GBOGBO awọn tubes drills DTH jẹ welded edekoyede, ati nigbagbogbo awọn okun jẹ awọn asopọ API boṣewa, bii 2 3/8 ″ API REG thread, 3 1/2 ″ API REG thread or API IF thread, bbl Ni ibamu si ibeere awọn alabara, lati 1000mm si 5000mm ipari ti awọn tubes, OD a le pese 50mm, 60mm, 76mm, 89mm, 102mm

Awọn iyẹ awọn ọja:

1: Nitriding lori o tẹle okun ti isẹpo ọpá lati mu líle ti o tẹle ara dada ati mu awọn yiya resistance ti o tẹle.
2: Lilo R780 bi awọn ohun elo ti opa ara lati mu awọn yiya resistance ati awọn agbara, 42 Cr Mo ohun elo fun o tẹle asopọ.
3: Gba itọju ibinu lati dinku iwuwo ọpá lakoko ti o tọju agbara ti awọn welds (sisanra tidth pipejẹ 6.5mm nigba ti agbegbe welds jẹ 8.5mm).