CN112521560A - Efficient salt-resistant one-agent dual-purpose thickening agent and preparation method and application thereof - Google Patents
Efficient salt-resistant one-agent dual-purpose thickening agent and preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a high-efficiency salt-resistant one-agent dual-purpose thickening agent, a preparation method and application thereof, wherein the preparation method of the thickening agent comprises the steps of S1 preparation of a water phase; s2, preparing an oil phase; s3, emulsification; polymerizing S4; and S5 post-processing. The hydrophobic monomer, the functional monomer and the salt-resistant monomer are introduced into the thickening agent, a spatial network structure with a compact and complex structure is formed in an aqueous solution, the thermal stability and the salt resistance of the thickening agent are improved, and the aqueous solution can keep higher viscosity under the condition of high mineralization degree. And the addition of the chain extender enables the molecular chain of the polymer to be longer and the viscosity to be greatly improved. The introduction of the cosolvent can further improve the dissolution speed of the polymer emulsion, can be completely dissolved within 30 seconds, has low requirement on water quality, and can be prepared from oilfield reinjection water and oilfield wastewater. The addition of the suspending agent ensures that an emulsion system is more stable, and the emulsion can not be layered within 2 years. The thickening agent also has the characteristic of dual purposes of one agent, and can be used as a fracturing fluid slickwater drag reducer and a fracturing fluid thickening agent.
Description
Technical Field
The invention belongs to the technical field of oil field enhanced recovery, and particularly relates to an efficient salt-resistant dual-purpose thickener with one agent, and a preparation method and application thereof.
Background
The proportion of low-permeability oil-gas resources in China is more than 50%, and the low-permeability oil-gas resources become the main exploration and development objects in China at present. Because the low-permeability reservoir is influenced by factors such as large buried depth, high formation temperature, high formation water mineralization degree, strong diagenesis and compaction effect and the like, effective development can be realized only by production increase modification measures such as fracturing, acidizing, acid fracturing and the like. At present, the fracturing production increasing technology is an important means for oil and gas field development.
The demand for high-performance fracturing fluid is increased by the expansion of the American shale gas fracturing market and the market demand for increasing petroleum demand at home and abroad. In recent years, the clean fracturing fluid technology, the polymer fracturing fluid technology and the low molecular polymer fracturing technology gradually replace the traditional guar gum fracturing fluid technology. Meanwhile, due to the progress of the fracturing fluid technology and the requirements of oil field construction, the online fracturing fluid construction technology is rapidly developed, a liquid preparation station, a preparation pool or other preparation equipment is not needed in the technology, high-content concentrated liquid active chemical substances are directly pumped to a sand mixing truck in a mode of online adding on site through a gear pump according to the proportion, a propping agent and water are added, and the water, the propping agent and the chemical substances are mixed together according to the proportion under the stirring of the sand mixing truck. However, because the effects of the drag reducer and the thickening agent are different, the agents are frequently switched in the oil field construction process, which brings certain inconvenience to the site construction. Therefore, higher requirements are put on the fracturing fluid medicament, and the fracturing fluid medicament is required to have not only excellent resistance reduction performance but also high-viscosity sand suspending performance. Therefore, the efficient salt-resistant one-agent dual-purpose thickening agent has important significance for oil field development.
Disclosure of Invention
Aiming at the technical problems, the invention provides a high-efficiency salt-resistant dual-purpose thickening agent, and a preparation method and application thereof.
