1. Quais tipos de hastes de perfuração são usadas na perfuração do núcleo?
ü Aluminium alloy drill rods
ü Seamless Steel drill rods
ü Wire-line drill rods (welded pipes)
2. Quais são os propósitos dos tubos de revestimento?
ü To penetrate and stabilize the overburden
üTo stabilize non-stable formations with a tendency to cave in
3. Por que você deve sempre usar chaves de aperto total ao trabalhar, por exemplo, com tubos internos e caixas do elevador central?
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. Que tipos de ferramentas de pesca devem estar sempre disponíveis no local de perfuração?
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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