CN114957550B - Deep profile control and re-adhesion supermolecule gel particles and preparation method thereof - Google Patents
Deep profile control and re-adhesion supermolecule gel particles and preparation method thereof Download PDFInfo
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Abstract
The application belongs to the technical field of agents for profile control and water shutoff of oil fields, and provides deep profile control and adhesion supermolecule 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 acid monomer; 0.1% -5% of main body recognition functional monomer; 0.1% -5% of guest recognition functional monomer; 0.01% -0.5% of cross-linking agent; initiator 0.01% -1.0%; 0.1% -1.0% of stabilizer; the balance of the aqueous phase. The application also provides a preparation method and application of the supermolecule gel particles. The supermolecular gel particles prepared by the method are used for deep profile control of a fractured reservoir, are injected into a stratum in the form of particles, and have the characteristic of re-adhesion recovery after rapid injection and stratum migration and fracture, so that the purpose of effectively plugging deep cracks is achieved.
Description
Technical Field
The application 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 adhesion supermolecule gel particles, which are particularly applied to low-permeability fractured reservoirs.
Background
The disclosure of this background section is only intended to increase the understanding of the general background of the application and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art already known to those of ordinary skill in the art.
In recent years, with the continuous deep development of oil fields, the heterogeneity of oil reservoirs is stronger, residual oil is widely distributed, flooding and water channeling phenomena are serious, injected fluid is not circulated effectively, and the conventional polymer gel profile control means are difficult to realize effective plugging. Research shows that the pre-crosslinked gel particles have good effects on deep profile control of oil fields with large pore canals, and have strong heterogeneity and high water content. Because gel particles have certain deformability after absorbing water and expanding, the gel particles can move into the deep of the stratum through deformation under certain pressure difference, the particles are continuously absorbed and expanded and are retained in large pore channels to block the large pore channels due to gradual reduction of stratum pressure in the deep of the stratum, and the permeability of the stratum is adjusted to play a role in diversion of deep liquid flow. The gel particles have simple preparation process and good stability in the use process, and the defects of poor underground gel forming effect and limited plugging effect of the traditional gel plugging agent are avoided.
The prior pre-crosslinked gel particle profile control technology has better effect in reducing water channeling of old oil fields and improving crude oil recovery ratio, but along with popularization and application of gel particles, some technical defects and application limitations are also revealed. For example, in the field injection construction and in the complex deep migration process of oil reservoirs, gel particles which fully absorb water and expand are broken due to shearing and extrusion, and are easily flushed and produced by subsequent injection fluid, so that the problems of unstable crack plugging capability and poor deep profile control effect and the like are caused.
Disclosure of Invention
In order to solve the problems, the application provides a preparation method of a deep profile control supermolecule gel particle capable of being bonded again after being crushed, and the gel particle can generate the effects of dynamic and reversible recovery of a structure and mutual re-bonding through the effect of identifying supermolecules of a host and a guest after being rapidly injected and crushed by stratum migration, so that the high-strength crack plugging capability of the gel particle is ensured, and the effect of efficient deep profile control of a fractured reservoir is achieved.
In order to achieve the above purpose, the present application adopts the following technical scheme:
the application provides a deep profile control and bonding supermolecule gel particle, which comprises the following raw materials in percentage by weight: 10% -30% of acrylamide monomer; 10% -20% of acrylic acid monomer; 0.1% -5% of main body recognition functional monomer; 0.1% -5% of guest recognition functional monomer; 0.01% -0.5% of cross-linking agent; initiator 0.01% -1.0%; 0.1% -1.0% of stabilizer; the balance of water, wherein the weight of each raw material is 100%;
the main body recognition function monomer includes: any one of allyl-alpha-cyclodextrin, allyl-beta-cyclodextrin and allyl-gamma-cyclodextrin;
the object recognition functional monomer includes: one or more of dimethylallyl quaternary ammonium salt, styrene, acrylamide-N-adamantane and acrylamide-N-naphthene.
The second aspect of the present application provides a preparation method of the deep profile control and readhesion supramolecular gel particles, which comprises the following steps:
sequentially adding an acrylamide monomer, an acrylic acid monomer, a main body recognition function monomer and a guest recognition function monomer into a water phase in an inert atmosphere, uniformly mixing, and regulating the pH value to be 5.0-8.5; then adding a cross-linking agent and a stabilizing agent, and uniformly mixing; then 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 gel.
