地下储气井检测系统的研制

发布时间：2018-03-22 01:27

本文选题：储气井　切入点：微磁检测　出处：《南昌航空大学》2015年硕士论文　论文类型：学位论文

【摘要】：地下储气井在天然气加气站中发挥着重要作用,现已成为各个加气站首选的储气方式,其使用范围越来越广。由于地下储气井工作环境十分复杂,而且城市地下储气井周边人群众多,因此其带来的安全问题引起国家特别的重视。根据国家规定,在役地下储气井需要定期进行检测以便准确了解储气井在使用过程中出现的问题,及时进行处理以确保储气井安全的运行,避免出现重大安全事故。本文针对地下储气井存在的安全问题,研制基于微磁检测、涡流检测以及视频检测技术于一体的CNG地下储气井检测系统。根据储气井检测系统的整体性能要求,研究设计出地下储气井现场检测系统总体方案:该检测系统主要有井壁检测单元、井底检测单元以及视频检测单元构成。井壁检测单元主要基于微磁检测以及涡流检测技术,通过分析缺陷处的异常磁场信号,确定缺陷的性质以及大小;研究设计储气井井筒变形量计算软件算法,根据涡流传感器测量的距离值计算出井筒变形量;在检测过程中利用井下视频检测系统将井内实况传输到控制箱中直观显示。井底检测单元主要是利用微磁检测技术确定井底缺陷的大小以及性质,通过研究设计井底转动系统实现对储气井封头进行100%检测。该检测系统集成多种检测方法,并且在显示界面显示缺陷的二维彩图以及井筒变形截面图,为精确评估储气井使用状况提供依据。实验室内进行样管检测试验以及在四川加气站进行井下表明,该检测系统的缺陷检测技术能够检测深度为0.1mm,长度为2mm的裂纹以及面积为Φ5mm的腐蚀,井筒变形测量单元能够检测井筒内径0.1%的变化量,视频检测单元能够100%观察井筒内部状况并且该检测系统检测速度达到3m/min,能够适应Φ177.8mm以及Φ244.5mm等不同直径的储气井。该检测系统将为储气井的检测设计一种综合性多手段检测方法,为地下储气井的安全运行提供了有力的保障。
[Abstract]:The underground gas storage well plays an important role in the natural gas filling station and has become the preferred gas storage method for each gas filling station, and its application scope is more and more extensive. Because of the complex working environment of the underground gas storage well, Moreover, there are many people in the vicinity of the underground gas storage wells in cities, so the safety problems brought about by them have attracted special attention of the state. According to the state regulations, In service underground gas storage wells need to be tested regularly in order to accurately understand the problems in the use of gas storage wells and to handle them in time to ensure the safe operation of gas storage wells. In view of the safety problems in underground gas storage wells, a new method based on micromagnetic detection is developed. CNG underground gas storage well detection system, which integrates eddy current detection and video detection technology. According to the overall performance requirements of gas storage well detection system, The overall scheme of the field detection system for underground gas storage wells is designed. The detection system mainly consists of wellbore detection unit, bottom hole detection unit and video detection unit. The wellbore detection unit is mainly based on micro-magnetic detection and eddy current detection technology. By analyzing the abnormal magnetic field signal at the defect, the property and size of the defect are determined, and the calculation software algorithm of wellbore deformation is designed and calculated according to the distance measured by eddy current sensor. In the detection process, the downhole video detection system is used to transmit the in-well reality to the control box for visual display. The bottom hole detection unit mainly uses the micro-magnetic detection technology to determine the size and nature of the bottom hole defect. Through the research and design of bottom hole rotation system, 100% detection of gas storage head is realized. The system integrates many detection methods, and displays two-dimensional color drawings of defects and wellbore deformation sections at the display interface. To provide the basis for the accurate evaluation of the use of gas storage wells. The test of sample tubes in the laboratory and the downhole in Sichuan gas filling station show that, The defect detection technology of the system can detect cracks with depth of 0.1mm, length of 2mm and corrosion of 桅 5mm. The wellbore deformation measurement unit can detect the variation of wellbore diameter by 0.1%. The video detection unit can observe the inner condition of the wellbore 100% and the detection speed of the system reaches 3 m / min, which can adapt to the gas storage wells with different diameters, such as 桅 177.8mm and 桅 244.5mm. This detection system will design a comprehensive and multi-means detection method for the gas storage wells. It provides a strong guarantee for the safe operation of underground gas storage wells.
【学位授予单位】：南昌航空大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE822

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