Hard and abrasive formations like granite and basalt hold the key to scaling enhanced geothermal and super-hot rock projects. Yet these formations are notoriously difficult to drill. Conventional PDC bits wear out quickly, and attempts to drill with higher weight-on-bit trigger damaging torsional vibrations known as stick-slip. The result: slow penetration rates, excessive bit consumption, and drilling economics that make many geothermal projects unfeasible.

GA Drilling developed a novel downhole anchoring system that stabilizes drilling assemblies directly at the rock face. Unlike surface-based control systems, our technology grips the formation with precision, eliminating torsional vibrations and enabling consistent application of high weight-on-bit. This allows PDC bits to drill harder rock at greater depths while extending tool and BHA life.

The system integrates seamlessly with conventional rotary drilling and coiled tubing, and it is adaptable for advanced concepts such as closed-loop heat exchangers and super-hot EGS projects. By anchoring locally in the borehole, it removes torque transfer from the drill string, unlocking higher depth of cut without destructive stick-slip events.

Field tests in 2023 validated the anchoring system’s ability to reliably “walk” and grip while drilling up to 100 ft/hr (31 m/hr). Vibration monitoring confirmed a reduction in lateral vibrations by up to 35%, directly improving drilling efficiency and equipment lifespan.

‍

The benefits for operators are clear:

• Extended Tool Life: PDC cutters last longer under higher loads.

• Higher ROP: Increased depth of cut enables significantly faster drilling through hard crystalline rock.

• Reduced Trips: Fewer bit replacements and BHA failures cut non-productive time.

• Smarter Drilling: Future integration of downhole sensing will deliver real-time data on WOB, torque, and formation properties, enabling predictive control.

‍

By addressing one of geothermal drilling’s biggest barriers, GA Drilling’s anchoring system opens a path toward cost-effective deep and ultra-deep wells, making 24/7 geothermal a scalable and competitive renewable energy source.