CN114605680A - Preparation method of high-drag-reduction high-salt-resistance degradable polyacrylamide drag reducer - Google Patents

Preparation method of high-drag-reduction high-salt-resistance degradable polyacrylamide drag reducer Download PDF

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CN114605680A
CN114605680A CN202210368425.2A CN202210368425A CN114605680A CN 114605680 A CN114605680 A CN 114605680A CN 202210368425 A CN202210368425 A CN 202210368425A CN 114605680 A CN114605680 A CN 114605680A
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drag
sodium
drag reducer
glycidyl methacrylate
styrenesulfonate
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CN114605680B (en
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王洪志
邹鹏
张效洁
吉海峰
杨志鹏
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Hebei University of Technology
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Abstract

The invention relates to a preparation method of a degradable polyacrylamide drag reducer with high drag reduction and high salt resistance. The method comprises the steps of inducing sodium p-styrene sulfonate to catalyze the ring opening of glycidyl methacrylate to obtain 2, 3-dihydroxypropyl methacrylate, and continuously utilizing the incompletely reacted sodium p-styrene sulfonate and the obtained 2, 3-dihydroxypropyl methacrylate to carry out the next reaction under the action of acrylamide, an initiator and a cross-linking agent to obtain the required polymer drag reducer. In the present invention, the drag reducer obtained has good salt resistance because of the sulfonic acid group of sodium p-styrenesulfonate. In the process, the sodium p-styrene sulfonate plays an important role, and not only serves as a catalyst for primary reaction, but also is one of synthetic raw materials of final polymerization products.

Description

Preparation method of high-drag-reduction high-salt-resistance degradable polyacrylamide drag reducer
The technical field is as follows:
the invention belongs to the field of drag reducer slickwater. In particular to a preparation method of a degradable polyacrylamide drag reducer with high drag reduction and high salt resistance.
Background art:
in the shale gas exploitation process, due to the poor physical properties of a reservoir, the fracturing volume of the reservoir is required to be modified during construction, so that a crack is generated to guide flow, and further, slickwater can be used for improving the recovery efficiency. The slickwater has many excellent characteristics, such as lower viscosity, easy flowback, lower damage to a reservoir stratum, low price and low cost, and the like. In the construction process, the residues are less after the use, and the amount of some residual gel is less. Among the constituents of slickwater, the most important one is an acrylamide polymer drag reducer (applied chemical, 2020,49(05), 1138-1142). The slickwater fracturing fluid is different from the traditional fracturing fluid, the traditional fracturing fluid has higher viscosity and is easier to form gel, and the concentration of a polymer in the slickwater fracturing fluid is lower. In the process of preparing the slickwater fracturing fluid, the main component of the slickwater fracturing fluid is water, and under the condition of high-speed pumping, for water of Newtonian fluid, a certain large frictional resistance is generated between the fluid and a pipe wall, the phenomenon of turbulent flow of the fracturing fluid in a pipeline occurs, the flowing of the slickwater fracturing fluid in the pipeline is hindered, the conveying amount of the pipeline is reduced, the conveying efficiency is reduced, and the energy consumption of equipment is further increased. The drag reducer is a chemical assistant which can reduce the frictional resistance between fluids and between the fluids and pipelines, and a small amount of high polymer drag reducer is added into the fracturing fluid, so that the flow resistance can be rapidly reduced under the condition of disorder, the energy consumption is reduced, and the conveying efficiency is improved (petrochemical industry, 2015,44(05), 607-611). Drag reducing agents come in different types, such as high temperature resistant, salt resistant, and the like. For this type of drag reducer, some of the more common methods are to introduce temperature-resistant and salt-resistant monomers during the polymerization of acrylamide, and these monomers are characterized by containing strong electrolyte groups or cyclic structure groups. For example, sulfonate groups are believed to form stronger hydrogen bonds with water, and thus may improve the stability of the copolymer in solution. In addition, the sulfonate is better in hydrophilicity, and can increase the water solubility of the polymer. In addition, the introduction of sulfonic acid groups can also greatly improve the temperature resistance and salt tolerance of the copolymer, which has important significance for the copolymer drag reducer (application chemical engineering, 2019,48(01), 113-.
