A kind of preparation method of composite heavy oil viscosity reducer

Abstract

The invention belongs to the field of petroleum development, and specifically discloses a preparation method of a composite heavy oil viscosity reducer, by condensing intermediate 8 and oxalic acid under the use of 1-hydroxybenzotriazole, and then compounding The carrier reacts to make the remaining carboxyl group of oxalic acid dehydrate and condense with the active hydroxyl group on the composite carrier to obtain a viscosity-reducing additive. The side chain of the additive contains a large number of long-chain alkyl groups, and the long-chain alkyl groups are non-polar The neutral segment can reduce the hydrogen bond strength between the colloid and asphaltene molecules in heavy oil, making the external environment of the asphaltene aggregate change to non-polar, so that the colloid and asphaltene cannot be aggregated, and the side chain contains benzene Rigid structures such as rings, and containing a large number of conjugated π bonds, make it easier for the heavy oil viscosity reducer to be included in the stacking structure of colloids and asphaltene, so that a small amount of heavy oil viscosity reducer can achieve good results.

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...

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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

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