The success of the water well drilling operations increasingly led to clients asking Threeo International to provide additional services related to water wells eventually prompting management to diversify into a new division of the company dedicated to non-drilling services. Borehole Engineering Services division was established. This division of the Company has fully trained engineers dedicated to specialist testing, monitoring, surveying, borehole referbishment and remediation and decommissioning of boreholes. The division is also a distributor for borehole equipment and pump manufacturers.
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Case Study
Threeo’s International Company Limited advanced borehole maintenance technology completes Port Harcourt Refining Company Limited aquifer borehole refurbishment.
Solution
TICL carried out the following sequence of operations at the boreholes:
1. Removal and inspection of the permanent pumping equipment;
2 .Pre-clean downhole camera inspection;
3. Geophysical logging;
4. Borehole jetting with the Borestorer;
5. Backfilling (one borehole only)
6. Airlift pumping;
7. Borehole treatment with chlorine dioxide;
8. Airlift pumping;
9. Post-clean downhole camera inspection;
10. Cleaning, inspection and reinstallation of the permanent pumping equipment;
11. Clearance pumping.
The airlifted water was de-silted in a series of settlement tanks and any free chlorine was neutralized with sodium thiosulphate.
Results
The sequence of operations delivered outstanding results:
-Removal of large quantities of iron-oxide slime/encrustations on the casing and borehole wall;
No environmental impact on the nearby stream.
