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Thermal Measurement Techniques in Analytical Microfluidic Devices
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Research on water content measurement method based on heat transfer method.

Hongwei Qin1, Bo Dang1, Ruirong Dang1

  • 1Shaanxi Provincial Key Laboratory of Oil and Gas Well Measurement and Control Technology, Xi'an Shiyou University, Xi'an, 710065, Shaanxi, China.

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|July 1, 2024
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Summary

This study introduces a novel heat transfer method to measure water content in oil-water mixtures during oil well pumping. This innovation simplifies multiphase flow instruments and improves measurement accuracy.

Keywords:
Heat transfer methodPlatinum resistanceSpecific heat capacityThermal conductivityWater content

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Area of Science:

  • Petroleum Engineering
  • Fluid Dynamics
  • Sensor Technology

Background:

  • Measuring multiphase flow in low yield oil wells is challenging due to varying liquid volumes.
  • Traditional methods often require multiple sensors, complicating instrument design and maintenance.
  • Pulsating characteristics of pumping units offer a unique opportunity for flow rate and water content measurement.

Purpose of the Study:

  • To develop and validate a heat transfer method for measuring water content in oil-water mixtures.
  • To utilize the downstroke phase of a pumping unit for stationary fluid analysis.
  • To simplify multiphase flow instrumentation by employing a single sensor.

Main Methods:

  • Theoretical feasibility demonstration of the heat transfer method for water content measurement.
  • Simulation of temperature changes in a heating probe (PT300) during the downstroke.
  • Experimental measurement of the actual temperature of the PT300 probe.

Main Results:

  • The heat transfer method was theoretically validated for measuring water content.
  • Experimental results showed a measurement error within 1.27% when compared to simulations.
  • The study successfully demonstrated the use of a single sensor for measuring oil-water two-phase flow.

Conclusions:

  • The heat transfer method is a feasible and accurate technique for measuring water content in oil wells.
  • This approach simplifies multiphase flow instrument structure and extends instrument lifespan.
  • The findings lay the groundwork for future multiphase flow detection using heat transfer principles.