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Patent Searching and Data


Title:
SCREW JOINT FOR OIL WELL PIPE
Document Type and Number:
WIPO Patent Application WO/2019/171899
Kind Code:
A1
Abstract:
Provided is a screw joint for an oil well pipe in which the screw length of a joint portion is made more efficient, and with which machining time and installation time are reduced. The present invention provides an integral type screw joint for an oil well pipe, including a pin, obtained by providing a male threaded portion, which is a male tapered thread, at one end of a steel pipe, and a box, obtained by providing a female threaded portion, which is a female tapered thread that mates with the male threaded portion, at one end of a steel pipe, and provided in at least one location in an outer circumferential surface side seal portion of the pipe end side of the pin and an inner circumferential surface side seal portion of the pipe end side of the box with a construction that seals a fluid by metal contact between the pin and the box, wherein a minimum value Lmin (mm) of a screw length L (mm) in a thread row of the male tapered thread and the female tapered thread is defined by formula (1), and the screw length L (mm) in the thread row satisfies formula (2). (1) Lmin=((t×(D-t))/(αt×Dt/√3))×joint efficiency (2) Lmin×1.0≤L≤Lmin×2.5

Inventors:
KAWAI Takamasa (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
YOSHIKAWA Masaki (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
TAKANO Jun (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
NAGAHAMA Takuya (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
SEKI Haruhiko (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
Application Number:
JP2019/005177
Publication Date:
September 12, 2019
Filing Date:
February 14, 2019
Export Citation:
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Assignee:
JFE STEEL CORPORATION (2-3 Uchisaiwai-cho 2-chome, Chiyoda-ku Tokyo, 11, 〒1000011, JP)
International Classes:
F16L15/04; E21B17/042
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JFE Techno-Research Corporation 7-1, Otemachi 2-chome, Chiyoda-k, Tokyo 04, 〒1000004, JP)
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