METHOD FOR DIAGNOSTICS OF ASSOCIATED WATER OF GAS WELLS BASED ON CHEMICAL ANALYSIS DATA Russian patent published in 2019 - IPC E21B47/00 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to gas industry and can be used in development of gas and gas condensate deposits for implementation of hydrochemical monitoring of water-cut of production wells. Objective of the claimed invention is quantitative determination of relative content of formation, condensation and industrial water as per data of chemical analysis of samples of associated water on main macrocomponents. Method of diagnosing associated waters of gas wells using chemical analysis data involves sampling of associated waters, analysis of concentration of chemical elements in samples and calculation of relative content of formation, condensation and man-made water. Method is characterized by that regression equations are pre-established for two-component mixtures of associated water, reflecting dependences of relative content of formation water in a mixture of condensation-formation water and industrial water in condensation-technogenic and formation-industrial water mixtures on concentration of basic ions and total mineralization. Then samples of associated waters are sampled, chemical analysis is performed and values of concentration of main ions and total mineralization are included in regression equations, from which relative content of formation and industrial water in corresponding mixtures is calculated. 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 of claimed invention is expressed in improvement of efficiency of hydrochemical monitoring of water wells of production wells due to more complete account of hydrochemical conditions of specific area of works and formulas of used process solutions while reducing list of used correlation elements.

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