CN118813226B - High-strength temperature-resistant polymer gel plugging agent and preparation method and application thereof - Google Patents
High-strength temperature-resistant polymer gel plugging agent and preparation method and application thereofInfo
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- CN118813226B CN118813226B CN202310428495.7A CN202310428495A CN118813226B CN 118813226 B CN118813226 B CN 118813226B CN 202310428495 A CN202310428495 A CN 202310428495A CN 118813226 B CN118813226 B CN 118813226B
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
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Abstract
The invention discloses a high-strength temperature-resistant polymer gel plugging agent and a preparation method and application thereof, wherein the high-strength temperature-resistant polymer gel plugging agent is prepared by crosslinking nanometer zirconium hydroxide sol with low-molecular-weight high-concentration acrylamide/2-acrylamide-2-methylpropanesulfonic acid (AM/AMPS) polymer and adding a gel strength enhancer for strengthening, the viscosity of the plugging agent before gel formation is low, the plugging agent after gel formation has extremely high plugging strength, can meet the plugging requirement of a fire flooding heavy oil reservoir at 110-150 ℃, has simple components, is convenient to prepare, can be used only by slowly dissolving three components in water and uniformly stirring, is environment-friendly, saves time and economic cost, and has extremely high use value.
Description
Technical Field
The invention belongs to the technical field of oilfield chemistry, and particularly relates to a high-strength temperature-resistant polymer gel plugging agent, a preparation method and application thereof.
Background
The fireflood technology is the most potential recovery technology for heavy oil reservoir development. The technology generates a large amount of heat and flue gas by burning part of crude oil components on site, and under the combined action of heat and flue gas, crude oil is modified, reduced in viscosity and enhanced in fluidity, and the crude oil is moved to the production well end and extracted under the multiple actions of steam flooding, hot water flooding, flue gas flooding and the like. However, high-fluidity components such as flue gas, steam and the like in the fireflood process are easy to enter along a hypertonic reservoir or crack, namely 'fireflood', so that the fireflood sweep range is seriously influenced, and the petroleum recovery ratio is influenced. Effective plugging agents are needed to plug hypertonic reservoirs and fractures to ensure uniform advancement of the fireflood front, increase fireflood sweep area, and further enhance heavy oil recovery.
Polymer gel is one of the most popular plugging agents for reservoir plugging in recent years, and the gel used in fireflood reservoirs needs to have excellent temperature resistance and strength. In general, the temperature resistant gel is prepared by using an organic crosslinking agent such as phenol, formaldehyde, hydroquinone, urotropine, etc. which can react with the polymer to form covalent bonds. However, many components such as particle reinforcing agents such as nano silicon dioxide and clay, catalysts, deoxidizers and pH regulators are often added into the gel to adjust the performance of the gel, so that the gel has complex components and is extremely inconvenient in practical application. Conventional inorganic cross-linked gels are typically prepared by cross-linking polymers using metal ion cross-linking agents such as chromium acetate, chromium chloride, and the like. However, the jelly is often difficult to use in a fireflood reservoir due to the factors of too fast cross-linking, poor temperature resistance and the like. In addition, phenolic and chromium crosslinking agents have a certain toxicity, and their use is gradually limited.
