A kind of heat-resistant foam gel and its preparation method and application

Abstract

The invention discloses a temperature-resistant foam gel as well as a preparation method and application thereof. The temperature-resistant foam gel comprises the following components in percentage bymass: 0.3% of a polymer; 0.15%-0.35% of a cross-linking agent; 0.05%-0.15% of a foaming agent; and the balance water; the cross-linking agent is a cross-linking agent A or a mixture of the cross-linking agent A and a cross-linking agent B, and the cross-linking agent A is resorcinol; and the cross-linking agent B is formaldehyde. It is found by observing microstructures of water-based foam, polymer solution foam and the foam gel by using a microscope and a scanning electron microscope that common foam and polymer cannot keep stable for a long time due to flowing of a liquid film at normal temperature, and the liquid film of the foam gel forms a reticular gel structure, so that the viscosity and strength of the liquid film are enhanced, the flowing of the liquid film is hindered, and the foam gel has better stability at high temperature. It is shown by low-permeability fracture type rock core plugging experiment, the foam gel system can form effective plugging in rock cores, has a goodgas breakthrough inhibition effect, and has a wide application prospect in low-permeability oil reservoir.

Description

technical field

[0001] The invention relates to a temperature-resistant foam gel and its preparation method and application, and belongs to the technical field of optimizing gas flooding swept volume. Background technique

[0002] In recent years, the rapid development of my country's economy has improved the level of urbanization and accelerated the process of industrialization. Many high-tech industries such as refining, fine chemistry, aerospace and other modern industries require a large amount of petroleum as raw materials and energy for industrial production. Diesel oil, gasoline, asphalt, paraffin and other chemical products refined from petroleum are widely used in people's daily production. So, oil consumption has been growing and has remained high for many years. With the large-scale exploitation and development of oil fields, petroleum, as a non-renewable energy source, has gradually entered a period of decline, and the demand for new technologies for oil well p...

Examples

Embodiment 1

[0057] Embodiment 1, research on compatibility of gel system and foaming agent

[0058] Add different concentrations (0.1wt%, 0.2wt%, 0.3wt%, 0.4wt%, 0.5wt%) of sodium α-alkenyl sulfonate in the crosslinking agent A gel system and crosslinking agent B gel system (AOS), Cocamidopropyl Betaine (CAB-35), Sodium Dodecyl Sulfate (SDS), Sodium Dodecyl Sulfonate (SLS), Sodium Dodecylbenzene Sulfonate (SDBS), Explore the compatibility of the foaming agent with the cross-linking agent B gel system and the cross-linking agent A gel system, and use the GSC method to observe the gel system at 80°C and 10000mg / L NaCl salinity for 3 hours. The results are shown in Table 2.

[0059] It can be seen from Table 2 that with the increase of the amount of AOS, the gel strength of the cross-linking agent A gel system gradually decreased in 3 hours. When the amount of AOS was 0.1wt% and 0.2wt%, compared with the blank control, the AOS There is no obvious effect on the cross-linking agent A gel sys...

Embodiment 2

[0066] Embodiment 2, foaming agent temperature resistance evaluation

[0067] Prepare 100 mL of a foaming agent solution with a certain concentration and seal it in an oven at 100°C for 48 hours. Take it out and cool it to room temperature. Use a Waring-Blender stirrer at a speed of 6000r / min to stir for 120s to foam. The gas medium is air. The foaming ability and foam stabilizing ability of the foaming agent after high temperature treatment were measured, and compared with the performance of the foaming agent of the same concentration without high temperature treatment, in order to investigate the temperature resistance of the foaming agent. The foam comprehensive value changes of high temperature treated and untreated SDS, SDBS, CAB-35 are as follows: figure 1 shown.

[0068] Depend on figure 1 It can be seen that SDS has good foaming ability and foam stabilizing ability, and after heat treatment, the foam comprehensive value drops the most; the foaming ability and foam st...

