CN117551443A - Preparation method of temperature-resistant salt-tolerant oil displacement channeling-blocking nano-crosslinked gelled foam system - Google Patents
Preparation method of temperature-resistant salt-tolerant oil displacement channeling-blocking nano-crosslinked gelled foam system Download PDFInfo
- Publication number
- CN117551443A CN117551443A CN202210939453.5A CN202210939453A CN117551443A CN 117551443 A CN117551443 A CN 117551443A CN 202210939453 A CN202210939453 A CN 202210939453A CN 117551443 A CN117551443 A CN 117551443A
- Authority
- CN
- China
- Prior art keywords
- temperature
- channeling
- solution
- oil displacement
- foam
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000006260 foam Substances 0.000 title claims abstract description 80
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000000243 solution Substances 0.000 claims abstract description 47
- 229920000642 polymer Polymers 0.000 claims abstract description 41
- 238000003756 stirring Methods 0.000 claims abstract description 25
- 229910017053 inorganic salt Inorganic materials 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000003381 stabilizer Substances 0.000 claims abstract description 20
- 239000003945 anionic surfactant Substances 0.000 claims abstract description 16
- 239000012266 salt solution Substances 0.000 claims abstract description 14
- 238000007789 sealing Methods 0.000 claims abstract description 13
- 238000001132 ultrasonic dispersion Methods 0.000 claims abstract description 13
- 230000032683 aging Effects 0.000 claims abstract description 4
- 230000033558 biomineral tissue development Effects 0.000 claims abstract description 4
- 229920003169 water-soluble polymer Polymers 0.000 claims abstract description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 239000007864 aqueous solution Substances 0.000 claims description 10
- 230000002209 hydrophobic effect Effects 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 9
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 230000015572 biosynthetic process Effects 0.000 claims description 8
- ROSDSFDQCJNGOL-UHFFFAOYSA-N Dimethylamine Chemical compound CNC ROSDSFDQCJNGOL-UHFFFAOYSA-N 0.000 claims description 6
- 239000008367 deionised water Substances 0.000 claims description 6
- 229910021641 deionized water Inorganic materials 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 239000011734 sodium Substances 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 238000003786 synthesis reaction Methods 0.000 claims description 6
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 5
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 5
- 239000000178 monomer Substances 0.000 claims description 4
- PQUXFUBNSYCQAL-UHFFFAOYSA-N 1-(2,3-difluorophenyl)ethanone Chemical compound CC(=O)C1=CC=CC(F)=C1F PQUXFUBNSYCQAL-UHFFFAOYSA-N 0.000 claims description 3
- ZTEHOZMYMCEYRM-UHFFFAOYSA-N 1-chlorodecane Chemical compound CCCCCCCCCCCl ZTEHOZMYMCEYRM-UHFFFAOYSA-N 0.000 claims description 3
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 3
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims description 3
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical group ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 239000003999 initiator Substances 0.000 claims description 3
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 3
- 229940047670 sodium acrylate Drugs 0.000 claims description 3
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims description 3
- 239000004289 sodium hydrogen sulphite Substances 0.000 claims description 3
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 239000003054 catalyst Substances 0.000 claims description 2
- 239000008398 formation water Substances 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 238000001291 vacuum drying Methods 0.000 claims description 2
- 238000003828 vacuum filtration Methods 0.000 claims description 2
- 239000004711 α-olefin Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 16
- 230000005465 channeling Effects 0.000 abstract description 13
- 238000011084 recovery Methods 0.000 abstract description 9
- 239000011575 calcium Substances 0.000 abstract description 5
- 150000003839 salts Chemical class 0.000 abstract description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 abstract description 2
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 abstract description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 2
- 229910001424 calcium ion Inorganic materials 0.000 abstract description 2
- 229910001425 magnesium ion Inorganic materials 0.000 abstract description 2
- 239000001301 oxygen Substances 0.000 abstract description 2
- 229910052760 oxygen Inorganic materials 0.000 abstract description 2
- 238000004090 dissolution Methods 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 29
- 238000005187 foaming Methods 0.000 description 20
- 239000003921 oil Substances 0.000 description 19
- 230000001965 increasing effect Effects 0.000 description 16
- 239000002105 nanoparticle Substances 0.000 description 10
- 239000007789 gas Substances 0.000 description 8
- 238000002347 injection Methods 0.000 description 8
- 239000007924 injection Substances 0.000 description 8
