METHOD FOR PROPERTIES DETERMINATION OF CARBOHYDRATE FORMATION AND FLUIDS PRODUCED IN EXTRACTION PROCESS Russian patent published in 2014 - IPC E21B49/00 G01V1/44 

FIELD: oil and gas industry.

SUBSTANCE: in order to determine properties of carbohydrate formation and fluids produced in extraction process according to the method acoustic signal is registered at least once and the above signal represents response of the well-formation system to acoustic pressure pulses. Source of pressure pulses is an electric submersible pump located inside the well. Acoustic signal is registered by at least one sensor located in bottomhole chamber of the well; the sensor measures at least one quantitative physical parameter of the well-formation system characterising process of acoustic signal propagation in the well. Mathematical model is created for acoustic pressure pulses in bottomhole chamber and data obtained by modelling are compared with data obtained by registration of acoustic signal representing response of the well-formation system. Formation parametres are adjusted in mathematical model to ensure compliance of at least one quantitative physical parameter of the well-formation system obtained by modelling with the same quantitative physical parameter obtained by registration; thereafter properties of formation and produced fluids are determined as parametres ensuring compliance.

EFFECT: determining characteristics of bottomhole area parametres and obtaining better characteristics of formation at the border of formation and well.

19 cl, 3 dwg