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Casing Bit & Casing Shoes Bit
- Casing Bit
Casing Shoe Bit - Impregnated Diamond
Casing Shoe Bit - Surface-Set Diamond
Casing Shoe Bit - Tungsten-Carbide
Casing Shoe Bit - Dimensional
Specifications
Casing Bit & Casing Shoes Bit
This group of products is used on the leading edge of a casing tube string to advance it through the overburden layer and into the bedrock by means of rotational drilling.
Depending on the range of application, the cutting media on the core bit may take the form of synthetic diamond on the impregnated type, natural drill diamond on the surface-set type, or tungsten-carbide particles or elements.
Impregnated Diamond Casing Shoe Bit
Home Products Casing Bit & Casing Shoe Bit Impregnated Diamond Casing Shoe Bit The 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. IDP manufactures impregnated diamond casing shoe Bit that may be used with all sizes of standard casing tubes.
The basic construction of these casing shoe Bit features a sintered powdered metal crown that is fused to a steel tool body or shank. The powdered metal crown is composed of two layers: the “matrix” layer which cuts the overburden and the “backing” layer which connects the matrix layer to the steel tool body and serves to support the gauge diameter protection hard materials.
Casing Shoe Bit
This economical impregnated diamond casing shoe Bit is available for use with all standard casing tube sizes and a limited number of Wireline drill sizes. The IDP ‘casing shoe Bit is intended for use in applications where the casing tubes are to be permanently left in the drill hole.
IDP casing shoe Bit are supplied with :
§ Flat-Face (Style ‘F’) crown profile.
§ Regular (Style ‘W’) waterway configuration.
§ 0.12-inch (3 mm) diamond impregnation depth.
The matrix layer on all sizes of IDP impregnated diamond casing shoe Bit contains natural diamond crystals that are uniformly distributed and embedded in a powdered metal bond. Unlike the matrix layer, the backing layer does not contain diamond crystals distributed throughout its volume. The backing layer is also composed of a powdered metal bond material and has good wear resistance properties. The exposed outside and inside gauge diameter surfaces of this layer are set with a combination of natural mined ‘kicker’ grade diamond and tungsten-carbide wear pads. These gauge setting materials assist in maintaining the critical gauge diameters throughout the life of the shoe.
SurfaceSet Diamond Casing Shoe Bit
As the name suggests, this style of casing shoe Bit 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 shoe Bit are recommended for use when drilling relatively soft and abrasive formations such as sandstone or limestone. The diamonds are embedded in a powdered metal matrix body tool crown that is fused to a steel tool body. Unlike impregnated diamond casing shoe Bit where the controlled erosion of the powdered metal tool crown is desirable to expose new diamond crystals, the metal bond matrix used for all IDP surface-set diamond casing shoe Bit is extremely tough and wear resistant. The function of the tool crown matrix body on a surface-set casing shoe Bit is to securely hold the diamonds in place throughout the operational life of the tool. IDP manufactures surface-set diamond casing shoe Bit that may be used with all sizes of standard casing tubes.
Tool Configuration
All IDP surface-set diamond casing shoe Bit are supplied with a semi-round crown profile and a Regular (Style ‘W’) canal type waterway configuration.
Diamond Quality
Unless otherwise specified, the tool face of all IDP surface-set casing shoe Bit are set with economical ‘A’ Grade natural drill diamond. Any of the other standard IDP diamond grades may be substituted on request.
In addition, the outside and inside gauge diameter surfaces of all IDP surface-set casing shoe Bit crowns are set with a natural mined ‘Kicker’ Grade diamond to assist in maintaining the critical gauge diameters throughout the life of the shoe.
Diamond Size
All IDP surface-set casing shoe Bit and rod shoes are supplied with one of three standard diamond size ranges, namely 25, 50 or 75 stones per carat (SPC). The use of diamonds smaller than the 75 SPC range is not recommended for surface-set casing shoe Bit. While it is possible to specify diamonds larger than the 25 SPC range for use on surface-set casing shoe Bit, consideration must be given to kerf width constraints in allowing for sufficient diamond coverage when using larger diamond crystals.
Tungsten-Carbide Casing Shoe Bit
This type of casing shoe Bit uses seismic grade tungsten carbide as the cutting media. Tungsten carbide does not possess the hardness of diamond and as such has a limited range of application as a drill tool cutting media. Tungsten-carbide casing shoe Bit are however a very cost effective means of drilling through softer unconsolidated formations.
Set Diameters for Casing Shoe Bit
The term “set diameter” refers to the dimension of the outside or inside diameter of the matrix body on a casing shoe Bit crown on which diamonds and/or tungsten-carbide elements have been physically set in order to preserve this dimension during drilling.
Dimensional Specifications
Product Availability
IDP is capable of manufacturing any casing shoe Bit listed in the tables below. Casing shoe Bit sizes not listed or those with non-standard set diameters may be available on request. The range of product availability by casing shoe Bit type is given in the tables below.
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