CN114350337B - Intelligent lamellar nano foam stabilizer, preparation method thereof and application thereof in foam flooding - Google Patents
Intelligent lamellar nano foam stabilizer, preparation method thereof and application thereof in foam flooding Download PDFInfo
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- CN114350337B CN114350337B CN202111617897.9A CN202111617897A CN114350337B CN 114350337 B CN114350337 B CN 114350337B CN 202111617897 A CN202111617897 A CN 202111617897A CN 114350337 B CN114350337 B CN 114350337B
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- 239000006260 foam Substances 0.000 title claims abstract description 119
- 239000003381 stabilizer Substances 0.000 title claims abstract description 82
- 239000008208 nanofoam Substances 0.000 title claims abstract description 73
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 239000011259 mixed solution Substances 0.000 claims abstract description 55
- 239000003921 oil Substances 0.000 claims abstract description 40
- 239000003513 alkali Substances 0.000 claims abstract description 28
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 28
- 238000006073 displacement reaction Methods 0.000 claims abstract description 28
- 238000011084 recovery Methods 0.000 claims abstract description 23
- 239000010779 crude oil Substances 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 16
- 239000011148 porous material Substances 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 8
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- 238000001816 cooling Methods 0.000 claims description 10
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- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical group [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 claims description 6
- 238000004581 coalescence Methods 0.000 claims description 6
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- 239000007791 liquid phase Substances 0.000 claims description 6
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- 239000001632 sodium acetate Substances 0.000 claims description 6
- 235000017281 sodium acetate Nutrition 0.000 claims description 6
- 239000000110 cooling liquid Substances 0.000 claims description 2
- 239000001509 sodium citrate Substances 0.000 claims description 2
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- 239000002122 magnetic nanoparticle Substances 0.000 abstract description 4
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- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 14
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 12
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- JDRSMPFHFNXQRB-CMTNHCDUSA-N Decyl beta-D-threo-hexopyranoside Chemical compound CCCCCCCCCCO[C@@H]1O[C@H](CO)C(O)[C@H](O)C1O JDRSMPFHFNXQRB-CMTNHCDUSA-N 0.000 description 2
- 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 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
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- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 description 1
- WHNWPMSKXPGLAX-UHFFFAOYSA-N N-Vinyl-2-pyrrolidone Chemical compound C=CN1CCCC1=O WHNWPMSKXPGLAX-UHFFFAOYSA-N 0.000 description 1
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 229910001870 ammonium persulfate Inorganic materials 0.000 description 1
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- 229920001002 functional polymer Polymers 0.000 description 1
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- QNILTEGFHQSKFF-UHFFFAOYSA-N n-propan-2-ylprop-2-enamide Chemical compound CC(C)NC(=O)C=C QNILTEGFHQSKFF-UHFFFAOYSA-N 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
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- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 1
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- XFTALRAZSCGSKN-UHFFFAOYSA-M sodium;4-ethenylbenzenesulfonate Chemical compound [Na+].[O-]S(=O)(=O)C1=CC=C(C=C)C=C1 XFTALRAZSCGSKN-UHFFFAOYSA-M 0.000 description 1
- DAJSVUQLFFJUSX-UHFFFAOYSA-M sodium;dodecane-1-sulfonate Chemical compound [Na+].CCCCCCCCCCCCS([O-])(=O)=O DAJSVUQLFFJUSX-UHFFFAOYSA-M 0.000 description 1
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- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention discloses an intelligent lamellar nano foam stabilizer, a preparation method thereof and application thereof in foam flooding, wherein the formula comprises the following components: MXene, inorganic matters, an alkali source and a cross-linking agent, and the preparation method comprises the steps of firstly, weighing raw materials; step two, preparing a mixed solution A; step three, preparing a mixed solution B; step four, obtaining a finished product; according to the invention, through in-situ crosslinking on the surface and the interlayer of MXene, magnetic nano particles are deposited and the hydrophilic and hydrophobic properties of the magnetic nano particles are improved, so that the intelligent layered nano foam stabilizer is obtained, has the characteristics of prolonging the service life of foam and the comprehensive properties of foam, thereby prolonging the action time of the foam in the pore throat of a stratum, realizing temporary blocking of large pore canals of the stratum and improving the recovery ratio of crude oil; and after foam breaks down when meeting oil, the recovery and reuse of the intelligent lamellar nano foam stabilizer can be rapidly realized through an external magnetic field, and the method has important significance for improving the oil displacement effect of the foam and further popularizing and applying.
