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全苏钻井技术科研所研制出两种梯形丝扣连接的套管。 一种是OTTM1型套管。这种套管在轴向负荷作用下具有较高的强度,故可用在套管柱负荷最大的部位,即用在套管柱上部。它
All-Su drilling technology research institute has developed two kinds of trapezoidal thread connected casing. One is the OTTM1 bushing. This kind of bushing has higher strength under axial load, so it can be used in the place with the highest load of casing string, which is used in the upper part of casing string. it