差动式光纤布拉格光栅渗压传感器的研究

为了对土壤中渗透水压力进行精确测量,根据波纹管的压力传感特性,以及等强度悬臂梁与光纤Bragg光栅的应变传感特性,设计了一种差动式光纤布拉格光栅(FBG)渗压传感器。传感器通过土壤渗透水压力推动波纹管轴向应变转化成等强度悬臂梁挠度变化,进而转化成FBG轴向应变。通过测量FBG中心波长的变化获得压力值,利用差动式结构降低了环境温度变化带来的影响。在常温条件下进行标定试验,得出升压过程中传感器的渗压灵敏度约为11.96 pm/k Pa,线性度为1.3%,重复性为2.9%;降压过程中传感器的渗压灵敏度约为10.56 pm/k Pa,线性度为4.6%,重复性为1.9%;环境温度变化对测量结果影响小于1%。试验结果表明,该光纤光栅渗压传感器能够对小量程范围内的渗压进行准确测量,同时可以通过改变波纹管及等强度梁参数将其推广到大量程的测量。

低功耗无线振弦式测量模块的研制与应用

振弦式传感器及测量模块广泛应用于水电工程、岩土工程等工程的安全自动监测系统中,本文针对振弦式测量模块的电源功耗、通信组网方式、激振及测量等方面进行了研究,设计出一种基于Zig Bee无线通信技术的低功耗、高精度、多通道的振弦式测量模块,并在甘肃刘家峡水电站成功构建了基于该模块的无线渗压测量系统,目前成功运行近两年,取得了良好的应用效果。

Application of wireline formation tester in Tarim Oilfield

The application of wireline formation tester(WFT)gradually extends in oil-field with the constant improvement of instrument functions.Applications of WFT in oil and gas exploration in Tarim Oilfield,such as formation pressure measurement,are described,and testing efficiency between drill stem testing(DST)and WFT are compared,especially comprised of PVT sampling,hydrocarbon composition estimation,fluid characterization analysis and formation permeability analysis.The test results between WFT and traditional DST show that their functions can be complementary.The influence factors of WFT and the suitable applying conditions for WFT and DST are also discussed.