Method and apparatus for the downhole characterisation of formation fluids

摘要

Methods and apparatus for investigating a hydrocarbon bearing geological formation traversed by a borehole are disclosed. A borehole tool 10 is used to acquire a sample of fluid in the formation. Compositional analysis of the fluid sample is conducted to provide a determination of the composition of the sample. The sample composition is then related to a model of the thermodynamic behavior of the fluid; i.e., the mass fractions of the fluid components are used as inputs to an equation of state (EOS) to predict the phase behavior of the fluid. With reservoir fluid characterized with respect to its thermodynamic behavior, fluid production parameters, transport properties and commercially useful indicator of the reservoir are computed.