- 239000000203 mixture Substances 0.000 description 6
- 239000002245 particle Substances 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 125000001165 hydrophobic group Chemical group 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000010779 crude oil Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- GTJOHISYCKPIMT-UHFFFAOYSA-N 2-methylundecane Chemical compound CCCCCCCCCC(C)C GTJOHISYCKPIMT-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 230000015784 hyperosmotic salinity response Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- MLGWTHRHHANFCC-UHFFFAOYSA-N prop-2-en-1-amine;hydrochloride Chemical compound Cl.NCC=C MLGWTHRHHANFCC-UHFFFAOYSA-N 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
-
- 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
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/588—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific polymers
-
- 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
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/584—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants
-
- 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
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/887—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
-
- 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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/10—Nanoparticle-containing well treatment fluids
Abstract
The invention discloses a preparation method of a nano cross-linked gelled foam system for temperature-resistant salt-tolerant oil displacement and channeling sealing, which relates to the technical field of foam oil displacement, solves the technical problems of insufficient foam stability and insignificant effect on high-temperature high-salt oil reservoirs in the traditional foam flooding, and comprises the following steps: inorganic salt solution containing the same mass fraction is prepared according to stratum water mineralization data, anionic surfactant is added, stirring is carried out until complete dissolution, and hydrophobically modified nano SiO is added 2 Placing in an ultrasonic cleaner for ultrasonic dispersion for 25-35min, adding a polymer foam stabilizer, and stirring until the polymer foam stabilizer is completely dissolved; sealing the beaker of the obtained solution, and aging for 72 hours in the stratum temperature to obtain the water-soluble polymer; the invention has strong tolerance to calcium and magnesium ions and CO 2 、N 2 Can generate stable foam with the oxygen-reduced air, is suitable for oil reservoir with the temperature lower than 120 ℃, improves the temperature resistance, the salt resistance and the stability, and improves the original temperatureOil recovery.
Description
Technical Field
The invention relates to the technical field of oil and gas field exploitation, in particular to the technical field of foam flooding.
Background
With the gradual reduction of the recovery ratio of the water injection development of the oil field, the gas channeling of the gas injection development is obvious, the water content of the produced liquid is gradually increased, and the gas-liquid ratio is increased. Especially for high dip angle thick layer sandstone oil reservoir, water injection effect is poor at the top of the structure, pressure level is low and degassing is obvious. The foam injection is an anti-channeling method with remarkable effect, the anti-channeling mechanism mainly realizes the liquid flow steering effect by selectively plugging the hypertonic zone by the foam, and meanwhile, the foam has high apparent viscosity and can effectively control the gas-oil fluidity ratio, so that the swept volume of the gas is improved to the greatest extent. However, the foam itself suffers from poor stability under reservoir conditions, so most of the current research is focused on improving the stability of the foam under severe conditions.
In the field, more difficulties exist in the process of using foam flooding, particularly, almost all problems of gas channeling exist, so that sweep coefficients are reduced, and the displacement efficiency is reduced; foam systems have a great disadvantage, namely poor stability and short pot life after construction. The foam composite flooding and the reinforced foam flooding can solve the problem to a certain extent, wherein the addition of the polymer and the alkali improves the stability and the oil displacement efficiency of the foam to a certain extent, but the problem of the stability of the foam is not fundamentally solved, and the application range of the foam flooding is greatly reduced due to the introduction of the conventional polymer, and the high-temperature and high-salt oil reservoir is difficult to have obvious action effect.
Disclosure of Invention
The invention aims at: the invention provides a preparation method of a nano cross-linked gelled foam system for temperature-resistant salt-tolerant oil displacement channeling prevention, which aims to solve the technical problems that the foam stability is insufficient and the action effect on a high-temperature high-salt oil reservoir is not obvious in the traditional foam flooding.
