Downhole apparatus
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United States of America Patent
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Dec 26, 2017
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app pub date -
Mar 7, 2013
filing date -
Mar 7, 2012
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Abstract
A downhole apparatus including a tubular body, first and second ports in a wall of the body, and a fluid pressure-responsive valve arrangement having a locked first configuration associated with a first pressure in which the first port is open and the second port is closed, an unlocked second configuration associated with a second pressure higher than the first pressure in which the first port is open and the second port is closed, and a third configuration associated with a third pressure lower than the second pressure in which the second port is open and the first port is closed.
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