Products >> Drill Bit >> Casing Shoe

Casing Shoe

The casing shoe bit is mainly used in handling casing tube in the shallow earth surfaces, and we have casing shoes bit in different hardness to better fit various casing tube bits
The casing shoe diamond bit is mainly made up of diamond single crystal steel body, tungsten carbide and polycrystalline diamond

Main functions of casing shoe:
1): protect casing ends from distortion.
2): help casing pass through stratum to bed rock.
3): carry mud to earth surface.
4): help down-pass of casing when drill rod is in hole.

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.

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	Size	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