Stop collar friction clamping device
AssigneeBaker Hughes Incorporated
InventorsShawn A. Olsen, Roger R. Steinsiek, James C. Hunziker
Life of this patent
Estimating the term…
Abstract
A stop collar assembly used for axially securing and/or to resist axial sliding of a downhole tool device. The assembly provided on a housing of the downhole tool and includes a generally annular ring having an inner circumference beveled outward proximate to the ring edge. A clamp ring having a raised portion on its outer surface is disposed adjacent and substantially coaxial with the annular ring. Pushing the annular ring against the clamp ring compresses the clamp ring onto the housing to resist axial sliding of the annular ring.
Claims13
A clamping assembly for use in a downhole tool comprising:
- an annular wedge ring engagable with the tool and circumscribing a portion of the tool;
- an outer radial surface on the wedge ring having a raised mid portion that defines a ridge and that is profiled radially inward at an angle B from the mid portion to opposing lateral ends of the wedge ring thereby providing a triangular shaped cross section in the wedge ring;
- and
- an annular stop ring circumscribing a portion of the tool adjacent the wedge ring and having a bevel on an inner surface of the stop ring that projects radially outward at an angle C along a lateral end of the stop ring and adjacent the wedge ring, so that when a base mount of an attachment to the downhole tool is axially urged against the bevel on the annular stop ring axially slides along the outer radial surface on the wedge ring towards the ridge to compressively couple the wedge ring to the downhole tool.
A downhole tool disposable in a wellbore tubular comprising:
- a mandrel having an axis;
- a centralizer comprising:
- first and second base members circumscribing the mandrel disposed axially apart;
- and arms having first and second ends respectively coupled with the first and second base members and mid portions bowing radially outward from the mandrel;
- first and second stop collar assemblies engageable to the mandrel and respectively adjacent the first and second base members, each stop collar assembly comprising:
- a stop ring engaged with a wedge ring along an interface that is angled along a line extending from the axis to an outer circumference of a mid-portion of the wedge ring, so that a lateral force pushing the stop ring towards the wedge ring mid portion compressively couples the wedge ring to the mandrel;
- a ridge on the mid portion of the outer circumference of the wedge ring so that the wedge ring has a substantially triangular cross section and bevels on a lateral end of each stop ring adjacent the wedge ring and an interface defined by contact between the bevel and a profile formed by the ridge.
Dependencies are inferred from the claim text.