CN111087987B - High-temperature-resistant cationic copolymer gel plugging agent and preparation method and application thereof - Google Patents
High-temperature-resistant cationic copolymer gel plugging agent and preparation method and application thereof Download PDFInfo
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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
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
- C09K8/493—Additives for reducing or preventing gas migration
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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
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/426—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells for plugging
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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
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/44—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing organic binders only
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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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- 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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- 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 cationic copolymer gel plugging agent, and a preparation method and application thereof. The high-temperature resistant cationic copolymer gel blocking agent comprises: acrylamide/sodium acrylate/cationic monomer copolymer, water-soluble phenolic resin, organic chromium, an oxygen scavenger, a 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 cationic copolymer gel plugging agent 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 high temperature (150-.
Description
Technical Field
The invention relates to the technical field of oil exploitation, in particular to a high-temperature-resistant cationic copolymer gel plugging agent 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 cationic copolymer gel plugging agent, and a preparation method and application thereof. The high-temperature-resistant cationic copolymer gel plugging agent 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 cationic copolymer-based gelling agent comprising: acrylamide/sodium acrylate/cationic monomer copolymer, water-soluble phenolic resin, organic chromium, an oxygen scavenger, a urea compound and water, wherein the urea compound has a structure shown in a formula (1) and/or a 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 cationic copolymer gel blocking agent.
According to a second aspect of the present invention, there is provided a method for preparing the high temperature resistant cationic copolymer-based gel blocking agent, the method comprising:
(1) dissolving acrylamide/sodium acrylate/cationic monomer copolymer in water to obtain polymer aqueous solution;
(2) and adding water-soluble phenolic resin, organic chromium, a urea compound and an oxygen scavenger into the polymer aqueous solution, and stirring until the mixture is dissolved to obtain the high-temperature-resistant cationic copolymer gel plugging agent.
According to a third aspect of the invention, the invention provides application of the high-temperature-resistant cationic copolymer gel plugging agent in heavy oil steam stimulation thermal recovery.
The high-temperature resistant cationic copolymer gel plugging agent 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 high 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 cationic copolymer based gelling agent comprising: acrylamide/sodium acrylate/cationic monomer copolymer, water-soluble phenolic resin, organic chromium, an oxygen scavenger, a 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 relative 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 gellant system, and is somewhat better able to compete with polyacrylamide-based copolymers during the condensation reaction with water-soluble phenolic 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 cationic copolymer based gel blocking agent.
In the present invention, the kind and amount of the acrylamide/sodium acrylate/cationic monomer copolymer may be selected with reference to the prior art, and the acrylamide/sodium acrylate/cationic monomer copolymer may be synthesized according to the prior art or commercially available. For the present invention, the acrylamide/sodium acrylate/cationic monomer copolymer is preferably one or more of acrylamide/sodium acrylate/acryloyloxyethyl trimethyl ammonium chloride copolymer, acrylamide/sodium acrylate/diallyl dimethyl ammonium chloride copolymer. Wherein the acrylamide/sodium acrylate/diallyldimethylammonium chloride copolymer and the acrylamide/sodium acrylate/acryloyloxyethyltrimethyl ammonium chloride copolymer are commercially available from Shandong Baumo Biochemical industry.
Preferably, the viscosity average molecular weight of the acrylamide/sodium acrylate/cationic monomer copolymer is 600 to 1500 ten thousand, preferably 700 to 1300 ten thousand; the cationic degree of the acrylamide/sodium acrylate/cationic monomer copolymer is 10-20%, preferably 14-18%, and the hydrolysis degree is 8-20%, preferably 10-18%.
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. The cationic degree is determined according to the technical conditions of the cationic polyacrylamide of the water treatment agent of the national standard GB/T31246-2014 and the method for determining the cationic degree in the test method.
Preferably, the acrylamide/sodium acrylate/cationic monomer copolymer 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 cationic copolymer type gel blocking agent.
In the present invention, the water-soluble phenol resin is preferably obtained by polymerizing phenol and formaldehyde monomers in a molar ratio of 0.2 to 0.75 under an alkaline condition. Generally, the water-soluble phenolic resin obtained by the reaction is a solid-liquid mixture with a pH value of more than 11 and a solid content of more than 40 weight percent.
Preferably, the content of the water-soluble phenolic resin is 0.1 to 2 wt%, more preferably 0.2 to 1 wt%, based on the total weight of the high temperature resistant cationic copolymer type gel blocking agent.
