Бурение грунтовых зондов, установка энергетических колодцев

Critical collapse resistance of casing is calculated in accordance with the API equations given in the API Bui. 5C3 (1989). The equations are those adopted at the 1968 Standardization Conference and reported in Circular PS-1360 dated September 1968. For standard casings, the collapse values can be taken from

the appropriate tables of API Bui. 5C2 (1987). In a 1977 report, Olinedinst proposed new collapse formulas, which provide better agreement with the test results obtained by Krug (1982). In this section, limitations and scope of API collapse formulas and the formulas developed by other investigators are reviewed.

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