A kind of nano foam oil displacement agent and preparation method thereof

Abstract

The invention belongs to the field of oil recovery technology, and in particular relates to a nano-foam oil displacement agent and a preparation method thereof. The oil displacement agent comprises the following components in weight percentage: 10-45% of anionic surfactant, 7-15% of zwitterionic surfactant, 6-12% of oily nanoparticles, 5-10% of stabilizer, and 1-10% of dispersant 2%, the balance is water. The preparation method of the oil-displacing agent is as follows: prepare oily nanoparticles through solid paraffin and isooctanoic acid, then disperse the oily nanoparticles in water and mix them with a surfactant, then add a stabilizer and water to make a nano-foam oil-displacing agent . The nano-foam oil displacement agent can effectively inhibit gas diffusion, enhance the mechanical stability and viscosity of the liquid film, effectively isolate the transfer of external heat to the interior, reduce the thermal movement rate of molecules, greatly slow down the liquid separation rate of the foam liquid film, and enhance the foam's stability. stability, thereby improving the oil displacement efficiency.

Description

technical field [0001] The invention belongs to the field of oil recovery technology, and in particular relates to a nano-foam oil displacement agent and a preparation method thereof. Background technique [0002] With the increase of the world's energy demand, the rational development and utilization of oil has attracted great attention, and the requirements for the amount and efficiency of oil extraction are also getting higher and higher. Realizing the efficient exploitation of oil and gas resources not only has practical significance for increasing crude oil production, but also has important strategic significance. After primary and secondary extraction of underground crude oil, most of the crude oil remains in the formation. The tertiary oil recovery technology is a technology that uses chemical agents to enhance oil recovery. Among them, foam flooding is considered to be a promising tertiary oil recovery method because of its good plugging performance and selectivity...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem that the foam of the existing foam oil displacement agent is unstable when encountering oil, the present invention provides a nano-foam oil displacement agent, which improves the foam stability of the foam oil displacement agent by adding oily nanoparticles