CN112195022A - Foaming agent for carbon dioxide foam fracturing system and preparation method and application thereof - Google Patents
Foaming agent for carbon dioxide foam fracturing system and preparation method and application thereof Download PDFInfo
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- CN112195022A CN112195022A CN202011154350.5A CN202011154350A CN112195022A CN 112195022 A CN112195022 A CN 112195022A CN 202011154350 A CN202011154350 A CN 202011154350A CN 112195022 A CN112195022 A CN 112195022A
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- foaming agent
- carbon dioxide
- fracturing system
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- dioxide foam
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/70—Compositions for forming crevices or fractures characterised by their form or by the form of their components, e.g. foams
- C09K8/703—Foams
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/602—Compositions for stimulating production by acting on the underground formation containing surfactants
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
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- Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
Abstract
The invention discloses a foaming agent for a carbon dioxide foam fracturing system, which comprises the following raw materials in percentage by weight of 100 percent: 38-42% of zwitterionic surfactant, 5-8% of C12-18 nonionic surfactant, 0.05-0.2% of high molecular compound, 5-10% of solvent and the balance of water; wherein the zwitterionic surfactant is any one of didodecyl methyl carboxyl betaine, adamantyl betaine, dicarboxyl betaine and polyoxyethylenated carboxyl betaine. Meanwhile, the invention also discloses a preparation method and application of the foaming agent. The foaming agent has good temperature resistance, acid resistance and salt resistance, and is suitable for being used in a carbon dioxide foam fracturing system.
Description
Technical Field
The invention belongs to the technical field of oil and gas field exploitation, and particularly relates to a foaming agent for a carbon dioxide foam fracturing system, and a preparation method and application thereof.
Background
The foam fracturing fluid is a gas-in-liquid emulsion and is a uniform dispersion of a large amount of gas in a small amount of liquid. The foam fracturing fluid at home and abroad develops through the following four stages: first-generation foamed fracturing fluid: water and foaming agent are easy to flow back after being pressed, and the fracturing fluid can be used for fracturing of a low-pressure gas well; second-generation foam fracturing fluid: water, a foaming agent and a polymer have high viscosity and high stability, and are suitable for fracturing of high-pressure oil and gas reservoirs; third-generation foam fracturing fluid: the viscosity and the stability are further improved, the crack forming and sand carrying capabilities are enhanced, and the fracturing fluid is suitable for large-scale hydraulic fracturing of a high-temperature deep well; fourth-generation foam fracturing fluid: the internal phase is constant, the volume of the internal phase is controlled, the construction friction resistance is reduced, and the requirement of large-scale fracturing construction can be met.
With the extensive development of the deldos basin to extend the gas field, the number of gas well fractured wells is increasing, the fracturing scale is increasing, and CO is2The foam fracturing fluid is a high-quality low-damage fracturing fluid system, has the characteristics of high viscosity, strong sand carrying and suspending capacity, low filtration loss, small friction, clean fracturing cracks, small damage to a reservoir stratum, easiness in flowback, high fracturing fluid efficiency and the like, and is particularly suitable for prolonging the fracturing transformation of the low-pressure, low-permeability and water-sensitive reservoir stratum of a gas field. The blowing agent is influencing CO2One of the main factors in the performance of foam fracturing fluids. Therefore, the quality of the foaming agent not only affects the formation and properties of the foam, but also plays a crucial role in the success of fracturing.
At present, water-based fracturing fluid is generally adopted for fracturing modification of gas wells, but most of the water-based fracturing fluid cannot meet the fracturing requirement of low-pressure water-sensitive oil and gas reservoirs. Thus, more and more gas wells are using CO2The foam fracturing fluid is used for modifying low-pressure water-sensitive oil and gas reservoirs. CO 22The quality of foam of the foam fracturing fluid depends on the foaming performance and foam stabilizing capability of the foaming agent. Most foaming agents adopted in conventional fracturing are anionic surfactant systems or cationic surfactant systems, the foaming agents of the anionic surfactant systems are incompatible with fracturing fluid with high salinity and formation water, and the foam stabilizers of the cationic surfactant systems are seriously absorbed by sandstone formation rocks, so that the foam stabilizing effect of the foam fracturing fluid is influenced. And the foaming agent adopted by the conventional fracturing has poor acid resistance and temperature resistance, does not have biodegradability, and is not suitable for carrying out acid CO on medium-high temperature gas well reservoirs2And (4) fracturing the foam.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a foaming agent for a carbon dioxide foam fracturing system, a preparation method and an application thereof, wherein the foaming agent has strong salt resistance, foam stability, temperature resistance and acid resistance, and can meet the requirements of CO gas wells2The need for foam fracturing.
