Devices and methods to mitigate pressure buildup in an isolated wellbore annulus
AssigneeSaudi Arabian Oil Company
InventorsJinjiang Xiao, Chidirim Enoch Ejim
Life of this patent
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Abstract
A device to mitigate pressure buildup in an isolated wellbore annulus containing fluid includes a tubular body and a container disposed around the tubular body. The container is pre-filled with a charge of gas. When the device is disposed in the isolated wellbore annulus, the gas in the container is compressed in response to expanding fluid in the isolated wellbore annulus.
Claims20
A device to mitigate pressure buildup in an isolated wellbore annulus containing fluid, the device comprising:
- a tubular body having an outer wall surface and a first longitudinal axis;
- a chamber formed with at least one rigid wall, the chamber disposed around the outer wall surface of the tubular body and having a second longitudinal axis extending in the same direction as the first longitudinal axis;
- and
- a flexible container to hold a charge of gas, the flexible container disposed within the chamber and arranged to deform in a direction along the second longitudinal axis in response to fluid pressure changes in an external environment of the device.
A device to mitigate pressure buildup in an isolated wellbore annulus containing fluid, the device comprising:
- a tubular body having an outer wall surface;
- and
- a flexible container pre-filled with a charge of gas and sealed to an external source of gas once pre-filled, the flexible container disposed around the outer wall surface of the tubular body, the flexible container having an external surface that is exposed at an exterior of the device, the flexible container to deform in response to fluid pressure from the external environment of the device acting on the external surface.
A method of mitigating pressure buildup in an isolated wellbore annulus containing fluid, the method comprising:
- pre-filling a flexible container with a charge of gas and sealing the flexible container to an external source of gas once pre-filled with the charge of gas;
- and
- disposing the flexible container pre-filled with the charge of gas in the isolated wellbore annulus, whereby the flexible container pre-filled with the charge of gas deforms in response to fluid pressure changes in the isolated wellbore annulus.
Dependencies are inferred from the claim text.