Falcon F5 River Crossing

Ganggu No-Dig Engineering company of Tianshui, Gansu Province, an underdeveloped province in the western region of China was subcontracted to drill a river-crossing bore of a maximum depth of 28m and install 457mm steel gas pipe of 740m in length.

Both the depth and distance is a challenge for the job, DCI Field Service personnel presented them with the Falcon F5. The strong capability of Falcon technology and its Datalog feature confirmed the contractor’s need to purchase a Falcon F5 for this job. As the only no-dig contractor in the region of Tianshui County, Gangu No-Dig Engineering company, under DCI’s guidance, fully utilized data-logging and LWD features.

In Gansu Province, the HDD market is still small but the region belongs to China government’s “one-belt-one-road” investment initiatives (so called re-start of the old silk road). The challenges of the job were the stability of R/P data at the depth of 28m and how to locate above a river.

After conducting a frequency optimization to determine the best operating frequencies, Band 38 was selected for their 19” transmitter. The following above ground range test showed that the R/P data could reach 38m.

Stable signals made locating and drilling easy except for part of the river crossing. It was hard to find the consistent locate lines for data logging while sitting in a boat starting.

Intermittent readings were available with the use of Max Mode. The bore was successfully completed in 16 hours. The contractor knew that a magnetic guidance system is usually required for such a deep bore, especially crossing water. They were very satisfied with the performance of Falcon F5 and the success of the pilot bore.

*The above chart provides the as-built of the bore and the annular drilling fluid pressure measured during the pilot bore.

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