The beneficial effects of the application are that
(1) According to the application, the main body identification monomer and the object identification monomer are introduced into the main chain of the internal structure of the polymer gel particles, the characteristics of shearing and crushing the synthesized gel particles and then adhering are endowed by the action of the main object identification supermolecule, and the prepared gel particle deep profile control agent has good plugging capability on cracks and strong flushing resistance, and can be used as an excellent fractured oil reservoir profile control agent.
(2) Because the main body recognition monomer and the object recognition monomer in the gel particle structure are on the same polymer molecular chain, the problem of adsorption difference between the main body group and the object group generated by the multi-molecular chain can be greatly reduced when the gel particle structure is transported in a stratum porous medium, so that the main body recognition supermolecule effect in deep cracks is improved, and the re-adhesion performance of the supermolecule gel particles is enhanced.
(3) The synthesized supermolecular gel particles contain chemical agents required by crosslinking and re-adhesion, and are injected and transported in the stratum only in one form of solid particles, and all components are contained in the particles, so that the problems of incapability of forming glue or low quality of forming glue caused by dilution and shearing degradation of stratum water in the transportation process of a conventional underground crosslinking system in the stratum are avoided. The plugging capability and the profile control effect on deep cracks are improved.
(4) The supermolecular gel particles designed by the application can properly reduce the content of water-swelling monomers (acrylamide and acrylic acid), and even if the size of the water-swelling monomers is insufficient after the gel particles enter a deep stratum, the gel particles can be further aggregated to increase the size through a re-bonding effect, so that the problem of particle breakage caused by shearing is reduced while the effective blocking of deep cracks is ensured.
(5) The particle size of the supermolecule intelligent gel particles designed by the application can be adjusted according to the oil reservoir conditions, and the particle size is nano-scale, micro-scale or millimeter-scale, and the applicability is strong. And can also be used for deep profile control of fractured reservoirs.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application.
FIG. 1 shows the macroscopic adhesive properties of the supramolecular gel with readhesion prepared in example 1 of the present application (red and blue patches are dyed with different colorants respectively);
FIG. 2 is a graph showing the initial particle size distribution of supramolecular gel particles prepared in example 2 of the present application;
FIG. 3 is a graph showing the viscosity shear-recovery properties (as compared to conventional gel particles) of the supramolecular gel prepared in example 2 of the present application.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the application. 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.
The preparation method of deep profile control and re-adhesion supermolecule gel particles comprises the following raw materials in percentage by mass:
10% -30% of acrylamide monomer; 10% -20% of acrylic acid monomer; 0.1% -5% of main body recognition functional monomer; 0.1% -5% of guest recognition functional monomer; 0.01% -0.5% of cross-linking agent; initiator 0.01% -1.0%; 0.01% -1.0% of stabilizer; the balance of the aqueous phase.
In some embodiments, the subject identification function monomer includes: any one of allyl-alpha-cyclodextrin, allyl-beta-cyclodextrin and allyl-gamma-cyclodextrin; allyl-beta-cyclodextrin is preferred.
In some embodiments, the guest recognition functional monomer comprises: one or more of dimethylallyl quaternary ammonium salt, styrene, acrylamide-N-adamantane and acrylamide-N-naphthene.
In some embodiments, the crosslinking agent comprises N, N-methylenebisacrylamide, 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 stabilizer comprises at least one of disodium ethylenediamine tetraacetate, 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 adding an acrylamide monomer, an acrylic acid monomer, a main body recognition function monomer and a guest recognition function monomer into the water phase in sequence under the stirring condition, stirring until the solution becomes clear, and regulating 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 at 40-70 ℃ for 0.5-4h, and reacting to obtain gel; then cutting the gel, drying and grinding at 40-80 ℃, and screening out nano-scale to millimeter-scale particles to obtain the target supermolecule gel particles.
In some embodiments, the pH adjustor is at least one of sodium hydroxide, potassium hydroxide, sodium carbonate, and triethylamine.
