Mechanical analysis of tubing string in well testing operation
Mechanical analysis of tubing string in well testing operation
复制标题
DOI：
10.1016/j.petrol.2012.04.019
复制
发表时间：
2012-07
影响因子：
--
通讯作者：
Zifeng Li
中科院分区：
文献类型：
--
作者：
Zifeng Li
地层测试是油气田勘探开发的重要环节。在试井作业中，在多种载荷的作用下，油管可能会不断屈服、断裂和弯曲，造成严重的经济损失。根据地层测试作业流程，考虑井眼轨迹、测试管柱组成、井眼流体性质、内外压力、测试管柱与井壁摩擦系数、地温梯度、油管温度、测试阀类型、封隔器类型、封隔器活塞效应、油管螺旋屈曲效应等因素，建立了整个测试作业中测试管柱力学分析的数学模型。用微分法求解了这些数学模型，得到了张力、扭矩、应力、安全系数、稳定性和伸长率等参数。利用Visual Basic 2008开发了试井作业中管柱力学分析软件。该软件已在中国石油化工集团公司西北油田分公司多口井中应用，对测试管柱组合进行了验证和优化。提供了一个现场应用程序。讨论了最小安全系数与断管柱的关系。
Formation testing is an important procedure in oil–gas field exploration and development. Tubing string may yield, break and buckle perpetually under actions of manifold loads in well testing operation, resulting in severe economic loss. Based upon operation procedures of formation testing, by taking into account well trajectory, component of testing string, borehole fluid property, internal and external pressure, friction factor between testing string and well wall, geothermal gradient, tubing temperature, test valve types, packer types, piston effect of packer, helical buckling effect of tubing, etc., mathematical models for mechanical analysis of testing string in whole testing operation have been established. These mathematical models have been solved with differential methods, obtaining parameters such as tension force, torque, stress, safety factor, stability and elongation. A software of mechanical analysis of tubing string in well testing operation is developed using Visual Basic 2008. This software has been applied to many wells to verify and optimize testing string combination in Northwest Oilfield Branch of China Petroleum and Chemical Corporation. A field application is provided. A discussion of relationship between the minimum safety factor and string break is made.