Nano-fluid thickened oil thermal recovery assistant and preparation method thereof

Abstract

The invention provides a nano-fluid thickened oil thermal recovery assistant and a preparation method thereof. The nano-fluid thickened oil thermal recovery assistant comprises, by volume, 0.01-0.5% of a nano-material, 0-15% of an emulsifier, 0.1-5% of an auxiliary reagent, 0-6% of mineral ions, 0.1-1% of a densifier, 0-30% of a dispersion solvent and the balance water. The preparation method comprises mixing the water, mineral ions, emulsifier, densifier and auxiliary reagent to obtain a uniform solution A, mixing an oil-soluble nano-material and a dispersion solvent to obtain a uniform dispersion solution B, adding the dispersion solution B into the solution A to obtain an emulsion and carrying out ultrasonic dispersion or high speed stirring to obtain a stable emulsion or comprises adding the auxiliary reagent into water, carrying out mixing to obtain a uniform mixture, adding a water-soluble nano-material into the mixture, carrying out uniform dispersion, adding the densifier into the dispersion solution and carrying out mixing to obtain a uniform fluid suspension containing the nano-material.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to a nanofluid thermal recovery additive for heavy oil and a preparation method thereof. Background technique [0002] Heavy oil recovery technologies mainly include thermal recovery (such as steam huff and puff, steam flooding, fire flooding, SAGD, FAST, SAGP, etc.) and cold recovery. According to the specific conditions of the reservoir, thermal recovery of heavy oil is the main development method at this stage. Steam flooding and steam stimulation are two main thermal recovery methods. Steam injection is currently the most important method for exploiting heavy oil reservoirs in the world. The steam provides heat to the rocks and fluids in the oil layer. On the one hand, the viscosity of the crude oil in the oil layer is greatly reduced and the fluidity of the crude oil is increased; Volume expansion, which reduces final residual oil saturation. [00...

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Problems solved by technology

[0007] The above-mentioned prior art is mainly researched on viscosity reduction and plugging of channeling passages, and heavy oil is a bad thermal conductor, which is 6-7 times lower than the thermal conductivity of water, so the injected heat can only be u

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