Determining wellbore fluid properties

A computer program product for determining a property of a wellbore fluid, the computer program product comprising computer readable instructions embodied on tangible media that are operable when executed to perform operations comprising:

• receiving one or more images of a wellbore fluid sample that at least partially fills a vertically-oriented conduit;
• determining a steady-state level of the wellbore fluid sample within the conduit based on the one or more images;
• determining a time duration to fill the conduit with the wellbore fluid sample to the steady-state level based on the one or more images;
• and
• determining the property of the wellbore fluid based at least in part on the steady-state level and the time duration
• where the property comprises a viscosity of the wellbore fluid determined at least in part on a density of the wellbore fluid and a dimension of the conduit based on the equation:
• μ=[(ρ×g×r2×t)/8]×[(hss−h(t)/h2(t))];
• where μ is the viscosity, ρ is a density of the wellbore fluid, g is gravitational acceleration, h is a height of the conduit, r is a radius of the conduit, t is the time duration, hss is the steady state level, and h(t) is a height of the wellbore fluid as a function of the time.