The application also provides application of the deep profile control and re-adhesion supermolecule gel particles in deep profile control of fractured reservoirs, and the specific application method is as follows:
adding deep profile control and then adhesion supermolecule gel particles into injection fluid, adding the mixture with the concentration of 500-3000mg/L, stirring uniformly, and pumping into stratum.
The application will now be described in further detail with reference to the following specific examples, which should be construed as illustrative rather than limiting.
Example 1
Preparation method of deep profile control and re-adhesion supermolecule gel particles
(1) Raw materials: 17.82g of acrylamide monomer; 9.4112g of a main body identification functional monomer; 2.7672g of a guest recognition functional monomer; 0.02056g of cross-linking agent; initiator 0.285g; 69.511g of distilled water. Wherein: the main body recognition functional monomer is allyl-beta-cyclodextrin; the guest identification 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 content, sequentially adding into a beaker containing distilled water while stirring, and stirring until the solution becomes clear; n, N-methylenebisacrylamide was then added to the above solution and stirred until all dissolved. Finally adding ammonium persulfate solution, stirring for 30min, and ultrasonically oscillating for 10min (power 80W) to remove air in the solution, so as to prepare the uniformly dispersed aqueous phase solution. The aqueous phase solution is placed in a constant temperature water bath kettle at 40 ℃ for polymerization reaction for 2 hours and then taken out. Cutting the obtained gel into blocks, washing with distilled water for 4 times, drying in a constant temperature drying oven at 60 ℃ for 12 hours, taking out, grinding with a planetary ball mill at 500r/min for 4 hours, and preparing nano-scale particles to obtain the target supermolecule gel particles.
Example 2:
a method for preparing deep profile control and re-adhesion supermolecular gel particles is different from example 1 in that the amount of cross-linking agent is changed.
(1) Raw materials: 17.82g of acrylamide monomer; 9.4112g of a main body identification functional monomer; 2.7672g of a guest recognition functional monomer; 0.12336g of cross-linking agent; initiator 0.285g; 69.511g of distilled water. Wherein: the main body recognition functional monomer is allyl-beta-cyclodextrin; the guest identification 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 supermolecule gel particle deep profile control agent is as described in example 1.
Example 3:
a method for preparing deep profile control and re-adhesion supermolecular gel particles is different from example 1 in that acrylic acid 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 a main body identification functional monomer; 2.7672g of a guest recognition functional monomer; 0.02056g of cross-linking agent; initiator 0.285g; 69.511g of distilled water. Wherein: the main body recognition functional monomer is allyl-beta-cyclodextrin; the guest identification 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 deep profile control agent for the supramolecular gel particles is as described in example 1, and only the polymerization temperature is changed to 50 ℃.
Example 4:
the preparation method of deep profile control and re-adhesion supermolecular gel particles is different from that in example 1 in that the guest recognition functional monomer is changed into acrylamide-N-adamantane and the quality of various raw materials is changed.
(1) Raw materials: 18.515g of acrylamide monomer; 9.778g of a main body identification functional monomer; 1.706g of a guest recognition functional monomer; 0.02056g of cross-linking agent; initiator 0.285g; 69.695g of distilled water. Wherein: the main body recognition functional monomer is allyl-beta-cyclodextrin; the guest identification 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 into a beaker containing distilled water while stirring, and stirring until the solution becomes clear; n, N-methylenebisacrylamide was then added to the above solution and stirred until all dissolved. Finally adding ammonium persulfate solution, stirring for 30min, and ultrasonically oscillating for 10min (power 80W) to remove air in the solution, so as to prepare the uniformly dispersed aqueous phase solution. The aqueous phase solution is placed in a constant temperature water bath kettle at 50 ℃ and taken out after 2h of reaction. Cutting the obtained gel into blocks, washing with distilled water for 4 times, drying in a constant temperature drying oven at 60 ℃ for 12 hours, taking out, grinding with a planetary ball mill at 500r/min for 4 hours, and sieving out nano-scale to millimeter-scale particles to obtain the target supermolecule gel particles.
Example 5:
the preparation method of deep profile control and re-adhesion supermolecular gel particles is different from that of the embodiment 1 in that the guest identification functional monomer is changed into styrene and the quality of various raw materials is changed.
