摘要
随着能源需求的攀升和常规油气资源的衰竭,非常规能源的开发需求引导我国油气钻井正向深层/超深层进军。钻井面临更为复杂的地质工程条件,使得钻柱在工作过程面临更为严峻的考验。针对钻柱的关键薄弱点,即以钻柱变径接头螺纹为研究对象,建立了三维有限元计算模型,分析了不同载荷工况下的接头螺纹受力变形规律。结果发现:最大等效应力与扭矩载荷存在非线性的指数曲线关系;最大等效应力与压力载荷呈线性关系;定扭矩变拉力或者定扭矩-变压力复合载荷下,最大等效应力与拉力或者压力载荷成非线性2次多项式关系;定拉力-变扭矩复合载荷下,最大等效应力与扭矩载荷成非线性2次多项式关系。
With the increase of energy demand and the depletion of conventional oil and gas resources,the development demand of unconventional energy leads oil and gas drilling in China to deep/ultra deep formations.Drilling engineering faces more complex geological engineering conditions,which makes the drill string suffering more severe tests in the working process.In this paper,a three-dimensional finite element model was established based on the thread of the drill string reducing joint,and the law of stress changes under different load conditions was analyzed.The study found that there was a nonlinear exponential curve relationship between the maximum equivalent stress and the torque load;the maximum equivalent stress had a linear relationship with the pressure load;under a constant torque-variable tension or constant torque-variable pressure compound load,the maximum equivalent stress and the pressure load had a nonlinear second-order polynomial relationship;under the constant tension-variable torque compound load,the maximum equivalent stress and the torque load had a nonlinear second-order polynomial relationship.
作者
白劲松
李士斌
刘照义
BAI Jin-song;LI Shi-bin;LIU Zhao-yi(Northeast Petroleum University,Daqing Heilongjiang 163318,China)
出处
《当代化工》
CAS
2022年第2期462-465,共4页
Contemporary Chemical Industry
基金
国家自然科学基金(No.51874098)。
关键词
复杂钻井
变径接头
有限元分析
复合载荷
应力变化规律
Complex drilling
Variable diameter joint
Finite element analysis
Compound load
Stress change law