Description
Technical Field
The invention relates to the technical field of tertiary oil recovery chemicals, in particular to an intelligent lamellar nano foam stabilizer, a preparation method thereof and application thereof in foam flooding.
Background
With the rapid increase of the world demand for oil and gas resources, deep oil and gas reservoir resources in a high-temperature geothermal environment gradually become the key point of searching exploitation; the foam has the advantages of small particle size, large specific surface area, good fluidity and the like, and has great application value in tertiary oil recovery of oil and gas resources; the foam reduces the saturation of residual oil in the rock through the advantages of low friction resistance, low density, strong flowback capability and the like, so that the crude oil recovery ratio is improved; however, in the actual foam flooding process, the stability of the foam is poor, the foam is easy to break in a complex oil reservoir environment, the swept volume cannot be enlarged, and the foam flooding efficiency is severely restricted;
the foaming system used in traditional foam flooding mainly comprises a single-component small-molecule surfactant, a single-component polymer surfactant and a multi-component surfactant compound system, and the foaming system has strong foaming capability, but the service life of the formed foam is shorter; the nano particles are used as a novel foam stabilizer to be compounded with a micromolecular surfactant to construct a nano particle/surfactant composite foaming system, and the excellent foam stabilizing capability is shown in the foam forming process; however, the currently adopted nanoparticle foam stabilizer is silicon dioxide with a spherical solid structure, aluminum hydroxide with an irregular solid structure or bentonite with a larger irregular solid structure, has limited surface active sites, needs complex modification and modification, and has poor oil displacement effect; in addition, the nanoparticle foam stabilizer has complicated recovery process after oil displacement, and is difficult to popularize and apply on a large scale in an oil field;
chinese patent document 201711382411.1 discloses a sulfonated residual oil modified bentonite foam stabilizer and a preparation method thereof, wherein the foam stabilizer is obtained by adding bentonite and residual oil into an organic solvent for modification, then removing the organic solvent, and performing sulfonation treatment; although the preparation method is simple, the synthesis process involves toxic organic solvents, and is difficult to popularize and apply on a large scale; in addition, the particle size of bentonite used by the foam stabilizer is 38-75 mu m, so that the pore throat of the stratum is easily blocked and cannot be recovered;
chinese patent document 201810761015.8 discloses a preparation method of an intelligent nano foam oil displacement agent, which is prepared by taking solid nano ferroferric oxide as a core and carrying out polymerization coating on the surface of the core through functional polymers; the total enhanced recovery ratio of crude oil of the intelligent nano foam oil displacement agent can reach 18.2%, and the crude oil can be recycled through an external magnetic field, but polymer coated nano ferroferric oxide is easy to agglomerate, so that the pore throat of a stratum is blocked, and the problems of stratum injury and low recovery rate exist;
chinese patent document 202010174556.8 discloses a polymer modified bentonite foam stabilizer and a preparation method thereof, wherein the foam stabilizer is prepared by firstly intercalating bentonite through a surfactant, expanding the interlayer distance of the bentonite, and then adding a functional monomer for copolymerization; although the foam stabilizer solves the problem that bentonite can be precipitated in foam fluid, the synthesis steps are complicated, the half life of the obtained foam is only about 5min at the highest, the foam is easy to break in a high-temperature oil reservoir environment, and the improvement of the crude oil recovery ratio is difficult to realize;
MXene is a novel two-dimensional material similar to an accordion shape, and has a unique layered structure and an ultra-large specific surface area, and rich active sites are arranged between layers; however, the surface of MXene contains abundant hydroxyl groups, is a two-dimensional material with better hydrophilicity, and cannot play a better role in stabilizing bubbles; modification of MXene has been widely used in the fields of flexible actuators, electromagnetic shielding and the like, but the modification of MXene by loading intelligent nanoparticles and surface hydrophobicity has not been reported as a foam stabilizer for tertiary oil recovery.
Disclosure of Invention
The invention aims to provide an intelligent lamellar nano foam stabilizer, a preparation method thereof and application thereof in foam flooding, so as to solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions: the intelligent lamellar nano foam stabilizer comprises the following components in percentage by weight: the inorganic alkali-free environment-friendly water-based paint comprises the following components in parts by weight: 1 to 10 parts of MXene, 0.1 to 1 part of inorganic matter, 0.01 to 0.1 part of alkali source and 0.01 to 0.1 part of cross-linking agent.
