CN115726749A - High-temperature and high-pressure environment CO 2 Method for improving miscible flooding recovery ratio - Google Patents
High-temperature and high-pressure environment CO 2 Method for improving miscible flooding recovery ratio Download PDFInfo
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- 238000011084 recovery Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000007864 aqueous solution Substances 0.000 claims abstract description 81
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 37
- 239000002245 particle Substances 0.000 claims abstract description 35
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims abstract description 31
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims abstract description 29
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- 239000000243 solution Substances 0.000 claims description 22
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Abstract
The invention discloses CO in a high-temperature and high-pressure environment 2 The method for improving the miscible phase flooding recovery ratio comprises the following steps: s1, injecting a front slug: injecting an assistant driving agent aqueous solution into the oil layer to be used as a preposed assistant driving slug; wherein, in the assistant flooding agent aqueous solution, the aqueous solution comprises 0.01 to 0.05 weight percent of NaCl0.01 to 0.05 weight percent of Na based on the total weight of the aqueous solution 2 SO 4 0.08～0.2wt、CaCl 2 0.16～0.3wt、MgSO 4 0.2 to 0.4 weight percent, 0.8 to 1.2 weight percent of sodium dodecyl benzene sulfonate and the balance of water; the concentration of the nano zirconium dioxide particles is 100-1000 mg/L; s2, injecting a main section plug: injecting supercritical CO into oil layer 2 As a main slug. Nano zirconium dioxide particleThe adsorption of the nano agglomerates under low salinity makes more surfactant molecules in the aqueous solution fully utilized under the condition of low salinity, and is beneficial to the formation of the nano agglomerates, so that the adsorption generated by the nano agglomerates formed on the surface of the rock improves the wettability.
Description
Technical Field
The invention relates to CO 2 The technical field of oil displacement, in particular to CO in high-temperature and high-pressure environment 2 A method for improving miscible phase displacement recovery efficiency.
Background
At present, with the continuous development and progress of science and technology, the global warming phenomenon is more and more severe. Carbon capture, CO 2 Utilization and Sequestration (CCUS) is one of the key technologies to cope with global climate change. Wherein, CO 2 Oil displacement technology (CO) 2 enhanced oil recovery,CO 2 EOR) is one of the important means, and can realize CO recovery while improving the crude oil recovery 2 The sequestration of (2) is commonly used for tertiary oil recovery.
CO 2 The oil displacement technology is divided into miscible flooding and non-miscible flooding, and the key for distinguishing the miscible flooding and the non-miscible flooding is Minimum Miscible Pressure (MMP). CO when pressures are higher than MMP 2 The interface between the oil and the crude oil disappears, the interfacial tension (IFT) is zero, and the oil and the gas are mixed and dissolved, so how to reduce CO 2 The minimum miscible pressure with crude oil below the reservoir pressure is CO 2 The miscible phase flooding method is very important.
In addition, the wettability of the low-permeability rock has an important influence on the complex oil displacement efficiency, the stronger the hydrophilicity of the rock surface is, the smaller the minimum permeability value of the activated residual oil of the complex system is, and the greater the degree of the enhanced recovery ratio of the complex flooding is. That is, compound flooding is more suitable for hydrophilic wetted rocks.
In recent years, many scholars at home and abroad propose to reduce CO with a surfactant 2 Minimum miscible pressure with crude oil. For example, chinese patent CN111058816A provides a method for increasing CO 2 Method for miscible-phase flooding recovery in CO 2 In the process of miscible phase flooding, supercritical CO can be improved by adding 2 Chemical agent of mixed phase drive system macro-viewing viscosity, thereby further improving supercritical CO 2 Improving the low-permeability reservoir CO 2 And (4) miscible phase flooding recovery.
For example, chinese patent CN113881417A relates to a chemical composition containing sorbitan polyether carboxylate, its preparation method and its CO reduction 2 Driving out minimum miscible pressureMethod of reducing CO by chemical agent composition 2 Interfacial tension with crude oil, thereby lowering the minimum miscible pressure of the two.
For example, chinese patent CN114876425A proposes a method for displacing oil from a low permeability reservoir, in which an oil displacement assistant is a mixture of a polystyrene-acrylamide copolymer and polyvinylpyrrolidone in a mass ratio of (3) - (7), and the two have a synergistic effect, thereby effectively avoiding the phenomena of gas channeling and viscous fingering during carbon dioxide oil displacement, and greatly improving the oil displacement effect of carbon dioxide.
