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Fast-rotation type oil drill rod joint thread reinforcing structure

A technology for oil drill pipe joints and strengthening structures, which is applied in the direction of drill pipes, drill pipes, drilling equipment, etc., can solve problems such as unreasonable thread structures of oil drill pipe joints, reduce the probability of thread fatigue cracks, and improve torsion resistance , The effect of reducing auxiliary man-hours

Inactive Publication Date: 2013-07-24
JIANGSU SHUGUANG OIL DRILLING EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention mainly aims at the unreasonable thread structure of the oil drill pipe joint in the prior art, and proposes a quick-spin oil drill pipe joint thread strengthening structure with reasonable and simple thread structure, reliable connection, high tightening efficiency and strong torsion resistance

Method used

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  • Fast-rotation type oil drill rod joint thread reinforcing structure
  • Fast-rotation type oil drill rod joint thread reinforcing structure
  • Fast-rotation type oil drill rod joint thread reinforcing structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Quick-rotating oil drill pipe joint threaded structure such as figure 1 ,Such as figure 2 As shown, it is set in the taper internal thread 1 and taper external thread 2 at both ends of the oil drill pipe joint. The tapered internal thread 1 and the tapered external thread 2 have the same specifications. This embodiment is a JST55 oil drill pipe joint with a taper of 1:16. There are three threads with the same rotation direction at both ends, and each thread is on the same cross section. 120 apart 0 . Under the premise of the same specification, the lead of the three-threaded thread is larger than that of the single-threaded or double-threaded thread. In this embodiment, the connected drill pipe can be tightened by 0.58 revolutions. This kind of quick-turning structure is simple, easy to manufacture, and connect Fast and reliable, significantly improving drilling efficiency. The tooth profile of taper internal thread 1 and taper external thread 2 are the same, the axial...

Embodiment 2

[0019] The specification of this embodiment is the JST39 oil drill pipe joint. Although the specification is smaller than that of the embodiment 1, the structure of the two is exactly the same. Only the structural parameters have been adjusted. The specific parameters are shown in the main structural parameter table of the embodiment. The technical effect of the application of this embodiment is similar to that of Embodiment 1. In order to save space, it will not be repeated.

[0020] The main structural parameter table of the embodiment:

[0021]

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Abstract

The invention discloses a fast-rotation type oil drill rod joint thread reinforcing structure which is arranged in taper internal threads and taper external threads, wherein the taper internal threads and the taper external threads are arranged at two ends of a drill rod joint. Fast-rotation connection of triple threads in the same rotation direction can be achieved, thread forms of threads with same standards are uniform, inclined surfaces on the left sides of the trapezoid-shaped thread forms are bearing sides, curved surfaces on the right sides of the trapezoid-shaped thread forms are lead-in sides, and arcs with big radius values are used on two sides for transition to form thread bottoms. The arc connecting structures reduce stress concentration, and have a significant reinforcing effect on the threads. The lead-in sides of the thread forms adopt curved surface structures which are important structural features, and the curved surfaces are circular bead type reinforcing structures and improve the anti-torsion capability of the threads. Geometrical shapes and sizes of the threads are optimized in view of a high anti-torsion demand of an oil drill rod joint, the threads are further reinforced, load bearing is evenly distributed onto each tooth, and the problems that the taper internal threads expansion and fatigue crack of the taper external threads occur are avoided, so that drilling efficiency and safety are directly improved.

Description

Technical field [0001] The invention relates to a threaded connection strengthening structure, in particular, the invention relates to a quick-rotating oil drill pipe joint threaded strengthening structure. Background technique [0002] For a long time, oil drill pipe joints commonly used internationally have been mainly manufactured according to API7-2 standards. In the 1920s, the API organization stipulated that the thread form of the drill pipe joint was V-0.65. The top and bottom of this V-shaped thread are flat, and the width of the top and the tooth is 1.651mm, and the bottom is flat. The radius of the transition angle with the tooth bearing surface r=0.381mm. This kind of sharp-angle transition structure has a large stress concentration. When the drill pipe joint is subjected to torque during the drilling process, fatigue cracks and even fracture accidents occur at the sharp corners. In response to the above-mentioned practical problems, the API organization made an impr...

Claims

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Application Information

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IPC IPC(8): E21B17/042
Inventor 马吉山张希平梅友松戴永国
Owner JIANGSU SHUGUANG OIL DRILLING EQUIP CO LTD
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