Thickened oil cold-water-injected fat-soluble dissolving nano oil-displacing agent as well as preparation method and application of nano oil-displacing agent

Abstract

The invention discloses a thickened oil cold-water-injected fat-soluble dissolving nano oil-displacing agent HCD that comprises the following components in percentage by weight: 10-50% of ester compound, 5-30% of alcohol compound, 0-20% of amine compound or ether compound, 0-35% of sodium salt or ammonium salt, 0-20% of wetting agent, 0-20% of aldehyde compound, 0-20% of biosurfactant and 0-20% ofacidic substance. The invention further discloses a preparation method of the HCD and application of the HCD in oil field exploitation and rapid pipeline petroleum transportation. The HCD prepared bythe invention has the characteristics of strong fat solubility, water solubility, viscosity reduction, through-seam throat expansion, weak oil wetness, low tension, high oil displacement efficiency,safety and environmental protection; according to the invention, the oil displacing agent enters the nanometer gaps of the thickened oil; paraffin, asphalt and colloid are dissolved in a non-polar fat-soluble manner, the thickened oil is thinned by rapid viscosity reduction, the production is easy, the pipeline transportation is easy, and the low-cost and high-benefit large-scale industrial production of naphthenic thickened oil, super thickened oil and other thickened oil is realized.

Description

Technical field [0001] The present invention relates to the technical field of underground energy exploitation, and more specifically to a heavy oil injection cold water fat-soluble dissolving nano oil-displacing agent and a preparation method thereof, and using the nano-oil-displacing agent for heavy oil exploitation and pipeline petroleum 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 the proven reserves of conventional crude oil, and the geological reserves of heavy oil (including bitumen) reservoirs are as high as 15500×10 8 t, my country's heavy oil resources are also quite abundant and widely distributed. Among them, cycloalkyl heavy oil is a scarce resource, and its reserves account for only 2.2% of the world’s proven oil reserves. It is a "rare metal" material for aerospace and space satellites. Because cycloalky...

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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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