CN114350337A - Intelligent layered nano foam stabilizer, preparation method thereof and application thereof in foam flooding - Google Patents
Intelligent layered nano foam stabilizer, preparation method thereof and application thereof in foam flooding Download PDFInfo
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Abstract
The invention discloses an intelligent layered nano foam stabilizer, a preparation method thereof and application thereof in foam flooding, wherein the formula comprises the following components: MXene, inorganic substances, an alkali source and a cross-linking agent, and the preparation method comprises the steps of firstly, weighing the 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, the surface and interlayer of MXene are subjected to in-situ crosslinking, magnetic nanoparticles are deposited, and the hydrophilic and hydrophobic properties of the magnetic nanoparticles are improved, so that the intelligent layered nano foam stabilizer is obtained, and has the characteristics of prolonging the service life of foam and improving the comprehensive performance of the foam, so that the action time of the foam in the pore throat of a stratum is prolonged, the temporary blocking of large pores of the stratum is realized, and the crude oil recovery rate is improved; and when the foam is broken off when meeting oil, the intelligent layered nano foam stabilizer can be rapidly recycled and reused through the external magnetic field, and the foam flooding agent has important significance for improving the foam flooding effect 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 layered nano foam stabilizer, a preparation method thereof and application thereof in foam flooding.
Background
With the rapid increase of the demand of various countries in the world on oil and gas resources, deep oil and gas reservoir resources in a high-temperature geothermal environment gradually become the key point for exploration and exploitation; the foam has the advantages of small particle size, large specific surface area, good fluidity and the like, and shows great application value in tertiary exploitation of oil and gas resources; the foam reduces the saturation of residual oil in the rock by the advantages of low friction resistance, low density, strong flowback capability and the like, thereby improving the crude oil recovery ratio; in the actual foam flooding process, the stability of foam is poor, the defect of easy destruction exists in a complex oil reservoir environment, the swept volume cannot be enlarged, and the foam flooding efficiency is severely restricted;
the foaming system used by the traditional foam flooding mainly comprises a single-component small molecular surfactant, a single-component polymer surfactant and a multi-component surfactant compound system, and although the foaming capacity of the foaming system is strong, the service life of the formed foam is short; the nano particles are used as a novel foam stabilizer and are compounded with the 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 used nanoparticle foam stabilizers are all silica with a spherical solid structure, aluminum hydroxide with an irregular solid structure or bentonite with a larger size and an irregular solid structure, and have limited surface active sites, complex modification and poor oil displacement effect; in addition, the recovery process of the nano-particle foam stabilizer after oil displacement is complicated, and large-scale popularization and application on oil fields are difficult;
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 carrying out sulfonation treatment; although the preparation method is simple, the synthesis process involves toxic organic solvents, and large-scale popularization and application are difficult; in addition, the particle size of the bentonite used by the foam stabilizer is 38-75 μm, which is easy to block the pore throat of the stratum and cannot be recycled;
chinese patent document 201810761015.8 discloses a method for preparing an intelligent nano-foam oil-displacing agent, which is obtained by taking solid nano-ferroferric oxide as a core and polymerizing and coating functional polymers on the surface of the core; although the total crude oil enhanced recovery rate of the intelligent nano foam oil displacement agent can reach 18.2 percent and can be recycled through an external magnetic field, polymer-coated nano ferroferric oxide is easy to agglomerate to block the pore throat of a stratum, and the problems of stratum damage and low recovery rate exist;
chinese patent document 202010174556.8 discloses a high molecular modified bentonite foam stabilizer and a preparation method thereof, wherein the foam stabilizer is prepared by firstly intercalating bentonite with a surfactant to enlarge the interlayer spacing 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 period of the obtained foam is only about 5min at most, the foam is easy to break under the high-temperature oil reservoir environment, and the crude oil recovery rate is difficult to improve;
MXene is a novel two-dimensional material similar to an accordion shape, has a unique layered structure and an ultra-large specific surface area, and has rich active sites between layers; however, the MXene surface contains abundant hydroxyl groups, is a two-dimensional material with good hydrophilicity, and cannot play a good foam stabilizing effect; MXene is modified and widely applied to the fields of flexible actuators, electromagnetic shielding and the like, but MXene is loaded with intelligent nanoparticles and subjected to surface hydrophobic modification to be used as a foam stabilizer for tertiary oil recovery has not been reported.
