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Drill pipe with double shoulder tool joints

A tool joint, double shoulder technology, applied in the field of drill pipe with double shoulder tool joint, can solve problems such as fatigue

Inactive Publication Date: 2017-12-01
NKKTUBES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In both cases, however, fatigue issues may arise in the drill pipe body with thinner wall thicknesses, whereas the tool joints formed at the two ends of the drill pipe do not present fatigue issues

Method used

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  • Drill pipe with double shoulder tool joints
  • Drill pipe with double shoulder tool joints
  • Drill pipe with double shoulder tool joints

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0055] Figure 2A is the neck portion 33 of the externally threaded portion 30 of the drill pipe 1 with a double shoulder tool joint according to the first embodiment of the present invention along the figure 1 Partial sectional view taken along rod axis CL shown in . Figure 2B Yes Figure 2A A detailed cross-sectional view of part A in .

[0056] like Figure 2A and Figure 2B Each of the internally threaded portion 20 and the externally threaded portion 30 shown in has the thread shape of a standard threaded joint for drill pipe as defined in the API specification. In this embodiment, there is a tapered thread (e.g. , API Spec.7) is used as the external thread part 30.

[0057] like Figure 2A As shown in , the internally threaded portion 20 of the box 2 and the externally threaded portion 30 of the pin 3 are screwed into engagement with each other (ie, threaded). Through engagement, the box end face 22 of the box 2 contacts (abuts) the pin shoulder surface 31 of th...

no. 2 approach

[0078] The second embodiment of the present invention differs from the first embodiment of the present invention in that, in addition to performing the SRB processing shown in the first embodiment, the neck portion of the externally threaded portion 30 of the male joint 3 is also 33 performs SRG processing as wraparound processing.

[0079] (SRG Processing Department)

[0080] Image 6 In the neck portion 33 of the external thread portion 30 of the drill pipe 1 with a double shoulder tool joint according to the second embodiment of the present invention along the figure 1 Partial sectional view taken along rod axis CL shown in . The SRG processed portion 35 is a surrounding processed portion including at least two bent portions at the neck portion 33 of the male thread portion 30 of the pin 3 . The SRG processing 35 is a surrounding processing for stress relief.

[0081] By performing SRG processing on the portion of the neck portion 33 of the externally threaded portion 3...

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PUM

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Abstract

A drill pipe with double shoulder tool joints by which a stress concentration can be relaxed and provided with an excellent fatigue characteristic without largely changing a predetermined threaded portion shape is provided. A drill pipe (1) with a double shoulder tool joint includes a pin (3) including a male threaded portion (30) having a predetermined shape, and a box (2) including a female threaded portion (20) to be screwed with the male threaded portion (30), and a stabbing flank (41) of each of three or less consecutive proximal thread ridges on a larger-diameter side of the male threaded portion (30) and / or three or less consecutive proximal thread ridges on a smaller-diameter side of the female threaded portion (20) includes a round processed portion.

Description

technical field [0001] The present invention relates to a drill pipe with a double shoulder tool joint, and more particularly to a drill pipe with a double shoulder tool joint having a stress relief function to improve fatigue characteristics, wherein the double shoulder tool joint is suitable It is widely used in drill pipes for ground drilling, heavy drill pipes, ground pipe string drill pipes, etc. Background technique [0002] As far as the fatigue of the drill pipe is concerned, there are some regulations and constraints, and DS-1, Spec 7G in the API (American Petroleum Institute) specification, etc. are used as guidelines. For example, API Spec.7G describes the relationship between the load-bending stress as an indicator of fatigue and the allowable number of repetitions as an indicator of the possible number of revolutions. In addition, API Spec.7G proposes the following drilling conditions: the inclination angle of the well is expressed as a regional angle every 33m...

Claims

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Application Information

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IPC IPC(8): F16L15/04E21B17/02
CPCE21B17/042
Inventor 佐仓弘持福井俊彦成川知之井上朝哉宫崎刚许正宪
Owner NKKTUBES