Metallurgical failure analysis of twisted-off heavy weight drillpipe

Ahmed, Mohamed Hussien; El-Zomor, Mohamed A.; Khafagi, S.; Elhelaly, M. A.

doi:10.1016/j.engfailanal.2020.104531

Cited by 4 publications

(3 citation statements)

References 11 publications

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“…Ahmed et al (2020) investigated a twisted-off failure specimen of heavy weight drill pipe (HWDP) though macro and micro tests. Their research showed that the HWDP failed by a corrosion fatigue mechanism [11].…”

Section: Introductionmentioning

confidence: 99%

Failure Analysis of Drill Pipe during Working Process in a Deep Well: A Case Study

2022

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The failure of a 101.6 mm drill pipe was studied by combining experimental testing and finite element simulation. The macro analysis, metallographic structure and energy spectrum, chemical composition and a mechanical property test of the failed drill pipe sample were firstly carried out. Then, a three-dimensional finite element model of drill pipe failure was established based on the experimental results. Finally, the failure mechanism of drill pipe was analyzed and the mitigation measures were put forward. The results showed that solids settling sticking was the direct cause of fracture failure of the drill pipe joint. Due to the violent friction and wear between the drill pipe joint and the settled sand, the large amount of heat generated caused the microstructure of the joint material to undergo phase transformation and the bearing capacity to be reduced. Finally, fracture occurs under tensile and torsional loads.

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Section: Introductionmentioning

confidence: 99%

Failure Analysis of Drill Pipe during Working Process in a Deep Well: A Case Study

2022

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“…10,11 Friction welding (FW) technology has been widely used in manufacture of carbon steel drill pipes. [12][13][14] Recently, it has also been applied in the manufacture of titanium drill pipes. 15,16 However, under the harsh drilling environment, FW of titanium drill pipes might pose a potential risk because its microstructure and mechanical properties may change during the FW process.…”

Section: Introductionmentioning

confidence: 99%

“…Friction welding (FW) technology has been widely used in manufacture of carbon steel drill pipes 12–14 . Recently, it has also been applied in the manufacture of titanium drill pipes 15,16 .…”

Section: Introductionmentioning

confidence: 99%

The effect of friction welding on the mechanical properties and corrosion fatigue resistance of titanium alloy drill pipe

Mou

Lian

et al. 2021

Fatigue Fract Eng Mat Struct

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Titanium alloys are the best candidates to replace steels for drill pipes in horizontal wells. However, friction welding (FW) may significantly change the properties of titanium alloy drill pipes. In this work, the microstructure, tensile and impact mechanical properties, and corrosion fatigue performance of the FW zone were compared with those of the base alloy. The results show that the base material is mainly composed of equiaxed globular α (hcp)‐Ti, while the acicular α + β (bcc)‐Ti is dominant in the FW zone. Due to these differences in microstructure, the FW zone has higher strength but lower stiffness and toughness than the base alloy. In addition, the fatigue performance and corrosion resistance of the material decrease in drilling fluid. These results indicate that FW zones in titanium alloy drill pipes might be the weakest region where crack, fracture, and corrosion are more likely to occur.

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