Categories | Impregnated diamond drill bit |
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Place of Origin: | Hunan, China |
Brand Name: | Drilling King |
Model Number: | BW, NW, HW, PW |
Certification: | ISO, SGS |
Price: | Negotiated |
Packaging Details: | Carton |
Delivery Time: | One week |
Payment Terms: | T/T, Western Union |
Supply Ability: | 3000 pcs per month |
MOQ: | 1pc |
Processing Type: | Forging |
Crown Height: | 6mm,9mm,12mm,14mm |
Function: | Collect Deep Rock Core |
OEM Service: | Available |
Bit Crown Profiles: | "W" , "Flat" , "Semi-round", "Cross", "Gear" |
BW Casing Bits
Impregnated diamond casing shoe is the most commonly used as it has the widest range of application and is generally the most efficient tool for advancing casing through overburden layers. We have two crown types of impregnated diamond casing shoes available, flat and V-ring.
Surface set diamond casing shoe differs from the impregnated type in that they are set with a single layer of natural drill diamond in a pre-determined pattern on the working surfaces of the tool. Surface-set diamond casing shoes are recommended for use when drilling relatively soft and abrasive formations such as sandstone or limestone.
Tungsten-Carbide casing shoe set with large tungsten-carbide elements that are physically embedded into the crown of the tool. Tungsten-carbide does not possess the hardness of diamond but it is very cost effective means of drilling through softer unconsolidated formations. The application of this type of casing shoe is primarily in geotechnical soil investigation or for advancing casing tubes through overburden layers that are composed mainly of clay, sand, gypsum or soft shale.
Type | Size | Outside diameter | Inside diameter | ||
Standard Casing Shoes | Inch | Mm | Inch | Mm | |
RW | 1.475~1.465 | 37.46~37.21 | 1.188~1.183 | 30.18~30.05 | |
EW | 1.880~1.870 | 47.75~47.50 | 1.497~1.492 | 38.02~37.90 | |
AW | 2.350~2.340 | 59.69~59.44 | 1.902~1.897 | 48.31~48.18 | |
BW | 2.970~2.960 | 75.44~75.19 | 2.377~2.367 | 60.38~60.12 | |
NW | 3.620~3.610 | 91.95~91.70 | 2.997~2.987 | 76.12~75.87 | |
HW-CDDA | 4.632~4.617 | 117.65~117.27 | 3.930~3.920 | 99.82~99.57 | |
HW-DCDMA | 4.632~4.617 | 117.65~117.27 | 3.980~3.970 | 101.09~100.84 | |
HWT | 4.632~4.617 | 117.65~117.27 | 3.930~3.920 | 99.82~99.57 | |
PW | 5.660~5.640 | 143.76~143.26 | 4.865~4.850 | 123.57~123.19 | |
PWT | 5.660~5.640 | 143.76~143.26 | 4.865~4.850 | 123.57~123.19 | |
SW | 6.800~6.780 | 172.72~172.21 | 5.948~5.933 | 151.08~150.70 | |
UW | 7.815~7.785 | 198.50~197.74 | 6.916~6.896 | 175.67~175.16 | |
ZW | 8.825~8.795 | 224.15~223.40 | 7.987~7.967 | 202.87~202.36 | |
Metric Casing Shoes | 46mm | 1.818~1.808 | 46.18~45.92 | 1.462~1.452 | 37.13~36.88 |
56mm | 2.210~2.200 | 56.13~55.88 | 1.855~1.845 | 47.12~46.87 | |
66mm | 2.603~2.593 | 66.12~65.87 | 2.249~2.239 | 57.12~56.87 | |
76mm | 2.997~2.987 | 76.12~75.87 | 2.643~2.633 | 67.13~66.88 | |
86mm | 3.391~3.381 | 86.13~85.88 | 3.037~3.027 | 75.14~76.89 | |
101mm | 3.985~3.970 | 101.22~100.84 | 3.460~3.445 | 87.88~87.50 | |
116mm | 4.575~4.560 | 116.20~115.82 | 4.063~4.048 | 103.20~102.82 | |
131mm | 5.165~5.150 | 131.19~130.81 | 4.700~4.685 | 119.38~119.00 | |
146mm | 5.755~5.740 | 146.18~145.80 | 5.244~5.229 | 133.20~132.81 | |
Standard Casing Shoes (For use with DCDMA and CDDA Standard Casing) | BW | 2.970~2.960 | 75.44~75.19 | 2.220~2.210 | 56.39~56.13 |
NW | 3.620~3.610 | 91.95~91.70 | 2.845~2.835 | 72.26~72.00 | |
HW | 4.632~4.617 | 117.65~117.27 | 3.782~3.772 | 96.06~95.81 | |
Wide-Kerf Casing Bits (For use with DCDMA and CDDA Standard Casing) | BW (NWL) | 2.970~2.960 | 75.44~75.19 | 1.880~1.870 | 47.75~47.50 |
NW (HWL) | 3.770~3.755 | 95.76~95.38 | 2.505~2.495 | 63.63~63.38 | |
HW (PWL) | 4.815~4.795 | 122.30~121.80 | 3.350~3.340 | 85.09~84.84 | |
British Standard BS879 Water Well Casing Shoes | 4 inch | 4.635~4.615 | 117.73~117.22 | 3.824~3.809 | 97.13~96.75 |
5 inch | 5.660~5.640 | 143.76~143.26 | 4.833~4.813 | 122.75~122.25 | |
6 inch | 6.800~6.780 | 172.72~172.21 | 5.833~5.818 | 148.15~147.75 | |
8 inch | 8.835~8.815 | 224.41~223.90 | 7.835~7.815 | 199.01~198.50 | |
10 inch | 10.940~10.920 | 277.88~277.37 | 9.825~9.805 | 249.56~249.05 |
Note: The above size is only for reference and non-standard set diameters and may be available on request.