OPTIMISATION METHOD OF THERMAL STEAM IMPACT DURING DEVELOPMENT OF DEPOSIT WITH HIGH-VISCOSITY OILS AND BITUMENS Russian patent published in 2012 - IPC E21B43/24 

FIELD: oil and gas industry.

SUBSTANCE: method consists in use of injection and production wells and control of volumes of areal steam injection to formation. According to the invention, thermohydrodynamic prediction model of thermal steam impact is used; for that purpose, at the initial development stage the steam is supplied to all injection and production wells, and the following criteria are accepted as optimisation ones at this stage: steam-oil ratio with independent variables in the form of volume of injected steam and number of injection cycles and dependent variable in the form of duration of formation soaking after steam injection; additional oil and bitumen production with independent variables in the form of injected steam volume, number of injection cycles and steam heating rate and dependent variable in the form of duration of effective well operation after steam injection. After that, the change-over is made to steam injection through injection wells and to oil and bitumen production through production wells, and the following criteria are accepted as optimisation ones at this stage: accumulated steam-oil ratio with independent variables in the form of volume of pumped steam, permeability and grittiness of formation, and dependent variable in the form of steam injection rate; oil extraction coefficient with independent variables in the form of volume of pumped steam and formation permeability and dependent variable in the form of steam injection rate. At that, permeability, grittiness and intake of formation is determined as per the data of hydrodynamic investigations, profiles of influx and influx of formation.

EFFECT: optimisation of oil displacement process by means of steam without using any data relative to amount of the heat injected to formation and experience in the preceding development of deposit by means of thermal steam method.

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