Disclosure of Invention
The invention aims to provide an intelligent layered 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 purpose, the invention provides the following technical scheme: the intelligent layered nano foam stabilizer comprises the following components in percentage by weight: MXene, inorganic matter, alkali source and cross-linking agent, the weight parts of each component are as follows: 1-10 parts of MXene, 0.1-1 part of inorganic substance, 0.01-0.1 part of alkali source and 0.01-0.1 part of cross-linking agent.
Preferably, MXene is Ti3C2 MXene、Ti2C MXene、Nb2C MXene、V2C MXene、TiVC MXene、Ti3CN MXene、Ti2N Mxene、V2N MXene、Nb4C3 MXene、V4C3 MXene、TiNbC MXene、Mo2Ti2C3 Mxene、Mo2TiC2 MXene、Mo2C MXene、Cr2C MXene、Ta2C MXene、Ta4C3 MXene、W1.33C MXene、Mo1.33C MXene、VCrCOne or more of MXene.
Preferably, the inorganic substance is NiCl2、FeCl3、CoCl2、Ni(NO3)2、Fe(NO3)3、Co(NO3)2One or two of them.
Preferably, the alkali source is sodium acetate or sodium citrate.
Preferably, the crosslinking agent has the structure
(n＝5-17)。
The preparation method of the intelligent layered nano foam stabilizer comprises the following steps of 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 substances, an alkali source and a cross-linking agent are respectively weighed according to the formula proportion of the intelligent layered nano foam stabilizer for later use;
in the second step, the inorganic matters weighed in the first step are added into a proper amount of deionized water, and are uniformly dissolved by ultrasonic waves, and then the alkali source and the cross-linking agent weighed in the first step are added, and are uniformly dissolved by ultrasonic waves, so that a mixed solution A is obtained;
adding MXene weighed in the step one into the mixed solution A prepared in the step two in the step three, stirring for 2-4 hours under magnetic stirring, transferring the completely mixed solution into a high-temperature high-pressure reaction kettle, and carrying out closed 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 separated and washed, then added into 100mL deionized water for uniform ultrasonic dispersion, then crushed for a period of time by a crusher, and finally separated, washed and dried to obtain the finished product of the intelligent layered nano foam stabilizer.
Preferably, in the first step, the volume of the deionized water is 100 mL.
Preferably, in the fourth step, the disruptor is a non-contact ultrasonic cell disruptor externally connected with a circulating cooling device, the temperature of the circulating cooling liquid is-20 ℃, and the disruption is carried out for 1-2h with the power of 700-.
The intelligent layered 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, the temporary plugging of large pores in a stratum is realized, and the crude oil recovery rate is improved; in addition, the intelligent layered 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 a liquid phase in a liquid film is hindered, the thinning of the liquid film is delayed, the coarsening and coalescence of the foam are prevented, and the aim of stabilizing the foam is fulfilled, so that the swept volume is enlarged, and the foam flooding efficiency is improved.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, the surface and interlayer of MXene are subjected to in-situ crosslinking, magnetic nanoparticles are deposited, and the hydrophilic and hydrophobic properties of the magnetic nanoparticles are improved, so that the intelligent layered nano foam stabilizer is obtained, and has the characteristics of prolonging the service life of foam and improving the comprehensive performance of the foam, so that the action time of the foam in the pore throat of a stratum is prolonged, the temporary blocking of large pores of the stratum is realized, and the crude oil recovery rate is improved; and when the foam is broken off when meeting oil, the intelligent layered nano foam stabilizer can be rapidly recycled and reused through the external magnetic field, and the foam flooding agent has important significance for improving the foam flooding effect and further popularizing and applying.