It is worth noting that Chinese patent CN110317598A discloses a method for improving compact reservoir CO 2 The water solution with flooding effect is prepared with wetting modifier, penetrant and surfactant to lower the interfacial tension of oil and water 2 Flooding of aqueous solutions with CO 2 Alternately injecting into oil reservoir, changing the wettability of matrix micropore surface with wettability changing agent, permeating surfactant molecule capable of reducing oil-water interfacial tension into matrix micropore under the promotion of penetrant, driving crude oil out of micropore by imbibition and other action, reaching crack in CO 2 The displacement of the oil displacement agent achieves the effect of improving the recovery ratio of crude oil.
However, the prior art has been relatively less investigated for aqueous solution of a flooding assistant suitable for high temperature, high pressure reservoir conditions. Moreover, the research on the auxiliary driving agent in the prior art mainly aims at improving the supercritical CO 2 Viscosity of (2) to increase recovery efficiency, overall consideration of CO 2 The literature relating to interfacial tension between crude oils and rock wettability is very lacking.
Therefore, research on a method suitable for high-temperature and high-pressure reservoir conditions by reducing CO 2 Interfacial tension during oil displacement and hydrophilicity of rock surface are improved, thereby improving CO 2 The method for recovering the crude oil by miscible phase flooding is a technical problem which needs to be solved urgently in the field.
Disclosure of Invention
The invention provides CO in a high-temperature and high-pressure environment 2 Method for improving miscible flooding recovery ratio, aiming at reducing CO 2 Interfacial tension and rock improvement during oil displacementHydrophilicity of stone surface to increase CO 2 And (4) mixed-phase flooding crude oil recovery.
The technical scheme of the invention is as follows:
the invention provides CO in a high-temperature and high-pressure environment 2 The method for improving the miscible phase flooding recovery ratio comprises the following steps:
s1, injecting a front slug:
injecting an assistant driving agent aqueous solution into the oil layer to be used as a preposed assistant driving slug;
wherein, in the assistant flooding agent aqueous solution, the aqueous solution comprises 0.01 to 0.05 weight percent of NaCl and Na based on the total weight of the aqueous solution 2 SO 4 0.08～0.2wt％、CaCl 2 0.16～0.3wt％、MgSO 4 0.2 to 0.4 weight percent, 0.8 to 1.2 weight percent of Sodium Dodecyl Benzene Sulfonate (SDBS), and the balance of water;
the concentration of the nano zirconium dioxide particles is 100-1000 mg/L;
s2, injecting a main section plug:
injecting supercritical CO into oil layer 2 As a main slug.
Furthermore, the average particle diameter of the nano zirconium dioxide particles is less than or equal to 100nm.
Further, in the assistant driving agent aqueous solution, the aqueous solution comprises 0.02wt% of NaCl and Na based on the total weight of the aqueous solution 2 SO 4 0.15wt％、CaCl 2 0.2wt％、MgSO 4 0.35wt%, sodium Dodecyl Benzene Sulfonate (SDBS) 1.2wt%, and the balance of water.
Further, the concentration of the nano zirconium dioxide particles is 500mg/L.
Further, the assistant flooding agent aqueous solution and the supercritical CO 2 The ratio of the injection amount of (1): 3 to 2:3.
Further, in the S1, the injection speed of the assistant flooding agent aqueous solution is 1-2 m 3 In the S2, supercritical CO 2 The injection speed of (2) is 1 to 2m 3 /h。
Further, the preparation method of the assistant flooding agent aqueous solution comprises the following steps:
s11, weighing NaCl and Na 2 SO 4 、CaCl 2 、MgSO 4 Sodium dodecyl benzene sulfonate and nano zirconium dioxide particles;
s12, mixing NaCl and Na 2 SO 4 、CaCl 2 、MgSO 4 Adding sodium dodecyl benzene sulfonate into water, and stirring the aqueous solution to prepare an aqueous solution with the required salinity concentration;
and S13, adding nano zirconium dioxide particles into the aqueous solution, and dispersing the nano zirconium dioxide particles into the aqueous solution by using ultrasound to prepare the driving assistant aqueous solution.
Further, in S12, the preparation method of the aqueous solution is as follows:
s121, mixing NaCl and Na 2 SO 4 、CaCl 2 、MgSO 4 And sodium dodecyl benzene sulfonate is added into water, and the water solution is stirred to prepare a high-salinity water solution;
s122, adding water into the high-salinity aqueous solution, stirring, and diluting by 10 times to prepare a low-salinity aqueous solution;
and S123, adding ultrapure water into the low-salinity water solution, stirring, and diluting the water solution to the required concentration.
