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HOME
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ABOUT
-
PRODUCTS
- DRILLING TOOLS
- DRILLING MOTORS
- STABILIZERS
- DRILL COLLARS
- DRILLING JARS
- HYDRAULIC AGITATOR
- ANTI STICK-SLIP TOOL
- MULTIPLE ACTIVATION BYPASS VALVE
- DRILL PIPES
- NON-ROTATING PROTECTOR
- X-OVER & SUBS
- DRILL BITS
- MICRO REAMER
- FISHING TOOLS
- RELEASING SPEAR
- RELEASING AND CIRCULATING OVERSHOT
- REVERSE CIRCULATION JUNK BASKET
- JUNK SUB
- FISHING MAGNET
- SAFETY JOINT
- TAPER TAP
- DIE COLLAR
- IMPRESSION BLOCK
- DITCH MAGNET
- MILLING SHOES
- WASHOVER PIPE
- IBOPs
- KELLY VALVE
- FLOAT VALVE
- FULL OPENING SAFETY VALVE
- TOP DRIVE IBOP
- INSIDE BOP
- DROP-IN CHECK VALVE
- WELLBORE CLEANING TOOLS
- CASING SCRAPER
- NON-ROTARY CASING SCRAPER
- CASING BRUSH
- CUTTING BED IMPELLER
- STRING MAGNET
- ROTARY CASING GUIDER
- CASING CUTTER
- SECTION MILL
- WELLHEAD TOOLS
- ELEVATORS
- ELEVATOR LINKS
- POWER TONGS
- MANUAL TONGS
- SLIPS
- SPIDERS
- SPINNING WRENCH
- BUSHINGS
- DRILLING EQUIPMENTS
- MUD PUMP
- VALVE SEAT AND BODY
- PISTON
- CYLINDER LINER
- HYDRAULIC BUCKING UNIT
- JAR TESTER
- FRAC PUMP VALVE RUBBER
- FRAC PUMP VALVE BODY
- FRAC PUMP VALVE SEAT
- FRAC PUMP PLUNGER PACKING
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PRESS
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改logo产品图-corebit
Diamond Core Drill Bits
A core bit is a drilling tool with a hole through the center that removes sediment rock and allows the core pedestal to pass through the bit and into the core barrel. The Ocean Drilling Program (ODP) employs different coring systems and bits to obtain continuous cores in all types of oceanic sediments and igneous basement.
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Once a coring system is selected based on the expected lithology, the engineer determines which type of core bit to use. As coring conditions change, the coring bit can be changed in an attempt to improve the recovery and rate of penetration with that coring system. The type of bit used depends on the expected lithology and past bit performance in the area or in a similar lithology. Once a bit is removed, it is “graded” (i.e., it is examined to determine wear on the cutting structure, gauge, bearings, etc., based on industry standards) to optimize coring performance.There are three coring systems. Each uses different bottom-hole assemblies (BHA) and types of core bits
- Advanced Piston Corer (APC)
- Rotary Core Barrel (RCB)
- Advanced Diamond Core Barrel (ADCB)
Core Bit Types
Core bits are classified according to the cutting structure and type of bearings. There are five basic types of bits used based on their function or structure: drag, scraper, abrasive, roller cone, and hammer.- Drag-type bits have a flat chisel-like surface to plane away soft formations (i.e., clay and chalk).
- Polycrystalline diamond compact (PDC) bits use multiple tungsten carbide studs with artificial diamond cutting surfaces in a claw like scraping action to remove soft formations (e.g., clay and chalk) up to hard claystone and limestone.
- Diamond bits use either surface-set or impregnated diamonds to abrade (i.e., sanding-like process) hard formations like shale or basalt.
- Roller cone bits rotate cone-shaped rollers encrusted with teeth to remove soft to hard formations through a combination of scraping and crushing processes.
- Hammer bits use percussion to crush the hard rock around the core.
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