CN111087990B - High-temperature-resistant gel plugging agent composition and preparation method and application thereof - Google Patents
High-temperature-resistant gel plugging agent composition and preparation method and application thereof Download PDFInfo
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- CN111087990B CN111087990B CN201811237048.9A CN201811237048A CN111087990B CN 111087990 B CN111087990 B CN 111087990B CN 201811237048 A CN201811237048 A CN 201811237048A CN 111087990 B CN111087990 B CN 111087990B
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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
- C09K8/5086—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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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
- C09K8/5083—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
- E21B33/138—Plastering the borehole wall; Injecting into the formation
Abstract
The invention relates to the technical field of oil exploitation, and provides a high-temperature-resistant gel plugging agent composition, and a preparation method and application thereof. The high-temperature resistant gel blocking agent composition comprises: acrylamide polymer, water-soluble melamine formaldehyde resin, organic chromium, oxygen scavenger, urea compound and water, wherein the urea compound has a structure shown in formula (1) and/or formula (2), R1And R2Each independently selected from hydrogen or 2-propynyl; r3、R4And R5Each independently selected from oxygen, sulfur or imino. The high-temperature resistant gel plugging agent composition provided by the invention is simple in preparation method, can effectively plug a steam channeling channel for a long time (30-90 days) at a higher temperature (150-.
Description
Technical Field
The invention relates to the technical field of oil exploitation, in particular to a high-temperature-resistant gel plugging agent composition and a preparation method and application thereof.
Background
Steam stimulation is the main mode of heavy oil development, is considered to be a conventional, economical and effective method and is widely used by heavy oil fields. Along with the progress of the multiple times of huff and puff stages, the water invasion and steam channeling are serious, the water content of the oil well is greatly increased, different degrees of influence are brought to the thermal recovery of the heavy oil reservoir, and the thermal recovery effect is deteriorated. The high water content of an oil well in the thermal recovery process of a heavy oil reservoir becomes a main problem influencing the thermal recovery effect. At present, one of the most effective methods for solving the problem is to use a gel plugging agent to block a steam channeling channel and improve the utilization degree and recovery ratio of thick oil.
The existing gel plugging agent is compounded and injected into a stratum by taking a polyacrylamide aqueous solution as a thickening agent and phenolic resin as a crosslinking agent, and is crosslinked in situ at the deep part of the stratum to form gel for plugging water. However, the technology is only suitable for the environment below 120 ℃, and cannot stably block water for a long time in a high-temperature steam huff and puff environment, because the system is unstable at high temperature, the working fluid enters the stratum and is excessively crosslinked in the early stage to be dehydrated, and the working fluid is thermally degraded in the later stage. Therefore, for the water shutoff operation of the steam huff and puff of the heavy oil reservoir, the construction success rate is not high, the oil increasing effective period is short, and the oil increasing effect is limited. The gel plugging agent which is effective for a long time at a higher temperature and in a longer time range is a current technical difficulty and needs to be broken through urgently.
Disclosure of Invention
Aiming at the problem that the existing gel plugging agent can not be effectively applied to higher temperature and realize longer-time water plugging, the invention aims to provide a novel high-temperature-resistant gel plugging agent composition, and a preparation method and application thereof. The high-temperature-resistant gel plugging agent composition can effectively plug a steam channeling channel in a higher temperature environment and in a longer time range, and realizes the high-efficiency development of a heavy oil reservoir.
According to a first aspect of the present invention, there is provided a high temperature resistant gel blocking composition comprising: acrylamide polymer, water-soluble melamine formaldehyde resin, organic chromium, oxygen scavenger, urea compound and water, wherein the urea compound has a structure shown in formula (1) and/or formula (2),
wherein R is1And R2Each independently selected from hydrogen or 2-propynyl; r3And R4Each independently oxygen, sulfur or imino;
the content of the urea compound is 0.1-2 wt% based on the total weight of the high-temperature resistant gel blocking agent composition.
