Gongye shui chuli (Jun 2024)
Applying effects evaluation and mechanism research of the supramolecular detergent for oilfield production
Abstract
The inorganic scales have negative effects on the development of oilfields and result in the decrease of economics. This paper analyzed the components and location of the inorganic scales in C oilfields by combining indoor experiments and simulations. A new neutral supramolecular detergent by γ-polyglutamic acid and other agents was prepared. The self-assembly process of the supramolecular system was analyzed and clarified by Materials Studio 2020. Meanwhile, the descaling effect and system applicability of the supramolecular detergent and traditional acidic detergent were compared and evaluated. Molecular simulation by density functional theory(DFT) and indoor experiments were applied to analyze the scale removal mechanisms of the supramolecular system. The results showed that the calcium/magnesium carbonate and ferrous carbonate scales were the main inorganic scales of the typical wells in oilfields at the bottom holes. The removal rates of supramolecular detergent for calcium carbonate scale, calcium sulfate scale and simulated scale were 74.2%, 45.1%, and 65.8%, respectively, which were obviously higher than those of the traditional detergents. The flooding experiments showed that the core injection pressure could be increased 12% after using supramolecular detergent. The optimum temperature of the supramolecular detergent was 40-90 ℃ and the optimum reaction time was 12 hours. The dynamic simulation analysis showed that although steric hindrance affected the adsorption of ions by supramolecular systems, supramolecular systems were more likely to chelate scale samples due to larger intermolecular interactions. The scale removal mechanisms could be summarized as a synergy of supramolecular coordination, supramolecular aggregation and permeation. Therefore, the new supramolecular detergent had a good prospect for application.
Keywords
