مهندس بترول - TOTCO RING A Totco ring is not really a sub, but it is included here for convenience. It is a small insert that is placed inside the drill string
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علي|ثقافة نفطية on Twitter: "TOTCO survey اداة قديمة وما زالت تستخدم للتعرف على زاوية ميلان الحفرة،فكرتها تحوي على إبره وتحتها ورقة تبين الزاوية ،يتم ضبط الجهاز على السطح (تحديد الوقت وعدد الوخزات)
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