The invention adopts the following technical scheme for realizing the purposes:
the preparation method of the temperature-resistant salt-tolerant oil displacement channeling-blocking nano crosslinked gelled foam system comprises the following steps:
(1) Adding inorganic salt into a beaker containing deionized water, and preparing inorganic salt solution containing the same mass fraction according to formation water mineralization data;
(2) Adding an anionic surfactant into the solution of the step (1), and stirring until the anionic surfactant is completely dissolved;
(3) Adding hydrophobically modified nano SiO into the solution of (2) 2 Placing in an ultrasonic cleaner for ultrasonic dispersion for 25-35min;
(4) Adding a polymer foam stabilizer into the solution of the step (3), and stirring until the polymer foam stabilizer is completely dissolved;
(5) Sealing the beaker filled with the solution obtained in the step (4), and aging for 72 hours at the formation temperature to obtain the water-soluble polymer;
the structural formula of the polymer foam stabilizer (hydrophobic association polymer ZLS-1) is as follows:
the anionic surfactant has good thermal stability and good temperature resistance.
The polymer foam stabilizer is prepared by carrying out hydrophobic modification on partially hydrolyzed polyacrylamide, wherein a hydrophobic group is grafted on a macromolecular chain of the polymer, and the macromolecular chain is aggregated in an aqueous solution through association to form a crosslinked network, so that the solution viscosity, the temperature resistance and the salt resistance can be improved.
The specific surface area of the nano particles is large, the nano particles are easier to adsorb on polymer molecules and reservoir rock Dan Biaomian and adsorb on a gas-liquid interface, and the hydrophobic nano particles can have a crosslinking effect with hydrophobic groups of the polymer, so that the connection strength between the polymer molecules and the reservoir rock Dan Biaomian is improved.
Adding hydrophobic modified nano SiO into polymer solution 2 After that, as the nano particles are negatively charged and the hydrophobic groups of the polymer are positively charged, the nano particles and polymer molecules in the solution are mutually attracted to form molecular groups, the groups can be adsorbed at the joint of the association cross-linked network, the utilization rate of the polymer molecules is improved, the integral strength of the liquid film is increased, as shown in figure 1, the free nano particles which are not combined with the polymer molecules are dispersed in the system in the form of particles, and the rigidity of the liquid film among foam bubbles is improved, so that the temperature resistance and salt tolerance of the foam system are enhanced.
Preferably, in the step (2), a magnetic stirrer is used for stirring, the rotating speed is 300-400r/min, and the stirring time is 25-35min.
Preferably, in the step (3), the ultrasonic dispersion power is 1200W, and the temperature is not higher than 50 ℃.
Preferably, the anionic surfactant is any one or two of sodium dodecyl benzene sulfonate and alpha-olefin sulfonate, and the mass fraction of the anionic surfactant is 0.30-0.50%.
Preferably, in the step (4), a magnetic stirrer is used for stirring, the rotating speed is 300-400r/min, and the stirring time is 150-200min.
Preferably, the mass fraction of the hydrophobically associating polymer is from 0.15% to 0.25%.
Preferably, the hydrophobically modified nano SiO 2 The mass fraction of (2) is 1% -2%.
Preferably, the preparation method of the polymer foam stabilizer comprises the following steps:
(1) DDAAC synthesis
Slowly adding chlorodecane into dimethylamine and sodium hydroxide aqueous solution, stirring while adding, heating after adding, dripping chloroethylene until the reaction is finished, recrystallizing the obtained solution by using ethyl acetate and absolute ethyl alcohol solution, standing for 48H, performing vacuum filtration, and performing vacuum drying at 45 ℃ to obtain DDAAC solid;
(2) Polymer foam stabilizer synthesis
Weighing three monomers of acrylamide, DDAAC and sodium acrylate according to the mass ratio of 7:2:1, and preparing an aqueous solution; introducing nitrogen into the aqueous solution for 20 minutes, adding sodium bisulphite with the mass percent of 0.15% and potassium persulfate with the mass percent of 0.05% as an initiator under the protection of nitrogen, reacting for 12 hours at 60 ℃, and drying, grinding and sieving the obtained product into granular solid to obtain the catalyst.