The technical scheme adopted by the invention is as follows:
the invention firstly discloses a preparation method of a high-efficiency salt-resistant one-agent dual-purpose thickening agent, which comprises the following steps:
s1, preparing a water phase: uniformly mixing 160 parts by weight of 120-plus-one acrylamide, 60-80 parts by weight of acrylic acid, 80-120 parts by weight of 2-acrylamido-2-methylpropanesulfonic acid, 5-10 parts by weight of functional monomer, 1-4 parts by weight of hydrophobic monomer, 3-6 parts by weight of chain extender, 2-5 parts by weight of cosolvent and 340 parts by weight of water, adjusting the pH value to 6.5-6.7 by using a pH regulator, and uniformly mixing to obtain a water phase;
s2, preparing an oil phase: uniformly mixing 240 parts of white oil 200-one, 20-35 parts of main emulsifier, 4-7 parts of auxiliary emulsifier and 3-6 parts of suspending agent by weight to obtain an oil phase;
s3, emulsification: sequentially adding a water phase, an oil phase and an initiator into a mixing kettle, controlling the rotating speed at 500rpm/min in the adding process, stirring for 1.5-2.5 h at room temperature, and cooling to 15-25 ℃ to obtain an emulsion;
s4, polymerization: introducing nitrogen into the emulsion obtained in the S3 to remove oxygen, controlling the temperature at 45-50 ℃, and adding a reducing agent to initiate polymerization; the stirring speed is always kept at 150rpm/min during the polymerization reaction,
s5, post-processing: and after the polymerization reaction is finished, adding 23-33 parts of fatty alcohol-polyoxyethylene ether, and uniformly stirring to obtain light yellow semitransparent liquid, namely the high-efficiency salt-resistant one-agent dual-purpose thickening agent.
Further, the functional monomer is prepared from a grafting monomer and dimethylaminoethyl methacrylate according to the molar ratio of 1: 1; wherein the grafting monomer is one or a mixture of two or more than two of N-tertiary butyl-2-methylbenzamide, 2- (chloromethyl) benzoyl chloride and 2-methylbenzamide in any proportion.
Specifically, the preparation method of the functional monomer comprises the following steps: uniformly mixing dimethylaminoethyl methacrylate and solvent water according to a ratio, introducing nitrogen to remove oxygen, heating to 50 ℃ under the stirring condition of the rotating speed of 100rpm/min, continuously introducing nitrogen to protect, beginning to dropwise add the grafting monomer at the water bath temperature of 50-70 ℃, controlling the dropwise adding time within 2 hours, and obtaining the functional monomer after the reaction is finished;
wherein the dosage of the solvent water is 20 percent of the total mass of the functional monomer.
Preferably, the hydrophobic monomer is one or a mixture of two or more of N-tert-butyl acrylamide, methyl methacrylate, styrene, N-dodecyl acrylamide and octadecyl dimethyl allyl ammonium chloride in any proportion.
Preferably, the chain extender is one or a mixture of two or more of polyethylene glycol diacrylate, polyethylene glycol dimethacrylate, polypropylene glycol diacrylate, polypropylene glycol dimethacrylate and polyglycerol acrylate in any proportion.
Preferably, the cosolvent is one of fatty alcohol polyoxyethylene ether AEO-15 and isomeric tridecanol polyoxyethylene ether 1310 or a mixture of the isomeric tridecanol polyoxyethylene ether 1310 in any proportion.
Preferably, the main emulsifier is a composite emulsifier system and is prepared from Tween 80 and Span65 according to the mass ratio of 1: 5.
Preferably, the coemulsifier is n-octanol and ethylene glycol in a ratio of 7: 3 in a mass ratio.
Preferably, the suspending agent is one of hydrophobic silica, modified hectorite or a mixture thereof.
Preferably, the initiator is a composite initiation system and comprises an azo initiator and an oxidant, wherein the addition amount of the azo initiator is 0.01-0.05 part, and the addition amount of the oxidant is 0.01-0.05 part;
preferably, the azo initiator is one or a mixture of azobisisobutyramidine dihydrochloride, azobisisoheptonitrile and azobisisobutyrimidazoline hydrochloride, and the oxidant is potassium persulfate or ammonium persulfate.
Further, the reducing agent is sodium bisulfite.
Preferably, the sodium bisulfate is added in a plurality of times in the reaction process, and the specific adding method comprises the following steps: adding 10% sodium bisulfite into the mixture 20min after the reaction starts to initiate polymerization reaction; and adding 30% of sodium bisulfite after reacting for 1.5h, continuously reacting for 2h, adding 30% of sodium bisulfite, reacting for 2h until the reaction is finished, and adding the rest of sodium bisulfite until the polymerization reaction is finished.
A high-efficiency salt-resistant dual-purpose thickening agent is prepared by the preparation method.
