DTH opener bits QL80 reaming down the hole button bits DTH Hole Openers
Bit shank: QL80
Brand: Win Drill
Origine: China
Top sub thread: API 4 1/2″ REG
Packaging: Ply-wood box
Delivery Time: 5-30 days
Sample Order: Yes
OEM Service: Yes
Model: QL80 DTH opener bits
Down-the-hole drilling (DTH) involves the use of a drilling hammer at the bottom of a drill string. It relies on three key elements for effective hole drilling: bit loading (weight), rotation, and air. These active components work together to efficiently crush rock. As the drill string slowly rotates, the drilling hammer repeatedly strikes into the rock with power provided by compressed air driving a piston inside the hammer. DTH hammer drilling is known for its speed in rock drilling.
DTH drilling is commonly utilized in various industries such as mining (blast hole drilling), construction sites, water well drilling, and oil and gas industry.
DTH drilling offers several advantages over top-hammer drilling when it comes to larger, deeper holes in medium-hard formations. With the hammer positioned at the bottom of the hole, there is minimal power loss as the depth increases. This means that energy is not lost in the drill string and penetration rates do not significantly decline with depth—provided that back pressure does not rise significantly in the borehole. DTH drilling is most suitable for hole diameters ranging from 4–10 inches, with some exceptions.
QL80-250mm DTH opener bits 250mm reamer drill bit for 8inch DTH hammer
Hole openers are specialized drill bits used to enlarge pre-drilled bore holes. In certain work conditions, it may be necessary to increase the size of a pre-drilled hole or drill large diameter holes. Hole opener bits are specifically designed for this purpose and provide an effective means of enlarging holes, hence their name “Hole Opener”. A common practice involves initially drilling a relatively small pilot hole and then further widening it with a hole opener bit in subsequent stages. This approach can result in a straighter hole and require less powerful machinery. Different stages can be set per drilling specifications to maximize cutting, breaking, removal efficiency, and rig capabilities.
The need for large boreholes arises across various industries including hydrocarbon exploration, well drilling, horizontal excavation for tunnels among others. The process of drilling one large hole may require significant power and very large machinery; therefore it is often done in several steps. In some cases,a relatively small bit will be used initially to drill a pilot hole. This kind of drilling practice typically requires less energy than doing it in one step and can also result in a straighter borehole. After this initial pilot hole has been drilled, a hole opener can be used to widen the borehole. in such case, the result can be a more precise borehole that was created with less powerful equipment than would have been needed to drill a large hole at beginning directly. Win Drills’ DTH hole opener bits are available in reamed diameters from 130mm to 660mm (51/8″ to 26″ ) with shanks designs to fit most of the popular DTH hammers, and are manufactured in a several configuration styles to meet each particular field drilling requirements. Win Drill uses only the optimal steel in producing its’ hole openers too, which will give you hour after hour of trouble-free drilling, and with them you will always know that it was produced with the quality you have come to expect for.
DTH opener bits parameters:
| Guide Dia. | Reamed Dia. | Hammer Shank Types | ||
| mm | inch | mm | inch | |
| 80~110 | 3 1/8~4 5/16 | 130~165 | 5 1/8~6 1/2 | DHD3.5, QL30, COP34 |
| 82~115 | 3 1/4~4 1/2 | 165~178 | 6 1/2~7 | DHD340A, QL40, SD4, M40 |
| 75~138 | 2 15/16~5 3/8 | 152~216 | 6~8 1/2 | DHD350R, QL50, SD5, M50 |
| 108~296 | 4 1/4~11 5/8 | 191~381 | 7 1/2~15 | DHD360, QL60, SD6, M60 |
| 140~296 | 5 1/2~11 5/8 | 200~381 | 7 7/8~15 | DHD380, QL80, SD8, M80 |
| 305~311 | 12~12 1/4 | 444.5~482 | 17 1/2~19 | SD10, Numa10, MP100 |
| 216~444.5 | 8 1/2~17 1/2 | 312~660 | 12 5/16~26 | SD12, Numa120, DHD112 |
