CN115305071A - Phenolic aldehyde system weak gel profile control and flooding agent, modifier and preparation method thereof - Google Patents

Phenolic aldehyde system weak gel profile control and flooding agent, modifier and preparation method thereof Download PDF

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CN115305071A
CN115305071A CN202110502145.1A CN202110502145A CN115305071A CN 115305071 A CN115305071 A CN 115305071A CN 202110502145 A CN202110502145 A CN 202110502145A CN 115305071 A CN115305071 A CN 115305071A
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acid monoglyceride
phenolic
nitrite
modifier
weak gel
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CN115305071B (en
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时昌新
张明龙
王哲
何萌
陈亚娟
宋御冕
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Petrochina Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
    • C09K8/504—Compositions based on water or polar solvents
    • C09K8/506—Compositions based on water or polar solvents containing organic compounds
    • C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
    • C09K8/512—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
    • C09K8/504—Compositions based on water or polar solvents
    • C09K8/506—Compositions based on water or polar solvents containing organic compounds
    • C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
    • C09K8/5083—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/60—Compositions for stimulating production by acting on the underground formation
    • C09K8/84—Compositions based on water or polar solvents
    • C09K8/86—Compositions based on water or polar solvents containing organic compounds
    • C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
    • C09K8/882—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/60—Compositions for stimulating production by acting on the underground formation
    • C09K8/84—Compositions based on water or polar solvents
    • C09K8/86—Compositions based on water or polar solvents containing organic compounds
    • C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
    • C09K8/887—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents

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Abstract

The application provides a modifier for a phenolic aldehyde system weak gel modifying and flooding agent, which comprises organic acid monoglyceride, nitrite, an antioxidant and water. Wherein the organic acid monoglyceride comprises C1-C4 organic acid monoglyceride; preferably, the C1-C4 organic acid monoglyceride comprises one or more of formic acid monoglyceride, acetic acid monoglyceride, propionic acid monoglyceride and isobutyric acid monoglyceride. The modifier of the phenolic aldehyde system weak gel profile control and flooding agent has good water solubility, can form a uniform and stable solution with a cross-linking agent, can improve the stability of a gluing system, keeps the viscosity of the cross-linking system, and further improves the profile control effect.

Description

Phenolic aldehyde system weak gel profile control and flooding agent, modifier and preparation method thereof
Technical Field
The application relates to the field of petroleum exploration, in particular to a phenolic aldehyde system weak gel profile control and flooding agent, a modifier and a preparation method thereof.
Background
When old oil field development enters a medium-high water-cut period, a plurality of contradictions in the development process gradually appear. In the process of water injection development, due to the heterogeneity of the plane and the longitudinal direction of a reservoir stratum and the difference of oil-water phases in viscosity, injected water can be caused to flow into a production well along a hypertonic layer, a superior water flow potential channel is formed in the hypertonic layer, water coning, water channeling and other phenomena are caused, so that the oil well is exposed to water or flooded early in the initial development stage, and the water content rising speed is obviously accelerated. Meanwhile, invalid circulation of injected water is formed, the water drive efficiency of an oil layer is low, the yield is reduced, the oil extraction speed is reduced, the contradiction is more prominent along with the extension of the development time of the oil field, the stable yield of the oil field is seriously restricted, and therefore the water injection well profile control and drive are very necessary to be carried out.
The modifying and flooding agent adopted in the current indoor research and oil field and mine field test mostly belongs to a weak gel system, and mainly comprises two parts, namely a polymer and a cross-linking agent. Polyacrylamide and xanthan gum are mostly used as the polymer. The cross-linking agent system adopted by the weak gel mainly comprises: phenolic crosslinking systems, cr (III) crosslinking systems, al (III) metal crosslinking systems, and the like. Metal crosslinking systems are mostly used in low temperature formations <70 ℃. The composite cross-linking agent is usually composed of a phenolic aldehyde system and a metal system, and is suitable for medium and low temperature oil reservoirs at 70-90 ℃. A medium-high temperature (> 90 ℃) oil reservoir multi-purpose phenolic aldehyde crosslinking system. The phenolic resin cross-linking agent system is generally composed of formaldehyde, phenol and polyacrylamide, the formaldehyde and the phenol can be cross-linked with acrylamide amino groups of polymers to form gel, the formaldehyde and the phenol in the system react to form phenolic resin, and the phenolic resin with active groups is continuously subjected to polycondensation with amino groups in the polyacrylamide to form the gel. If the deep stratum is to be subjected to profile control and flooding, the purpose of delaying crosslinking is required to be realized, and systems such as acrylamide polymers, urotropin, phenol and the like can be adopted. The basic principle is that the urotropine generates formaldehyde under the condition of an acid medium and/or a high-temperature environment, then the formaldehyde reacts with phenol to generate polyhydroxy phenol, and both the polyhydroxy phenol and the polyhydroxy phenol can generate crosslinking action with polyacrylamide to form gel.
