Patent ID: 8672035

Claim:
A tool comprising: a tubular body configured to be connected to other tubular bodies, the tubular body having a longitudinal throughbore that permits through passage of fluid; an indexing sleeve movably positioned within the tubular body; a biasing member cooperating with the indexing sleeve to position the indexing sleeve within the tubular body in a first configuration; an index pin located in the tubular body and engaging with the indexing sleeve such that upon axial and/or rotational movement of the index pin relative to the indexing sleeve different predetermined configurations of the tool are obtainable; a valve seat associated with the indexing sleeve and configured to be plugged by an obturator such that fluid pressure can be increased within the tubular body to displace the indexing sleeve against the biasing member, whereby by control of fluid pressure the tool can be cycled selectively between a configuration in which fluid flow through the tubular body is restricted and internal pressure can be increased and a configuration in which fluid flow through the tubular body is permitted and internal pressure can be decreased; and the indexing sleeve comprising a track configured to receive at least one follower or index pin, wherein at least one part of the track is configured to permit the indexing sleeve to move relative to the follower or index pin to uncompress the biasing member to displace the associated valve seat longitudinally within the throughbore into an upper chamber having a diameter larger than an intermediate chamber housing the indexing sleeve, and wherein the indexing sleeve includes at least one port in proximity to the associated valve seat, and accessing the upper chamber when the biasing member is uncompressed to displace the valve seat beyond a sealing position with the intermediate chamber, and thereby form a fluid by-pass channel to re-open the throughbore to fluid flow through the tubular body.