油气藏型储气库深斜井注采管柱振动失效分析

doi:10.11885/j.issn.1674-5086.2026.03.12.03

摘要/Abstract

摘要： 针对油气藏型储气库深斜井注采管柱在交变温压载荷与大排量注采工况下易发生振动失稳、强度失效的问题，以冀东N储气库深斜井为研究对象，建立流固耦合有限元模型，分析管柱振动响应规律及注采气量、井深及管柱外径等对受力与变形的影响，明确振动失效敏感因素并提出安全控制策略。结果表明，注采管柱振动分为0~6 s非稳态波动与7~15 s稳态振荡两个阶段，开井初期水锤效应导致应力骤升，最大Mises应力达886.45 MPa，存在屈曲失效风险；井口应力幅值最大，井中部横向振动最显著，且横向振动远强于纵向振动；注气量增加显著提升管柱应力水平，外径101.60 mm管柱在注气量83×10⁴ m³/d时，振动初期应力超过屈服强度；增大管柱外径会提高初期应力波动幅度，但可抑制横向振动增幅。基于“注气量管径”耦合关系，提出优化注采气量、重点监测注气初期应力突变与井中振动幅值的安全控制策略，研究结果可为储气库深斜井注采管柱安全运行提供技术支撑。

关键词: 储气库, 注采管柱, 管柱振动, 管柱失效, 安全控制

Abstract: Aiming at the problems of vibration instability and strength failure easily occurring in the injection-production string of deep directional wells in hydrocarbon reservoir gas storage under alternating temperature-pressure loads and high-rate injection-production conditions, this paper takes the deep directional wells in Jidong N Gas Storage as the research object, establishes a fluid-structure coupling finite element model, analyzes the vibration response law of the string and the influences of gas injection rate, well depth and string outer diameter on its stress and deformation, identifies the sensitive factors of vibration failure and puts forward safety control strategies. The results show that the vibration of the injection-production string is divided into two stages: unsteady fluctuation (0~6 s) and steady oscillation (7~15 s). The water hammer effect at the initial stage of well opening leads to a sharp rise in stress, with the maximum Mises stress reaching 886.45 MPa, posing a risk of buckling failure. The stress amplitude at the wellhead is the largest, the transverse vibration in the middle of the well is the most significant, and the transverse vibration is much stronger than the longitudinal vibration. The increase of gas injection rate significantly raises the stress level of the string. For the string with an outer diameter of 101.6 mm, the stress exceeds the yield strength at the initial stage of vibration when the gas injection rate reaches 83×10⁴ m³/d. Increasing the outer diameter of the string will raise the initial stress fluctuation amplitude, but can inhibit the increase of transverse vibration. Based on the coupling relationship between “gas injection rate and pipe diameter”, a safety control strategy is proposed to optimize the injection-production gas rate and focus on monitoring the stress mutation at the initial stage of gas injection and the vibration amplitude in the middle of the well. The research results can provide technical support for the safe operation of injection-production strings in deep directional wells of gas storage.

Key words: underground gas storage, injection-production string, string vibration, tubing string failure, safety control

中图分类号:

TE93

王芳, 王金忠, 许晶晶, 张锋刚, 马艳. 油气藏型储气库深斜井注采管柱振动失效分析[J]. 西南石油大学学报(自然科学版), 2026, 48(4): 168-180.

WANG Fang, WANG Jinzhong, XU Jingjing, ZHANG Fenggang, MA Yan. Vibration Failure Analysis for Injection-production Strings in Deep Directional Gas Storage Wells[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2026, 48(4): 168-180.

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