[MIS02-P02] In-situ rock strength calculated from drilling parameters. Comparison of results from various sites.
Keywords:rock strength, drilling parameters, Specific Energy
Here we present some results from offshore and onshore drilling experiments carried out in Japan, Oman and Australia. Methods such as Specific Energy (SE) and Equivalent Strength (EST) have been used to estimate in-situ rock properties, namely UCS and analyse drilling process.
Our results demonstrate that the calculated in-situ rock strength based on SE/EST methods correlates well with sonic derived UCS and core scratch derived UCS. Utilised methods also successfully detect fractures in the formation, show developing drilling dysfunctions such as vibration, and bit balling.