The slickwater system can reduce the load of fracturing construction equipment, effectively increase the construction net pressure, greatly reduce the frictional resistance and the construction pressure in the construction process, effectively improve the fracturing transformation effect, reduce the construction energy consumption and improve the construction efficiency. At present, the slickwater fracturing technology plays an important role in shale gas exploitation processes at home and abroad, and becomes a main yield increasing technology in the exploitation process, and slickwater becomes one of the most commonly used liquids in shale reservoir fracturing modification (oil drilling technology, 2015,43(01), 27-32).
The invention content is as follows:
the invention aims to provide a preparation method of a degradable polyacrylamide drag reducer with high drag reduction and high salt resistance aiming at the defects of the current slickwater fracturing fluid system. The method comprises the steps of inducing sodium p-styrene sulfonate to catalyze the ring opening of glycidyl methacrylate to obtain 2, 3-dihydroxypropyl methacrylate, and continuously utilizing the incompletely reacted sodium p-styrene sulfonate and the obtained 2, 3-dihydroxypropyl methacrylate to carry out the next reaction under the action of acrylamide, an initiator and a cross-linking agent to obtain the required polymer drag reducer. In addition, because of the sulfonic acid group of sodium p-styrenesulfonate, the drag reducer obtained has good salt resistance. In the process, the sodium p-styrene sulfonate plays an important role, and not only serves as a catalyst for primary reaction, but also is one of synthetic raw materials of final polymerization products.
The technical scheme of the invention is as follows:
a preparation method of a degradable polyacrylamide drag reducer with high drag reduction and high salt resistance is one of the following two methods:
the method I comprises the following steps: adding a solution containing glycidyl methacrylate and sodium p-styrenesulfonate into a reactor under the nitrogen atmosphere and magnetic stirring, reacting for 4-12 h at 40-100 ℃, then adding an acrylamide solution, adding a compound initiator and a cross-linking agent borax, reacting for 4-6 h to obtain a milky gel, and freeze-drying and crushing to obtain the high-drag-reduction high-salt-resistance degradable polyacrylamide drag reducer;
wherein, the molar ratio is that glycidyl methacrylate: sodium p-styrenesulfonate: (1-10): (1-10): (1-10), wherein the mass of the borax is 1-10% of the total mass of all materials in the first method;
adding 0.01-0.1 mol of glycidyl methacrylate into 10-50 ml of water in a solution containing glycidyl methacrylate and sodium p-styrenesulfonate; the concentration of the acrylamide solution is 0.001-0.1 mol/ml; adding 0.1-1 mmol of compound initiator into every 10ml of acrylamide solution (wherein the mol number of the compound initiator is the sum of the mol numbers of the two compound substances); the compound initiator comprises ammonium persulfate and sodium bisulfite, and the molar ratio of the ammonium persulfate to the sodium bisulfite is as follows: sodium bisulfite (0.1 to 1): (0.1 to 1);
the second method comprises the following steps: adding white oil and an emulsifier into a reactor, and emulsifying for 30-60 min under stirring in a nitrogen atmosphere to obtain an oil phase; then adding the water phase into the oil phase, and reacting for 4-12 h at 40-100 ℃; then adding an acrylamide solution, and finally adding a compound initiator and a cross-linking agent borax for reacting for 4-6 h to obtain the degradable polyacrylamide drag reducer with high drag reduction and high salt resistance;
wherein the water phase is an aqueous solution containing glycidyl methacrylate and sodium p-styrene sulfonate, and 0.01-0.1 mol of glycidyl methacrylate and 0.01-0.1 mol of sodium p-styrene sulfonate are added into every 10-50 ml of deionized water; the molar ratio is, glycidyl methacrylate: sodium p-styrenesulfonate: (1-10): (1-10): (1-10);
the concentration range of the acrylamide solution is 0.001-0.1 mol/ml; adding 0.1-1 mmol of compound initiator into every 10ml of acrylamide solution; the compound initiator comprises ammonium persulfate and sodium bisulfite, and the molar ratio of the ammonium persulfate to the sodium bisulfite is as follows: sodium bisulfite (0.1 to 1): (0.1 to 1); the mass of the cross-linking agent borax is 1-10% of the total mass of all the materials in the second method;
adding 3-10 g of emulsifier into every 20g of white oil, wherein the emulsifier is span 80 and tween 80, and the mass ratio is (10-20): 1, the volume ratio of the water phase to the oil phase is 1: 0.5 to 1.5.
