Investigation of Hole Widening Drilling Using Cutting Analysis

Daiyan Ahmed, Yingjian Xiao, Jeronimo de Moura Jr., Stephen Butt

In the proceedings of: GeoSt. John's 2019: 72nd Canadian Geotechnical Conference

Session: Rock Mechanics

ABSTRACT: In narrow vein mining (NVM), mining excavation commonly transfers from open pit mining to drilling excavation based on the cost and efficiency. Mining drilling is generally conducted on the narrow vein, along with next-step excavation of hole widening drilling. In Drilling Technology Laboratory (DTL), the two stages of drilling methods are under study to assist in the NVM. Drill-off Tests (DOT) were conducted using a small drilling simulator (SDS) in laboratory. Drilling performance of pilot hole drilling and hole widening drilling were evaluated based on the following parameters: rate of penetration (ROP), torque, rotary speed. A well planned schedule was made to achieve this goal, in addition the cuttings were collected for further analysis. Cutting size analysis helps to correlate the drilling performance for varying drilling stages, i.e. pilot drilling and hole-widening drilling, and rock types. Cutting size analysis also correlates to other drilling responses such as torque, rotary speed based on the variation of previously stated parameters. A combination of cutting analysis, drilling response and drilling performance results in a detailed explanation of the hole widening drilling process. This will assist in drilling plan for hole widening operation for narrow vein mining. ABSTRAIT la veine étroite, de même que l'excavation à l'étape suivante du forage d'élargissement du trou. Au Drilling Technology Laboratory (DTL), à l'aide d'un petit simulateur de forage (SDS) en laboratoire. Les performances de forage pilote et d'élargissement de trou ont été évaluées en fonction des paramètres suivants: taux de pénétration (ROP), couple, vitesse de rotation. Un calendrier bien planifié a été établi pour atteindre cet objectif. De plus, les boutures ont été recueillies pour une analyse plus -à-dire les forages pilotes et les forages pour élargir les trous, et les types de roches. L'analyse de la taille de coupe est également corrélée à d'autres réponses de forage, telles que le couple et la vitesse de rotation, en fonction de la variation des paramètres indiqués précédemment. Une combinaison d'analyse de coupe, de réponse de forage et de performance de forage donne une explication détaillée du processus de forage d'élargissement du trou. Cela facilitera le

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