The invention also discloses the application of the high-efficiency salt-resistant one-agent dual-purpose thickening agent, the high-efficiency salt-resistant one-agent dual-purpose thickening agent can be used as a fracturing fluid slickwater drag reducer and a fracturing fluid thickening agent, and when the high-efficiency salt-resistant one-agent dual-purpose thickening agent is used as a drag reducer, the adding concentration is 0.05-0.1%; when the thickening agent is used, the adding concentration is 0.6-1%.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
1. according to the efficient salt-resistant dual-purpose thickening agent, the hydrophobic monomer, the functional monomer and the salt-resistant monomer are introduced into the efficient salt-resistant dual-purpose thickening agent, a spatial network structure with a compact and complex structure is formed in an aqueous solution, the thermal stability and the salt resistance of the thickening agent are improved, and the aqueous solution can keep high viscosity under the condition of high salinity. Meanwhile, the addition of the chain extender enables the molecular chain of the polymer to be longer and the viscosity to be greatly improved. The introduction of the cosolvent can further improve the dissolution speed of the polymer emulsion, can be completely dissolved within 30 seconds, has low requirement on water quality, and can be prepared from oilfield reinjection water and oilfield wastewater. The addition of the suspending agent ensures that an emulsion system is more stable, and the emulsion can not be layered within 2 years.
2. The efficient salt-resistant one-agent dual-purpose thickening agent provided by the invention has the advantages of quick dissolution, small addition amount, high drag reduction rate, strong salt resistance, good sand suspending effect, low viscosity after gel breaking, complete flowback, less residue and the like, and is an environment-friendly efficient comb-type thickening agent.
3. The efficient salt-resistant one-agent dual-purpose thickening agent prepared by adopting the inverse emulsion polymerization process has the characteristic of one-agent dual-purpose, can be used as a fracturing fluid slick water drag reducer and a fracturing fluid thickening agent: when the material is used as a drag reducer, the addition amount is 0.05 percent, and the drag reduction rate of the system can reach 78 percent; when the sand suspending agent is used as a thickening agent, the addition amount is 1 percent, the six-speed viscosity of tap water can reach 120mpa & s, and the sand suspending effect is good.
4. The preparation method provided by the invention has the advantages that various raw materials related to the preparation method can be purchased from the market, the operation of each step is simple, the requirement on reaction conditions is not high, the cost of the product can be effectively reduced, and the preparation method is suitable for industrial production.
The above description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clear and clear, and to implement the technical means according to the content of the description, the following description is made of the preferred embodiments of the present invention.
Drawings
FIG. 1 is a curve for testing the drag reduction performance of the efficient salt-resistant one-agent dual-purpose thickener of the invention;
FIG. 2 is a test curve of the rheological property of the high-efficiency salt-resistant one-agent dual-purpose thickener.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be noted that the implementation conditions used in the examples can be further adjusted according to the specific experimental environment, and the implementation conditions not mentioned are generally the conditions in the routine experiments. The preparation methods mentioned in the invention are all conventional methods unless specified otherwise; all starting materials mentioned in the following examples are obtained from published commercial sources unless otherwise specified.
The invention firstly discloses a preparation method of a high-efficiency salt-resistant one-agent dual-purpose thickening agent, which comprises the following steps:
s1, preparing a water phase: uniformly mixing 160 parts by weight of 120-plus-one acrylamide, 60-80 parts by weight of acrylic acid, 80-120 parts by weight of 2-acrylamido-2-methylpropanesulfonic acid, 5-10 parts by weight of functional monomer, 1-4 parts by weight of hydrophobic monomer, 3-6 parts by weight of chain extender, 2-5 parts by weight of cosolvent and 340 parts by weight of water, adjusting the pH value to 6.5-6.7 by using a pH regulator, and uniformly mixing to obtain a water phase;
s2, preparing an oil phase: uniformly mixing 240 parts of white oil 200-one, 20-35 parts of main emulsifier, 4-7 parts of auxiliary emulsifier and 3-6 parts of suspending agent by weight to obtain an oil phase;
s3, emulsification: sequentially adding a water phase, an oil phase and an initiator into a mixing kettle, controlling the rotating speed at 500rpm/min in the adding process, stirring for 1.5-2.5 h at room temperature, and cooling to 15-25 ℃ to obtain an emulsion;
s4, polymerization: introducing nitrogen into the emulsion obtained in the S3 to remove oxygen, controlling the temperature at 45-50 ℃, and adding a reducing agent to initiate polymerization; the stirring speed is always kept at 150rpm/min during the polymerization reaction,
s5, post-processing: and after the polymerization reaction is finished, adding 23-33 parts of fatty alcohol-polyoxyethylene ether, and uniformly stirring to obtain light yellow semitransparent liquid, namely the high-efficiency salt-resistant one-agent dual-purpose thickening agent.