The Chinese patent application with publication number CN109280542A published in1 month 29 of 2019 provides a high-temperature-resistant gel plugging agent, a preparation method and application thereof, wherein the plugging agent consists of sulfonated modified polysaccharide, an initiator, a small molecular monomer, an aldehyde cross-linking agent A, a cross-linking agent B, a curing agent, a pH regulator and water, is resistant to temperature of 150-200 ℃, and can meet the pressure requirement of snubbing serving. The Chinese patent application with publication number CN106867485A published in 6/20/2017 provides an antihyperlipidemic Wen Dulou agent, a preparation method and application thereof. The plugging agent consists of polyacrylamide, sulfonated phenolic resin, hexamethylenetetramine, a water-swelling particle plugging agent, a unidirectional pressure plugging agent, an alkaline pH regulator and water, and can resist the temperature of 80-150 ℃ and meet the plugging requirement of drilling. The Chinese patent application with publication number CN105131921A published in 12 month 9 2015 provides a salt-resistant high-temperature-resistant high-strength gel water shutoff agent which consists of a sulfonated modified small molecular biopolymer, a small molecular acrylamide, a sodium methylpropanesulfonate polymer, a phenolic resin compound cross-linking agent and a pH regulator. The plugging agent has the gel strength of 4X 104-10X 104 mPa.s at 120 ℃ and 20X 104mg/L, and can meet the water plugging requirement of a horizontal well of a bottom water sandstone reservoir. The Chinese patent application with publication number CN1315978C published in 8 month 17 2005 provides a wood chip gel depth plugging agent for plugging a thick oil layer high-permeability zone by a water injection well, wherein the plugging agent consists of anionic polyacrylamide, phenol compound polyamine, resorcinol, oxalic acid, wood chip and water, and has the advantages of low cost, high gel forming strength and controllable gel forming time. It can be seen that the plugging agent has more components, complex preparation process and a certain toxicity, and contains phenolic cross-linking agents.
Aiming at reservoirs with the problem of fire channeling, particularly reservoirs with cracks developing, a gel plugging agent with low viscosity before gel formation, high strength after gel formation and temperature resistance needs to be developed so as to ensure that the gel can smoothly enter the fire channeling area and form effective plugging. In general, the high-strength gel is prepared mainly by adding reinforcing agents such as nano particles and clay or the like or increasing the concentration of a main agent. However, the main agent for preparing the gel is often a high molecular polymer, the excessive use level can cause excessive viscosity of the gel-forming liquid and poor injectability, and the low use level can not form high-strength gel, so that the blocking effect is difficult to ensure. The use of enhancers such as clay and nanoparticles is also limited by viscosity, temperature, mineralization and other factors. Therefore, how to prepare gel with low viscosity, high gel strength and temperature resistance is still a technical problem.
Therefore, the problems of complex components, toxicity, high viscosity before gel formation, low strength after gel formation and poor temperature resistance of the conventional gel plugging agent are required to be solved at present.
Disclosure of Invention
The invention aims to solve the problems of complex components, toxicity, high viscosity before gel formation, low strength after gel formation and no temperature resistance of the conventional gel plugging agent, and provides a high-strength temperature-resistant polymer gel plugging agent, a preparation method and application thereof.
In order to achieve the above purpose, the invention adopts the following technical scheme:
according to the mass percent, 1% -3% of low molecular weight acrylamide/2-acrylamide-2-methylpropanesulfonic acid polymer, 0.5% -2% of gel strength enhancer, 1.5% -10% of nano zirconium hydroxide sol and 85% -97% of water are mixed and stirred to obtain gel glue, namely the high-strength temperature-resistant polymer gel plugging agent.
Further, the gel strength enhancer is polyvinyl alcohol fiber.
Further, the length of the polyvinyl alcohol fiber is 1-3mm.
Further, the molecular weight of the low molecular weight acrylamide/2-acrylamide-2-methylpropanesulfonic acid polymer was 1X 10 6g/mol～2×106 g/mol.
Further, the mass fraction of the 2-acrylamide-2-methylpropanesulfonic acid in the low molecular weight acrylamide/2-acrylamide-2-methylpropanesulfonic acid polymer is 60%.
Further, the solid content of the nano zirconium hydroxide sol is 20%.
Further, the particle size of the nano zirconium hydroxide sol is 5-25nm.
The high-strength temperature-resistant polymer gel plugging agent comprises, by mass, 1% -3% of a low-molecular-weight acrylamide/2-acrylamide-2-methylpropanesulfonic acid polymer, 0.5% -2% of polyvinyl alcohol fibers, 1.5% -10% of nano zirconium hydroxide sol and 85% -97% of water.
Further, the molecular weight of the low molecular weight acrylamide/2-acrylamide-2-methylpropanesulfonic acid polymer is 1X 10 6g/mol～2×106 g/mol, and the solid content of the nano zirconium hydroxide sol is 20%.