Preferably, the MXene is Ti 3 C 2 MXene、Ti 2 C MXene、Nb 2 C MXene、V 2 C MXene、TiVC MXene、Ti 3 CN MXene、Ti 2 N Mxene、V 2 N MXene、Nb 4 C 3 MXene、V 4 C 3 MXene、TiNbC MXene、Mo 2 Ti 2 C 3 Mxene、Mo 2 TiC 2 MXene、Mo 2 C MXene、Cr 2 C MXene、Ta 2 C MXene、Ta 4 C 3 MXene、W 1.33 C MXene、Mo 1.33 One or more of C MXene and VCrC MXene.
Preferably, the inorganic substance is NiCl 2 、FeCl 3 、CoCl 2 、Ni(NO 3 ) 2 、Fe(NO 3 ) 3 、Co(NO 3 ) 2 One or two of them.
Preferably, the alkali source is sodium acetate or sodium citrate.
Preferably, the cross-linking agent has the structure of
(n＝5-17)。
The preparation method of the intelligent lamellar nano foam stabilizer comprises the following steps of firstly, weighing raw materials; step two, preparing a mixed solution A; step three, preparing a mixed solution B; step four, obtaining a finished product;
in the first step, MXene, inorganic matters, alkali sources and cross-linking agents are respectively weighed according to the formula proportion of the intelligent lamellar nano foam stabilizer for standby;
in the second step, adding the inorganic matters weighed in the first step into a proper amount of deionized water, uniformly dissolving by ultrasonic waves, and then adding the alkali source and the cross-linking agent weighed in the first step, uniformly dissolving by ultrasonic waves to obtain a mixed solution A;
in the third step, the MXene weighed in the first step is taken and added into the mixed solution A prepared in the second step, stirred for 2-4 hours under magnetic stirring, the completely mixed solution is transferred into a high-temperature high-pressure reaction kettle, and the mixture is subjected to airtight reaction for 8-12 hours at 120 ℃ to obtain a mixed solution B;
in the fourth step, the mixed solution B obtained in the third step is added into 100mL of deionized water for ultrasonic dispersion uniformly after separation and washing, then crushed for a period of time by a crusher, and finally separated, washed and dried to obtain the finished product of the intelligent lamellar nano foam stabilizer.
Preferably, in the first step, the volume of deionized water is 100mL.
Preferably, in the fourth step, the breaker is a non-contact ultrasonic cell breaker externally connected with a circulating cooling device, the temperature of the circulating cooling liquid is-20 ℃, and the breaking is carried out for 1-2h with the power of 700-900W.
The intelligent lamellar nano foam stabilizer is applied to foam flooding, can prolong the foam life of a foam flooding system, thereby improving the comprehensive performance of foam, further realizing temporary plugging of large pore canals of a stratum and improving the recovery ratio of crude oil; in addition, the intelligent lamellar nano foam stabilizer is adsorbed on a gas-liquid interface and has irreversibility, so that the surface elasticity of foam is effectively increased, the flow of liquid phase in a liquid film is blocked, the thinning of the liquid film is delayed, the coarsening and coalescence of foam are prevented, the purpose of stabilizing the foam is achieved, the swept volume is enlarged, and the foam oil displacement efficiency is improved.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, through in-situ crosslinking on the surface and the interlayer of MXene, magnetic nano particles are deposited and the hydrophilic and hydrophobic properties of the magnetic nano particles are improved, so that the intelligent layered nano foam stabilizer is obtained, has the characteristics of prolonging the service life of foam and the comprehensive properties of foam, thereby prolonging the action time of the foam in the pore throat of a stratum, realizing temporary blocking of large pore canals of the stratum and improving the recovery ratio of crude oil; and after foam breaks down when meeting oil, the recovery and reuse of the intelligent lamellar nano foam stabilizer can be rapidly realized through an external magnetic field, and the method has important significance for improving the oil displacement effect of the foam and further popularizing and applying.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the present invention provides a technical solution:
example 1:
the intelligent lamellar nano foam stabilizer comprises the following components in percentage by weight: the inorganic alkali-free environment-friendly water-based paint comprises the following components in parts by weight: 1 part of MXene, 0.1 part of inorganic matters, 0.01 part of alkali sources and 0.01 part of crosslinking agents; MXene is Ti 3 C 2 MXene; the inorganic substance is NiCl 2 The method comprises the steps of carrying out a first treatment on the surface of the The alkali source is sodium acetate; the cross-linking agent has the structure that
The preparation method of the intelligent lamellar nano foam stabilizer comprises the following steps of firstly, weighing raw materials; step two, preparing a mixed solution A; step three, preparing a mixed solution B; step four, obtaining a finished product;
in the first step, MXene, inorganic matters, alkali sources and cross-linking agents are respectively weighed according to the formula proportion of the intelligent lamellar nano foam stabilizer for standby;
in the second step, the inorganic matters weighed in the first step are added into 100mL of deionized water, and are dissolved uniformly by ultrasound, and then the alkali source and the cross-linking agent weighed in the first step are added, and are dissolved uniformly by ultrasound, so as to obtain a mixed solution A;
in the third step, ti which is weighed in the first step is taken 3 C 2 MXene is added into the mixed solution A prepared in the step two, stirred for 2 hours under magnetic stirring, the completely mixed solution is transferred into a high-temperature high-pressure reaction kettle, and the mixture is subjected to airtight reaction for 8 hours at 120 ℃ to obtain mixed solution B;
in the fourth step, the mixed solution B obtained in the third step is added into 100mL of deionized water for ultrasonic dispersion uniformly after separation and washing, then a non-contact ultrasonic cell disruption instrument externally connected with a circulating cooling device is adopted, the temperature of the circulating cooling solution is minus 20 ℃, disruption is carried out for 1h with 700W power, and finally the intelligent lamellar nano foam stabilizer finished product is obtained after separation, washing and drying.
