井下环空流量电磁检测机理及模型试验研究

项目名称： 井下环空流量电磁检测机理及模型试验研究

项目编号： No.51504211

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 矿业工程

项目作者： 葛亮

作者单位： 西南石油大学

项目金额： 20万元

中文摘要： 目前常规微流量控制系统在地面钻井液循环管线上监测有明显的滞后，通过直接测量井下环空流量是解决溢流或漏失等井下事故的有效途径。然而，井下工况复杂，现有环形空间流量检测理论很少，成为制约该项技术推广应用的主要瓶颈。本项目针对差压法与超声波流量检测方法的不足，拟对井下环空流量电磁检测机理开展研究。在考虑井下特殊环境基础上，通过已有的圆形管道电磁最优化检测理论，建立井下环空流量电磁测量电磁学模型并通过边界条件进行求解；进而进行环空流道的流场仿真，基于ANSYS和MATLAB实现井下环空电磁流量测量装置的磁场分布及计算机仿真模型，结合模型仿真分析线圈结构、测量结构、激励磁场以及电极等，实现测量系统的最优结构设计；最后通过搭建多相流环空流量测量模拟实验装置进行实验研究，验证并修正研究的环空流量电磁测量理论模型，为安全钻井过程中井下环空多向流流量电磁测量装置设计提供理论依据。

中文关键词： 安全监控；流量测量；电磁；溢流监测；钻井安全

英文摘要： Normal microflux control system exists obviously supervising delay on the surface drilling fluid circulation pipeline. The downhole disasters of overflow or loss could be solved effectively by measuring the annular return downhole flow directly, which is difficult to develop because of complex downhole condition and lack of annular fluid measuring theory. To remedy the shortage of differential pressure method and ultrasonic method in flow rate measurement, the theory of electromagnetic measurement of downhole annular flow rate is studies in this paper. Based on the electromagnetic optimization measurement theory for round pipeline and the particular downhole environment, the electromagnetic model of the electromagnetic measurement of downhole annular flow is constructed and solved if boundary conditions are provided. And then, based on ANSYS and MATLAB, the magnetic distribution and the computer simulation model of the measuring devices of electromagnetic flow are constructed, and the optimal structure design is completed when coil structure, measuring structure, excited field and electrode are analyzed based on the simulation model. Finally, a multiphase annular flow measurement experiment device is constructed and is used to verify and modify the theory model researched in this paper. The research results provide the theory principle of the electromagnetic measurement device of downhole multiphase annular flow, which may improve the safety of drilling proceeding.

英文关键词： Safety monitoring;Flow detection ;Electromagnetic;Overflow monitoring;Drilling safety