A foaming agent for a carbon dioxide foam fracturing system comprises the following raw materials in percentage by weight of 100 percent: 38-42% of zwitterionic surfactant, 5-8% of C12-18 nonionic surfactant, 0.05-0.2% of macromolecular compound, 5-10% of solvent and the balance of water;
wherein the zwitterionic surfactant is any one of didodecyl methyl carboxyl betaine, adamantyl betaine, dicarboxyl betaine and polyoxyethylenated carboxyl betaine.
Preferably, the C12-18 nonionic surfactant is any one of branched alcohol polyoxyethylene ether, N-dodecyl-N-methyl glucamide and fluorocarbon lauryl alcohol polyoxyethylene ether sodium ethylene glycol monoester sulfonate.
Preferably, the C12-18 nonionic surfactant is sodium fluorocarbon laureth mono-ester ethanesulfonate. The fluorocarbon lauryl polyoxyethylene ether sodium ethylene glycol monoester sulfonate is prepared by adopting fluorocarbon lauryl polyoxyethylene ether sodium ethylene glycol monoester sulfonate in the prior art.
Preferably, the polymer compound is any one of welan gum, xanthan gum and hydroxyethyl cellulose.
Preferably, the solvent is a small molecule alcohol.
Preferably, the small molecule alcohol is ethanol or isopropanol.
The preparation method of the foaming agent for the carbon dioxide foam fracturing system comprises the following steps: the raw materials are mixed and stirred.
The application is that the foaming agent is added into a carbon dioxide foam fracturing system according to the mass concentration of 0.3-0.5%.
The invention has the advantages that:
(1) the foaming agent provided by the invention has high foaming height at normal temperature and long half-life period, and is stirred for 1min at a rotating speed of 8000r/min when the concentration of the foaming agent is 0.5% at 25 ℃ by adopting a Waring Blender method, so that the measured foaming height of the foaming agent can reach 510mL, and the longest half-life period can reach 12 min;
(2) the foaming agent has strong temperature resistance, and the foaming height and half-life period of the foaming agent are not changed greatly within the range of 25-80 ℃;
(3) the foaming agent has good divalent salt resistance, and the foaming agent solution has no precipitation and delamination in the salt solution at normal temperature and has good foaming performance in the salt solution;
(4) the foaming agent has strong acid resistance, and the foaming agent solution does not precipitate or delaminate in an acid solution at normal temperature;
(5) is easy to be biodegraded.
Detailed Description
In the embodiment of the invention, the fluorocarbon lauryl alcohol polyoxyethylene ether sodium ethylene glycol monoester sulfonate is purchased from Shanghai Yicong New Material science and technology company Limited.
Example 1
A foaming agent for a carbon dioxide foam fracturing system comprises the following raw materials in percentage by weight of 100 percent: 38% of polyoxyethylene carboxyl betaine, 5% of fluorocarbon lauryl polyoxyethylene ether sodium ethylene glycol monoester sulfonate, 0.05% of welan gum, 5% of ethanol and the balance of water.
The raw materials are mixed and stirred uniformly to obtain the product.
Example 2
A foaming agent for a carbon dioxide foam fracturing system comprises the following raw materials in percentage by weight of 100 percent: 40% of polyoxyethylene carboxyl betaine, 6% of fluorocarbon lauryl polyoxyethylene ether sodium ethylene glycol monoester sulfonate, 0.1% of welan gum, 5% of ethanol and the balance of water.
The raw materials are mixed and stirred uniformly to obtain the product.
Example 3
A foaming agent for a carbon dioxide foam fracturing system comprises the following raw materials in percentage by weight of 100 percent: 42% of polyoxyethylene carboxyl betaine, 8% of fluorocarbon lauryl polyoxyethylene ether sodium ethylene glycol monoester sulfonate, 0.05% of welan gum, 7.5% of ethanol and the balance of water.
The raw materials are mixed and stirred uniformly to obtain the product.
Example 4
A foaming agent for a carbon dioxide foam fracturing system comprises the following raw materials in percentage by weight of 100 percent: 38% of polyoxyethylene carboxyl betaine, 5% of fluorocarbon lauryl polyoxyethylene ether sodium ethylene glycol monoester sulfonate, 0.05% of welan gum, 7.5% of ethanol and the balance of water.
The raw materials are mixed and stirred uniformly to obtain the product.