According to a second aspect of the present invention, there is provided a method for preparing the high temperature resistant gel blocking agent composition, the method comprising:
(1) dissolving acrylamide polymer in water to obtain polymer water solution;
(2) and adding water-soluble melamine formaldehyde resin, organic chromium, urea compounds and a deoxidant into the polymer aqueous solution, and stirring until the mixture is dissolved to obtain the high-temperature-resistant gel plugging agent composition.
According to a third aspect of the invention, the invention provides the use of the high temperature resistant gel plug composition in heavy oil steam stimulation thermal recovery.
The high-temperature resistant gel plugging agent composition provided by the invention is simple in preparation method, can effectively plug a steam channeling channel for a long time (30-90 days) at a higher temperature (150-. Compared with the existing gel plugging agent, the gel plugging agent has higher plugging rate and longer plugging time, and can be suitable for large pore path plugging operation in heavy oil steam huff and puff thermal recovery operation.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
According to a first aspect of the present invention, there is provided a high temperature resistant gel blocking composition comprising: acrylamide polymer, water-soluble melamine formaldehyde resin, organic chromium, oxygen scavenger, urea compound and water.
In the present invention, the urea compound has a structure represented by formula (1) and/or formula (2),
wherein R is1And R2Each independently selected from hydrogen or 2-propynyl, R3And R4Each independently oxygen, sulfur or imino.
Preferably, the urea compound is one or more of urea, 2-propynyl urea, biuret, thiobiuret and 2-imino-4-thiobiuret.
More preferably, the urea-based compound is urea. Urea has a smaller molecular weight and volume compared to its dimer (e.g. biuret) and its substituted compounds (e.g. 2-propynyl urea), has less steric hindrance and better mobility when reacted in the gel blocking agent system, and is able to compete better to some extent with polyacrylamide-based polymers during the condensation reaction with water-soluble melamine formaldehyde resins.
In the present invention, the content of the urea compound is 0.1 to 2 wt%, preferably 0.2 to 1 wt%, based on the total weight of the high temperature resistant gel blocking agent composition.
In the present invention, the kind and amount of the acrylamide-based polymer may be selected with reference to the prior art, and the acrylamide-based polymer may be synthesized according to the prior art or commercially available. For the present invention, preferably, the acrylamide-based polymer is one or more of partially hydrolyzed polyacrylamide, partially hydrolyzed methylene polyacrylamide, acrylamide/acrylic acid/AMPS sodium salt copolymer, acrylamide/acrylic acid/acrylonitrile sodium salt copolymer, and acrylamide/sodium acrylate/cationic monomer copolymer. Wherein the partially hydrolyzed polyacrylamide and the acrylamide/acrylic acid/AMPS sodium salt copolymer are available from Shandong Baumo et al.
Preferably, the viscosity average molecular weight of the acrylamide polymer is 800 to 3500 ten thousand, more preferably 1000 to 3000 ten thousand; the degree of hydrolysis of the acrylamide-based polymer is 8 to 35%, more preferably 10 to 25%.
In the present invention, the degree of hydrolysis is measured by the method for measuring the degree of hydrolysis of partially hydrolyzed polyacrylamide according to the national standard GB/T12005.6-1989.
Preferably, the acrylamide polymer is contained in an amount of 0.1 to 2% by weight, more preferably 0.2 to 1% by weight, based on the total weight of the high temperature resistant gel blocking composition.
In the present invention, the water-soluble melamine-formaldehyde resin is preferably obtained by polymerizing melamine/formaldehyde monomers in a molar ratio of 0.08 to 0.5 at a high temperature of pH 8 to 9. Typically, the water-soluble melamine formaldehyde resin is a colorless transparent liquid.
Preferably, the water-soluble melamine formaldehyde resin is present in an amount of from 0.1 to 2% by weight, more preferably from 0.2 to 1.4% by weight, based on the total weight of the high temperature resistant gel blocking composition.
