CN115873578A - Foaming agent composition for sensitive heavy oil reservoir and preparation method and application thereof - Google Patents
Foaming agent composition for sensitive heavy oil reservoir and preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a foaming agent composition for a sensitive heavy oil reservoir, which comprises the following components in parts by weight: 0.2-10 parts of fatty alcohol glucose gemini surfactant; 0.1-10 parts of quaternary ammonium salt cation component; 0.1-5 parts of betaine type zwitterionic surfactant; 75 to 99.6 portions of water. A preparation method of a foaming agent composition for a sensitive heavy oil reservoir comprises the following steps: uniformly mixing the fatty alcohol glucose gemini surfactant, the quaternary ammonium salt cationic component, the betaine type zwitter-ion surfactant and water according to the formula ratio to obtain the foaming agent composition for the sensitive heavy oil reservoir. The invention also discloses application of the foaming agent composition in the exploitation of sensitive heavy oil and heavy oil reservoirs. The foaming agent composition for the sensitive heavy oil reservoir has the advantages of quick foaming under the oil reservoir condition, high foam plugging strength, strong viscosity reduction and oil displacement capabilities, good anti-swelling effect and the like.
Description
Technical Field
The invention belongs to the field of heavy oil exploitation, and particularly relates to a foaming agent composition for a sensitive heavy oil reservoir, and a preparation method and application thereof.
Background
China has rich heavy oil resource reserves, sensitive heavy oil reservoirs are one of the main types, and the reserve accounts for 13.6 percent of the total unused reserve. Influenced by high viscosity and high condensation point of the thickened oil, and the underground crude oil is at least more than 50 percent after primary oil recovery and secondary oil recovery, and a tertiary oil recovery technology is urgently needed to improve the crude oil recovery rate.
Chemical flooding is an important method for improving the recovery ratio of crude oil, and tertiary oil recovery technologies such as alkali flooding, surfactant flooding, polymer flooding, microemulsion flooding, foam flooding, binary composite flooding and the like can improve the recovery ratio by 10-30% or even more. The foam flooding is more and more emphasized by people due to the unique seepage and oil displacement performance of the foam flooding. Foams have better access than polymers or gels and reduce the permeability of high permeability layers. The foam can selectively block a high-permeability zone, adjust a water absorption profile and effectively enlarge the sweep efficiency due to the higher apparent viscosity and the characteristics of large blocking, small blocking and no water blocking and oil blocking. In addition, the foaming agent is a surface active system and has an oil displacement effect, so that the recovery ratio can be effectively improved.
It is worth noting that clay mineral content of sensitive heavy oil reservoirs is high, wherein montmorillonite formed by the extremely fine-particle water-containing aluminosilicate is of a layered structure, interlayer acting force is mainly weak van der waals force, and water is easy to absorb and expand during the contact with water-based fluid. The prior foaming agent in China is mainly used for oil displacement and profile control when applied to mines, and is rarely endowed with clay stabilizing effect. Therefore, the sensitive heavy oil reservoir has serious clay expansion in the conventional foam flooding development process, clay migration is easy to occur, a stratum framework is damaged, sand production is caused, the reservoir permeability of crude oil is changed, the problems of low liquid yield and the like of a measure well are caused, and the sensitive damage is very difficult to eliminate. When the existing foaming agent and the clay stabilizer are used together, the compatibility problem exists, and the foaming and foam stabilizing effects are influenced. Therefore, conventional foam systems are difficult to apply to sensitive heavy oil reservoirs.
Chinese patent application CN201310682128.6 discloses a temperature-resistant salt-resistant low-interfacial-tension foam oil displacement agent and a preparation method thereof, the invention mainly improves the oil displacement efficiency in the aspect of reducing interfacial tension, but the foam oil displacement system is easy to damage a reservoir and is difficult to be used for sensitive heavy oil reservoirs.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems in the prior art, the invention discloses a foaming agent composition for a sensitive heavy oil reservoir, a preparation method and application thereof, which have the functions of oil displacement, profile control and clay stabilization. The foaming agent composition can quickly foam under the oil reservoir condition to form small and uniform foam; the foam plugging strength is high, and the resistance factor is more than 440; the viscosity reduction effect and the oil displacement efficiency are good, the viscosity reduction rate of common thick oil (the viscosity range of 50-10000 mPa.s of crude oil at 50 ℃) and extra thick oil (the viscosity range of 10000-50000 mPa.s of crude oil at 50 ℃) reaches more than 95%, and the oil displacement efficiency of an indoor object model is improved by more than 20%. Meanwhile, the clay stabilizer has a high anti-swelling effect, the anti-swelling rate at the oil reservoir temperature reaches over 82%, the requirement of sensitive heavy oil reservoir is met, and the clay stabilizing effect is achieved.