Drawings
FIG. 1 is a flow chart of a method of the present invention;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a technical solution provided by the present invention:
example 1:
the intelligent layered nano foam stabilizer comprises the following components in percentage by weight: MXene, inorganic matter, alkali source and cross-linking agent, the weight parts of each component are as follows: 1 part of MXene, 0.1 part of inorganic matter, 0.01 part of alkali source and 0.01 part of crosslinking agent; MXene is Ti3C2MXene; the inorganic substance is NiCl2(ii) a The alkali source is sodium acetate; the structure of the cross-linking agent is
The preparation method of the intelligent layered nano foam stabilizer comprises the following steps of 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 substances, an alkali source and a cross-linking agent are respectively weighed according to the formula proportion of the intelligent layered nano foam stabilizer for later use;
in the second step, the inorganic substance weighed in the first step is added into 100mL of deionized water, and is dissolved uniformly by ultrasonic waves, and then the alkali source and the cross-linking agent weighed in the first step are added, and are dissolved uniformly by ultrasonic waves, so that a mixed solution A is obtained;
wherein in the third step, the Ti weighed in the first step is taken3C2MXene is added into the mixed solution A prepared in the second step, the mixed solution is stirred for 2 hours under magnetic stirring, the completely mixed solution is transferred into a high-temperature high-pressure reaction kettle, and the sealed reaction is carried out for 8 hours at 120 ℃ to obtain mixed solution B;
in the fourth step, the mixed solution B obtained in the third step is separated and washed, then added into 100mL of deionized water for uniform ultrasonic dispersion, then a non-contact ultrasonic cell crusher externally connected with a circulating cooling device is adopted, the temperature of circulating cooling liquid is-20 ℃, crushing is carried out for 1h with the power of 700W, and finally, a finished product of the intelligent layered nano foam stabilizer is obtained after separation, washing and drying.
The intelligent layered nano foam stabilizer is applied to foam flooding, so that the foam life of a foam flooding system can be prolonged, the comprehensive performance of foam is improved, the temporary plugging of large pores of a stratum is realized, and the crude oil recovery rate is improved; in addition, the intelligent layered 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 a liquid phase in a liquid film is hindered, the thinning of the liquid film is delayed, the coarsening and coalescence of the foam are prevented, and the aim of stabilizing the foam is fulfilled, so that the swept volume is enlarged, and the foam flooding efficiency is improved.
The average particle size and the surface wettability of the intelligent layered nano foam stabilizer are represented by a laser particle size analyzer and a contact angle measuring instrument, wherein the average particle size is 32nm, and the contact angle is 67.6 degrees; a Roche foam meter (GBT13173-2008) and a rock core displacement device (Q/SY T6424-2014) are adopted to evaluate the foaming capacity, the foam stability and the oil displacement efficiency of a foam formula consisting of an intelligent layered nano foam stabilizer with the concentration of 0.1% and a foaming agent sodium decyl glucoside sulfonate with the concentration of 0.4%, and the test results are shown in Table 1; and (3) recovering and enriching the intelligent layered 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 flooding experiment after drying at 100 ℃.
Example 2:
the intelligent layered nano foam stabilizer comprises the following components in percentage by weight: MXene, inorganic matter, alkali source and cross-linking agent, the weight parts of each component are as follows: 8 parts of MXene, 1 part of inorganic matter, 0.05 part of alkali source and 0.1 part of crosslinking agent; MXene is Mo2Ti2C3MXene; the inorganic substance is NiCl2(ii) a The alkali source is sodium acetate; the structure of the cross-linking agent is
The preparation method of the intelligent layered nano foam stabilizer comprises the following steps of 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 substances, an alkali source and a cross-linking agent are respectively weighed according to the formula proportion of the intelligent layered nano foam stabilizer for later use;
in the second step, the inorganic substance weighed in the first step is added into 100mL of deionized water, and is dissolved uniformly by ultrasonic waves, and then the alkali source and the cross-linking agent weighed in the first step are added, and are dissolved uniformly by ultrasonic waves, so that a mixed solution A is obtained;
wherein in the third step, the Mo weighed in the first step is taken2Ti2C3MXene is added into the mixed solution A prepared in the second step, the mixed solution is stirred for 4 hours under magnetic stirring, the completely mixed solution is transferred into a high-temperature high-pressure reaction kettle, and the sealed reaction is carried out for 12 hours at 120 ℃ to obtain mixed solution B;
in the fourth step, the mixed solution B obtained in the third step is separated and washed, then added into 100mL of deionized water for uniform ultrasonic dispersion, then a non-contact ultrasonic cell crusher externally connected with a circulating cooling device is adopted, the temperature of circulating cooling liquid is-20 ℃, crushing is carried out for 2h at the power of 900W, and finally, a finished product of the intelligent layered nano foam stabilizer is obtained after separation, washing and drying.
