CN114957550A - Deep profile control re-bonding supramolecular gel particle and preparation method thereof - Google Patents
Deep profile control re-bonding supramolecular gel particle and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of oil field profile control and water plugging agents, and provides deep profile control re-bonding supramolecular gel particles and a preparation method thereof. The gel particle raw materials comprise the following components in percentage by mass: 10% -30% of acrylamide monomer; 10-20% of acrylic monomer; 0.1 to 5 percent of main body recognition functional monomer; 0.1 to 5 percent of object recognition functional monomer; 0.01% -0.5% of cross-linking agent; 0.01 to 1.0 percent of initiator; 0.1 to 1.0 percent of stabilizer; the balance of the aqueous phase. The invention also provides a preparation method and application of the supramolecular gel particle. The supermolecule gel particles prepared by the invention are used for deep profile control of a fractured reservoir, are injected into a stratum in a particle form, have the characteristic of re-bonding recovery after rapid injection and stratum migration and breakage, and achieve the purpose of effectively plugging deep fractures.
Description
Technical Field
The invention belongs to the technical field of agents for profile control and water shutoff of oil fields, and particularly relates to a preparation method of deep profile control and then bonding supramolecular gel particles, which is particularly applied to low-permeability fractured reservoirs.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
In recent years, with the continuous deepening of oil field development, the heterogeneity of an oil reservoir is stronger, residual oil is generally distributed, the phenomena of flooding and channeling are serious, injected fluid is ineffective to circulate, and effective plugging is difficult to realize by a conventional polymer gel profile control means. Researches show that the pre-crosslinked gel particles have good effects on deep profile control of oil fields with strong heterogeneity, high water content and large pore canals. Because the gel particles have certain deformability after water absorption and expansion, the gel particles can move into the deep part of the stratum through deformation under certain pressure difference, and the particles continuously absorb water and expand due to the gradual reduction of the stratum pressure in the deep part of the stratum and are retained in the large pore passage to block the large pore passage, so that the stratum permeability is adjusted, and the deep liquid flow steering effect is achieved. The gel particles have simple preparation process and good stability in the use process, and the defects of poor underground gelling effect and limited plugging effect of the traditional gel plugging agent are overcome.
Although the existing pre-crosslinked gel particle profile control and flooding technology has better effects on reducing water channeling of old oil fields and improving the recovery ratio of crude oil, some technical defects and application limitations are also shown along with popularization and application of gel particles. For example, in the field injection construction and the complex deep migration process of an oil reservoir, gel particles which are fully water-absorbing and expanded due to shearing and extrusion are broken and easily washed out by subsequent injection fluid, so that the problems of unstable fracture plugging capability and deep profile control effect or poor effect exist.
Disclosure of Invention
In order to solve the problems, the invention provides a preparation method of deep profile control supramolecular gel particles capable of being bonded again after being crushed, the gel particles can generate the effects of dynamic and reversible recovery of the structure and mutual bonding again through the host-guest recognition supramolecular action after being rapidly injected and the stratum migration and crushing, the high-strength fracture plugging capability of the gel particles is ensured, and the effect of efficient deep profile control of fractured reservoirs is achieved.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a deep profile control re-bonded supramolecular gel particle, which consists of the following raw materials in percentage by weight: 10% -30% of acrylamide monomer; 10-20% of acrylic monomer; 0.1 to 5 percent of main body identification functional monomer; 0.1 to 5 percent of object recognition functional monomer; 0.01 to 0.5 percent of cross-linking agent; 0.01 to 1.0 percent of initiator; 0.1 to 1.0 percent of stabilizer; the balance of water, the weight of each raw material is 100 percent;
the main body recognition function unit includes: any one of allyl-alpha-cyclodextrin, allyl-beta-cyclodextrin and allyl-gamma-cyclodextrin;
the object recognition functional monomer comprises: one or a combination of two or more of dimethylallyl quaternary ammonium salt, styrene, acrylamide-N-adamantane and acrylamide-N-cycloalkane.
