The future drilling fluid sensor package
21.12.2016Vendors have tested calibration fluids on their instruments in the drilling fluids test loop.
We have had some busy days at IRIS and Ullrigg Drilling and Well Center
. A large team has been involved in project tests with focus on development of standards for calibration and measurement of fluid rheology through use of reference materials for on-site application of automated inline sensors.
Intended calibration fluids have been tested for evaluation of uncertainty in measurement of non-Newtonian rheological behaviour, also studying the effect of variation composition, covering density and particle content. Challenges were experienced related to mixing of polymer reference fluids, performance of reference fluids, air in fluid and in controlling temperature. Solutions were found so the test could be performed, but these issues all need further consideration if a standard is to be developed.
Four different vendors have tested and demonstrated their inline rheometers. Three measurements methods have been used, covering Couette-type, coriolis based and measurement based on pulsed ultrasound velocimetry (PIV) - the last one providing direct measurement of rheology. Measurements were successful, although there is a variation in how much information that is received from each instrument – e.g. the coriolis based instrument only provides viscosity measurement and requires flow-sweep to cover the rheological domain of interest. Most challenging was achieving a representative and stable fluid for proper evaluation of uncertainties.
The team will publish the results. Based on the testing, the team will provide recommendations for further development of methods of calibration, requirements for calibration fluids, and evaluation of disturbances for uncertainty estimates.
The project led by Shell is financed by the European EURAMET program. Participating partners are Statoil and BP, seven National Measurement Institutes, four sensor manufactures and four research institutes. IRIS has been responsible for the tasks Selection of inline rheometer and Full scale verification