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US 9,869,414 B2Granted
Tubular connection and associated threadform
AssigneeUltra Premium Oilfield Services, Ltd.
InventorEdward O. Banker
Life of this patent
Estimating the term…
Abstract
A tubular connection is formed by a box member and a pin member, each of which has a tapered constant pitch thread. A profile defined by the thread of at least one of the pin member and the box member results in a pitch line that is a stepped pitch line. The stepped pitch line configuration may produce a wide radial band of substantive contact between the stab flanks of the pin member and box member upon full make-up of the connection.
Claims15
A tubular connection, comprising:
- a pin member having a tapered, constant pitch thread having a root, a crest, a stab flank and a load flank, the stab flank of the pin member thread having a base surface and a second surface, the base surface extending radially outward and away from the root at a base angle relative to radial, the second surface extending radially outward and away from the end of the base surface at a second angle relative to radial, the second angle greater than the base angle;
- and
- a box member having a tapered, constant pitch thread having a root, a crest, a stab flank and a load flank, the stab flank of the box member thread having a base surface and a second surface, the base surface extending radially inward and away from the root at a base angle relative to radial, the second surface extending radially inward and away from the end of the base surface at a second angle relative to radial, the second angle greater than the base angle;
- wherein a profile defined by the root, crest, stab flank and load flank of at least one of the pin member or the box member results in a single pitch line of the pin member or box member that is a stepped pitch line, wherein the stepped pitch line is the only pitch line for the profile and comprises:
- a first line segment passing through a first thread crest from a first point on the load flank of the first thread crest to a second point on the stab flank of the first thread crest, said first line segment being straight and uninterrupted by any discontinuity;
- a second line segment passing through a first thread groove from the second point on the stab flank the first thread crest to a third point on the load flank of a second thread crest, said second line segment being straight and uninterrupted by any discontinuity;
- said second line segment being angularly offset from said first line segment.
4 more elements
A threaded tubular member, comprising:
- an elongated body having an axial passage therethrough, an end portion of the body having a tapered, constant pitch thread having a root, a crest, a stab flank and a load flank, the stab flank having a base surface and a second surface, the base surface extending radially outward and away from the root at a base angle relative to radial, the second surface extending radially outward and away from the end of the base surface at a second angle relative to radial, the second angle greater than the base angle, wherein a profile defined by the root, crest, stab flank and load flank of at least one of the pin member or the box member results in a single pitch line of the pin member or box member that is a stepped pitch line, wherein the stepped pitch line is the only pitch line for the profile and comprises:
- a first line segment passing through a first thread crest from a first point on the load flank of the first thread crest to a second point on the stab flank of the first thread crest, said first line segment being straight and uninterrupted by any discontinuity;
- a second line segment passing through a first thread groove from the second point on the stab flank the first thread crest to a third point on the load flank of a second thread crest, said second line segment being straight and uninterrupted by any discontinuity;
- said second line segment being angularly offset from said first line segment.
1 more element
Dependencies are inferred from the claim text.