基于多评判指标优选的石油井架安全评估

发布时间：2018-09-03 14:13

【摘要】：石油井架是整个石油钻机系统的关键承载设备,主要承受起下钻、下套管及其它作业产生的载荷,其工作安全性至关重要。本文介绍了石油井架安全评估的两种主要方法——可靠度和强度、稳定性方法,提出了石油井架随机可靠度、稳定性评价指标,举例分别应用随机可靠度、稳定性评价指标对某型号井架进行安全性评定。研究了石油井架损伤缺陷的等效处理方法;分析了各评价指标对石油井架损伤及载荷敏感性,并应用模糊积分综合评价法对石油井架安全评价指标进行优选。最后,对含有损伤缺陷的JJ220/42-K型实验室模型井架进行基于多指标优选的石油井架安全评估,综合分析确定了其安全承载力。考虑了井架载荷、材料属性及结构几何尺寸等因素随机作用,提出了以随机可靠度为评价指标的石油井架安全评估方法,建立石油井架模型,编制了井架命令流分析文件,分析了某型号石油井架的随机可靠度和安全性。介绍了石油井架强度,立柱稳定性、整体稳定性评价方法,引入井架立柱稳定性、整体稳定性评价指标,计算了井架立柱稳定性、整体稳定性指标数值,给出了基于强度、稳定性的石油井架安全评估的基本过程,对某型号石油井架进行了稳定性评价。分析了石油井架常见的损伤缺陷——腐蚀和初弯曲,推导了井架杆件等效截面积随腐蚀深度变化的函数关系;根据现场石油井架初弯曲变形特征,将其简化为正弦波形弯曲,得到了不同变形的转换系数。研究了石油井架随机可靠度指标、立柱稳定性指标和整体稳定性指标随井架载荷、腐蚀、初弯曲变化的敏感程度,采用模糊积分综合评价法,建立了石油井架安全评价指标优选模型。举例对含损伤的JJ220/42-K型实验室模型井架进行安全性评价。分析井架损伤特征,优选评价指标,通过计算指标数值,评定了井架安全性,并得到了井架在此条件下的安全承载力。
[Abstract]:The oil Derrick is the key loading equipment of the whole oil drilling rig system, which mainly bears the load of the drilling, casing and other operations. The safety of the Derrick is very important. In this paper, two main methods of oil Derrick safety evaluation are introduced, such as reliability, strength and stability. The random reliability and stability evaluation index of petroleum Derrick are presented. The stability evaluation index is used to evaluate the safety of a certain type of Derrick. The equivalent treatment method of oil Derrick damage defect is studied, the sensitivity of each evaluation index to oil Derrick damage and load is analyzed, and the fuzzy integral comprehensive evaluation method is applied to select the oil Derrick safety evaluation index. Finally, the safety evaluation of JJ220/42-K laboratory model Derrick based on multi-index selection is carried out, and its safety bearing capacity is determined by comprehensive analysis. Considering the random action of Derrick load, material properties and structure geometry, a method for evaluating the safety of oil Derrick is presented, which takes random reliability as the evaluation index. The oil Derrick model is established, and the analysis file of Derrick command flow is compiled. The random reliability and safety of a certain oil Derrick are analyzed. This paper introduces the evaluation method of oil Derrick strength, column stability and overall stability, introduces the Derrick column stability and overall stability evaluation index, calculates the Derrick column stability and overall stability index, and gives the strength based on the strength. The stability evaluation of a certain type of oil Derrick is carried out in the basic process of safety evaluation of a stable oil Derrick. The common damage defects of oil Derrick, corrosion and initial bending, are analyzed, the functional relation of equivalent cross-sectional area of Derrick member with corrosion depth is deduced, and it is simplified as sinusoidal bending according to the characteristics of initial bending deformation of oil Derrick in situ. The conversion coefficients of different deformation are obtained. The sensitivity of oil Derrick random reliability index, column stability index and overall stability index with the change of Derrick load, corrosion and initial bending is studied. The fuzzy integral comprehensive evaluation method is used. The optimal selection model of oil Derrick safety evaluation index is established. An example is given to evaluate the safety of JJ220/42-K laboratory model Derrick with damage. The damage characteristics of Derrick are analyzed and the optimum evaluation index is selected. The safety of Derrick is evaluated by calculating the index value and the safety bearing capacity of Derrick under this condition is obtained.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE923

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