Ideal Diamond Products Private Limited

This group of products is used to cut cylindrical samples of geological formations.

The core bit is part of an overall drilling system that includes a reaming shell, a core retrieval device (core barrel assembly), the drill string (rods) and the drill rig itself.

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.

The term "impregnation depth" refers to the thickness of the diamond impregnated matrix layer on a core bit crown as shown in the illustration to the right. The variable “y” is used to define the impregnation depth dimension for a particular core bit.

IDP offers many sizes of core bits with standard impregnation depths of 6 mm (0.24 inch), 9 mm (0.35 inch) and 12 mm (0.47 inch). Other customer defined impregnation depths are available on request. Unless otherwise specified, a standard 9 mm impregnation depth is supplied for most North American sizes of core bits while a standard 6 mm impregnation depth is supplied for all thin-walled metric “I”, “T”, “TT”, “T2” and “T6”-series core bits.

As the price of an impregnated core bit increases from a 6 mm impregnation depth through to a 12 mm impregnation depth, consideration should be given to the economics of selecting a particular impregnation depth. While the initial cost of a core bit with a 6 mm depth of impregnation is relatively low, the expected overall bit life will also be lower than that of a bit with a thicker impregnation depth. For this reason, a 6 mm impregnation depth is generally recommended for use in shallow drill holes or for non-Wireline applications where more frequent bit changes are not objectionable. Conversely, the higher initial cost of a core bit with a 12 mm impregnation depth is largely offset by its inherently long bit life when used to drill extremely deep holes. The cost saving benefit is realized through reduced down time on the drill rig that would otherwise be required for tripping the drill string for bit changes

IDP’s “I-Series” impregnated diamond core bits are designed to effectively drill any formation with a Moh’s hardness in the range of 4 to 8.

The impregnated diamond matrix identification system provides a simple means of determining the correct matrix type to use for your job. In general, an impregnated diamond bit with a low identifying number such as & "l-2", would be used to drill a relatively soft, fractured and abrasive formation. As the numbers increase, the matrices are intended for use in increasingly harder formations up to the highest number,
"I-12", which would be used to drill an ultra hard, highly consolidated, non-abrasive formation.

When selecting a matrix type, consideration should be given to the capabilities of the drilling equipment in terms of its ability to function within IDP’s recommended operating parameters and also to variations in geological conditions. It may be necessary to select a harder or softer matrix type than what is recommended in this matrix selection chart in order to address drilling equipment limitations.

This group of products is used to maintain the critical hole diameter and to stabilize the drilling system in the hole during operation.

The reaming shell is part of an overall drilling system that includes a core bit, a core retrieval device (core barrel assembly), the drill string (rods) and the drill rig itself.

The cutting media on the reaming shell may take the form of natural drill diamond on the I-Series type, a combination of synthetic diamond and natural drill diamond on the Heavy Duty type, or strips of tungsten-carbide deposits.

The term “set diameter” refers to the dimension of the matrix body gauge ring diameter on which diamonds (or synthetic PCD particles) and tungsten-carbide elements have been physically set in order to preserve this dimension during drilling. The specifications for set diameter tolerances to which IDP manufactures reaming shells are given in the following tables.

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.

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.

Most sizes of impregnated core bits manufactured by IDP are offered in several different waterway configurations. These various waterway configurations have the function of controlling the bit hydraulics. In addition, the different waterway configurations influence the total bit face contact area presented to the rock face and as a result, control the amount of bit load to be applied for effective penetration. Some of the following core bit waterway configurations may not be available in certain bit sizes due to the dimensional limitations of that particular bit crown