Further, in the S12, the aqueous solution is stirred at 400 to 600rpm at 20 ℃ using a magnetic stirrer.
Further, in S13, the ultrasonic treatment power is 240W, the ultrasonic treatment is performed 3 to 5 times, each time lasts for 15 to 20 minutes, and the interval between the two ultrasonic treatments is 5 minutes.
Further, the reservoir conditions applicable to the improving method are as follows: 60-90 ℃ and 20-30 MPa.
By adopting the technical scheme, the invention has the beneficial effects that:
1. ca having positive charge 2+ And Mg 2+ With anionic surfactant head group structure or negatively charged SO 4- Combined to make the head group structure of the anionic surfactant and the SO with negative charge 4- Can be attached to the surface of the nano zirconium dioxide particles, and is helpful to improve the diffusivity of the assistant flooding agent aqueous solution and enhance the effectiveness of nano aggregates at the interface, thereby reducing the interfacial tension.
2. The adsorption of nano agglomerate of nano zirconium dioxide particle in low salinity makes it possible to utilize the surfactant molecules in water solution fully and to form nano agglomerate, so that the adsorption of nano agglomerate on rock surface improves the wettability.
3. By configuring the mass ratio of each substance in the assistant flooding agent aqueous solution, the mass ratio of divalent cations to sulfate ions is in a proper range, the concentration of the nano zirconium dioxide particles is 100-1000 mg/L, nano agglomerates formed by the surfactant and surfactant molecules generate co-adsorption on the surfaces of the nano zirconium dioxide particles, and the nano agglomerates and the surfactant molecules are synergetic and interact, so that the hydrophilicity of the rock surface can be improved on the premise of not increasing the interfacial tension.
Detailed Description
All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The embodiment provides CO in high-temperature and high-pressure environment 2 The method for improving the miscible phase flooding recovery ratio is suitable for reservoir conditions of 60-90 ℃ and 20-30 MPa, and comprises the following steps:
s1, injecting a front slug:
injecting the water solution of the driving assistant agent into the oil layer as a preposed driving assistant slug, wherein the injection speed of the water solution of the driving assistant agent is 1-2 m 3 /h；
The aqueous solution comprises 0.01 to 0.05 weight percent of NaCl and Na based on the total weight of the aqueous solution 2 SO 4 0.08～0.2wt％、CaCl 2 0.16～0.3wt％、MgSO 4 0.2 to 0.4 weight percent, 0.8 to 1.2 weight percent of Sodium Dodecyl Benzene Sulfonate (SDBS), and the balance of water;
the concentration of the nano zirconium dioxide particles is 100-1000 mg/L; .
It is understood that NaCl and Na 2 SO 4 As monovalent salt, caCl 2 And MgSO 4 As a divalent salt, a divalent cation and SO 4 2– Compared with other ions, hasThe most viscous oil-water interface is beneficial to petroleum recovery; sodium Dodecyl Benzene Sulfonate (SDBS) can be used as an anionic surfactant, has good surface activity and strong hydrophilicity, effectively reduces the tension of an oil-water interface, and achieves the emulsification effect.
S2, injecting a main section plug:
injecting supercritical CO into oil layer 2 As a main slug, the assistant flooding agent aqueous solution and the supercritical CO 2 The ratio of the injection amount of (1): 3 to 2:3; supercritical CO 2 The injection speed of (2) is 1 to 2m 3 /h。
In this embodiment, the method for preparing the flooding assistant aqueous solution is as follows:
s1, weighing NaCl and NaSO 4 、CaCl 2 、MgSO 4 Sodium dodecyl benzene sulfonate and nano zirconium dioxide particles;
s2, adding NaCl and NaSO 4 、CaCl 2 、MgSO 4 And sodium dodecyl benzene sulfonate is added into water, and a magnetic stirrer is used for stirring the aqueous solution at the temperature of 20 ℃ and the rpm of 400-600 so as to prepare a high-salinity aqueous solution;
s3, adding water into the high-salinity water solution, stirring, and diluting by 10 times to prepare a low-salinity water solution;
s4, adding ultrapure water into the low-salinity water solution, stirring, and diluting the water solution to the required concentration;
s5, adding nano zirconium dioxide particles into the aqueous solution, and dispersing the nano zirconium dioxide particles in the aqueous solution by using ultrasound to prepare an assistant flooding agent aqueous solution, wherein the ultrasonic treatment power is 240W, the ultrasonic treatment is performed for 3-5 times, each time lasts for 15-20 minutes, and the interval between the two ultrasonic treatments is 5 minutes so as to avoid overheating.
