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Core Barrels are used to cut an annular ring in rock or concrete or reinforced concrete. The center core of the rock or concrete is usually crushed with rock auger. The most important advantage of a core barrel is that it assists to concentrate the torque and crowd force on a small ring of cutting teeth.
Different features of PDC cutters can be chosen in different wells or formations for maximizing both drill efficiency and economic
These Grand tungsten carbide insert bits are used to drill soft formation with low compressive strength and high drill ability, such as shale, clay, sandstone and soft limestone, etc.
The DTH is the abbreviation of Down The Hole and sometimes it is also called RAB in some markets, then the RAB is short for Rotary Air Blasting
Grand DTH bits are made of superior quality alloy steel which is made by Timken in U.S. Besides, all our DTH bits are using the brand "Element Six" T.C carbide which provides (the T.C buttons) for Boart Longyear
With the top quality of alloy steels imported from USA and the best carbides made in China, we produce all threaded button bits by hot press technology.
Both semi-bridge and full-bridge coupling sleeves are manufactured by Tianjin Grand.
Reaming drilling tools are used when a large diameter is needed to be reamed out after a pilot holes is drilled to a depth
Grand Rotary Grand Bits have optimally designed bearing structures and carbide inserts to withstand extreme challenge of today's mining applications.
The ultra-thick cemented carbide Grades XR08TC and XR10CC have excellent fracture toughness and heat resistance. These two Grades can be applied to the coal cutter pick and rotary cutter pick.
Compared to roller cone bits, hybrid drill bits can increase ROP, requiring less weight on bit and minimizing bit bounce.
Designed & developed according to the construction requirements and market demand, trench-less cone palm can be applied to various formations and drilling tools, achieving a full coverage of 8-1/2 to 12-1/4 inch.
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