CN108841368B - Organic-inorganic composite oil displacement agent, organic-inorganic composite oil displacement system, preparation method and application - Google Patents
Organic-inorganic composite oil displacement agent, organic-inorganic composite oil displacement system, preparation method and application Download PDFInfo
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Abstract
The invention provides an organic-inorganic composite oil displacement agent, an organic-inorganic composite oil displacement system, a preparation method and application, and relates to the technical field of oil displacement agents, wherein the inorganic-organic composite oil displacement agent comprises the following raw materials in parts by mass: 5-20 parts of electronegative inorganic nano particles and 20-100 parts of electropositive amphiphilic polymer, and the technical problem that the application range of the conventional polyacrylamide in the development of high-temperature and high-salt oil reservoirs is limited is solved.
Description
Technical Field
The invention relates to the technical field of oil displacement agents, in particular to an organic-inorganic composite oil displacement agent, an organic-inorganic composite oil displacement system, a preparation method and application.
Background
Water flooding development becomes an indispensable part of the development process of each large oil field in China, but in the water flooding development process, due to the heterogeneity of strata, the phenomena of flooding and water channeling are easy to occur in the water flooding development process. The adoption of polymers for oil displacement has become one of the most common measures in mines. However, with the large-scale investment and development of high-temperature and high-salt oil reservoirs, the oil displacement effect of the conventional polymer system is limited. The prior commonly used partially hydrolyzed polyacrylamide system is easy to degrade at high temperature and has poor stability; under the condition of high salt, the thickening performance to water is obviously reduced due to the salt sensitive effect, and comprehensively, the application range of a partially hydrolyzed polyacrylamide system is limited under the condition of high temperature and high salt.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide an inorganic-organic composite oil displacement agent to solve the technical problem that the application range of the existing polyacrylamide system is limited in the development of high-temperature and high-salinity oil reservoirs.
The invention provides an inorganic-organic composite oil displacement agent, which comprises the following raw materials in parts by mass: 5-20 parts of electronegative inorganic nano particles and 20-100 parts of electropositive amphiphilic polymer.
Further, the inorganic-organic composite oil displacement agent comprises the following raw materials in parts by mass: 10-20 parts of electronegative inorganic nano particles and 20-50 parts of electropositive amphiphilic polymer.
Further, the electropositive amphiphilic polymer is a salt-tackified electropositive amphiphilic polymer;
preferably, the molecular structural formula of the salt-viscosified positively-charged amphiphilic polymer is:
wherein x is 80-200, y is 4-30, and z is 1-5.
Further, the particle size of the electronegative inorganic nanoparticles is 1-50 nm.
Further, the electronegative inorganic nanoparticles are selected from at least one of electronegative bentonite, electronegative silica, electronegative aluminum oxide and electronegative magnesium oxide, and are preferably electronegative silica.
Further, the electronegative inorganic nanoparticles are hydroxyl-modified silica.
The second purpose of the invention is to provide an inorganic-organic composite oil displacement system, which comprises the inorganic-organic composite oil displacement agent and water;
preferably, the water is oilfield injection water.
Further, the inorganic-organic composite oil displacement system comprises 0.025-1.2 wt% of inorganic-organic composite oil displacement agent and the balance of water;
preferably, the inorganic-organic composite oil displacement system comprises 0.05-0.2 wt% of electronegative inorganic nano particles, 0.2-1 wt% of electropositive amphiphilic polymer and the balance of water;
preferably, the inorganic-organic composite oil displacement system comprises 0.1-0.2 wt% of electronegative inorganic nano particles, 0.2-0.5 wt% of electropositive amphiphilic polymer and the balance of water.
The invention also aims to provide a preparation method of the inorganic-organic composite oil displacement system, which comprises the following steps:
(a) adding the electropositive amphiphilic polymer into water, and uniformly mixing to obtain a dispersion solution;
(b) adding electronegative inorganic nano particles into the dispersion solution, and uniformly mixing to obtain an inorganic-organic composite oil displacement system;
preferably, in the step (b), the electronegative inorganic nanoparticles are added into the dispersion solution, and after being uniformly mixed, the mixture is placed into a constant temperature water bath with the temperature of 45-55 ℃ and is kept for 20-40 min.