The acidic medium commonly used in phenolic systems is oxalic acid or ammonium chloride (liuyuli, etc.). In addition, in order to improve the stability of the system, the interference of oxygen in water is often required to be removed, so that an oxygen scavenger needs to be added. A common oxygen scavenger is thiourea. At the same time, urea (Korea, etc.) is often added in order to improve the properties of the crosslinker system. Thiourea readily decomposes ammonia due to the presence of amine groups in the molecule, ammonium chloride itself contains ammonia, and urotropine also decomposes to produce ammonia (chenkui et al). The generation of ammonia not only changes the pH of the gel, but also deteriorates the water solubility of the crosslinking agent (rocui et al). Therefore, suitable regulators are sought to achieve the crosslinking gelling properties of phenolic systems.
[ REFERENCE ] to
Liuyuli, a low-cost HPAM phenolic gel system [ J ] applied chemical industry, 2014, 43 (5) 883-886;
indoor experimental study on HPAM phenolic aldehyde/urea formaldehyde composite cross-linked polymer gel temporary plugging agent [ J ], fine petrochemical engineering progress 2014, 15 (5): 17-19];
research on a chenopodium chensinensis, temperature-resistant, salt-resistant and weak gel control system [ D ], northeast petroleum university, 2016; synthesis and modification of low molecular weight water-soluble phenolic resin [ D ], university of harbin science, 2010.
Disclosure of Invention
In order to solve the technical problems, the application provides a modifier for a phenolic system weak gel modifying and flooding agent, which comprises organic acid monoglyceride, nitrite, an antioxidant and water.
According to one embodiment of the present invention, the organic acid monoglyceride includes a C1 to C4 organic acid monoglyceride; according to an embodiment of the invention, the C1-C4 organic acid monoglyceride includes one or more of formic acid monoglyceride, acetic acid monoglyceride, propionic acid monoglyceride, and isobutyric acid monoglyceride.
According to one embodiment of the invention, the nitrite comprises one or more of sodium nitrite, potassium nitrite, or lithium nitrite.
According to one embodiment of the invention, the antioxidant comprises ascorbate, erythorbate, a metal compound, sulphate or sulphite.
According to one embodiment of the invention, the weight ratio of the components comprises 5-20% of C1-C4 organic acid monoglyceride, 5-15% of nitrite, 1-5% of antioxidant and the balance of water.
Another aspect of the present invention is to provide a phenolic system weak gel flooding agent comprising the above-mentioned modifier, the phenolic system weak gel flooding agent comprising the modifier as described above, and a polymer, a phenolic crosslinker, and/or an oxygen scavenger.
According to one embodiment of the invention, the polymer is one or more of guar gum, xanthan gum, galactomannan gum and derivatives thereof, cellulose and cellulose derivatives thereof, polyacrylamide and partially hydrolyzed polyacrylamide.
According to one embodiment of the present invention, the phenolic crosslinker comprises an aldehyde compound, a phenolic compound, or a derivative thereof.
According to an embodiment of the present invention, the aldehyde compound includes formaldehyde, methyl formaldehyde, butyl formaldehyde, acetaldehyde, propionaldehyde, butyraldehyde, crotonaldehyde, valeraldehyde, caproaldehyde, heptaldehyde, benzaldehyde; and compounds which can be decomposed into aldehydes; preferably, the compounds decomposable into aldehydes include paraformaldehyde, trioxane, furfural, hexamethylenetriamine, hexamethylenetetramine, alditol, β -hydroxybutyraldehyde and acetal and mixtures thereof.
According to one embodiment of the invention, the phenolic compound comprises one or more of resorcinol, catechol, hydroquinone, pyrogallol, phloroglucinol, dihydroxy bisphenol, phenol.
The invention also provides a preparation method of the regulator for the weak gel displacement agent of the phenolic aldehyde system, which comprises the steps of mixing water-soluble organic acid monoglyceride, nitrite, antioxidant and water; preferably, the regulator comprises the following components in parts by weight: 5 to 20 weight percent of C1 to C4 organic acid monoglyceride, 5 to 15 weight percent of nitrite, 1 to 5 weight percent of antioxidant and the balance of water.
