Qin Hongwei, Dang Bo, Dang Ruirong, Liu Guoquan
Shaanxi Provincial Key Laboratory of Oil and Gas Well Measurement and Control Technology, Xi'an Shiyou University, Xi'an, 710065, Shaanxi, China.
China Petroleum Logging Limited Company, China.
Heliyon. 2024 May 29;10(11):e31835. doi: 10.1016/j.heliyon.2024.e31835. eCollection 2024 Jun 15.
During the measurement of multiphase flow in low yield oil wells, the liquid volume will vary with the operating characteristics of the pumping unit. Using the pulsating characteristics of the up and down strokes of a pumping unit, the flow rate is measured when there is a flow rate on the up stroke, and the water content is measured when the fluid is stationary on the down stroke. In this paper, the heat transfer method is used to measure the water content of the oil water mixture during the down stroke process. At this time, the water content can be expressed as the instantaneous water content of the oil well. Firstly, the feasibility of measuring water content using heat transfer method is demonstrated theoretically, and then the temperature change of the heating probe PT300 is simulated. Finally, the actual temperature of PT300 is measured experimentally. Comparing the experimental value with the simulation value, the calculated measurement error is within 1.27 %, which indicates that the heat transfer method is feasible for measuring water content. Using the same single sensor to measure oil water two-phase flow using the pulsation characteristics of the up and down strokes of a pumping unit is a major innovation in this paper. And lays a foundation for the detection of multiphase flow using heat transfer methods. The successful implementation of the text heat transfer method for measuring water content has broken the previous situation of multiple sensor detection, simplified the structure of multiphase flow instruments, and extended the life of the instrument.
在低产油井多相流测量过程中，液体体积会随抽油机的运行特性而变化。利用抽油机上下冲程的脉动特性，在上冲程有流量时测量流量，在下冲程流体静止时测量含水率。本文采用热传递法测量下冲程过程中油水混合物的含水率。此时，含水率可表示为油井的瞬时含水率。首先从理论上论证了采用热传递法测量含水率的可行性，然后对加热探头PT300的温度变化进行了模拟。最后对PT300的实际温度进行了实验测量。将实验值与模拟值进行比较，计算出的测量误差在1.27%以内，表明热传递法测量含水率是可行的。利用同一个单传感器，借助抽油机上下冲程的脉动特性来测量油水两相流，是本文的一大创新。并为利用热传递法检测多相流奠定了基础。文本热传递法测量含水率的成功实施，打破了以往多传感器检测的局面，简化了多相流仪器的结构，延长了仪器使用寿命。
