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Tubular threaded joint with reinforced stop

A threaded connection and tubular technology, applied in threaded connections, pipes/pipe joints/fittings, drill pipes, etc., can solve problems such as connection leakage and sealing surface position changes

Inactive Publication Date: 2003-08-20
VALLOUREC MANNESMANN OIL & GAS FRANCE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] These technologies require a large assembly torque to form a threaded connection, which is always far greater than the torque used when entering the well. If this condition cannot be met, the position of the sealing surface may change, causing the connection to leak

Method used

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  • Tubular threaded joint with reinforced stop
  • Tubular threaded joint with reinforced stop
  • Tubular threaded joint with reinforced stop

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0053] figure 1 and figure 2 A prior art threaded connection between two long steel pipes 10 and 10' is shown.

[0054] Each end of the tubes 10 and 10' carries externally threaded elements 11, 11'.

[0055] The externally threaded element 11 comprises a conical external thread 12 and is terminated on the side of its free end by a lip 18 .

[0056] Protruding lip 18 includes:

[0057] An outer peripheral surface with a taper inclined (for example) by 20 degrees relative to the axis XX of the externally threaded element

[0058] convex sealing surface 13;

[0059] a substantially laterally positioned annular male engaging surface 16 formed by the free end of the externally threaded element

[0060] Front surface composition. The convex joint surface 16 is adjacent to the convex sealing surface 13 and is connected by a toric surface.

[0061] to the convex sealing surface, the radius of curvature of the toric surface is on the order of one millimeter to avoid making ...

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PUM

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Abstract

The invention concerns a male threaded joint (1) tipped with a male lip (18)having a male seating face (13) and a male stop (14) transverse surface (16) proximate to the male seating face; and a female threaded element (21) comprising, for co-operation with the corresponding means of the male threaded element a female seating face (23) and a female stop transverse surface provided on a female shoulder and proximate to the female seating face. The annular female shoulder zone (24) which is subjected to axial compression forces resulting from the pressure of the male (16) and female (26) stop surfaces have an inner peripheral surface (27) whereof the diameter (IDB) is at least locally proximate to said female stop surface (26) smaller than the diameter (IDP) of the inner peripheral surface (17) of the male lip (18), the ratio R of said two diameters (IDB / IDP) being less than 1 but not less than 0.9.

Description

technical field [0001] The invention relates to a tubular threaded connection comprising an external thread at the end of a first tubular element screwed to an internal thread at the end of a second tubular element. Background technique [0002] Such connections are used in particular to form casing strings or production casings or drill casings for hydrocarbon or geothermal wells. [0003] Each of the externally threaded and internally threaded elements is located at one end of the elongate tube, the externally threaded element of the first tube being screwed into the internally threaded element of the other tube in order to form a complete threaded connection. [0004] Alternatively, an externally threaded connection is placed on each of the ends of long pipes connected by short pipes or couplings with two internally threaded elements on the ends of these short pipes or couplings: such two A connector between two long pipes is considered a "threaded coupling" and uses two...

Claims

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Application Information

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IPC IPC(8): E21B17/042F16L15/04F16L15/06
CPCE21B17/042F16L15/004
Inventor 西莱恩·谢斯杉野正明伊曼纽尔·瓦伦尼山本三幸
Owner VALLOUREC MANNESMANN OIL & GAS FRANCE