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2005-04-05 - Colloque/Présentation - poster - Anglais - 1 page(s)

Deschamps Benoît, Tshibangu Katshidikaya , Sillen V., Da Silva N., Luyckx N., "Expermiental method to qualify impregnated materials for drilling bits" in AADE National Technical Conference & Exhibition, Houston, USA, 2005

  • Codes CREF : Sciences de l'ingénieur (DI2000), Essais destructifs (DI2831), Mécanique des roches (DI1418)
  • Unités de recherche UMONS : Génie Minier (F408)
Texte intégral :

Abstract(s) :

(Anglais) Impregnated diamond drilling bits are used mainly to drill hard and abrasive rocks. The cutting structure of these bits consists of segments made from diamond grit dispersed in a metallic bond. The composition of the segments is carefully selected to obtain a balance between self-sharpening and wear rate, allowing combination of aggressiveness and durability. A research project was carried out in collaboration between the Mining Department of the Faculté Polytechnique de Mons, Belgium (FPMs) and Security DBS (Halliburton) drill bits plant in Belgium. The project objectives were to increase the performance of these specific types of drill bits. A testing bench has been developed to simulate drilling with impregnated segments under a variety of conditions, using various technical parameters and types of rocks. To quantify performance, we used the specific energy calculated from the forces applied on the segment as measured on the testing bench. A technical optimum, corresponding to a minimum specific energy, can be determined for each segment/rock combination. Three typical segment compositions have been tested on “Marlin” rock, a South African gabbro. Measured minimum specific energies ranged from 800 to 1200 MPa, depending on the composition of the impregnated segments and depths of cut applied. Wear curves showing typical behaviours were developed and correlated with performance charts in a global-characterization approach. This experimental methodology — integrating both performance and wear aspects — will be used to optimise the compositions of the segments on the drill bits, with respect to the local lithology.