The application of the intelligent lamellar nano foam stabilizer in foam flooding can improve the foam life of a foam flooding system, so that the comprehensive performance of the foam is improved, temporary plugging of stratum large pore channels is realized, and the crude oil recovery ratio is improved; in addition, the intelligent lamellar nano foam stabilizer is adsorbed on a gas-liquid interface and has irreversibility, so that the surface elasticity of foam is effectively increased, the flow of liquid phase in a liquid film is blocked, the thinning of the liquid film is delayed, the coarsening and coalescence of foam are prevented, the purpose of stabilizing the foam is achieved, the swept volume is enlarged, and the foam oil displacement efficiency is improved.
The average particle diameter and the surface wettability of the intelligent lamellar nano foam stabilizer are characterized by adopting a laser particle size meter and a contact angle measuring instrument, wherein the average particle diameter is 32nm, and the contact angle is 67.6 degrees; the foaming capacity, the foam stability and the oil displacement efficiency of a foam formula consisting of intelligent lamellar nano foam stabilizer with the concentration of 0.1% and foaming agent decyl glucoside sodium sulfonate with the concentration of 0.4% are evaluated by adopting a Roche foam meter (GBT 13173-2008) and a core displacement device (Q/SY T6424-2014), and the test result is shown in Table 1; and (3) recycling and enriching the intelligent lamellar nano foam stabilizer after foam flooding by adopting an external magnetic field, washing for three times by using a mixed solution of ethanol and acetic acid, and repeating the oil flooding experiment after drying at 100 ℃.
Example 2:
the intelligent lamellar nano foam stabilizer comprises the following components in percentage by weight: the inorganic alkali-free environment-friendly water-based paint comprises the following components in parts by weight: 8 parts of MXene, 1 part of inorganic matter, 0.05 part of alkali source and 0.1 part of cross-linking agent; MXene is Mo 2 Ti 2 C 3 MXene; the inorganic substance is NiCl 2 The method comprises the steps of carrying out a first treatment on the surface of the The alkali source is sodium acetate; the cross-linking agent has the structure that
The preparation method of the intelligent lamellar nano foam stabilizer comprises the following steps of firstly, weighing raw materials; step two, preparing a mixed solution A; step three, preparing a mixed solution B; step four, obtaining a finished product;
in the first step, MXene, inorganic matters, alkali sources and cross-linking agents are respectively weighed according to the formula proportion of the intelligent lamellar nano foam stabilizer for standby;
in the second step, the inorganic matters weighed in the first step are added into 100mL of deionized water, and are dissolved uniformly by ultrasound, and then the alkali source and the cross-linking agent weighed in the first step are added, and are dissolved uniformly by ultrasound, so as to obtain a mixed solution A;
in the third step, mo is taken out from the first step 2 Ti 2 C 3 MXene is added into the mixed solution A prepared in the step two, stirred for 4 hours under magnetic stirring, the completely mixed solution is transferred into a high-temperature high-pressure reaction kettle, and the mixture is subjected to airtight reaction for 12 hours at 120 ℃ to obtain mixed solution B;
in the fourth step, the mixed solution B obtained in the third step is added into 100mL of deionized water for ultrasonic dispersion uniformly after separation and washing, then a non-contact ultrasonic cell disruption instrument externally connected with a circulating cooling device is adopted, the temperature of the circulating cooling solution is minus 20 ℃, disruption is carried out for 2 hours with 900W power, and finally the intelligent lamellar nano foam stabilizer finished product is obtained after separation, washing and drying.