The application of the high-strength temperature-resistant polymer gel plugging agent in a fireflood development oil reservoir can be used for plugging fireflood heavy oil reservoirs at 110-150 ℃.
Compared with the prior art, the invention has the following beneficial technical effects:
The invention is prepared by crosslinking nano zirconium hydroxide sol with low molecular weight and high concentration acrylamide/2-acrylamide-2-methylpropanesulfonic acid (AM/AMPS) polymer and adding strength enhancer for strengthening, the plugging agent has low viscosity before forming glue and extremely high plugging strength after forming glue, can meet the plugging requirement of fire flooding thick oil reservoirs at 110-150 ℃, has simple components, is convenient to prepare, can be used only by slowly dissolving three components in water and uniformly stirring, saves time and economic cost, is environment-friendly, and has extremely high use value.
The AM/AMPS polymer used in the invention is a low molecular weight polymer, the polymer is a main agent of a high-strength temperature-resistant polymer gel plugging agent, and carboxylate radicals generated by hydrolysis of the low molecular AM/AMPS polymer at high temperature can react with zirconium hydroxide to form coordination bonds, so that a three-dimensional network structure is formed. The low molecular AM/AMPS polymer has low molecular weight, weak entanglement between molecular chains and low viscosity of the glue solution after being dissolved in water. Therefore, the use of the AM/AMPS polymer with low molecular weight and high concentration for preparing the gel can not only increase the dosage of the main agent and further increase the strength of the gel, but also ensure that the gel-forming liquid has good injectability. In addition, the AM/AMPS polymer does not contain carboxylate radicals, and can not be crosslinked with zirconium hydroxide when being prepared into glue solution, and AM in the polymer is gradually hydrolyzed to form carboxylate radicals along with the glue solution being injected into a high-temperature reservoir, so that the AM/AMPS polymer is crosslinked with zirconium hydroxide to form high-strength gel, and fire channeling is blocked. The invention can effectively control the crosslinking time of the gel by utilizing the reaction mechanism, so that the gel can form a plug at a proper position in a reservoir.
The AMPS group utilized by the invention has better temperature resistance, and the AM group is easier to hydrolyze to generate carboxylate radicals and react with zirconium ions, so that the AMPS content is controlled to 60 percent, thereby ensuring that the gel has good temperature resistance, simultaneously controlling the number of carboxylate radicals generated in the polymer, controlling the crosslinking degree of the gel, and preventing the gel from shrinking due to excessive crosslinking.
The gel strength enhancer disclosed by the invention adopts the polyvinyl alcohol fibers, the polyvinyl alcohol fibers can be uniformly dispersed in water, the hydrated polyvinyl alcohol fibers can form an entangled structure with an AM/AMPS (active matrix/amorphous-poly-styrene) cross-linked network under the action of zirconium ions, the gel grid is enhanced, the capability of buffering stress of the gel is enhanced, the capability of bearing liquid or gas breakthrough of a system can be improved, and the formed gel can keep high plugging capability in cracks or near-wellbore regions.
The nanometer zirconium hydroxide sol used in the invention is not only a cross-linking agent, but also a nanometer sol stabilizer, and has double functions. On the one hand, the zirconium hydroxide sol is used as a cross-linking agent to react with carboxylate radical generated by gradual hydrolysis of a polymer to form a coordination bond, so that a high-strength gel network is formed, and on the other hand, the nano zirconium hydroxide sol is used as a stabilizing agent to generate hydrogen bond action with groups such as amide radical, sulfonate radical and the like in polymer molecules, so that the gel strength and stability are further improved. The preparation process of the gel is simplified, and the stabilizer is not needed to be added besides the cross-linking agent. In addition, the zirconium hydroxide sol is environment-friendly, and chromium and aldehyde crosslinking agents are avoided.
