N&N Drilling Supply PQ Diamond S.S.

Description

Surface Set Coring Bits Surface set coring bits are typically used for higher penetration rates than impregnated bits in softer formations. They utilize a single layer of natural diamonds set in a hard matrix. The diamond grade and amount of diamond play a role in operating parameters as well. Typically, driller’s use sufficient weight on bit to ensure the bit cuts freely at an acceptable penetration rate (usually 2 – 6 in/min, [5 – 15 cm/min]). In the absence of experience in the conditions to be drilled, an approximation of maximum weight on bit when using high-quality diamonds is given by the following formula: Maximum Weight on Bit (lb) = Carat Weight x Average Number of Stones/Carat x 7 Maximum Weight on Bit (kg) = Carat Weight x Average Number of Stones/Carat x 3.2 Example: NQ BIT - 16 carats, 45/55 stones/carat Maximum Suggested Weight on Bit = 16 x 50 x 7 = 5,600 lb 16 x 50 x 3.2 = 2 560 kg