Patent ID: 8479844

Claim:
A distance holder for connection to, and rotation with, a drill string in an earth formation drilling device arranged to supply a jet of abrasive fluid for the purpose of providing a borehole by removing earth formation material through abrasion, said borehole having an axis and said distance holder having an axis of rotation and comprising a chamber that is essentially rotationally symmetric and faces the earth formation material, and a jet nozzle arranged for discharging the jet of the abrasive fluid in said chamber, said jet having a path, wherein the chamber includes a deflector positioned in the path of the fluid jet discharged from the jet nozzle, wherein the deflector comprises an inwardly facing planar deflector surface, and wherein the jet nozzle has a center line and wherein the planar deflector surface and a radial plane that includes the center line of the jet nozzle enclose a first angle that differs from 90 degrees such that colliding with the deflector surface gives the fluid jet a component in a circumferential direction.