Бурение грунтовых зондов, установка энергетических колодцев

Pressure testing is routinely carried out after the casing is run and cemented. A pressure test of 60% of the burst rating of the weakest grade of casing in the string is often used (Rabia. 1987). During testing an additional tensile stress is exerted on the casing due to the internal pressure. The minimum tension safety factor should again be 1.8 for the top joint of each grade.

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