CAJ | 학술논문

当前超深井钻柱安全性评价仍采用静力学方法，无法合理描述钻柱的动态安全性。通过建立超深井钻柱的动力学模型，并利用节点迭代方法和Newmark方法对其进行离散和求解，随后在分析钻柱动力学特性的基础上，利用动态应力求得钻柱的动态安全系数。通过不同钻压、转速条件下计算钻柱的动态安全系数，较好地确定了钻柱的合理工作参数范围。以塔标1井身结构三开井眼为例，得到了塔里木盆地超深井311.2 mm井眼所用钻柱的合理工作参数。
당전초심정찬주안전성평개잉채용정역학방법，무법합리묘술찬주적동태안전성。통과건립초심정찬주적동역학모형，병이용절점질대방법화Newmark방법대기진행리산화구해，수후재분석찬주동역학특성적기출상，이용동태응력구득찬주적동태안전계수。통과불동찬압、전속조건하계산찬주적동태안전계수，교호지학정료찬주적합리공작삼수범위。이탑표1정신결구삼개정안위례，득도료탑리목분지초심정311.2 mm정안소용찬주적합리공작삼수。
Static methods presently used for safety assessment of drill string in ultra-deep oil wells can not properly describe the dynamic safety of drill string.In this study,a dynamic model of drill string in ultra-deep oil wells is established and then discretized andsolved by using a combination of node iterative method and Newmark’s method.The dynamic safety coefficient of drill string is de-rived from the dynamic stress based on the analysis of dynamic characteristics of drill string.A rational range of drilling parametersof drill string is determined through the calculation of dynamic safety coefficient under different conditions regarding weight on bitand rotary speed.Further,the drilling parameters of drill string are optimized for 311.2mm diameter boreholes of ultra-deep wells inTarim Basin by taking an example of the third spud section of Tabiao-1 casing program.