WestWard Group

US 3358783 A

Dec. 1967 J. RAYNAL ETAL 3 ABRASIVE RESISTANT ELEMENTS FOR THE VENTS OF ROTATABLE DRILLING TOOLS AND METHOD OF MANUFACTURE Filed May 18, 1965 2 Sheets-Sheet 1 0 0.1000000 op o\ 8b l3 49b 15a 4a ATTORNEYS Dec. 19, 1967 RAYNAL ETAL 3,358,783

THE VENT ABRASIVE ISTAN LEMENTS FOR F ROTATABLE DR ING TOOLS AND METHOD OF MANU TURE Filed May 18, 1965 2 Sheets-Sheet 2 INVENTORS JEAN R4 YNAL SERGE A. GSTALDEB BRUNO Pamela av O 6m ,1! W ATTOgNEYS United States Patent Ofiice 3,358,783 Patented Dec. 19, 1967 3,358,783 ABRASIVE RESISTANT ELEMENTS FOR THE VENTS OF ROTATABLE DRILLING TOOLS AND METHOD OF MANUFACTURE Jean Raynal, Serge A. Gstalder, and Bruno Renard, Pau, France, assignors to Societe National des Petroles dAquitaine, Paris, France Filed May 18, 1965, Ser. No. 456,772 Claims priority, application France, June 4, 1964, 976,992; Mar. 2, 1965, 7,649 11 Claims. (Cl. 175-393) ABSTRACT OF THE DISCLOSURE A rotatable drilling tool having fluid blades of the full body or ring type with a central input conduit for thepassage of drilling fluid under pressure, a head having areas provided with cutting elements and areas without cutting elements alternating with said cutting areas, vents for distributing the drilling fluid opening on to the areas and each being connected to the central conduit; the vents being constituted by elements whose resistance to abrasion is greater than that of the matrix of the tool.

The present invention relates to improvements in rotatable drilling tools having fluid blades, as well as a method of manufacturing a drilling tool of this type.

The invention relates more particularly to rotatable drilling tools having fluid blades of the full body or ring type, comprising a central input conduit or channel for the passage of a drilling fluid under pressure, a head having areas provided with cutting elements, such as diamonds, cutting edges made of tungsten carbide, or even individual cutting blades, and areas without cutting elements, these areas alternating, and the areas without cutting elements being generally located in a rearward position with respect to the areas having the cutting elements, vents for distributing the drilling fluid arranged in the head perpendicularly to said areas, and opening out on to said area provided with cutting elements and/or on the ar