Fann 50SL流变仪测试高粘流体爬杆问题的机理研究及解决方法

Mechanism Research on Upward Climbing in High Viscosity Fluid Testing by Fann 50SL and the Solution

摘要:

Fann 50SL高温高压流变仪作为经典的钻井液流变性能测试仪器，为高温钻井液体系的研发发挥了巨大的作用。但采用原装的Fann 50SL流变仪做高粘流体的流变性能测试时，发现流体容易出现爬杆的现象，这个问题会导致测试数据不准确，实验的重复性较差，甚至会由于上爬的样品污染外转筒轴承，导致轴承锈死和驱动电机烧毁的严重问题。通过分析这类流体的流动特性和Fann 50SL的测量原理，找出了影响高粘流体测试数据准确性的原因，并据此设计了2款防爬杆结构，实际安装在Fann 50SL流变仪上使用后，有效地解决了高粘流体的爬杆问题。

Abstract:

As classic drilling fluid rheological properties test instrument, Fann 50SL HTHP (high temperature and high pressure) rheometer has played a great role in the research and development of high temperature drilling fluid system. But the fluid is prone to climb upward when the original Fann 50SL HTHP rheometer is used to test rheological properties of high viscosity fluid, which will result in inaccurate test data and poor reproducibility of experiment, and even polluted bearing lead to serious problems of bearing rust and driving motor burning. Through the analysis on the flow characteristics of the high viscosity fluid and the measuring principle of Fann 50SL, the reasons influencing the accuracy of test data are found out, on this basis, 2 kinds of prevent-climbing structures are designed and installed on Fann 50SL HTHP rheometer, the climbing upward is effectively solved.