In-situ self-growing dispersion glue system and preparation method and injection process thereof

Abstract

The invention discloses an in-situ self-growing dispersion glue system as well as a preparation method and an injection process thereof, and belongs to the technical field of oil exploitation. The preparation method comprises the following steps: S1, preferably selecting an emulsifier; s2, preferably selecting a dispersion glue system of which the steering pressure is not lower than a threshold value and the stabilization time is not lower than 6 months under the conditions of oil reservoir temperature and mineralization degree; s3, light crude oil with the viscosity smaller than 50 mPa.s is selected; s4, according to the target plugging particle size of the target oil reservoir, the dosage of the emulsifier, the dosage of the dispersion glue system and the dosage of the light crude oil are optimized; s5, adding the loose glue system into water to obtain a stably dispersed water phase system; s6, mixing the light crude oil with the water phase system, and stirring in a nitrogen environment to obtain the in-situ self-growing dispersion glue system; the injection process mainly comprises the step of injecting the in-situ self-growing dispersion glue system into a stratum. By combining the preparation method and the injection process, the deep regulation and control effect of the in-situ dispersion glue system can be realized, and the water-drive oil reservoir production is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of oil extraction, and in particular to an in-situ self-growing dispersed colloid system and a preparation method and injection process thereof. Background Art

[0002] Dispersed rubber particles have the advantages of low dosage, deep injection, and heterogeneous discontinuous profile control, which make them have significant advantages in large well spacing profile control applications. However, due to factors such as the expansion rate of dispersed rubber particles, there are migration problems in large well spacing (350m ~ 400m) and long-distance transmission, making it difficult to achieve deep profile control for large well spacing, thus limiting its potential for water control and oil increase in large well spacing. Therefore, some scholars have developed dispersed rubber particles with low expansion rate from the perspective of expansion rate, but this also increases the particle size, making it difficult to achieve deep and efficient plugging. Therefore, the development of a dispersed rubber particle with excellent transmission is of great significance to improving the recovery of large well spacing water drive reservoirs. Summary of the invention

[0003] In view of the above problems, the present invention aims to provide an in-situ self-growing dispersed colloid system and a preparation method and injection process thereof.

[0004] The technical solution of the present invention is as follows: In one aspect, a method for preparing an in-situ self-growing dispersed colloid system is provided, comprising the following steps: S1: preferably an emulsifier capable of forming a stable water-in-oil emulsion; S2: preferably a dispersoid system with a steering pressure not lower than a threshold value and a stability time of not less than 6 months under reservoir temperature and salinity conditions, and the dispersoid system includes the emulsifier; S3: Select light crude oil with a viscosity of less than 50 mPa·s; S4: Optimizing the dosage of the emulsifier, dispersoid system and light crude oil according to the target plugging particle size of the target oil reservoir; S5: adding the dispersoid system into water to obtain a dispersed and stable aqueous phase system; S6: Mixing the light crude oil with the water phase system, and stirring in a nitrogen environment to obtain the in-situ self-growing dispersed colloid system.

[0005] Preferably, in step S1, the emulsifier includes any one or more of a nonionic emulsifier, an anionic emulsifier, a cationic emulsifier, an amphiphilic surfactant and modified amphiphilic nanoparticles.

[0006] Preferably, the nonionic emulsifier is any one or more of Span 80, Span 85, monoglyceride, diglyceride, polyoxyethylene and its derivatives, polyoxypropylene and its derivatives, and lecithin.

[0007] Preferably, the anionic emulsifier is any one or more of sodium stearate, sodium laurate and sodium dodecylbenzene sulfonate.

[0008] Preferably, the cationic emulsifier is hexadecyltrimethylammonium bromide.

[0009] Preferably, the amphiphilic surfactant is any one or more of anionic amphiphilic surfactant, cationic amphiphilic surfactant and nonionic amphiphilic surfactant.

