DOUBLE SHOULDER TOOL JOINT

Title:

DOUBLE SHOULDER TOOL JOINT

Document Type and Number:

WIPO Patent Application WO/2014/136139

Kind Code:

A1

Abstract:

A double shoulder tool joint, whose a sealing surface (including a pin sealing surface and a box sealing surface) is less subject to damages so that the tool joint has excellent liquid sealability when the drill pipes are interlocked and used, is provided. A double shoulder tool joint includes a box having a box access sleeve including a first contact surface perpendicular to a pipe axis, a female threaded portion having a taper relative to the pipe axis, a box backward sleeve including a second contact surface perpendicular to the pipe axis, and a pin having a pin base including a third contact surface to contact the first contact surface, a male threaded portion to be screwed and engaged to the female threaded portion, a pin nose including a fourth contact surface perpendicular to the pipe axis to contact the second contact surface. The double shoulder tool joint further includes a guard portion including a fifth contact surface provided in a tip portion of the box extended forward from the first contact surface or a sixth contact surface provided in a tip portion of the pin extended forward from the fourth contact surface.

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Inventors:

SAKURA KOJI (JP)
SATO NOBUHIDE (JP)
NARIKAWA TOMOYUKI (JP)

Application Number:

PCT/JP2013/001345

Publication Date:

September 12, 2014

Filing Date:

March 05, 2013

Export Citation:

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Assignee:

NKKTUBES (JP)

International Classes:

F16L15/04

Foreign References:

JP2012241863A	2012-12-10
JP2007530875A	2007-11-01
JP2012214863A	2012-11-08

Other References: