【摘要】 针对现有井控单级节流系统已不能满足塔里木油田高压高产气井勘探开发的要求,提出多级节流的方法。由于液动节流阀和液动平板阀数量的增加,多级节流压井控制过程更加复杂,目前用于控制单级节流压井的手动控制装置就不能适合于对多级节流的控制,需要研制一种新型的多级节流智能控制装置。它不仅能通过手动操作来实施多级节流控制,也可以联结工控计算机实现智能化程序操作控制和系统工况监测。阐述了一种实现多级节流的程序控制与手动控制结合的液压操作控制装置的结构原理、特点和试验结果。更多还原

【Abstract】 There are two approximately formulas on welding connection: one is the strength calculation of ring angle welding line in the action of bending moment;The other is the strength calculation of ring angle welding line in the action of torque.The derivation or the range of application of the approximately formulas in the all literatures was not given.The theory analysis on the approximately formulas,and the derivation in the paper made the range of application by accurately calculating and analyzing error of the approximately calculation was presented.更多还原