Varel International Ind., L.p.

Armines

Varel Europe

Hedi Sellami

Alfazazi Dourfaye

Christophe Simon

Christophe Colin

Elodie Sorlier

A process is presented which produces at least one block of dense material constituted by hard particles dispersed in a binder phase, it being possible for the dense material to be enriched locally with binder phase by imbibition. The process includes bringing at least one imbibition area of a surface of the block, preferably coated with a coating material, into contact with an imbibiting material which locally enriches the block with binder phase. The block in contact with the imbibiting material is then subjected to a suitable thermal cycle constituted by heating, temperature maintenance and cooling. This serves to bring some or all of the imbibiting material and the binder phase of the block into the liquid state in such a manner that the enrichment with binder phase takes place solely through the imbibition area. The block is used in connection with the building of a drill bit or tool.

Process for the production of an element comprising at least one block of dense material constituted by hard particles dispersed in a binder phase: application to cutting or drilling tools

The invention concerns a self-penetrating drilling method and a thrust-generating tool: the tool comprises N blades. Each blade comprised K drill cutters. The shapes, positions and orientations of said drill cutters are determined in the following manner: the kdrill cutter of the last blade drills, at the (q&#x2212;1)of the tool rotational cycle, a cut in the rock downstream of the one produced by the (k+1)drill cutter of the first blade at the qrotational cycle of the tool; the kdrill cutter of the nth blade drills, at the qrotational cycle of the tool, a cut in the rock downstream of the one produced by the kdrill cutter of the (n+1)blade at the qrotational cycle of the tool; the normal to the leading edge of the drill cutter has a component along the axis of rotation oriented towards upstream.

Self-penetrating drilling method and thrust-generating tool for implementing same

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Montrouge, France

Hedi Sellami