用9-5/8”(244mm)的套管皮碗试压器,封5”(127mm)钻杆,对防喷器组试压至70MPa。皮碗试压器承压面积是42.4”2(274cm2)。试压时所用钻杆的最小钢级是多少?(不考虑安全系数和应力影响)()
A. E-75优质钻杆,抗拉强度=141,000kg(311,200lbs)
B. 任何一种钻杆均可.
C. S—135优质钻杆,抗拉强度=254,000kg(560,100lbs)
D. G—105优质钻杆,抗拉强度=198,000kg(436,150lbs)
E. X—95优质钻杆,抗拉强度=179,000kg(394,200lbs).