Importance

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Abstract

A non-upset tubing section, a tubular coupling, a connection for non-upset tubing sections, and a method for connecting the non-upset tubing section and the tubular coupling are disclosed. Methods for fabricating the non-upset tubing section and the tubular coupling are also disclosed. In one embodiment, the non-upset tubing section has an outer diameter of about 23/8 inches and, in another embodiment has an outer diameter of about 27/8 inches. The non-upset tubing section also has an externally tapered threaded surface having approximately eight rounded threads per linear inch. The tubular coupling has an outer diameter of about 27/8 inches, for use with at least one 23/8 inches OD tubing section, or about 31/2 inches, for use with at least one 27/8 inches OD tubing section. The coupling also has an internally tapered threaded surface having approximately eight rounded threads per linear inch and having a pitch diameter of about 2.258 inches for use with the 23/8 inches OD tubing section or about 2.729 inches for use with the 27/8 inches OD tubing section; Each pitch diameter is measured at a plane located about 1.250 inches from a plane located at a face of the coupling. To connect the non-upset tubing section with the tubular coupling, a thread compound is applied to either or both the threaded surface of the non-upset tubing section and the threaded surface of the tubular coupling. The non-upset tubing section is then inserted into one end of the coupling, and either the tubing section or the coupling is turned relative to its mating part until the non-upset tubing section and coupling reliably connect and seal.

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First Claim