The technical scheme is as follows: a foaming agent composition for sensitive heavy oil reservoirs comprises the following components in parts by weight:
0.2-10 parts of fatty alcohol glucose gemini surfactant shown in the formula (1);
0.1-10 parts of quaternary ammonium salt cation component;
0.1-5 parts of betaine type zwitterionic surfactant;
75-99.6 parts of water, wherein:
the structural formula of the fatty alcohol glucose gemini surfactant is as follows:
wherein R is 1 Is a C8-C24 long-chain alkyl group, preferably a C12-C16 long-chain alkyl group;
the quaternary ammonium salt cation component is quaternary ammonium salt cation surfactant shown in formula (2) or quaternary ammonium salt cation polymer shown in formula (3);
the quaternary ammonium salt cationic surfactant has the following structural formula:
wherein R is 2 Is C8-C24 long-chain alkyl, preferably C12-C18 long-chain alkyl;
R 3 is benzyl or methyl;
x is Cl, br or OH;
the quaternary ammonium salt cationic polymer has the following structural formula:
wherein R is 4 Is a C1-C8 linear alkyl or branched alkyl, preferably C1-C3 linear alkyl;
R 5 is benzylA group or a methyl group;
m＝3000-80000；
n＝3000-182000。
the betaine type zwitterionic surfactant is alkyl betaine shown in a formula (4) or alkyl sulfobetaine shown in a formula (5);
the alkyl betaines have the following structural formula:
wherein R is 6 Is a C12-C24 long-chain alkyl group, preferably a C12-C18 long-chain alkyl group.
The alkyl sulfobetaines have the following structural formula:
wherein R is 7 Is C12-C24 long-chain alkyl, preferably C12-C18 long-chain alkyl;
R 8 is C2-C3 alkyl.
Furthermore, the viscosity average molecular weight of the quaternary ammonium salt cationic polymer is 300-5000 ten thousand.
Furthermore, the water is one of tap water, simulated formation water, formation water and seawater.
Further, the mass ratio of the fatty alcohol glucose gemini surfactant to the quaternary ammonium salt cation component is 0.5-20, preferably 1-5.
Further, the mass ratio of the fatty alcohol glucose gemini surfactant to the betaine type zwitterionic surfactant is 1-40, preferably 2-10.
A preparation method of a foaming agent composition for a sensitive heavy oil reservoir comprises the following steps:
uniformly mixing the fatty alcohol glucose gemini surfactant, the quaternary ammonium salt cationic component, the betaine type zwitterionic surfactant and water according to the formula ratio to obtain the foaming agent composition for the sensitive heavy oil reservoir.
The foaming agent composition is applied to the exploitation process of a sensitive heavy oil and heavy oil reservoir.
The fatty alcohol glucose gemini surfactant is a green environment-friendly foaming agent, has a gemini structure, can be more closely adsorbed on a gas-liquid interface than a single-chain structure, and has the characteristics of high surface activity, strong foaming capacity, no toxicity and green degradation. The quaternary ammonium salt cation component can act synergistically with the fatty alcohol glucose gemini surfactant, can improve electrostatic repulsion between interface layers, increases separation pressure, and has a good foam stabilizing effect. In addition, when the quaternary ammonium salt cation component meets clay, positively charged quaternary ammonium cations can form multi-point adsorption with clay particles to replace K on the surface of a clay crystal layer + 、Na + 、Ca 2 + When the metal cations are adsorbed to the clay, a layer of organic cation adsorption protection film is formed on the surface of the clay particles, and meanwhile, the clay particles are wrapped by the peripheral oleophylic long chains, so that the clay particles are prevented from being further corroded by the water phase, and long-acting anti-swelling is realized. The betaine type zwitterionic surfactant is a foam stabilizer, so that the interface charge density is greatly improved, the electrostatic repulsion between interface layers is enhanced, the separation pressure is increased, and the strength and the stability of foam are further improved. Meanwhile, the surfactant can be cooperated with the fatty alcohol glucose gemini surfactant to reduce the surface tension and the oil-water interfacial tension, and the emulsified crude oil capability and the oil displacement capability of the foam are improved.
