BIT Russian patent published in 2005 - IPC

FIELD: rock cutting tools, particularly bits for drilling expendable wells.

SUBSTANCE: bit comprises body with diamond matrix divided in sections by flushing channels, cylindrical cutters made of synthetic diamonds and reinforcing the sections. Synthetic diamond cutters are inclined towards body end and project in respect to the body. Synthetic diamonds are also inclined to matrix ends so that diagonal plane extending through diametrically opposite points of cutter cylinder bases and dividing the cylinder in two halves coincides with matrix plane. Synthetic diamonds have optimal dimensions of 0.07-0.14 of cutter diameter. Area of contact surface defined in matrix section is 1.8-2.4 times greater than summary areas of contact surfaces of the cutters in above section.

EFFECT: possibility to create preconditioning zone over the whole on-cycle period, elimination of matrix freezing-in, increased efficiency of cuttings removing from cutting area and, as a result, improved cutting ability of the bit along with increased mechanical drilling rate.

3 cl, 2 dwg