恒温差热式流量计影响因素模拟与试验研究 |
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引用本文: | 张夷非,魏勇,余厚全,陈强,刘国权,张学. 恒温差热式流量计影响因素模拟与试验研究[J]. 石油钻探技术, 2021, 49(2): 121-126. DOI: 10.11911/syztjs.2021023 |
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作者姓名: | 张夷非 魏勇 余厚全 陈强 刘国权 张学 |
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作者单位: | 1.长江大学电子信息学院,湖北荆州 434023 |
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基金项目: | 国家科技重大专项“多维高精度成像测井系列”(编号:2017ZX05019001)资助 |
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摘 要: | 针对恒温差热式流量计在井下测量小流量流体时误差较大的问题,进行了温度、压力的影响研究.根据流量计加热器电功率与被测流体流量的关系,分析了温度对液态水物性参数的影响,通过数值模拟研究了不同温度下水流量与流量计换热功率的变化曲线.在此基础上,搭建了可调节水温和流体流量的试验平台,在定压(常压)条件下,通过试验分析了25~4...
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关 键 词: | 恒温差热式流量计 流量测量 温度 压力 数值模拟 实验室试验 |
收稿时间: | 2020-11-02 |
Simulation and Experimental Studies on the Influencing Factors of a Thermal Flowmeter with Constant Temperature Difference |
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Affiliation: | 1.Electronics & Information School, Yangtze University, Jingzhou, Hubei, 434023, China2.China Petroleum Logging Co. Ltd., Xi’an, Shaanxi, 710077, China |
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Abstract: | Due to the fact that the thermal flowmeter with constant temperature difference brings large errors when measuring downhole flow in low flow-rate, the influence of temperature and pressure was studied. According to the relationship between the electric power of the flowmeter heater and the measured flow rate, the influence of temperature on the physical parameters of liquid water was analyzed, and the change curve of the heat transfer power of the flowmeter and flow rate at different temperatures was simulated numerically. An experimental platform with adjustable water temperature and flow rate was built on that basis, and the relationship between the power of the flowmeter and flow rate at 25–40 °C under constant pressure was thereby analyzed, revealing that power of the flowmeter heater increases monotonically with temperature. In terms of theoretical analysis, a 500 m increase in the well depth leads to an error of 2.2 m3/d when the flowmeter is in the depth from 0 to 2 000 m; while the error is 0.6 m3/d when it is in the depth from 2 000 to 4 000 m. The results showed that output power of the thermal flowmeter with constant temperature difference will increase with the increase of well depth (wellbore temperature, pressure change), resulting in measurement errors, which provides a theoretical basis for the correction and effective application of the flowmeter measurement results. |
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