Wireless HDD crossings in Alberta: accurate and efficient

HDD contractor Complete HDD was responsible for the trenchless installation of this pipeline section. They were looking to use a wireless steering tool to guide the pilot bore, in order to drill more efficiently without having to reconnect a wireline on each new drill pipe.

However, since the project took place within a busy Right-of-Way near other active pipelines, the project did require accuracy in the pilot phase. Brownline Canada offered the ideal combination of accuracy and wireless functionality with the Drillguide Wireless Steering Tool.

The three crossings had lengths ranging from 283 m to 372 m (928–1220 ft). Each bore required crossing a small creek. Additionally, all crossings included horizontal curves to keep within the Right-of-Way boundaries, and the pilot bores had to be drilled within strict radius tolerances. The accuracy and expertise of Brownline’s steering service was the key to meet these demands and execute the HDDs properly.

On two of the three crossings, the Drillguide Wireless Steering Tool was augmented with an additional modular battery pack. This ensured the wireless guidance remained active for longer periods, and reduced standstills to recharge the tool’s battery.

Secondary verification of the drill trajectory was carried out from surface level at regular intervals. The combination of different measurement techniques helps to eliminate deviations and maximize accuracy. Secondary verification using Brownline’s GPS track can take place even within tight workspaces thanks to the compact and easy to handle surface equipment.

The longest bore punched out with 0.06 m (2.4 in) vertical deviation and 0.54 m (1.8 ft) horizontal deviation compared to the planned drill line. All crossings were completed with great efficiency and the client was very satisfied with the punch-outs.