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在满足井架使用要求的前提下 ,运用空间有限元计算方法 ,对传统的BJ2 - 18型试油井架进行优化设计。优化过程主要分两部分完成 :首先分析试油井架的受力状况 ,建立力学模型 ,并设定力学模型的边界条件 ;用有限元法进行强度和刚度计算 ,对井架进行尺寸优化和几何优化 ,按等强度原则确定井架优化后的各截面几何尺寸。优化后的SJY - 18型试油井架经过测试后完全达到设计要求 ,即强度与原井架相当 ,刚度及稳定性满足使用要求 ,经优化设计后的井架比原井架质量减轻 2 0 %。目前 ,该试油井架正在江苏油田推广使用。
On the premise of meeting the requirement of derrick, the traditional BJ2 - 18 type test derrick was optimized by using the method of space finite element calculation. The optimization process is mainly divided into two parts: First, the stress state of the test derrick is analyzed, the mechanical model is set up, the boundary conditions of the mechanical model are set, the strength and stiffness are calculated by the finite element method, the size optimization and geometry optimization of the derrick are carried out, According to the principle of equal strength to determine the geometry of the cross section of the derrick after optimization. Optimized SJY - 18 test derrick fully meets the design requirements after testing, that is, the strength is equal to the original derrick, and the rigidity and stability meet the requirements of use. The optimized derrick is 20% less than the original derrick. At present, the test derrick is being popularized and used in Jiangsu Oilfield.