In the preparation process of the water solution of the flooding assistant, the high-salinity water solution is prepared firstly and then diluted step by step so as to reduce the negative influence caused by weighing error, and the ultrapure water is used for diluting the water solution so as to eliminate the negative influence caused by impurities.
Example 1:
high-temperature and high-pressure environment CO 2 The method for improving the miscible phase flooding recovery ratio comprises the following steps:
s1, injecting a front slug:
injecting 2095m into the oil layer 3 The injection speed of the assistant flooding agent aqueous solution is 1.5m 3 /h；
Wherein, in the assistant flooding agent aqueous solution, the aqueous solution comprises 0.01wt% of NaCl and Na based on the total weight of the aqueous solution 2 SO 4 0.08wt％、CaCl 2 0.16wt％、MgSO 4 0.2wt%, 0.8 wt% of sodium dodecyl benzene sulfonate and the balance of water;
the concentration of the nano zirconium dioxide particles is 500mg/L;
s2, injecting a main section plug:
injecting 3905m into an oil layer 3 Supercritical CO 2 Supercritical CO 2 Injection velocity of (2) is 1.5m 3 /h。
Example 2:
the difference from example 1 is that: in the assistant flooding agent aqueous solution, the aqueous solution comprises 0.02wt% of NaCl and Na based on the total weight of the aqueous solution 2 SO 4 0.15wt％、CaCl 2 0.2wt％、 MgSO 4 0.35wt%, sodium dodecyl benzene sulfonate 1.2wt%, and the balance of water;
the rest is the same as in example 1.
Example 3:
the difference from example 1 is that: in the assistant flooding agent aqueous solution, the aqueous solution comprises 0.03wt% of NaCl and Na based on the total weight of the aqueous solution 2 SO 4 0.17wt％、CaCl 2 0.25wt％、 MgSO 4 0.35wt%, sodium dodecyl benzene sulfonate 1.2wt%, and the balance of water;
the rest is the same as in example 1.
Example 4:
the difference from example 1 is that: in the assistant flooding agent aqueous solution, the aqueous solution comprises 0.05wt% of NaCl and Na based on the total weight of the aqueous solution 2 SO 4 0.2wt％、CaCl 2 0.3wt％、MgSO 4 0.4wt%, 1.2wt% of sodium dodecyl benzene sulfonate and the balance of water;
the rest is the same as in example 1.
Example 5:
the difference from example 2 is that the concentration of nano-zirconia particles is 100mg/L, and the other is the same as example 2.
Example 6:
the difference from example 2 is that the concentration of nano-zirconia particles is 1000mg/L, and the other is the same as example 2.
Comparative example 1:
high-temperature and high-pressure environment CO 2 The method for improving the miscible phase flooding recovery ratio comprises the following steps:
s1, injecting a front slug:
injecting 2095m into the oil layer 3 The mass concentration of the assistant flooding agent aqueous solution is 2 percent, and the injection speed of the assistant flooding agent aqueous solution is 1.5m 3 /h；
Wherein the assistant flooding agent aqueous solution is sodium dodecyl benzene sulfonate assistant flooding agent aqueous solution, and the aqueous solution comprises 1.2wt% of sodium dodecyl benzene sulfonate and the balance of water based on the total weight of the aqueous solution;
s2, injecting a main section plug:
injecting 3905m into an oil layer 3 Supercritical CO 2 Supercritical CO 2 Injection velocity of (2) is 1.5m 3 /h。
Comparative example 2:
the difference from example 2 is that: the concentration of the nano zirconium dioxide particles is 0mg/L;
the rest is the same as in example 2.
Comparative example 3:
the difference from example 2 is that: the concentration of the nano zirconium dioxide particles is 1500mg/L;
the rest was the same as in example 2.
Comparative example 4:
high-temperature and high-pressure environment CO 2 The method for improving the miscible flooding recovery ratio comprises the following steps: injecting 6000 m into the oil layer 3 Supercritical CO 2 Supercritical CO 2 Is 1.5m 3 /h。
A certain high-temperature, high-pressure and low-permeability oilfield is used as a test area, and 10 oil production wells are arranged in the test area, wherein a No. 1-6 oil production well is used as a test well of examples 1-6, a No. 7-10 oil production well is used as a test well of comparative examples 1-4, the average temperature of a reservoir layer in the test area is 80 ℃, and the average pressure is 25MPa.