The inventor finds that: water-soluble monoglyceride is hydrolyzed in water to generate glycerol and organic acid, wherein the organic acid can promote the aldehyde compounds such as urotropine to be decomposed to generate formaldehyde, and the generated organic acid can be combined with calcium and magnesium ions in the water to avoid influencing the viscosity of polyacrylamide. Secondly, the generated organic acid of the water-soluble monoglyceride is used to generate nitrous acid with nitrite, and the nitrous acid reacts with aldehyde compounds such as urotropin and ammonia generated by the decomposition of an oxygen scavenger such as thiourea, so that the ammonia is prevented from being crosslinked with the aldehyde compounds such as formaldehyde, and the gelling performance of the system is prevented from being influenced. In addition, an antioxidant such as sodium ascorbate can be added to react with oxygen to prevent oxidation of sodium nitrite by oxygen, thereby ensuring the stability of the regulator. The present invention has been completed based on this finding.
Compared with the prior art, the invention has at least the following effects: the regulator for the phenolic aldehyde system weak gel profile control agent has good water solubility, can form a uniform and stable solution with a cross-linking agent, can improve the stability of a gluing system, keeps the viscosity of the cross-linking system, and further improves the profile control effect.
Drawings
FIG. 1 is a graph of the effect of a conditioning agent in one embodiment of the present invention on a weak gel system of a phenolic system;
FIG. 2 is a graph of the effect of a conditioning agent in another embodiment of the present invention on a weak gel system of a phenolic system;
FIG. 3 is a graph showing the effect of oxalic acid as a modifier on a weak gel system of a phenolic system under the same conditions.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
Applicants have created compositions and related methods for controlling the crosslinking of crosslinkable phenolic systems in well treatment fluids using water soluble organic acid monoglycerides, nitrites, modifiers for antioxidants, and crosslinking agents, and have applied such compositions and methods to many oil and gas recovery operations.
Generally, a polymer is a natural or synthetic substance composed of a large number of macromolecules having a high molecular weight, which are synthesized from a large number of simple molecules (monomers). In the present invention, the polymers include typical crosslinkable organic polymers, sometimes referred to herein equivalently as "gels" or "weak gels," which may be included in the profile control agents and systems described herein, particularly aqueous fluids and systems, and are generally useful with the present invention.
The polymers of the present invention comprise biopolymers, synthetic polymers, or combinations thereof, wherein the crosslinkable organic polymer of "weak gel" or "weak gel in phenolic systems" comprises at least slightly soluble in water (where slightly soluble means a solubility of at least about 0.01kg/m 3 ). Without limitation, these crosslinkable organic polymers can be used to increase the viscosity of the system during application. Various polymers may be used in conjunction with the process of the present inventionThe method and composition are used in combination, and the polymer may be a biopolymer comprising natural, modified and derivatized polysaccharides and derivatives thereof, which comprise one or more monosaccharide units selected from the group consisting of galactose, mannose, glucoside, glucose, xylose, arabinose, fructose, glucuronic acid. Suitable polymers that may be used in accordance with the present disclosure include, but are not limited to, guar gum, hydroxypropyl guar (HPG), cellulose, carboxymethyl cellulose (CMC), carboxymethyl hydroxyethyl cellulose (CMHEC), hydroxyethyl cellulose (HEC), guar gum, xanthan gum, other derivatives of galactomannan gums; for example, various celluloses such as carboxyethyl cellulose, hydroxypropyl cellulose, methylhydroxypropyl cellulose; alkyl celluloses such as methyl cellulose, ethyl cellulose, and propyl cellulose; alkylcarboxyalkylcelluloses, such as ethylcarboxymethylcellulose; alkyl alkylcelluloses, such as methylethylcellulose; hydroxyalkyl celluloses, such as hydroxypropyl methylcellulose; and combinations thereof, and the like. Preferably, according to one non-limiting embodiment of the present disclosure, the polymer is guar gum, hydroxypropyl guar (HPG), or hydroxymethyl cellulose, partially hydrolyzed hydroxymethyl fiber, alone or in combination.
The resin composition in one embodiment of the present invention includes all resins known in the art that are capable of forming a hardened, consolidated mass. Many such resins are commonly used in profile control operations, two of which are contemplated in one practice of the present invention, include two-part epoxy-based resins, novolac resins, polyepoxide resins, phenolic resins, urea-formaldehyde resins, urethane resins, furan/furfuryl alcohol resins, phenolic/latex resins, phenol-formaldehyde resins, polyester resins and mixtures and copolymers thereof, polyurethane resins and mixtures and copolymers thereof, acrylate resins, and mixtures thereof.