The application of the intelligent lamellar nano foam stabilizer in foam flooding can improve the foam life of a foam flooding system, so that the comprehensive performance of the foam is improved, temporary plugging of stratum large pore channels is realized, and the crude oil recovery ratio is improved; in addition, the intelligent lamellar nano foam stabilizer is adsorbed on a gas-liquid interface and has irreversibility, so that the surface elasticity of foam is effectively increased, the flow of liquid phase in a liquid film is blocked, the thinning of the liquid film is delayed, the coarsening and coalescence of foam are prevented, the purpose of stabilizing the foam is achieved, the swept volume is enlarged, and the foam oil displacement efficiency is improved.
The average particle diameter and the surface wettability of the intelligent lamellar nano foam stabilizer are characterized by adopting a laser particle size meter and a contact angle measuring instrument, wherein the average particle diameter is 41nm, and the contact angle is 65.2 degrees; the foaming capacity, the foam stability and the oil displacement efficiency of a foam formula consisting of an intelligent lamellar nano foam stabilizer with the concentration of 0.1% and a foaming agent sodium dodecyl sulfonate with the concentration of 0.4% are evaluated by adopting a Roche foam meter (GBT 13173-2008) and a core displacement device (Q/SY T6424-2014), and the test result is shown in Table 1; and (3) recycling and enriching the intelligent lamellar nano foam stabilizer after foam flooding by adopting an external magnetic field, washing for three times by using a mixed solution of ethanol and acetic acid, and repeating the oil flooding experiment after drying at 100 ℃.
Example 3:
the intelligent lamellar nano foam stabilizer comprises the following components in percentage by weight: the inorganic alkali-free environment-friendly water-based paint comprises the following components in parts by weight: 5 parts of MXene, 0.2 part of inorganic matters, 0.04 part of alkali source and 0.04 part of crosslinking agent; MXene is W 1.33 C MXene; the inorganic substance is NiCl 2 The method comprises the steps of carrying out a first treatment on the surface of the The alkali source is sodium acetate; the cross-linking agent has the structure that
The preparation method of the intelligent lamellar nano foam stabilizer comprises the following steps of firstly, weighing raw materials; step two, preparing a mixed solution A; step three, preparing a mixed solution B; step four, obtaining a finished product;
in the first step, MXene, inorganic matters, alkali sources and cross-linking agents are respectively weighed according to the formula proportion of the intelligent lamellar nano foam stabilizer for standby;
in the second step, the inorganic matters weighed in the first step are added into 100mL of deionized water, and are dissolved uniformly by ultrasound, and then the alkali source and the cross-linking agent weighed in the first step are added, and are dissolved uniformly by ultrasound, so as to obtain a mixed solution A;
in the third step, the W weighed in the first step is taken 1.33 C, adding the C MXene into the mixed solution A prepared in the step two, stirring for 2 hours under magnetic stirring, transferring the completely mixed solution into a high-temperature high-pressure reaction kettle, and performing airtight reaction for 10 hours at 120 ℃ to obtain a mixed solution B;
in the fourth step, the mixed solution B obtained in the third step is added into 100mL of deionized water for ultrasonic dispersion uniformly after separation and washing, then a non-contact ultrasonic cell disruption instrument externally connected with a circulating cooling device is adopted, the temperature of the circulating cooling solution is minus 20 ℃, disruption is carried out for 1h with 800W power, and finally the intelligent lamellar nano foam stabilizer finished product is obtained after separation, washing and drying.
The application of the intelligent lamellar nano foam stabilizer in foam flooding can improve the foam life of a foam flooding system, so that the comprehensive performance of the foam is improved, temporary plugging of stratum large pore channels is realized, and the crude oil recovery ratio is improved; in addition, the intelligent lamellar nano foam stabilizer is adsorbed on a gas-liquid interface and has irreversibility, so that the surface elasticity of foam is effectively increased, the flow of liquid phase in a liquid film is blocked, the thinning of the liquid film is delayed, the coarsening and coalescence of foam are prevented, the purpose of stabilizing the foam is achieved, the swept volume is enlarged, and the foam oil displacement efficiency is improved.
