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A kind of nanocomposite oil displacement agent and its preparation method and application

A technology of nano-composite and oil-displacing agent, which is applied in chemical instruments and methods, drilling compositions, heat-exchange materials, etc., can solve the problem of increasing oil production workload, oil production raw materials and time costs, increase in interfacial tension, performance It can improve the displacement efficiency, reduce the interfacial tension, and reduce the cost of oil production.

Active Publication Date: 2020-05-08
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the use of surfactants and polymer surfactants used as oil displacement agents at this stage, a large amount of loss often occurs, resulting in a significant increase in interfacial tension and a decline in performance. Therefore, it is often necessary to increase the working time of oil recovery , Repeated oil displacement and other methods to ensure high production rate, but at the same time increase the workload of oil recovery and the cost of oil recovery raw materials and time

Method used

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  • A kind of nanocomposite oil displacement agent and its preparation method and application
  • A kind of nanocomposite oil displacement agent and its preparation method and application
  • A kind of nanocomposite oil displacement agent and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0057] The present embodiment provides a kind of nanocomposite oil displacement agent, and its preparation method is as follows:

[0058] 1. Preparation of inorganic nano intermediates

[0059] a. Using co-precipitation method, mix montmorillonite and water in a 1 cubic meter multifunctional reaction kettle at a mass ratio of 1:15, and swell for 20 to 30 minutes at a stirring rate of 30 to 35 Hz to obtain a swelling system ;

[0060] b. Heat up the swelling system obtained above to 80°C, then add an intercalation agent cetyl ammonium bromide equivalent to 10% of the mass of the swelling system into the multifunctional reactor, set the mixer frequency to 30hz, and react for 12h;

[0061] c. Pour the reaction product obtained above into a cooling tank, wait for the temperature to drop to 30°C, and perform vacuum filtration;

[0062] d. The solid powder obtained by suction filtration was placed in a drying oven and dried at 65° C. to obtain an inorganic nano-intermediate, which...

Embodiment 2

[0077] Example 2 provides a nanocomposite oil displacement agent, the preparation process of which is basically the same as that of Example 1, the only difference being that in step 3-b, the added mass of the inorganic nano-intermediate is controlled to be 2% of the total mass of the mixed solution.

[0078] After testing, when the nanocomposite oil displacement agent product is dispersed in water, more than 95% (volume fraction) of the particle size distribution is within the range of 100-120nm.

Embodiment 3

[0080] Example 3 provides a nanocomposite oil displacement agent, the preparation process of which is basically the same as that of Example 1, the only difference being that in step 3-c, the added mass of inorganic nano intermediates is controlled to be 3% of the total mass of the mixed solution.

[0081] After testing, when the nanocomposite oil displacement agent product is dispersed in water, more than 95% (volume fraction) of the particle size distribution is within the range of 100-120nm.

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Abstract

The invention provides a nanometer composite oil displacement agent, and a preparation method and application thereof. The preparation method comprises the following specific steps: mixing acrylamide,sodium p-styrenesulfonate and water according to a mass ratio of (10.5-13.5): (4.5-5): (90-99) so as to obtain a mixed solution; adding a surfactant accounting for 5 to 7% by weight of the mixed solution into the mixed solution, then adjusting the pH value of the mixed solution to 7 to 7.5, and then adding an inorganic nanometer intermediate accounting for 1 to 3% by mass of the mixed solution into the mixed solution so as to obtain a reaction solution; adding an initiator into the reaction solution in an inert atmosphere, and carrying out a reaction at 75 to 80 DEG C for 8 to 10 h to obtaina polymer emulsion; and subjecting the polymer emulsion to demulsification, drying and crushing to obtain the nanometer composite oil displacement agent. The nanometer composite oil displacement agentprovided by the invention has the characteristics of good temperature resistance, good salt resistance and capacity of reducing oil-water interfacial tension, and can be used for oil production engineering of high-permeability, medium-permeability and low-permeability oil and gas reservoirs and later residual oil reservoirs of tertiary oil recovery.

Description

technical field [0001] The invention relates to a nanocomposite oil displacement agent and its preparation method and application, belonging to the technical field of oil and gas field exploitation. Background technique [0002] Petroleum is a non-renewable resource. With the increase of mining volume, its reserves continue to decrease, and its new reserves are mainly in complex reservoirs such as unconventional deep layers. Due to the increasing difficulty of mining, the mining technologies required, especially oil displacement agents, etc. Materials have become a key factor in improving the efficiency of oil and gas extraction. [0003] Conventional oil extraction includes primary oil recovery and secondary oil recovery processes. The primary oil recovery process is to use the pressure of the oilfield itself to make the oil spray out, and 20% of the original geological reserves can be recovered. With the reduction of formation pressure or energy, the output of primary oi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F212/14C08F226/06C08F2/44C09K5/06
CPCC08F2/44C08F220/56C09K8/584C09K8/604C09K8/882C09K2208/10C08F212/14C08F226/06
Inventor 柯扬船邓青春
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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