1. A preparation method of a composite demulsifier for oil extraction is characterized by comprising the following steps: comprises the following components in percentage by weight:

the method comprises the following steps:

1) mixing ethylene glycol and stearic acid amide propyl dimethyl alkyl quaternary ammonium salt, and stirring for 15-30 minutes at normal temperature under the condition of stirring speed of 600-;

2) adding sodium hydroxide into the mixture, and stirring for 15-30 minutes under the same conditions to uniformly mix the mixture;

3) to the above mixture was slowly added the dendritic polyamidoamine C₁₁₀H₁₇₆N₂₆O₄₄Na₁₆The stirring speed is increased to 2000-;

4) slowly adding dendritic polyamidoamine C to the mixture₄₆H₇₂N₁₀O₂₀Na₈Stirring for 40-60 minutes under the stirring condition of 2000-5000r/min, and uniformly mixing to obtain the product.

2. The preparation method of the composite demulsifier for oil recovery according to claim 1, which is characterized by comprising the following steps: dendritic polyamidoamine C is firstly₁₁₀H₁₇₆N₂₆O₄₄Na₁₆And dendritic polyamidoamine C₄₆H₇₂N₁₀O₂₀Na₈Pre-mixing uniformly, adding into the mixture obtained in step 3, and stirring at the stirring speed of 2000-.

3. The preparation method of the composite demulsifier for oil recovery according to claim 1, which is characterized by comprising the following steps: step 1), stirring for 30 minutes at normal temperature under the condition of a stirring speed of 600 r/min.

4. The preparation method of the composite demulsifier for oil recovery according to claim 1, which is characterized by comprising the following steps: step 1), stirring at the stirring speed of 1000r/min for 15 minutes at normal temperature.

5. The preparation method of the composite demulsifier for oil recovery according to claim 1, which is characterized by comprising the following steps: and 3) stirring at 2000r/min under other conditions for 60 minutes.

6. The preparation method of the composite demulsifier for oil recovery according to claim 1, which is characterized by comprising the following steps: and 3) stirring at 5000r/min for 40 min under other conditions.

7. The preparation method of the composite demulsifier for oil recovery according to claim 1, which is characterized by comprising the following steps: and 4) stirring at 2000r/min under other conditions for 60 minutes.

8. The preparation method of the composite demulsifier for oil recovery according to claim 1, which is characterized by comprising the following steps: and 4) stirring at 5000r/min for 40 min under other conditions.

Background

The demulsification and dehydration of crude oil emulsion is an important step in the process of petroleum production and processing, at present, because the continuous development of petroleum and various novel oil extraction technologies are applied to the exploitation of petroleum, the stability of crude oil emulsion is stronger and stronger, and the difficulty of crude oil demulsification and dehydration is larger and larger, therefore, the research develops the high-efficiency composite demulsifier more suitable for production needs through continuous research and exploration.

Disclosure of Invention

The invention aims to provide a preparation method of a composite demulsifier for oil extraction. In order to achieve the above object, the present invention provides the following technical solutions.

The preparation method of the composite demulsifier for oil extraction comprises the following components in percentage by weight:

the method comprises the following steps:

1. mixing ethylene glycol and stearic acid amide propyl dimethyl alkyl quaternary ammonium salt, and stirring for 15-30 minutes at normal temperature under the condition of stirring speed of 600-;

2. adding sodium hydroxide into the mixture, and stirring for 15-30 minutes under the same conditions to uniformly mix the mixture;

3. to the above mixture was slowly added the dendritic polyamidoamine C₁₁₀H₁₇₆N₂₆O₄₄Na₁₆The stirring speed is increased to 2000-;

4. slowly adding dendritic polyamidoamine C to the mixture₄₆H₇₂N₁₀O₂₀Na₈Stirring for 40-60 minutes under the stirring condition of 2000-5000r/min, and uniformly mixing to obtain the product.

Further, in the above method, the dendritic polyamidoamine C may be first prepared₁₁₀H₁₇₆N₂₆O₄₄Na₁₆And dendritic polyamidoamine C₄₆H₇₂N₁₀O₂₀Na₈Pre-mixing uniformly, adding into the mixture obtained in step 3, and stirring at the stirring speed of 2000-.

The invention has the beneficial effects that:

the method is carried out at normal temperature, the preparation is simple, the raw materials are easy to obtain, the obtained product demulsifier has strong crude oil dehydration capability, the dehydration rate reaches 95.2-95.8%, and the effect is ideal.

Detailed Description

In the following examples of the present invention, unless otherwise specified, the parts and percentages are by mass. It is unmistakable that, unlike the parts by mass, the sum of the parts by mass of all the components is not limited to 100 parts.

