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Deep Well Repair in Peru
Deep Well Repair in Peru
Deep Well Repair in Peru
Deep Well Repair in Peru
Deep Well Repair in Peru
Deep Well Repair in Peru
08-09-2014

INTRODUCTION

The Yanacocha Gold Mine, the world’s largest open pit mine, is located at 4,700 meters altitude in the Andes mountains in northern Peru.

Deep wells had been drilled from high levels to the aquifer below to supply water to the mines. This entailed transporting heavy drilling equipment and casing tubes to otherwise inaccessible mountaintops where the mine plant and shaft entrances are located.

As the well casings deteriorated, owners had the choice either to drill new wells, or repair the old ones.

The Link-Pipe repair method was chosen as the lowest cost alternative.

PROJECT 

Carbon steel well casings eventually corrode due to stray currents emitted from pumps. Inflowing water brings in gravel and clay. This eventually damages the pumps and clogs supply.

Owners had decided to look for new technology to repair the well casing. Geotec Boyles Bros.S.A,-Chile, the chosen contractor, approached Link-Pipe.

Link-Pipe was chosen because the products light materials could be transported to the repair site by a small pickup truck.

Link-Pipe had not been involved in well-casing problems before. One of the stainless steel series of sleeves was chosen, but it needed modification.

Modification was carried out by Link-Pipe R&D staff. Before shipping, a shaft model was built. Then the sleeves were installed to test for proper fit. The test proved a good fit and the sleeves were shipped to the mine.

Link-Pipe sent a technical sales representative to Peru to train and supervise the installation. In this particular case two Link-Pipe Sleeves were to be installed. The first one was 320 meters deep and the second one at 280meters deep. The installation of the sleeves is done remotely, using a CCTV Camera. The first Link-Pipe Sleeve was installed at the exact location and covered the damaged well casing area. Then the CCTV Camera broke. Since time was of the essence, with Thunderstorms fast approaching, the Link-Pipe technical representative decided to improvise and install the second Sleeve without using the CCTV Camera.

The second Sleeve had to be installed exactly at the 280 meter mark. This procedure entailed putting a marker on the cable at the 280 meter mark from the center of the Link-Pipe Sleeve. Next, the Sleeve was lowered and installed. The inspection was done the next day with a CCTV Camera and it showed that the Sleeve was successfully installed over the damaged area in the well casing.

CONCLUSION:

This retrofit project assured that the Link-Pipe Engineering design team was capable of designing such a new technique and product suitable to repair very deep water wells.

This also demonstrates that the Link-Pipe technology is such that the installation crew, having previous construction experience, can easily be trained (About 2 hrs.) to carry out the installation of the Link-Pipe Sleeves.