collet assembly in communication with the shifting sleeve and the indexing assembly, wherein said collect assembly comprises a collet and a collet retainer; wherein the collet is connected to the collet retainer and disposed between the shifting sleeve and the indexing assembly; and further wherein the collet and collet retainer are configured to disconnect in response to movement of the indexing assembly to the actuated position.