The intelligent layered nano foam stabilizer is applied to foam flooding, so that the foam life of a foam flooding system can be prolonged, the comprehensive performance of foam is improved, the temporary plugging of large pores of a stratum is realized, and the crude oil recovery rate is improved; in addition, the intelligent layered 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 a liquid phase in a liquid film is hindered, the thinning of the liquid film is delayed, the coarsening and coalescence of the foam are prevented, and the aim of stabilizing the foam is fulfilled, so that the swept volume is enlarged, and the foam flooding efficiency is improved.
The average particle size and the surface wettability of the intelligent layered nano foam stabilizer are represented by a laser particle size analyzer and a contact angle measuring instrument, wherein the average particle size is 41nm, and the contact angle is 65.2 degrees; a Roche foam instrument (GBT13173-2008) and a rock core displacement device (Q/SY T6424-2014) are adopted to evaluate the foaming capacity, the foam stability and the oil displacement efficiency of a foam formula consisting of an intelligent layered nano foam stabilizer with the concentration of 0.1% and a foaming agent sodium dodecyl sulfate with the concentration of 0.4%, and the test results are shown in Table 1; and (3) recovering and enriching the intelligent layered 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 flooding experiment after drying at 100 ℃.
Example 3:
the intelligent layered nano foam stabilizer comprises the following components in percentage by weight: MXene, inorganic matter, alkali source and cross-linking agent, the weight parts of each component are as follows: 5 parts of MXene, 0.2 parts of inorganic substance, 0.04 parts of alkali source and 0.04 parts of crosslinking agent; MXene is W1.33C MXene; the inorganic substance is NiCl2(ii) a The alkali source is sodium acetate; the structure of the cross-linking agent is
The preparation method of the intelligent layered nano foam stabilizer comprises the following steps of 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 substances, an alkali source and a cross-linking agent are respectively weighed according to the formula proportion of the intelligent layered nano foam stabilizer for later use;
in the second step, the inorganic substance weighed in the first step is added into 100mL of deionized water, and is dissolved uniformly by ultrasonic waves, and then the alkali source and the cross-linking agent weighed in the first step are added, and are dissolved uniformly by ultrasonic waves, so that a mixed solution A is obtained;
wherein in the third step, the W weighed in the first step is taken1.33Adding MXene into the mixed solution A prepared in the second step, stirring for 2 hours under magnetic stirring, transferring the completely mixed solution into a high-temperature high-pressure reaction kettle, and carrying out closed 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 separated and washed, then added into 100mL of deionized water for uniform ultrasonic dispersion, then a non-contact ultrasonic cell crusher externally connected with a circulating cooling device is adopted, the temperature of circulating cooling liquid is-20 ℃, crushing is carried out for 1h with the power of 800W, and finally, the finished product of the intelligent layered nano foam stabilizer is obtained after separation, washing and drying.
The intelligent layered nano foam stabilizer is applied to foam flooding, so that the foam life of a foam flooding system can be prolonged, the comprehensive performance of foam is improved, the temporary plugging of large pores of a stratum is realized, and the crude oil recovery rate is improved; in addition, the intelligent layered 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 a liquid phase in a liquid film is hindered, the thinning of the liquid film is delayed, the coarsening and coalescence of the foam are prevented, and the aim of stabilizing the foam is fulfilled, so that the swept volume is enlarged, and the foam flooding efficiency is improved.
The average particle size and the surface wettability of the intelligent layered nano foam stabilizer are represented by a laser particle size analyzer and a contact angle measuring instrument, wherein the average particle size is 45nm, and the contact angle is 70.4 degrees; a Roche foam meter (GBT13173-2008) and a rock core displacement device (Q/SY T6424-2014) are adopted to evaluate the foaming capacity, the foam stability and the oil displacement efficiency of a foam formula consisting of an intelligent layered nano foam stabilizer with the concentration of 0.2% and a foaming agent of dodecyl hydroxypropyl sulfobetaine with the concentration of 0.4%, and the test results are shown in Table 1; and (3) recovering and enriching the intelligent layered 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 flooding experiment after drying at 100 ℃.