Preferably, the inorganic salt solution contains Na + 、Ca 2+ 、Mg 2+ Any one or more of the inorganic salt solutions.
The beneficial effects of the invention are as follows:
1. compared with the traditional foam, the nano cross-linked gel foam system of the invention can be used in oil reservoirs with obvious gas channeling and water channeling, has strong tolerance to calcium and magnesium ions and CO 2 、N 2 And the oxygen-reduced air can generate stable foam, and is suitable for sandstone oil reservoirs with the oil reservoir temperature lower than 120 ℃, the mineralization degree of stratum water lower than 200000mg/L, the crude oil viscosity of stratum lower than 120 mPa.s, the oil reservoir permeability range of 0.1mD-5000mD and the stratum fracture opening smaller than 3 mu m.
2. According to the invention, the viscosity increasing effect of the anionic surfactant and the hydrophobic association polymer and the foam stabilizing effect of the nano particles are compounded and cooperated with each other, so that the temperature resistance, the salt resistance and the stability of the system are greatly improved, and the crude oil recovery ratio can be greatly improved.
Drawings
FIG. 1 is a nano SiO 2 Schematic diagram of the principle of action between the polymer foam stabilizer and the polymer foam stabilizer;
FIG. 2 is a displacement experimental plot of the nano-crosslinked gelled foam system of example 2;
FIG. 3 is a graph showing the effect of inorganic salt concentration on foaming fluid viscosity;
FIG. 4 is a graph of the effect of inorganic salt concentration on foam half-life of a foaming liquid;
FIG. 5 is a graph showing the effect of temperature on foaming fluid viscosity;
FIG. 6 is a graph of the effect of temperature on foam half-life of a foaming liquid;
FIG. 7 is a graph showing viscosity recovery of foaming liquid.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the embodiments and the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments.
Preparation of Polymer foam stabilizer (ZLS-1):
(1) Synthesis of Dimethyl Decane Allyl Ammonium Chloride (DDAAC)
To 2g of dimethylamine and 100mL of 50% aqueous sodium hydroxide solution were slowly added 1.4g of chlorodecane while stirring, and after the addition was completed, 1.8g of vinyl chloride was heated and added dropwise until the reaction was completed. At this time, the obtained solution was recrystallized from ethyl acetate and absolute ethyl alcohol (volume ratio: 3:2), and after standing for 48H, the solution was suction-filtered under reduced pressure and vacuum-dried at 45℃to obtain DDAAC solid.
(2) ZLS-1 Synthesis
Weighing three monomers of acrylamide, DDAAC and sodium acrylate according to the mass ratio of 7:2:1, and preparing an aqueous solution with the mass fraction of 21%; introducing nitrogen into the aqueous solution for 20 minutes, adding 0.15 mass percent sodium bisulphite and 0.05 mass percent potassium persulfate serving as initiators under the protection of the nitrogen, reacting for 12 hours at 60 ℃, and drying, grinding and sieving the obtained product to obtain a granular solid, namely the product ZLS-1, wherein the structural formula is as follows:
wherein, the values of X, Y and Z are related to the addition amount of three monomers and the concentration of the prepared solution, and 300mL of aqueous solution is taken as an example, the values of X are 120000-180000, Y are 45000-50000 and Z are 100000-150000.
