Pioneering renewable energy technology

GeoVolve HAMMER is a percussion hammer drilling system for use in geothermal and conventional wells where percussive impact on the drill bit enhances the rate of penetration (ROP) whilst drilling.


  • Geothermal drilling in basement, volcanic or high compressive strength rock
  • O&G drilling in hard rock environments
  • CCS drilling
  • ERD applications with limited weight on bit

Operating Principle

GeoVolve HAMMER uses GeoVolve INFINITY to drive a percussion hammer to strike an anvil at high speed. The anvil is connected immediately onto the drill bit. The force of the anvil strike is transmitted through the bit into the rock where the percussive impulse force causes compressive failure of the rock structure.

GeoVolve HAMMER is a simple plug-and-play device which connects directly to the bit in any BHA configuration. It is very simply powered by the flow of conventional drilling fluid – yet introduces a negligible pressure drop and no restriction to flow. GoeVolve HAMMER features an uninterrupted through-bore.

GeoVolve HAMMER requires no complex surface control systems, does not rely on compressed air or complicated cross-flow fluid systems and operates automatically and autonomously.

GeoVolve is designed as a hostile service tool and as such is designed without elastomeric seals for use in ultra-hot well environments – particularly geothermal wells.

  • Geothermal drilling ‘enabling’ technology
  • Huge ROP gains in hard rock
  • Extends bit life in hard rock
  • No elastomeric seals – UHP/UHT
  • Simple plug-and-play installation
  • Automatic operation
  • Compatible with any mud/fluid
  • Reduces WOB requirement
  • Improves weight transfer to bit
  • Minimal pressure drop
  • Fast acting
  • Simple robust construction
  • Reduces stick-slip dynamic
  • Maintains bit contact
  • Full bore
  • Reduces high frequency vibration
  • No specialist personnel required

Download Datasheet

Technical Features

Premium Connection

GeoVolve HAMMER can be dressed with any standard or premium Box or Pin connection to ease integration into the BHA.

Fluted Non-rotating Sleeve

The fluted non-rotating sleeve provides lateral stability to the GeoVolve HAMMER whilst also indexing the percussion valve system.

GeoVolve INFINTY Valve Module

The GeoVolve INFINITY Valve module directs and commands the fluid power required to generate the percussive impact. GeoVolve INFINITY uses the bit rotation to open and close the inlet and exhaust valves to allow pressurised fluid within the drill string to propel the percussive HAMMER mass.


The Piston provides the motive force to the GeoVolve HAMMER to generate the HAMMER acceleration for impact.


The HAMMER is the simple robust mass that is accelerated by the piston to strike the anvil to generate the impulse.


The Anvil provides the point of impact for the HAMMER and transmits the impact energy from the HAMMER strike directly into the drill bit.


A robust drive spine allows transmission of torque to the bit whilst also transmitting the all-important percussive impact force.

Premium Connection

GeoVolve HAMMER can be dressed with any standard or premium Box or Pin connection to ease integration into the BHA.