Patent ID: 6769295
Filing Date: 2004-08-03
Classification: G01N

Abstract:
A method of monitoring the evolution of characteristics of a fluid circulating in a well for example, characterized in that the following stages are carried out:obtaining a calibration function depending on the type of detector and nature of the fluid from measurements on said fluid prior to circulating said fluid, carrying out complex dynamic viscosity measurements with a suitable detector arranged on a line through which said fluid circulates, so as to obtain a law of variation of the complex dynamic viscosity &eegr;* as a function of 2&pgr;f, where f is the excitation frequency of the detector, deducing the rheogram of the fluid, i.e. a law of variation of the viscosity h as a function of the shear rate ({dot over (&ggr;)}), from said calibration function and said complex viscosity measurements calculating at least one characteristic parameter of the rheology of the fluid from said rheogram, repeating these stages after a predetermined time interval, deducing from the evolution of said parameter the evolution of the characteristics of the fluid.