The gel prepared by the invention has low viscosity before gel formation, high strength after gel formation and excellent channeling sealing capability. Experiments show that the viscosity of the gel forming liquid is less than 500 mPa.s, and the strength of the gel forming liquid after gel forming at 110 ℃ can reach more than 150Pa and is far higher than the standard (10 Pa) of the strong gel. Physical simulation experiments show that the plugging pressure gradient of the porous medium can reach more than 60MPa/m, and the plugging pressure gradient is more than 10MPa/m in cracks.
Detailed Description
The present invention is explained in further detail below:
A high-strength temperature-resistant polymer gel plugging agent comprises, by mass, 1% -3% of low-molecular-weight AM/AMPS polymer, 0.5% -2% of polyvinyl alcohol fiber, 1.5% -10% of nano zirconium hydroxide sol and the balance of water (85% -97%).
A preparation method of a high-strength temperature-resistant polymer gel plugging agent comprises the steps of mixing and stirring 1% -3% of low-molecular acrylamide/2-acrylamide-2-methylpropanesulfonic acid polymer, 0.5% -2% of polyvinyl alcohol fiber, 1.5% -10% of nano zirconium hydroxide sol and 85% -97% of water according to mass percentage to obtain gel-forming liquid, namely the high-strength temperature-resistant polymer gel plugging agent
The AM/AMPS polymer in the invention is a low molecular weight polymer, the average molecular weight is 1 multiplied by 10 6g/mol～2×106 g/mol, and the mass fraction of the AMPS is 60%. The polymer is a main agent of a high-strength gel plugging agent, and carboxylate radicals generated by hydrolysis of the polymer at high temperature can react with zirconium hydroxide to form coordination bonds, so that a three-dimensional network structure is formed. The polymer has low molecular weight, weak entanglement between molecular chains, and low viscosity of the glue solution after being dissolved in water. Therefore, the use of the AM/AMPS polymer with low molecular weight and high concentration for preparing the gel can not only increase the dosage of the main agent and further increase the strength of the gel, but also ensure that the gel-forming liquid has good injectability. In addition, the AM/AMPS polymer does not contain carboxylate radicals, and can not be crosslinked with zirconium hydroxide when being prepared into glue solution, and AM in the polymer is gradually hydrolyzed to form carboxylate radicals along with the glue solution being injected into a high-temperature reservoir, so that the AM/AMPS polymer is crosslinked with zirconium hydroxide to form high-strength gel, and fire channeling is blocked. The invention can effectively control the crosslinking time of the gel by utilizing the reaction mechanism, so that the gel can form a plug at a proper position in a reservoir. In addition, the AMPS group has better temperature resistance, and the AM group is easier to hydrolyze to generate carboxylate radicals and react with zirconium ions, so that the mass fraction of the AMPS is controlled at 60% to ensure that the gel has good temperature resistance, and simultaneously, the quantity of carboxylate radicals generated in the polymer is controlled, the degree of gel crosslinking is controlled, and the shrinkage of the gel caused by excessive crosslinking can be prevented.
The length of the polyvinyl alcohol fiber in the invention is 1-3mm, and the polyvinyl alcohol fiber is a gel strength enhancer. The polyvinyl alcohol fiber can be uniformly dispersed in water, the hydrated polyvinyl alcohol fiber can form an entangled structure with an AM/AMPS cross-linked network under the action of zirconium ions, the jelly network is strengthened, the capacity of buffering stress of the jelly is enhanced, the capacity of the system for bearing liquid or gas breakthrough can be improved, and the formed jelly can keep high plugging capacity in cracks or near-wellbore zones.
The solid content of the nano zirconium hydroxide sol is 20%, and the particle size of the nano zirconium hydroxide sol is 5-25nm. The preparation method comprises the steps of weighing 15-16% of zirconium acetate by mass, mixing the zirconium acetate with deionized water according to a mass ratio of 1:1, heating and stirring the mixture in an oil bath at 70 ℃ for 10min to completely dilute the zirconium acetate, then adjusting the pH value of the solution to 5 by using 25% of ammonia water, heating and stirring the solution at 70 ℃ for a period of time until the white suspension is completely converted into colorless transparent sol, and finally standing and aging the solution for 24h to obtain the nano zirconium hydroxide sol.
