Development and improvement of design factors for PDC cutter bits

The process of hole making is examined. First, a pilot hole is made with formation of additional free surfaces. In further deepening of coal, cutters come into contact with core. As a result, the core column is only connected to rock mass at bottom, which facilitates core breaking and removal by wash liquid fed from hydraulic nozzle. At the same time, picks in the first row on the blade of the reamer get into contact with rock mass, break it and ream out the hole to an intermediate diameter. The further deepening of the hole goes in parallel with core breaking and hole reaming to the second intermediate diameter under the contact between the second row picks and rock mass. The process is continued until the hole is reamed to the rated diameter DH. The hole reaming up to a required size needs much less energy than the pilot hole making; for this reason, each reamer blade has only 4 PDC cutters (in accordance with the number of the blades) despite much greater volume of rock breaking. Mud cleaning is carried out using the washing system composed of channels connected to the central end-to-end channel and hydraulic nozzles mounted at the end of the pilot hole maker, internal brattice in the tube body and on the blades of the reamer.


For citation:

Ratov B. T., Fedorov B. V., Omirzakova E. J., Korgasbekov D. R. Development and improvement of design factors for PDC cutter bits. MIAB. Mining Inf. Anal. Bull. 2019;(11):73-80. [In Russ]. DOI: 10.25018/0236-1493-2019-11-0-73-80.

Issue number: 11
Year: 2019
Page number: 73-80
ISBN: 0236-1493
UDK: 622.17
DOI: 10.25018/0236-1493-2019-11-0-73-80
Authors: Ratov B. T., Fedorov B. V., Omirzakova E. J., Korgasbekov D. R.
About authors:

B.T. Ratov1, Dr. Sci. (Eng.), Professor, e-mail:,
B.V. Fedorov1, Dr. Sci. (Eng.), Professor,
E.J. Omirzakova1, Cand. Sci. (Eng.), Assoc. professor,
Caspian Public University, (Caspian University), Almaty, Kazakhstan,
D.R. Korgasbekov1, Tyutor, Master of technical science,
1 Satbayev University, 050013, Almaty, Kazakhstan.

Keywords: Drill bit, drilling, plant, bladed bit, mud, core, core breaker, blade, diamond carbide blades, mud flow channel.

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