Preparation method of composite thick oil viscosity reducer

Abstract

The invention belongs to the field of petroleum development, and particularly discloses a preparation method of a composite thick oil viscosity reducer. The preparation method comprises the followingsteps: condensing an intermediate 8 and oxalic acid under the action of 1-hydroxybenzotriazole, and reacting with a composite carrier to perform dehydration condensation on the residual carboxyl of oxalic acid and active hydroxyl on the composite carrier, thereby obtaining a viscosity reducing additive. The side chain of the additive contains a large amount of long-chain alkyl, and the long-chainalkyl is a non-polar chain segment so that the hydrogen bond strength between colloid and asphaltene molecules in thickened oil can be reduced, the external environment of an asphaltene aggregate is converted into non-polarity, the colloid and the asphaltene cannot be gathered, the side chain contains rigid structures such as benzene rings and a large number of conjugated pi bonds so that the heavy oil viscosity reducer is more easily included in a colloid and asphaltene stacked structure, and a very good effect can be achieved when the use amount of the heavy oil viscosity reducer is relatively small.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a preparation method of a composite heavy oil viscosity reducer. Background technique [0002] Most of the world's oil resources are unconventional oil resources, which have the characteristics of high condensation and high viscosity. Most of the oil resources belong to the "three high" heavy oil with high freezing point, high viscosity and high wax content. While the reserves of conventional oil resources are gradually decreasing, the development and utilization of unconventional oil resources has become increasingly important. However, unconventional oil has brought great difficulties to the mining and transportation process due to its high freezing point and high viscosity. The content of asphaltene and wax in heavy oil is relatively high. This kind of heavy oil may lose fluidity and solidify due to the precipitation of wax and asphaltene at room temperature, c...

AI Technical Summary

Problems solved by technology

[0003] When the existing heavy oil viscosity reducer is used to reduce the viscosity of high viscosity heavy oil, the viscosity reduction rate of heavy oil is not high, and in the high temperature environment, the performance of the heavy oil viscosity reducer is obviously reduced, and the viscosity reducer currently on the market In order to achieve the viscosity reduction effect, a large amount of viscous oil viscosity reduction agent needs to be added, which increases the cost of viscosity reduction

Images