The nano zirconium hydroxide sol is not only a cross-linking agent, but also a nano sol stabilizer, and has double functions. On the one hand, the nano zirconium hydroxide sol is used as a cross-linking agent to react with carboxylate generated by gradual hydrolysis of a polymer to form a coordination bond, so that a high-strength gel network is formed, and on the other hand, the nano zirconium hydroxide sol is used as a stabilizing agent to generate hydrogen bond action with groups such as amide groups, sulfonate groups and the like in polymer molecules, so that the gel strength and stability are further improved. The preparation process of the gel is simplified, and the stabilizer is not needed to be added besides the cross-linking agent. In addition, the nano zirconium hydroxide sol is environment-friendly, and chromium and aldehyde crosslinking agents are avoided.
The application of the high-strength temperature-resistant polymer gel plugging agent in the fireflood development oil reservoir can be used for plugging fireflood heavy oil reservoir firechanneling at 110-150 ℃.
The invention is described in further detail below with reference to examples:
example 1
Weighing 15-16% by mass of zirconium acetate, mixing the zirconium acetate with deionized water according to a mass ratio of 1:1, heating and stirring the mixture in an oil bath at 70 ℃ for 10min to completely dilute the zirconium acetate, then adjusting the pH of the solution to 5 by using 25% ammonia water, heating and stirring the solution for a period of time at 70 ℃ until the white suspension is completely converted into colorless transparent sol, and finally standing and aging the solution for 24h to obtain the nano zirconium hydroxide sol.
97G of water is weighed and placed in a beaker, 1g of low-molecular AM/AMPS polymer, 0.5g of polyvinyl alcohol fiber and 1.5g of nano zirconium hydroxide sol with 20% of solid content are sequentially and slowly added under stirring at 400rpm by using an electric stirrer, and then the rotating speed is reduced to 150rpm and stirred for 2 hours, so that uniform gel glue is obtained.
Example 2
Weighing 15-16% by mass of zirconium acetate, mixing the zirconium acetate with deionized water according to a mass ratio of 1:1, heating and stirring the mixture in an oil bath at 70 ℃ for 10min to completely dilute the zirconium acetate, then adjusting the pH of the solution to 5 by using 25% ammonia water, heating and stirring the solution for a period of time at 70 ℃ until the white suspension is completely converted into colorless transparent sol, and finally standing and aging the solution for 24h to obtain the nano zirconium hydroxide sol.
92G of water is weighed and placed in a beaker, 2g of low-molecular AM/AMPS polymer, 1g of polyvinyl alcohol fiber and 5g of nano zirconium hydroxide sol with the solid content of 20% are sequentially and slowly added while stirring at the speed of 400rpm by using an electric stirrer, and then the rotating speed is reduced to 150rpm and stirred for 2 hours, so that uniform gel-forming liquid is obtained.
Example 3
Weighing 15-16% by mass of zirconium acetate, mixing the zirconium acetate with deionized water according to a mass ratio of 1:1, heating and stirring the mixture in an oil bath at 70 ℃ for 10min to completely dilute the zirconium acetate, then adjusting the pH of the solution to 5 by using 25% ammonia water, heating and stirring the solution for a period of time at 70 ℃ until the white suspension is completely converted into colorless transparent sol, and finally standing and aging the solution for 24h to obtain the nano zirconium hydroxide sol.
85G of water is weighed and placed in a beaker, 3g of low-molecular AM/AMPS polymer, 2g of polyvinyl alcohol fiber and 10g of nano zirconium hydroxide sol with the solid content of 20% are sequentially and slowly added under stirring at 400rpm by using an electric stirrer, and then the rotating speed is reduced to 150rpm and stirred for 2 hours, so that uniform gel-forming glue solution is obtained.
