井下在线核磁共振流体分析实验方法

摘要

This paper tries to develop measurement methods for the multi‐functional down‐hole nuclear magnetic resonance fluid analyzer .The aim is to monitor the pollution of the formation fluids and quantitatively evaluate NM R characteristics of the fluids at reservoir conditions .Based on the designed prototype ,measurement methods are emphatically researched .The single coil model is built ,and it studies the influence of flowing fluid on the longitudinal relaxation time from the physical mechanism of signal detection .A kind of measuring and processing method is developed for the diffusion coefficient .In this article experiments with the prototype sensor are done and verified . T he online measurements are realized to obtain longitudinal relaxation time (flowing fluids) ,transverse relaxation time and diffusion coefficient (static fluids) .%通过发展井下多功能核磁共振流体分析实验方法，达到对储层条件下地层流体污染程度的监控和流体特性的量化评价。以实验样机为基础，着重研究了在线获取样品信息探测的方法。建立单线圈模型研究流动测量纵向弛豫时间，从信号检测的物理机制入手，研究运动测量对信号的影响；发展了一种测量处理扩散系数的方法；利用制作的样机进行了验证性实验，实现了纵向弛豫时间（流动流体）、横向弛豫时间和扩散系数（静止流体）参数在线测量。