EFFICIENT AND COMPREHENSIVE DRILLING TECHNOLOGY ALTERNATIVE AIR DTH
HAMMER
1. Our products can use various drilling technologies, such as mud
drilling, air DTH drilling, air lift reverse circulation drilling,
etc
2. Mud drilling is applicable to all kinds of formation conditions
and is a universal drilling technology. With the progress of the
times, air DTH hammer drilling has gradually emerged
3. Advantages of mud drilling:
(1) Strong wall protection ability to avoid accidents at the bottom
of the hole to the greatest extent
(2) Not affected by depth
(3) Not affected by the formation
4. Air DTH hammer has great limitations, its disadvantages are as
follows:
(1) High air compressor price, high fuel consumption, high
maintenance cost
(2) Only for hard rock stratum, the harder the stratum is, the
higher the efficiency is. However, once encountering soft sand or
clay stratum, the hole will collapse or other drilling accidents
will occur.
5. In order to combine the advantages of mud drilling and air DTH
hammer, we have developed a liquid driven DTH hammer, which has the
following advantages:
(1) Use mud as the medium to drive the impactor to avoid damage to
the impactor due to high temperature and have enough lubrication
(2) Because mud is used as medium, it has strong wall protection
capacity and provides safety
(3) It has the same impact principle as air DTH hammer, and has
excellent crushing capacity for rock
Conclusion: liquid driven DTH hammer is the trend of drilling
industry
| 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.
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. |
| Unsuited Stratum |
| 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 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. | 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. |
| Air compressor | Mud pump |
Selection basis:
Air flow: annular gap between drill pipe and hole wall (aperture)
Wind 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. | Selection basis:
Flow: Ring gap between drill pipe and hole wall (aperture)
Pressure: Depth
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:
Aperture: 168MM Depth: 200M
Air compressor parameters:
29m³/min 2.4MPA
Price: Domestic: 390,000
Import: 870,000 | Common working conditions:
Aperture: 311MM Depth: 300M
Mud pump parameters:
1200L/MIN 4MPA
Price: 75,000 |
Common working conditions:
Aperture: 168 MM Depth: 600M
Two air compressors: 39m³/min 2.5MPA
A supercharger: 61m³/min intake: 2.4MPA exhaust: 6.9MPA
Set Price: Domestic: 3,540,000
Imports: 4,960,000 | Common working conditions:
Aperture: 311MM Depth: 600M
Mud pump parameters:
1200L/MIN 8MPA
Price: 180,000 |
| Other |
Daily use cost:
Fuel consumption: Because of its working principle, screw air
compressor is basically driven by diesel engine, and must be a
high-powered diesel engine, which consumes a lot of fuel in daily
use.
Maintenance: Because of the high precision of screw air compressor,
air filter and screw oil must be selected with better
specifications, and must be replaced regularly, with higher cost.
Accessories: Accessories are expensive.
Operation: There are many electronic components, such as electronic
control, and many fault points.. | Daily use cost:
Fuel consumption: no different from normal drilling
Maintenance: Normally replace the fragile parts of the mud pump.
Accessories: Low Price of Parts and Components
Operation: Simple mechanical operation, low failure rate |