Further, the functional monomer is prepared from a grafting monomer and dimethylaminoethyl methacrylate according to the molar ratio of 1: 1; wherein the grafting monomer is one or a mixture of two or more than two of N-tertiary butyl-2-methylbenzamide, 2- (chloromethyl) benzoyl chloride and 2-methylbenzamide in any proportion.
Specifically, the preparation method of the functional monomer comprises the following steps: uniformly mixing dimethylaminoethyl methacrylate and solvent water according to a ratio, introducing nitrogen to remove oxygen, heating to 50 ℃ under the stirring condition of the rotating speed of 100rpm/min, continuously introducing nitrogen to protect, beginning to dropwise add the grafting monomer at the water bath temperature of 50-70 ℃, controlling the dropwise adding time within 2 hours, and obtaining the functional monomer after the reaction is finished;
wherein the dosage of the solvent water is 20 percent of the total mass of the functional monomer.
Preferably, the hydrophobic monomer is one or a mixture of two or more of N-tert-butyl acrylamide, methyl methacrylate, styrene, N-dodecyl acrylamide and octadecyl dimethyl allyl ammonium chloride in any proportion.
Preferably, the chain extender is one or a mixture of two or more of polyethylene glycol diacrylate, polyethylene glycol dimethacrylate, polypropylene glycol diacrylate, polypropylene glycol dimethacrylate and polyglycerol acrylate in any proportion.
Preferably, the cosolvent is one of fatty alcohol polyoxyethylene ether AEO-15 and isomeric tridecanol polyoxyethylene ether 1310 or a mixture of the isomeric tridecanol polyoxyethylene ether 1310 in any proportion.
Preferably, the main emulsifier is a composite emulsifier system and is prepared from Tween 80 and Span65 according to the mass ratio of 1: 5.
Preferably, the coemulsifier is n-octanol and ethylene glycol in a ratio of 7: 3 in a mass ratio.
Preferably, the suspending agent is one of hydrophobic silica, modified hectorite or a mixture thereof.
Preferably, the initiator is a composite initiation system and comprises an azo initiator and an oxidant, wherein the addition amount of the azo initiator is 0.01-0.05 part, and the addition amount of the oxidant is 0.01-0.05 part;
preferably, the azo initiator is one or a mixture of azobisisobutyramidine dihydrochloride, azobisisoheptonitrile and azobisisobutyrimidazoline hydrochloride, and the oxidant is potassium persulfate or ammonium persulfate.
Further, the reducing agent is sodium bisulfite.
Preferably, the sodium bisulfate is added in a plurality of times in the reaction process, and the specific adding method comprises the following steps: adding 10% sodium bisulfite into the mixture 20min after the reaction starts to initiate polymerization reaction; and adding 30% of sodium bisulfite after reacting for 1.5h, continuously reacting for 2h, adding 30% of sodium bisulfite, reacting for 2h until the reaction is finished, and adding the rest of sodium bisulfite until the polymerization reaction is finished.
The invention also provides a high-efficiency salt-resistant dual-purpose thickening agent, which is prepared by the preparation method.
The invention also discloses the application of the high-efficiency salt-resistant one-agent dual-purpose thickening agent, the high-efficiency salt-resistant one-agent dual-purpose thickening agent can be used as a fracturing fluid slickwater drag reducer and a fracturing fluid thickening agent, and when the high-efficiency salt-resistant one-agent dual-purpose thickening agent is used as a drag reducer, the adding concentration is 0.05-0.1%; when the thickening agent is used, the adding concentration is 0.6-1%.
