CN110669487B

CN110669487B - Fluidity control agent and preparation method thereof

Info

Publication number: CN110669487B
Application number: CN201910965518.1A
Authority: CN
Inventors: 邵世壮; 孙安顺
Original assignee: Daqing Huaying Chemical Co ltd
Current assignee: Daqing Huaying Chemical Co ltd
Priority date: 2019-10-11
Filing date: 2019-10-11
Publication date: 2021-07-23
Anticipated expiration: 2039-10-11
Also published as: CN110669487A

Abstract

The invention relates to a fluidity control agent and a preparation method thereof, which relate to the technical field of oil exploitation, and the fluidity control agent is prepared by adding 20-30 parts of butenoic acid, 6-15 parts of diethylenone and 3-8 parts of propyl crotonate into 70-90 parts of water, uniformly stirring, heating to 60-80 ℃, adding 3-5 parts of azoisobutyric acid dinitrile, stirring, keeping the temperature for 6-12 hours, stopping heating, stirring and cooling to room temperature. The fluidity control agent prepared by the method can obviously improve the shearing resistance of the polymer, maintain the original viscosity and improve the rheological property, thereby achieving the aim of fluidity control, the fluidity control agent can maintain the high viscosity of the polymer fluid, improve the salt resistance and the temperature resistance of the polymer, and overcome the defects of poor shearing resistance, poor temperature resistance and poor rheological property of the existing polymer. When in use, the polymer additive is only added into the polymer preparation solution, and the addition amount is only 0.01-0.1%.

Description

Fluidity control agent and preparation method thereof

The technical field is as follows:

the invention relates to the technical field of oil exploitation, in particular to a fluidity control agent and a preparation method thereof.

Background art:

with the continuous deepening of the exploration and development of petroleum and natural gas and the continuous increase of the demand of oil and gas resources, medium and low permeability oil reservoirs become one of the main sources of oil and gas resources in China gradually. In the reservoir reserves already explored in China, the medium-low permeability geological reservoir reserves account for more than 1/3 of the geological reserves of the explored oil and gas resources.

At present, the domestic chemical flooding enhanced recovery rate mainly takes polymer flooding as main material. Conventional polymers such as partially hydrolyzed acrylamide (HPAM), xanthan gum and the like are mainly developed aiming at improving the recovery ratio of a high-permeability oil reservoir, cannot well meet the displacement requirement of a medium-low permeability oil reservoir, and seriously restrict the exploration and development of medium-low permeability oil and gas resources.

Since conventional polymers do not have the ability to resist mechanical shear degradation, they are poor in salt resistance and long-term stability. Due to the structural characteristics, the original viscoelasticity is gradually lost along with the increase of the mineralization degree; the structure can release the fracture of limbs in the shearing process of the porous medium, the molecular weight of the whole molecule can be greatly changed, and a strong network structure can not be formed, so that the fluidity control effect is lost.

The invention content is as follows:

in view of the above-mentioned disadvantages of the prior art, the present invention provides a fluidity controlling agent. The prepared fluidity control agent can obviously improve the shearing resistance of the polymer, keep the original viscosity, improve the rheological property and achieve the aim of fluidity control.

The fluidity control agent is prepared by mixing the following components in parts by weight: water: 70-90 parts of butenoic acid: 20-30 parts of diethyl ketene: 6-15 parts of propyl crotonate: 3-8 parts of azoisobutyric acid dinitrile: 3-5 parts.

The method for preparing the fluidity control agent comprises the following specific operations: adding 20-30 parts of butenoic acid, 6-15 parts of diethylenone and 3-8 parts of propyl crotonate into 70-90 parts of water, uniformly stirring, heating to 60-80 ℃, adding 3-5 parts of azoisobutyric acid dinitrile, stirring, keeping the temperature for 6-12 hours, stopping heating, stirring, and cooling to room temperature to obtain the fluidity control agent.

The fluidity control agent prepared by the method can obviously improve the shearing resistance of the polymer, maintain the original viscosity and improve the rheological property, thereby achieving the aim of fluidity control, the fluidity control agent can maintain the high viscosity of the polymer fluid, improve the salt resistance and the temperature resistance of the polymer, and overcome the defects of poor shearing resistance, poor temperature resistance and poor rheological property of the existing polymer. When in use, the polymer additive is only added into the polymer preparation solution, and the addition amount is only 0.01-0.1%.

The specific implementation mode is as follows:

the present invention will be described in detail with reference to the following specific examples, wherein the substances in the present invention are all calculated by mass parts.

Example 1

A fluidity control agent is prepared by mixing the following components in parts by weight: water: 70 parts of butenoic acid: 20 parts of diethyl ketene: 6 parts, propyl crotonate: 3 parts of azoisobutyric acid dinitrile: and 3 parts.

Example 2

A fluidity control agent is prepared by mixing the following components in parts by weight: water: 80 parts of butenoic acid: 25 parts of diethyl ketene: 10 parts, propyl crotonate: 6 parts of azoisobutyric acid dinitrile: 4 parts.

