Minor Time Ratio in HDD Prereaming Time in Clayey Conditions – Case Study
Horizontal Directional Drilling (HDD) is defined as “A steerable system for the installation of pipes, conduits, and cables in a short, medium, and large drive length and in a shallow, medium, and deep arc using a surfaced launched drilling rig. Traditionally, HDD was launched and growth out from the oil and well drilling construction. HDD is applied to cross obstacles such as rivers, lakes, and valleys using a rotating bit or reamer with a fluid pumped to fill the pilot hole, that then will be enlarged by a larger reamer back and forth passes to the size required (125% to 150% of product pipe size or diameter). HDD after few years of application is acceptable as the very effective technique for the installation of pipelines and other utilities in sensitive and congested areas such as train tracks, railways and stations, and airports runways. This research focuses on the activities of HDD operation, including minor activities and major activities and the percentage of minor time to major drilling time at the specific prereaming diameter. A HDD pilot project was selected to collect real life data for minor activities durations and major drilling time for prereaming on 12, 22, 26, 36, and 42 in. diameters. Then, the ratio of minor time to major drilling time was modeled. Also, models predicted for the ratio of minor time in HDD project were validated using data collected for the operation to give validation factors of 134%, 123%, 99%, 126%, 142%, and 83% for the reaming diameters 12, 22, 26, 36, and 42 in. respectively.
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