Aerogel particle-carbon dioxide-water-based three-phase foam system for oil field, and application thereof

Abstract

The invention discloses an aerogel particle-carbon dioxide-water-based three-phase foam system for an oil field, and application thereof. The three-phase foam system is prepared from carbon dioxide, aliquid phase and aerogel particles, wherein the liquid phase is an aqueous solution of a foaming agent, a foam enhancer and an inorganic salt aid. According to the invention, the three-phase foam system can uniformly and stably carry aerogel particles with oleophylic and hydrophobic characteristics, so that the aerogel particles are brought into a reservoir, the aerogel particles are uniformly dispersed in the reservoir, a selective plugging effect of plugging water but not plugging oil in a dominant channel in the reservoir is achieved, the water-based carbon dioxide foam oil displacement efficiency and sweep efficiency are enhanced, the purposes of long-period oil stabilization and water control are achieved, and the recovery ratio can be increased; and the addition of the foam enhanceris beneficial to maintaining the overall stability of a three-phase foam system, promotes aerogel particles to be uniformly and stably dispersed in the foam system for a long time, has the characteristics of greenness, no toxicity and no pollution, and is beneficial to promoting the green development of a high-water-content old oil field.

Description

technical field [0001] The invention relates to an airgel particle-carbon dioxide-water-based three-phase foam system for oil fields, and belongs to the fields of carbon sequestration and utilization technology and oil exploitation technology. Background technique [0002] Water flooding is a widely used oilfield development technology. With the deepening of water flooding development, the oil field will gradually enter the stage of high water cut or even extremely high water cut. At this time, the dominant channel of water channeling in the reservoir is formed, the ineffective water circulation is intensified, and the water flooding efficiency drops rapidly. Foam control and flooding is an important means of enhancing oil recovery after water flooding. The water-based foam fluid has a high apparent viscosity and has excellent profile control characteristics of "blocking large but not small, water and not oil", which can improve the oil-water mobility ratio in the reservoir...

AI Technical Summary

Problems solved by technology

However, fly ash particles and nano-silica particles themselves do not have the ability to selectively plug. Although such solid-phase particles can play a certain beneficial plugging effect when the dominant channel needs to be controlled, the long-term accumulation of a large amount in the formation Permanent retention and plugging may consume the displacement energy of the water phase, thereby weakening the oil displacement capacity of the water phase, which is not conducive to the three-phase foam's long-term oil stability and water control performance.

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