Bohlin instruments, rheological measurements on drilling mud and a crude oil

摘要

The theological properties of crude oil are known to be very dependent on temperature. In order to predict the performance of the crude in "real life conditions", it is important to know the viscosity at high and low temperatures and also to know the temperature where waxing occurs. The rheology of drilling muds is also of significance and to date, many companies have used the Fann viscometer. However, the Fann is unable to make measurements at very low shear rates which must be characterised in order to predict suspension properties. With the advent of modern rheometers like the Bohlin CVO, it is very easy to make these low shear rate measurements and be able to accurately predict the performance of a drilling mud. This report examines some of the typical tests for measuring the rheological properties of drilling mud and crude oil. Actual data and interpretation of results are also attached.