Drilling Bits Explained A dillblit is what actually cuts into the rock when drilling an oil or gas well. Located at the tip of the drillstring, below the dritf collar and the drill pipe, the drill bit is a rotating apparatus that usually consists of two or three cones made up of the hardest of materials and sharp teeth that cut into the rock and sediment below. شرح رؤوس الحفر رأس الحفر هو ما يقطع الصخور عند حفر بئر نفط أو غاز. يقع رأس الحفر عند طرف سلسلة الحفر، أسفل طوق الحفر وأنبوب الحفر، وهو ج
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