Using mathematical statistical method to analyze the PDC cutter force

Coring drill bit is drilling formations, a key tool for core, coring drill merits of the quality will directly affect the quality of coring, core harvest rates and operating costs. Domestic PDC coring drill technology status compared with foreign advanced level there is a big gap, in addition to cutting the material quality of the objective reasons, the lack of scientific design theory and method is a very  abrasive grinding . This article from the PDC cutter force test to start, using mathematical statistical method to analyze the PDC cutter force and lithology, caster angle, the cutting area and the arc length of the relationship, the establishment of PDC coring bit downhole force model; while the PDC coring bit profile  polycrystalline diamond , cloth tooth design methods, downhole flow field analysis methods were studied and discussed; on this basis, in order to force the formation of a  synthetic diamond  for the center to take anti-vortex PDC core bit design methods. Developed three new PDC coring bit in field trials and achieved good results, and its faster core drilling, core harvest rate of 95% or more, has been widely promoted, to obtain a better economic and social benefits.