4.1.1. Drilling
For the drilling construction of wells, 30′′ (Well No. 4) and 22′′ (Well
No. 2) temporary casing up to 3m was installed. Soil sample for bore log
preparation was collected from each 3m interval, all drilling pipes were
measured, marked with red tape as an indication of soil sample
collection time. These wells cutting were started on December 07, 2019
and October 20, 2019, respectively. The used drills were 12”cutters and
drilling procedure was conducted by Kazal Enterprise. 35 KW generator
was used for power supply, 7.5 HP pump for circulating of water,
semi-mechanical rotary drilling machine with 10-ton lifting capacity and
2.5inch dia drilling pipes were used. The used drilling fluids were
local mud and bentonite. All collected soil samples were properly washed
and stored after marking the depth. The bore log format was observed by
AAN hydrogeologist and technical supervisor by checking of collecting
soil samples. For Well No. 2, 1st cutting reached 237.80m and found
continuous fine to medium sand layer from 189.02m - 237.80m whereas the
Well No. 4, 1st cutting reached 243.90m and found the continuous medium
to fine sand layer from 204.27m - 243.90m. The water-bearing zone
identification or simulation was developed by MATLAB (version 16) and it
is modified by Adobe Photoshop (version Ps 17).