The fourth purpose of the invention is to provide the application of the inorganic-organic composite oil displacement agent or the inorganic-organic composite oil displacement system in the development of oil fields.
After the inorganic-organic composite oil displacement agent provided by the invention is mixed with oil field injection water to prepare an oil displacement system, the electronegative inorganic nanoparticles and the electropositive amphiphilic polymer are attracted by charges, so that the electronegative inorganic nanoparticles are adsorbed on a space network structure formed by associating electropositive amphiphilic polymer hydrophobic groups, the stability of the space network structure is enhanced, and the free electropositive amphiphilic polymer forms a polymer molecular brush under the adsorption of the electronegative inorganic nanoparticles, so that the electronegative inorganic nanoparticles and the electropositive amphiphilic polymer are mutually wound, filled and coated, the plastic viscosity of the oil displacement system is remarkably improved, the environmental sensitivity of the oil displacement system is reduced, and the oil displacement system has a wide application prospect in high-temperature and high-salt development oil reservoirs.
In addition, the oil displacement agent provided by the invention has the advantages of easily available raw materials, low cost price, safety, environmental protection and no environmental pollution.
According to the inorganic-organic composite oil displacement system, through charge attraction of the electronegative inorganic nanoparticles and the electropositive amphiphilic polymer, the electronegative inorganic nanoparticles are adsorbed on a space network structure formed by associating hydrophobic groups of the electropositive amphiphilic polymer, the stability of the space network structure is enhanced, and the free electropositive amphiphilic polymer forms a polymer molecular brush under the adsorption of the electronegative inorganic nanoparticles, so that the electronegative inorganic nanoparticles and the electropositive amphiphilic polymer are mutually wound, filled and coated, the plastic viscosity of the oil displacement system is remarkably improved, the environmental sensitivity of the oil displacement system is reduced, and the inorganic-organic composite oil displacement system has a wide application prospect in the development of high-temperature and high-salt oil reservoirs.
The preparation method of the inorganic-organic composite oil displacement system provided by the invention has the advantages of easily available raw materials, convenience in operation and wide application prospect in oilfield development.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is an SEM image of an inorganic-organic complex flooding system provided in example 10 of the present invention;
FIG. 2 is an SEM image of an oil displacing system provided in comparative example 7 of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The existing oil displacement system prepared from the partially hydrolyzed polyacrylamide oil displacement agent is easy to degrade at high temperature and has poor stability, and under the action of high salt, the thickening performance of the oil displacement system to water is obviously reduced, so that the application range of the oil displacement system in a high-temperature high-salt oil field is limited.
According to one aspect of the invention, the invention provides an inorganic and organic composite oil displacement agent, which comprises the following raw materials in parts by mass: 5-20 parts of electronegative inorganic nano particles and 20-100 parts of electropositive amphiphilic polymer.
In the inorganic-organic composite oil displacement agent provided by the invention, typical but non-limiting mass parts of the electronegative inorganic nanoparticles are 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, 10.5, 11, 11.5, 12, 12.5, 13, 13.5, 14, 14.5, 15, 15.5, 16, 16.5, 17, 17.5, 18, 18.5, 19, 19.5 or 20 parts.
The positively charged amphiphilic polymer molecular chain is provided with hydrophobic groups and hydrophilic groups, and the molecules form reversible physical association with certain blocking strength under the action of static electricity, hydrogen bonds or van der Waals force, so that a huge three-dimensional net-shaped space structure is formed, and the amphiphilic polymer solution still has high viscosity under low concentration. When the critical association concentration is exceeded, a supermolecular structure mainly based on intermolecular association is mainly formed, and good tackifying performance is shown, so that the high-temperature resistance, salt resistance and shearing resistance of the supermolecular structure are improved.
In the inorganic-organic composite oil displacement agent provided by the invention, the typical but non-limiting mass fraction of the electropositive amphiphilic polymer is, for example, 20, 22, 25, 28, 30, 32, 35, 38, 40, 42, 45, 48, 50, 52, 55, 58, 60, 62, 65, 68, 70, 72, 75, 78, 80, 82, 85, 88, 90, 92, 95, 98 or 100 parts.