Has the advantages that: compared with the prior art, the invention has the following beneficial effects:
(1) The foam composition can rapidly foam with CO under reservoir conditions 2 、N 2 One of a plurality of gases such as air, flue gas and the like forms uniform foam with small size, the foam has high plugging strength, and the resistance factor is more than 440;
(2) The foaming agent composition has higher interfacial activity and strong viscosity reduction and oil displacement capabilities, the viscosity reduction rate of common thick oil and extra thick oil reaches more than 95%, and the indoor physical model improves the oil displacement efficiency by more than 20%;
(3) The foaming agent composition has a high anti-swelling effect, the anti-swelling rate at the oil reservoir temperature reaches more than 82%, and the requirement of a sensitive heavy oil reservoir is met.
Drawings
FIG. 1 is a resistance factor curve of a nitrogen foam formed from the foaming agent composition Q1 for a sensitive heavy oil reservoir prepared in example 1.
The specific implementation mode is as follows:
the following describes in detail specific embodiments of the present invention.
Example 1
A foaming agent composition Q1 for sensitive heavy oil reservoirs comprises the following components in parts by mass:
the dodecanol glucose gemini surfactant has the following molecular formula:
a preparation method of a foaming agent composition Q1 for sensitive heavy oil reservoirs comprises the following steps: :
uniformly mixing the dodecanol glucose gemini surfactant, tetradecyl dimethyl benzyl ammonium bromide, dodecyl betaine and water according to the formula ratio to obtain a foaming agent composition Q1.
Example 2
A foaming agent composition Q2 for sensitive heavy oil reservoirs comprises the following components in parts by mass:
the molecular formula of the tetradecanol glucose gemini surfactant is as follows:
the total mineralization degree of the formation water is 16553mg/L, wherein Ca 2+ 、Mg 2+ The ion content was 765mg/L.
A preparation method of a foaming agent composition Q2 for sensitive heavy oil reservoirs comprises the following steps:
according to the mixture ratio, the tetradecanol glucose gemini surfactant, the tetradecyl trimethyl ammonium bromide, the 3-sulfopropyl tetradecyl dimethyl betaine and the formation water are uniformly mixed to obtain the foaming agent composition Q2.
Example 3
A foaming agent composition Q3 for sensitive heavy oil reservoirs comprises the following components in parts by mass:
the molecular formula of the hexadecanol glucose dimeric surfactant is as follows:
the molecular formula of the quaternary ammonium salt cationic polymer is as follows:
wherein the viscosity average molecular weight of the polymer is 520 ten thousand, and the hydrolysis degree is 22 percent.
The total mineralization of the simulated formation water is 27800mg/L, wherein the total mineralization of Ca 2+ 、Mg 2+ The ion content is 2455mg/L.
A preparation method of a foaming agent composition Q3 for a sensitive heavy oil reservoir comprises the following steps:
and uniformly mixing the cetyl glucose gemini surfactant, the quaternary ammonium salt cationic polymer, the hexadecyl betaine and the simulated water according to the formula amount to obtain a foaming agent composition Q3.
Performance evaluation of foaming agent compositions Q1, Q2 and Q3 for sensitive heavy oil reservoir
The experiment aims at a certain heavy oil reservoir K of a victory oil field, the reservoir temperature is 65 ℃, the crude oil viscosity is 14550mPa.s, the experiment belongs to common heavy oil, the emulsified water content is 18.6%, the total mineralization degree of injected water is 16553mg/L, wherein Ca 2+ The content of Mg is 525Mg/L 2+ The content is 240mg/L.