The invention has the substantive characteristics that:
aiming at the technical problem of a slickwater fracturing fluid system, sodium p-styrene sulfonate containing sulfonic acid groups and 2, 3-dihydroxypropyl methacrylate containing hydroxyl are reacted with acrylamide, and a novel degradable polyacrylamide drag reducer with high drag reduction and high salt resistance is generated under the action of a compound initiator and a cross-linking agent borax. The polymer drag reducer is added into a large amount of water, and then a plurality of propping agents and a small amount of surfactant, clay stabilizer, cleanup additive, anti-swelling agent, gel breaker, bactericide and the like are added to prepare slickwater, so that the slickwater can be well applied to the petrochemical industry. After the drag reducer is added into an oil product, the radial motion of oil product molecules can be limited, and the oil product molecules can flow along the direction of the pipeline, so that the disordered motion condition of the oil product molecules can be effectively reduced, and the frictional resistance between the oil product molecules and the pipeline is reduced. According to the principle of fluid mechanics, the more pronounced the tendency of laminar flow and the lower the coefficient of friction drag, drag reducers are the means by which the reduction of drag and increase of throughput is achieved.
The invention has the beneficial effects that:
the beneficial result of the invention is that the obtained polyacrylamide drag reducer has good drag reduction performance, salt resistance and degradability. In the preparation process, the sodium styrene sulfonate plays an important role. The catalyst not only serves as a catalyst for primary reaction, but also serves as one of synthetic raw materials of a final product, and a secondary adding step is omitted. Meanwhile, the contained sulfonic acid group is also a source of the salt resistance of the polymer drag reducer. And (2) carrying out copolymerization reaction on sodium p-styrene sulfonate, 2, 3-dihydroxy propyl methacrylate obtained by inducing and catalyzing glycidyl methacrylate to open a ring, acrylamide, an initiator and a crosslinking agent to obtain the polyacrylamide drag reducer. The polyacrylamide drag reducer was characterized with respect to degradability and drag reduction, and the following results were obtained. In the aspect of degradability, as can be seen by an electron microscope, the commercialized drag reducer is not completely degraded, and a cross-linking phenomenon occurs, so that shale cracks can be blocked in industrial application, and construction operation is influenced. The polyacrylamide drag reducer can be seen through an electron microscope, and after the polyacrylamide drag reducer is used, the polyacrylamide drag reducer is degraded and broken, and no crosslinking phenomenon occurs. In the construction operation, the liquid can be smoothly discharged along with the flow-back liquid, so that the construction operation is convenient, and the figure 1 is shown. In terms of drag reduction, the drag reduction rate of a commercial drag reducer is 53% at a line speed of 3m/s, and the drag reduction rate of process one is 61% and the drag reduction rate of process two is 64% at a line speed of 3m/s, see fig. 2. Also, the drag reducer has an average drag reduction rate of about 8% higher than commercial drag reducers at different line speeds. Because the drag reducer has good degradation performance, the drag reducer has low damage to shale cores, is not easy to block shale cracks, and can be well applied to the petrochemical industry. In addition, after the drag reducer slickwater is added into a pipeline for conveying petroleum, the disorder condition of the oil product in the pipeline can be inhibited, the friction between the oil product and the pipe wall is reduced, the pressure of the pipeline is relieved, and the safety of the operation of the pipeline is further ensured. Meanwhile, the capacity of long-distance pipeline transportation is improved, the energy consumption of the system is reduced, and the transportation efficiency is further improved.
Drawings
FIG. 1 is an electron micrograph of various drag reducing agents with respect to degradation performance;
FIG. 2 is a test chart of various drag reducing agents with respect to drag reduction;
FIG. 3 is an infrared spectrum of the copolymer drag reducer obtained in example 1;
FIG. 4 is an infrared spectrum of the copolymer drag reducer obtained in example 2;
FIG. 5 is a nuclear magnetic hydrogen spectrum of the copolymer drag reducer obtained in example 1;
FIG. 6 is a nuclear magnetic hydrogen spectrum of the copolymer drag reducer obtained in example 2.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Figure BDA0003581506730000031
Method one the first reaction mechanism step is shown in equation 1: and (3) reacting glycidyl methacrylate for 6 hours at 75 ℃ under the condition of introducing nitrogen and removing oxygen, promoting the ring opening of the glycidyl methacrylate by the induction action of sodium styrene sulfonate, and carrying out the next reaction by using the ring opening product.
