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Friction welding type full titanium alloy drilling rod

A technology of friction welding and titanium alloy, which is applied in the direction of drill pipe, welding equipment, drill pipe, etc., can solve the problems of reduced fatigue life at the joint between the drill pipe joint and the drill pipe body, and achieve improved connection stability and strong corrosion resistance , The effect of long fatigue life

Inactive Publication Date: 2017-12-01
CNPC BOHAI EQUIP MFG +1
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  • Abstract
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Problems solved by technology

Since the drill pipe body is titanium alloy, and the titanium alloy drill pipe joint is made of alloy steel, the difference in elastic modulus between titanium alloy and alloy steel will cause relative displacement between the drill pipe joint and the drill pipe body connection section. Great bending stress will be generated, resulting in a significant reduction in the fatigue life of the connection between the drill pipe joint and the drill pipe body

Method used

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  • Friction welding type full titanium alloy drilling rod
  • Friction welding type full titanium alloy drilling rod

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Embodiment approach

[0029] Specifically, as a specific implementation of a friction-welded all-titanium alloy drill pipe provided by the present invention, the secondary friction includes setting the secondary friction pressure to 100-110 kN, setting the secondary friction time It is 18-20 s, and the secondary friction speed is 530-560 rpm.

[0030] The secondary friction stage is the main stage of the friction heating process of titanium alloy. At this stage, the temperature of the friction surface is maintained at about 1200 °C, the bonding phenomenon of titanium alloy materials is reduced, the phenomenon of molecular interaction is enhanced, and the friction surface begins to deform. Under the action, the deformed titanium alloy layer is extruded from the friction surface to form a burr and grow continuously.

[0031] Specifically, as a specific implementation of a friction-welded all-titanium alloy drill pipe provided by the present invention, the top section treatment includes setting the up...

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Abstract

The invention discloses a friction welding type full titanium alloy drilling rod and belongs to the technical field of drilling rods. The drilling rod comprises a rod body made of titanium alloy and further comprises a joint made of titanium alloy, and the rod body is connected with the joint in a friction welding mode. The friction welding type full titanium alloy drilling rod aims at reducing the whole weight, preventing the connection segment between the drilling rod joint and the drilling rod body from generating displacement and bending stress, improving the connection stability, reducing the stress concentration and prolonging the fatigue life of the drilling rod.

Description

technical field [0001] The invention belongs to the technical field of drill rods, and more specifically relates to a friction-welded all-titanium alloy drill rod. Background technique [0002] With the development of the modern petroleum industry, oil and gas drilling has put forward higher and higher requirements for drilling technology, especially for some special drilling techniques, some conventional drilling tools and equipment can no longer meet the drilling requirements. In order to meet the drilling requirements of special craft wells at home and abroad, a series of drilling tools and equipment have been developed, among which titanium alloy drill pipe is a new variety developed in recent years. Compared with conventional steel drill pipes, titanium alloy drill pipes have greater flexibility, and have the characteristics of small structural stress, fatigue resistance, corrosion resistance and light weight. Good adaptability in drilling applications. [0003] Forei...

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Application Information

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IPC IPC(8): E21B17/00B23K20/12
CPCB23K20/12E21B17/00
Inventor 陈长青王显林纪海涛王青林姜荣凯徐斌孔令楠李竹滨李齐富左斌支鹏鹏马伟华张泽龙
Owner CNPC BOHAI EQUIP MFG
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