The average particle diameter and the surface wettability of the intelligent lamellar nano foam stabilizer are characterized by adopting a laser particle size meter and a contact angle measuring instrument, wherein the average particle diameter is 45nm, and the contact angle is 70.4 degrees; the foaming capacity, the foam stability and the oil displacement efficiency of a foam formula consisting of an intelligent lamellar nano foam stabilizer with the concentration of 0.2% and a foaming agent dodecyl hydroxypropyl sulfobetaine with the concentration of 0.4% are evaluated by adopting a Roche foam instrument (GBT 13173-2008) and a core displacement device (Q/SY T6424-2014), and the test result is shown in Table 1; and (3) recycling and enriching the intelligent lamellar nano foam stabilizer after foam flooding by adopting an external magnetic field, washing for three times by using a mixed solution of ethanol and acetic acid, and repeating the oil flooding experiment after drying at 100 ℃.
Example 4:
the intelligent lamellar nano foam stabilizer comprises the following components in percentage by weight: the inorganic alkali-free environment-friendly water-based paint comprises the following components in parts by weight: 10 parts of MXene, 0.4 part of inorganic matters, 0.1 part of alkali source and 0.06 part of crosslinking agent; MXene is VCrC MXene; the inorganic substance is NiCl 2 The method comprises the steps of carrying out a first treatment on the surface of the The alkali source is sodium acetate; the cross-linking agent has the structure that
The preparation method of the intelligent lamellar nano foam stabilizer comprises the following steps of firstly, weighing raw materials; step two, preparing a mixed solution A; step three, preparing a mixed solution B; step four, obtaining a finished product;
in the first step, MXene, inorganic matters, alkali sources and cross-linking agents are respectively weighed according to the formula proportion of the intelligent lamellar nano foam stabilizer for standby;
in the second step, the inorganic matters weighed in the first step are added into 100mL of deionized water, and are dissolved uniformly by ultrasound, and then the alkali source and the cross-linking agent weighed in the first step are added, and are dissolved uniformly by ultrasound, so as to obtain a mixed solution A;
in the third step, VCrC MXene weighed in the first step is taken and added into the mixed solution A prepared in the second step, stirred for 3 hours under magnetic stirring, and the completely mixed solution is transferred into a high-temperature high-pressure reaction kettle and subjected to airtight reaction for 12 hours at 120 ℃ to obtain a mixed solution B;
in the fourth step, the mixed solution B obtained in the third step is added into 100mL of deionized water for ultrasonic dispersion uniformly after separation and washing, then a non-contact ultrasonic cell disruption instrument externally connected with a circulating cooling device is adopted, the temperature of the circulating cooling solution is minus 20 ℃, disruption is carried out for 2 hours with 900W power, and finally the intelligent lamellar nano foam stabilizer finished product is obtained after separation, washing and drying.
The application of the intelligent lamellar nano foam stabilizer in foam flooding can improve the foam life of a foam flooding system, so that the comprehensive performance of the foam is improved, temporary plugging of stratum large pore channels is realized, and the crude oil recovery ratio is improved; in addition, the intelligent lamellar nano foam stabilizer is adsorbed on a gas-liquid interface and has irreversibility, so that the surface elasticity of foam is effectively increased, the flow of liquid phase in a liquid film is blocked, the thinning of the liquid film is delayed, the coarsening and coalescence of foam are prevented, the purpose of stabilizing the foam is achieved, the swept volume is enlarged, and the foam oil displacement efficiency is improved.
The average particle diameter and the surface wettability of the intelligent lamellar nano foam stabilizer are characterized by adopting a laser particle size meter and a contact angle measuring instrument, wherein the average particle diameter is 35nm, and the contact angle is 69.7 degrees; the foaming capacity, the foam stability and the oil displacement efficiency of a foam formula consisting of an intelligent lamellar nano foam stabilizer with the concentration of 0.2% and a foaming agent alpha-sodium alkenyl sulfonate with the concentration of 0.4% are evaluated by adopting a Roche foam meter (GBT 13173-2008) and a core displacement device (Q/SY T6424-2014), and the test result is shown in Table 1; and (3) recycling and enriching the intelligent lamellar nano foam stabilizer after foam flooding by adopting an external magnetic field, washing for three times by using a mixed solution of ethanol and acetic acid, and repeating the oil flooding experiment after drying at 100 ℃.