[0010] Preferably, the nanoparticles modified by the modified amphiphilic nanoparticles are any one of nano-silicon dioxide, nano-aluminum oxide, nano-iron oxide and carbon nanotubes.

[0011] Preferably, in step S2, the dispersoid system further comprises a water-soluble functional monomer, a cross-linking agent and an initiator.

[0012] Preferably, the water-soluble functional monomer is any one or more of acrylamide, N-vinyl pyrrolidone, 3-methacrylamide dopamine, acrylic acid, vinyl alcohol, methacrylic acid, polyvinyl alcohol and polyvinyl alcohol.

[0013] Preferably, the cross-linking agent is any one or more of a multifunctional monomer, an aldehyde cross-linking agent and an isocyanate cross-linking agent.

[0014] Preferably, the multifunctional monomer is any one or more of allyl melamine, N,N'-methylenebisacrylamide, tetravinylcyclotetrasiloxane and phenyltrichlorosilane; the aldehyde crosslinking agent is formaldehyde and / or valeraldehyde; and the isocyanate crosslinking agent is vinyl diisocyanate and / or triisocyanate.

[0015] Preferably, the initiator is any one or more of a peroxide initiator, an azo compound initiator, a fluoride initiator and a chloride initiator; the peroxide initiator is dibenzoyl peroxide and / or hydrogen peroxide; the azo compound initiator is azobisisobutyronitrile and / or azodifluoropropionic acid; the fluoride initiator is ammonium fluoride; and the chloride initiator is sodium chloroacetate.

[0016] Preferably, the dispersoid system further comprises a deoxidizer and / or an inhibitor; the deoxidizer is sodium bisulfite; the inhibitor is any one or more of tert-N-phenylethyl-N-tetradecyl methacrylamide, butylphenol, nitrophenol, p-aminophenol and diethyl phthalate.

[0017] On the other hand, an in-situ self-growing dispersed colloid system is also provided, which is prepared by any of the above-mentioned methods for preparing an in-situ self-growing dispersed colloid system.

[0018] On the other hand, there is also provided a process for injecting the above-mentioned in-situ self-growing dispersed colloid system, comprising the following steps: S1': Statistical analysis of the pore size of the target reservoir is performed to determine the particle size for plugging the pores; S2': Perform historical matching on the oil / water wells that need to be plugged to determine the current water saturation of their high-permeability channels; S3': based on the current water saturation and the particle size of the pores to be plugged, the concentration of each component in the in-situ self-growing dispersoid system is optimized according to the maximum particle size that can be formed by the in-situ self-growing dispersoid system in the reservoir; S4': Test the viscosity and plugging performance of the pre-emulsion of the selected in-situ self-growing dispersed colloid system through indoor experiments, and characterize the plugging mechanism of the selected in-situ self-growing dispersed colloid system based on CMG reservoir numerical simulation software; S5': Optimize the injection volume, injection system concentration and injection speed through CMG reservoir numerical simulation software to form an injection process plan, and inject into the target oil / water well according to the injection process plan.

[0019] Preferably, in step S1', mercury injection data or SEM data of reservoir cores are used to calculate the particle size distribution, and the average value of the maximum particle size accounting for 30% is selected as the particle size for plugging pores.

[0020] Preferably, in step S3', when optimizing the concentration of each component, the particle size distribution of the in-situ self-growing dispersed colloid system configured by the adopted concentration is between the target particle size and 1 / 3 of the target particle size.

[0021] Preferably, in step S4', when testing the viscosity of the pre-emulsion, measurements are performed at different times, the resistance coefficient is tested by a displacement experiment, and the core permeability and porosity used in the displacement experiment meet the target reservoir parameters; the change process of the pre-emulsion viscosity and the change of the in-situ dispersed glue plugging effect are characterized by a multi-component model and a reaction equation to form a fluid model that can characterize the plugging performance of the in-situ self-growing dispersed glue system.

[0022] Preferably, the different times refer to 0d, 3d, 5d, 10d, 20d, 30d to demulsification or gelation time.