Figure BDA0003581506730000041
Method one the reaction mechanism is shown in the second step in equation 2: the copolymer drag reducer is obtained after reaction of glycidyl methacrylate under the catalytic induction action of sodium styrene sulfonate and acrylamide under the conditions of nitrogen introduction and oxygen removal, 75 ℃ and 10 hours of total reaction through the action of ammonium sulfate, sodium bisulfite compound initiator and borax cross-linking agent. Wherein, the reaction mechanism of the second method is also the same.
The high-drag-reduction high-salt-resistance degradable polyacrylamide drag reducer is applied to the field of petrochemical industry, and the polymer drag reducer is added into a large amount of water, and then a plurality of propping agents and a small amount of surfactants, clay stabilizers, cleanup additives, anti-swelling agents, gel breakers, bactericides and the like are added to prepare slickwater. At the same time, the degradation of the drag reducer can be examined. Examples 1 and 2 are two methods of preparing copolymer drag reducing agents.
Example 1
The preparation and application of the degradable polyacrylamide drag reducer with high drag reduction and high salt resistance are characterized by comprising the following steps:
synthesizing a degradable polyacrylamide drag reducer by an aqueous solution polymerization method: a magneton is put into a reaction tube, nitrogen is introduced to remove oxygen in the tube, 1.42g (0.01mol) of glycidyl methacrylate and 3.09g (0.015mol) of sodium p-styrene sulfonate are added into 15ml of deionized water, dissolved and then added into the reaction tube by using an injector to react for 6h at 75 ℃. 7.1g (0.1mol) of acrylamide was dissolved in 10ml of deionized water, and after dissolution, it was added to the reaction tube by means of a syringe. 0.036g (0.158mmol) of ammonium persulfate, 0.036g (0.346mmol) of sodium bisulfite initiator and finally 0.4g (1.05mmol) of sodium tetraborate decahydrate were added. Adjusting a heat collection type constant temperature magnetic stirrer to 500r/min, reacting for 4h to obtain milk white gel, and freeze-drying and crushing the milk white gel to obtain the milk white gel.
Example 2
The preparation and application of the degradable polyacrylamide drag reducer with high drag reduction and high salt resistance are characterized by comprising the following steps:
synthesizing a degradable polyacrylamide drag reducer by an inverse emulsion polymerization method: firstly preparing an oil phase, weighing 20g of white oil, 2.76g of span 80 and 0.24g of Tween 80 emulsifier, adding into a reaction tube, adding magnetons, introducing nitrogen to remove oxygen, and fully emulsifying for 30min under the condition of uniformly stirring, wherein the volume of the oil phase is 30 ml. Then 1.42g (0.01mol) of glycidyl methacrylate and 3.09g (0.015mol) of sodium p-styrene sulfonate are weighed according to a certain proportion and added into 15ml of deionized water, and after dissolution, the materials are added into an oil phase by using a syringe and react for 6h at 75 ℃. And weighing 7.1g (0.1mol) of acrylamide, adding the acrylamide into 10ml of deionized water, stirring and dissolving, adding a water phase into an oil phase, wherein the volume of the water phase is 35ml, finally adding 0.036g (0.158mmol) of ammonium persulfate, 0.036g (0.346mmol) of sodium bisulfite initiator and 0.6g (1.57mmol) of sodium tetraborate decahydrate crosslinking agent, and reacting for 4h to obtain the emulsion type degradable polyacrylamide drag reducer.
