Back to results
US 9,957,774 B2Granted
Pressure staging for wellhead stack assembly
AssigneeHalliburton Energy Services, Inc.
InventorsOwen Ransom Clark, Joseph Michael Karigan
Life of this patent
Estimating the term…
Abstract
A wellhead stack assembly is provided that includes pressure restriction devices. The pressure restriction devices are staged such that each pressure restriction device is coupled to another pressure restriction device for cascading pressure differentials across the pressure restriction devices. Each pressure restriction device includes an active element positionable about a drill pipe for controlling a gap between the drill pipe and the active element.
Claims17
A wellhead stack assembly, comprising:
- a plurality of pressure restriction devices fluidly coupled in series, the pressure restriction devices being staged such that each pressure restriction device is coupled to an adjacent pressure restriction device for cascading pressure differentials across the plurality of pressure restriction devices, each pressure restriction device including an active seal element positionable about a drill pipe to control a gap between the drill pipe and the active seal element,
- wherein the gap of at least some of the plurality of pressure restriction devices is sized for allowing fluid flow from a wellbore to leak to an adjacent pressure restriction device.
A wellhead stack assembly, comprising:
- a first pressure restriction device that includes a first active seal element;
- and
- a second pressure restriction device that includes a second active seal element and that is coupled to the first pressure restriction device by a body housing,
- wherein the first active seal element and the second active seal element form gaps between a passage for receiving a drill pipe and the first active seal element and the second active seal element for causing pressure drops for fluid flow from a wellbore across the first active seal element and the second active seal element,
- wherein a gap formed by the second active seal element is sized for allowing fluid flow from the wellbore to leak to the first pressure restriction device.
2 more elements
A wellhead stack assembly, comprising:
- pressure restriction devices that are staged such that each pressure restriction device is coupled to another pressure restriction device for cascading pressure differentials of fluid from a wellbore across the pressure restriction devices, each pressure restriction device including an active seal element positionable about a drill pipe and being separately controllable for defining a gap between the drill pipe and the active seal element,
- wherein the gap of at least some of the pressure restriction devices is sized for allowing fluid flow from a wellbore to leak to another pressure restriction device.
Dependencies are inferred from the claim text.