Example 1
The embodiment provides a preparation method of a temperature-resistant salt-tolerant nano crosslinked gelled foam system for oil displacement and channeling sealing, which comprises the following steps:
(1) 100ml deionized water was charged into a clean dry beaker to prepare 1000mg/L Ca 2+ 、 Mg 2+ An inorganic salt solution;
(2) Adding 0.3g of anionic surfactant AOS (a-alkenyl sodium sulfonate) into the solution of the step (1), placing the solution on a magnetic stirrer, placing a magnetic stirrer, setting the rotating speed to be 350r/min, and stirring for 30min to completely dissolve;
(3) 2.5g of hydrophobically modified nano SiO is added to the solution of (2) 2 Placing the particles in an ultrasonic cleaner for ultrasonic dispersion for 30min (ultrasonic dispersion power is 1200W, and upper temperature limit is 50 ℃);
(4) Adding 0.15g of polymer foam stabilizer into the solution of the step (3), placing the solution on a magnetic stirrer, placing a magnetic stirrer, setting the rotating speed to be 350r/min, and stirring for 180min to completely dissolve;
(5) Sealing the beaker filled with the solution obtained in the step (4), placing the beaker in a constant temperature box, and aging for 72 hours at the set temperature of 50 ℃;
the resulting solution (5) was the foaming liquid of example 1.
Example 2
The embodiment provides a preparation method of a temperature-resistant salt-tolerant nano crosslinked gelled foam system for oil displacement and channeling sealing, which comprises the following steps:
(1) 500mL of deionized water was placed in a clean dry beaker to prepare 100000mg/L Na + An inorganic salt solution;
(2) Adding 1g of anionic surfactant SDBS (sodium dodecyl benzene sulfonate) into the inorganic salt solution in the step (1), placing the mixture on a magnetic stirrer, placing a magnetic stirrer, setting the rotating speed to be 350r/min, and stirring for 30min until the mixture is completely dissolved;
(3) Adding 5g of hydrophobically modified nano SiO to the solution of (2) 2 Placing the particles in an ultrasonic cleaner for ultrasonic dispersion for 30min (ultrasonic dispersion power is 1200W, and upper temperature limit is 50 ℃);
(4) Adding 1g of polymer foam stabilizer into the solution in the step (3), placing the solution on a magnetic stirrer, placing a magnetic stirrer, setting the rotating speed to be 350r/min, and stirring for 180min to completely dissolve;
(5) Sealing the beaker filled with the solution obtained in the step (4), placing the beaker into a constant temperature box, setting the temperature to be 50 ℃, and keeping the temperature constant for 72 hours;
the obtained solution (5) was the foaming liquid of example 2, and the displacement experiment was performed on the nano-crosslinked gelled foam system prepared in example 2, and the result is shown in fig. 2.
As can be seen from fig. 2, in the water flooding stage, the injection pressure difference is increased, the recovery ratio is increased, and the water content is rapidly increased after 0.1 PV; the injection differential pressure is reduced after water channeling, and the recovery ratio is increased to a small extent; after the water content reaches 96%, foam is injected, recovery ratio and injection pressure difference are improved, the water content is obviously reduced, good fluidity control capability of the foam system is shown, and water channeling is effectively prevented; in the subsequent water flooding process, the injection pressure difference is reduced, but is higher than that in the water flooding stage, which means that the polymer in the foam is adsorbed, trapped and retained in the core pores, so that the permeability of the previous water channeling channel is reduced, and the final recovery ratio is improved by 41.25% compared with that of the water flooding.
Example 3
The embodiment provides a preparation method of a temperature-resistant salt-tolerant nano crosslinked gelled foam system for oil displacement and channeling sealing, which comprises the following steps:
(1) 200ml deionized water was placed in a clean dry beaker to prepare a solution containing 50000mg/L Na + ，2000mg/L Ca 2+ 、Mg 2+ An inorganic salt solution;
(2) Adding 0.6g of anionic surfactant AOS into the inorganic salt solution in the step (1), placing the mixture on a magnetic stirrer, placing a magnetic stirrer, setting the rotating speed to be 350r/min, and stirring for 30min until the mixture is completely dissolved;
(3) Adding 3g of hydrophobically modified nano SiO to the solution of (2) 2 Placing the particles in an ultrasonic cleaner for ultrasonic dispersion for 30min (ultrasonic dispersion power is 1200W, and upper temperature limit is 50 ℃);
(4) Adding 0.5g of polymer foam stabilizer into the solution of the step (3), placing the solution on a magnetic stirrer, placing a magnetic stirrer, setting the rotating speed to be 350r/min, and stirring for 180min to completely dissolve;
(5) Sealing the beaker filled with the solution obtained in the step (4), placing the beaker into a constant temperature box, setting the temperature to be 80 ℃, and keeping the temperature constant for 72 hours;
the resulting solution (5) was the foaming liquid of example 3.
