"REPORTER of the Association of Drilling Contractors" N 4, 2012

SELECTING THE SCHEME OF MUD CIRCULATION THROUGH ROLLER CUTTER BITS IN VARIOUS DRILLING CONDITIONS
Alexander M. Gusman - Dr.Tech.Dci., professor, head of department, OJSC NPO Burovaya Technika, alevina@integra.ru


Key words: bottomhole cleaning process, grindability of cuttings, scheme of mud circulation through drill bit, oriented jet nozzle, asymmetrical circulation schemes, packing, operating parameters, hydromechanical breaking of rocks, physical-mechanical properties of rocks.
The  paper  shows  that  successful  bottomhole  cleaning  while  drilling  should  be  based  on individual control of each of the three processes, namely, bottomhole face cleaning, bottom hole zone cleaning and bit cutting structure cleaning. Each process may have different or zero effect on drilling performance in different drilling conditions. Based on test findings and different drilling conditions, the author provides methods for the selection of a scheme of mud circulation through roller cutter bits and the bottomhole. It is also shown that the circulation scheme should suit the bit cutting structure.



 

 

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