Comparative example 1 (without addition of polyvinyl alcohol fiber)
Weighing 15-16% by mass of zirconium acetate, mixing the zirconium acetate with deionized water according to a mass ratio of 1:1, heating and stirring the mixture in an oil bath at 70 ℃ for 10min to completely dilute the zirconium acetate, then adjusting the pH of the solution to 5 by using 25% ammonia water, heating and stirring the solution for a period of time at 70 ℃ until the white suspension is completely converted into colorless transparent sol, and finally standing and aging the solution for 24h to obtain the nano zirconium hydroxide sol.
97.5G of water is weighed and placed in a beaker, 1g of low-molecular AM/AMPS polymer and 1.5g of nano zirconium hydroxide sol with 20% of solid content are sequentially and slowly added under the stirring of an electric stirrer at the rotation speed of 400rpm, and then the rotation speed is reduced to 150rpm and the stirring is carried out for 2 hours, so that uniform gel forming liquid is obtained.
Comparative example 2 (Low molecular weight AM/AMPS Polymer used in Low levels)
Weighing 15-16% by mass of zirconium acetate, mixing the zirconium acetate with deionized water according to a mass ratio of 1:1, heating and stirring the mixture in an oil bath at 70 ℃ for 10min to completely dilute the zirconium acetate, then adjusting the pH of the solution to 5 by using 25% ammonia water, heating and stirring the solution for a period of time at 70 ℃ until the white suspension is completely converted into colorless transparent sol, and finally standing and aging the solution for 24h to obtain the nano zirconium hydroxide sol.
97.5G of water is weighed and placed in a beaker, 0.5g of low-molecular AM/AMPS polymer, 0.5g of polyvinyl alcohol fiber and 1.5g of nano zirconium hydroxide sol with 20% of solid content are sequentially and slowly added under stirring at 400rpm by using an electric stirrer, and then the rotating speed is reduced to 150rpm and stirred for 2 hours, so that uniform gel-forming liquid is obtained.
Comparative example 3 (Nano zirconium hydroxide sol Low dosage)
Weighing 15-16% by mass of zirconium acetate, mixing the zirconium acetate with deionized water according to a mass ratio of 1:1, heating and stirring the mixture in an oil bath at 70 ℃ for 10min to completely dilute the zirconium acetate, then adjusting the pH of the solution to 5 by using 25% ammonia water, heating and stirring the solution for a period of time at 70 ℃ until the white suspension is completely converted into colorless transparent sol, and finally standing and aging the solution for 24h to obtain the nano zirconium hydroxide sol.
98G of water is weighed and placed in a beaker, 1g of low-molecular AM/AMPS polymer, 0.5g of polyvinyl alcohol fiber and 0.5g of nano zirconium hydroxide sol with 20% of solid content are sequentially and slowly added under stirring at 400rpm by using an electric stirrer, and then the rotating speed is reduced to 150rpm and stirred for 2 hours, so that uniform gel glue is obtained.
Comparative example 4 (high amounts of low molecular AM/AMPS polymer and polyvinyl alcohol fiber)
Weighing 15-16% by mass of zirconium acetate, mixing the zirconium acetate with deionized water according to a mass ratio of 1:1, heating and stirring the mixture in an oil bath at 70 ℃ for 10min to completely dilute the zirconium acetate, then adjusting the pH of the solution to 5 by using 25% ammonia water, heating and stirring the solution for a period of time at 70 ℃ until the white suspension is completely converted into colorless transparent sol, and finally standing and aging the solution for 24h to obtain the nano zirconium hydroxide sol.
83G of water is weighed and placed in a beaker, 4g of low-molecular AM/AMPS polymer, 3g of polyvinyl alcohol fiber and 10g of nano zirconium hydroxide sol with the solid content of 20% are sequentially and slowly added under stirring at 400rpm by using an electric stirrer, and then the rotating speed is reduced to 150rpm and stirred for 2 hours, so that uniform gel-forming glue solution is obtained.
Comparative example 5 (Using high molecular weight AM/AMPS Polymer)
Weighing 15-16% by mass of zirconium acetate, mixing the zirconium acetate with deionized water according to a mass ratio of 1:1, heating and stirring the mixture in an oil bath at 70 ℃ for 10min to completely dilute the zirconium acetate, then adjusting the pH of the solution to 5 by using 25% ammonia water, heating and stirring the solution for a period of time at 70 ℃ until the white suspension is completely converted into colorless transparent sol, and finally standing and aging the solution for 24h to obtain the nano zirconium hydroxide sol.