Example 4:
the intelligent layered nano foam stabilizer comprises the following components in percentage by weight: MXene, inorganic matter, alkali source and cross-linking agent, the weight parts of each component are as follows: 10 parts of MXene, 0.4 parts of inorganic substance, 0.1 part of alkali source and 0.06 part of crosslinking agent; MXene is VCrC MXene; the inorganic substance is NiCl2(ii) a The alkali source is sodium acetate; the structure of the cross-linking agent is
The preparation method of the intelligent layered nano foam stabilizer comprises the following steps of 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 substances, an alkali source and a cross-linking agent are respectively weighed according to the formula proportion of the intelligent layered nano foam stabilizer for later use;
in the second step, the inorganic substance weighed in the first step is added into 100mL of deionized water, and is dissolved uniformly by ultrasonic waves, and then the alkali source and the cross-linking agent weighed in the first step are added, and are dissolved uniformly by ultrasonic waves, so that a mixed solution A is obtained;
in the third step, the VCrC MXene weighed in the first step is added into the mixed solution A prepared in the second step, the mixture is stirred for 3 hours under magnetic stirring, the completely mixed solution is transferred into a high-temperature high-pressure reaction kettle, and the mixture is subjected to closed 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 separated and washed, then added into 100mL of deionized water for uniform ultrasonic dispersion, then a non-contact ultrasonic cell crusher externally connected with a circulating cooling device is adopted, the temperature of circulating cooling liquid is-20 ℃, crushing is carried out for 2h at the power of 900W, and finally, a finished product of the intelligent layered nano foam stabilizer is obtained after separation, washing and drying.
The intelligent layered nano foam stabilizer is applied to foam flooding, so that the foam life of a foam flooding system can be prolonged, the comprehensive performance of foam is improved, the temporary plugging of large pores of a stratum is realized, and the crude oil recovery rate is improved; in addition, the intelligent layered 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 a liquid phase in a liquid film is hindered, the thinning of the liquid film is delayed, the coarsening and coalescence of the foam are prevented, and the aim of stabilizing the foam is fulfilled, so that the swept volume is enlarged, and the foam flooding efficiency is improved.
The average particle size and the surface wettability of the intelligent layered nano foam stabilizer are represented by a laser particle size analyzer and a contact angle measuring instrument, wherein the average particle size is 35nm, and the contact angle is 69.7 degrees; a Roche foam meter (GBT13173-2008) and a rock core displacement device (Q/SY T6424-2014) are adopted to evaluate the foaming capacity, the foam stability and the oil displacement efficiency of a foam formula consisting of 0.2% of intelligent layered nano foam stabilizer and 0.4% of foaming agent alpha-sodium alkenyl sulfonate, and the test results are shown in Table 1; and (3) recovering and enriching the intelligent layered 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 flooding experiment after drying at 100 ℃.
Comparative example 1:
a high molecular modified bentonite foam stabilizer and a preparation method thereof (Chinese patent 202010174556.8) comprise the following steps:
stirring and mixing cetyl trimethyl ammonium bromide and bentonite at 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-acrylamide-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%, adjusting the pH to 4 by using 0.1mol/L sodium hydroxide, then adding organic modified bentonite, uniformly stirring, introducing nitrogen for 20min, adding ammonium persulfate accounting for 0.1% of the mass of the monomer, continuously introducing the nitrogen for 2min, sealing the reactor, reacting at 40 ℃ for 3h, drying and crushing to obtain a high-molecular modified bentonite foam stabilizer; the experiment adopts a Wu Yin stirring method to evaluate the foaming capacity and the foam stability of a foam formula consisting of a foaming agent decyl glucoside sodium sulfonate (FP1856) with the concentration of 0.4 percent and a macromolecular modified bentonite particle foam stabilizer with the concentration of 1 percent; the test results are shown in Table 1.
Comparative example 2:
a preparation method (201810761015.8) of an 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-isopropylacrylamide, 0.1g of potassium persulfate and 0.05g of sodium p-styrenesulfonate once, heating to 80 ℃, reacting for 12h, centrifuging, and drying to obtain nano particles; dispersing the obtained nano particles and 1g of sodium dodecyl sulfate in water together 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 rock core displacement experiment; evaluating the crude oil recovery ratio according to Q/SY T6424-2014 composite oil displacement system performance test method; the test results are shown in Table 1.
