PRESSURE REGULATED DOWNHOLE EQUIPMENT

摘要

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.

主权项

1. A method of regulating a pressure of a fluid in a wellbore, comprising:
positioning a tubular equipped with a first float assembly and a second float assembly, wherein each float assembly includes a unidirectional valve with an inlet and an outlet; reaching a pressure differential between an upstream pressure and a downstream pressure of the unidirectional valve of the first float assembly; and reducing the pressure differential across the unidirectional valve of the first float assembly when the downstream pressure is higher than the upstream pressure by a predetermined amount.