The following tests were carried out on the highly effective salt-resistant one-agent dual-purpose thickener prepared in the following examples in the following manner:
(1) viscosity measurement
Preparing the obtained high-efficiency salt-resistant dual-purpose thickening agent into a thickening agent solution with a certain concentration: adding a certain amount of polymer emulsion into the required saline water, stirring for 5 minutes under the condition of a vertical stirrer at 1000r/min, and using a six-speed viscometer at the temperature of 25 ℃ and the shear rate of 170s-1The viscosity of the polymer solution was measured.
The apparent viscosity is calculated according to equation (1):
in the formula: eta-apparent viscosity, mpa.s
k-six times the reading of the rotational viscometer.
(2) Measurement of rheological Properties
A concentrated polymer solution was prepared and tested for rheological properties using a model HAAKE MARS 40 rheometer for drag reducing agent solutions. Wherein the shear rate is controlled at 170s during the performance evaluation experiment-1The shearing time is 60min, and the temperature is controlled at 90 ℃.
(3) Testing of suspended Sand Performance
Preparing a 1% polymer solution by using tap water, adding 20-40% ceramsite sand into a glass cup according to a sand ratio of 35%, uniformly stirring, pouring into a 100ml graduated cylinder, observing and recording the sand settling rate (the percentage of settled height of the ceramsite sand to the total height of the sand carrying liquid). And observing and recording the suspension state and the sand setting rate of the sand grains within 24 hours.
(4) Testing of drag reduction Performance
Determination of drag reduction ratio: the slickwater was prepared as required and was performed according to the method of 7.8 in NB/T14003.1-2015, the experimental method was as follows:
and adopting an indoor pipeline friction resistance instrument to perform resistance reduction performance test. The inside diameter of the pipe is 8mm, the test length of the horizontal pipe is 2.5m, the pressure difference of the fluid passing through the pipe is recorded, and the drag reduction rate is calculated as shown in the following formula. The drag reducing efficiency of the drag reducer under turbulent conditions was tested.
In the formula: DR is the drag reduction,%; delta P1 is the pressure difference, Pa, between the two ends of the loop when the loop is clean; Δ P2 is the pressure difference between the two ends, Pa, when the mobile phase is slickwater.
Example 1:
the invention provides a high-efficiency salt-resistant one-agent dual-purpose thickening agent, which comprises the following components in parts by weight: 120 parts of acrylamide, 60 parts of acrylic acid, 80 parts of 2-acrylamide-2-methylpropanesulfonic acid, 5 parts of functional monomer, 1 part of N-tert-butyl acrylamide, 3 parts of polyethylene glycol diacrylate, 152 parts of fatty alcohol polyoxyethylene ether AEO-152, 48 parts of sodium hydroxide, 340 parts of water, 200 parts of white oil, 20 parts of main emulsifier, 4 parts of co-emulsifier, 3 parts of hydrophobic silica, 0.03 part of azobisisobutyrimidazoline hydrochloride, 0.02 part of potassium persulfate and 0.02 part of sodium bisulfite.
The preparation method comprises the following steps: s1, preparing a water phase; s2, preparing an oil phase; s3, emulsification and polymerization: fully and uniformly mixing the water phase, the oil phase and the initiator, emulsifying for 2h, cooling to 20 ℃, transferring into a reaction kettle, introducing nitrogen to remove oxygen for 30min, and pumping sodium bisulfite to initiate polymerization; s4, post-processing: and (3) adding 26 parts by weight of fatty alcohol-polyoxyethylene ether after the polymerization reaction is finished, and uniformly stirring to obtain the light yellow semitransparent emulsion.
The apparent viscosity of the synthesized efficient thickener is 1420mpa & s, and the drag reduction performance is as follows: 0.05% drag reduction 76.46% (test water: mineralized water 50000ppm, containing 3000ppm calcium and magnesium ions); thickening performance: 1% tap water with a viscosity of 120 mpa.s, 2% 8.5 ten thousand mineralized water with a viscosity of 60 mpa.s; rheological properties: viscosity 82mpa · s after shearing at 90 ℃ for 60 minutes; sand suspension performance: the 24h sedimentation rate is 0.5% (1% tap water solution, sand ratio is 35%. drag reduction curve, rheological curve are shown in figure 1, figure 2.