Comparative example 1:
a macromolecule modified bentonite foam stabilizer and a preparation method thereof (Chinese patent 202010174556.8) comprise the following steps:
mixing hexadecyl trimethyl ammonium bromide and bentonite in a mass ratio of 2:5 at 70 ℃ for 2 hours, and then carrying out suction filtration, drying, crushing and sieving to obtain organic modified bentonite; dissolving 2-acrylamido-2-methylpropanesulfonic acid, acrylamide and N-vinyl pyrrolidone in a mass ratio of 10:3:2 in water to prepare a solution with a monomer concentration of 10%, regulating the pH to 4 by using 0.1mol/L sodium hydroxide, then adding organic modified bentonite, uniformly stirring, moistening nitrogen for 20min, adding ammonium persulfate with a mass of 0.1% of the monomer, continuously introducing nitrogen for 2min, sealing the reactor, reacting at 40 ℃ for 3h, and drying and crushing to obtain the polymer modified bentonite foam stabilizer; the foam formulation foaming capacity and foam stability of the foaming agent decyl glucoside sodium sulfonate (FP 1856) with the concentration of 0.4% and the polymer modified bentonite particle foam stabilizer with the concentration of 1% are evaluated by adopting a Wu Yin stirring method in an experiment; the test results are shown in Table 1.
Comparative example 2:
the preparation method (201810761015.8) of the intelligent nano foam oil displacement agent comprises the following steps:
dispersing 0.1g of nano ferroferric oxide in 200mL of deionized water, adding 1g of polyvinylpyrrolidone, purging with nitrogen for 30min, adding 1g of N-isopropyl acrylamide, 0.1g of potassium persulfate and 0.05g of sodium p-styrenesulfonate at one time, heating to 80 ℃ for reaction for 12h, centrifuging and drying to obtain nano particles; dispersing the obtained nano particles and 1g of sodium dodecyl sulfate in water to obtain an intelligent nano foam oil displacement agent, and researching the oil displacement performance of the intelligent nano foam oil displacement agent by adopting a core displacement experiment; crude oil recovery is evaluated according to Q/SY T6424-2014 composite oil displacement system performance test method; the test results are shown in Table 1.
TABLE 1 Performance test Condition data sheet for different foam stabilizers and foam oil-displacing agents
Based on the above, as can be seen from table 1, the foaming agent used in example 1 was the same as that in comparative example 1 in that the foaming volume was not different, but the half life of the foam was significantly increased from 5.0min to 12.3min, and the foam comprehensive evaluation index was increased from 3650ml·min to 8979ml·min, indicating that the foam stabilizer in example 1 had excellent foam stabilizing performance; the foaming agents of example 2, example 3 and example 4 are different from the foaming agent used in comparative example 1, and the foam volume is smaller than that of comparative example 1, but the foam half-life of example 2, example 3 and example 4 is significantly larger than that of comparative example 1, and the foam comprehensive evaluation index is significantly larger than that of comparative example 1; thus, the intelligent lamellar nano foam stabilizers in example 1, example 2, example 3 and example 4 have higher foam stabilizing capability; there is no data on foam volume and half life in comparative example 2, with 18.2% total enhanced recovery for crude oil, while examples 1, 2, 3 and 4 showed 21.9%, 20.1%, 20.5% and 21.0% total enhanced recovery for crude oil, respectively, with better displacement performance than comparative example 2; the total enhanced recovery ratio of the crude oil after the intelligent lamellar nano foam stabilizer in the embodiment 1, the embodiment 2, the embodiment 3 and the embodiment 4 is washed and oil-displaced again after recovery is 21.5%, 19.0%, 19.3% and 20.0%, respectively, which shows that the intelligent lamellar nano foam stabilizer has good repeated use performance in foam oil displacement.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (6)
1. The intelligent lamellar nano foam stabilizer comprises the following components in percentage by weight: MXene, inorganic matter, alkali source and cross-linking agent, characterized by: the weight portions of the components are as follows: 1 to 10 parts of MXene, 0.1 to 1 part of inorganic matter, 0.01 to 0.1 part of alkali source and 0.01 to 0.1 part of cross-linking agent;
the inorganic substance is NiCl 2 、FeCl 3 、CoCl 2 、Ni(NO 3 ) 2 、Fe(NO 3 ) 3 、Co(NO 3 ) 2 One or two of the following components;
the alkali source is sodium acetate or sodium citrate;
the structure of the cross-linking agent is as follows:
the preparation method of the intelligent lamellar nano foam stabilizer comprises the following steps of firstly, weighing raw materials; step two, preparing a mixed solution A; step three, preparing a mixed solution B; step four, obtaining a finished product; the method is characterized in that:
in the first step, MXene, inorganic matters, alkali sources and cross-linking agents are respectively weighed according to the formula proportion of the intelligent lamellar nano foam stabilizer for standby;
in the second step, adding the inorganic matters weighed in the first step into a proper amount of deionized water, uniformly dissolving by ultrasonic waves, and then adding the alkali source and the cross-linking agent weighed in the first step, uniformly dissolving by ultrasonic waves to obtain a mixed solution A;
in the third step, the MXene weighed in the first step is taken and added into the mixed solution A prepared in the second step, stirred for 2-4 hours under magnetic stirring, the completely mixed solution is transferred into a high-temperature high-pressure reaction kettle, and the mixture is subjected to airtight reaction for 8-12 hours at 120 ℃ to obtain a mixed solution B;
in the fourth step, the mixed solution B obtained in the third step is added into 100mL of deionized water for ultrasonic dispersion uniformly after separation and washing, then crushed for a period of time by a crusher, and finally separated, washed and dried to obtain the finished product of the intelligent lamellar nano foam stabilizer.
