共查询到16条相似文献，搜索用时 171 毫秒
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油气井永久性光纤Bragg光栅传感监测系统的安装设计是现场应用的一个重要组成部分,也是工艺最复杂、成本最昂贵的一个环节.本文简要地回顾了油气井光纤Bragg光栅传感监测系统安装现状,根据国内常用射孔完井方式,设计了两种单井光纤Bragg光栅井下安装模型.论述了井下安装前准备工作和主要注意事项,讨论了存在问题,对油气井永久性光纤Bragg光栅传感监测技术及其安装技术的前景进行了展望. 相似文献
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为满足地震观测系统对实时性、高精度以及网络化的要求,提出了基于光纤Bragg光栅传感器和ARM的嵌入式系统设计方案,阐述了可调光纤F-P滤波器的工作机理和特点,并介绍了基于FBG传感器和ARM的地震观测系统的硬件结构和软件设计.采用三星公司的S3C2440对经过可调谐F-P腔解调后的波长信息进行采集,并对得到的数据进行处理.实验结果表明,该系统在处理精度和实时性方面都能达到要求,性价比高,有一定实用价值. 相似文献
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利用光纤光栅对温度和应力应变的敏感效应制成的传感器可以将温度、压力、应力、应变等物理量转换成光学量（波长）,由此所构成的测量系统具有极高的稳定性,不存在零点漂移,抗干扰能力强等一系列优点.不足的是光纤光栅传感器本身灵敏度不够高,在许多场合其测量分辨率不能满足要求,特别是作为地震前兆观测的主要测量手段——应力应变测量精度要求较高.本文提出一种技术思路,即通过增敏装置来提高系统测量分辨率,理论上可以将应力应变的测量分辨率提高到10-9至10-10量级,可以满足高精度应力应变测量的指标要求. 相似文献
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光纤光栅传感器(FBG)具有抗电磁干扰、结构简单、测量精度高、长期稳定性好,可以实现实时、在线监测等优点,在传感器领域中得到了广泛的应用。对自行开发的管式光纤光栅应变传感器进行了混凝土梁纯弯标定实验;利用光纤光栅传感器检测了混凝土结构内部的应变变化;应用该种传感器,对在白噪声、正弦波、随机波三种动力荷载作用下碾压仿真混凝土大坝坝段模型结构各个工况下的应变进行分析。结果表明:自行开发的管式光纤光栅传感器应变测量值与电阻应变片测量值符合很好;成功监测了碾压仿真混凝土大坝坝段模型在动荷载作用下的弹性应变和启裂应变,为大坝结构在地震作用下的健康状况分析提供可靠依据。 相似文献
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Yu-Li Wang Liang-Cheng Chang Fei Liu Yen-Te Ho Tzu Bin Wang Tian-Chyi Jim Yeh Jui-Pin Tsai 《Ground water》2022,60(4):518-529
Groundwater responses measured from multiple wells at different depths are essential for delineating the aquifer heterogeneity using hydraulic tomography (HT). In general, conducting HT requires many wells because traditional well monitoring is usually partially open at a specific depth interval or is fully penetrating. Accordingly, conducting an HT survey is typically costly and time-consuming. To tackle these issues, a new multi-level monitoring system (MLMS) for the HT survey was developed using the fiber Bragg grating (FBG) technique. This FBG MLMS could collect the depth-discrete groundwater observations from a fully penetrated 2-inch well. Three field campaigns were conducted to validate the capability of the FBG MLMS for HT surveys. The results show that the accuracy and stability of this MLMS are reliable and that FBG MLMS is beneficial for conducting an HT survey. Specifically, compared to the traditional monitoring well in an injection event, this FBG MLMS can concurrently cause an increase in the number of cross-hole tests several times and collect many more head observations than the standard methods, resulting in the observed flow fields efficiently reaching ergodic conditions and effectively improving the accuracy of the estimated hydraulic heterogeneity. Therefore, the FBG MLMS could be an alternative MLMS for efficiently and economically conducting an HT survey. 相似文献
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提出了直接找渍气的必要性和可能性,回顾了以往失误的原因,推荐了百灵软件,并期望各石油公司经理层能使用该软件,化较小的代价对地震资料进一步解释利用而提高钻井成功率,并最终降低油气成本。 相似文献
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Holdway DA 《Marine pollution bulletin》2002,44(3):185-203
A review of the acute and chronic effects of produced formation water (PFW), drilling fluids (muds) including oil-based cutting muds, water-based cutting muds, ester-based cutting muds and chemical additives, and crude oils associated with offshore oil and gas production was undertaken in relation to both temperate and tropical marine ecological processes. The main environmental effects are summarized, often in tabular form. Generally, the temporal and spatial scales of these studies, along with the large levels of inherent variation in natural environments, have precluded our ability to predict the potential long-term environmental impacts of the offshore oil and gas production industry. A series of critical questions regarding the environmental effects of the offshore oil and gas production industry that still remain unanswered are provided for future consideration. 相似文献
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A novel smart control system based on genetic algorithms (GAs) is proposed in this paper. The system is comprised of three parts: the fiber Bragg grating (FBG) sensor‐based sensing network for structural health monitoring, the GA‐based location optimizer for sensor arrangement, and the GA‐based controller for vibration mitigation under external excitation. To evaluate the performance of the proposed system, an eight‐story steel structure was designed specifically to represent a structure with large degrees of freedom. In total 16 FBG sensors were deployed on the structure to implement the concept of a reliable sensing network, and to allow the structure to be monitored precisely under any loading. The advantage of applying a large amount of information from the sensing system is proven theoretically by the GA‐based location optimizer. This result greatly supports the recent tendency of distributing sensors around the structure. Two intuitive GA‐based controllers are then proposed and demonstrated numerically. It is shown that the structure can be controlled more effectively by the proposed GA‐strain controller than by the GA‐acceleration controller, which represents the traditional control method. A shaking table test was carried out to examine the entire system. Experimental verification has demonstrated the feasibility of using this system in practice. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献