Cold water fat-soluble dissolving nano oil-displacing agent for heavy oil injection and its preparation method and application

Abstract

The invention discloses a fat-soluble dissolving nano-oil-displacing agent HCD for heavy oil injection cold water, which comprises the following components by weight percentage: 10-50% of ester compounds, 5-30% of alcohol compounds, amine compounds or ethers Compounds 0-20%, sodium or ammonium salts 0-35%, wetting agents 0-20%, aldehydes 0-20%, biosurfactants 0-20% and acidic substances 0-20%; and HCD The preparation method and its application in oil field exploitation and pipeline oil fast transportation. The HCD prepared by the method is characterized by strong fat solubility, water solubility, viscosity reduction, throat expansion through slits, weak oil wetness, low tension, high oil displacement efficiency, safety and environmental protection, entering into the nano-gap of heavy oil, nonpolar fat solubility It dissolves paraffin, asphalt and colloid, sharply reduces viscosity, makes heavy oil thin and easy to produce and easy to transport in pipelines, and realizes low-cost and high-efficiency large-scale industrial production of naphthenic heavy oil, ultra-heavy oil and other heavy oil.

Description

technical field [0001] The invention relates to the technical field of underground energy exploitation, in particular to a heavy oil flooding cold water fat-soluble dissolving nano oil displacement agent and a preparation method thereof, and the use of the nano oil displacement agent for heavy oil exploitation and pipeline oil rapid oil transportation Methods. Background technique [0002] The distribution of heavy oil reservoirs is very wide. The potential reserves of heavy oil (including bitumen) in the world may be about 6 times that of the proven conventional crude oil reserves. 8 t, my country's heavy oil resources are also quite rich and widely distributed. Among them, naphthenic heavy oil is a scarce resource, and its reserves only account for 2.2% of the world's proven oil reserves. It is a "rare metal" material used in aerospace and space satellites. It has the characteristics of high value, high density, high viscosity, high colloid, high residual carbon content ...

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Problems solved by technology

[0008] When the rod pumping well exploits heavy oil, due to the high viscosity and high wax content, the oil flow channel of the tubing is reduced, the upward and downward resistance of the sucker rod string increases, and the mutual influence and collision of the donkey heads often lead to The sucker rod is stuck and broken, and the well is blocked at low temperature; when the electric submersible pump is exploiting heavy oil, the large displacement causes the pressure at the suction port to be low, and wax deposition is easy to cause blockage of the vane guide wheel flow channel at low temperature, frequent shutdown, and frequent downhole accidents

[0009] Sand discharge cold recovery technology, heating viscosity reduction technology (steam heating and electric heating), low-frequency pulse oil recovery technology, thinning viscosity reduction technology, microwave viscosity reduction technology, magnetic viscosity reduction technology, carbon dioxide injection, nitrogen injection, air injection and other physical reduction technologies Viscosity method, which has a certain effect on ordinary heavy oil, but can only be used in the early stage, and has almost no effect on extra heavy oil, super heavy oil, naphthenic heavy oil; emulsification viscosity reduction, oil-soluble viscosity reduction agent, viscosity reduction, pour point reduction Chemical viscosity reduction methods such as chemical viscosity reduction, emulsion breaking, adsorption viscosity reduction, and alkali flooding have little effect on extra heavy oil, super heavy oil, and naphthenic heavy oil.

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