After the inorganic-organic composite oil displacement agent and oil field injection water are mixed to support an oil displacement system, the electronegative inorganic nanoparticles and the electropositive amphiphilic polymer are attracted by charges, so that the electronegative inorganic nanoparticles are adsorbed on a space network structure formed by associating electropositive amphiphilic polymer hydrophobic groups, the stability of the space network structure is enhanced, and free electropositive amphiphilic polymer forms a polymer molecular brush under the adsorption of the electronegative inorganic nanoparticles, so that the electronegative inorganic nanoparticles and the electropositive amphiphilic polymer are mutually wound, filled and coated, the plastic viscosity of the oil displacement system is remarkably improved, the environmental sensitivity of the oil displacement system is reduced, and the oil displacement system has wide application prospects in high-temperature and high-salt development.
In addition, the oil displacement agent provided by the invention has the advantages of easily available raw materials, low cost price, safety, environmental protection and no environmental pollution.
In a preferred embodiment of the invention, the electropositive amphiphilic polymer is a salt-viscosified electropositive amphiphilic polymer.
The salt-resistant performance of the electropositive amphiphilic polymer is better by selecting the salt-tackified electropositive amphiphilic polymer as the electropositive amphiphilic polymer.
In a further preferred embodiment of the invention, the molecular structure of the salt-viscosifying amphiphilic polymer is:
wherein x is 80-200, y is 4-30, and z is 1-5.
In typical, but non-limiting embodiments of the invention, x is 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, or 200; y is 4, 6, 8, 10, 12, 15, 18, 20, 22, 25, 28 or 30; z is 1, 2, 3, 4 or 5.
In a further preferred embodiment of the invention, the salt thickening amphiphilic polymer has a weight average molecular weight of 2 x 106-3.58×106。
In a typical but non-limiting embodiment of the invention, the salt viscosifying amphiphilic polymer has a weight average molecular weight of 2 x 106、2.1×106、2.2×106、2.3×106、2.4×106、2.5×106、2.6×106、2.7×106、2.8×106、2.9×106、3×106、3.1×106、3.2×106、3.3×106、3.4×106、3.5×106Or 3.58X 106。
In addition, the oil-displacing agent provided by the invention overcomes the defect of poor temperature resistance and salt tolerance effects of a conventional polyacrylamide (HPAM) system through the mutual cooperation of the electronegative nano inorganic particles and the salt-tacking electropositive amphiphilic polymer, and also overcomes the problem that the performance of a complex system is influenced due to the serious agglomeration phenomenon of the inorganic nano particles.
In a preferred embodiment of the present invention, the particle size of the electronegative inorganic nanoparticles is 1 to 50 nm.
In typical but non-limiting embodiments of the present invention, the particle size of the electronegative inorganic nanoparticles is, for example, 1, 2, 5, 8, 10, 12, 15, 18, 20, 22, 25, 28, 30, 32, 35, 38, 40, 42, 45, 48, or 50 nm.
By selecting the electronegative inorganic nano particles with the particle size of 1-50nm as the raw materials of the oil displacement agent, the plugging strength of the generated oil displacement system is obviously enhanced, and the salt resistance and high temperature resistance are obviously improved.
In a further preferred embodiment of the present invention, the electronegative inorganic rice particles are selected from at least one of electronegative bentonite, electronegative silica, electronegative aluminum oxide, and electronegative magnesium oxide, and are preferably electronegative silica.
Researches show that under the charge attraction effect of the electronegative bentonite, the electronegative silicon dioxide, the electronegative magnesium oxide and the electropositive amphiphilic polymer, the electronegative bentonite, the electronegative silicon dioxide and the electronegative magnesium oxide are wound, filled and coated mutually, so that the plastic viscosity of an oil displacement system can be remarkably improved, and particularly when the electronegative inorganic nano particles are electronegative nano silicon dioxide particles, the electronegative nano silicon dioxide particles and the electropositive amphiphilic polymer can generate a large number of covalent bonds, so that the plastic viscosity of the oil displacement system is further improved.
In a preferred embodiment of the present invention, the electronegative inorganic nanoparticles are hydroxyl-modified silica.
In the present invention, hydroxyl-modified silica refers to nano-silica having a large number of hydroxyl groups on the surface.
