1. در حفاری هسته از کدام نوع میله های مته استفاده می شود؟
ü Aluminium alloy drill rods
ü Seamless Steel drill rods
ü Wire-line drill rods (welded pipes)
2. اهداف لوله های پوششی چیست؟
ü To penetrate and stabilize the overburden
üTo stabilize non-stable formations with a tendency to cave in
3. چرا باید همیشه هنگام کار با لوله های داخلی و کیس های بالابر اصلی همیشه از آچارهای دسته کامل استفاده کنید؟
ü It is important to use the right type of rod wrench. So called universal rod tongs should be avoided especially when it comes to breaking or tightening the thread of an inner tube or any other thin walled piping. Universal tongs can easily destroy thin walled piping. For these pipes only so called full grip wrenches should be used.
4. کدام نوع ابزار ماهیگیری باید همیشه در سایت مته موجود باشد؟
ü No matter how careful the driller and the helper are, sooner or later they will
ü accidently drop a tool down the drill hole. Drill pipes can also break in the hole.
ü These items must be removed before the drilling can continue. Normally, according to the hole size of the projects, we should prepare 1 or 2 sets of NWL(NQ), HWL(HQ), PWL(PQ) sizes of rod recovery rod at the site.
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