CN114605680B - Preparation method of high-drag-resistance high-salt-resistance degradable polyacrylamide drag reducer - Google Patents
Preparation method of high-drag-resistance high-salt-resistance degradable polyacrylamide drag reducer Download PDFInfo
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Abstract
The invention relates to a preparation method of a high drag reduction and high salt resistance degradable polyacrylamide drag reducer. According to the method, sodium p-styrenesulfonate is used for inducing and catalyzing glycidyl methacrylate to open a ring to obtain 2, 3-dihydroxypropyl methacrylate, and the sodium p-styrenesulfonate which is not completely reacted and the obtained 2, 3-dihydroxypropyl methacrylate can be continuously utilized to carry out the next reaction under the action of acrylamide, an initiator and a cross-linking agent, so that the required polymer drag reducer is obtained. In the invention, the obtained drag reducer has good salt tolerance because of the sulfonic acid group of sodium styrene sulfonate. In this process, sodium styrene sulfonate plays an important role, and serves as a catalyst for preliminary reaction and one of the synthetic raw materials of the final polymerization product.
Description
Technical field:
the invention belongs to the field of drag reducer slickwater. In particular to a preparation method of a high drag reduction and high salt resistance degradable polyacrylamide drag reducer.
The background technology is as follows:
in the shale gas exploitation process, due to poor physical properties of a reservoir, the reservoir is often required to be subjected to fracturing volume transformation during construction, so that cracks are generated for diversion, and the slickwater can be used for improving the production recovery ratio. Slick water has many excellent characteristics such as lower viscosity, easy flowback, lower damage to reservoirs, low price and low cost. In the construction process, the residue is less after the use is finished, and the residual gel amount is also less. Among the constituents of slickwater, the most important of them is the acrylamide-based polymer drag reducer (applied chemical, 2020,49 (05), 1138-1142). Unlike conventional fracturing fluids, which have relatively high viscosity, gel formation is relatively easy, while polymer concentrations in slick water fracturing fluids are relatively low. 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, certain relatively large friction resistance is generated between the fluid and the pipe wall for the water of Newtonian fluid, so that the phenomenon that the fracturing fluid is turbulent in a pipeline occurs, the flowing of the slickwater fracturing fluid in the pipeline is hindered, the conveying capacity 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 auxiliary agent capable of reducing friction 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 quickly reduced under the condition of turbulence, thereby reducing energy consumption and improving the conveying efficiency (petrochemical engineering, 2015,44 (05), 607-611). Drag reducers are of different types, such as being resistant to high temperatures, being resistant to salt types, 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, the biggest feature of these monomers being the inclusion of strong electrolyte groups or cyclic structural groups. For example, sulfonate groups are believed to be capable of forming stronger hydrogen bonds with water, and thus may improve the stability of the copolymer in solution. In addition, the sulfonate group has relatively good 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 resistance of the copolymer, which has important significance for the copolymer drag reducer (applied chemical industry, 2019,48 (01), 113-117).
The slick water system can reduce the load of fracturing construction equipment, effectively increase the construction net pressure, greatly reduce the friction 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, a slick water fracturing technology plays an important role in the exploitation process of shale gas at home and abroad, becomes a main yield increasing technology in the exploitation process, and slick water is one of the most common liquids in shale reservoir fracturing reconstruction (petroleum drilling technology, 2015,43 (01), and 27-32).
The invention comprises the following steps:
the invention aims to provide a preparation method of a high-drag-resistance high-salt-resistance degradable polyacrylamide drag reducer aiming at the defects of the current slick hydraulic fracturing fluid system. According to the method, sodium p-styrenesulfonate is used for inducing and catalyzing glycidyl methacrylate to open a ring to obtain 2, 3-dihydroxypropyl methacrylate, and the sodium p-styrenesulfonate which is not completely reacted and the obtained 2, 3-dihydroxypropyl methacrylate can be continuously utilized to carry out the next reaction under the action of acrylamide, an initiator and a cross-linking agent, so that the required polymer drag reducer is obtained. In addition, the resulting drag reducer has good salt tolerance because of the sulfonic acid groups of sodium p-styrenesulfonate. In this process, sodium styrene sulfonate plays an important role, and serves as a catalyst for preliminary reaction and one of the synthetic raw materials of the final polymerization product.