[0023] Preferably, in step S5', the fitted geological model and the fluid model characterizing the plugging performance of the in-situ self-growing dispersed gel system are used to predict the effect of enhancing oil recovery under different process parameters, thereby forming an injection process plan.

[0024] The beneficial effects of the present invention are: The present invention can achieve deep control effect by combining the in-situ self-growing dispersed colloid system with the injection process, thereby greatly improving the recovery rate of water-driven oil reservoirs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 The design and injection process optimization flow chart of the in-situ self-growing dispersed colloid system of the present invention; Figure 2 A water saturation distribution diagram of an injection profile of an oil reservoir at the end of water flooding in a specific embodiment; Figure 3 It is a schematic diagram of the relationship between the permeability and the residual resistance coefficient over time in a specific embodiment; Figure 4 A schematic diagram of the concentration distribution of the in-situ self-grown dispersed gel system (EM1, EM2, EM3, EM4 and Gel1) at different injection stages in a specific embodiment; Figure 5 is a graph showing the relationship between injection volume and enhanced oil recovery in a specific embodiment; Figure 6 It is a relationship diagram between injection rate and enhanced oil recovery in a specific embodiment. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, in the absence of conflict, the embodiments in this application and the technical features in the embodiments can be combined with each other. It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as those generally understood by those of ordinary skill in the art to which this application belongs. The words "including" or "comprising" and the like used in the disclosure of the present invention mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0028] On the one hand, if Figure 1 As shown, the present invention provides a method for preparing an in-situ self-growing dispersed colloid system, comprising the following steps: S1: preferably an emulsifier capable of forming a stable water-in-oil emulsion.

[0029] In a specific embodiment, the stable water-in-oil emulsion refers to an oil-in-water emulsion that can maintain a 5-day demulsification rate of less than 10% under reservoir temperature and salinity conditions.

[0030] In a specific embodiment, the emulsifier includes any one or more of nonionic emulsifier, anionic emulsifier, cationic emulsifier, amphiphilic surfactant and modified amphiphilic nanoparticles. Optionally, the nonionic emulsifier adopts any one or more of Span 80, Span 85, monoglyceride, diglyceride, polyoxyethylene and its derivatives, polyoxypropylene and its derivatives and lecithin. Optionally, the anionic emulsifier adopts any one or more of sodium stearate, sodium laurate and sodium dodecylbenzene sulfonate. Optionally, the cationic emulsifier adopts hexadecyl trimethyl ammonium bromide. Optionally, the amphiphilic surfactant is any one or more of anionic amphiphilic surfactant, cationic amphiphilic surfactant and nonionic amphiphilic surfactant. Optionally, the nanoparticles modified by the modified amphiphilic nanoparticles are any one of nano silicon dioxide, nano aluminum oxide, nano iron oxide and carbon nanotubes.

[0031] S2: Preferably, the steering pressure is not less than the threshold value, the stability time of the dispersed colloid system is not less than 6 months under the conditions of reservoir temperature and salinity, and the dispersed colloid system includes the emulsifier.

[0032] In a specific embodiment, the dispersion system further includes a water-soluble functional monomer, a cross-linking agent and an initiator.

[0033] In a specific embodiment, the water-soluble functional monomer is any one or more of acrylamide, N-vinyl pyrrolidone, 3-methacrylamide dopamine, acrylic acid, vinyl alcohol, methacrylic acid, polyvinyl alcohol and polyvinyl alcohol.

[0034] In a specific embodiment, the crosslinking agent is any one or more of a multifunctional monomer, an aldehyde crosslinking agent and an isocyanate crosslinking agent. Optionally, the multifunctional monomer is any one or more of allyl melamine, N,N'-methylene bisacrylamide, tetravinyl cyclotetrasiloxane and phenyl trichlorosilane. Optionally, the aldehyde crosslinking agent is formaldehyde and / or valeraldehyde. Optionally, the isocyanate crosslinking agent is vinyl diisocyanate and / or triisocyanate.

