A prototype of a fiber-optical downhole measurement system of pressure, temperature and flow
A prototype of a fiber-optical downhole measurement system of pressure, temperature and flow
复制标题
压力、温度和流量光纤井下测量系统原型
DOI：
10.1190/1.1845240
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
H. Niitsuma
中科院分区：
文献类型：
--
作者：
S. Takashima;H. Asanuma;H. Niitsuma
本文介绍了一种井下测量系统的原型，该系统采用光纤布拉格光栅（FBG）传感器，井下部分没有电路。这种设备可以将小型传感器部署在恶劣的井眼环境中。我们已经测试并演示了压力、温度和流体流速的测量。压力和温度测量使用双灵敏度光纤光栅系统进行区分。该系统在0.18 MParms和0.14 deg-Crms的预期范围内显示出线性响应。在流量测量方面，系统采用了互相关技术和卡门涡脱落频率技术。实验结果表明，该系统的线性响应速度可达1.00 m/s，最小检测速度为0.05 m/s。
Summary A prototype of a downhole measurement system is described in this paper that uses fiber Bragg grating (FBG) sensors without electrical circuits in the downhole part. Such a device could potentially allow small sensors to be deployed in harsh borehole environments. We have tested and demonstrated the measurements of pressure, temperature and fluid flow velocity. Pressure and temperature measurements are discriminated using a dualsensitivity FBG system. The system showed linear responses within an expected range and noise levels of 0.18 MParms and 0.14 deg-Crms. For the flow measurement, the system uses cross-correlation and Karman vortex shedding frequency techniques. It has been demonstrated from the laboratory tests that the system has a linear response up to 1.00 m/s and the minimum detectable velocity of 0.05 m/s.