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 chromium acid can be prepared by referring to the prior art, and aiming at the invention, one preparation method is that chromium (II) is firstly reacted with sodium nitrite, reduced into chromium (III) and then complexed with 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 the chromium (II) and the sodium nitrite is 1/4-1/3, the molar ratio of the complexation of the reaction of the 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 the chromium (III) is more than 2%.
Preferably, the organic chromium is contained in an amount of 0.01 to 2 wt%, more preferably 0.05 to 1.5 wt%, based on the total weight of the high temperature resistant cationic copolymer-based gelling agent.
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 weight of the oxygen scavenger is 0.05-1 wt% based on the total weight of the high temperature resistant cationic copolymer gel blocking agent.
In the present invention, water is used as the solvent and reaction medium in the high temperature resistant cationic copolymer based gel blocking agent system, and the selection of the solvent and the reaction medium is not particularly limited in 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 content is 94.5 to 99.3 wt%, preferably 96 to 99.35 wt%, based on the total weight of the high temperature resistant cationic copolymer type gel blocking agent.
In the invention, the content of each component in the high-temperature resistant cationic copolymer gel plugging agent is calculated by the feeding amount.
The high-temperature resistant cationic copolymer gel plugging agent 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 phenolic resin and amide groups of the acrylamide/sodium acrylate/cationic monomer copolymer can undergo an in-situ dehydration condensation reaction at high temperature, so that the acrylamide/sodium acrylate/cationic monomer copolymer is crosslinked; meanwhile, the organic chromium in the system is coordinated with the carboxyl of the acrylamide copolymer, so that the acrylamide/sodium acrylate/cationic monomer copolymer is crosslinked, the system gradually forms gel along with the reaction, and a steam channeling pipeline is blocked in the process of steam huff-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 phenol 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 copolymer and the water-soluble phenolic resin, thereby reducing the crosslinking speed of the acrylamide/sodium acrylate/cationic monomer copolymer and enabling the acrylamide/sodium acrylate/cationic monomer copolymer to be subjected to the crosslinking reaction for a long time. Through determination, the high-temperature resistant cationic copolymer gel plugging agent disclosed by the invention can be gelled within two days at a high temperature of 150 ℃ to form plugging.
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/sodium acrylate/cationic monomer copolymer, 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 formation of the crosslinking system, and enables the formed gel system to be stable at a higher temperature.
According to a second aspect of the present invention, there is provided a method for preparing the high temperature resistant cationic copolymer-based gel blocking agent according to the first aspect of the present invention, the method comprising:
(1) dissolving acrylamide/sodium acrylate/cationic monomer copolymer in water to obtain polymer aqueous solution;
(2) and adding water-soluble phenolic resin, organic chromium, a urea compound and an oxygen scavenger into the polymer aqueous solution, and stirring until the mixture is completely dissolved to obtain the high-temperature-resistant cationic copolymer gel plugging agent.
According to a third aspect of the invention, the invention provides application of the high-temperature-resistant cationic copolymer gel plugging agent in heavy oil steam stimulation thermal recovery. As described above, the high temperature resistant cationic copolymer gel plugging agent of the present invention is particularly suitable for plugging a steam channeling pipeline in a steam huff and puff thermal thickened oil recovery process.
According to the invention, the application may comprise: and injecting the high-temperature-resistant cationic copolymer gel plugging agent into the stratum, so that the high-temperature-resistant cationic copolymer gel plugging agent is crosslinked in situ in the stratum to form gel.
Under the environment of steam huff and puff thermal recovery of thickened oil, the gel plugging agent formed by the high-temperature resistant cationic copolymer gel plugging agent 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 cationic copolymer based gel blocking agent and the method of preparation.
At room temperature, 20 g of acrylamide/sodium acrylate/diallyldimethylammonium chloride copolymer (viscosity average molecular weight is 600 ten thousand, cationic degree is 20%, hydrolysis degree is 8%) is dissolved in 1L of water, and the mixture is stirred at 500 r/min until the acrylamide/sodium acrylate/diallyldimethylammonium chloride copolymer is completely dissolved; and then sequentially adding 20 g of water-soluble phenolic resin (the molar ratio of phenol 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 cationic copolymer gel blocking agent.
The blocking performance of the high temperature resistant cationic copolymer gel blocking agent at 150 ℃ for 60 days of standing time was tested, 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 simulated 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 after vacuumizing, and measuring the permeability (k) before core plugging0) (ii) a Then injecting 1.0-1.5PV of the high-temperature-resistant cationic copolymer gel plugging agent of the embodiment into the core model, plugging two ends of the core by using a screw plug, putting the core into a constant temperature box at 150 ℃ for standing for 60 days, injecting water again until the pressure is stable, recording the reading on a pressure gauge to obtain injection pressure difference, and calculating the permeability (k') after the core is plugged, thereby calculating the plugging 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 cationic copolymer based gel blocking agent and the method of preparation.