In the present invention, the organic chromium is preferably one or more of chromium acetate, chromium oxalate, chromium lactate, chromium propionate, chromium malonate, and chromium citrate, and more preferably chromium lactate. The organic acid chromium can be prepared according to the prior art, and according to an embodiment of the invention, chromium (II) is firstly reacted with sodium nitrite, reduced to chromium (III) and then complexed with an organic acid (preferably one or more of acetic acid, oxalic acid, lactic acid, propionic acid, malonic acid and citric acid), wherein the molar ratio of the reaction of chromium (II) and sodium nitrite is 1/4-1/3, the molar ratio of the complexation of the reaction of chromium (III) and the organic acid is 1/50-1/10, the obtained organic chromium is dark green solution, the pH value is 4-10, and the effective content of chromium (III) is more than 2%.
Preferably, the organic chromium is present in an amount of 0.01 to 2 wt%, more preferably 0.03 to 1.5 wt%, based on the total weight of the high temperature resistant gel plug composition.
In the invention, the oxygen scavenger can reduce the oxidative degradation of the polymer in the system, and the type and the dosage of the oxygen scavenger can be selected according to the prior art. In the present invention, preferably, the oxygen scavenger is one or more of sodium thiosulfate, sodium sulfite, sodium bisulfite, sodium hydrosulfite and erythorbic acid.
Preferably, the oxygen scavenger is present in an amount of 0.05 to 1 wt%, based on the total weight of the high temperature resistant gel plug composition.
In the present invention, water is used as the solvent and the reaction medium in the high temperature resistant gel blocking agent composition system, and the selection of the solvent and the reaction medium is not particularly limited by the present invention. The degree of mineralization of water is usually less than 500 mg, and can be natural water, such as rivers, lakes, atmospheric water, seawater, groundwater and the like, and artificial water, such as tap water, distilled water, deionized water or heavy water. In the present invention, the water is contained in an amount of 91 to 99.64 wt%, preferably 94.1 to 99.32 wt%, based on the total weight of the high temperature resistant gel blocking composition.
In the invention, the content of each component in the high-temperature resistant gel plugging agent composition is calculated by the feeding amount.
The high-temperature-resistant gel plugging agent composition is particularly suitable for plugging a steam channeling pipeline in the process of steam huff and puff thermal thickened oil recovery. Specifically, hydroxyl groups in the water-soluble melamine formaldehyde resin and amide groups of the acrylamide polymer can undergo an in-situ dehydration condensation reaction at high temperature, so that the acrylamide polymer is crosslinked; meanwhile, the organic chromium in the system and the carboxyl of the acrylamide polymer are subjected to coordination reaction, so that the acrylamide polymer is crosslinked, the system gradually forms gel along with the reaction, and a steam channeling pipeline is blocked in the process of steam huff and puff thermal recovery of the thick oil. In addition to the above reaction, the urea compound contained in the system can also undergo a dehydration condensation reaction with the water-soluble melamine formaldehyde resin, and the possible reaction mechanism is as follows (taking the urea compound represented by formula (1) as an example):
therefore, the urea compound competes with the condensation reaction of the acrylamide polymer and the water-soluble melamine formaldehyde resin, so that the crosslinking speed of the acrylamide polymer is reduced, and the crosslinking reaction of the acrylamide polymer can be continuously carried out for a long time.
In addition, the addition of the urea compound reduces the density of crosslinking active points in the system, inhibits the dehydration phenomenon caused by excessive crosslinking of the acrylamide polymer, can adjust the distance between the crosslinking active points, slows down the degree of coverage of the crosslinking active points, improves the crosslinking efficiency, increases the strength of gel formed by the crosslinking system, and enables the formed gel system to be stable at a higher temperature. According to the determination, the gel plugging agent composition can be gelled in one day at the high temperature of 150 ℃ to form plugging.
According to the invention, the gel plugging agent composition contains an s-triazine ring structure, and the introduction of the aromatic heterocyclic structure greatly enhances the conjugation effect in a crosslinking system, so that the C-N bond in the system is firmer, and the high temperature resistance of the formed gel is improved.
