AN ANALYTICAL ELUCIDATION OF THE INFLUENCE OF SURFACTANT ON ROCK DRILLING BY SHEAR DRAG BIT/

Citation
Av. Staroselsky et K. Kim, AN ANALYTICAL ELUCIDATION OF THE INFLUENCE OF SURFACTANT ON ROCK DRILLING BY SHEAR DRAG BIT/, Rock mechanics and rock engineering, 30(3), 1997, pp. 145-159
Citations number
19
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Geosciences, Interdisciplinary","Engineering, Civil
ISSN journal
0723-2632
Volume
30
Issue
3
Year of publication
1997
Pages
145 - 159
Database
ISI
SICI code
0723-2632(1997)30:3<145:AAEOTI>2.0.ZU;2-9
Abstract
We explain analytically the effects of surfactants on the enhancement of drilling rates in rock. We propose that the weakening effect is not simply due to the chemical action of the surfactant, as suggested by Rebinder in the 1930's but to a combination of mechanical and chemical interactions. We apply a fracture mechanics approach to elucidate sur factant-assisted drilling. An analysis of the chip formation process d uring rock cutting by a shear/drag bit has shown that the surfactant-i nduced damage zone develops in rock primarily in front of the individu al bit, and its size can be as much as twice the thickness of the remo ved chips. This analysis allows us to estimate the influence of surfac tants on cutting forces.