[0035] In a specific embodiment, the initiator is any one or more of a peroxide initiator, an azo compound initiator, a fluoride initiator and a chloride initiator. Optionally, the peroxide initiator is dibenzoyl peroxide and / or hydrogen peroxide. Optionally, the azo compound initiator is azobisisobutyronitrile and / or azodifluoropropionic acid. Optionally, the fluoride initiator is ammonium fluoride. Optionally, the chloride initiator is sodium chloroacetate.

[0036] In a specific embodiment, the dispersoid system further comprises a deoxidizer and / or a polymerization inhibitor. Optionally, the deoxidizer is sodium bisulfite. Optionally, the polymerization inhibitor is any one or more of tert-N-phenylethyl-N-tetradecyl methacrylamide, butylphenol, nitrophenol, p-aminophenol and diethyl phthalate.

[0037] S3: Select light crude oil with a viscosity less than 50 mPa·s.

[0038] S4: Optimizing the dosage of the emulsifier, dispersoid system and light crude oil according to the target plugging particle size of the target oil reservoir.

[0039] In a specific embodiment, based on the maximum pore size of the target reservoir, a length between 1 / 3 and 1 times of the maximum pore size is taken as the optimized emulsion particle size range, and the emulsifier, dispersoid system and light crude oil dosage are preferably selected.

[0040] S5: adding the dispersoid system into water to obtain a dispersed and stable aqueous phase system.

[0041] S6: Mixing the light crude oil with the water phase system, and stirring in a nitrogen environment to obtain the in-situ self-growing dispersed colloid system.

[0042] In a specific embodiment, during stirring, the stirring speed is 200-6000 r / min.

[0043] On the other hand, the present invention further provides an in-situ self-growing dispersed colloid system, which is prepared by any of the above-mentioned methods for preparing an in-situ self-growing dispersed colloid system.

[0044] On the other hand, the present invention also provides an injection process of the above-mentioned in-situ self-growing dispersed colloid system, comprising the following steps: S1': Statistical analysis of the pore size of the target reservoir is performed to determine the particle size that can plug the pores.

[0045] In a specific embodiment, mercury injection data or SEM data of reservoir cores are used to calculate the particle size distribution, and the average value of the maximum particle size accounting for 30% is selected as the particle size for plugging pores.

[0046] S2': Perform historical matching on the oil / water wells that need to be plugged to clarify the current water saturation of their high permeability channels.

[0047] S3': Based on the current water saturation and the particle size of the pores to be plugged, the concentration of each component in the in-situ self-growing dispersoid system is optimized according to the maximum particle size that the in-situ self-growing dispersoid system can form in the reservoir.

[0048] In a specific embodiment, when optimizing the concentration of each component, the particle size distribution of the in-situ self-growing dispersed colloid system configured by the adopted concentration is between the target particle size and 1 / 3 of the target particle size.

[0049] S4': The viscosity and plugging performance of the pre-emulsion of the selected in-situ self-growing dispersed colloid system are tested by indoor experiments, and the plugging mechanism of the selected in-situ self-growing dispersed colloid system is characterized based on CMG reservoir numerical simulation software.

[0050] In a specific embodiment, when testing the viscosity of the pre-emulsion, measurements are taken at different times, the resistance coefficient is tested by displacement experiments, and the core permeability and porosity used in the displacement experiments meet the target reservoir parameters; the change process of the pre-emulsion viscosity and the change of the in-situ dispersed glue plugging effect are characterized by a multi-component model and reaction equation to form a fluid model that can characterize the plugging performance of the in-situ self-growing dispersed glue system. Optionally, the different times refer to 0d, 3d, 5d, 10d, 20d, 30d to demulsification or gelation time.

[0051] S5': Optimize the injection volume, injection system concentration and injection speed through CMG reservoir numerical simulation software to form an injection process plan, and inject into the target oil / water well according to the injection process plan.