In a second aspect of the present invention, there is provided a method for preparing the deep profile control re-bonding supramolecular gel particles, comprising:
sequentially adding an acrylamide monomer, an acrylic acid monomer, a host recognition functional monomer and an object recognition functional monomer into a water phase in an inert atmosphere, uniformly mixing, and adjusting the pH value to 5.0-8.5; then adding a cross-linking agent and a stabilizing agent, and uniformly mixing; adding an initiator, and uniformly mixing to obtain a water phase solution;
heating the aqueous phase solution to initiate polymerization reaction to obtain gel;
preparing the gel into particles to obtain the product.
The invention has the advantages of
(1) According to the invention, the host recognition monomer and the object recognition monomer are introduced to the main chain of the internal structure of the polymer gel particles, the characteristics of shearing, crushing and then bonding of the synthesized gel particles are endowed through the host-object recognition supermolecule effect, and the prepared gel particle deep profile control agent has good plugging capability on cracks and strong scouring resistance, and can be used as an excellent fractured oil reservoir profile control agent.
(2) According to the gel particle structure, the host recognition monomer and the guest recognition monomer are on the same polymer molecular chain, so that the problem of adsorption difference between a host group and a guest group generated by the polymer molecular chain can be greatly reduced when the host recognition monomer and the guest recognition monomer are transported in a stratum porous medium, the host-guest recognition supermolecule effect in deep cracks is further improved, and the re-adhesion performance of the supermolecule gel particles is enhanced.
(3) The supramolecular gel particle synthesized by the invention contains chemical agents required by crosslinking and re-bonding, is injected and transported in a stratum in one form of solid particles, and all components are contained in the particle, so that the problems of non-gelling or low-gelling quality caused by dilution and shear degradation of stratum water in the process of transporting a conventional underground crosslinking system in the stratum are solved. The plugging capability and the profile control effect on deep cracks are improved.
(4) The supermolecule gel particles designed by the invention can properly reduce the content of water-absorbing expansion monomers (acrylamide and acrylic acid), and can be further aggregated and increased in size through the re-adhesion action even if the water-absorbing expansion size of the gel particles is not enough after the gel particles enter a deep stratum, so that the problem of particle breakage caused by shearing is reduced while deep cracks are effectively blocked.
(5) The supermolecule intelligent gel particles designed by the invention can be adjusted in particle size according to oil reservoir conditions, and have the advantages of nanoscale, micron-scale or millimeter-scale particle size and strong adaptability. And the method can also be used for deep profile control of fractured reservoirs.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
Fig. 1 shows the macroscopic adhesion performance of the re-adhesive supramolecular gel prepared in example 1 of the present invention (red and blue gel blocks are dyed with different dyes, respectively);
FIG. 2 shows the primary particle size distribution of supramolecular gel particles prepared in example 2 of the present invention;
figure 3 is a graph of the viscosity shear-recovery performance of the supramolecular gel prepared in example 2 of the present invention (in comparison to conventional gel particles).
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
A preparation method of deep profile control re-bonding supramolecular gel particles comprises the following raw materials in percentage by mass:
10% -30% of acrylamide monomer; 10-20% of acrylic monomer; 0.1 to 5 percent of main body recognition functional monomer; 0.1 to 5 percent of object recognition functional monomer; 0.01 to 0.5 percent of cross-linking agent; 0.01 to 1.0 percent of initiator; 0.01 to 1.0 percent of stabilizer; the balance of the aqueous phase.
In some embodiments, the subject identification function cell comprises: any one of allyl-alpha-cyclodextrin, allyl-beta-cyclodextrin and allyl-gamma-cyclodextrin; preferably allyl-beta-cyclodextrin.
In some embodiments, the guest recognition functional monomer comprises: one or a combination of two or more of dimethylallyl quaternary ammonium salt, styrene, acrylamide-N-adamantane and acrylamide-N-cycloalkane.