Example 2
The invention provides a high-efficiency salt-resistant one-agent dual-purpose thickening agent, which comprises the following components: 140 parts of acrylamide, 70 parts of acrylic acid, 100 parts of 2-acrylamide-2-methylpropanesulfonic acid, 7 parts of functional monomer, 2 parts of N-dodecyl acrylamide, 5 parts of polyethylene glycol dimethacrylate, 13104 parts of isotridecanol polyoxyethylene ether, 58 parts of sodium hydroxide, 310 parts of water, 220 parts of white oil, 27 parts of main emulsifier, 5 parts of co-emulsifier, 5 parts of modified hectorite, 0.03 part of azobisisobutyrimidazoline hydrochloride, 0.02 part of potassium persulfate and 0.02 part of sodium bisulfite.
The preparation method comprises the following steps: s1, preparing a water phase; s2, preparing an oil phase; s3, emulsification and polymerization: fully and uniformly mixing the water phase, the oil phase and the initiator, emulsifying for 2h, cooling to 20 ℃, transferring into a reaction kettle, introducing nitrogen to remove oxygen for 30min, and pumping sodium bisulfite to initiate polymerization; s4, post-processing: and adding 27 parts by weight of fatty alcohol-polyoxyethylene ether after the polymerization reaction is finished, and uniformly stirring to obtain the light yellow semitransparent emulsion.
The apparent viscosity of the synthesized efficient thickener is 1270mpa & s, and the drag reduction performance is as follows: 0.05% drag reduction 75.15% (test water: mineralized water 50000ppm, which contains 3000ppm calcium and magnesium ions); thickening performance: 1% tap water viscosity 105 mpa.s, 2% 8.5 ten thousand mineralized water viscosity 66 mpa.s; rheological properties: viscosity 91mpa · s after shearing at 90 ℃ for 60 minutes; sand suspension performance: the sedimentation rate after 24 hours is 0.5% (1% tap water solution, sand ratio is 35%). The drag reduction curve and the rheological curve are shown in fig. 1 and fig. 2.
Example 3
The invention provides a high-efficiency salt-resistant one-agent dual-purpose thickening agent, which comprises the following components in parts by weight: 160 parts of acrylamide, 80 parts of acrylic acid, 120 parts of 2-acrylamide-2-methylpropanesulfonic acid, 10 parts of functional monomer, 4 parts of octadecyl dimethyl allyl ammonium chloride, 6 parts of polyethylene glycol dimethacrylate, 13105 parts of isomeric tridecanol polyoxyethylene ether, 67 parts of sodium hydroxide, 280 parts of water, 240 parts of white oil, 35 parts of main emulsifier, 7 parts of co-emulsifier, 6 parts of hydrophobic silica, 0.03 part of azodiisobutyl imidazoline hydrochloride, 0.02 part of potassium persulfate and 0.02 part of sodium bisulfite.
The preparation method comprises the following steps: s1, preparing a water phase; s2, preparing an oil phase; s3, emulsification and polymerization: fully and uniformly mixing the water phase, the oil phase and the initiator, emulsifying for 2 hours, cooling to 20 ℃, transferring into a reaction kettle, introducing nitrogen to remove oxygen for 30min, pumping sodium bisulfite to initiate polymerization, and S4. carrying out aftertreatment: and after the polymerization reaction is finished, 31 parts by weight of fatty alcohol-polyoxyethylene ether is added, and the mixture is uniformly stirred to obtain light yellow semitransparent emulsion.