[0052] In a specific embodiment, the fitted geological model and the fluid model characterizing the plugging performance of the in-situ self-growing dispersed gel system are used to predict the effect of improving the recovery rate under different process parameters, thereby forming an injection process plan.

[0053] In a specific embodiment, taking a typical loose sandstone reservoir at sea as an example, the method for preparing the in-situ self-growing dispersed colloid system of the present invention is used to prepare an in-situ self-growing dispersed colloid system suitable for the reservoir.

[0054] In this embodiment, taking the real light oil of a certain oil field as an example, its viscosity is 12.8 mPa·s, Span80 surfactant is selected as emulsifier based on low HBL value, and modified amphiphilic nanoparticles (SiO2) are selected together with emulsifier to form an emulsifier system. Based on the performance of high plugging strength and long gelation time, the dispersion glue system is selected, and the water-soluble functional monomers are selected as polyacrylamide, N-vinyl pyrrolidone and 3-methacrylamide dopamine, the crosslinking agent is N, N'-methylenebisacrylamide, the inhibitor is N-phenylethyl-N-tetradecyl methacrylamide, and the initiator is sodium chloroacetate. The final formula is: 9% polyacrylamide + 2% N-vinyl pyrrolidone + 0.5% 3-methacrylamide dopamine + 0.5% N-phenylethyl-N-tetradecyl methacrylamide + 0.7% MBA N, N'-methylenebisacrylamide.

[0055] The average pore size of the target reservoir in this example is 500 μm, so theoretically the target range of the in-situ dispersed colloidal particles is 167 μm to 500 μm. However, in this example, the mechanism model is used instead. At the end of water flooding, the water saturation distribution of the reservoir injection profile is as follows: Figure 2 As shown, when the water content is high, the water content of the high permeability layer reaches about 70-80%. It is believed that the water content of the formation can make the pre-emulsion solubilized until the internal phase volume reaches 80% water content. Therefore, based on the minimum emulsion particle size and the maximum internal phase water content as the target, that is, when the internal phase volume reaches 80% water content, the corresponding pre-emulsion particle size should be not less than 167μm. Based on the current particle size range, the dispersed colloid system is added to water to obtain a dispersed and stable aqueous phase system, and the light crude oil is mixed with the aqueous phase system, and stirred in a nitrogen environment to obtain the in-situ self-growing dispersed colloid system. Through long-term observation, it is found that in-situ particles are precipitated in the emulsion at 5d, and the dispersed colloid system is preferred. The final preferred emulsifier system concentration is 5%, and the in-situ self-growing dispersed colloid system concentration is 12%, and an in-situ self-growing dispersed colloid system suitable for the characteristics of the reservoir is obtained.

[0056] On this basis, the viscosity and plugging performance of the pre-emulsion of the in-situ self-growing dispersed adhesive system were tested, and the viscosity test results are shown in Table 1: Table 1 Viscosity variation of pre-emulsion systems prepared under different water contents

[0057] Based on the preferred in-situ self-growing dispersed colloid system, the plugging performance changes over time were tested by sand filling tube experiment. The plugging performance was characterized by residual resistance coefficient. The reservoir permeability is 1200~2000mD. The length of the sand filling tube is 60cm and the diameter is 2.5cm. The filling material is 40-60 mesh quartz sand. The water-tested permeability is 1750mD, which is consistent with the reservoir characteristics. After the water flooding is completed, the in-situ self-growing dispersed colloid system is injected and solidified for 24 hours. Then the permeability change is tested every other day and its residual resistance coefficient is calculated. Figure 3 The relationship between the residual resistance coefficient and the permeability over time is obtained, so as to clarify the plugging performance of the in-situ self-growing dispersed glue system over time. On this basis, the in-situ self-growing dispersed glue reaction component model is constructed, as shown in formula (1) 01 to formula (7): Emulsion solubilization reaction: (1) (2) (3) Dispersed rubber particle precipitation reaction: (4) Particles absorbing water and swelling reaction: (5) (6) (7) Based on the plugging mechanism of the in-situ self-growing dispersed colloid system characterized and optimized by CMG reservoir numerical simulation software, it was found that the configured system can form dispersed colloid particles in situ, which has the characteristic of spreading farther. The results are as follows Figure 4 shown.

