Pressure controlled multi-shift frac sleeve system
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United States of America Patent
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Jul 19, 2016
Grant Date -
Jun 12, 2014
app pub date -
Dec 6, 2013
filing date -
Dec 7, 2012
priority date (Note) -
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Abstract
A frac sleeve system includes an outer sleeve with openings, an inner sleeve with ports, a pressure seat, a bottom locking device and a spring device. In a closed configuration of the inner sleeve, the openings and ports are not aligned for any fluid connection. In an opened configuration, at least one opening is aligned with at least one port for a fluid connection through the system. The inner sleeve shifts back and forth between configurations according to the pressure seat and the spring. The interaction of a guide pin on the outer sleeve and the guide slot on the inner sleeve controls the rotational and longitudinal movement of the inner sleeve along the common axis of the inner sleeve and outer sleeve so that there is unlimited shifting between configurations. The locking devices and spring device are also reuseable for the multiple shifting.
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