Pressure regulated downhole equipment
AssigneeWeatherford Technology Holdings, LLC
InventorJeffery MORRISON
Life of this patent
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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.
Claims25
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.
A system for regulating a pressure of a fluid in a wellbore, comprising:
- a tubular;
- a first float assembly disposed in the tubular, wherein the first float assembly includes a first unidirectional valve for allowing fluid to flow in a first direction;
- a second float assembly disposed in the tubular, wherein the second float assembly includes a second unidirectional valve for allowing fluid to flow in the first direction;
- wherein the first float assembly is equipped with a pressure regulating device configured to actuate when a predetermined pressure differential is reached.
A method of regulating a pressure of a fluid in a wellbore, comprising:
- positioning a tubular equipped with a first float assembly having a first unidirectional valve and a second float assembly having a second unidirectional valve in a wellbore, 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 of the first unidirectional valve is higher than a pressure at the inlet of the second unidirectional valve by a predetermined amount.
Dependencies are inferred from the claim text.