In some embodiments, the crosslinking agent comprises N, N-methylene bisacrylamide, ethylene glycol dimethacrylate; preferably N, N-methylenebisacrylamide;
in some embodiments, the initiator comprises at least one of ammonium persulfate, potassium persulfate;
in some embodiments, the stabilizing agent comprises at least one of ethylenediaminetetraacetic acid disodium salt, sodium citrate, sodium lactate;
in some embodiments, the aqueous phase comprises at least one of distilled water, deionized water;
in some embodiments, the method comprises the steps of:
introducing nitrogen into water for at least 30min, then sequentially adding an acrylamide monomer, an acrylic acid monomer, a host recognition functional monomer and an object recognition functional monomer into a water phase under the condition of stirring, stirring until the solution becomes clear, and adjusting the pH value of the solution to be 5.0-8.5 by using a pH value regulator; then adding a cross-linking agent and a stabilizing agent, and stirring until the cross-linking agent and the stabilizing agent are completely dissolved; adding an initiator, stirring to form a uniform aqueous phase solution, standing and polymerizing for 0.5-4h at the temperature of 40-70 ℃, and reacting to obtain gel; and then cutting the gel into pieces, drying and grinding the gel pieces at 40-80 ℃, and screening nano-scale to millimeter-scale particles to obtain the target supramolecular gel particles.
In some embodiments, the pH adjusting agent is at least one of sodium hydroxide, potassium hydroxide, sodium carbonate, triethylamine.
The invention also provides application of the deep profile control and then bonding supramolecular gel particles, which is applied to deep profile control of fractured reservoirs, and the specific application method is as follows:
adding the deep profile control and then bonding the supramolecular gel particles into injection fluid, adding the supramolecular gel particles with the concentration of 500-3000mg/L, and pumping the mixture into the stratum after uniformly stirring.
The present invention is described in further detail below with reference to specific examples, which are intended to be illustrative of the invention and not limiting.
Example 1
Preparation method of deep profile control re-bonding supramolecular gel particles
(1) Raw materials: 17.82g of acrylamide monomer; 9.4112g of main body identification functional monomer; 2.7672g of an object recognition functional monomer; 0.02056g of a crosslinking agent; 0.285g of initiator; 69.511g of distilled water. Wherein: the main body recognition functional monomer is allyl-beta-cyclodextrin; the object recognition functional monomer is cetyl dimethyl allyl ammonium chloride; the cross-linking agent is N, N-methylene bisacrylamide; the initiator is ammonium persulfate.
(2) The preparation method comprises the following steps: respectively weighing acrylamide, allyl-beta-cyclodextrin and hexadecyl dimethyl allyl ammonium chloride according to the contents, sequentially adding the weighed acrylamide, allyl-beta-cyclodextrin and hexadecyl dimethyl allyl ammonium chloride into a beaker filled with distilled water while stirring, and stirring until the solution becomes clear; then, N-methylene bisacrylamide was added to the above solution, and stirred until all was dissolved. Finally, ammonium persulfate solution is added, then stirring is carried out for 30min, and air in the solution is removed by ultrasonic oscillation for 10min (power of 80W), so as to prepare water phase solution with uniform dispersion. Placing the water phase solution in a constant temperature water bath kettle at 40 ℃, carrying out polymerization reaction for 2h, and taking out. And cutting the obtained gel into blocks, washing the gel for 4 times by using distilled water, drying the gel in a constant-temperature drying oven at 60 ℃ for 12 hours, taking out the gel, and grinding the gel for 4 hours at 500r/min by using a planetary ball mill to prepare nano-grade particles, namely the target supramolecular gel particles.
Example 2:
a method for preparing supramolecular gel particles through deep profile control and re-bonding is different from that in example 1 in that the dosage of a cross-linking agent is changed.
(1) Raw materials: 17.82g of acrylamide monomer; 9.4112g of main body identification functional monomer; 2.7672g of an object recognition functional monomer; 0.12336g of a crosslinking agent; 0.285g of initiator; 69.511g of distilled water. Wherein: the main body recognition functional monomer is allyl-beta-cyclodextrin; the object recognition functional monomer is cetyl dimethyl allyl ammonium chloride; the cross-linking agent is N, N-methylene bisacrylamide; the initiator is ammonium persulfate.
(2) The preparation method of the supramolecular gel particle deep profile control agent is described in example 1.
Example 3:
a method for preparing supermolecule gel particles by deep profile control and re-bonding is different from the method in example 1 in that acrylic monomers are added, and the quality of various raw materials is changed.
