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Analytical and experimental study on PDC drill bits quality

Yahiaoui, Malik and Gerbaud, Laurent and Paris, Jean-Yves and Delbé, Karl and Denape, Jean and Dourfaye, Alfazazi Analytical and experimental study on PDC drill bits quality. (2011) In: 3rd European Conference on Tribology (ECOTRIB 2011), 7 June 2011 - 9 June 2011 (Vienna, Austria).

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Abstract

Under geological extreme conditions, polycrystalline diamond compact bits (PDC) are a relevant choice because of their interesting drilling performances. In this way, the quality of innovating PDC bits materials has to be determined with accuracy by measuring cutting efficiency and wear rate, both related to the overall mechanical properties. A lathe-type test device was used to proceed to the first experiments. During these tests, cutters have been worn over an abrasion length greater than 15 km, with a mean normal load range from 3000 to 5000 N, a cutting speed about 1:8 m/ s and a penetration depth close to 2 mm. Analyses are based on models establishing coupled relations between cutting and friction stresses related to the drag bits excavation mechanism. In this work, models are implemented in order to evaluate cutting efficiency and to estimate the life time of the diamond insert. A variety of cutters was characterized by wear rates ranged from 9.4•10^(-15) to 1.1•10^(-13) mm^3/(Nm) (Archard’s model) and cutting efficiencies at 10 km evaluated between 31 and 55%. From here, an original approach is developed to describe the overall cutter quality by defining a ratio between efficiency and wear. The reference samples during preliminary tests clearly revealed various mechanical behaviors due to changes in the material composition and distinct manufacturing production methods. These changes are detected at several levels: coatings, grain sizes, surface roughness, etc.

Item Type:Conference or Workshop Item (Paper)
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Other partners > Mines ParisTech (FRANCE)
Other partners > Varel Europe (FRANCE)
Laboratory name:
Funders:
Agence Nationale de la Recherche
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Deposited On:24 Sep 2014 13:44

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