TY - JOUR

T1 - Full-scale experimental investigation of the performance of a jet-assisted rotary drilling system in crystalline rock

AU - Stoxreiter, Thomas

AU - Portwood, Gary

AU - Gerbaud, Laurent

AU - Seibel, Olivier

AU - Essl, Stefan

AU - Plank, Johann

AU - Hofstätter, Herbert

PY - 2019/2/6

Y1 - 2019/2/6

N2 - Full-scale drilling experiments (8½ in. bit size) with a high-pressure fluid jet assisted rotary drilling system were performed in hard to drill crystalline rock. Besides the development of novel drill bits and high-pressure components, an existing drilling simulator test bench was adapted to the requirements of the current tests. A total number of seventeen test runs was conducted to enable a comparison of drilling performance between state of the art drilling technique and the innovative jet assisted system. A significant increase in rate of penetration was achieved with the system. Another relevant aspect was the influence of different drilling and jetting fluids on drilling performance. The interaction of the hydraulic and mechanical rock removing processes was researched in detail and led to further conclusions about the rock destruction process. Basic and sophisticated correlations between drilling parameters were examined in order to define the favourable operational parameters for each bit type. Lessons learned during these experiments will directly be integrated in the preparation of later field tests of the enhanced system.

AB - Full-scale drilling experiments (8½ in. bit size) with a high-pressure fluid jet assisted rotary drilling system were performed in hard to drill crystalline rock. Besides the development of novel drill bits and high-pressure components, an existing drilling simulator test bench was adapted to the requirements of the current tests. A total number of seventeen test runs was conducted to enable a comparison of drilling performance between state of the art drilling technique and the innovative jet assisted system. A significant increase in rate of penetration was achieved with the system. Another relevant aspect was the influence of different drilling and jetting fluids on drilling performance. The interaction of the hydraulic and mechanical rock removing processes was researched in detail and led to further conclusions about the rock destruction process. Basic and sophisticated correlations between drilling parameters were examined in order to define the favourable operational parameters for each bit type. Lessons learned during these experiments will directly be integrated in the preparation of later field tests of the enhanced system.

UR - http://www.scopus.com/inward/record.url?scp=85061025788&partnerID=8YFLogxK

U2 - 10.1016/j.ijrmms.2019.01.011

DO - 10.1016/j.ijrmms.2019.01.011

M3 - Article

VL - 115.2019

SP - 87

EP - 98

JO - International Journal of Rock Mechanics and Mining Sciences

JF - International Journal of Rock Mechanics and Mining Sciences

SN - 1365-1609

IS - March

ER -