(1) Raw materials: 8.91g of acrylamide monomer; 8.91g of acrylic monomer; 9.4112g of main body identification functional monomer; 2.7672g of an object recognition functional monomer; 0.02056g of a crosslinking agent; 0.285g of initiator; 69.511g of distilled water. Wherein: the main body recognition functional monomer is allyl-beta-cyclodextrin; the object recognition functional monomer is cetyl dimethyl allyl ammonium chloride; the cross-linking agent is N, N-methylene bisacrylamide; the initiator is ammonium persulfate.
(2) The preparation method of the supramolecular gel particle deep profile control agent is as described in example 1, and only the polymerization temperature is changed to 50 ℃.
Example 4:
the preparation method of the supramolecular gel particles through deep profile control and re-bonding is different from that of the supramolecular gel particles in example 1 in that the object recognition functional monomer is acrylamide-N-adamantane and the quality of various raw materials is changed.
(1) Raw materials: 18.515g of acrylamide monomer; 9.778g of main body identification functional monomer; 1.706g of object recognition functional monomer; 0.02056g of a crosslinking agent; 0.285g of initiator; 69.695g of distilled water. Wherein: the main body recognition functional monomer is allyl-beta-cyclodextrin; the object recognition functional monomer is acrylamide-N-adamantane; the cross-linking agent is N, N-methylene bisacrylamide; the initiator is ammonium persulfate.
(2) The preparation method comprises the following steps: respectively weighing acrylamide, allyl-beta-cyclodextrin and acrylamide-N-adamantane according to the content, sequentially adding the weighed acrylamide, allyl-beta-cyclodextrin and acrylamide-N-adamantane into a beaker filled with distilled water while stirring, and stirring until the solution becomes clear; then, N-methylene bisacrylamide was added to the above solution, and stirred until all was dissolved. Finally, ammonium persulfate solution is added, then stirring is carried out for 30min, and air in the solution is removed by ultrasonic oscillation for 10min (power of 80W), so as to prepare water phase solution with uniform dispersion. Placing the water phase solution in a constant temperature water bath kettle at 50 ℃, reacting for 2h, and taking out. And cutting the obtained gel into blocks, washing the gel for 4 times by using distilled water, drying the gel in a constant-temperature drying oven at 60 ℃ for 12 hours, taking out the gel, grinding the gel for 4 hours by using a planetary ball mill at 500r/min, and screening nano-scale to millimeter-scale particles to obtain the target supramolecular gel particles.
Example 5:
the preparation method of the supermolecule gel particles after deep profile control and re-bonding is different from the embodiment 1 in that styrene serving as an object recognition functional monomer and the quality of various raw materials are changed.
(1) Raw materials: 19.356g of acrylamide monomer; 9.778g of main body identification functional monomer; 0.865g of an object recognition functional monomer; 0.02056g of a crosslinking agent; 0.285g of initiator; 69.695g of distilled water. Wherein: the main body recognition functional monomer is allyl-beta-cyclodextrin; the object recognition functional monomer is styrene; the cross-linking agent is N, N-methylene bisacrylamide; the initiator is ammonium persulfate.
(2) The preparation method comprises the following steps: respectively weighing acrylamide, allyl-beta-cyclodextrin and styrene according to the content, sequentially adding the weighed materials into a beaker filled with distilled water while stirring, and stirring until the solution becomes clear; then, N-methylene bisacrylamide was added to the above solution, and stirred until all was dissolved. Finally, ammonium persulfate solution is added, then stirring is carried out for 30min, and air in the solution is removed by ultrasonic oscillation for 10min (power of 80W), so as to prepare water phase solution with uniform dispersion. Placing the water phase solution in a constant temperature water bath kettle at 50 ℃, reacting for 2h, and taking out. And cutting the obtained gel into blocks, washing the gel for 4 times by using distilled water, drying the gel in a constant-temperature drying oven at 60 ℃ for 12 hours, taking out the gel, grinding the gel for 4 hours by using a planetary ball mill at 500r/min, and screening nano-scale to millimeter-scale particles to obtain the target supramolecular gel particles.
Example 6:
the preparation process of supermolecular gel particle includes altering the main body recognizing monomer to allyl-alpha-cyclodextrin and the quality of the material, and is different from that in example 1.
