Harnessing geothermal energy resources via deep drilling is hampered by the elevated temperatures and pressures encountered, which destroy drill bits, requiring frequent equipment changes and incurring high operating costs. The ANCHORBIT downhole walking system was designed by geothermal technology company GA Drilling to extend drill bit lifetime in hard and abrasive formations and accelerate geothermal energy extraction at greater depths.

The ANCHORBIT system places two collar sections behind the drill bit, each with extendable pistons capable of pushing out and gripping onto the bore shaft. When the upper collar grips the bore, the lower one extends downward closer to the drill bit, and then deploys its gripping pistons to allow the upper collar to let go. and slide down to meet it.

The walking anchor system is designed to stabilize and accelerate deep drilling projects. Source: GA Drilling

This approach prevents vibrations and improves stability when drilling with rotary systems in the formations commonly encountered in deep and hot geothermal projects. In these conditions, ANCHORBIT should double the rate of penetration and bit lifetime since the tool allows for the stabilization of the bit in the wellbore and thus applies more weight to the bit. Currently, drilling in such conditions is accompanied by vibrations, a low rate of penetration and frequent replacement of bits.

The plug-and-play solution for conventional rotary drilling is expected to improve project efficiency and productivity and render more geothermal projects economically feasible.