Drilling and Coring Techniques
Our main drilling technique is wire-line coring method which a core sample collected at the bottom of drill rod pipe is pulled up to the top of a hole by a wire. Because this technique has no need to recover all pipes whenever filling a core sampler up, it helps facilitate drilling in areas deeper than 100 meters. Therefore it is most suitable for slim core sampling boreholes under 15 centimeters in diameter at the length between 100 and 1,000 meters. Though a vertical or steep drilling angle hole is desirable for this technique, we have other techniques applying to a horizontal or gentle angle hole.
It is not easy to drill a deep borehole along the designed trace even if it is a vertical hole. We have skills to accurately complete the designed trace best suited for the purpose of the hole. Especially, we have achieved high accuracy monitoring boreholes within ±3 degrees requested for the installation of observation instruments at their bottom. Though horizontal and gentle angle hole traces are apt to end up lower than designed, we make angle corrections based on measure ments of the hole angle and direction in order to maintain accuracy.
Because it becomes more difficult to drill in deeper areas with the same size as shallower areas, a hole size reduction technique is applied for deeper areas using a large casing pipe for drilling with smaller size bits and rods. We propose the casing approach to size reduction techniques suitable for the purpose and specification of the borehole out of consideration for predicted subsurface conditions. Experienced drillers take effective countermeasures to bad conditions such as lost circulation mud water and stacking in drilling.
Drilling work
Drilled core sample
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Sumiko Resources Exploration & Development Co., Ltd
Sales Group of drilling devices
Address: 3-8-21. Toranomon, Minato-ku,
Tokyo, 105-0001, Japan
TEL：+81-3-5405-2173 /
FAX：+81-3-5405-2175