According to a second aspect of the present invention, there is provided a method of preparing a high temperature resistant gelling plugging agent composition according to the first aspect of the present invention, the method comprising:
(1) dissolving acrylamide polymer in water to obtain polymer water solution;
(2) and adding water-soluble melamine formaldehyde resin, organic chromium, urea compounds and a deoxidant into the polymer aqueous solution, and stirring until the mixture is completely dissolved to obtain the high-temperature-resistant gel plugging agent composition.
According to a third aspect of the invention, the invention provides the use of the high temperature resistant gel plug composition in heavy oil steam stimulation thermal recovery. As mentioned above, the high temperature resistant gel plugging agent composition of the invention is particularly suitable for plugging a steam channeling pipeline in the process of steam stimulation thermal thickened oil recovery.
According to the invention, the application may comprise: injecting the high-temperature-resistant gel plugging agent composition into the stratum, so that the high-temperature-resistant gel plugging agent composition is crosslinked in situ in the stratum to form gel.
Under the environment of steam stimulation thermal recovery of thickened oil, the gel plugging agent formed by the high-temperature-resistant gel plugging agent composition can be kept for 30-90 days at the temperature of 150-180 ℃.
The present invention will be described in detail below by way of examples.
Example 1
This example illustrates the high temperature resistant gel blocking composition and method of making the same according to the present invention.
At room temperature, 20 g of partially hydrolyzed polyacrylamide (viscosity average molecular weight 800 ten thousand, degree of hydrolysis 8%) is dissolved in 1L of water, and the mixture is stirred at 500 rpm until the partially hydrolyzed polyacrylamide is completely dissolved; and then sequentially adding 20 g of water-soluble melamine-formaldehyde resin (the molar ratio of melamine to formaldehyde is 0.3), 20 g of chromium acetate, 10 g of urea and 10 g of sodium thiosulfate, and stirring until the mixture is completely dissolved to obtain the high-temperature resistant gel plugging agent composition.
The blocking performance of the high temperature resistant gel blocking agent composition was tested at a temperature of 150 ℃ for 60 days of standing time, and the results are shown in table 1.
The Darcy principle is applied to the test of the plugging performance, and the prior art can be specifically referred to. The method for testing the plugging performance comprises the following steps:
filling a simulation core (the diameter d of the core is 25mm, the length L of the core is 200mm), injecting water into the core at the flow rate of 2 ml/min (injection rate Q) after vacuumizing, and measuring the permeability (k) before core plugging0) (ii) a Then injecting 1.0-1.5PV of the high-temperature-resistant gel plugging agent composition into the core model, plugging two ends of the core by using a screw plug, putting the core into a thermostat at 150 DEG CStanding for 60 days, injecting water again until the pressure is stable, recording the reading on a pressure gauge to obtain the injection pressure difference, and calculating the permeability (k') after the core is blocked so as to calculate the blocking rate.
For convenience of description and explanation, k will be given0And k' are collectively called as core permeability k, and the calculation formula is as follows:
wherein Q is the injection rate, mL · s-1(ii) a μ is the fluid viscosity, mPa · s; a is the cross section area of the sand-filled model in cm2，A＝πd2(ii)/4; Δ P is the injection pressure difference, 10-1MPa；k，μm2。
In addition, the plugging rate (eta) is taken as a parameter for representing the plugging performance of the plugging agent, and the calculation formula is as follows:
example 2
This example illustrates the high temperature resistant gel blocking composition and method of making the same according to the present invention.
At room temperature, 4 g of acrylamide/acrylic acid/AMPS sodium salt copolymer (viscosity average molecular weight is 2500 ten thousand, hydrolysis degree is 20%) is dissolved in 1L of water, and stirring is carried out at a speed of 500 revolutions per minute until the acrylamide/acrylic acid/AMPS sodium salt copolymer is completely dissolved; 8 g of water-soluble melamine-formaldehyde resin (the molar ratio of melamine to formaldehyde is 0.3), 2 g of chromium lactate, 3 g of urea and 4 g of sodium hydrosulfite are added in sequence and stirred until all the components are dissolved, so as to obtain the high-temperature resistant gel plugging agent composition of the embodiment.
