| Comparison of liquid-driven hammer drilling process and air DTH
hammer drilling process |
| DTH-HAMMER | COMMAND liquid-driven hammer |
| Applicable strata |
| Complete bedrock formation, or hard rock | Like the DTH-hammer, the crushing efficiency is extremely high for
hard formations. |
| Unsuited Stratum | The mud acts as a medium for the impactor, essentially mud
drilling. Mud drilling is suitable for a variety of formations. And
the wall protection ability is strong, it is not easy to collapse,
and the fractured formation can also be processed by filling. |
| Sandy soil layers, fractured strata and other loose formations,
when loose formations will blow up the walls of the holes, or blow
into small "big bells", if the air compressor model is not well
matched, it will cause drill cuttings at the bottom of the hole.
Suspended in the wellhead, can not blow out, resulting in buried
bottom and other hole bottom accidents. | |
| Matching equipment |
| Drilling rig | Drilling rig |
| Generally hydraulic power head drill | The rig can be in various forms, and the COMMAND uses a truss
structure, which is a high-strength square tube welding, has a high
load and good torsion resistance, and is suitable for various
aperture construction. The drilling diameter is 505MM. |
| The rig is a combined I-beam or channel steel structure that is
lightweight but does not have torsion resistance. Therefore, it is
only applicable to the air DTH hammer drilling process which does
not require a large torque, and the general aperture can only reach
within 200MM. |
| Air compressor | Mud pump |
| Selection basis: | Selection basis: |
| Air flow: annular gap between drill pipe and hole wall (aperture) | Flow: Ring gap between drill pipe and hole wall (aperture) |
| Wind pressure: depth | Pressure: Depth |
| Commonly used air compressors can only reach a depth of about 280
meters, the deeper the cost is, the higher the cost is. | Mud pump is the basic component of drilling rig. Because of the
ever-changing strata, mud drilling must be used to solve complex
strata. |
| The selection of mud pump only needs to be based on the depth and
aperture of normal mud drilling. |
| Common working conditions: | Common working conditions: |
| Aperture: 168MM Depth: 200M | Aperture: 311MM Depth: 300M |
| Air compressor parameters: | Mud pump parameters: |
| 29m³/min 2.4MPA | 1200L/MIN 4MPA |
| Price: Domestic: 390,000 | Price: 75,000 |
| Import: 870,000 | |
| Common working conditions: | Common working conditions: |
| Aperture: 168 MM Depth: 600M | Aperture: 311MM Depth: 600M |
| Two air compressors: 39m³/min 2.5MPA | Mud pump parameters: |
| A supercharger: 61m³/min intake: 2.4MPA exhaust: 6.9MPA | 1200L/MIN 8MPA |
| Set Price: Domestic: 3,540,000 | Price: 180,000 |
| Imports: 4,960,000 | |