(1) Raw materials: 19.356g of acrylamide monomer; 9.778g of a main body identification functional monomer; 0.865g of a guest recognition functional monomer; 0.02056g of cross-linking agent; initiator 0.285g; 69.695g of distilled water. Wherein: the main body recognition functional monomer is allyl-beta-cyclodextrin; styrene is selected as the guest identification functional monomer; 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 into a beaker containing distilled water while stirring, and stirring until the solution becomes clear; n, N-methylenebisacrylamide was then added to the above solution and stirred until all dissolved. Finally adding ammonium persulfate solution, stirring for 30min, and ultrasonically oscillating for 10min (power 80W) to remove air in the solution, so as to prepare the uniformly dispersed aqueous phase solution. The aqueous phase solution is placed in a constant temperature water bath kettle at 50 ℃ and taken out after 2h of reaction. Cutting the obtained gel into blocks, washing with distilled water for 4 times, drying in a constant temperature drying oven at 60 ℃ for 12 hours, taking out, grinding with a planetary ball mill at 500r/min for 4 hours, and sieving out nano-scale to millimeter-scale particles to obtain the target supermolecule gel particles.
Example 6:
the preparation method of deep profile control and re-adhesion supermolecular gel particles is different from that in the embodiment 1 in that the main body recognition functional monomer is changed into allyl-alpha-cyclodextrin and the quality of various raw materials is changed.
(1) Raw materials: 18.8013g of acrylamide monomer; 8.4299g of a main body identification functional monomer; 2.7672g of a guest recognition functional monomer; 0.02056g of cross-linking agent; initiator 0.285g; 69.511g of distilled water. 18.515g of acrylamide monomer; 9.778g of a main body identification functional monomer; 1.706g of a guest recognition functional monomer; 0.02056g of cross-linking agent; initiator 0.285g; 69.695g of distilled water. Wherein: the main body recognition functional monomer is allyl-alpha-cyclodextrin; the guest identification 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 content, sequentially adding into a beaker containing distilled water while stirring, and stirring until the solution becomes clear; n, N-methylenebisacrylamide was then added to the above solution and stirred until all dissolved. Finally adding ammonium persulfate solution, stirring for 30min, and ultrasonically oscillating for 10min (power 80W) to remove air in the solution, so as to prepare the uniformly dispersed aqueous phase solution. The aqueous phase solution is placed in a constant temperature water bath kettle at 40 ℃ for polymerization reaction for 2 hours and then taken out. Cutting the obtained gel into blocks, washing with distilled water for 4 times, drying in a constant temperature drying oven at 60 ℃ for 12 hours, taking out, grinding with a planetary ball mill at 500r/min for 4 hours, and preparing nano-scale particles to obtain the target supermolecule gel particles.
Example 7:
the preparation method of deep profile control and re-adhesion supermolecular gel particles is different from that in the embodiment 1 in that the main body recognition functional monomer is changed into allyl-gamma-cyclodextrin and the quality of various raw materials is changed.
(1) Raw materials: 16.5225g of acrylamide monomer; 10.7087g of a main body identification functional monomer; 2.7672g of a guest recognition functional monomer; 0.02056g of cross-linking agent; initiator 0.285g; 69.511g of distilled water. 18.515g of acrylamide monomer; 9.778g of a main body identification functional monomer; 1.706g of a guest recognition functional monomer; 0.02056g of cross-linking agent; initiator 0.285g; 69.695g of distilled water. Wherein: the main body recognition functional monomer is allyl-alpha-cyclodextrin; the guest identification 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 content, sequentially adding into a beaker containing distilled water while stirring, and stirring until the solution becomes clear; n, N-methylenebisacrylamide was then added to the above solution and stirred until all dissolved. Finally adding ammonium persulfate solution, stirring for 30min, and ultrasonically oscillating for 10min (power 80W) to remove air in the solution, so as to prepare the uniformly dispersed aqueous phase solution. The aqueous phase solution is placed in a constant temperature water bath kettle at 40 ℃ for polymerization reaction for 2 hours and then taken out. Cutting the obtained gel into blocks, washing with distilled water for 4 times, drying in a constant temperature drying oven at 60 ℃ for 12 hours, taking out, grinding with a planetary ball mill at 500r/min for 4 hours, and preparing nano-scale particles to obtain the target supermolecule gel particles.
