Tejas Tubular Products, Inc.

G Leon Starnes

Maximo Tejeda

Terry Dobson, Jr

A casing coupling has a taper which is different from the taper of a standard API Pin. The coupling has a thread pitch diameter which is increased relative to that of a standard API coupling but which still mates with a standard API pin.

Coupling for connecting threaded tubulars

A threaded connection for tubing having a pin connection with external, tapered buttress type threads, preferably with a one inch per foot thread taper, the pin threaded portion having seven threads per inch. The connection also includes a box connection having complementary internal threads threadedly engaging the pin, the box connection having a comparable pitch and thread taper.

Threaded connection

A threaded connection for use on oil field tubular. The connection has a dual tapered thread comprising a dual helical thread having a first, straight threaded portion and a second, angled portion, the threaded connection comprising a pin connection and a box connection both of which have thread-free sections. The thread-free section on the pin and the box are comprised of frustoconical surfaces and cylindrical surfaces. The thread-free section of the pin in addition to having a frustoconical surface and a cylindrical surface has an annular, radially outwardly radiused protrusion which, when the box and the pin connection are made-up is in interference engagement with the frustoconical surface in the box.

A threaded, coupled connection having tapered, buttress-type threads, the threaded portions of the connection having a thread pitch of seven threads per inch. Preferably the pin threads of the coupled connection are pull-out threads.

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Houston, TX, United States of America

G Leon Starnes