Pressure Insensitive Counting Toe Sleeve

A downhole tool actuatable in response to applied pressure, the tool comprising:

• a housing defining a housing bore therethrough and defining at least one port communicating the housing bore outside the housing, the housing having a communication path communicating the housing bore with a first internal space and communicating the first internal space with a second internal space;
• a piston having a first piston portion movably disposed in the first internal space and having a second piston portion movably disposed relative to sealed engagement with the second internal space;
• and
• an insert movably disposed in the housing bore and sealably enclosing the second internal space of the housing, the insert being movable from a first position covering the at least one port to a second position uncovering the at least one port,
• the first piston portion movably responsive to the applied pressure from the communication path and moving the second piston portion relative to the sealed engagement with the second internal space,
• the first piston portion counting a number of applications of the applied pressure and permitting fluid communication of the applied pressure from the first internal space to the second internal space in response to the counted number,
• at least a portion of the insert acted upon by the applied fluid pressure in the second internal space initiating movement of the insert from the first position to the second position.

A kit for converting a downhole tool actuatable in response to applied pressure, the downhole tool having a housing with a first housing portion coupleable to a second housing portion, the housing defining a housing bore therethrough and defining at least one port communicating the housing bore outside the housing, the downhole tool having an insert movably disposed in the housing bore, the insert being movable from a first position covering the at least one port to a second position uncovering the at least one port, the kit comprising:

• a modular housing portion coupleable between the first and second housing portions, the modular housing portion configurable to enclose a first internal space with the first housing portion and to at least partially enclose a second internal space with the second housing portion, the modular housing portion having a communication path extending from the first internal space to the second hosing portion;
• and
• an indexer positionable in the communication path, the indexer movably responsive to the applied pressure at the first internal space, the indexer configurable to count a number of applications of the applied pressure and to permit, in response to the counted number, fluid communication of the applied pressure from the first internal space to the second internal space for initiating movement of the insert from the first position to the second position.

A method of opening a sleeve on a tubing string, the method comprising:

• holding an insert toward a closed condition in the sleeve with at least one retainer;
• applying pressure down the tubing string to the sleeve;
• counting at the sleeve a number of applications of the applied pressure;
• permitting fluid communication of the applied pressure from a first part to a second part of the sleeve in response to the counted number;
• and
• shifting the insert toward an opened condition in the sleeve by acting on at least a portion of the insert with the applied pressure in the second part of the sleeve.