SYSTEM AND PROCEDURE FOR DETERMINATION OF PROPERTIES OF WELL FLUIDS AND THEIR UNCERTAINTY Russian patent published in 2011 - IPC E21B49/10 E21B47/12 

FIELD: gas and oil production.

SUBSTANCE: data on properties of fluid are measured with module of spectrometre of downhole device for at least two fluids. On base of data on fluid properties a level of pollution and uncertainty related to it for each of at least two fluids are quantified. Properties of fluids are determined and stored on base of levels of pollution of at least two fluids. Uncertainty in obtained properties of fluids is quantified and stored. Obtained properties of at least two fluids are compared considering uncertainties of obtained properties of fluids for evaluation and examination of a geological formation. The system consists of a downhole tool and of at least one processor connected with the downhole tool. Also the downhole tool includes a pipeline with an optic cell, a pump connected with the pipeline for supply of formation fluid through the optic cell and a module for analysis of fluid for measurement of data on properties of fluid relative to formation fluid supplied through the cell. The processor consists of a device for obtaining data on fluid properties from the downhole tool and of a device for quantifying level of pollution and uncertainty related to it for each of at least two fluids in real time, receiving data on fluid properties, for determination on base of levels of pollution and for recording properties of fluids and uncertainty related to them.

EFFECT: upgraded accuracy of determination of well fluid properties.

15 cl, 37 dwg