Pressure compensation piston for dynamic seal pressure differential minimization
AssigneeHalliburton Energy Services, Inc.
InventorJoseph Robert Munguia
Life of this patent
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Abstract
Disclosed herein are embodiments of a pressure compensation piston and embodiments of rotary seal assemblies. In one embodiment, a pressure compensation piston for use with a rotary seal assembly includes a stepped piston having an opening extending there through for positioning the stepped piston about a rotatable shaft of a rotary seal assembly. In accordance with this embodiment, the pressure compensation piston further includes a rotary seal positioned along a radial surface of the opening for sealing the stepped piston relative to the rotatable shaft.
Claims20
A pressure compensation piston for use with a rotary seal assembly, comprising:
- a stepped piston having an opening extending there through for positioning the stepped piston about a rotatable shaft of a rotary seal assembly, wherein the opening includes a diameter (D0) and a circumferential profile extending radially outward into the stepped piston, and further wherein the stepped piston includes a first diameter (D1) portion and a second greater diameter (D2) portion, and further wherein the circumferential profile is located in the first diameter (D1) portion;
- a rotary seal positioned within the circumferential profile along a radial surface of the opening for sealing the stepped piston relative to the rotatable shaft;
- a first linear dynamic seal positioned at least partially within a radially exterior surface of the first diameter (D1) portion to seal the first diameter (D1) portion relative to a housing surrounding the pressure compensation piston;
- and
- a second linear dynamic seal positioned at least partially within a radially exterior surface of the second diameter (D2) portion to seal the second diameter (D2) portion relative to the housing.
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A rotary seal assembly, comprising:
- a housing;
- a rotatable shaft positioned in a longitudinal opening in the housing, the housing and rotatable shaft forming a cavity there between;
- and
- a pressure compensation piston positioned in the cavity, the pressure compensation piston including:
- a stepped piston having an opening extending there through for positioning the stepped piston about the rotatable shaft;
- and
- a rotary seal positioned along a radial surface of the opening for sealing the stepped piston relative to the rotatable shaft, the stepped piston having a first piston Area (AA) configured to receive bore pressure from fluid within the housing, a second piston Area (AB) configured to receive annulus pressure from outside the housing, and a third piston Area (AC) isolated from the fluid within the housing and the fluid outside of the housing, and further wherein Area (AC)>Area (AB)>Area (AA).
A well system, comprising:
- a wellbore located within a subterranean formation;
- a rotary seal assembly positioned in the wellbore via a conveyance, the rotary seal assembly including:
- a housing;
- a rotatable shaft positioned in a longitudinal opening in the housing, the housing and rotatable shaft forming a cavity there between;
- and
- a pressure compensation piston positioned in the cavity, the pressure compensation piston including:
- a stepped piston having an opening extending there through for positioning the stepped piston about the rotatable shaft;
- and
- a rotary seal positioned along a radial surface of the opening for sealing the stepped piston relative to the rotatable shaft, the stepped piston having a first piston Area (AA) configured to receive bore pressure from fluid within the housing, a second piston Area (AB) configured to receive annulus pressure from outside the housing, and a third piston Area (AC) isolated from the fluid within the housing and the fluid outside of the housing, and further wherein Area (AC)>Area (AV)>Area (AA).
Dependencies are inferred from the claim text.