Embodiment 3

[0069] Embodiment 3, determination of foaming agent foaming ability and foam stabilizing ability

[0070] The foaming and foam stabilizing properties of the foaming agent were judged by recording the half-life and foaming volume of the water-based foam. Under the conditions of 25°C and 10000mg / L NaCl salinity, the volume, half-life and foam comprehensive value of water-based foam are shown in Table 3, figure 2 shown. It can be seen that the liquid separation half-life of the water-based foam of the three foaming agents increases as the concentration of the foaming agent first increases, and when the critical concentration is reached, the growth slows down or decreases slightly. Among them, the critical concentration of CAB-35 is 0.4 wt%, the critical concentration of SDS is 0.3wt%, and the critical concentration of SDBS is 0.4wt%. Depend on figure 2 It can be seen that for water-based foams, the foam integration value of SDS keeps the highest as the concentration increase...

technical field

[0001] The invention relates to a temperature-resistant foam gel and its preparation method and application, and belongs to the technical field of optimizing gas flooding swept volume. Background technique

[0002] In recent years, the rapid development of my country's economy has improved the level of urbanization and accelerated the process of industrialization. Many high-tech industries such as refining, fine chemistry, aerospace and other modern industries require a large amount of petroleum as raw materials and energy for industrial production. Diesel oil, gasoline, asphalt, paraffin and other chemical products refined from petroleum are widely used in people's daily production. So, oil consumption has been growing and has remained high for many years. With the large-scale exploitation and development of oil fields, petroleum, as a non-renewable energy source, has gradually entered a period of decline, and the demand for new technologies for oil well p...

Examples

Embodiment 1

[0057] Embodiment 1, research on compatibility of gel system and foaming agent

[0058] Add different concentrations (0.1wt%, 0.2wt%, 0.3wt%, 0.4wt%, 0.5wt%) of sodium α-alkenyl sulfonate in the crosslinking agent A gel system and crosslinking agent B gel system (AOS), Cocamidopropyl Betaine (CAB-35), Sodium Dodecyl Sulfate (SDS), Sodium Dodecyl Sulfonate (SLS), Sodium Dodecylbenzene Sulfonate (SDBS), Explore the compatibility of the foaming agent with the cross-linking agent B gel system and the cross-linking agent A gel system, and use the GSC method to observe the gel system at 80°C and 10000mg / L NaCl salinity for 3 hours. The results are shown in Table 2.

[0059] It can be seen from Table 2 that with the increase of the amount of AOS, the gel strength of the cross-linking agent A gel system gradually decreased in 3 hours. When the amount of AOS was 0.1wt% and 0.2wt%, compared with the blank control, the AOS There is no obvious effect on the cross-linking agent A gel sys...

Embodiment 2

[0066] Embodiment 2, foaming agent temperature resistance evaluation

[0067] Prepare 100 mL of a foaming agent solution with a certain concentration and seal it in an oven at 100°C for 48 hours. Take it out and cool it to room temperature. Use a Waring-Blender stirrer at a speed of 6000r / min to stir for 120s to foam. The gas medium is air. The foaming ability and foam stabilizing ability of the foaming agent after high temperature treatment were measured, and compared with the performance of the foaming agent of the same concentration without high temperature treatment, in order to investigate the temperature resistance of the foaming agent. The foam comprehensive value changes of high temperature treated and untreated SDS, SDBS, CAB-35 are as follows: figure 1 shown.

[0068] Depend on figure 1 It can be seen that SDS has good foaming ability and foam stabilizing ability, and after heat treatment, the foam comprehensive value drops the most; the foaming ability and foam st...

Embodiment 3

[0069] Embodiment 3, determination of foaming agent foaming ability and foam stabilizing ability

[0070] The foaming and foam stabilizing properties of the foaming agent were judged by recording the half-life and foaming volume of the water-based foam. Under the conditions of 25°C and 10000mg / L NaCl salinity, the volume, half-life and foam comprehensive value of water-based foam are shown in Table 3, figure 2 shown. It can be seen that the liquid separation half-life of the water-based foam of the three foaming agents increases as the concentration of the foaming agent first increases, and when the critical concentration is reached, the growth slows down or decreases slightly. Among them, the critical concentration of CAB-35 is 0.4 wt%, the critical concentration of SDS is 0.3wt%, and the critical concentration of SDBS is 0.4wt%. Depend on figure 2 It can be seen that for water-based foams, the foam integration value of SDS keeps the highest as the concentration increase...

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