[0058] Finally, the injection volume and injection rate were optimized with the recovery rate as the target. It was found that the injection rate was 120m 3 / d has the best recovery effect, and the larger the injection volume, the better. Figure 5 and Figure 6 shown.

[0059] It should be noted that the results of the above embodiments only illustrate that the above in-situ self-growing dispersed colloid system is suitable for the conditions of the target oil field. For various water-flooded oil reservoirs, the preparation method and process provided by the present invention can be used to achieve in-situ plugging of the target oil reservoir.

[0060] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A method for preparing an in-situ self-growing dispersed colloid system, characterized in that: The following steps are involved: S1: preferably an emulsifier capable of forming a stable water-in-oil emulsion; S2: preferably a dispersoid system with a steering pressure not lower than a threshold value and a stability time of not less than 6 months under reservoir temperature and salinity conditions, and the dispersoid system includes the emulsifier; S3: Select light crude oil with a viscosity of less than 50 mPa·s; S4: Optimizing the dosage of the emulsifier, dispersoid system and light crude oil according to the target plugging particle size of the target oil reservoir; S5: adding the dispersoid system into water to obtain a dispersed and stable aqueous phase system; S6: Mixing the light crude oil with the water phase system, and stirring in a nitrogen environment to obtain the in-situ self-growing dispersed colloid system.

2. The method for preparing the in-situ self-growing dispersed colloid system according to claim 1, characterized in that: In step S1, the emulsifier includes any one or more of a nonionic emulsifier, an anionic emulsifier, a cationic emulsifier, an amphiphilic surfactant and modified amphiphilic nanoparticles.

3. The method for preparing the in-situ self-growing dispersed colloid system according to claim 2, characterized in that: The nonionic emulsifier is any one or more of Span 80, Span 85, monoglyceride, diglyceride, polyoxyethylene and its derivatives, polyoxypropylene and its derivatives, and lecithin.

4. The method for preparing the in-situ self-growing dispersed colloid system according to claim 2, characterized in that: The anionic emulsifier is any one or more of sodium stearate, sodium laurate and sodium dodecylbenzene sulfonate.

5. The method for preparing the in-situ self-growing dispersed colloid system according to claim 2, characterized in that: The cationic emulsifier is hexadecyltrimethylammonium bromide.

6. The method for preparing the in-situ self-growing dispersed colloid system according to claim 2, characterized in that: The amphiphilic surfactant is any one or more of anionic amphiphilic surfactant, cationic amphiphilic surfactant and nonionic amphiphilic surfactant.

7. The method for preparing the in-situ self-growing dispersed colloid system according to claim 2, characterized in that: The nanoparticles modified by the modified amphiphilic nanoparticles are any one of nano-silicon dioxide, nano-aluminum oxide, nano-iron oxide and carbon nanotubes.

8. The method for preparing the in-situ self-growing dispersed colloid system according to claim 1, characterized in that: In step S2, the dispersoid system further includes a water-soluble functional monomer, a cross-linking agent and an initiator.

9. The method for preparing the in-situ self-growing dispersed colloid system according to claim 8, characterized in that: The water-soluble functional monomer is any one or more of acrylamide, N-vinyl pyrrolidone, 3-methacrylamide dopamine, acrylic acid, vinyl alcohol, methacrylic acid, polyvinyl alcohol and polyvinyl alcohol.

10. The method for preparing the in-situ self-growing dispersed colloid system according to claim 8, characterized in that: The cross-linking agent is any one or more of a multifunctional monomer, an aldehyde cross-linking agent and an isocyanate cross-linking agent.

