Factors Affecting Penetration Rate
{"Image DocumentName": "Factors Affecting Penetration Rate", "Image ImageDescription": "Effecting of Bit Type. For rolling cutter bits, the initial ROP is often highest in a given formation when using bits with long teeth and a large cone offset angle. However, these bits are practical only in soft formations because of a rapid tooth destruction and decline in penetration rate in hard formations. Drag bits are designed to obtain a given penetration rate. Drag bits give a wedging type rock failure in which the bit penetration per revolution depends on the number of blades and the bottom cutting angle. The diamond and PCD bits are designed for a given penetration per revolution by the selection of the size and number of diamonds or PCD blanks.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}