In the present invention, the hydroxyl-modified silica is purchased from Beijing Deke island science and technology Co.
By selecting the hydroxyl modified silicon dioxide as the electronegative inorganic nano-particles, a large number of hydrogen bonds and silicon-oxygen bonds are formed between the hydroxyl on the surface of the hydroxyl modified silicon dioxide and the amphiphilic polymer, so that the strength of the association structure of the electronegative inorganic nano-particles and the hydrophobic groups of the amphiphilic polymer is further enhanced.
According to a second aspect of the invention, the invention provides an inorganic-organic composite oil displacement system, which comprises the inorganic-organic composite oil displacement agent provided by the invention and water.
The inorganic-organic composite oil displacement agent provided by the invention is dissolved in water to prepare an organic-inorganic oil displacement system, the electronegative inorganic nanoparticles and the electropositive amphiphilic polymer are attracted by charges, so that the electronegative inorganic nanoparticles are adsorbed on a space network structure formed by associating hydrophobic groups of the electropositive amphiphilic polymer, the stability of the space network structure is enhanced, and the free electropositive amphiphilic polymer forms a polymer molecular brush under the adsorption of the electronegative inorganic nanoparticles, so that the electronegative inorganic nanoparticles and the electropositive amphiphilic polymer are mutually wound and coated, the plastic viscosity of the oil displacement system is remarkably improved, the environmental sensitivity of the oil displacement system is reduced, and the oil displacement system has a wide application prospect in high-temperature and high-salt development.
In a further preferred embodiment of the invention, the water is oilfield injection water.
The oil displacement system is directly configured by adopting the oil field injection water, so that the system is convenient, quick, time-saving and labor-saving.
In a preferred embodiment of the invention, the inorganic-organic composite oil displacement system comprises 0.025-1.2 wt% of an agent-free organic composite oil displacement agent and the balance of water.
In the inorganic-organic complex oil displacing system provided by the present invention, the inorganic-organic complex oil displacing agent is typically, but not limited to, contained in an amount of 0.025 wt%, 0.028 wt%, 0.03 wt%, 0.04 wt%, 0.05 wt%, 0.06 wt%, 0.07 wt%, 0.08 wt%, 0.09 wt%, 0.1 wt%, 0.2 wt%, 0.3 wt%, 0.4 wt%, 0.5 wt%, 0.6 wt%, 0.7 wt%, 0.8 wt%, 0.9 wt%, 1 wt%, 1.1 wt%, or 1.2 wt%.
In a preferred embodiment of the invention, the water is oilfield injection water.
In a further preferred embodiment of the invention, the inorganic-organic composite flooding system comprises 0.05 to 0.2 weight percent of electronegative inorganic nano particles, 0.2 to 1 weight percent of electropositive amphiphilic polymer and the balance of water.
In the preferred embodiment of the present invention, the content of the electronegative inorganic nanoparticles in the inorganic-organic complex flooding system is, for example, 0.05 wt%, 0.06 wt%, 0.07 wt%, 0.08 wt%, 0.09 wt%, 0.1 wt%, 0.11 wt%, 0.12 wt%, 0.13 wt%, 0.14 wt%, 0.15 wt%, 0.16 wt%, 0.17 wt%, 0.18 wt%, 0.19 wt%, or 0.2 wt%; the content of the electropositive amphiphilic polymer is, for example, 0.2 wt%, 0.25 wt%, 0.3 wt%, 0.35 wt%, 0.4 wt%, 0.45 wt%, 0.5 wt%, 0.55 wt%, 0.6 wt%, 0.65 wt%, 0.7 wt%, 0.75 wt%, 0.8 wt%, 0.85 wt%, 0.9 wt%, 0.95 wt%, or 1 wt%.
According to a third aspect of the present invention, the present invention provides a preparation method of the above inorganic-organic composite oil displacement system, comprising the following steps:
(a) adding the electropositive amphiphilic polymer into water, and uniformly mixing to obtain a dispersion solution;
(b) and adding the electronegative inorganic nano particles into the dispersion solution, and uniformly mixing to obtain the inorganic-organic composite oil displacement system.
The preparation method of the inorganic-organic composite oil displacement system provided by the invention has the advantages of easily available raw materials, convenience in operation and wide application prospect in oilfield development.