The foaming agent compositions Q1, Q2 and Q3 for sensitive heavy oil reservoirs prepared in examples 1 to 3 and commercially available foaming agents PA-1 and PA-2 were mixed with gas, respectively, and the resistance factor, viscosity reduction rate, oil displacement efficiency and anti-swelling rate of the formed foams were evaluated. The resistance factor test method refers to Q/SH10202052-2010 foaming agent for conventional foam flooding, the viscosity reduction rate evaluation method refers to Q/SH 10201519-2016 general criteria for heavy oil viscosity reducer, the oil displacement efficiency evaluation method refers to SY/T6315-2017 method for measuring high-temperature relative permeability and oil displacement efficiency of heavy oil reservoir, the anti-swelling rate evaluation method refers to SY/T5971-2016 method for evaluating performances of clay stabilizer for oil and gas field fracturing acidification and water injection, and the results are shown in Table 1.
TABLE 1 results of performance testing of foam compositions Q1, Q2, Q3 and commercially available foams PA-1 and PA-2
The change curve of the resistance factor of the nitrogen foam formed by the foaming agent composition Q1 for the sensitive heavy oil reservoir at the temperature of 65 ℃ along with the injection quantity is shown in figure 1.
According to the evaluation results, the foaming agent compositions Q1, Q2 and Q3 for the sensitive heavy oil reservoir have a strong profile control effect at the reservoir temperature, the resistance factors are all over 440, the maximum Q2 is 721, and the resistance factors of the commercially available foaming agents PA-1 and PA-2 are 289 and 221 respectively and are obviously lower than the foaming agent compositions Q1, Q2 and Q3 for the sensitive heavy oil reservoir.
The foaming agent compositions Q1, Q2 and Q3 for the sensitive heavy oil reservoir can form emulsions with crude oil, the viscosity reduction rate is over 95 percent, and the maximum Q2 reaches 99.8 percent, which is equivalent to the viscosity reduction rate level of commercially available foaming agents PA-1 and PA-2.
The oil washing rates of the foaming agent compositions Q1, Q2 and Q3 for the sensitive heavy oil reservoir are all more than 20 percent, while the oil washing rates of the commercially available foaming agents PA-1 and PA-2 are respectively 14.1 percent and 12.8 percent and are obviously lower than the foaming agent compositions Q1, Q2 and Q3 for the sensitive heavy oil reservoir disclosed by the invention.
The anti-swelling rates of the foaming agent compositions Q1, Q2 and Q3 for the sensitive heavy oil reservoir are all more than 82 percent, while the anti-swelling rates of the commercially available foaming agents PA-1 and PA-2 are all less than 8 percent, and almost no expansion inhibition effect is achieved.
The foaming agent compositions Q1, Q2 and Q3 of the invention all meet the relevant requirements of oil fields, have excellent comprehensive performance compared with the foaming agent sold in the market, and can meet the development requirements of sensitive heavy oil reservoirs.
Example 4
A foaming agent composition for sensitive heavy oil reservoirs comprises the following components in parts by weight:
0.5 part of a fatty alcohol glucose gemini surfactant represented by the formula (1);
0.5 part of quaternary ammonium salt cation component;
0.2 part of betaine type zwitterionic surfactant;
98.8 parts of water, wherein:
the structural formula of the fatty alcohol glucose gemini surfactant is as follows:
wherein R is 1 Is a long-chain alkyl radical C 8 H 17 ；
The quaternary ammonium salt cation component is a quaternary ammonium salt cationic surfactant shown in a formula (2); the structural formula of the quaternary ammonium salt cationic surfactant shown in the formula (2) is as follows:
wherein R is 2 Is a long-chain alkyl radical C 8 H 17 ；
R 3 Is benzyl;
x is Br;
the betaine type zwitterionic surfactant is alkyl betaine shown in a formula (4);
the structural formula of the alkyl betaine represented by the formula (4) is as follows:
wherein R is 6 Is a long-chain alkyl radical C 18 H 37 。
Further, the water is formation water, the total mineralization of the formation water is 10355mg/L, wherein the Ca content 2+ 、Mg 2+ The ion content was 658mg/L.
A preparation method of a foaming agent composition for a sensitive heavy oil reservoir comprises the following steps:
uniformly mixing the fatty alcohol glucose gemini surfactant, the quaternary ammonium salt cationic component, the betaine type zwitter-ion surfactant and water according to the formula ratio to obtain the foaming agent composition for the sensitive heavy oil reservoir.