Example 4
The embodiment provides a preparation method of a temperature-resistant salt-tolerant nano crosslinked gelled foam system for oil displacement and channeling sealing, which comprises the following steps:
(1) 200ml deionized water was charged into a clean dry beaker to prepare 200000mg/L Na + An inorganic salt solution;
(2) Adding 0.4g of anionic surfactant AOS and 0.1g of anionic surfactant SDBS into the inorganic salt solution of the step (1), placing the mixture on a magnetic stirrer, placing a magnetic stirrer, setting the rotating speed to be 350r/min, and stirring for 30min until the mixture is completely dissolved;
(3) Adding 3.5g of hydrophobically modified nano SiO to the solution of (2) 2 Placing the particles in an ultrasonic cleaner for ultrasonic dispersion for 30min (ultrasonic dispersion power is 1200W, and upper temperature limit is 50 ℃);
(4) Adding 0.5g of polymer foam stabilizer into the solution of the step (3), placing the solution on a magnetic stirrer, placing a magnetic stirrer, setting the rotating speed to be 350r/min, and stirring for 180min to completely dissolve;
(5) Sealing the beaker filled with the solution obtained in the step (4), placing the beaker in an oil bath constant temperature device, setting the temperature to 120 ℃, and keeping the temperature for 72 hours;
the resulting solution (5) was the foaming liquid of example 4.
The foaming liquids prepared in examples 1 to 4 were subjected to performance measurement, and the results are shown in Table I.
Performance of each foaming liquid of Table 1 and examples 1 to 4
The influence of various factors on the foaming liquid performance is examined as follows:
1. the preparation method of the foaming liquid is the same as that of example 2, and the influence of inorganic salt concentration on the viscosity of the foaming liquid and the half life of the foam is studied by taking inorganic salt concentration as a variable, and the results are shown in fig. 3 and 4, and after an appropriate amount of inorganic salt is added, the polarity of a molecular chain of the hydrophobic association polymer ZLS-1 is enhanced, the hydrophobic association effect is enhanced, the viscosity of the system is enhanced, and the half life is prolonged.
When inorganic salt ions are added and then generate an electric attraction effect with a charged head group of the foaming agent, so that the distribution of active agent molecules on a gas-liquid interface is increased, the density of interface molecules is increased, the overall water holding capacity of a foam liquid film is enhanced, the interference of the diffusion of gas penetrating through the liquid film on the film is reduced, the stability of the foam is increased finally, and the tolerance of the foam is improved. However, after the concentration of the inorganic salt continues to rise, the double-electron layer structure which maintains the stability of the liquid film is compressed, the electrostatic repulsive force is increased, the molecular arrangement on the liquid film is loosened, and the foam stability is deteriorated.
2. The effect of temperature on the viscosity of the foaming liquid was examined with respect to the foaming liquid prepared in example 2, and with respect to the temperature, as shown in FIG. 5, and the effect of temperature on the half life of the foam was examined, as shown in FIG. 6.
The half life of the foam increases with temperature and then decreases, and when the temperature is less than 45 ℃, the half life of the foam increases slightly with increasing temperature. At this time, the association of the hydrophobically associating polymer is enhanced, so that the viscosity of the solution is increased, the half life of the foam is increased, but after the temperature is continuously increased, the gas diffusion effect is enhanced, so that the half life of the foam is reduced, but the reduction range is far lower than that of a system without adding a foam stabilizer.
3. The foaming liquid prepared in example 2 was used for 50s -1 The foaming liquid was continuously sheared for 3min, and thereafter the viscosity of the foaming liquid was measured at a shearing rate of 7.338s-1 every 5min, and the viscosity recovery curve of the foaming liquid was shown in FIG. 7.