In a preferred embodiment of the present invention, in the step (b), the electronegative inorganic nanoparticles are added into the dispersion solution, mixed uniformly, and then placed into a constant temperature water bath with a temperature of 45-55 ℃ for heat preservation for 20-40 min.
In the step (b), after the electronegative inorganic nano particles and the dispersion solution are uniformly mixed, the temperature is kept for 20-40min at 45-55 ℃, so that the plastic viscosity of the oil displacement system is enhanced, and the stability of the oil displacement system is better.
In a typical but non-limiting embodiment of the invention, the temperature at which the incubation treatment in step (b) is carried out is, for example, 45 ℃, 46 ℃, 47 ℃, 48 ℃, 49 ℃, 50 ℃, 51 ℃, 52 ℃, 53 ℃, 54 ℃, 55 ℃, 56 ℃, 57 ℃, 58 ℃, 59 ℃, or 60 ℃; the heat preservation treatment time is 20min, 21min, 22min, 23min, 24min, 25min, 26min, 27min, 28min, 29min, 30min, 31min, 32min, 33min, 34min, 35min, 36min, 37min, 38min, 39min or 40 min.
According to a fourth aspect of the present invention, the present invention provides an application of the above inorganic-organic composite oil displacement agent or the above inorganic-organic composite oil displacement system in oilfield development.
The inorganic organic oil displacement agent or the inorganic organic oil displacement system provided by the invention is particularly suitable for being applied to the development of high-temperature high-salt oil fields, overcomes the defects of poor temperature resistance and salt tolerance and easy curling and deformation of polymer chains of the conventional polyacrylamide polymer system, overcomes the defects of easy agglomeration, poor dispersibility and poor tackifying effect of the conventional inorganic nanoparticle tackifying system, obviously improves the plastic viscosity of the oil displacement system, reduces the environmental sensitivity of the oil displacement system, and has wide application prospect in the development of high-temperature high-salt oil reservoirs.
The technical solution provided by the present invention is further described below with reference to examples and comparative examples.
Example 1
The embodiment provides an inorganic-organic composite oil displacement agent, which comprises 0.5g of hydroxyl modified silicon dioxide and 10g of salt-tackified electropositive amphiphilic polymer, wherein the structural formula of the salt-tackified electropositive amphiphilic polymer is as follows:
x is 80-200, y is 4-30, and z is 1-5; the weight average molecular weight of the salt-viscosifying amphiphilic polymer is 3.58 x 106(ii) a Hydroxyl-modified silica is available from Ishikaki technologies, Inc., Beijing Germany.
Example 2
The embodiment provides an inorganic-organic composite oil displacement agent, which comprises 2g of hydroxyl modified silica and 2g of salt-tackified positive-electricity amphiphilic polymer, wherein the salt-tackified positive-electricity amphiphilic polymer and the hydroxyl modified silica are the same in batch as the raw materials in the embodiment 1.
Example 3
The embodiment provides an inorganic-organic composite oil displacement agent, which comprises 1g of hydroxyl modified silica and 2g of salt-tackified positive-electricity amphiphilic polymer, wherein the salt-tackified positive-electricity amphiphilic polymer and the hydroxyl modified silica are the same in batch as the raw materials in the embodiment 1.
Example 4
The embodiment provides an inorganic-organic composite oil displacement agent, which comprises 1g of hydroxyl modified silica and 4g of salt-tackified positive-electricity amphiphilic polymer, wherein the salt-tackified positive-electricity amphiphilic polymer and the hydroxyl modified silica are the same in batch as the raw materials in the embodiment 1.
Example 5
The embodiment provides an inorganic-organic composite oil displacement agent, which comprises 1g of hydroxyl modified silica and 5g of salt-tackified positive-electricity amphiphilic polymer, wherein the salt-tackified positive-electricity amphiphilic polymer and the hydroxyl modified silica are the same in batch as the raw materials in the embodiment 1.
Comparative example 1
The comparative example provides an oil displacement agent, and is different from the example 5 in that polyacrylamide with the weight-average molecular weight of 3500 ten thousand is adopted to replace salt for tackifying the positive-electricity amphiphilic polymer.
