A Visual Test Apparatus for Flushing Fluid Evaluation and the Evaluation Method

In flushing fluid evaluation,no standardized methods are available;some evaluation apparatus developed in recent years are not able to simulate the real situation of field operation,and quantitatively evaluate the performance of flushing fluid.A new visual test apparatus for flushing fluid evaluation has recently been developed,which consists of fluid storage tank,circulation pump,flow rate controller,flow meter,simulated wellbore,backflow conduit,heating device,liquid drain,and roller.This apparatus is able to simulate the formulation of flushing fluid,flushing time and flow rate etc.,and the flushing performance can be visually checked because a transparent glass pipe is used as the simulated borehole.The flushing time can be determined by visualization and the critical flow rate can be determined for optimum flushing.As a quantitative,visual evaluation apparatus,it is able to satisfy the needs for field application.