The apparent viscosity of the synthesized high-efficiency thickening agent is 1350mpa & s, and the drag reduction performance is as follows: 0.05% drag reduction 76.77% (test water: mineralized water 50000ppm, containing 3000ppm calcium and magnesium ions); thickening performance: 1% tap water viscosity 132 mpa.s, 2% 8.5 ten thousand mineralized water viscosity 75 mpa.s; rheological properties: viscosity 112mpa · s after shearing at 90 ℃ for 60 minutes; sand suspension performance: the sedimentation rate after 24 hours is 0.5% (1% tap water solution, sand ratio is 35%). The drag reduction curve and the rheological curve are shown in fig. 1 and fig. 2.
According to the efficient salt-resistant dual-purpose thickening agent, the hydrophobic monomer, the functional monomer and the salt-resistant monomer are introduced into the efficient salt-resistant dual-purpose thickening agent, a spatial network structure with a compact and complex structure is formed in an aqueous solution, the thermal stability and the salt resistance of the thickening agent are improved, and the aqueous solution can keep high viscosity under the condition of high salinity. Meanwhile, the addition of the chain extender enables the molecular chain of the polymer to be longer and the viscosity to be greatly improved. The introduction of the cosolvent can further improve the dissolution speed of the polymer emulsion, can be completely dissolved within 30 seconds, has low requirement on water quality, and can be prepared from oilfield reinjection water and oilfield wastewater. The addition of the suspending agent ensures that an emulsion system is more stable, and the emulsion can not be layered within 2 years.
The thickening agent obtained by the invention has the characteristic of dual purposes, can be used as a slick water drag reducer of fracturing fluid and can also be used as a thickening agent of the fracturing fluid: when the compound is used as a drag reducer, the preferable addition amount is 0.05 percent, and the drag reduction rate of the system can reach 78 percent; when the sand suspending agent is used as a thickening agent, the preferable addition amount is 1%, the six-speed viscosity of tap water can reach 120mpa & s, and the sand suspending effect is good.
In conclusion, the efficient salt-resistant one-agent dual-purpose thickening agent has the advantages of quick dissolution, small addition, high resistance reduction rate, strong salt resistance, good sand suspending effect, low viscosity after gel breaking, complete flowback, less residue and the like, and is an environment-friendly efficient comb-type thickening agent. Not only can improve the overall development economic benefit of the oil field and is remarkable, but also has better field popularization value.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that the present invention is not limited to the details of the embodiments shown and described, but is capable of numerous equivalents and substitutions without departing from the spirit of the invention as set forth in the claims appended hereto.
Claims (10)
1. The preparation method of the efficient salt-resistant one-agent dual-purpose thickening agent is characterized by comprising the following steps of:
s1, preparing a water phase: uniformly mixing 160 parts by weight of 120-plus-one acrylamide, 60-80 parts by weight of acrylic acid, 80-120 parts by weight of 2-acrylamido-2-methylpropanesulfonic acid, 5-10 parts by weight of functional monomer, 1-4 parts by weight of hydrophobic monomer, 3-6 parts by weight of chain extender, 2-5 parts by weight of cosolvent and 340 parts by weight of water, adjusting the pH value to 6.5-6.7 by using a pH regulator, and uniformly mixing to obtain a water phase;
s2, preparing an oil phase: uniformly mixing 240 parts of white oil 200-one, 20-35 parts of main emulsifier, 4-7 parts of auxiliary emulsifier and 3-6 parts of suspending agent by weight to obtain an oil phase;
s3, emulsification: sequentially adding a water phase, an oil phase and an initiator into a mixing kettle, controlling the rotating speed at 500rpm/min in the adding process, stirring for 1.5-2.5 h at room temperature, and cooling to 15-25 ℃ to obtain an emulsion;
s4, polymerization: introducing nitrogen into the emulsion obtained in the S3 to remove oxygen, controlling the temperature at 45-50 ℃, and adding a reducing agent to initiate polymerization; the stirring speed is always kept at 150rpm/min in the polymerization reaction process;
s5, post-processing: and after the polymerization reaction is finished, adding 23-33 parts of fatty alcohol-polyoxyethylene ether, and uniformly stirring to obtain light yellow semitransparent liquid, namely the high-efficiency salt-resistant one-agent dual-purpose thickening agent.
