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A Repeated Impact Method and Instrument to Evaluate the Impact Fatigue Property of Drillpipe

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Abstract

It is well known that drillpipe failures are a pendent problem in drilling engineering. Most of drillpipe failures are low amplitude-repeated impact fatigue failures. The traditional method is using Charpy impact test to describe the fracture property of drillpipe, but it cannot veritably characterize the impact fatigue property of drillpipe under low amplitude-repeated impact. Based on the Charpy impact and other methods, a repeated impact method and instrument have been proposed to simulate the low amplitude-repeated impact of downhole conditions for drillpipe. Then, a series of tests have been performed using this instrument. Test results demonstrate the drillpipe upset transition area nonhomogeneity is more severe than drillpipe body, which is the key factor that leads to washout and fracture frequently of it. As the one time impact energy increases, the repeated impact times decrease exponentially, therefore, the rotational speed has a great effect on the fatigue life of drillpipe, and it is vital to select a suitable rotational speed for drilling jobs. In addition, based on SEM fractographs we found that the fracture surface of repeated impact is similar to the fatigue fracture, and there are many low cycle fatigue characteristic features on fracture surface that reveal very good agreement with the features of drillpipe fatigue failures in the field.

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Abbreviations

OTIE:

One time impact energy, J

RIT:

Repeated impact times

n :

Rotational speed, in the oil and gas drilling engineering, the customary unit of rotational speed is r/min. (1 r/min = 0.1047 rad/s)

ω:

Angular velocity of the rotating disk, rad/s

r :

Radius of the rotating disk, m

E :

One time impact energy (OTIE), that is the energy which specimen impacts the chopping block once when the rotating disk rotates one circle, J

m :

Mass of the rotating disk, kg

N :

Cumulative impact times until specimen fractures

Q :

Cumulative impact energy until specimen fractures, J

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Acknowledgments

This work was supported by the National Natural Science Foundation and Shanghai Baosteel Group Corporation of China (Grant No. 51074135), the CNPC integrity study of OCTG (Grant No. 2011A-4208), and the Graduate Innovation Foundation of Southwest Petroleum University (Grant No. GIFSS0702).

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Correspondence to Yuanhua Lin.

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Lin, Y., Li, Q., Sun, Y. et al. A Repeated Impact Method and Instrument to Evaluate the Impact Fatigue Property of Drillpipe. J. of Materi Eng and Perform 22, 1064–1071 (2013). https://doi.org/10.1007/s11665-012-0349-2

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