DRILL STRING ROD AND DRILLING SYSTEM Russian patent published in 2023 - IPC E21B17/42 

FIELD: drilling.

SUBSTANCE: group of inventions relates to drill string rods for application with drill bits for percussion rock drilling. Drill string rod is used to form part of the configuration of the connected drill string rods. The drill string rod comprises: a central rod section extending axially between the male end and the female end. The central rod section herein is a hollow cylinder formed by a first inner diameter and a second outer diameter. The male end comprises a nipple, wherein the nipple comprises a base protruding axially from the shoulder, which separates the nipple and the central rod section axially. The female end comprises a coupling section configured to fit tight against the nipple, wherein the base is equipped with an external thread and wherein the coupling section is equipped with an internal thread matching the external thread so that the internal thread of the coupling section is configured to be screwed together with the external thread of the base of the nipple of the connected drill string rod of the configuration. In the radial plane up to the longitudinal axis of the drill string rod, the nipple base is formed by a third outer diameter and a fourth inner diameter, and the coupling section is formed by a fifth outer diameter and a sixth inner diameter. The second diameter herein is >60 mm and the six above diameters are selected within preset limits.

EFFECT: higher reliability and durability of large-sized drill string rods for the efficient washing of the drilled rock.

9 cl, 4 dwg, 1 tbl