Comparative example 2
This comparative example provides an oil-displacing agent that differs from the inorganic organic oil-displacing agent provided in example 5 in that no electronegative inorganic nanoparticles were added.
Comparative example 3
This comparative example provides an oil-displacing agent which differs from the inorganic-organic oil-displacing agent provided in example 5 in that unmodified nanosilica is used instead of the hydroxyl-modified silica.
Comparative example 4
This comparative example provides an oil-displacing agent, which is different from example 5 in that hydroxyl group-modified nano SiO2The particles were 5g and the salt-viscosified positively charged amphiphilic polymer was 1 g.
Comparative example 5
This comparative example provides an oil-displacing agent, which is different from example 5 in that hydroxyl group-modified nano SiO2The particles were 0.1g and the salt-tackified electropositive amphiphilic polymer was 5 g.
Examples 6 to 10
Examples 6 to 10 each provide an inorganic-organic complex flooding system consisting of
The oil displacement agent provided in examples 1-5 and 1000g of oilfield injection water were prepared, the composition of which is shown in table 1 below:
TABLE 1 oilfield injection Water composition
Example 11
The embodiment provides a preparation method of an inorganic-organic composite oil displacement system, and the embodiments 6 to 10 are prepared according to the method, and specifically comprise the following steps:
(a) adding the electropositive salt tackifying amphiphilic polymer into oil field injection water at room temperature, and stirring for 3 hours until the electropositive salt tackifying amphiphilic polymer is completely dissolved to obtain a dispersion solution;
(b) adding hydroxyl modified silicon dioxide into the dispersion solution, and stirring until the mixture is uniformly mixed. And putting the mixture into a constant-temperature water bath at 50 ℃ and heating the mixture for 30min to obtain the inorganic-organic composite oil displacement system.
Example 12
The present example provides an inorganic-organic composite oil displacement system, which is prepared from the oil displacement agent provided in example 5 and 1000g of oilfield injection water, and the composition of the oilfield injection water is the same as that in example 10, but the present example differs from example 10 in that, in the step (b), a heat preservation operation of heating in a constant temperature water bath at 50 ℃ for 30min is not performed during the preparation of the inorganic-organic composite oil displacement system.
Comparative examples 6 to 10
The comparative example provides an oil displacement system which is prepared from the oil displacement agent and the oil field injection water provided in the comparative examples 1 to 4 respectively, the preparation method of the system is the same as that provided in the example 11, and the adopted oil field injection water is the same as that of the oil field in the example 10.
Test example 1
Scanning electron microscope tests are respectively carried out on the inorganic-organic composite oil displacement system provided in the embodiment 10 and the oil displacement system provided in the comparative example 7, and the results are shown in fig. 1 and fig. 2, wherein fig. 1 is an SEM image of the inorganic-organic composite oil displacement system provided in the embodiment 10; FIG. 2 is an SEM image of the flooding system provided in comparative example 7; as can be seen from the comparison between fig. 1 and fig. 2, in fig. 1, the hydroxyl modified silica is uniformly dispersed on the spatial network structure of the salt-tackified electropositive amphiphilic polymer, and the hydroxyl modified silica and the amphiphilic polymer are mutually wrapped, intertwined, mutually filled, and mutually wrapped, so that the stability and the plastic viscosity of the system are significantly improved.
Test example 2
The apparent viscosities of the flooding systems provided in examples 6 to 10 and examples 12 and comparative examples 6 to 10 at 50 ℃ were measured, respectively, and the results are shown in table 2:
table 2 oil displacing system performance data sheet
As can be seen from the comparison between examples 6-10 and comparative examples 6-7 in Table 2, the apparent viscosity of the inorganic-organic composite system provided in examples 6-10 is significantly higher than that of comparative examples 6-7, which indicates that the oil displacing system prepared by the mutual cooperation of the electronegative nano-silica and the salt-tackified electropositive amphiphilic polymer in the present invention, not only the electronegative inorganic nanoparticles are adsorbed on the space network structure formed by associating the hydrophobic groups of the electropositive amphiphilic polymer by the charge attraction of the electronegative inorganic nanoparticles and the electropositive amphiphilic polymer to enhance the stability of the space network structure, but also the free electropositive amphiphilic polymer forms a polymer molecular brush under the adsorption of the electronegative inorganic nanoparticles, so that the electronegative inorganic nanoparticles and the electropositive amphiphilic polymer are intertwined and coated with each other to significantly improve the plastic viscosity of the oil displacing system, the environmental sensitivity of an oil displacement system is reduced, so that the oil displacement system has wide application prospect in the development of high-temperature and high-salinity oil reservoirs.