Example 3
The other steps are the same as example 1, except that the mass of the sodium p-styrene sulfonate is changed from 3.09g (0.015mol) to 4.12g (0.02mol), and the mass of the sodium tetraborate decahydrate is changed from 0.4g (1.05mmol) to 0.5g (1.31 mmol);
example 4
The other steps are the same as example 2, except that the mass of sodium p-styrenesulfonate is changed from 3.09g (0.015mol) to 5.15g (0.025mol), and the mass of sodium tetraborate decahydrate is changed from 0.6g (1.57mmol) to 0.7g (1.84 mmol);
comparative example 1
A commercial drag reducer degradation test comprising the steps of
(1) 1ml of a commercial drag reducer (oil drilling technology, 2015,43(01),27-32) was diluted in 1000ml of water and stirred well. Then 10ml of diluted commercial drag reducer is taken to soak a small amount of shale ceramsite for 12 hours at 70 ℃, and then the shale ceramsite is washed for many times by a large amount of clear water, and then the shale ceramsite is dried and then subjected to electron microscope test.
Comparative example 2
A degradation test of a degradable polyacrylamide drag reducer with high drag reduction and high salt resistance comprises the following steps
(1) A small amount of the product obtained in example 1 was taken and dissolved in water to prepare a 0.1% (w) solution. After the shale ceramisite is fully and uniformly dissolved, 10ml of solution is taken to soak a small amount of shale ceramisite for 12 hours at 70 ℃, then a large amount of clear water is used for washing for many times, then drying is carried out, and the test of an electron microscope is carried out on the shale ceramisite.
(2) Adding 1ml of the emulsion obtained in the example 2 into 1000ml of water for dilution and uniformly stirring, then soaking a small amount of shale ceramsite in 10ml of diluted solution at 70 ℃ for 12 hours, then washing with a large amount of clear water for multiple times, drying, and then testing the shale ceramsite by an electron microscope.
As shown in fig. 1, it can be seen from different magnification sizes of an electron microscope that the commercial drag reducer is not completely degraded, some drag reducers are still adsorbed on shale particles after use, and a cross-linking phenomenon occurs, which blocks shale cracks and affects construction operation in industrial application; in contrast, in examples 1 and 2, after use, the polymer was degraded and broken, and no crosslinking occurred. Therefore, during construction operation, the liquid is smoothly discharged along with the flow-back liquid, and the operation efficiency is improved.
Comparative example 3
A drag reduction test for commercial drag reducers (oil drilling technology, 2015,43(01),27-32) comprising the following steps
The drag reduction rate of the drag reducer is measured by a flow loop friction resistance testing device according to the standard SY/T6376-2008 'general technical conditions for fracturing fluid' in the oil and gas industry. The drag reduction ratio η is calculated as follows.
η ═ (Δ Pw- Δ Ps)/Δ Pw wherein: Δ Pw, the stable pressure difference, Pa, of the clear water flowing through the pipeline; Δ Ps — the steady pressure differential, Pa, of the drag reducing agent as it flows through the pipeline.
According to literature reports, the drag reduction rate of commercial drag reducers is mostly about 50 to 65 percent.
Comparative example 4
The method for testing the drag reduction rate of the degradable polyacrylamide drag reducer with high drag reduction and high salt resistance comprises the following steps as in comparative example 3
(1) A small amount of the product obtained in example 1 was taken and dissolved in water to prepare a 0.1% (w) solution. It was added to the flow circuit friction resistance test apparatus. The drag reduction rate was obtained by measuring the steady pressure difference between when 0.1% (w) of drag reducer was added to the fresh water and when the fresh water passed through the pipeline, respectively, as shown in example 1 of FIG. 2.
(2) A small amount of the product from example 2 was taken and dissolved in water to make a 0.1% (w) solution. It was added to the flow loop friction resistance test apparatus. The drag reduction rate was obtained by measuring the steady pressure difference between when 0.1% (w) drag reducer was added to the clean water and when the clean water passed through the pipeline, respectively, as shown in example 2 of FIG. 2.