In the present invention, the regulator preferably uses water-soluble glycerides; preferably, in one embodiment of the present invention, the water-soluble glycerides comprise organic acid monoglycerides; in one embodiment of the present invention, the organic acid glyceride includes an organic acid monoglyceride dissolved in water; preferably the water-soluble organic acid monoglyceride comprises a C1-C4 organic acid monoglyceride; more preferably comprises one or more of formic acid monoglyceride, acetic acid monoglyceride, propionic acid monoglyceride, isobutyric acid monoglyceride and butyric acid monoglyceride.
In the invention, the water-soluble glyceride or the water-soluble organic acid monoglyceride is hydrolyzed in water to generate glycerol and organic acid, wherein the organic acid plays a role in promoting the aldehyde compounds such as the decomposition of urotropin to generate formaldehyde, and the generated organic acid can be combined with calcium and magnesium ions in the water to avoid influencing the viscosity of polyacrylamide.
In the invention, the regulator preferably uses nitrite, the nitrite can generate nitrous acid with organic acid generated by water-soluble monoglyceride, and the nitrous acid can react with aldehyde compounds such as urotropin and/or ammonia generated by decomposition of an oxygen scavenger such as thiourea, so as to avoid the ammonia and the aldehyde compounds such as formaldehyde from generating cross-linking and influencing the gelling performance of the system. In one embodiment of the present invention, the water-soluble organic acid monoglyceride includes one embodiment of the present invention, and the nitrite includes one or more of sodium nitrite, potassium nitrite, or lithium nitrite. Preferably, in one embodiment of the present invention, the nitrite comprises sodium nitrite, potassium nitrite.
In the present invention, the conditioning agent is preferably added with an antioxidant, and in one embodiment of the present invention, the antioxidant comprises ascorbate, erythorbate, metal compound, sulfate or sulfite. The antioxidant added in the invention, such as sodium ascorbate, can react with oxygen, so as to avoid oxidation of sodium nitrite by oxygen and ensure the stability of the regulator. In one embodiment of the present invention, there is provided the above modifier for weak gel profile control agent of phenolic system, which comprises water-soluble organic acid monoglyceride, nitrite, antioxidant, and water.
Preferably, in one embodiment of the invention, the modifier for the phenolic aldehyde system weak gel modifier-flooding agent comprises 5-20 wt% of C1-C4 organic acid monoglyceride, 5-15 wt% of nitrite, 1-5 wt% of antioxidant and the balance of water.
In one embodiment of the present invention, the aldehyde compounds in the phenolic aldehyde system include formaldehyde, methyl formaldehyde, butyl formaldehyde, acetaldehyde, propionaldehyde, butyraldehyde, crotonaldehyde, valeraldehyde, caproaldehyde, heptaldehyde, benzaldehyde; and compounds which can be decomposed into aldehydes; preferably, the compounds decomposable into aldehydes include paraformaldehyde, trioxane, furfural, hexamethylenetriamine, hexamethylenetetramine, alditol, β -hydroxybutyraldehyde and acetal and mixtures thereof.
In one embodiment of the present invention, the phenolic compound in the phenolic aldehyde system comprises one or more of resorcinol, catechol, hydroquinone, pyrogallol, phloroglucinol, dihydroxy bisphenol and phenol.
In one embodiment of the invention, the phenolic system weak gel profile control agent comprises the profile control agent, a polymer, a phenolic crosslinking agent and/or an oxygen scavenger.
Other objects, features and advantages of the present invention will become apparent from the following detailed description. It should be understood, however, that the detailed description and the examples, while indicating specific embodiments of the invention, are given by way of illustration only. In addition, it is contemplated that changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
Description of illustrative embodiments
[ example 1 ]
Based on 100 g of the total amount, wherein 10% by weight of the monoglyceride formate, 10% by weight of the sodium nitrite, 2% by weight of the sodium erythorbate and the balance of water are added into water, then the monoglyceride formate is added, and the mixture is stirred for one hour to obtain the cross-linking agent regulator.
[ example 2 ]
Based on 100 g of the total amount, wherein 10% by weight of the monoglyceride formate, 5% by weight of the sodium nitrite, 3% by weight of the sodium erythorbate and the balance of water are added into the water, then the monoglyceride formate is added into the water, and the mixture is stirred for one hour to obtain the cross-linking agent regulator.
[ Experimental example 1 ]
For the method of using the regulators prepared in examples 1 and 2 above, the following description is made:
water for experiment: the west willow 10 broken water source well water of the North China oil field oil extraction plant. The degree of mineralization is 522mg/L.
