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Probabilistic estimate of PDC drill bit wear rate

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Category: Mining mechanics

Last Updated on Thursday, 13 November 2014 18:55

Published on Thursday, 13 November 2014 10:06

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Authors:

T.O. Pryhorovska, Ivano-Frankivsk National Technical University of Oil and Gas, Assistant Lecturer of Engineering and Computer Graphics Department, Ivano-Frankivsk, Ukraine

S.S. Chaplinskyy, Cand. Sci. (Tech.), Associate Professor, Ivano-Frankivsk National Technical University of Oil and Gas, Senior Lecturerof Engineering and Computer Graphics Department, Ivano-Frankivsk, Ukraine

Abstract:

Purpose. To develop a probabilistic model of PDC drill bit wearing estimation according to the drilling time, drill solids and instrument design.

Methodology. The method is based on the experimental data of drill bit cutter run. Drill bit cutter wear rate can be described with a probabilistic function, parameters of this function have to be defined experimentally for particular cutters and drilling conditions. For wear rate probabilistic parameters, 3 types of the models are proposed to analyze: reliability of cutters and their failure due to margin wear rate caused by one type rock drilling; reliability of cutters and their failure due to margin wear rate caused by drilling different rocks; drill bit reliability and its failure due to the margin wear rate of its cutters. Drilling practice shows that wearing of the cutters is unbalanced: central cutters are the most worn out, while the peripheral ones are not worn out, as a rule. Blunting criterion of drill bit is proposed.

Findings. The article analyses the problems of estimation of the wear rate of PDC drill bit cutters and their remaining life. Technical guaranties of PDC drill bit cutters are developed with different drilling conditions considered. Theblunting criteria of single bit cutters and whole PDC drill bit were reasoned considering cut rock characteristics, total drilling time and drill bit construction. Based on the experimental data, wearing probabilistic function was developed. The drill bit construction requirements, which provide total drilling time optimization, were defined.

Originality. The research advances of the method proposed in the paper include cutter and drill bit wearing process rationalization, as well as the development of drill bit wear criterion which allows enhancing efficiency of drill bit construction.

Practical value. A method of bit wearing probability determination depending on the drilling time, drilled rocks and bit construction was proposed. Drill bit blunting criterion was suggested.

References:

1. Shriharsha, B.R. and Ravindra, H.V. (2003), “Comparative study of tool wear estimation in drilling”, Proc. of the 11 th National Conference on Machines and Mechanisms (NaCoMM 2003). Available at: http://www.nacomm03.ammindia.org/Articles/Ana003.htm

2. Yahiaoui, M., Gerbaud, L., Paris, J-Y., Delbe, K., Denape, J. and Dourfaye, A. (2013), “A study on PDC drill bits quality”, (Author manuscript, Wear 298-299 (2013) 32-41). Available at: http://hal-ensmp.archives-ouvertes.fr/docs/00/80/53/72/PDF/Article.pdf

3. Bochkovskiy, A.M. (2005), “Stand for drilling tool performance”, Rock cutting and metal workingtools- machinery and technology of its manufacture and use, Bakul INMNAS, Kyiv, Vol. 8, pp. 56–58.

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4. Boyko, P.Ya., Boyko, S.P., Draganchuk, O.T. and Kudriavtseva, T.O. (2003), “Comparative analysis of runnings of drill bits different types”, Naukovyi Visnyk IFNTUOG, Issue 1(5), pp. 35–38.

Сравнительная оценка отработки долот разных типов (по данным БУ „Укрбургаз“) / П.Я. Бойко, С.П. Бойко, О.Т. Драганчук [и др.] // Науковий вісник ІФНТУНГ. –2003. –№ 1(5). – С. 35–38.

5. Prigorovskaya, T.A. (2011), “Statistical analysis of PDC drill bits runnings and their longevity prediction”, Oil and Gas Business, no. 3, pp. 57–72. Available at: http://www.ogbus.ru/eng/authors/Prigorovskaya/Prigorovskaya_1e.pdf

6. Potapov, O.A. and Potapov, A.G. (2000), “Drill bit effective time definition”, Stroitelstvo neftyanykh skvazhin na sushi i na more, Issue 8, pp. 8–11.

Потапов О.А. Определение эффективного времени работы долота / О.А. Потапов, А.Г. Потапов // Научно-технический журнал „Строительство нефтяных и газовых скважин на суше и на море“ – 2000. – № 8–9.– С. 8–11.

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