97G of water is weighed and placed in a beaker, 1g of AM/AMPS polymer with the molecular weight of 8 multiplied by 10 6 g/mol, 0.5g of polyvinyl alcohol fiber and 1.5g of nano zirconium hydroxide sol with the solid content of 20% are sequentially and slowly added under stirring at 400rpm by using an electric stirrer, and then the rotating speed is reduced to 150rpm and stirred for 2 hours, so that uniform gel-forming glue solution is obtained.
Test example 1
The testing method is that the viscosity of the prepared gel glue solution at 7.34s -1 is measured by using an Anton Paar MCR92 rheometer at room temperature. And then subpackaging the gel forming liquid, sealing the gel forming liquid and an ampoule bottle, placing parallel gel samples into an oven at 110 ℃ and 150 ℃ respectively, aging for 24 hours, and measuring the storage modulus of the gel after normal-temperature cooling by using an Anton Paar MCR92 rheometer after gel forming. The higher the storage modulus of the gel, the higher the gel strength, and generally the gel with the storage modulus of more than 10Pa is called a strong gel. The evaluation results are shown in Table 1.
TABLE 1 viscosity of gel-forming solution and storage modulus of gel
Test example 2
Blocking ability of jelly in hypertonic porous medium
The blocking capacity of the gel in the high-permeability porous medium is evaluated by using a material model test, and the method is tested by using ① to prepare a sand filling pipe with the length of 20cm, the inner diameter of 2.5cm and the permeability of about 5000 multiplied by 10 < -3 > mu m < 2 > by using quartz sand. ② The permeability of the sand pack is measured and the formation water is saturated. ③ Gel of 1PV was injected at an injection rate of 100mL/h to form a gel, and then both ends of the sand filling pipe were sealed and placed in a 110℃oven for aging for 24h to be set. ④ After gel is formed, gel at two ends of the sand filling pipe and in the pipeline is cleaned, water is injected from one end of the sand filling pipe in the same direction, and pressure difference at two ends of the sand filling pipe is measured. ⑤ And recording the pressure difference when the first drop of water appears at the outlet end of the sand filling pipe and the subsequent continuous water is discharged, and recording the pressure difference as the breakthrough pressure of the gel. The higher the breakthrough pressure, the greater the strength of the gel.
Plugging ability of jelly in cracks
And (3) changing the sand filling pipe into a pipeline model with the inner diameter of 1mm and the length of 1m to simulate cracks, repeating the step ③-⑤, and evaluating the plugging capability of the gel in the cracks. The evaluation results are shown in Table 2.
Table 2 blocking ability of gels
The embodiment shows that the gel strength is increased along with the increase of AM/AMPS polymer, polyvinyl alcohol fiber and nano zirconium hydroxide sol, and the preferable concentration of the components is 1% -3% of AM/AMPS polymer, 0.5% -2% of polyvinyl alcohol fiber and 0.3% -2% of nano zirconium hydroxide sol. As can be seen from comparative examples 1 to 3, when the amount of any one of the 3 components is too small, the gel strength is lowered and the gel blocking performance is lowered. As can be seen from comparative example 4, when the amount of each component of the gel is too large, the viscosity of the gel-forming liquid is increased, the injection difficulty is increased, the strength rise amplitude is reduced, and the cost performance of continuously increasing the concentration of each component is reduced. As can be seen from comparative example 5, the viscosity of the gel-forming solution prepared by polymerization with high molecular weight was too high, the injection was difficult, and the polymer concentration was only 1%, and it was difficult to continue increasing the amount.
It should be finally understood that the foregoing embodiments are merely illustrative of the technical solutions of the present invention and not limiting the scope of protection thereof, and although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that various changes, modifications or equivalents may be made to the specific embodiments of the invention, and these changes, modifications or equivalents are within the scope of protection of the claims appended hereto.