2. The intelligent lamellar nano foam stabilizer according to claim 1, characterized in that: the MXene is Ti 3 C 2 MXene、Ti 2 C MXene、Nb 2 C MXene、V 2 C MXene、TiVC MXene、Ti 3 CN MXene、Ti 2 N Mxene、V 2 N MXene、Nb 4 C 3 MXene、V 4 C 3 MXene、TiNbC MXene、Mo 2 Ti 2 C 3 Mxene、Mo 2 TiC 2 MXene、Mo 2 C MXene、Cr 2 C MXene、Ta 2 C MXene、Ta 4 C 3 MXene、W 1.33 C MXene、Mo 1.33 One or more of C MXene and VCrC MXene.
3. The preparation method of the intelligent lamellar nano foam stabilizer according to claim 1, comprising the following steps of firstly, weighing raw materials; step two, preparing a mixed solution A; step three, preparing a mixed solution B; step four, obtaining a finished product; the method is characterized in that:
in the first step, MXene, inorganic matters, alkali sources and cross-linking agents are respectively weighed according to the formula proportion of the intelligent lamellar nano foam stabilizer for standby;
in the second step, adding the inorganic matters weighed in the first step into a proper amount of deionized water, uniformly dissolving by ultrasonic waves, and then adding the alkali source and the cross-linking agent weighed in the first step, uniformly dissolving by ultrasonic waves to obtain a mixed solution A;
in the third step, the MXene weighed in the first step is taken and added into the mixed solution A prepared in the second step, stirred for 2-4 hours under magnetic stirring, the completely mixed solution is transferred into a high-temperature high-pressure reaction kettle, and the mixture is subjected to airtight reaction for 8-12 hours at 120 ℃ to obtain a mixed solution B;
in the fourth step, the mixed solution B obtained in the third step is added into 100mL of deionized water for ultrasonic dispersion uniformly after separation and washing, then crushed for a period of time by a crusher, and finally separated, washed and dried to obtain the finished product of the intelligent lamellar nano foam stabilizer.
4. The method for preparing the intelligent lamellar nano foam stabilizer according to claim 3, which is characterized in that: in the first step, the volume of deionized water is 100mL.
5. The method for preparing the intelligent lamellar nano foam stabilizer according to claim 3, which is characterized in that: in the fourth step, the breaker is a non-contact ultrasonic cell breaker externally connected with a circulating cooling device, the temperature of the circulating cooling liquid is-20 ℃, and the breaker is broken for 1-2h with the power of 700-900W.
6. The use of the intelligent lamellar nano foam stabilizer according to any one of claims 1-2 or the intelligent lamellar nano foam stabilizer prepared by the preparation method according to any one of claims 3-5 in foam flooding, characterized in that: the intelligent lamellar nano foam stabilizer is applied to foam flooding, and can prolong the foam life of a foam flooding system, so that the comprehensive performance of foam is improved, temporary plugging of stratum large pore canals is realized, and the crude oil recovery ratio is improved; in addition, the intelligent lamellar nano foam stabilizer is adsorbed on a gas-liquid interface and has irreversibility, so that the surface elasticity of foam is effectively increased, the flow of liquid phase in a liquid film is blocked, the thinning of the liquid film is delayed, the coarsening and coalescence of foam are prevented, the purpose of stabilizing the foam is achieved, the swept volume is enlarged, and the foam oil displacement efficiency is improved.
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