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US 10,767,683 B2Granted
Thread profiles for rotary shouldered connections
AssigneeDreco Energy Services Ulc
InventorsMasoud Kalantari, Nicholas Ryan Marchand
Life of this patent
Estimating the term…
Abstract
A thread profile for rotary shouldered threaded connections uses different thread root radii for the pin thread and the box thread in order to optimize stress distribution and maximize thread contact area. The thread profile may be adapted for use in double-shouldered, two-start, taper-threaded connections to replace currently-used threaded connections such as the rotor-to-adapter connection in a downhole motor. The thread profile may incorporate an undercut buttress design.
Claims10
A rotary shouldered threaded connection comprising:
- (a) a pin element having a pin thread, said pin thread having a pin thread stab flank, a pin thread load flank, a pin thread angle that is less than 30 degrees, and a pin thread root defined by a pin thread root radius;
- and
- (b) a box element having a box thread, said box thread having a box thread stab flank, a box thread load flank, a box thread angle, and a box thread root radius;
- wherein the pin thread root radius is greater than the box thread root radius;
- wherein the pin thread root is tangent to the pin thread stab flank and the pin thread load flank;
- wherein the pin thread angle comprises a first pin thread angle extending between the pin thread stab flank and a pin thread centerline that is disposed between the pin thread stab flank and the in thread load flank and that extends orthogonal to a central axis of the pin element;
- wherein the pin thread angle further comprises a second pin thread angle that is equal to the first pin thread angle and that extends between the pin thread centerline and the pin thread load flank;
- wherein the box thread angle comprises a first box thread angle extending between the box thread stab flank and a box thread centerline that is disposed between the box thread stab flank and the box thread load flank and that extends orthogonal a central axis of the box element;
- and
- wherein the box thread angle further comprises a second box thread angle that is equal to the first box thread angle and that extends between the box thread centerline and the box thread load flank.
7 more elements
A rotary shouldered threaded connection comprising:
- (a) a pin element having a pin thread, said pin thread having a pin thread stab flank, a pin thread load flank, a pin thread angle, and a pin thread root radius;
- and
- (b) a box element having a box thread, said box thread having a box thread stab flank, a box thread load flank, a box thread angle, and a box thread root radius;
- wherein the pin thread root radius is greater than the box thread root radius;
- wherein the pin thread angle is less than 30 degrees:
- wherein the pin thread angle comprises a first pin thread angle extending between the pin thread stab flank and a pin thread centerline that is disposed between the pin thread stab flank and the pin thread load flank and that extends orthogonal to a central axis of the pin element;
- wherein the pin thread angle further comprises a second pin thread angle that is equal to the first pin thread angle and that extends between the pin thread centerline and the pin thread load flank;
- wherein the box thread angle comprises a first box thread angle extending between the box thread stab flank and a box thread centerline that is disposed between the box thread stab flank and the box thread load flank and that extends orthogonal a central axis of the box element;
- and
- wherein the box thread angle further comprises a second box thread angle that is equal to the first box thread angle and that extends between the box thread centerline and the box thread load flank.
7 more elements
Dependencies are inferred from the claim text.