Preparation method of composite thick oil viscosity reducer

A technology for viscosity reducer and conditions for heavy oil, applied in the field of preparation of compound heavy oil viscosity reducer, can solve the problems of increased viscosity reduction cost, reduced performance of heavy oil viscosity reducer, low viscosity reduction rate of heavy oil, etc. The effect of viscosity reduction

CN112321768AActive Publication Date: 2021-02-05山东奥士德石油技术有限公司 +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2021-02-05

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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.
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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...

Examples

Embodiment 1

[0046] A preparation method of a composite heavy oil viscosity reducer, specifically comprising the steps of:

[0047] Step S1: Add acrylamide, sodium p-styrenesulfonate, 2-acrylamido-2-methylpropanesulfonic acid, and deionized water into the reaction kettle, and stir until the propylene Amide, sodium p-styrenesulfonate, and 2-acrylamido-2-methylpropanesulfonic acid are completely dissolved to obtain a mixed solution;

[0048] Step S2: Disperse the viscosity-reducing additive in ethanol, stir at a rotational speed of 200r / min, add the mixed solution and azobisisobutyronitrile, and react for 8 hours at a temperature of 70°C , under the condition that the temperature is 110°C, carry out distillation to remove the distillate, and obtain the compound heavy oil viscosity reducer.

[0049] Described viscosity-reducing additive is made by following steps:

[0050] Step A1: Add concentrated sulfuric acid and deionized water into the reaction kettle, stir for 10 minutes at a speed of...

Embodiment 2

[0056] A preparation method of a composite heavy oil viscosity reducer, specifically comprising the steps of:

[0057] Step S1: Add acrylamide, sodium p-styrenesulfonate, 2-acrylamido-2-methylpropanesulfonic acid, and deionized water into the reaction kettle, and stir until the propylene Amide, sodium p-styrenesulfonate, and 2-acrylamido-2-methylpropanesulfonic acid are completely dissolved to obtain a mixed solution;

[0058] Step S2: Disperse the viscosity-reducing additive in ethanol, stir at a speed of 300r / min, add the mixed solution and azobisisobutyronitrile, and react for 10 hours at a temperature of 70°C , under the condition that the temperature is 110°C, carry out distillation to remove the distillate, and obtain the compound heavy oil viscosity reducer.

[0059] Described viscosity-reducing additive is made by following steps:

[0060] Step A1: Add concentrated sulfuric acid and deionized water into the reaction kettle, stir for 10 minutes at a speed of 800 r / min...

Embodiment 3

[0066] A preparation method of a composite heavy oil viscosity reducer, specifically comprising the steps of:

[0067] Step S1: Add acrylamide, sodium p-styrenesulfonate, 2-acrylamido-2-methylpropanesulfonic acid, and deionized water into the reaction kettle, and stir until the propylene Amide, sodium p-styrenesulfonate, and 2-acrylamido-2-methylpropanesulfonic acid are completely dissolved to obtain a mixed solution;

[0068] Step S2: Disperse the viscosity-reducing additive in ethanol, stir at a speed of 300r / min, add the mixed solution and azobisisobutyronitrile, and react for 10 hours at a temperature of 80°C , under the condition that the temperature is 120°C, carry out distillation to remove the distillate, and obtain the compound heavy oil viscosity reducer.

[0069] Described viscosity-reducing additive is made by following steps:

[0070] Step A1: Add concentrated sulfuric acid and deionized water into the reaction kettle, stir for 15 minutes at a speed of 800 r / min...