(1) Raw materials: 18.8013g of acrylamide monomer; 8.4299g of main body identification functional monomer; 2.7672g of an object recognition functional monomer; 0.02056g of a crosslinking agent; 0.285g of initiator; 69.511g of distilled water. 18.515g of acrylamide monomer; 9.778g of main body identification functional monomer; 1.706g of an object recognition functional monomer; 0.02056g of a crosslinking agent; 0.285g of initiator; 69.695g of distilled water. Wherein: the main body recognition functional monomer is allyl-alpha-cyclodextrin; the object recognition functional monomer is cetyl dimethyl allyl ammonium chloride; the cross-linking agent is N, N-methylene bisacrylamide; the initiator is ammonium persulfate.
(2) The preparation method comprises the following steps: respectively weighing acrylamide, allyl-alpha-cyclodextrin and hexadecyl dimethyl allyl ammonium chloride according to the contents, sequentially adding the weighed acrylamide, allyl-alpha-cyclodextrin and hexadecyl dimethyl allyl ammonium chloride into a beaker filled with distilled water while stirring, and stirring until the solution becomes clear; then, N-methylene bisacrylamide was added to the above solution, and stirred until all was dissolved. Finally, ammonium persulfate solution is added, then stirring is carried out for 30min, and air in the solution is removed by ultrasonic oscillation for 10min (power of 80W), so as to prepare water phase solution with uniform dispersion. Placing the water phase solution in a constant temperature water bath kettle at 40 ℃, carrying out polymerization reaction for 2h, and taking out. And cutting the obtained gel into blocks, washing the gel for 4 times by using distilled water, drying the gel in a constant-temperature drying oven at 60 ℃ for 12 hours, taking out the gel, and grinding the gel for 4 hours at 500r/min by using a planetary ball mill to prepare nano-grade particles, namely the target supramolecular gel particles.
Example 7:
the preparation process of supermolecular gel particle includes altering the main body recognizing monomer to allyl-gamma-cyclodextrin and the quality of the material, and is different from that in example 1.
(1) Raw materials: 16.5225g of acrylamide monomer; 10.7087g of main body identification functional monomer; 2.7672g of an object recognition functional monomer; 0.02056g of a crosslinking agent; 0.285g of initiator; 69.511g of distilled water. 18.515g of acrylamide monomer; 9.778g of main body identification functional monomer; 1.706g of an object recognition functional monomer; 0.02056g of a crosslinking agent; 0.285g of initiator; 69.695g of distilled water. Wherein: the main body recognition functional monomer is allyl-alpha-cyclodextrin; the object recognition functional monomer is cetyl dimethyl allyl ammonium chloride; the cross-linking agent is N, N-methylene bisacrylamide; the initiator is ammonium persulfate.
(2) The preparation method comprises the following steps: respectively weighing acrylamide, allyl-alpha-cyclodextrin and hexadecyl dimethyl allyl ammonium chloride according to the contents, sequentially adding the weighed acrylamide, allyl-alpha-cyclodextrin and hexadecyl dimethyl allyl ammonium chloride into a beaker filled with distilled water while stirring, and stirring until the solution becomes clear; then, N-methylene bisacrylamide was added to the above solution, and stirred until all was dissolved. Finally, ammonium persulfate solution is added, then stirring is carried out for 30min, and air in the solution is removed by ultrasonic oscillation for 10min (power of 80W), so as to prepare water phase solution with uniform dispersion. Placing the water phase solution in a constant temperature water bath kettle at 40 ℃, carrying out polymerization reaction for 2h, and taking out. And cutting the obtained gel into blocks, washing the gel for 4 times by using distilled water, drying the gel in a constant-temperature drying oven at 60 ℃ for 12 hours, taking out the gel, and grinding the gel for 4 hours at 500r/min by using a planetary ball mill to prepare nano-grade particles, namely the target supramolecular gel particles.
Comparative example 1:
a conventional gel particle profile control agent for deep profile control as described in embodiment one, except that the gel particle profile control agent does not contain a host recognition functional monomer and a guest recognition functional monomer.
(1) Raw materials: 12.5g of acrylamide monomer; 0.069g of cross-linking agent; initiator 0.1425 g; 37.2885g of distilled water. Wherein: the cross-linking agent is N, N-methylene-bisacrylamide; the initiator is ammonium persulfate.
