油井多相流动电磁全息方法研究

Study of electromagnetic holographic methods for multiphase flow in oil wells

鉴于油井生产过程中流体分布的复杂性和流动变化的随机性,正在兴起的多相流动测量与成像研究遇到严重挑战,尤其是敏感场构建、多模信息融合和流动图像重建等关键技术亟待突破。电磁全患方法旨在根据探测物理场特性,基于成像测量理论,研究建立全新的双模敏感场,对传感器采集信号的实部和虚部信息进行融合,探索高效适用的全息成像方法,并通过模拟流动测量实验检验全息成像可行性和精确度。研究表明,全息测量数据特征区别明显,能够充分突出各相流体导电特性与介电特性的差异;全息测量敏感场相比原有敏感场更加适用于油井多相流动电磁全息方法;基于双模融合的全息成像方法有益于提高全息成像精度。流动模拟测量检验结果表明,油井多相流动电磁全息方法是可行的,具有良好的应用前景。

In view of the complexity of fluid distribution and the randomness of flow changes in the production process of oil wells,flow imaging measurement encounters serious challenges.In particular,key technologies such as the establishment of sensitivity fields,the fusion of multi-mode data,and flow image reconstruction are all in need of breakthroughs.In this paper,according to the characteristics of the physical detection field,based on the theory of imaging measurement,we focus on the research into a new dual-mode sensitivity field,the fusion of real and imaginary parts of the measurement data from the array sensor and the holographic tomography method with high efficiency and feasibility.Further,we investigate the feasibility and accuracy of holographic tomography through simulated flow measurement experiments.The research results in this paper show that holographic measurement data vary significantly,which highlights the differences in the conductivity and permittivity properties of various phases of fluid.The holographic measurement sensitivity field is more suitable for electromagnetic holographic measurement of multiphase flow in oil wells than previous sensitivity fields and the dual-mode fusion-based holographic tomography method is useful for improving the accuracy of holographic tomography.By carrying out a series of specific procedures in simulated flow measurement experiments,we can finally obtain the typical flow patterns of clearer gas-water interfaces and calculates flow parameter of considerable precision,which shows that the electromagnetic holographic method is feasible and has good prospects for application.