Systems and Methods for Pump Control Based on Estimated Saturation Pressure of Flow-Line Fluid with its Associated Uncertainty During Sampling Operations and Application Thereof

A downhole fluid testing system, comprising:

• a downhole acquisition tool housing configured to be moved into a wellbore in a geological formation, wherein the wellbore or the geological formation, or both, contain fluid that comprises a native reservoir fluid of the geological formation and a contaminant;
• a pump configured to pump fluid through the downhole acquisition tool;
• an optical spectrometer comprising at least one sensor disposed in the downhole acquisition tool housing, wherein the at least one sensor is configured to receive a first plurality of measurements and to analyze portions of the fluid and obtain a fluid property of the fluid from an optical spectrometer, wherein the fluid property includes an optical density;
• and
• a controller comprising memory circuitry and processing circuitry, wherein the controller is communicatively coupled to a surface level of the housing, and wherein the controller is configured to:
• receive the first plurality of measurements over time from the at least one sensor;
• estimate a future saturation pressure of the fluid and a value of an associated uncertainty within the flow line at specific time increments via the processing circuitry based at least in part on the first plurality of measurements and a saturation pressure model;
• and
• control a flow rate of the pump that causes the flow line pressure to remain above the estimated future saturation pressure plus the value of the associated uncertainty.

A method comprising:

• pumping fluid from outside of a downhole tool through a flow line of the downhole tool with a pump;
• taking a first plurality of measurements over time using at least one sensor;
• estimating a future saturation pressure of the fluid within the flow line and a value of its uncertainty at defined time increments via a downhole controller based at least in part on the first plurality of measurements and a first saturation pressure model;
• adjusting the flow line pressure to maintain the pressure of the flow line above the estimated future saturation pressure;
• and
• using a surface controller at the surface to estimate the future saturation pressure when the flow line pressure goes below a saturation pressure of the flow line, based at least upon the first plurality of measurements and a second saturation pressure model.