The high temperature resistant gel plugging agent composition is tested for plugging rate under the conditions of 150 ℃/60 days, 150 ℃/75 days, 150 ℃/90 days, 165 ℃/60 days and 180 ℃/60 days, the testing method is the same as that of example 1, and the testing results are shown in tables 1 and 2.
Example 3
This example illustrates the high temperature resistant gel blocking composition and method of making the same according to the present invention.
At room temperature, 1 g of acrylamide/acrylic acid/AMPS sodium salt copolymer (viscosity average molecular weight is 3500 ten thousand, hydrolysis degree is 35%) is dissolved in 1L of water, and the mixture is stirred at 500 revolutions per minute until the acrylamide/acrylic acid/AMPS sodium salt copolymer is completely dissolved; then, 1 g of water-soluble melamine formaldehyde resin (the molar ratio of melamine to formaldehyde is 0.3), 0.1 g of chromium oxalate, 1.5 g of urea and 0.5 g of sodium bisulfite are added in sequence and stirred until the mixture is completely dissolved, so as to obtain the high-temperature resistant gel plugging agent composition.
The blocking rate of the high temperature resistant gel blocking agent composition at the temperature of 150 ℃ for 60 days of standing time was tested in the same manner as in example 1, and the test results are shown in table 1.
Example 4
This example illustrates the high temperature resistant gel blocking composition and method of making the same according to the present invention.
At room temperature, 4 g of acrylamide/acrylic acid/AMPS sodium salt copolymer (viscosity average molecular weight is 2500 ten thousand, hydrolysis degree is 20%) is dissolved in 1L of water, and stirring is carried out at a speed of 500 revolutions per minute until the acrylamide/acrylic acid/AMPS sodium salt copolymer is completely dissolved; 8 g of water-soluble melamine-formaldehyde resin (molar ratio of melamine to formaldehyde is 0.3), 2 g of chromium lactate, 5 g of biuret and 4 g of sodium hydrosulfite are added in sequence and stirred until all the components are dissolved, thus obtaining the high-temperature resistant gel plugging agent composition of the embodiment.
The blocking rate of the high temperature resistant gel blocking agent composition at the temperature of 150 ℃ for 60 days of standing time was tested in the same manner as in example 1, and the test results are shown in table 1.
Example 5
This example illustrates the high temperature resistant gel blocking composition and method of making the same according to the present invention.
At room temperature, 20 parts of hydrolyzed polyacrylamide (viscosity average molecular weight is 800 ten thousand, degree of hydrolysis is 8%) is dissolved in 1L of water, and the mixture is stirred at 500 r/min until the parts of hydrolyzed polyacrylamide are completely dissolved; and then sequentially adding 20 g of water-soluble melamine-formaldehyde resin (the molar ratio of melamine to formaldehyde is 0.3), 20 g of chromium acetate, 20 g of urea and 10 g of sodium thiosulfate, and stirring until the mixture is completely dissolved to obtain the high-temperature resistant gel plugging agent composition.
The blocking rate of the high temperature resistant gel blocking agent composition at the temperature of 150 ℃ for 60 days of standing time was tested in the same manner as in example 1, and the test results are shown in table 1.
Comparative example 1
At room temperature, 4 g of acrylamide/acrylic acid/AMPS sodium salt copolymer (viscosity average molecular weight is 2500 ten thousand, hydrolysis degree is 20%) is dissolved in 1L of water, and stirring is carried out at a speed of 500 revolutions per minute until the acrylamide/acrylic acid/AMPS sodium salt copolymer is completely dissolved; and sequentially adding 8 g of water-soluble melamine-formaldehyde resin (the molar ratio of melamine to formaldehyde is 0.3), 2 g of chromium lactate and 4 g of sodium hydrosulfite, and stirring until the mixture is completely dissolved to obtain the high-temperature-resistant gel plugging agent composition of the comparative example.
