METHOD FOR DIAGNOSTICS OF ASSOCIATED WATERS OF GAS CONDENSATE WELLS BASED ON DATA OF THEIR ANALYSIS BY ELECTROCHEMICAL METHODS Russian patent published in 2020 - IPC E21B47/00 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the field of gas industry and can be used in development of gas and gas condensate deposits for implementation of hydrochemical monitoring of water wells with using electrochemical methods of analysing associated water. Objective of the claimed invention is quantitative determination of relative content of formation, condensation and technogenic water in gas carried by gas as per results of instrumental measurements of specific electric conductivity by conductometric method and concentration of main ions of reservoir and technogenic water by potentiometric method. Method of diagnosing associated waters of gas condensate wells based on data of their analysis by electrochemical methods involves sampling of associated water, analysis of concentration of chemical elements in them and calculation of relative content of formation, condensation and industrial water in the gas carried by the gas. Method is characterized by that electrochemical analysis methods are used to determine dependences of the relative content of formation water in a mixture of condensation-formation water and industrial water in condensation-technogenic and formation-industrial water mixtures from specific electric conductivity and concentration of basic ions. Then, a sample of associated water is taken from the production well, its specific electric conductivity and concentration of the main ions are determined using a conductometer and an ionomer directly at the sampling point. Relative content of formation and anthropogenic water in appropriate mixtures is calculated by means of established regression equations. Two-component mixture basic for further calculations is then established in a certain manner and the content of two components of the basic mixture of water and impurities of the third component is calculated from given equations.

EFFECT: technical result is increased efficiency of diagnostics of accompanying water origin due to determination of specific electric conductivity and basic ions in field conditions directly at sampling place, which allows to reduce periods of stop and increase efficiency of wells operation.

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