Comparative example 1:
a deep profile control conventional gel particle profile control agent as described in embodiment one, except that it 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 0.1425g; 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 containing distilled water while stirring, and stirring until the solution becomes clear; n, N-methylenebisacrylamide was then added to the above solution and stirred until all dissolved. Finally adding ammonium persulfate solution, stirring for 30min, and ultrasonically oscillating for 10min (power 80W) to remove air in the solution, so as to prepare the uniformly dispersed aqueous phase solution. The aqueous phase solution is placed in a constant temperature water bath kettle at 50 ℃ and taken out after 2h of reaction. Cutting the obtained gel into blocks, washing with distilled water for 4 times, drying in a constant temperature drying oven at 60 ℃ for 12 hours, taking out, grinding with a planetary ball mill at 500r/min for 4 hours, and sieving out nano-scale to millimeter-scale particles to obtain the target conventional gel particles.
Performance test:
1. taking deep profile control and then adhesion of supermolecule gel particles prepared in example 1 as an example, the performance of the supermolecule gel particles is tested, specifically:
as shown in FIG. 1 a, the bulk gel of the prepared supramolecular gel particles was stained with red and blue, respectively, and placed in an aqueous petri dish at 50℃and the different gel pieces were found to adhere to each other.
As shown in fig. 1 b and c, after the bulk gel of the supramolecular gel particles is cut into two parts from the middle, the two parts are placed in a water-containing culture dish for 2 hours at 50 ℃, the two parts of gel are mutually bonded, and the section bonding part has stronger stretching resistance and compression resistance.
2. Taking deep profile control and then adhesion of supermolecule gel particles prepared in example 2 as an example, the performance of the supermolecule gel particles is tested, specifically:
as shown in FIG. 2, the initial particle size distribution curve of the prepared supramolecular gel particles is shown, and as can be seen from the curve in FIG. 2, the gel particles show polydispersities, which indicate that the gel particles have different shapes and sizes, and the average particle size is about 275nm.
3. Taking the re-adhered supramolecular gel particles prepared in example 2 and the conventional gel particles prepared in comparative example one as examples, their properties, in particular, were tested:
the viscosity shear-recovery performance versus conventional gel particles for supramolecular gel particles is shown in fig. 3. Firstly, respectively weighing conventional gel particles and supermolecule gel particles with the same mass into distilled water, transferring into a constant temperature drying oven at 60 ℃, sealing, standing and expanding for 24 hours. The same volume of the lower gel particle solution was then taken and the shear-recovery properties of both gel particles were tested with the aid of a flat panel test system of a An Dongpa MCR301 rheometer. The test parameters were a height between fixed plates of 0.047mm, and the shear rate was varied from 0.1s -1 Increased to 1000s -1 Then from 1000s -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 is, indicating a stronger shear-recovery capability of the particles.
It can be seen that the viscosity loss rate of the supramolecular gel particles with re-bonding characteristics prepared by the method is 29.29% before and after shearing, and the viscosity loss rate of the supramolecular gel particles prepared by the method is 94.57% before and after shearing, and the supramolecular gel particles prepared by the method have excellent shearing-recovering capability. The supermolecular gel particle structure contains a main guest identification noncovalent crosslinking structure, and the crosslinking structure can be spontaneously recovered through the main guest identification after high-speed shearing damage, so that the supermolecular gel particle structure has excellent shearing recovery and re-adhesion characteristics; the conventional gel particle structure only contains a covalent cross-linking structure, and the cross-linking structure cannot be recovered after high-speed shearing damage, so that the viscosity shearing loss is serious.