TABLE 1 data sheet of performance test conditions of 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 has no difference in foaming volume as in comparative example 1, but the foam half-life period is significantly increased from 5.0min to 12.3min, and the foam comprehensive evaluation index is increased from 3650mL · min to 8979mL · min, which indicates that the foaming agent in example 1 has excellent foam stabilizing performance; the foaming agents in example 2, example 3 and example 4 are different from the foaming agent used in comparative example 1, the foam volume is smaller than that in comparative example 1, but the foam half-life period in example 2, example 3 and example 4 is obviously larger than that in comparative example 1, and the foam comprehensive evaluation index is obviously larger than that in comparative example 1; therefore, the intelligent layered nano foam stabilizer in the embodiment 1, the embodiment 2, the embodiment 3 and the embodiment 4 has higher foam stabilizing capability; there is no data on foam volume and half-life in comparative example 2, with total enhanced oil recovery of 18.2%, whereas 21.9%, 20.1%, 20.5% and 21.0% for examples 1, 2, 3 and 4, respectively, the displacement performance is better than that of comparative example 2; the total enhanced recovery rates of crude oil after the intelligent layered nano foam stabilizer in the embodiments 1, 2, 3 and 4 is recovered, washed and subjected to oil displacement again are respectively 21.5%, 19.0%, 19.3% and 20.0%, which indicates that the intelligent layered nano foam stabilizer has good reusability 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 attributes 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 (9)
1. The intelligent layered nano foam stabilizer comprises the following components in percentage by weight: MXene, inorganic matter, alkali source and cross-linking agent, which is characterized in that: the weight parts of the components are as follows: 1-10 parts of MXene, 0.1-1 part of inorganic substance, 0.01-0.1 part of alkali source and 0.01-0.1 part of cross-linking agent.
2. The intelligent layered nano foam stabilizer according to claim 1, wherein: the MXene is Ti3C2 MXene、Ti2C MXene、Nb2C MXene、V2C MXene、TiVC MXene、Ti3CN MXene、Ti2N Mxene、V2N MXene、Nb4C3 MXene、V4C3 MXene、TiNbC MXene、Mo2Ti2C3 Mxene、Mo2TiC2 MXene、Mo2C MXene、Cr2C MXene、Ta2C MXene、Ta4C3 MXene、W1.33C MXene、Mo1.33One or more of C MXene and VCrC MXene.
3. The intelligent layered nano foam stabilizer according to claim 1, wherein: the inorganic substance is NiCl2、FeCl3、CoCl2、Ni(NO3)2、Fe(NO3)3、Co(NO3)2One or two of them.
4. The intelligent layered nano foam stabilizer according to claim 1, wherein: the alkali source is sodium acetate or sodium citrate.
5. The intelligent layered nano foam stabilizer according to claim 1, wherein: the structure of the cross-linking agent is
6. The preparation method of the intelligent layered nano foam stabilizer comprises the following steps of 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 substances, an alkali source and a cross-linking agent are respectively weighed according to the formula proportion of the intelligent layered nano foam stabilizer for later use;
in the second step, the inorganic matters weighed in the first step are added into a proper amount of deionized water, and are uniformly dissolved by ultrasonic waves, and then the alkali source and the cross-linking agent weighed in the first step are added, and are uniformly dissolved by ultrasonic waves, so that a mixed solution A is obtained;
adding MXene weighed in the step one into the mixed solution A prepared in the step two in the step three, stirring for 2-4 hours under magnetic stirring, transferring the completely mixed solution into a high-temperature high-pressure reaction kettle, and carrying out closed 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 separated and washed, then added into 100mL deionized water for uniform ultrasonic dispersion, then crushed for a period of time by a crusher, and finally separated, washed and dried to obtain the finished product of the intelligent layered nano foam stabilizer.
7. The preparation method of the intelligent layered nano foam stabilizer according to claim 6, wherein the preparation method comprises the following steps: in the first step, the volume of the deionized water is 100 mL.
8. The preparation method of the intelligent layered nano foam stabilizer according to claim 6, wherein the preparation method comprises the following steps: in the fourth step, the crushing instrument is a non-contact ultrasonic cell crushing instrument externally connected with a circulating cooling device, the temperature of circulating cooling liquid is-20 ℃, and the crushing is carried out for 1-2h with the power of 700-900W.
9. The application of the intelligent layered nano foam stabilizer in foam flooding is characterized in that: the intelligent layered 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, the temporary plugging of large pores of a stratum is realized, and the crude oil recovery rate is improved; in addition, the intelligent layered 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 a liquid phase in a liquid film is hindered, the thinning of the liquid film is delayed, the coarsening and coalescence of the foam are prevented, and the aim of stabilizing the foam is fulfilled, so that the swept volume is enlarged, and the foam flooding efficiency is improved.
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