As can be seen from comparison between examples 6-10 and comparative example 8, the electronegative silica and the salt-tackified electropositive amphiphilic polymer are mutually cooperated to adsorb each other under the action of charges, so that the plastic viscosity of the oil displacing system is remarkably improved.
As can be seen from comparison between examples 6-10 and comparative examples 9-10, in the oil displacement system provided by the invention, when the content of the electronegative nano-silica is 0.05-0.2 wt% and the content of the electropositive amphiphilic polymer is 0.2-1 wt%, the plastic viscosity of the oil displacement system is remarkably improved, and the oil displacement system is more suitable for the requirements of high-temperature and high-salinity reservoir development.
As can be seen from the comparison between example 10 and example 12, the electronegative nanosilicon dioxide is added to the amphiphilic polymer dispersion solution, and after uniform mixing, heat preservation treatment is performed, so that the electronegative inorganic nanoparticles and the amphiphilic polymer are more fully intertwined and coated with each other, and the plastic viscosity of the oil displacing system is higher.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (11)
1. The inorganic-organic composite oil displacement agent is characterized by comprising the following raw materials in parts by mass: 5-20 parts of electronegative inorganic nano particles and 20-100 parts of electropositive amphiphilic polymer;
the electropositive amphiphilic polymer is a salt-tackified electropositive amphiphilic polymer;
the molecular structural formula of the salt-tackified electropositive amphiphilic polymer is as follows:
wherein x is 80-200, y is 4-30, and z is 1-5;
the electronegative inorganic nanoparticles are hydroxyl modified silica.
2. The inorganic-organic composite oil displacement agent according to claim 1, characterized by comprising the following raw materials in parts by mass: 10-20 parts of electronegative inorganic nano particles and 20-50 parts of electropositive amphiphilic polymer.
3. The inorganic-organic composite oil-displacing agent according to claim 1 or 2, characterized in that the particle size of the hydroxyl-modified silica is 1 to 50 nm.
4. An inorganic-organic complex oil displacement system characterized by comprising the inorganic-organic complex oil displacement agent according to any one of claims 1 to 3 and water.
5. The inorganic-organic composite flooding system according to claim 4, characterized in that the water is oilfield injection water.
6. The inorganic-organic composite oil displacement system of claim 4, which comprises 0.025-1.2 wt% of inorganic-organic composite oil displacement agent and the balance of water.
7. The inorganic-organic composite flooding system of claim 4, wherein the inorganic-organic composite flooding system comprises 0.05-0.2 wt% of electronegative inorganic nanoparticles, 0.2-1 wt% of electropositive amphiphilic polymer, and the balance water.
8. The inorganic-organic composite flooding system of claim 4, wherein the inorganic-organic composite flooding system comprises 0.1-0.2 wt% of electronegative inorganic nanoparticles, 0.2-0.5 wt% of electropositive amphiphilic polymer, and the balance water.
9. The preparation method of the inorganic-organic composite flooding system according to any one of claims 4 to 8, characterized by comprising the following steps:
(a) adding the electropositive amphiphilic polymer into water, and uniformly mixing to obtain a dispersion solution;
(b) and adding the electronegative inorganic nano particles into the dispersion solution, and uniformly mixing to obtain the inorganic-organic composite oil displacement system.
10. The preparation method of the inorganic-organic composite oil displacing system of claim 9, wherein in the step (b), the electronegative inorganic nanoparticles are added into the dispersion solution, and after being uniformly mixed, the mixture is placed into a thermostatic water bath with the temperature of 45-55 ℃, and the temperature is kept for 20-40 min.
11. The use of the inorganic-organic composite oil-displacing agent according to any one of claims 1 to 3 or the inorganic-organic composite oil-displacing system according to any one of claims 4 to 8 in oilfield development.
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