Methods and systems for estimation of oil formation volume factor

A method, comprising:

• obtaining a contaminated fluid sample from a reservoir at a downhole location in a borehole, the contaminated fluid sample containing fluid and oil based mud filtrate;
• providing a processor with at least one property of the contaminated fluid sample;
• and
• using a contamination monitoring module and sensors at the downhole location to obtain data on the fluid;
• and
• processing the data obtained downhole to determine an FVF of oil in the reservoir.

A system, comprising:

• a well string comprising a sampling system deployed downhole in a wellbore, the sampling system comprising a contamination monitoring module;
• a processor configured to process the data;
• and
• a non-transitory tangible machine-readable memory coupled to the processor, the non-transitory tangible machine-readable memory storing machine-readable instructions that when executed by the processor cause the processor to perform operations comprising:
• measuring downhole saturation pressures of a contaminated fluid over a pumpout volume or a pumpout time, wherein the contaminated fluid comprises fluid and OBM filtrate;
• determining a function for the measured saturation pressures based on the pumpout volume or pumpout time;
• extrapolating the function to infinite pumpout volume or infinite pumpout time;
• determining a saturation pressure for the fluid at the infinite pumping volume or infinite pumping time;
• obtaining a saturation pressure of the fluid;
• and
• processing the data obtained downhole to determine an FVF of oil in the reservoir.