用于油井相含率测量的光纤探针传感器研究

Study on Optical Fiber Probe Sensor for Oil Well Phase Holdup Measurement

摘要:

针对地面成熟三相流相含率测量传感器无法适应井下高温高压腐蚀的复杂环境,现有井下测量设备复杂,需要多种传感器和探头联合才能实现三相流相含率测量的问题,设计了一种光纤探针传感器。以蓝宝石作为光纤探针的前端敏感材料,利用气相和液相对光的折射率不同,通过检测探针反射光的光强来分辨光纤探针处于气相还是液相。通过检测经探针耦合进光纤的荧光光强分辨水相还是油相,从而实现单一探针传感器对油井内油相、水相、气相三相相含率的测量。

Abstract:

The mature three-phase flow phase holdup measurement sensor on the ground cannot adapt to the complex environment of high-temperature and high-pressure corrosion, and the existing downhole measuring equipment is complex. A fiber optic probe sensor was designed to solve the above problems. Sapphire was used as the front sensing material of the optical fiber probe. Due to the difference in refractive index of light between the gas phase and the liquid phase, the light intensity of the reflected light from the probe was detected to distinguish whether the optical fiber probe was in the gas phase or the liquid phase. By detecting the fluorescent light intensity coupled to the optical fiber through the optical fiber probe to distinguish the water phase or the oil phase, the measurement of the three-phase phase holdup of oil, water and gas in the oil well can be realized with a single probe sensor.