Downhole hammer is also known as the downhole drill. A downhole hammer is an alternative tool in deep well drilling, which is a very economical method in hard formations. This tool grants the capabilities to remove rock from 18″ to 96″ diameter. This hammer is located on the end of the drill string. The hammer piston directly contacts the bit. Because the piston discharges energy directly to the bit, energy does not dissipate through the drill string as the hole deepens. This means that given adequate air, downhole drilling performance will not decrease as depth increases.

Downhole logging is the process of measuring physical, chemical, and structural properties of penetrated geological formations using logging tools. These tools are either lowered into the borehole on a wireline cable (wireline logging) or placed just behind the drill bit as part of the drill pipe itself (logging-while-drilling). The tools employ various acoustic, nuclear, and electrical measurement techniques to acquire downhole logs of properties such as sonic velocity, density, and electrical resistivity. The wireline cable provides real-time communication between the tools and the surface; logging-while-drilling tools typically record the logs in downhole memory devices, which are subsequently downloaded when the tool returns to the ship. The downhole logs are rapidly collected, are continuous with depth, and measure in situ properties.