The article describes an integrated approach to preventing scale formation in horizontal wells of the Sorovskoye field, including analysis of producing and complicated well stock, computer modeling and assessment of the risk of scale precipitation in well conditions, laboratory studies of scale inhibitors, including, among other things, an assessment of the adsorption and desorption of the inhibitor on core material. The obtained results of laboratory studies made it possible to develop high-quality designs of scaling inhibitor (SI) injections into the reservoir, to predict the nature and duration of the injection of the injected inhibitor. The results of field tests confirmed the effectiveness of the proposed approach: no complications associated with the formation of salts on the test objects were identified, the duration of the effect was more than 1 year.
Materials and methods
To determine the adsorption-desorption properties of the scaling inhibitor (adsorption isotherm) in order to obtain quantitative data necessary for calculating the volumes of reagent injection into the reservoir and determining the volumes of protected water, laboratory filtration experiments were carried out on natural core samples from the Sorovskoye field.
All studies were carried out on modern experimental equipment, including an UltraPoroPerm-500 (Core-Lab, USA) unit for determining the porosity and porosity properties of samples, a UIK-5(2) filtration unit (Glo-Bel Oil Service, Moscow), which allows to determine the studied filtration parameters with high accuracy.
scaling, scale inhibitor, squeeze, oil production complications, failure interval, calcite