Examples 1 and 2 are the preparation of high drag reducing, high salt resistance degradable polyacrylamide drag reducing agent of the present invention using different methods. Comparative example 1 is a test of a commercial drag reducer with respect to degradation, and comparative example 2 is a test of a high drag reducing, high salt resistance degradable polyacrylamide drag reducer with respect to degradation. As can be seen from the attached figure 1, under different enlarged sizes, the commercial drag reducer has the condition of adsorption, the cross-linking phenomenon is serious, and the construction is influenced; the high-resistance, high-salt-resistance and degradable polyacrylamide drag reducer has no adsorption phenomenon and is completely degraded. Therefore, the degradation of the drag reducer is relatively good. Comparative example 3 is an illustration of commercial drag reducers with respect to drag reduction rates, which are reported in some literature to be mostly around 50% to 65%. When the linear speeds are respectively 3m/s, 5m/s, 8m/s and 10m/s, the drag reduction rates are respectively 53%, 57%, 60% and 62%; comparative example 4 is a test of the high drag reduction and high salt resistance degradable polyacrylamide drag reducer on drag reduction rate, and as can be seen from fig. 2, the drag reduction rates of example 1 and example 2 are substantially the same. Wherein, in the embodiment 1, when the linear speeds are respectively 3m/s, 5m/s, 8m/s and 10m/s, the drag reduction rates are respectively 61%, 66%, 69% and 70%; in example 2, the drag reduction ratios were 64%, 67%, 70% and 71% at linear velocities of 3m/s, 5m/s, 8m/s and 10m/s, respectively. Therefore, the drag reducer has a good drag reduction effect.
In order to verify the properties of the products obtained in examples 1-2 above, the following characterization tests were carried out.
(I) Infrared Spectroscopy
The copolymer drag reducing agents prepared in example 1 and example 2 were tested by infrared spectroscopy by adding a small amount of dried sample to spectrally pure potassium bromide for grinding and tableting, and then testing using a Brucker TENSOR27 fourier transform infrared spectrometer. FIGS. 3 and 4 are IR spectra of a copolymer drag reducing agent, schematically illustrated in FIG. 3, 3415cm-1Is free-NH2Characteristic absorption peak of 3205cm-1Is characterized by an associated characteristic absorption peak of 2935cm-1Is a characteristic absorption peak of methylene antisymmetric stretching vibration, 2852cm-1Is a characteristic absorption peak of methylene symmetric stretching vibration, which is 1673cm-1Characteristic absorption peak at 1613cm of carbonyl group-1Is characterized by an amide II characteristic absorption peak of 1433cm-1Is a characteristic absorption peak of methylene deformation at 1186cm-1The characteristic absorption peak of the sulfonic acid group is 1121cm-1The absorption peak is shown in the cationization product spectrogramClearly, it is related to C-N stretching vibration. This is also true of fig. 4, where the data varies slightly, so that both methods are feasible to successfully synthesize the final structural material in the embodiments, the polymer drag reducer.
Nuclear magnetic hydrogen spectrum
The drag reducing agents prepared in both example 1 and example 2 were subjected to nuclear magnetic hydrogen spectroscopy, specifically, a small amount of copolymer drag reducing agent was added to heavy water (D)2O) and dissolved by an ultrasonic cleaner. After the solvent is dissolved, the solvent is added into a nuclear magnetic tube for nuclear magnetic hydrogen spectrum test. Fig. 5 and 6 are nuclear magnetic resonance hydrogen spectra of the copolymer, and schematically illustrated in fig. 5, and when δ is 2.39ppm, δ is 1.45ppm, and δ 0 is 6.16ppm, these peaks are an explanation of an acrylamide moiety in the polymer; these peaks are an explanation for the sodium styrene sulfonate moiety in the polymer at δ 1-2.75 ppm, δ 1.86ppm, δ 7.55ppm, and δ 7.7 ppm; these peaks are the description of the 2, 3-dihydroxypropyl methacrylate moiety in the polymer at δ 1.05ppm, δ 1.8ppm, δ 4.12ppm, δ 3.55ppm and δ 3.48 ppm. Wherein m is (1-10), n is (1-10), and p is (1-10). This is also true of fig. 6, where the data varies slightly, so that both methods are feasible to successfully synthesize the final structural material in the embodiments, the polymer drag reducer.
The above description is only a few preferred embodiments of the present invention, but the present invention is not limited to the above-mentioned embodiments. The foregoing detailed description is to be considered as illustrative and not restrictive, and changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention.
The invention is not the best known technology.

