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目前,石油套管联接的螺纹牙形有园扣、梯形扣和奥米加扣等几种扣型。固井工程中,最常用的套臂螺纹为园扣。关于园扣螺纹的尺寸参数,国产套管及接箍规范(YB690—70)、API套臂规范以及苏制套管规范均作了规定。规范中,除规定了螺纹每时长的扣数外,尚有长扣与短扣之分。各种尺寸的套管,螺纹(长扣和短扣)的有效总扣数在18—35扣之间。
At present, there are several types of buckles, such as buckles, trapezoidal buckles and omega buckles, connected by the oil casing. Cementing projects, the most commonly used thread for the sleeve button buckle. On the size parameters of the park button thread, the domestic casing and coupling specifications (YB690-70), API sleeve arm norms and casing regulations are made. Specification, in addition to the provisions of the thread per length of the buckle, there are long buckle and short buckle points. Various sizes of casing, thread (long buckle and short buckle) the effective total deduction in 18-35 buckle.