Method for surveying drill holes, drilling arrangement, and borehole survey assembly

A drilling arrangement for percussive drilling, comprising:

• a drill tool for drilling boreholes, the drill tool having at least one drill rod and a drill bit assembly;
• a borehole survey tool for measuring the borehole to obtain data of a borehole drilled by the drill tool, wherein the borehole survey tool is arranged within the drill tool;
• a data processor including a non-transitory memory for processing data of the borehole to obtain borehole status information, the drill tool including a central flushing channel for conducting flushing fluid to the drill bit assembly;
• and
• the borehole survey tool being configured for arrangement in the central flushing channel so that fluid can flow in the central flushing channel past the borehole survey tool, the borehole survey tool being suspended in the central flushing channel of the drill tool between dampers
• wherein the dampers are situated outside the borehole survey tool in the central flushing channel of the drill tool so that the dampers are configured to be exposed to flushing fluid flowing in the central flushing channel of the drill tool and so that the flushing fluid flowing in the central flushing channel of the drill tool flows through the dampers.

A borehole survey assembly for percussive drilling comprising:

• a borehole survey tool containing a sensor for collecting data of a borehole;
• and
• two dampers for suspending the borehole survey tool in a central flushing channel of a drill tool for percussive drilling between said dampers;
• wherein the dampers are situated outside the borehole survey tool in the central flushing channel of the drill tool so that the dampers are configured to be exposed to flushing fluid flowing in the central flushing channel of the drill tool and so that the flushing fluid flowing in the central flushing channel of the drill tool flows through the dampers.