The foaming agent composition is applied to the exploitation process of a sensitive heavy oil and heavy oil reservoir.
Examples 5 to 9
Is substantially the same as example 4, except that: the substituent R in the structural formula of the quaternary ammonium salt cationic surfactant shown in the formula (2) 2 、R 3 And X is different:
examples 10 to 13
Is substantially the same as example 4, except that: formula (4) isStructural formula substituent R of alkyl betaine 6 The difference is as follows:
| R 6 | |
| example 10 | C 12 H 25 |
| Example 11 | C 14 H 29 |
| Example 12 | C 20 H 41 |
| Example 13 | C 24 H 49 |
Example 14
A foaming agent composition for sensitive heavy oil reservoirs comprises the following components in parts by weight:
9 parts of a fatty alcohol glucose gemini surfactant represented by the formula (1);
9 parts of a quaternary ammonium salt-based cationic component;
4 parts of betaine type zwitterionic surfactant;
78 parts of water, wherein:
the structural formula of the fatty alcohol glucose gemini surfactant is as follows:
wherein R is 1 Is a long-chain alkyl radical C 12 H 25 ；
The quaternary ammonium salt cation component is quaternary ammonium salt cation polymer shown in formula (3);
the structural formula of the quaternary ammonium salt cationic polymer shown in the formula (3) is as follows:
wherein R is 4 Is methyl;
R 5 is methyl;
m＝80000；
n＝182000。
the betaine type zwitterionic surfactant is alkyl sulfobetaine shown in a formula (5);
the structural formula of the alkyl sulfobetaine shown in the formula (5) is as follows:
wherein R is 7 Is a long-chain alkyl radical C 12 H 25 ；
R 8 Is an ethyl group.
Further, the viscosity average molecular weight of the quaternary ammonium salt cationic polymer is 2406 ten thousand.
Further, the water is seawater.
A preparation method of a foaming agent composition for a sensitive heavy oil reservoir comprises the following steps:
uniformly mixing the fatty alcohol glucose gemini surfactant, the quaternary ammonium salt cationic component, the betaine type zwitterionic surfactant and water according to the formula ratio to obtain the foaming agent composition for the sensitive heavy oil reservoir.
The foaming agent composition is applied to the exploitation of a sensitive heavy oil and heavy oil reservoir.
Examples 15 to 19
Is substantially the same as example 14 except that: substituent R of structural formula of quaternary ammonium salt cationic polymer 4 、R 5 M, n, molecular weight are different;
examples 20 to 24
Substantially the same as example 14, except that the substituent R of the structural formula of the alkyl sulfobetaine represented by the formula (5) 7 And R 8 The difference is as follows:
| R 7 | R 8 | |
| example 20 | C 14 H 29 | Isopropyl group |
| Example 21 | C 24 H 49 | Propyl radical |
| Example 22 | C 20 H 41 | Isopropyl group |
| Example 23 | C 18 H 37 | Propyl radical |
| Example 24 | C 16 H 33 | Isopropyl group |
The embodiments of the present invention have been described in detail. However, the present invention is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (10)
1. The foaming agent composition for the sensitive heavy oil reservoir is characterized by comprising the following components in parts by weight:
0.2-10 parts of fatty alcohol glucose gemini surfactant;
0.1-10 parts of quaternary ammonium salt cation component;
0.1-5 parts of betaine type zwitterionic surfactant;
75 to 99.6 portions of water.
2. The foaming agent composition for sensitive heavy oil reservoirs as claimed in claim 1, wherein the fatty alcohol glucose gemini surfactant has a structural formula shown in formula (1):
wherein R is 1 Is a C8-C24 long-chain alkyl group, preferably a C12-C16 long-chain alkyl group.