FIG. 3 shear-recovery properties of the supramolecular gel prepared according to the present application (in contrast to conventional gel particles)
4. Taking the re-adhered supramolecular gel particles prepared in examples 1-3 and the conventional gel particles prepared in comparative example 1 as examples, their properties, in particular, were tested:
the tensile and readhesion performance results of the supramolecular gel particle bulk gels and the conventional gel particle bulk gels are shown in table 1. Cutting the body gel prepared by the polymerization reaction into gel blocks with the diameter of 1cm and the initial length of 4cm, testing the length of the gel blocks when the gel blocks are stretched to fracture at room temperature by using a manual stretching method, and marking the length as the stretching length, wherein the stretching rate is the ratio of the stretching length to the initial length; placing the glue block after stretching and breaking in a water-containing culture dish, and testing the length of the glue block after stretching and breaking at room temperature by adopting the same method after placing for 12 hours by utilizing the re-bonding property of the glue block, wherein the length of the glue block after stretching and breaking is recorded as the re-bonding stretching length, and 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 application has excellent tensile property and re-adhesion property compared with the conventional gel.
TABLE 1 tensile and readhesion Properties of supramolecular gel particle bulk gels and conventional gel particle bulk gels
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (5)
1. The deep profile control and re-adhesion supermolecule gel particle is characterized by comprising the following raw materials: 17.82g of acrylamide monomer; 9.4112g of a main body identification functional monomer; 2.7672g of a guest recognition functional monomer; 0.02056g of cross-linking agent; initiator 0.285g; 69.511g of distilled water;
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 deep profile control and re-adhesion supermolecule gel particle is characterized by comprising the following raw materials: 8.91g of acrylamide monomer; 8.91g of acrylic monomer; 9.4112g of a main body identification functional monomer; 2.7672g of a guest recognition functional monomer; 0.02056g of cross-linking agent; initiator 0.285g; 69.511g of distilled water;
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.
3. A method of preparing deep profile control re-bonding supramolecular gel particles as claimed in claim 1, comprising:
respectively weighing the acrylamide, the allyl-beta-cyclodextrin and the hexadecyl dimethyl allyl ammonium chloride in the amount of claim 1, sequentially adding the acrylamide, the allyl-beta-cyclodextrin and the hexadecyl dimethyl allyl ammonium chloride into a beaker containing distilled water while stirring, and stirring until the solution becomes clear; then adding N, N-methylene bisacrylamide into the solution, and stirring until the N, N-methylene bisacrylamide is completely dissolved; finally adding ammonium persulfate solution, stirring for 30min, performing ultrasonic oscillation for 10min, and removing air in the solution to prepare uniformly dispersed aqueous phase solution with power of 80W; placing the aqueous phase solution in a constant temperature water bath kettle at 40 ℃, and taking out after polymerization for 2 hours; cutting the obtained gel into blocks, washing with distilled water for 4 times, drying in a constant temperature drying oven at 60 ℃ for 12 hours, taking out, grinding with a planetary ball mill at 500r/min for 4 hours, and preparing nano-scale particles to obtain the target supermolecule gel particles.
4. A method of preparing deep profile control re-bonding supramolecular gel particles as claimed in claim 2, comprising:
respectively weighing the acrylamide, the allyl-beta-cyclodextrin and the hexadecyl dimethyl allyl ammonium chloride in the amount of claim 2, sequentially adding the acrylamide, the allyl-beta-cyclodextrin and the hexadecyl dimethyl allyl ammonium chloride into a beaker containing distilled water while stirring, and stirring until the solution becomes clear; then adding N, N-methylene bisacrylamide into the solution, and stirring until the N, N-methylene bisacrylamide is completely dissolved; finally adding ammonium persulfate solution, stirring for 30min, performing ultrasonic oscillation for 10min, and removing air in the solution to prepare uniformly dispersed aqueous phase solution with power of 80W; placing the aqueous phase solution in a constant temperature water bath kettle at 50 ℃, and taking out after polymerization for 2 hours; cutting the obtained gel into blocks, washing with distilled water for 4 times, drying in a constant temperature drying oven at 60 ℃ for 12 hours, taking out, grinding with a planetary ball mill at 500r/min for 4 hours, and preparing nano-scale particles to obtain the target supermolecule gel particles.
5. The deep profile control and readhesion supermolecular gel particles according to any one of claims 1-2 or the deep profile control and readhesion supermolecular gel particles prepared by the preparation method according to any one of claims 3-4, for use in deep profile control of a fractured reservoir, comprising:
dispersing the re-bonded supermolecular gel particles in injection fluid, adding the deep profile control re-bonded supermolecular gel particles with the concentration of 500-3000mg/L, uniformly mixing, and pumping into stratum.
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