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Tricone and PDC Bits Summary
- Tricone and PDC Bits Summary :
Tricone and PDC Bits Summary
ProDrill offers a large selection of quality tri-cone bits, bicone bits, pdc bits, drag bits, accessories for use in a wide range of drilling industries including construction, environmental/geotechnical, geothermal, HDD, mineral exploration, rotary, sonic, and more.
ProDrill offers a wide range of PDC bits in sizes up to 24". All PDC bits are fully customization to meet specific drilling requirements, depending on the formation being drilled and the equipment being used.
The hydraulics of PDC bits are designed to keep the hole clean and the bit cool, which in turn increases the ROP
and longevity of the bit.
ProDrill offers a wide selection of Step and Chevron type drag bits for use in a variety of formations. Drag bits are offered with three or four wings in sizes ranging from 2 3/4" to 26". As a general rule three wing bits offer faster penetration, whereas four wing bits offer increased durability. As a general rule three wing bits offer faster penetration, whereas four wing bits offer increased durability.
ProDrill offers a complete line of tricone bits. Tricone bits are available in new and used (re-tip and re-run) steel tooth and tungsten carbide insert, sizes from 2 1/2" to 36" for use in all formations, with any bearing/seal type, and a wide range of additional custom features. now let we explain roller cone bits as follows:
MATERIALS
there are Mill Tooth MT Tricone bits, Tungsten Carbide Inserts TCI Tricone bits,
TUNGSTEN CARBIDE INSERT DESIGN
Button bit inserts fall in two classifications: chisel and conical.
Chisel Style Button Bit
Chisel inserts are more aggressive than conical, and some designs employ a mixture of both
Conical Shaped Button Bit Inserts
Conical inserts are more domed in appearance and are used to grind formations that are more abrasive and are higher in compressive strength.
Tungsten carbide inserts are individually manufactured and then press fit into pre-drilled holes in the cone of the bit.
Although tungsten carbide inserts are the mainstay of roller cones, pdc cutters and their use in pdc bits are fast replacing them.
FLUID CIRCULATION
All rock drill bits require some type of fluid circulation. Drilling fluid may consist of water or oil, air, or foam. The circulation of drilling fluid serves several purposes, Air circulation type available for roller cone bits
BEARING TYPES
There are three main types of bearings found in tricones.
(1) Roller or open bearing.
This bearing type is commonly used in well workover ( oil welll ) applications, shallow oil and gas drilling, water well drilling and mining applications. This bearing type allows the cones to spin freely. The bearing itself consists of a row of ball bearings and a row of roller bearings. These bearings are cooled by the drilling fluid in use. A roller bearing can be repaired until the race inside the cone becomes worn too badly.
Open bearing bits are easily distinguished by its IADC code with the final number being either a 1, 2 or 3.
One1 is open bearing without shank protection,
two 2 is without shank protection and suitable for air drilling, and
three 3 is with shank protection.
(2) Sealed Roller Bearing
This bearing type is basically the same as an open bearing with the exception that there is a seal around the bearings to protect from cuttings and debris. Sealed roller bearing bits are used in mining, natural gas drilling, geothermal and some oilfield exploration. Once the seal is worn and is no longer good, the drill bit still has some life left and will perform like an roller bearing drill bit. Sealed roller bearing bits are easily distinguished through the IADC Classification
of Tricones because the final number will either be a 4 or a 5.
Four 4 denotes sealed roller bearing without shank protection,
five5 is with shank protection.
(3) Friction bearing or sealed journal bearing
This is the most commonly used bearing type for oil well and natural gas drilling. Although the cost is generally higher, this bearing type can withstand the most abuse. The roller bearings inside the cone are replaced with a floating bushing.The bearing is also grease lubricated and sealed from outside debris.Friction bearing bits are frequently used in directional drilling applications.Due to the extra wear on the shank, gage inserts are placed on the shank for extra protection.Journal bearing bits are easily distinguished by the IADC Classification System of Tricones. The final IADC number will either be a 6 or a 7.
Six 6 is a sealed journal bearing without shank protection and
seven 7 is with shank protection.
