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9 1/2 Inch Api 7-1 isanzwe igizwe na spiral blade stabilisateur, stabilisateur
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Umuyoboro wa 89mm wo gutobora amazi neza hamwe na API NIBA umugozi
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194mm 6m API ya dring cola coing na tubing drill collar yo gucukura neza
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Igiciro cyibicuruzwa byinshi byo kuroba Ibikoresho byose Ubunini Amavuta na gaze Amazi azacukura amakariso ya Tapi