The invention provides a preparation method of a composite demulsifier for oil extraction, which comprises the following components in percentage by weight:

the method comprises the following steps:

1. mixing ethylene glycol and stearic acid amide propyl dimethyl alkyl quaternary ammonium salt, and stirring for 15-30 minutes at normal temperature under the condition of stirring speed of 600-;

2. adding sodium hydroxide into the mixture, and stirring for 15-30 minutes under the same conditions to uniformly mix the mixture;

3. to the above mixture was slowly added the dendritic polyamidoamine C₁₁₀H₁₇₆N₂₆O₄₄Na₁₆The stirring speed is increased to 2000-;

4. slowly adding dendritic polyamidoamine C to the mixture₄₆H₇₂N₁₀O₂₀Na₈Stirring for 40-60 minutes under the stirring condition of 2000-5000r/min, and uniformly mixing to obtain the product.

Example 1: adding 66g of ethylene glycol into a beaker, adding 13g of stearic acid amide propyl dimethyl alkyl quaternary ammonium salt, uniformly stirring, adding 1g of sodium hydroxide, uniformly stirring, and adding dendritic polyamidoamine C₁₁₀H₁₇₆N₂₆O₄₄Na₁₆5g of polyanilide C are stirred homogeneously and finally the dendritic polyamidoamine C is added₄₆H₇₂N₁₀O₂₀Na₈-15g stirring well.

Example 2: 48g of ethylene glycol was added to a beaker and thenAdding 20g of stearic acid amide propyl dimethyl alkyl quaternary ammonium salt, stirring uniformly, adding 2g of sodium hydroxide, stirring uniformly, adding dendritic polyamidoamine C₁₁₀H₁₇₆N₂₆O₄₄Na₁₆-10g stirring homogeneously and finally adding the dendritic polyamidoamine C₄₆H₇₂N₁₀O₂₀Na₈20g of the mixture is stirred uniformly.

Example 3: adding 53g of ethylene glycol into a beaker, adding 19g of stearic acid amide propyl dimethyl alkyl quaternary ammonium salt, uniformly stirring, adding 2g of sodium hydroxide, uniformly stirring, and adding dendritic polyamidoamine C₁₁₀H₁₇₆N₂₆O₄₄Na₁₆8g of polyanilide C are stirred homogeneously and finally the dendritic polyamidoamine C is added₄₆H₇₂N₁₀O₂₀Na₈-18g stirring homogeneously.

Example 4: adding 59g of ethylene glycol into a beaker, adding 17g of stearic acid amide propyl dimethyl alkyl quaternary ammonium salt, uniformly stirring, adding 2g of sodium hydroxide, uniformly stirring, and adding dendritic polyamidoamine C₁₁₀H₁₇₆N₂₆O₄₄Na₁₆6g of polyanilide C are stirred homogeneously and finally the dendritic polyamidoamine C is added₄₆H₇₂N₁₀O₂₀Na₈16g of the mixture is stirred uniformly.

Example 5: adding 63g of ethylene glycol into a beaker, adding 15g of stearic acid amide propyl dimethyl alkyl quaternary ammonium salt, uniformly stirring, adding 2g of sodium hydroxide, uniformly stirring, and adding dendritic polyamidoamine C₁₁₀H₁₇₆N₂₆O₄₄Na₁₆5g of polyanilide C are stirred homogeneously and finally the dendritic polyamidoamine C is added₄₆H₇₂N₁₀O₂₀Na₈-15g stirring well.

Example 6: adding 66g of ethylene glycol into a beaker, adding 13g of stearic acid amide propyl dimethyl alkyl quaternary ammonium salt, uniformly stirring, adding 1g of sodium hydroxide, uniformly stirring, and adding dendritic polyamidoamine C₁₁₀H₁₇₆N₂₆O₄₄Na₁₆5g of polyanilide C are stirred homogeneously and finally the dendritic polyamidoamine C is added₄₆H₇₂N₁₀O₂₀Na₈-15g stirring well.

The material adding and mixing process of the invention is not limited to the conventional method, and the dendritic polyamidoamine C can be firstly added₁₁₀H₁₇₆N₂₆O₄₄Na₁₆And dendritic polyamidoamine C₄₆H₇₂N₁₀O₂₀Na₈Pre-mixing uniformly, adding into the mixture obtained in step 3 of the method, and stirring at the stirring speed of 2000-5000r/min for 40-60 minutes at normal temperature to uniformly mix the mixture to obtain the product of the invention. The demulsification effect of the obtained product is the same as that of the conventional method.

The resulting demulsifiers were tested for their performance as follows.

1. Preparing a certain amount of saline water according to the mass ratio of NaCl to water of 20 to 100;

2. taking on-site crude oil, and mixing the following raw oil in percentage by mass: pouring crude oil and brine into a container at a ratio of 30:70, preheating at 70 ℃ for 30min, and stirring with a high-speed stirrer for 20min to obtain emulsified oil with salt content of 140 g/L;

3. 50mL of emulsified oil is poured into a measuring cylinder with a plug, preheated for 10min at the temperature of 85 ℃/90 ℃, and added with 200mg/L of the demulsifier. And starting timing and recording the water outlet condition.

The effects are as follows:

finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; those skilled in the art will appreciate that combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments, which are subject to only obvious modifications and alterations of the technical idea of the present application, all falling within the scope of the present invention.