At room temperature, 6 g of acrylamide/sodium acrylate/acryloyloxyethyl trimethyl ammonium chloride copolymer (viscosity average molecular weight is 1000 ten thousand, cationic degree is 15%, hydrolysis degree is 16%) is dissolved in 1L of water, and the mixture is stirred at the speed of 500 revolutions per minute until the acrylamide/sodium acrylate/acryloyloxyethyl trimethyl ammonium chloride copolymer is completely dissolved; 4 g of water-soluble phenolic resin (the molar ratio of phenol to formaldehyde is 0.3), 2 g of chromium lactate, 2 g of urea and 2 g of isoascorbic acid are added in sequence and stirred until all the components are dissolved, so as to obtain the high-temperature resistant cationic copolymer gel plugging agent of the embodiment.
The blocking rate of the high temperature resistant cationic copolymer gel blocking agent is tested under the conditions of 150 ℃/60 days, 150 ℃/75 days, 150 ℃/90 days, 165 ℃/60 days and 180 ℃/60 days, the test method is the same as that of example 1, and the test results are shown in tables 1 and 2.
Example 3
This example illustrates the high temperature resistant cationic copolymer based gel blocking agent and the method of preparation.
At room temperature, 1.5 g of acrylamide/sodium acrylate/diallyldimethylammonium chloride copolymer (viscosity average molecular weight 1500 ten thousand, cationic degree 10%, degree of hydrolysis 20%) was dissolved in 1L of water, and stirred at 500 rpm until the acrylamide/sodium acrylate/diallyldimethylammonium chloride copolymer was completely dissolved; then, 1 g of water-soluble phenolic resin (the molar ratio of phenol 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 chromium oxalate, the urea and the sodium bisulfite are completely dissolved, and the high-temperature resistant cationic copolymer gel plugging agent is obtained.
The blocking rate of the high temperature resistant cationic copolymer gel blocking agent at 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 cationic copolymer based gel blocking agent and the method of preparation.
At room temperature, 6 g of acrylamide/sodium acrylate/acryloyloxyethyl trimethyl ammonium chloride copolymer (viscosity average molecular weight is 1000 ten thousand, cationic degree is 15%, hydrolysis degree is 16%) is dissolved in 1L of water, and the mixture is stirred at the speed of 500 revolutions per minute until the acrylamide/sodium acrylate/acryloyloxyethyl trimethyl ammonium chloride copolymer is completely dissolved; 4 g of water-soluble phenolic resin (molar ratio of phenol to formaldehyde is 0.3), 2 g of chromium lactate, 5 g of biuret and 2 g of isoascorbic acid are added in sequence and stirred until all the components are dissolved, thus obtaining the high-temperature resistant cationic copolymer gel plugging agent of the embodiment.
The blocking rate of the high temperature resistant cationic copolymer gel blocking agent at 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 cationic copolymer based gel blocking agent and the method of preparation.
At room temperature, 20 g of acrylamide/sodium acrylate/diallyldimethylammonium chloride copolymer (viscosity average molecular weight is 600 ten thousand, cationic degree is 20%, hydrolysis degree is 8%) is dissolved in 1L of water, and the mixture is stirred at 500 r/min until the acrylamide/sodium acrylate/diallyldimethylammonium chloride copolymer is completely dissolved; and then sequentially adding 20 g of water-soluble phenolic resin (the molar ratio of phenol to formaldehyde is 0.3), 20 g of chromium acetate, 20 g of urea and 10 g of sodium thiosulfate, and stirring until the chromium acetate, the urea and the sodium thiosulfate are completely dissolved to obtain the high-temperature resistant cationic copolymer gel blocking agent.
The blocking rate of the high temperature resistant cationic copolymer gel blocking agent at 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, 6 g of acrylamide/sodium acrylate/acryloyloxyethyl trimethyl ammonium chloride copolymer (viscosity average molecular weight is 1000 ten thousand, cationic degree is 15%, hydrolysis degree is 16%) is dissolved in 1L of water, and the mixture is stirred at the speed of 500 revolutions per minute until the acrylamide/sodium acrylate/acryloyloxyethyl trimethyl ammonium chloride copolymer is completely dissolved; 4 g of water-soluble phenolic resin (molar ratio of phenol/formaldehyde is 0.3), 2 g of chromium lactate and 2 g of isoascorbic acid were added in this order and stirred until all were dissolved, to obtain the cationic copolymer-based plugging agent of the comparative example.
