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US 11,598,159 B2Granted
Coupling for connecting downhole tubulars
AssigneeSandvik Mining and Construction Tools AB
InventorAndreas Rindeskar
Life of this patent
Estimating the term…
Abstract
A coupling for connecting downhole tubulars includes a tubular body, and at least one thread of a male screw thread formed on an outer surface of the body, and a female screw thread formed in an inner surface of the body. The at least one thread has a thread-form including a crest, a root, and a pair of flanks. The crest and the root are each cambered about a respective first and second camber radius. Each camber radius is greater than an outer diameter of the coupling.
Claims16
A coupling for connecting downhole tubulars, comprising:
- a tubular body;
- a female coupling part having a female screw thread;
- a male coupling part having a male screw thread;
- and
- at least one thread of the male screw thread formed on an outer surface of the body, and the female screw thread formed in an inner surface of the body, wherein the at least one thread has a thread-form including a crest, a root, and a pair of flanks, the crest and the root each being cambered about a respective first and second camber radius along the entire length of the thread-form, and wherein each first and second camber radius is greater than an outer diameter of the coupling, wherein one of the flanks is a contact flank and the other flank is a non-contact flank when the female and male coupling parts are in compression, wherein each flank is straight, each thread-form has a centerline perpendicular to an arc of each respective camber radius, each flank has a flank angle inclined relative to the respective centerline, and each contact flank angle is greater than the respective non-contact flank angle.
2 more elements
Dependencies are inferred from the claim text.