The oil recovery of No. 10 oil recovery well is taken as a reference standard, the increase rate of the oil recovery of No. 1-9 oil recovery well compared with the oil recovery of No. 10 oil recovery well is calculated, and the result is shown in the following table:
TABLE 1 oil recovery increase rates of examples 1 to 6 and comparative examples 1 to 3
| Serial number | Rate of increase |
| No. 1 well | 28.1％ |
| No. 2 well | 29.5％ |
| No. 3 well | 28.3％ |
| No. 4 well | 28.0％ |
| No. 5 well | 29.2％ |
| No. 6 well | 29.0％ |
| No. 7 well | 20.5％ |
| No. 8 well | 22.8％ |
| No. 9 well | 23.9％ |
It can be seen that, compared with comparative example 4, it is also obvious that the recovery ratio can be significantly improved by injecting the ordinary assistant water solution into the oil layer as the front assistant slug in comparative example 1.
In examples 1 to 6, the assistant flooding agents were NaCl and Na, as compared with comparative example 1 2 SO 4 、CaCl 2 、MgSO 4 Compared with the mixture of sodium dodecyl benzene sulfonate and nano zirconium dioxide particles in the comparative example 1, the recovery ratio is greatly improved by only injecting a common assistant driving agent aqueous solution into an oil layer as a front assistant driving slug.
As can be seen from comparison of the results of examples 1 to 6, the aqueous solution comprises 0.01 to 0.05wt% of NaCl, and Na, based on the total weight of the aqueous solution 2 SO 4 0.08～0.2wt、CaCl 2 0.16～0.3wt、MgSO 4 0.2 to 0.4 weight percent, 0.8 to 1.2 weight percent of sodium dodecyl benzene sulfonate and the balance of water; the concentration of the nano zirconium dioxide particles is 100-1000 mg/L, and the recovery ratio can be effectively improved; preferably, the aqueous solution comprises 0.02wt% NaCl, na 2 SO 4 0.15wt、CaCl 2 0.2wt、MgSO 4 0.35wt percent of Sodium Dodecyl Benzene Sulfonate (SDBS) 1.2wt percent of water, and the concentration of the nano zirconium dioxide particles is 500mg/L.
As can be seen from comparison of the results of comparative example 2 and comparative example 2, the nano zirconium dioxide particles are added to the aqueous solution of the driving assistant, SO that the recovery ratio can be effectively increased due to the head group structure of the positively charged divalent cation and the anionic surfactant or the negatively charged SO 4- Combine to make the head group structure of anionic surfactant and SO with negative charge 4- Surface capable of being attached to nano zirconium dioxide particlesThe surface is beneficial to improving the diffusivity of the assistant flooding agent aqueous solution and enhancing the effectiveness of nano aggregates at the interface, thereby reducing the interface tension; the adsorption of nano-aggregate of nano-zirconia particles in low salinity makes full use of more surfactant molecules in the aqueous solution under the condition of low salinity, which is beneficial to the formation of nano-aggregate, so that the adsorption generated by nano-aggregate formed on the surface of rock improves the wettability.
However, as can be seen from comparative example 3, it is not preferable to add the nano zirconia particles too much because, with a low concentration of divalent cations, some of the anionic surfactant alone adsorbs on the surface of the surplus nano zirconia particles to form negatively charged nano aggregates, and the increase of the negatively charged nano aggregates increases the interfacial tension.
In the embodiment, the mass ratio of each substance in the assistant flooding agent aqueous solution is configured so that the mass ratio of divalent cations to sulfate ions is in a proper range, the concentration of the nano zirconium dioxide particles is 100-1000 mg/L, nano agglomerates formed by the surfactant and surfactant molecules generate co-adsorption on the surfaces of the nano zirconium dioxide particles, and the nano agglomerates and the surfactant molecules cooperate and interact with each other, so that the hydrophilicity of the rock surface can be improved on the premise of not increasing the interfacial tension.
The foregoing is illustrative of the best mode contemplated for carrying out the present invention and the details not specifically mentioned are within the knowledge of one of ordinary skill in the art. The protection scope of the present invention is subject to the content of the claims, and any equivalent changes based on the technical teaching of the present invention are also within the protection scope of the present invention.