11. The method for preparing the in-situ self-growing dispersed colloid system according to claim 10, characterized in that: The multifunctional monomer is any one or more of allyl melamine, N,N'-methylenebisacrylamide, tetravinylcyclotetrasiloxane and phenyltrichlorosilane; the aldehyde crosslinking agent is formaldehyde and / or valeraldehyde; and the isocyanate crosslinking agent is vinyl diisocyanate and / or triisocyanate.

12. The method for preparing the in-situ self-growing dispersed colloid system according to claim 8, characterized in that: The initiator is any one or more of a peroxide initiator, an azo compound initiator, a fluoride initiator and a chloride initiator; the peroxide initiator is dibenzoyl peroxide and / or hydrogen peroxide; the azo compound initiator is azobisisobutyronitrile and / or azodifluoropropionic acid; the fluoride initiator is ammonium fluoride; and the chloride initiator is sodium chloroacetate.

13. The method for preparing an in-situ self-growing dispersed colloid system according to any one of claims 1 to 12, characterized in that: The dispersoid system further comprises a deoxidizer and / or a polymerization inhibitor; the deoxidizer is sodium bisulfite; the polymerization inhibitor is any one or more of tert-N-phenylethyl-N-tetradecyl methacrylamide, butylphenol, nitrophenol, p-aminophenol and diethyl phthalate.

14. An in-situ self-growing dispersed colloid system, characterized in that: The in-situ self-growing dispersed colloid system is prepared by the preparation method of any one of claims 1 to 13.

15. The injection process of the in-situ self-growing dispersed adhesive system according to claim 14, characterized in that: The following steps are involved: S1': Statistical analysis of the pore size of the target reservoir is performed to determine the particle size for plugging the pores; S2': Perform historical matching on the oil / water wells that need to be plugged to determine the current water saturation of their high-permeability channels; S3': based on the current water saturation and the particle size of the pores to be plugged, the concentration of each component in the in-situ self-growing dispersoid system is optimized according to the maximum particle size that can be formed by the in-situ self-growing dispersoid system in the reservoir; S4': Test the viscosity and plugging performance of the pre-emulsion of the selected in-situ self-growing dispersed colloid system through indoor experiments, and characterize the plugging mechanism of the selected in-situ self-growing dispersed colloid system based on CMG reservoir numerical simulation software; S5': Optimize the injection volume, injection system concentration and injection speed through CMG reservoir numerical simulation software to form an injection process plan, and inject into the target oil / water well according to the injection process plan.

16. The injection process of the in-situ self-growing dispersed adhesive system according to claim 15, characterized in that: In step S1', mercury injection data or SEM data of reservoir cores are used to calculate the particle size distribution, and the average value of the maximum particle size accounting for 30% is selected as the particle size for plugging pores.

17. The injection process of the in-situ self-growing dispersed adhesive system according to claim 15, characterized in that: In step S3', when optimizing the concentration of each component, the particle size distribution of the in-situ self-growing dispersed colloid system configured by the adopted concentration is between the target particle size and 1 / 3 of the target particle size.

18. The injection process of the in-situ self-growing dispersed adhesive system according to claim 15, characterized in that: In step S4', when testing the viscosity of the pre-emulsion, measurements are taken at different times, and the resistance coefficient is tested through a displacement experiment. The core permeability and porosity used in the displacement experiment meet the target reservoir parameters; the change process of the pre-emulsion viscosity and the change of the in-situ dispersed glue plugging effect are characterized by a multi-component model and a reaction equation to form a fluid model that can characterize the plugging performance of the in-situ self-growing dispersed glue system.

19. The injection process of the in-situ self-growing dispersed adhesive system according to claim 18, characterized in that: The different times refer to 0d, 3d, 5d, 10d, 20d, 30d to emulsification or gelation time.

20. The injection process of the in-situ self-growing dispersed adhesive system according to claim 18, characterized in that: In step S5', the fitted geological model and the fluid model characterizing the plugging performance of the in-situ self-growing dispersed gel system are used to predict the effect of enhancing oil recovery under different process parameters, thereby forming an injection process plan.

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