一种设计玻璃钢混合杆柱抽油系统的新方法

A New Method of Design Fiberglass-Steel Mixed Sucker Rods Pumping System

玻璃钢抽油杆柱质量轻、弹性好,与一定比例的钢杆柱组合后能够实现超冲程。针对玻璃钢杆柱不能承受过大的轴向压力的特点,对杆柱系统失稳临界载荷进行分析,并在此基础之上提出以底部杆柱不受压失稳为目标的杆柱应力设计方法,给出了玻璃钢混合杆柱系统优化设计步骤。经对实际生产井进行设计,目前生产井运行良好,满足了预期要求。

Fiberglass sucker rods have the advantages of light,good elasticity and high tensile strength,the optimal designed of fiberglass-steel mixed sucker rods pumping can achieve plunger over travel and increase pump’s theoretic displacement.The desirable initial proportion of the mixed rods is provided in this paper,which can be use to save the computation time and improve the computational accuracy.By the fiberglass sucker rod can never work in the circumstance of a big compressive force,the paper also analysis the theories of destabilization of sucker rod.On the base of the analysis the stress constraints conditions of fiberglass-steel mixed rods pumping system,the paper invented a rod stress design method which its’ aim is to realize the rods at the bottom never subject to the failure pressure.The process of fiberglass-steel mixed sucker rods’ optimization design also be given in this article.Make use of the new methods to design a actual production wells,and now the wells operating normally.The results show that the advanced new methods can be use to design the fiberglass-steel sucker rods pumping system.