Claims (10)
1. High-temperature and high-pressure environment CO 2 The method for improving the miscible phase flooding recovery ratio is characterized by comprising the following steps of:
s1, injecting a front slug:
injecting an assistant driving agent aqueous solution into the oil layer to be used as a preposed assistant driving slug;
wherein, in the assistant flooding agent aqueous solution, the weight of the assistant flooding agent aqueous solution is calculated according to the total weight of the aqueous solutionThe aqueous solution comprises 0.01 to 0.05 weight percent of NaCl0.01 to Na 2 SO 4 0.08～0.2wt％、CaCl 2 0.16～0.3wt％、MgSO 4 0.2 to 0.4 weight percent, 0.8 to 1.2 weight percent of sodium dodecyl benzene sulfonate and the balance of water;
the concentration of the nano zirconium dioxide particles is 100-1000 mg/L;
s2, injecting a main section plug:
injecting supercritical CO into oil layer 2 As a main slug.
2. The high temperature, high pressure environment CO of claim 1 2 The method for improving the miscible phase flooding recovery efficiency is characterized by comprising the following steps: in the assistant flooding agent aqueous solution, the aqueous solution comprises 0.02wt% of NaCl and Na based on the total weight of the aqueous solution 2 SO 4 0.15wt％、CaCl 2 0.2wt％、MgSO 4 0.35wt%, sodium dodecyl benzene sulfonate 1.2wt%, and the balance of water.
3. High temperature, high pressure environment CO as recited in claim 2 2 The method for improving the miscible phase flooding recovery efficiency is characterized by comprising the following steps: the concentration of the nano zirconium dioxide particles is 500mg/L.
4. High temperature, high pressure environment CO as recited in claim 1 2 The method for improving the miscible phase flooding recovery efficiency is characterized by comprising the following steps: the flooding assistant aqueous solution and the supercritical CO 2 The ratio of the injected amount of (1): 3 to 2:3.
5. high temperature, high pressure environment CO as recited in claim 1 2 The method for improving the miscible phase flooding recovery ratio is characterized by comprising the following steps: in the S1, the injection speed of the assistant flooding agent aqueous solution is 1-2 m 3 In said S2, supercritical CO 2 The injection speed of (2) is 1 to 2m 3 /h。
6. The high temperature, high pressure environment CO of claim 1 2 The method for improving the miscible phase flooding recovery ratio is characterized by comprising the following steps: the preparation method of the assistant flooding agent aqueous solution comprises the following steps:
s11, weighing NaCl and Na 2 SO 4 、CaCl 2 、MgSO 4 Sodium dodecyl benzene sulfonate and nano zirconium dioxide particles;
s12, mixing NaCl and Na 2 SO 4 、CaCl 2 、MgSO 4 Adding sodium dodecyl benzene sulfonate into water, and stirring the aqueous solution to prepare an aqueous solution with the required salinity concentration;
and S13, adding nano zirconium dioxide particles into the aqueous solution, and dispersing the nano zirconium dioxide particles into the aqueous solution by using ultrasound to prepare the assistant driving agent aqueous solution.
7. High temperature, high pressure environment CO of claim 6 2 The method for improving the miscible phase flooding recovery ratio is characterized by comprising the following steps: in the step S12, the preparation method of the aqueous solution comprises the following steps:
s121, mixing NaCl and Na 2 SO 4 、CaCl 2 、MgSO 4 And sodium dodecyl benzene sulfonate is added into water, and the water solution is stirred to prepare a high-salinity water solution;
s122, adding water into the high-salinity water solution, stirring, and diluting by 10 times to prepare a low-salinity water solution;
and S123, adding ultrapure water into the low-salinity water solution, stirring, and diluting the water solution to the required concentration.
8. The high temperature, high pressure environment CO of claim 7 2 The method for improving the miscible phase flooding recovery ratio is characterized by comprising the following steps: in the S12, the aqueous solution was stirred at 400 to 600rpm at 20 ℃ using a magnetic stirrer.
9. The high temperature, high pressure environment CO of claim 6 2 The method for improving the miscible phase flooding recovery efficiency is characterized by comprising the following steps: in S14, the ultrasonic treatment power is 240W, the ultrasonic treatment is carried out for 3 to 5 times, each time lasts for 15 to 20 minutes, and the interval between the two ultrasonic treatments is 5 minutes.
10. The high temperature, high pressure environment CO of any one of claims 1-9 2 For mixed-phase displacement recoveryThe improvement method is characterized in that: the improved method is applicable to reservoir conditions as follows: 60-90 ℃ and 20-30 MPa.
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