The polymer has a polyacrylamide molecular weight of 1900 ten thousand, and is made by Beijing Hexagon chemical group, LLC (product number 62523). The concentration used was 1200mg/L.
The cross-linking agent is phenol: the two components of urotropine are prepared according to 800mg/L and 8000 mg/L. Purchased from Tiancheng company in North China oil field.
The modulators prepared in examples 1 and 2 provided by the present invention were added to the solution at a concentration of 800mg/L.
For comparison, ammonium chloride was added as a regulator, at a concentration of 800mg/L (see FIG. 1, as in FIG. 2).
For comparison, oxalic acid was added as a modifier and used at a concentration of 800mg/L (see FIG. 3 for the profile control agent corresponding to the dashed line).
And (3) placing the prepared modifying and flooding agent solution into a 120 ℃ oven, and inspecting the gelling performance. Viscosity measurements were performed using a HAAKE MARS rheometer. The experimental results are shown in fig. 1, fig. 2 and fig. 3.
As shown in fig. 1 and fig. 2, the regulators prepared in example 1 (corresponding to fig. 1) and example 2 (corresponding to fig. 2) were added respectively, and the stability of the formed cross-linking agent was greatly improved compared with the existing regulator (ammonium chloride), and the time of maximum viscosity appeared later, which is beneficial to the profile control and profile control of deep formations.
As shown in FIG. 3, the regulator of the present invention has a higher viscosity-maintaining effect for 25 days or even 30 days under the same use conditions as oxalic acid (used at a concentration of 800 mg/L).
All reagents or instruments of the present invention are conventional reagents or commercially available. The previous description is only an example of the present application, and is provided to enable any person skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A modifier for weak gel modifying and flooding agent of phenolic aldehyde system is prepared from organic acid monoglyceride, nitrite, antioxidant and water.
2. The conditioner of claim 1, wherein said organic acid monoglyceride comprises a C1-C4 organic acid monoglyceride; preferably comprises one or more of formic acid monoglyceride, acetic acid monoglyceride, propionic acid monoglyceride and isobutyric acid monoglyceride.
3. The modulator according to claim 1, wherein the nitrite comprises one or more of sodium nitrite, potassium nitrite, or lithium nitrite.
4. The modulator of claim 1, wherein said antioxidant comprises ascorbate, erythorbate, a metal compound, sulfate, or sulfite.
5. The regulator according to any one of claims 1 to 4, wherein the weight ratio of the components comprises 5 to 20 weight percent of C1-C4 organic acid monoglyceride, 5 to 15 weight percent of nitrite, 1 to 5 weight percent of antioxidant, and the balance of water.
6. A phenolic system weak gel profile control agent, characterized in that the phenolic system weak gel profile control agent comprises the profile control agent of any one of claims 1 to 5, and a polymer, a phenolic crosslinking agent, and/or an oxygen scavenger.
7. The phenolic system weak gel profile control agent of claim 6, wherein the polymer is one or more of guar gum, xanthan gum, galactomannan gum and derivatives thereof, cellulose and cellulose derivatives thereof, polyacrylamide and partially hydrolyzed polyacrylamide.
8. The phenolic system weak gel flooding modifier of claim 6, wherein the phenolic aldehyde crosslinking agent comprises an aldehyde compound, a phenolic compound or a derivative thereof.
9. The phenolic system weak gel profile control agent of claim 6, wherein the aldehyde compound comprises formaldehyde, methyl formaldehyde, butyl formaldehyde, acetaldehyde, propionaldehyde, butyraldehyde, crotonaldehyde, valeraldehyde, caproaldehyde, heptaldehyde, benzaldehyde; and compounds decomposable to aldehydes; preferably, the compounds decomposable to aldehydes include paraformaldehyde, trioxane, furfural, hexamethylenetriamine, hexamethylenetetramine, alditol, beta-hydroxybutyraldehyde and acetal, and mixtures thereof; and/or the phenolic compound comprises one or more of resorcinol, catechol, hydroquinone, pyrogallol, phloroglucinol, dihydroxy bisphenol and phenol.
10. A preparation method of a modifier for a phenolic aldehyde system weak gel modifier-flooding agent is characterized in that the modifier is prepared by mixing water-soluble organic acid monoglyceride, nitrite, an antioxidant and water.
CN202110502145.1A 2021-05-08 Phenolic aldehyde system weak gel profile control agent, modifier and preparation method thereof Active CN115305071B (en)

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