DRILLING DIAMOND BIT FOR DRILLING A WASH FLUID ABSORPTION ZONE WITH SIMULTANEOUS WELL EXPANSION Russian patent published in 2018 - IPC E21B10/26 E21B10/43 E21B10/55 

FIELD: drilling soil or rock.

SUBSTANCE: invention relates to a rock destruction tool used for drilling oil and gas wells. Drilling diamond bit for drilling a wash fluid absorption zone with simultaneous expansion of a well comprises a threaded body for connection to a drill string, protruding above it blades, equipped with heat-resistant diamond cutters of double pressing with a minimum amount of cobalt in the upper layer, channels for the supply of drilling fluid and carbide nozzles installed at the outlet of these channels with flow diameters of not less than 16 mm. Bit body has an eccentric expansion part, on the blades of which there are diamond cutters with a negative front angle in the range of 20–25°. Diamond cutters installed on the blades of the pilot part of the hull, coinciding in the angular position with the blades of the extension part of the hull, have an anterior negative angle in the range of 15–18°. Diamond cutters installed on the blades of the pilot part of the hull that do not coincide in the angular position with the blades of the extension part of the bit body have an anterior negative angle in the range of 12–15°.

EFFECT: technical result is to expand the field of application of diamond drill bits, namely, the use of this type of bit when drilling the absorption zone of the drilling fluid with the simultaneous expansion of the well for the installation of the profile shutter, and in improving the balance of the bit by balancing the cutting forces.

1 cl, 2 dwg