Example 5
A foaming agent for a carbon dioxide foam fracturing system comprises the following raw materials in percentage by weight of 100 percent: 38% of polyoxyethylene carboxyl betaine, 8% of fluorocarbon lauryl polyoxyethylene ether sodium ethylene glycol monoester sulfonate, 0.1% of welan gum, 7.5% of ethanol and the balance of water.
The raw materials are mixed and stirred uniformly to obtain the product.
Example 6
A foaming agent for a carbon dioxide foam fracturing system comprises the following raw materials in percentage by weight of 100 percent: 42% of polyoxyethylene carboxyl betaine, 8% of fluorocarbon lauryl polyoxyethylene ether sodium ethylene glycol monoester sulfonate, 0.1% of welan gum, 10% of ethanol and the balance of water.
The raw materials are mixed and stirred uniformly to obtain the product.
Example 7
A foaming agent for a carbon dioxide foam fracturing system comprises the following raw materials in percentage by weight of 100 percent: 40% of didodecyl methyl carboxyl betaine, 8% of fluorocarbon lauryl polyoxyethylene ether sodium ethylene glycol mono-ester sulfonate, 0.2% of xanthan gum, 10% of isopropanol and the balance of water.
The raw materials are mixed and stirred uniformly to obtain the product.
Example 8
A foaming agent for a carbon dioxide foam fracturing system comprises the following raw materials in percentage by weight of 100 percent: 40% of adamantyl betaine, 8% of fluorocarbon lauryl alcohol polyoxyethylene ether sodium ethylene glycol mono-ester sulfonate, 0.05% of hydroxyethyl cellulose, 8% of ethanol and the balance of water.
The raw materials are mixed and stirred uniformly to obtain the product.
Example 9
A foaming agent for a carbon dioxide foam fracturing system comprises the following raw materials in percentage by weight of 100 percent: 40% of dicarboxyl betaine, 8% of fluorocarbon lauryl alcohol polyoxyethylene ether sodium ethylene glycol mono-ester sulfonate, 0.05% of welan gum, 8% of ethanol and the balance of water.
The raw materials are mixed and stirred uniformly to obtain the product.
Example 10
A foaming agent for a carbon dioxide foam fracturing system comprises the following raw materials in percentage by weight of 100 percent: 42% of polyoxyethylated carboxyl betaine, 8% of N-dodecyl-N-methyl glucamide, 0.1% of welan gum, 10% of ethanol and the balance of water.
The raw materials are mixed and stirred uniformly to obtain the product.
Example 11
A foaming agent for a carbon dioxide foam fracturing system comprises the following raw materials in percentage by weight of 100 percent: 42% of polyoxyethylene carboxyl betaine, 8% of lauryl alcohol polyoxyethylene ether, 0.1% of welan gum, 10% of ethanol and the balance of water.
The raw materials are mixed and stirred uniformly to obtain the product.
Comparative example 1
The zwitterionic surfactant was replaced with cetyl dimethyl betaine, otherwise as in example 6, as follows:
the foaming agent comprises the following raw materials in percentage by weight of 100 percent: 42% of hexadecyl dimethyl betaine, 8% of fluorocarbon lauryl polyoxyethylene ether sodium ethylene glycol mono-ester sulfonate, 0.1% of welan gum, 10% of ethanol and the balance of water.
Comparative example 2
The nonionic surfactant was replaced with cocodiethanolamide, otherwise as in example 6, as follows:
the foaming agent comprises the following raw materials in percentage by weight of 100 percent: 42% of polyoxyethylated carboxyl betaine, 8% of coconut diethanolamide, 0.1% of welan gum, 10% of ethanol and the balance of water.
Comparative example 3
The same procedure as in example 6, except that the zwitterionic surfactant was replaced with cetyl dimethyl betaine and the nonionic surfactant was replaced with cocodiethanolamide, was followed:
the foaming agent comprises the following raw materials in percentage by weight of 100 percent: 42% of hexadecyl dimethyl betaine, 8% of coconut diethanolamide, 0.1% of welan gum, 10% of ethanol and the balance of water.
Performance detection
Temperature resistance detection
Preparing an aqueous solution of the foaming agent prepared in the embodiment of the invention and the comparative example according to the mass concentration of 0.5%, stirring for 1min at the rotating speed of 8000r/min to prepare foam, and detecting the influence of different temperatures on the foam.
TABLE 1 Effect of temperature on foaming Properties
As can be seen from Table 1, the foaming agent of the invention is prepared at a concentration of 0.5% within a temperature range of 25-80 ℃, the foam height and half-life period are not obviously changed at 25-80 ℃, the temperature resistance is strong, and the foaming agent liquid is clear.