3. The foam composition for sensitive heavy oil reservoirs according to claim 1, wherein the quaternary ammonium salt cationic component is a quaternary ammonium salt cationic surfactant represented by formula (2) or a quaternary ammonium salt cationic polymer represented by formula (3);
the quaternary ammonium salt cationic surfactant has the following structural formula:
wherein R is 2 Is C8-C24 long-chain alkyl, preferably C12-C18 long-chain alkyl;
R 3 is benzyl or methyl;
x is Cl, br or OH;
the quaternary ammonium salt cationic polymer has the following structural formula:
wherein R is 4 Is a C1-C8 linear alkyl or branched alkyl, preferably C1-C3 linear alkyl;
R 5 is benzyl or methyl;
m＝3000-80000；
n＝3000-182000。
4. the foam composition for sensitive heavy oil reservoirs according to claim 1, wherein the betaine type zwitterionic surfactant is an alkyl betaine represented by formula (4) or an alkyl sulfobetaine represented by formula (5);
the alkyl betaines have the following structural formula:
wherein R is 6 Is C12-C24 long-chain alkyl, preferably C12-C18 long-chain alkyl;
the alkyl sulfobetaines have the following structural formula:
wherein R is 7 Is C12-C24 long-chain alkyl, preferably C12-C18 long-chain alkyl;
R 8 is C2-C3 alkyl.
5. The foaming agent composition for sensitive heavy oil reservoirs as claimed in claim 3, wherein the viscosity average molecular weight of the quaternary ammonium salt cationic polymer is 300-5000 ten thousand.
6. The foaming agent composition for sensitive heavy oil reservoirs as claimed in claim 1, wherein the water is one of tap water, simulated formation water, formation water and seawater.
7. The foaming agent composition for sensitive heavy oil reservoirs as claimed in claim 1, wherein the mass ratio of the fatty alcohol glucose gemini surfactant to the quaternary ammonium salt cation component is 0.5-20, preferably 1-5.
8. The foaming agent composition for sensitive heavy oil reservoirs as claimed in claim 1, wherein the mass ratio of the fatty alcohol glucose gemini surfactant to the betaine type zwitterionic surfactant is 1-40, preferably 2-10.
9. The preparation method of the foaming agent composition for the sensitive heavy oil reservoir is characterized by comprising the following steps of:
uniformly mixing the fatty alcohol glucose gemini surfactant, the quaternary ammonium salt cationic component, the betaine type zwitterionic surfactant and water according to the formula ratio to obtain the foaming agent composition for the sensitive heavy oil reservoir.
10. Use of the foam composition according to any one of claims 1 to 8 for the recovery of sensitive heavy oil reservoirs.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102895915A (en) * | 2012-09-21 | 2013-01-30 | 浙江大学 | Tetradecanol glucose gemini surfactant and preparation method thereof |
| CN104130767A (en) * | 2014-07-14 | 2014-11-05 | 安徽奔马先端科技有限公司 | Salt-resistant and acid-resistant concentrated foaming agent as well as preparation method and application thereof |
| CN109810685A (en) * | 2017-11-20 | 2019-05-28 | 中国石油化工股份有限公司 | Oil displacement agent composition and its preparation method and application |
| CN110055045A (en) * | 2019-04-26 | 2019-07-26 | 中国石油化工股份有限公司 | A kind of low poly-cationic quaternary surfactant Synergistic type oil displacement agent |
| CN110776893A (en) * | 2018-07-31 | 2020-02-11 | 中国石油化工股份有限公司 | Low-interfacial-tension strong-foam oil displacement agent |
-
2021
- 2021-09-28 CN CN202111141917.XA patent/CN115873578A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102895915A (en) * | 2012-09-21 | 2013-01-30 | 浙江大学 | Tetradecanol glucose gemini surfactant and preparation method thereof |
| CN104130767A (en) * | 2014-07-14 | 2014-11-05 | 安徽奔马先端科技有限公司 | Salt-resistant and acid-resistant concentrated foaming agent as well as preparation method and application thereof |
| CN109810685A (en) * | 2017-11-20 | 2019-05-28 | 中国石油化工股份有限公司 | Oil displacement agent composition and its preparation method and application |
| CN110776893A (en) * | 2018-07-31 | 2020-02-11 | 中国石油化工股份有限公司 | Low-interfacial-tension strong-foam oil displacement agent |
| CN110055045A (en) * | 2019-04-26 | 2019-07-26 | 中国石油化工股份有限公司 | A kind of low poly-cationic quaternary surfactant Synergistic type oil displacement agent |
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