2. The preparation method of the high-efficiency salt-resistant one-dose dual-purpose thickening agent according to claim 1, which is characterized in that: the functional monomer is prepared from a grafting monomer and dimethylaminoethyl methacrylate according to the molar ratio of 1: 1; wherein the grafting monomer is one or a mixture of two or more than two of N-tertiary butyl-2-methylbenzamide, 2- (chloromethyl) benzoyl chloride and 2-methylbenzamide in any proportion.
3. The preparation method of the efficient salt-resistant one-dose dual-purpose thickening agent according to claim 2, wherein the preparation method of the functional monomer comprises the following steps: uniformly mixing dimethylaminoethyl methacrylate and solvent water according to a ratio, introducing nitrogen to remove oxygen, heating to 50 ℃ under the stirring condition of the rotating speed of 100rpm/min, continuously introducing nitrogen to protect, beginning to dropwise add the grafting monomer at the water bath temperature of 50-70 ℃, controlling the dropwise adding time within 2 hours, and obtaining the functional monomer after the reaction is finished;
wherein the dosage of the solvent water is 20 percent of the total mass of the functional monomer.
4. The preparation method of the high-efficiency salt-resistant one-dose dual-purpose thickening agent according to claim 1, which is characterized in that: the hydrophobic monomer is one or a mixture of two or more of N-tert-butyl acrylamide, methyl methacrylate, styrene, N-dodecyl acrylamide and octadecyl dimethyl allyl ammonium chloride in any proportion.
5. The preparation method of the high-efficiency salt-resistant one-dose dual-purpose thickening agent according to claim 1, which is characterized in that: the chain extender is one or a mixture of two or more of polyethylene glycol diacrylate, polyethylene glycol dimethacrylate, polypropylene glycol diacrylate, polypropylene glycol dimethacrylate and polyglycerol acrylate in any proportion;
the cosolvent is one of fatty alcohol polyoxyethylene ether AEO-15 and isomeric tridecanol polyoxyethylene ether 1310 or a mixture of the isomeric tridecanol polyoxyethylene ether 1310 in any proportion.
6. The preparation method of the high-efficiency salt-resistant one-dose dual-purpose thickening agent according to claim 1, which is characterized in that: the main emulsifier is a composite emulsifier system and is prepared from Tween 80 and Span65 according to the mass ratio of 1: 5;
the coemulsifier is composed of n-octanol and glycol according to the ratio of 7: 3, the mass ratio is prepared;
the suspending agent is one or a mixture of hydrophobic silicon dioxide and modified hectorite.
7. The preparation method of the high-efficiency salt-resistant one-dose dual-purpose thickening agent according to claim 1, which is characterized in that: the initiator is a composite initiation system and comprises an azo initiator and an oxidant, wherein the addition amount of the azo initiator is 0.01-0.05 part, and the addition amount of the oxidant is 0.01-0.05 part;
the azo initiator is one or a mixture of azobisisobutyramidine dihydrochloride, azobisisoheptonitrile and azobisisobutyrimidazoline hydrochloride, and the oxidant is potassium persulfate or ammonium persulfate.
8. The preparation method of the high-efficiency salt-resistant one-dose dual-purpose thickening agent according to claim 1, which is characterized in that: the reducing agent is sodium bisulfite, and the sodium bisulfate is added for multiple times in the reaction process, and specifically comprises the following steps: adding 10% sodium bisulfite into the mixture 20min after the reaction starts to initiate polymerization reaction; and adding 30% of sodium bisulfite after reacting for 1.5h, continuously reacting for 2h, adding 30% of sodium bisulfite, reacting for 2h until the reaction is finished, and adding the rest of sodium bisulfite until the polymerization reaction is finished.
9. A highly effective salt-resistant one-agent dual-purpose thickener obtained by the production method according to any one of claims 1 to 8.
10. The application of the efficient salt-resistant one-agent dual-purpose thickening agent is characterized in that: the efficient salt-resistant one-agent dual-purpose thickening agent can be used as a fracturing fluid slickwater drag reducer and a fracturing fluid thickening agent, and when the efficient salt-resistant one-agent dual-purpose thickening agent is used as the drag reducer, the adding concentration is 0.05% -0.1%; when the thickening agent is used, the adding concentration is 0.6-1%.
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