Over time, the hydrophobic chains of the hydrophobically associating polymer are able to re-associate intermolecular, again forming a crosslinked network. Under the action of the nano particles, the degree of mechanical degradation of the shearing on the polymer is reduced, and meanwhile, in the process of forming a cross-linked network, the nano particles are adsorbed on the polymer again, so that the viscosity property of the sheared solution is recovered to a certain extent, and the apparent viscosity is greatly recovered, therefore, the stability of the system can be effectively improved by compounding the nano particles and the hydrophobic association polymer.
Claims (9)
1. The preparation method of the temperature-resistant salt-tolerant oil displacement channeling-blocking nano cross-linked gelled foam system is characterized by comprising the following steps of:
(1) Adding inorganic salt into a beaker containing deionized water, and preparing inorganic salt solution containing the same mass fraction according to formation water mineralization data;
(2) Adding an anionic surfactant into the solution of the step (1), and stirring until the anionic surfactant is completely dissolved;
(3) Adding hydrophobically modified nano SiO into the solution of (2) 2 Placing in an ultrasonic cleaner for ultrasonic dispersion for 25-35min;
(4) Adding a polymer foam stabilizer into the solution of the step (3), and stirring until the polymer foam stabilizer is completely dissolved;
(5) Sealing the beaker filled with the solution obtained in the step (4), and aging for 72 hours at the formation temperature to obtain the water-soluble polymer;
the structural formula of the polymer foam stabilizer is as follows:
2. the method for preparing the temperature-resistant salt-tolerant oil displacement channeling-blocking nano cross-linked gelled foam system according to claim 1, wherein in the step (2), a magnetic stirrer is used for stirring, the rotating speed is 300-400r/min, and the stirring time is 25-35min.
3. The method for preparing the temperature-resistant salt-tolerant oil displacement channeling-blocking nano-crosslinked gelled foam system according to claim 1, wherein in the step (3), the ultrasonic dispersion power is 1200W, and the temperature is not higher than 50 ℃.
4. The method for preparing the temperature-resistant salt-tolerant oil displacement channeling-blocking nano cross-linked gelled foam system according to claim 1, wherein in the step (4), a magnetic stirrer is used for stirring, the rotating speed is 300-400r/min, and the stirring time is 150-200min.
5. The preparation method of the temperature-resistant salt-tolerant oil displacement channeling-blocking nano cross-linked gelled foam system according to claim 1, wherein the anionic surfactant is any one or two of sodium dodecyl benzene sulfonate and alpha-olefin sulfonate, and the mass fraction of the anionic surfactant is 0.30% -0.50%.
6. The method for preparing the temperature-resistant salt-tolerant oil displacement channeling-blocking nano-crosslinked gelled foam system according to claim 1, wherein the mass fraction of the hydrophobically associating polymer is 0.15% -0.25%.
7. The method for preparing the temperature-resistant salt-tolerant oil displacement channeling-sealing nano-crosslinked gelled foam system according to claim 1, wherein the hydrophobic modified nano-SiO 2 The mass fraction of (2) is 1% -2%.
8. The preparation method of the temperature-resistant salt-tolerant oil displacement channeling-blocking nano-crosslinked gelled foam system according to claim 1, which is characterized by comprising the following steps of:
(1) DDAAC synthesis
Slowly adding chlorodecane into dimethylamine and sodium hydroxide aqueous solution, stirring while adding, heating after adding, dripping chloroethylene until the reaction is finished, recrystallizing the obtained solution by using ethyl acetate and absolute ethyl alcohol solution, standing for 48H, performing vacuum filtration, and performing vacuum drying at 45 ℃ to obtain DDAAC solid;
(2) Polymer foam stabilizer synthesis
Weighing three monomers of acrylamide, DDAAC and sodium acrylate according to the mass ratio of 7:2:1, and preparing an aqueous solution; introducing nitrogen into the aqueous solution for 20 minutes, adding sodium bisulphite with the mass percent of 0.15% and potassium persulfate with the mass percent of 0.05% as an initiator under the protection of nitrogen, reacting for 12 hours at 60 ℃, and drying, grinding and sieving the obtained product into granular solid to obtain the catalyst.
