The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 06, 1989
Filed:
Jul. 30, 1987
Harry B Curlett, Dallas, TX (US);
Pangaea Enterprises, Inc., Dallas, TX (US);
Abstract
An improved drill pipe utilizing multi-conduit tubulars is provided. A seal subassembly (644) is constructed and arranged so as to receive a plurality of similar tubular conduits (626, 630). The similar tubular conduits (626, 630) are inserted into both ends of the seal subassembly (644). At one end, the tubular conduits (630) are threadably attached to the seal subassembly (644), while at the opposite end, the tubular conduits (626) are slidably attached to the seal subassembly (644). T-rings seals (674) are provided to insure sealing engagement of the tubular conduits to the seal subassembly (644). A collar (638) is provided to join a drill pipe (596) to one end of the seal subassembly (644). A lift subassembly (682) is provided to attach the other end of the seal subassembly (644) to another drill pipe (598). The seal subassembly (644) is constructed so as to allow the tubular conduits to be of strength sufficient to withstand pressure and compression forces only. Tension and torsional forces are handled entirely by the drill pipe outer casings (614, 616), the collar (638), the seal subassembly (644), and the lift subassembly (682).