Claims (8)
1. A preparation method of a high-strength and temperature-resistant polymer gel plugging agent is characterized in that 1% -3% of low-molecular-weight acrylamide/2-acrylamide-2-methylpropanesulfonic acid polymer, 0.5% -2% of gel strength enhancer, 1.5% -10% of nano zirconium hydroxide sol and 85% -97% of water are mixed and stirred according to mass percentage to obtain gel-forming liquid, namely the high-strength and temperature-resistant polymer gel plugging agent;
The gel strength enhancer adopts polyvinyl alcohol fiber, and the molecular weight of the low molecular weight acrylamide/2-acrylamide-2-methylpropanesulfonic acid polymer is 1 multiplied by 10 6 g/mol ~2 ×106 g/mol.
2. The method for preparing the high-strength and temperature-resistant polymer gel plugging agent according to claim 1, wherein the length of the polyvinyl alcohol fiber is 1-3mm.
3. The preparation method of the high-strength and temperature-resistant polymer gel plugging agent according to claim 1, wherein the mass fraction of 2-acrylamide-2-methylpropanesulfonic acid in the low-molecular-weight acrylamide/2-acrylamide-2-methylpropanesulfonic acid polymer is 60%.
4. The method for preparing the high-strength and temperature-resistant polymer gel plugging agent according to claim 1, wherein the solid content of the nano zirconium hydroxide sol is 20%.
5. The method for preparing the high-strength and temperature-resistant polymer gel plugging agent according to claim 1, wherein the particle size of the nano zirconium hydroxide sol is 5-25 nm.
6. The high-strength temperature-resistant polymer gel plugging agent is characterized by comprising, by mass, 1% -3% of a low-molecular-weight acrylamide/2-acrylamide-2-methylpropanesulfonic acid polymer, 0.5% -2% of polyvinyl alcohol fibers, 1.5% -10% of a nano zirconium hydroxide sol and 85% -97% of water, wherein the molecular weight of the low-molecular-weight acrylamide/2-acrylamide-2-methylpropanesulfonic acid polymer is 1X 10 6 g/mol ~2 ×106 g/mol.
7. The high-strength and temperature-resistant polymer gel plugging agent according to claim 6, wherein the solid content of the nano zirconium hydroxide sol is 20%.
8. The application of the high-strength temperature-resistant polymer gel plugging agent in fireflood development oil reservoirs, which is characterized in that the plugging agent can plug fireflood heavy oil reservoirs at 110-150 ℃.
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| CN103980872A (en) * | 2014-05-15 | 2014-08-13 | 中国地质大学（北京） | Environmental-friendly gel plugging agent applicable to low-temperature oil pool and applications of gel plugging agent |
| CN111574978A (en) * | 2020-06-24 | 2020-08-25 | 中国石油大学(华东) | Jelly plugging agent, preparation method and application thereof |
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| CN111088023B (en) * | 2018-10-23 | 2022-01-04 | 中国石油化工股份有限公司 | High-temperature-resistant polyacrylamide gel plugging agent and preparation method and application thereof |
| CN114316932B (en) * | 2020-10-09 | 2023-05-09 | 中国石油化工股份有限公司 | A temperature-resistant strong resident plugging agent |
| CN113249102B (en) * | 2021-04-09 | 2022-12-27 | 中国石油大学(华东) | Slow cross-linking gel for profile control of medium-high temperature oil reservoir and preparation method thereof |
| CN113416528B (en) * | 2021-06-22 | 2022-10-28 | 西南石油大学 | Organic/inorganic nano composite gel plugging agent and oil-based drilling fluid |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103980872A (en) * | 2014-05-15 | 2014-08-13 | 中国地质大学（北京） | Environmental-friendly gel plugging agent applicable to low-temperature oil pool and applications of gel plugging agent |
| CN111574978A (en) * | 2020-06-24 | 2020-08-25 | 中国石油大学(华东) | Jelly plugging agent, preparation method and application thereof |
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