(2) The preparation method comprises the following steps: weighing acrylamide according to the content, sequentially adding the acrylamide into a beaker filled with distilled water while stirring, and stirring until the solution becomes clear; then, N-methylene bisacrylamide was added to the above solution, and stirred until all was dissolved. Finally, ammonium persulfate solution is added, then stirring is carried out for 30min, and air in the solution is removed by ultrasonic oscillation for 10min (power of 80W), so as to prepare water phase solution with uniform dispersion. Placing the water phase solution in a constant temperature water bath kettle at 50 ℃, reacting for 2h, and taking out. And cutting the obtained gel into blocks, washing the gel for 4 times by using distilled water, drying the gel in a constant-temperature drying oven at 60 ℃ for 12 hours, taking out the gel, grinding the gel for 4 hours at 500r/min by using a planetary ball mill, and screening nano-scale to millimeter-scale particles to obtain the target conventional gel particles.
And (3) performance testing:
1. the properties of the deep profile control rebonded supramolecular gel particles prepared in example 1 were tested, specifically:
the prepared supramolecular gel particle bulk gel was stained with red and blue colors, respectively, as shown in fig. 1 a, and placed in a petri dish containing water at 50 c, and it was found that different gel blocks could be adhered to each other.
After the body gel of the supramolecular gel particles is cut into two parts from the middle as shown in b and c in figure 1, the two parts of gel are placed in a culture dish containing water at 50 ℃ for 2 hours, the two pieces of gel are bonded together, and the cross section bonding part has strong tensile resistance and pressure resistance.
2. Taking the deep profile control and then bonding supramolecular gel particles prepared in the example 2 as an example, the performance of the supramolecular gel particles is tested, and specifically:
as shown in fig. 2, which is a graph showing the initial particle size distribution of the prepared supramolecular gel particles, it can be seen from the graph in fig. 2 that the gel particle size exhibits polydispersity, indicating that the shapes and sizes are different, and the average particle size is about 275 nm.
3. The performance of the re-bonded supramolecular gel particles prepared in example 2 and the conventional gel particles prepared in comparative example one were tested, in particular:
the viscosity shear-recovery performance of supramolecular gel particles versus conventional gel particles is shown in fig. 3. Firstly, weighing the same mass of conventional gel particles and supramolecular gel particles into distilled water, and transferring the gel particles into a constant-temperature drying box at 60 ℃ to be sealed, kept stand and expanded for 24 hours. The same volume of the lower gel particle solution was then taken and the shear-recovery properties of the two gel particles were tested with the aid of a flat panel test system of the antopa MCR301 rheometer.The test parameters were 0.047mm height between the fixed plates, and the shear rate was varied from 0.1s -1 Increased to 1000s -1 Then 1000s again -1 Reduced to 0.1s -1 The total test time is 1200s, and the comparison is 0.1s after the two-end shearing process -1 The lower the viscosity loss of the gel particle solution, the smaller the loss, the stronger the shear-recovery capability of the particle.
It can be seen that the viscosity loss rate of the supramolecular gel particles with the re-bonding characteristic before and after shearing is 29.29%, while the viscosity loss rate of the conventional gel particles before and after shearing is 94.57%, and the supramolecular gel particles prepared by the invention have excellent shearing-recovery capability. The supermolecular gel particle structure contains a subject-guest recognition non-covalent cross-linking structure, and the cross-linking structure can be spontaneously recovered through the subject-guest recognition effect after high-speed shear failure, so that the supermolecular gel particle structure has excellent shear recovery and re-bonding characteristics; and the conventional gel particle structure only contains a covalent crosslinking structure, and the crosslinking structure can not be recovered after high-speed shearing damage, so that the viscosity shearing loss is serious.