The blocking rate of the high temperature resistant gel blocking agent composition at the temperature of 150 ℃ for 60 days of standing time was tested in the same manner as in example 1, and the test results are shown in table 1.
And (3) a plugging rate test result:
TABLE 1
Note: table 1 shows the results of the test of the plugging rate (150 ℃ C./60 days) of examples and comparative examples.
TABLE 2
Note: table 2 shows the results of the plugging rate tests of example 2 under different test conditions.
As can be seen from Table 1, the high temperature resistant gel blocking agent compositions of examples 1 to 5 had higher blocking rates than the gel blocking agent composition containing no urea compound in comparison with the gel blocking agent composition containing no urea compound in comparative example 1, under the condition of standing at 150 ℃ for 60 days. As can be seen from Table 2, the high temperature resistant gel plugging agent composition of the present invention can stably exist for at least 90 days at 150 ℃, and maintain a high plugging rate; can be stably stored for at least 60 days when the temperature is increased to 180 ℃. Therefore, the high-temperature-resistant gel plugging agent composition is applied to heavy oil steam huff-puff thermal recovery, can effectively plug a steam channeling channel at a high temperature (150-.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (10)
1. A high temperature resistant gel blocking composition, wherein said high temperature resistant gel blocking composition comprises: the composite material comprises an acrylamide polymer, water-soluble melamine formaldehyde resin, organic chromium, a deoxidant, a urea compound and water, wherein the urea compound is urea and/or biuret;
wherein, the water-soluble melamine-formaldehyde resin is prepared by mixing melamine and formaldehyde according to the weight ratio of 0.08-0.5: 1 is polymerized;
the high-temperature-resistant gel plugging agent composition comprises, by weight, 0.1-2% of urea compounds, 0.1-2% of acrylamide polymers, 0.1-2% of water-soluble melamine formaldehyde resins, 0.01-2% of organic chromium and 0.05-1% of oxygen scavengers.
2. The high temperature resistant gel blocking composition of claim 1, wherein the urea based compound is present in an amount of 0.2 to 1 wt%, based on the total weight of the high temperature resistant gel blocking composition.
3. The high temperature resistant gelling plugging agent composition of claim 1, wherein said acrylamide-based polymer is one or more of partially hydrolyzed polyacrylamide, partially hydrolyzed methylene polyacrylamide, acrylamide/acrylic acid/AMPS sodium salt copolymer, acrylamide/acrylic acid/acrylonitrile sodium salt copolymer, and acrylamide/sodium acrylate/cationic monomer copolymer.
4. The high temperature resistant gelling plugging agent composition of claim 1 or 3, wherein said acrylamide-based polymer has a viscosity average molecular weight of 800-3500 ten thousand; the hydrolysis degree of the acrylamide polymer is 8-35%.
5. The high temperature resistant gel plug composition of claim 1 wherein the oxygen scavenger is one or more of sodium thiosulfate, sodium sulfite, sodium bisulfite, sodium hydrosulfite, and erythorbic acid.
6. The high temperature resistant gelling plugging agent composition of claim 1, wherein said organic chromium is one or more of chromium acetate, chromium oxalate, chromium lactate, chromium propionate, chromium malonate, and chromium citrate.
7. The high temperature resistant gel plug composition of claim 6 wherein the organic chromium is chromium lactate.
8. A method of making the high temperature resistant gel blocking composition of any one of claims 1 to 7, comprising:
(1) dissolving the acrylamide polymer in water to obtain a polymer aqueous solution;
(2) and adding water-soluble melamine formaldehyde resin, organic chromium, urea compounds and a deoxidant into the polymer aqueous solution, and stirring until the mixture is dissolved to obtain the high-temperature-resistant gel plugging agent composition.
9. Use of the high temperature resistant gel plug composition of any one of claims 1 to 7 in heavy oil steam stimulation thermal recovery.
10. The application of claim 9, wherein the application comprises: injecting the high-temperature-resistant gel plugging agent composition into the stratum, so that the high-temperature-resistant gel plugging agent composition is crosslinked in situ in the stratum to form gel.
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