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Patent Searching and Data


Title:
SCREW JOINT FOR OIL-WELL PIPE
Document Type and Number:
Japanese Patent JPH10212889
Kind Code:
A
Abstract:

To uniformly compress and deform a fluororesin ring in the circumferential direction and to keep a favorable inner pressure-resistant capacity.

This screw joint for an oil-well pipe is constituted of a pin 11a provided with a male screw 11aa and a box 12a provided with a groove 12c forming a female screw 12aa. A fluororesin ring 13 is inserted in the groove 12c. A knurling 12ca is applied on the inner peripheral face of the groove 12c. A chopped part 11c with the same taper with the screw is formed at the crest of screw thread of the initial screw part of the male screw 11aa formed on the pin 11a.


Inventors:
NAGASAKU SHIGEO
OMORI AKIRA
SUMIIE HIROYOSHI
Application Number:
JP1997000018537
Publication Date:
August 11, 1998
Filing Date:
January 31, 1997
Export Citation:
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Assignee:
SUMITOMO METAL IND
International Classes:
E21B43/00; (IPC1-7): E21B43/00
Attorney, Agent or Firm:
溝上 満好 (外2名)