FIG. 3 viscosity shear-recovery Performance of supramolecular gels prepared in accordance with the present invention (in contrast to conventional gel particles)
4. The performance of the re-bonded supramolecular gel particles prepared in examples 1-3 and the conventional gel particles prepared in comparative example 1 was tested, specifically:
the tensile and re-adhesive properties of the supramolecular gel particle bulk gel and the conventional gel particle bulk gel are shown in table 1. Cutting the body gel prepared by the polymerization reaction into rubber blocks with the diameter of 1cm and the initial length of 4cm, testing the length of the rubber blocks stretched to break at room temperature by using a manual stretching method, and recording the length as the stretching length, wherein the stretching rate is the ratio of the stretching length to the initial length; and placing the rubber block after the tensile fracture in a culture dish containing water, testing the length of the rubber block after the rubber block is stretched to the fracture at room temperature by using the same method and recording the length as the re-bonding stretching length after the rubber block is placed for 12 hours by using the re-bonding characteristic, wherein the re-bonding stretching rate is the ratio of the re-bonding stretching length to the initial length. It can be seen that the supramolecular gel prepared by the invention has excellent tensile property and re-bonding property compared with the conventional gel.
TABLE 1 stretching and Re-bonding Properties of supramolecular gel particle bulk gels and conventional gel particle bulk gels
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. The deep profile control and re-bonding supramolecular gel particles are characterized by comprising the following raw materials in percentage by weight: 10% -30% of acrylamide monomer; 10-20% of acrylic monomer; 0.1 to 5 percent of main body identification functional monomer; 0.1 to 5 percent of object recognition functional monomer; 0.01 to 0.5 percent of cross-linking agent; 0.01 to 1.0 percent of initiator; 0.1 to 1.0 percent of stabilizer; the balance of water, the weight of each raw material is 100 percent;
the main body recognition function unit includes: any one of allyl-alpha-cyclodextrin, allyl-beta-cyclodextrin and allyl-gamma-cyclodextrin;
the object recognition functional monomer comprises: one or a combination of two or more of dimethylallyl quaternary ammonium salt, styrene, acrylamide-N-adamantane and acrylamide-N-cycloalkane.
2. The deep profile-modified recoupling supramolecular gel particle of claim 1, wherein the crosslinker is N, N-methylenebisacrylamide or ethylene glycol dimethacrylate.
3. The deep profile-modified rebonded supramolecular gel particle of claim 1, wherein the initiator is ammonium persulfate or potassium persulfate.
4. The deep profile-controlled readhesive supramolecular gel particle of claim 1, wherein the stabilizing agent is at least one of ethylenediaminetetraacetic acid disodium salt, sodium citrate, sodium lactate.
5. The deep profile-modified rebonded supramolecular gel particle of claim 1, wherein the water is distilled or deionized water.
6. A method for the preparation of deep profile-modified recoupling supramolecular gel particles as claimed in any of claims 1 to 5, comprising:
sequentially adding an acrylamide monomer, an acrylic acid monomer, a host recognition functional monomer and an object recognition functional monomer into a water phase in an inert atmosphere, uniformly mixing, and adjusting the pH value to 5.0-8.5; then adding a cross-linking agent and a stabilizing agent, and uniformly mixing; adding an initiator, and uniformly mixing to obtain a water phase solution;
heating the aqueous phase solution to initiate polymerization reaction to obtain gel;
preparing the gel into particles to obtain the product.
7. The method for preparing supramolecular gel particles through deep profile control and re-bonding of claim 6, wherein a pH value regulator is adopted to regulate the pH value, and the pH value regulator is at least one of sodium hydroxide, potassium hydroxide, sodium carbonate and triethylamine.
8. The method for preparing deep profile-control re-binding supramolecular gel particles according to claim 6, wherein the polymerization conditions are: standing and polymerizing for 0.5-4h at 40-70 ℃.
9. The method for preparing supramolecular gel particles through deep profile control and re-bonding as claimed in claim 6, wherein the gel is cut into pieces, dried and ground at 40-80 ℃, and nano-sized to millimeter-sized particles are screened to obtain the target supramolecular gel particles.
10. The method for preparing deep profile control rebonded supramolecular gel particles according to claim 6, wherein the deep profile control rebonded supramolecular gel particles are used for deep profile control of fractured reservoirs, comprising:
dispersing the re-bonded supramolecular gel particles into injection fluid, adding the deep profile control re-bonded supramolecular gel particles with the concentration of 500-3000mg/L, uniformly mixing, and pumping into the stratum.
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