Insights into the radial water jet drilling technology-Application in a quarry  

作　　者：Thomas Reinsch Bob Paap Simon Hahn Volker Wittig Sidney van den Berg 

机构地区：[1]GFZ German Research Centre for Geosciences,Telegrafenberg,14473 Potsdam,Germany [2]TNO,Sustainable Geo Energy,Utrecht,The Netherlands [3]International Geothermal Centre-GZB,Lennershofstr.140,44801 Bochum,Germany [4]Well Services Group,Phileas Foggstraat 65,NL-7825 AL Emmen,The Netherlands

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2018年第2期236-248,共13页岩石力学与岩土工程学报（英文版）

基　　金：funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No.654662

摘　　要：In this context, we applied the radial water jet drilling(RJD) technology to drill five horizontal holes into a quarry wall of the Gildehaus quarry close to Bad Bntheim, Germany. For testing the state-of-the-art jetting technology, a jetting experiment was performed to investigate the influence of geological heterogeneity on the jetting performance and the hole geometry, the influence of nozzle geometry and jetting pressure on the rate of penetration, and the possibility of localising the jetting nozzle utilizing acoustic activity. It is observed that the jetted holes can intersect fractures under varying angles, and the jetted holes do not follow a straight path when jetting at ambient surface condition. Cuttings from the jetting process retrieved from the holes can be used to estimate the reservoir rock permeability. Within the quarry, we did not observe a change in the rate of penetration due to jetting pressure variations.Acoustic monitoring was partially successful in estimating the nozzle location. Although the experiments were performed at ambient surface conditions, the results can give recommendations for a downhole application in deep wells.In this context, we applied the radial water jet drilling(RJD) technology to drill five horizontal holes into a quarry wall of the Gildehaus quarry close to Bad Bntheim, Germany. For testing the state-of-the-art jetting technology, a jetting experiment was performed to investigate the influence of geological heterogeneity on the jetting performance and the hole geometry, the influence of nozzle geometry and jetting pressure on the rate of penetration, and the possibility of localising the jetting nozzle utilizing acoustic activity. It is observed that the jetted holes can intersect fractures under varying angles, and the jetted holes do not follow a straight path when jetting at ambient surface condition. Cuttings from the jetting process retrieved from the holes can be used to estimate the reservoir rock permeability. Within the quarry, we did not observe a change in the rate of penetration due to jetting pressure variations.Acoustic monitoring was partially successful in estimating the nozzle location. Although the experiments were performed at ambient surface conditions, the results can give recommendations for a downhole application in deep wells.

关 键 词：Acoustic monitoring Drilling performance TRAJECTORY PERMEABILITY Rock properties Radial water jet drilling(RJD) 

分 类 号：O3[理学—力学]