What are the differences between roller cone bits and diamond bits?

The roller cone bit mainly breaks the rock by knocking, crushing and shearing, while the diamond bit mainly breaks the rock by shearing and cutting, supplemented by crushing the rock, the teeth are short and the cutting edge is sharp, so the diamond The drilling pressure of the drill bit is small, the speed is high, and the displacement is small.

 

roller cone bits

 

The low drilling pressure of the diamond drill bit is conducive to anti-slant. Due to the shaft-shifting, super-top, and compound-cone structures of the roller cone bit, and the relative displacement between the roller cone and the body, the lateral displacement r’gold<r teeth. Diamond drills are better at overcoming this unbalanced lateral force, which is also conducive to anti-slant.

There are also differences in the use of diamond drill bits and roller cone bits, and the type of drill bits should be selected for different layers. Diamond drill bits should be used as much as possible under the condition of high-density drilling fluid. Before using the diamond bit, the wellbore should be smooth and clean, the performance of the drilling fluid should be adjusted, the equipment and drilling tools should be checked, and the parameters should be selected.

A single diamond bit has a long service life and thus less tripping time, but it cannot effectively drill into heterogeneous hard formations containing chert, pyrite and siliceous. Therefore, the “connection method” should be adopted, and the diamond drill bit and the roller cone bit should be used together.

(1) According to theoretical analysis and field practice, the two kinds of drill bits have their own characteristics. When selecting them, the formation and drilling fluid density should be considered to give full play to their respective advantages, and the drill bits and parameters should be optimized to achieve the best rock-breaking effect.

(2) The shearing and rock breaking of the diamond bit basically eliminates the repeated shearing of the “holding effect” caused by the teeth of the roller cone bit hitting and crushing the rock and can maintain a high ROP in high-density well sections.

(3) The light drilling pressure and high speed of the diamond drill bit are conducive to anti-slant. High rotation speed can ream the borehole and make the wellbore regular. However, the super-top, compound cone and shifting axis of the roller cone bit are not conducive to anti-deflection and straightening.

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