System and methods of deriving differential fluid properties of downhole fluids

A method of reducing systematic errors in downhole data, the method comprising:

• obtaining a sample of a first fluid;
• obtaining a sample of a second fluid;
• acquiring downhole data sequentially for at least the first and the second fluid at substantially the same downhole conditions with a device in a borehole;
• deriving respective fluid properties of the first and second fluids based on the downhole data for the first and second fluid;
• storing the derived fluid properties;
• and
• quantifying uncertainty in the derived fluid properties.

A downhole fluid characterization apparatus, comprising:

• a fluid analysis module, the fluid analysis module comprising:
• a flowline for fluids withdrawn from a formation to flow through the fluid analysis module;
• a selectively operable device structured and arranged with respect to the flowline for flowing and trapping at least a first and a second fluid through the fluid analysis module;
• and
• at least one sensor associated with the fluid analysis module for generating fluid property data for the first and second fluid at substantially the same downhole conditions, and quantifying uncertainty in fluid properties.

A system for characterizing formation fluids and providing answer products based upon the characterization, the system comprising:

• a borehole tool including:
• a flowline with an optical cell,
• a selectively operable device associated with the flowline for flowing and trapping at least a first and a second fluid through the optical cell, and
• a fluid analyzer optically coupled to the cell and configured to produce fluid property data with respect to the first and second fluid flowing through the cell;
• and
• at least one processor, coupled to the borehole tool, comprising:
• means for receiving fluid property data from the borehole tool, wherein the fluid property data are generated with the first and second fluid at substantially the same downhole conditions,
• the processor being configured to derive respective fluid properties of the first and second fluid based on the fluid property data, and to quantify uncertainty in the derived fluid properties.

A computer usable medium having computer readable program code thereon, which when executed by a computer, adapted for use with a borehole system for characterizing downhole fluids, comprises:

• receiving fluid property data for at least a first and a second downhole fluid, wherein the fluid property data of the first and second fluid are generated with a device in a borehole at substantially the same downhole conditions;
• calculating respective fluid properties of the fluids based on the received data;
• storing the respective fluid properties;
• and
• quantifying uncertainty in the derived fluid properties.