Patent ID: 9243480
Filing Date: 2016-01-26
CPC Classification: E21B

Claim Text:
1. A system for activating a down hole tool, the system comprising: a base pipe having an interior and defining a port that communicates with a pressure chamber positioned outside of the base pipe; a sleeve positioned in the interior to substantially block the port and to prevent substantial fluid communication between the interior and the pressure chamber, the sleeve having a first portion engaging the base pipe and a second portion engaging the first portion, the first portion having a first shear resistance for resisting movement of the first portion with respect to the base pipe, and the second portion having a second shear resistance for resisting movement of the second portion with respect to the first portion, wherein movement of the first portion with respect to the base pipe in response to overcoming the first shear resistance exposes the port to permit fluid communication between the interior and the pressure chamber for activating the down hole tool; a stop member positioned in the base pipe down hole of the sleeve, the stop member being sized to limit down hole movement of the first portion beyond the stop member, and sized to permit down hole movement of the second portion beyond the stop member; and a plug engageable with the sleeve to substantially plug the interior, wherein the plug includes an engagement member located at an uphole end of the plug and having an outer diameter less than an inner diameter of the first portion, and further includes a plurality of wiper members at a downhole end of the plug that flex to traverse the sleeve and the stop member.