Experimental study on rock cutting characteristics of granite broken by impregnated diamond bit

Abstract

The characteristics of rock cuttings are important factors affecting their annulus upward return. The indoor micro drilling experiment was carried out to study the characteristics of rock cuttings produced by impregnated diamond bit breaking granite. It is found that the rock cuttings produced by broken rock show single peak distribution in a certain range, and that the distribution is related to drilling parameters such as WOB and rotating speed. To some extent, the peak particle size of cuttings increases with the increase of WOB and decreases with the increase of rotating speed. Further microscopic observation on the morphological characteristics of rock cuttings shows that the particle size of rock cuttings is basically smaller than that of original minerals, and that most of the rock cuttings are of single mineral composition. Further observation on the morphology characteristics of rock cuttings and rock surface shows that the impregnated diamond bit drilling granite is mainly in the form of volume crushing, supplemented by plastic micro cutting.

Keywords

• impregnated diamond bit
• granite
• cutting characteristics
• drilling parameters
• laboratory test