roller bit การใช้

• In 1939, after working as a Sales Engineer with Reed Roller Bit Company in fracturing and cementing.
• It is unlikely that he actually invented the two-cone roller bit, but his legal experience helped him in understanding that its patents were important for capitalizing on the invention.
• In the 1970s, outside of the oil and gas industry, roller bits using mud circulation were replaced by the first pneumatic reciprocating piston Reverse Circulation ( RC ) drills, and became essentially obsolete for most shallow drilling, and are now only used in certain situations where rocks preclude other methods.