9. The method for preparing the temperature-resistant salt-tolerant oil displacement channeling-blocking nano-crosslinked gelled foam system according to claim 1, wherein the inorganic salt solution is Na-containing + 、Ca 2+ 、Mg 2+ Any one or more of the inorganic salt solutions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210939453.5A CN117551443A (en) | 2022-08-05 | 2022-08-05 | Preparation method of temperature-resistant salt-tolerant oil displacement channeling-blocking nano-crosslinked gelled foam system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210939453.5A CN117551443A (en) | 2022-08-05 | 2022-08-05 | Preparation method of temperature-resistant salt-tolerant oil displacement channeling-blocking nano-crosslinked gelled foam system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117551443A true CN117551443A (en) | 2024-02-13 |
Family
ID=89815396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210939453.5A Pending CN117551443A (en) | 2022-08-05 | 2022-08-05 | Preparation method of temperature-resistant salt-tolerant oil displacement channeling-blocking nano-crosslinked gelled foam system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117551443A (en) |
-
2022
- 2022-08-05 CN CN202210939453.5A patent/CN117551443A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104449631B (en) | Strong gas wettability nano silicon Xie Shui locks the method for agent, its preparation method and rock surface wettability reversal | |
| CN109401742B (en) | Temperature-resistant salt-tolerant foam profile control and flooding system prepared from high-salinity formation water | |
| CN106947450B (en) | Deep profile control and flooding agent with low initial viscosity and preparation method thereof | |
| CN111040750B (en) | Composite temperature-resistant gel plugging agent, preparation method thereof and application thereof in profile control and water plugging of ultra-deep reservoir | |
| CN112898484B (en) | Oil-gas field plugging-regulating and flooding multifunctional medicament and preparation process thereof | |
| CN102295918B (en) | Natural carboxylate-polymer microballoon binary composite control system, and preparation and application thereof | |
| CN113462375A (en) | Chemical intervention in-situ emulsification system | |
| CN105131173A (en) | Slow-expansion polymer micro-balloon deep oil displacement and profile control agent and preparation method thereof | |
| CN113527576A (en) | Polymer microsphere coated with surfactant and preparation method thereof | |
| CN111234792B (en) | Polymer microsphere water shutoff profile control agent and preparation method thereof | |
| CN117551443A (en) | Preparation method of temperature-resistant salt-tolerant oil displacement channeling-blocking nano-crosslinked gelled foam system | |
| CN115819676A (en) | Self-assembled nano-particles for oil reservoir deep profile control and preparation method and application thereof | |
| CN114854387B (en) | Nano flower-nano sheet dual-inorganic nano profile control and flooding system and application thereof | |
| CN113563506B (en) | In-situ inorganic gel profile control and flooding agent for slowly-released generated reservoir, and preparation method and application thereof | |
| CN114109304A (en) | Temporary plugging agent assisted carbon dioxide huff and puff oil production method | |
| CN110305651B (en) | Nano particle crosslinked polymer oil displacement agent and preparation method and application thereof | |
| CN114621739B (en) | Temperature-resistant salt-resistant super-hydrophobic particle plugging agent and preparation method thereof | |
| CN115058236B (en) | Microbubble self-crosslinking self-adaptive gel deep profile control and flooding system with adjustable gas generating rate and application thereof | |
| CN104788611A (en) | Thickener containing 2-acrylamido-2-methylpropane sulfonic acid and being used for increasing recovery ratio | |
| CN117247771B (en) | Particle composite gel reinforced foam system and preparation method and application thereof | |
| CN114605981B (en) | Hydrophobic association polymer quick solvent based on surfactant and dissolving method | |
| CN115287052B (en) | Carbon point compound oil displacement system based on interface regulation and control and preparation method and application thereof | |
| CN114645690B (en) | Compound profile control and flooding process for gel dispersion | |
| CN110699056A (en) | Steam channeling sealing agent | |
| CN117070205B (en) | Pressure-reducing injection-increasing surfactant and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |