高压高产气井油管柱强度安全分析

随着越来越多的深层油气资源进行勘探开发，油气井管柱所处的工作环境也急剧恶化，尤其是高温、高压、高产井“三高”油气井。为研究高压高产气井油管柱强度安全，建立高压高产气井油管柱动力学模型，通过高压高产气井油管柱安全系数法和高压高产气井油管柱三轴应力法对高压高产气井油管柱强度进行校核，对高压高产气井油管柱基本应力和管柱尺寸对管柱应力的影响进行分析。结果表明：随着产量的增加，管柱的横向位移不断增大；在0～20 s内管柱(H300 m、H600 m,其中H为深度)的横向振动应力幅值比管柱(H1 660 m和H2 540 m)大，管柱横向应力振动幅值较大，随后振动应力趋于稳定；在0～10 s,管柱纵向应力振动幅值较大，且越靠近管柱下部管柱的纵向振动应力越大；管柱在井口位置处轴向力最大；大尺寸管柱有利于降低高速流体诱发管柱的振动问题。研究成果可为高压高产气井管柱设计提供理论指导。

Safety Analysis of String Strength in High Pressure and High Yield Gas Well

With more and more deep oil and gas resources, the working environment in which the oil and gas well pillar is placed sharply, especially the "three high" oil and gas wells, such as high temperature, high pressure, high-yet well. In order to study the strength safety of high-pressure high gas well oil pipe column, In this paper, a dynamic model of pipe string in high pressure and high productivity oil and gas Wells is established. The strength of the pipe string in high pressure and high productivity oil and gas Wells is checked by the safety factor method and the triaxial stress method of the pipe string in high pressure and high productivity oil and gas Wells. The influence of the basic stress and the size of the pipe string on the pipe string stress in high pressure and high productivity oil and gas Wells is analyzed.The results show that with the increase of production, the lateral displacement of the string increases continuously.The transverse vibration stress amplitude of the oil string (H300m, H600m) is larger than that of the oil string (H1660m and H2540m) within 0~ 20S, and the transverse stress vibration amplitude of the oil string is larger, and then the vibration stress tends to be stable.In the range of 0~10s, the amplitude of longitudinal stress vibration of the oil string is larger, and the closer to the lower part of the oil string, the greater the longitudinal stress vibration of the oil string.The axial force of the oil string is the largest at the wellhead position.The large size of the oil string is beneficial to reduce the vibration of the string induced by high-speed fluid.The research results can provide theoretical guidance for high-voltage high gas well pipe column design.