The pilot guide (11) has a drill diameter (b1), whereas the step (124) leads into an enlarged drill diameter (b2).
The step guide (21) of the first step drill (2) has a drill diameter (b2') that corresponds to the drill diameter (b2).
The diameter of the neck section (6) is less than the drill diameter (2), and the length (12) of the neck section (6) is not less than 10 times the drill diameter (2).
The drill diameter (b3) at the drill neck (22) of the first step drill (2) corresponds to the drill diameter at the step guide (21) of the second step drill (2).
The small-diameter drill (1) has a drill diameter (2) of not more than 1 mm and has, at its drill section (5), cutting edges (3) and grooves (4).
The drill is made of a non-solid drill bit with a diameter of 90-120 mm.
The present invention is a system and method for measuring borehole conditions, in particular for verification of a final diameter of a borehole.
The length (11) of the grooves (4) is not less than 5 times but not more than 10 times the drill diameter (2).
The diameter of the lower tubular bore (34) is preferably about 1.3 times the diameter of the upper tubular bore (24).
The second passage borehole (6) has a diameter which is different from the diameter of the third passage borehole (5).
The pilot guide (11) has a drill diameter (b1), whereas the step (124) leads into an enlarged drill diameter (b2).
The step guide (21) of the first step drill (2) has a drill diameter (b2') that corresponds to the drill diameter (b2).
The diameter of the neck section (6) is less than the drill diameter (2), and the length (12) of the neck section (6) is not less than 10 times the drill diameter (2).
The drill diameter (b3) at the drill neck (22) of the first step drill (2) corresponds to the drill diameter at the step guide (21) of the second step drill (2).
An 'extremly small diameter' borehole is defined as a borehole which has a diameter that is always less than the diameter of any production tubing which would normally be inserted into the borehole.
Requêtes fréquentes français :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
Requêtes fréquentes anglais :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
Traduction Translation Traducción Übersetzung Tradução Traduzione Traducere Vertaling Tłumaczenie Mετάφραση Oversættelse Översättning Käännös Aistriúchán Traduzzjoni Prevajanje Vertimas Tõlge Preklad Fordítás Tulkojumi Превод Překlad Prijevod 翻訳 번역 翻译 Перевод