STATISTICAL ANALYSIS OF DRILL PIPE FAILURES OF STRENGTH GROUPS G-105

Authors

  • R.S. Hrabovskyi Ivano-Frankivsk National Technical University of Oil and Gas
  • V.V. Tyrlych Ivano-Frankivsk National Technical University of Oil and Gas
  • A.O. Vytiaz Ivano-Frankivsk National Technical University of Oil and Gas

DOI:

https://doi.org/10.31471/2304-7399-2022-17(64)-190-201

Keywords:

drill pipes, drill strings, operational defects.

Abstract

Characteristic types of operational defects which formed on the inner or outer surface of drill pipes of strength group G-105 are described. The results of technical diagnostics were used when drilling wells in the territory of the Dnipro-Donetsk gas-oil-bearing region. In 2018-2019, the Ukrburgaz Drilling Department rejected 89 drill pipes of strength group G-105 when drilling wells at a depth of 4,000 to 6,000 meters.

A statistical evaluation of operational defects discovered during drilling deep wells (4-6 km) was carried out. Potentially dangerous areas in the drill pipe upset zone, the length of the drill string, and the duration of drilling operations were determined.

It is recommended that, when performing defectoscopy of drill string pipes, increased attention should be paid to the section of the pipe from coupling face or nipple, in the range from 0.55 to 0.63 m. In addition, taking into account the depth of drilling, increased attention should be paid to the diagnosis of pipes their placement, since in the interval from 0.43 to 0.52 along the relative length () of the drill string, there is the greatest probability of an operational defect. It is also necessary to pay attention to the duration of drilling operations, in particular, two stages of drilling are distinguished: Stage I – stable operation (up to 6 thousand hours); and the II stage - accelerated destruction (from 6 thousand hours and more), and it was established that during the defect inspection of the pipe, special attention should be paid to drilling pipes, the duration of operation of which in the I stage is from 2692 to 3736 hours, and in the II stage - from 8744 to 10983 hours, since in these periods there is the greatest probability of an unacceptable defect.

References

Інформаційний бюлетень про аварії, ускладнення і брак в роботі під час буріння свердловин в БУ „УКРБУРГАЗ” за 2018 рік.

Інформаційний бюлетень про аварії, ускладнення і брак в роботі під час буріння свердловин в БУ „УКРБУРГАЗ” за 2019 рік.

Механіка руйнування і міцність матеріалів: довідн. посіб. / за заг. ред. В. В. Панасюка. – Том 10: Міцність та довговічність нафтогазового обладнання / В.І. Похмурський, Є. І. Крижанівський, В. М. Івасів [та ін.] – Львів-Івано-Франківськ: Фізико-механічний інститут ім. Г.В. Карпенка НАН України; Івано-Франківський націон. техн. ун-т нафти і газу, 2006. – 1193 с.

Moradi S., Ranjbar K. Experimental and computational failure analysis of drillstrings. Engineering Failure Analysis. 2009. Vol. 16, Is. 3. P. 923933.

Lu S., Feng Y., Luo F., Qin C., Wang X. Failure analysis of IEU drill pipe wash out. International Journal of Fatigue. 2005. Vol. 27. Р. 13601365.

Bertini L., Conti P. Fatigue crack growth behaviour of four structural steels in air and in a geothermal fluid environment. International Journal of Fatigue. 1992. Vol. 14. N 2. Р. 7583.

Liu Y., Li F., Xu X, Yang B., Lu C. Simulation technology in failure analysis of drill pipe. SREE Conference on Engineering Modelling and Simulation (CEMS 2011). Procedia Engineering. 2011. Vol. 12. P. 236-241.

Li Fangpo. Investigation on impact absorbed energy index of drill pipe. Engineering Failure Analysis. 2020. Vol. 118. doi:10.1016/j.engfailanal.2020.104823.

Гмурман В.Е. Теория вероятностей и математическая статистика. М.: Высшая школа, 2003. – 479 c.

Cox, D. R.The theory of the design of experiments / D. R. Cox, N. Reid. p. cm. – (Monographs on statistics and applied probability; 86). Boca Raton London New York Washington, D.C. 2000. P. 314.

Kalbfleisch, J.D. and Prentice, R.L. The Statistical Analysis of Failure Time Data, 2nd Edition. John Wiley & Sons, Inc., New York, 2011. P. 462.

Published

2022-11-22

How to Cite

Hrabovskyi, R., Tyrlych, V., & Vytiaz, A. (2022). STATISTICAL ANALYSIS OF DRILL PIPE FAILURES OF STRENGTH GROUPS G-105 . PRECARPATHIAN BULLETIN OF THE SHEVCHENKO SCIENTIFIC SOCIETY. Number, (17(64), 190–201. https://doi.org/10.31471/2304-7399-2022-17(64)-190-201