Secondly, acid resistance detection
The acid resistance test was performed at 25 ℃ at room temperature with the foaming agent added at 0.5% by mass to various concentrations of hydrochloric acid solution and the solution was observed for clarity, floc or precipitate formation, as shown in Table 2.
TABLE 2 foaming agent acid resistance test results
As can be seen from Table 2, the foamer solution provided by the present invention is clear in acid solution and does not have any precipitation and floc generation, indicating that the foamer system has good acid resistance.
Salt resistance
Under the condition of normal temperature of 25 ℃, adding the foaming agent provided by the invention into long 2 layers of formation water and tap water respectively according to the mass measurement of 0.5%, wherein the total mineralization degree of the long 2 layers of formation water is 100000mg/L, the calcium ion content is 10000mg/L, standing for 24h and observing the phenomenon; meanwhile, the mixture is stirred for 1min at the rotating speed of 8000r/min to prepare foam, and the foaming height and half-life period of the foam are detected, and the result is shown in a table 3.
TABLE 3 foamer compatibility test
As can be seen from Table 3, the frother provided by the present invention still has good foaming properties in hypersaline water, and the frother solution is clear and does not have any precipitation and floc generation during standing, indicating that the frother system has good compatibility with formation water.
In conclusion, the foaming agent provided by the invention has better temperature resistance, acid resistance and salt resistance, and is suitable for being used in a carbon dioxide foam fracturing system.
Claims (8)
1. A foaming agent for a carbon dioxide foam fracturing system is characterized in that: the composite material comprises the following raw materials in percentage by weight of 100 percent: 38-42% of zwitterionic surfactant, 5-8% of C12-18 nonionic surfactant, 0.05-0.2% of macromolecular compound, 5-10% of solvent and the balance of water;
wherein the zwitterionic surfactant is any one of didodecyl methyl carboxyl betaine, adamantyl betaine, dicarboxyl betaine and polyoxyethylenated carboxyl betaine.
2. The carbon dioxide foam fracturing system foaming agent of claim 1, wherein: the C12-18 nonionic surfactant is any one of branched alcohol polyoxyethylene ether, N-dodecyl-N-methyl glucamide and fluorocarbon lauryl alcohol polyoxyethylene ether sodium ethylene glycol monoester sulfonate.
3. The carbon dioxide foam fracturing system foaming agent of claim 2, wherein: the nonionic surfactant of C12-18 is sodium fluorocarbon lauryl polyoxyethylene ether monoester sulfonate.
4. The carbon dioxide foam fracturing system foaming agent of claim 3, wherein: the high molecular compound is any one of welan gum, xanthan gum and hydroxyethyl cellulose.
5. The carbon dioxide foam fracturing system foaming agent of claim 4, wherein: the solvent is a small molecular alcohol.
6. The foaming agent for a carbon dioxide foam fracturing system as claimed in claim 5, wherein: the small molecular alcohol is ethanol or isopropanol.
7. A method for preparing a foaming agent for a carbon dioxide foam fracturing system as claimed in any one of claims 1 to 6, wherein: the method comprises the following steps: the raw materials are mixed and stirred.
8. Use of a foaming agent for a carbon dioxide foam fracturing system as claimed in any one of claims 1 to 6, wherein: the application is that the foaming agent is added into a carbon dioxide foam fracturing system according to the mass concentration of 0.3-0.5%.
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| CN202011154350.5A CN112195022B (en) | 2020-10-26 | 2020-10-26 | Foaming agent for carbon dioxide foam fracturing system and preparation method and application thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113684015A (en) * | 2021-08-25 | 2021-11-23 | 西南石油大学 | High-temperature-resistant high-salt self-generated foam fracturing fluid and preparation method thereof |
| CN114854389A (en) * | 2022-07-06 | 2022-08-05 | 德仕能源科技集团股份有限公司 | Foaming agent and preparation method and application thereof |
| CN115746820A (en) * | 2022-11-04 | 2023-03-07 | 泰坦(天津)能源技术有限公司 | High-temperature-resistant carbon dioxide foam fracturing fluid and preparation method and application thereof |
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| CN115746820A (en) * | 2022-11-04 | 2023-03-07 | 泰坦(天津)能源技术有限公司 | High-temperature-resistant carbon dioxide foam fracturing fluid and preparation method and application thereof |
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|---|---|
| CN112195022B (en) | 2022-12-02 |
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