Novel oil soluble viscosity breaking agent for thickened oil recovery

Abstract

The invention relates to a novel oil soluble viscosity breaking agent for thickened oil recovery. The novel oil soluble viscosity breaking agent for thickened oil recovery consists of the following raw materials in part by weight: 60 to 80 parts of maleic anhydride, 10 to 20 parts of para-hydroxyl anisole, 130 to 170 parts of methylbenzene, 2 to 4 parts of crylic acid, 3 to 5 parts of para-toluenesulfonic acid, 0.2 to 0.6 part of azodiisobutyronitrile and 260 to 300 parts of dichloroethane. The novel oil soluble viscosity breaking agent for thickened oil recovery is prepared by the following steps of: adding the maleic anhydride, the para-hydroxyl anisole and the methylbenzene into a reaction kettle; stirring and heating to 80 DEG C; after dissolution, adding the crylic acid and the para-toluenesulfonic acid; performing reflux reaction for 3 to 4 hours; cooling to room temperature; filtering to obtain a maleic anhydride solvent; placing the maleic anhydride solvent into the dichloroethane; heating to 60 DEG C; stirring for 2 to 3 hours; adding the azodiisobutyronitrile under the condition of introducing nitrogen; heating to 90 to 100 DEG C; after 4 hours, stopping heating; washing by using a 10 percent sodium hydroxide solution until the material is alkalescent; washing by using distilled water until the material is neutral; drying at the temperature of 40 DEG C for 6 hours, wherein the vacuum degree is -0.02 to -0.03 mpa; filtering; drying at the temperature of 60 DEG C for 4 to 6 hours, wherein the vacuum degree is -0.05 to -0.06 mpa; and cooling to room temperature to obtain the novel oil soluble viscosity breaking agent. The novel oil soluble viscosity breaking agent is needed to be used together with thin oil, wherein the ratio of the viscosity breaking agent to the thin oil is 1:4; and the adding amount of the pure agent is 1,300 to 5,000 ppm.

Description

technical field

[0001] The invention relates to a viscosity-reducing technology for heavy oil exploitation, in particular to a novel oil-soluble viscosity-reducing agent obtained, which can realize the technical effects of reducing the thinning amount of heavy oil, reducing the viscosity of heavy oil and cold recovery of heavy oil. Background technique

[0002] Heavy oil is called heavy oil because of its high viscosity and high density. The so-called heavy oil is named after relatively thin oil. The problem in the production of heavy oil is: under the conditions of the reservoir, the crude oil has a certain fluidity and good oil supply capacity due to the effect of temperature and pressure. During the oil production process, the crude oil enters the wellbore and flows to the surface. , the pressure decreases, the viscosity of crude oil increases, and gradually loses its fluidity at about 3000m, and the crude oil cannot flow to the wellhead; in view of the characteristics o...