Claims (2)

1. A preparation method of a degradable polyacrylamide drag reducer with high drag reduction and high salt resistance is characterized by comprising the following two methods:
the method I comprises the following steps: adding a solution containing glycidyl methacrylate and sodium p-styrenesulfonate into a reactor under the nitrogen atmosphere and magnetic stirring, reacting for 4-12 h at 40-100 ℃, then adding an acrylamide solution, adding a compound initiator and a cross-linking agent borax, reacting for 4-6 h to obtain a milky gel, and freeze-drying and crushing to obtain the high-drag-reduction high-salt-resistance degradable polyacrylamide drag reducer;
wherein, the molar ratio is that glycidyl methacrylate: sodium p-styrenesulfonate: acrylamide (1-10): (1-10): (1-10), wherein the mass of the borax cross-linking agent is 1-10% of the total mass of all materials in the first method;
adding 0.01-0.1 mol of glycidyl methacrylate into 10-50 ml of water in a solution containing glycidyl methacrylate and sodium p-styrenesulfonate; the concentration of the acrylamide solution is 0.001-0.1 mol/ml; adding 0.1-1 mmol of compound initiator into every 10ml of acrylamide solution; the compound initiator comprises ammonium persulfate and sodium bisulfite, and the molar ratio of the ammonium persulfate to the sodium bisulfite is as follows: sodium bisulfite (0.1 to 1): (0.1 to 1);
the second method comprises the following steps: adding white oil and an emulsifier into a reactor, and emulsifying for 30-60 min under stirring in a nitrogen atmosphere to obtain an oil phase; then adding the water phase into the oil phase, and reacting for 4-12 h at 40-100 ℃; then adding an acrylamide solution, and finally adding a compound initiator and a cross-linking agent borax for reacting for 4-6 h to obtain the degradable polyacrylamide drag reducer with high drag reduction and high salt resistance;
wherein the water phase is an aqueous solution containing glycidyl methacrylate and sodium p-styrenesulfonate, and 0.01-0.1 mol of glycidyl methacrylate and 0.01-0.1 mol of sodium p-styrenesulfonate are added into every 10-50 ml of deionized water; the molar ratio of glycidyl methacrylate: sodium p-styrenesulfonate: (1-10): (1-10): (1-10);
the concentration range of the acrylamide solution is 0.001-0.1 mol/ml; adding 0.1-1 mmol of compound initiator into every 10ml of acrylamide solution; the compound initiator comprises ammonium persulfate and sodium bisulfite, and the molar ratio of the ammonium persulfate to the sodium bisulfite is as follows: sodium bisulfite (0.1 to 1): (0.1 to 1); the mass of the cross-linking agent borax is 1-10% of the total mass of all the materials in the second method;
adding 3-10 g of emulsifier into every 20g of white oil, wherein the volume ratio of the water phase to the oil phase is 1: 0.5 to 1.5.
2. The preparation method of the high drag reduction and high salt resistance degradable polyacrylamide drag reducer as claimed in claim 1, wherein in the second method, the emulsifier is span 80 and tween 80, and the mass ratio is (10-20): 1.
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CN107828024A (en) * 2017-11-06 2018-03-23 陕西盛迈石油有限公司 The preparation method of polymer filtrate reducer
US20180112125A1 (en) * 2016-10-25 2018-04-26 Yangtze University Combo Hydraulic Fracturing Fluid Concentrate Having Both Drag Reduction and Sand-Carrying Properties
CN108130059A (en) * 2018-01-30 2018-06-08 四川泓华油气田工程科技有限公司 Fluid loss additive for boring fluid and preparation method thereof
CN111234097A (en) * 2020-01-15 2020-06-05 西南石油大学 Salt-tolerant quinary hydrophobic association polymer and preparation method and application thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105254804A (en) * 2015-09-23 2016-01-20 山东聚鑫化工有限公司 High temperature and salt resistant oil displacement agent
US20180112125A1 (en) * 2016-10-25 2018-04-26 Yangtze University Combo Hydraulic Fracturing Fluid Concentrate Having Both Drag Reduction and Sand-Carrying Properties
CN107828024A (en) * 2017-11-06 2018-03-23 陕西盛迈石油有限公司 The preparation method of polymer filtrate reducer
CN108130059A (en) * 2018-01-30 2018-06-08 四川泓华油气田工程科技有限公司 Fluid loss additive for boring fluid and preparation method thereof
CN111234097A (en) * 2020-01-15 2020-06-05 西南石油大学 Salt-tolerant quinary hydrophobic association polymer and preparation method and application thereof

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