Systems and Methods for Downhole Fluid Analysis

A method, comprising:

• placing a downhole tool in a wellbore in a geological formation, wherein the wellbore or the geological formation, or both, contain a formation fluid, and wherein the downhole tool comprises:
• a packer module, wherein the packer module comprises:
• an upper packer and a lower packer configured to seal an interval of the wellbore;
• and
• an inlet disposed between the upper packer and the lower packer, wherein the inlet is configured to admit the formation fluid disposed in the interval into a flow line of the downhole tool;
• a pump out module configured to pump the formation fluid from the inlet;
• a fluid analysis module configured to analyze the formation fluid pumped to the fluid analysis module via the pump out module;
• a sample module comprising a sample chamber containing an external fluid;
• and
• a flow line coupled to the packer module, pump out module, fluid analysis module, and sample module;
• performing downhole fluid analysis using the fluid analysis module to determine a composition of the formation fluid;
• and
• using a processor to:
• identify a condition indicating that pumping by the pump out module is to be stopped;
• stop pumping by the pump out module;
• transfer the external fluid from the sample chamber to the interval via the flowline and the inlet;
• resume pumping of the formation fluid from the inlet via the pump out module;
• and
• output the composition of the formation fluid as determined by the fluid analysis module.

One or more tangible, non-transitory, machine-readable media comprising instructions to:

• receive at least one measurement representative of a formation fluid as analyzed by a downhole tool in a wellbore in a geological formation within a hydrocarbon reservoir, wherein the downhole tool comprises:
• a packer module, wherein the packer module comprises:
• an upper packer and a lower packer configured to seal an interval of the wellbore;
• and
• an inlet disposed between the upper packer and the lower packer, wherein the inlet is configured to admit the formation fluid disposed in the interval into a flow line of the downhole tool;
• a pump out module configured to pump the formation fluid from the inlet;
• a fluid analysis module configured to analyze the formation fluid pumped to the fluid analysis module via the pump out module;
• a sample module comprising a sample chamber containing an external fluid;
• and
• a flow line coupled to the packer module, pump out module, fluid analysis module, and sample module;
• identify a condition indicating that pumping by the pump out module is to be stopped;
• stop pumping by the pump out module;
• transfer the external fluid from the sample chamber to the interval via the flowline and the inlet;
• resume pumping of the formation fluid from the inlet via the pump out module;
• and
• output the composition of the formation fluid as determined by the fluid analysis module.