Example 3

A fluidity control agent is prepared by mixing the following components in parts by weight: water: 90 parts of butenoic acid: 30 parts of diethyl ketene: 15 parts, propyl crotonate: 8 parts of azoisobutyric acid dinitrile: 5 parts of the raw materials.

Example 4

The preparation method of the fluidity control agent comprises the following steps: adding 70 parts of water into a reaction kettle, starting stirring, continuously adding 20 parts of butenoic acid, 6 parts of diethylenone and 3 parts of propyl crotonate, uniformly stirring, heating to 60 ℃, adding 3 parts of azoisobutyric acid dinitrile, stirring and keeping the temperature for 6 hours, stopping heating and stirring, and cooling to room temperature to obtain a fluidity control agent; the above are all parts by mass.

Example 5

The preparation method of the fluidity control agent comprises the following steps: adding 80 parts of water into a reaction kettle, starting stirring, continuously adding 25 parts of butenoic acid, 10 parts of diethylenone and 6 parts of propyl crotonate, uniformly stirring, heating to 70 ℃, adding 4 parts of azoisobutyric acid dinitrile, stirring, keeping the temperature for 9 hours, stopping heating, stirring and cooling to room temperature to obtain a fluidity control agent; the above are all parts by mass.

Example 6

The preparation method of the fluidity control agent comprises the following steps: adding 90 parts of water into a reaction kettle, starting stirring, continuously adding 30 parts of butenoic acid, 15 parts of diethylenone and 8 parts of propyl crotonate, uniformly stirring, heating to 80 ℃, adding 5 parts of azoisobutyric acid dinitrile, stirring, keeping the temperature for 12 hours, stopping heating, stirring and cooling to room temperature to obtain a fluidity control agent; the above are all parts by mass.

Performance experiments:

1. determination of temperature-resistant anti-aging viscosity retention rate and anti-shearing viscosity retention rate

(1) Adding 1000mL of experimental medium (1% and 5% sodium chloride solution respectively) into a 2000mL beaker, placing the beaker on a blender, starting the blender to stir at a low speed, and slowly adding 1.5g of polyacrylamide dry powder (accurate to 0.001 g); after being stirred uniformly, standing for 2 hours at room temperature to obtain a polyacrylamide solution;

(2) adding 1000mL of the test solution in the process of (1) into a 2000mL beaker, placing the beaker on a mixer, starting the mixer to stir at a low speed, adding 0.2mL of the sample in the embodiment into the solution, continuing stirring for 30min and slowly adding 1.5g of polyacrylamide dry powder (accurate to 0.001 g); after being stirred uniformly, standing for 2 hours at room temperature to obtain a polyacrylamide solution;

(3) measuring 4 parts of the polymer solution with the measured viscosity in the step (2) to 200mL, placing one part of the polymer solution in a closed container, and placing the closed container in a constant-temperature drying oven at 45 ℃ for 7 d; putting one part of the extract into a closed container, and putting the closed container into a constant-temperature drying oven at 60 ℃ for 7 d; putting one part of the extract into a closed container, and putting the closed container into a constant-temperature drying oven at 90 ℃ for 7 d; placing the other part in a stirring cup of a high-speed stirrer, quickly shearing for 30min under the condition of 8000r/min, and standing for 30 min; the viscosity of the solution was measured with a Brookfield viscometer.

TABLE 1 viscosity Retention on by aging for 7 days at different temperatures

As can be seen from the data in Table 1, for the polymer with the molecular weight of 1600-1800 ten thousand, the viscosity retention rate is lower than 32 percent in saline systems with different concentrations at different temperatures, and the temperature resistance and the salt resistance are poor; after the embodiment of the invention is added, the viscosity retention rate is higher than 90%, and the temperature resistance and salt resistance of the polymer system are better, which shows that the embodiment of the invention enhances the temperature resistance and salt resistance of the polymer system and has better rheological property.

As can be seen from the data in Table 1, for the polymer with the molecular weight of 2500 ten thousand, the viscosity retention rate of the polymer is lower than 36 percent in saline water systems with different concentrations at different temperatures, and the polymer has poor temperature resistance and salt resistance; after the polymer system is added, the viscosity retention rate is higher than 90%, and the temperature resistance and salt resistance of the polymer system are better, which shows that the polymer system has enhanced temperature resistance and salt resistance.

TABLE 2 viscosity Retention after 30min shearing at 8000r/min

As can be seen from the data in Table 2, for a polymer with a molecular weight of 1600-1800 ten thousand, the viscosity retention is less than 50% when sheared at 8000 r/min; for a polymer with the molecular weight of 2500 ten thousand, the polymer is sheared under the condition of 8000r/min, the viscosity retention rate is lower than 58 percent, and the anti-shearing capability is poor; after the embodiment of the invention is added, the viscosity retention rate is higher than 97%, and the shear resistance is stronger, which shows that the embodiment of the invention enhances the shear resistance of a polymer system and has better rheological property.

Claims

1. The fluidity control agent is characterized by being prepared by mixing the following components in parts by weight: water: 70-90 parts of butenoic acid: 20-30 parts of diethyl ketene: 6-15 parts of propyl crotonate: 3-8 parts of azoisobutyric acid dinitrile: 3-5 parts;