The blocking performance of the high temperature resistant cationic copolymer gel blocking agent is tested at the temperature of 150 ℃ and the standing time of 60 days, the test method is the same as that of 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 cationic copolymer based gel blocking agents of examples 1 to 5 have higher blocking rates than the cationic copolymer based gel blocking agent not containing the urea based compound, compared to the cationic copolymer based gel blocking agent not containing the urea based compound of comparative example 1, under the condition of standing at 150 ℃ for 60 days. As can be seen from Table 2, the high temperature resistant cationic copolymer gel plugging agent can stably exist for at least 90 days at 150 ℃, and keeps a higher plugging rate; can be stably stored for at least 60 days when the temperature is increased to 180 ℃. Therefore, the high-temperature-resistant cationic copolymer gel plugging agent 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 (3)
1. The high-temperature-resistant cationic copolymer gel plugging agent is characterized by being prepared by the following method:
at room temperature, 6 g of acrylamide/sodium acrylate/acryloyloxyethyl trimethyl ammonium chloride copolymer is dissolved in 1L of water, and the mixture is stirred at the speed of 500 revolutions per minute until the acrylamide/sodium acrylate/acryloyloxyethyl trimethyl ammonium chloride copolymer is completely dissolved; sequentially adding 4 g of water-soluble phenolic resin, 2 g of chromium lactate, 2 g of urea and 2 g of isoascorbic acid, and stirring until the mixture is completely dissolved; obtaining the high-temperature resistant cationic copolymer gel plugging agent;
wherein the viscosity average molecular weight of the acrylamide/sodium acrylate/acryloyloxyethyl trimethyl ammonium chloride copolymer is 1000 ten thousand, the cationic degree is 15 percent, and the hydrolysis degree is 16 percent; the water-soluble phenolic resin is obtained by the polymerization reaction of phenol and formaldehyde monomers with the molar ratio of 0.3 under the alkaline condition.
2. The application of the high-temperature-resistant cationic copolymer gel plugging agent in thickened oil steam huff-puff thermal recovery.
3. The application of claim 2, wherein the application comprises: and injecting the high-temperature-resistant cationic copolymer gel plugging agent into the stratum, so that the high-temperature-resistant cationic copolymer gel plugging agent is crosslinked in situ in the stratum to form gel.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4485875A (en) * | 1983-02-28 | 1984-12-04 | Marathon Oil Company | Process for selectively plugging permeable zones in a subterranean formation |
| US4834180A (en) * | 1986-10-09 | 1989-05-30 | Mobil Oil Corporation | Amino resins crosslinked polymer gels for permeability profile control |
| CN101586023A (en) * | 2009-07-08 | 2009-11-25 | 中国石油大学(华东) | High-strength pre-crosslinked gel sealing agent for drilling well and preparation method thereof |
| CN107699219A (en) * | 2017-10-25 | 2018-02-16 | 中国石油化工股份有限公司 | High temperature resistance and high strength gel adjusts stifled system and preparation method thereof |
| CN107794013A (en) * | 2016-08-31 | 2018-03-13 | 盘锦百利化工有限公司 | A kind of high temperature resistant plugging agent for heavy crude heat extraction and preparation method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2204431A1 (en) * | 2008-12-18 | 2010-07-07 | Basf Se | Method for blocking subterranean formations |
-
2018
- 2018-10-23 CN CN201811237899.3A patent/CN111087987B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4485875A (en) * | 1983-02-28 | 1984-12-04 | Marathon Oil Company | Process for selectively plugging permeable zones in a subterranean formation |
| US4834180A (en) * | 1986-10-09 | 1989-05-30 | Mobil Oil Corporation | Amino resins crosslinked polymer gels for permeability profile control |
| CN101586023A (en) * | 2009-07-08 | 2009-11-25 | 中国石油大学(华东) | High-strength pre-crosslinked gel sealing agent for drilling well and preparation method thereof |
| CN107794013A (en) * | 2016-08-31 | 2018-03-13 | 盘锦百利化工有限公司 | A kind of high temperature resistant plugging agent for heavy crude heat extraction and preparation method thereof |
| CN107699219A (en) * | 2017-10-25 | 2018-02-16 | 中国石油化工股份有限公司 | High temperature resistance and high strength gel adjusts stifled system and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 聚合物增韧脲醛树脂封堵剂的研究与应用;于培志;《油田化学》;20020330(第01期);全文 * |
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