Active‐distributed temperature sensing to continuously quantify vertical flow in boreholes

We show how a distributed borehole flowmeter can be created from armored Fiber Optic cables with the Active‐Distributed Temperature Sensing (A‐DTS) method. The principle is that in a flowing fluid, the difference in temperature between a heated and unheated cable is a function of the fluid velocity. We outline the physical basis of the methodology and report on the deployment of a prototype A‐DTS flowmeter in a fractured rock aquifer. With this design, an increase in flow velocity from 0.01 to 0.3 m s−1 elicited a 2.5°C cooling effect. It is envisaged that with further development this method will have applications where point measurements of borehole vertical flow do not fully capture combined spatiotemporal dynamics.

Raw project data is available by contacting [e-mail]

本研究所展示的是，如何利用具有主动分布式温度传感（A-DTS）功能的铠装光纤电缆构建分布式钻孔流量计。其原理在于，在流动的流体中，加热电缆与未加热电缆之间的温差是流体速度的函数。本文概述了该方法的物理基础，并报告了在裂隙岩石含水层中部署原型A-DTS流量计的情况。在此设计中，流量速度从0.01至0.3米每秒的增加，引发了2.5摄氏度的降温效应。展望未来，随着该方法的进一步发展，其在钻孔垂直流速的点测量无法充分捕捉时空动态组合的场景中将具有应用前景。

原始项目数据可通过联系[e-mail]获取。