Equipment and method for preparing supercritical carbon dioxide microemulsion and fly ash particle compound dispersion

Abstract

The invention relates to the technical field of oil-gas field development and oil extraction engineering, and discloses equipment and method for preparing a supercritical carbon dioxide microemulsionand fly ash particle compound dispersion. When the supercritical carbon dioxide microemulsion and fly ash particle compounded dispersion prepared by the equipment and the method flows in an oil reservoir stratum, due to the fact that the fly ash particles are solubilized in the dispersed phase the probability of contact between the fly ash particles and a pore throat wall surface of the stratum can be greatly reduced, the adsorption amount is reduced, and the utilization efficiency is improved; when the dispersion is in contact with stratum water in the stratum, reverse microemulsion of water-in-carbon dioxide can be converted into dioxide-in-water carbon emulsion, namely carbon dioxide foam, and in the conversion process, the fly ash nano particles can be adsorbed on a gas-liquid interface to hinder gas diffusion among bubbles, so that the strength of a bubble liquid film is improved, the stability of the foam is enhanced, the carbon dioxide fluidity is controlled, and the crude oil recovery is enhanced.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development and production engineering, in particular to a preparation equipment and method for a compound dispersion of supercritical carbon dioxide microemulsion and fly ash particles. Background technique [0002] As a gas displacement agent, carbon dioxide is widely used in the field of oil and gas field development, involving various aspects such as carbon dioxide flooding of thin oil and carbon dioxide huff and puff of heavy oil. However, due to the low viscosity and low density of carbon dioxide itself, when carbon dioxide flows in the formation, it is easy to produce viscous fingering and gravity differentiation, which makes carbon dioxide bypass the displaced crude oil and channel along high-permeability channels, reducing the The spread of carbon dioxide affects the efficiency, so that it produces ineffective injection and wastes manpower and material resources. Especially in ...

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Problems solved by technology

[0010] The purpose of the present invention is to overcome the difficulty of injecting nanoparticles in the prior art, which is easily absorbed by the formation to reduce its utilization efficiency and shorten its radius of action in the formation; the foam produced by the surfactant is subject to its own thermodynamic instability. The impact of the influence, the stability is poor, and the fluidity control action time is short; the nano-particles are expensive and cannot be applied on a large scale. A kind of supercritical carbon dioxide microemulsion and fly ash particle compound dispersion preparation equipment and method are provided. This method can realize the adjustability of fly ash particle size, and improve the scope of application of this type of compound dispersion; this method uses supercritical carbon dioxide as the continuous phase, and the surfactant solution dissolved with fly ash nanoparticles as the dispersed phase , can reduce the adsorption amount of fly ash particles when flowing in the formation, thereby improving its utilization efficiency, and fly ash nanoparticles will be adsorbed on the gas-liquid interface during the steering process, which can enhance the stability of the foam and realize the reduction of carbon dioxide Fluidity control; at the same time, this method turns fly ash particles into treasures, realizes resource utilization and reduces costs

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