PRESSURE REGULATED DOWNHOLE EQUIPMENT
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United States of America Patent
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Issued Date -
Oct 29, 2015
app pub date -
Apr 27, 2015
filing date -
Apr 28, 2014
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Abstract
Methods and apparatus are provided for regulating a pressure in a wellbore by including multiple stages of pressure regulation in a casing to gradually change the pressure in the casing. For example, a method of regulating a pressure of a fluid in a wellbore includes positioning a tubular equipped with a first float assembly having a first unidirectional valve and a second float assembly having a second unidirectional valve, wherein each of the first and second unidirectional valves include an inlet and an outlet; and reducing a pressure differential across the first unidirectional valve when a pressure at the outlet is higher than a pressure at the inlet by a predetermined amount.
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