The technical scheme of the invention is as follows:
the preparation method of the high drag reduction and high salt resistance degradable polyacrylamide drag reducer is one of the following two methods:
the method I comprises the following steps: under the atmosphere of nitrogen and magnetic stirring, adding a solution containing glycidyl methacrylate and sodium p-styrenesulfonate into a reactor, reacting for 4-12 hours at 40-100 ℃, then adding an acrylamide solution, adding a compound initiator and a cross-linking agent borax, reacting for 4-6 hours to obtain milky gel, and obtaining the high-drag-resistance high-salt-resistance degradable polyacrylamide drag reducer after freeze drying and crushing;
wherein, the molar ratio is that glycidyl methacrylate: sodium p-styrenesulfonate: acrylamide= (1-10): (1-10): (1-10), wherein the mass of borax is 1-10% of the total mass of all materials in the method one;
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 mol/ml-0.1 mol/ml; adding 0.1-1 mmol of compound initiator into 10ml of acrylamide solution (wherein the mole number of the compound initiator is the sum of the mole numbers of the two compound substances); the composition of the compound initiator is ammonium persulfate and sodium bisulfite, and the molar ratio is that ammonium persulfate: sodium bisulphite= (0.1-1): (0.1 to 1);
the second method comprises the following steps: adding white oil and an emulsifying agent 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 ℃; adding an acrylamide solution, and finally adding a compound initiator and a cross-linking agent borax to react for 4-6 hours to obtain the high-drag-resistance high-salt-resistance degradable polyacrylamide drag reducer;
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 is that glycidyl methacrylate: sodium p-styrenesulfonate: acrylamide= (1-10): (1-10): (1-10);
the concentration range of the acrylamide solution is 0.001 mol/ml-0.1 mol/ml; adding 0.1-1 mmol of compound initiator into each 10ml of acrylamide solution; the composition of the compound initiator is ammonium persulfate and sodium bisulfite, and the molar ratio is that ammonium persulfate: sodium bisulphite= (0.1-1): (0.1 to 1); the mass of the cross-linking agent borax is 1-10% of the total mass of all materials in the second method;
3-10 g of emulsifying agent is added into each 20g of white oil, the emulsifying agent 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 substantial characteristics that:
aiming at the technical problem of a slick water fracturing fluid system, the invention reacts sodium p-styrenesulfonate containing sulfonic acid groups and 2, 3-dihydroxypropyl methacrylate containing hydroxyl groups with acrylamide to generate a novel high-drag-resistance high-salt-resistance degradable polyacrylamide drag reducer 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 few propping agents, a small amount of surfactants, clay stabilizers, cleanup additives, anti-swelling agents, gel breakers, bactericides and the like are added to prepare slick water, so that the polymer drag reducer can be well applied to petrochemical industry. When the drag reducer is added into the oil product, the radial movement of the oil product molecules can be limited, and the oil product molecules can flow along the direction of the pipeline, so that the disorder movement condition of the oil product molecules can be effectively reduced, and the friction resistance between the oil product molecules and the pipeline is reduced. According to the hydrodynamic principle, the trend of laminar flow is more obvious, the friction resistance coefficient is smaller, and the drag reducer achieves the purposes of reducing resistance and increasing conveying capacity by the mode.
The beneficial effects of the invention are as follows:
the beneficial results of the invention are that the obtained polyacrylamide drag reducer has good drag reduction, salt tolerance and degradability. In the preparation process, the sodium styrene sulfonate plays an important role. The catalyst is used as a catalyst for primary reaction and one of the synthetic raw materials of the final product, and the step of secondary addition is omitted. Meanwhile, the sulfonic acid group contained in the polymer drag reducer is also a source of salt tolerance of the polymer drag reducer. And (3) carrying out copolymerization reaction on sodium p-styrenesulfonate, 2, 3-dihydroxypropyl methacrylate obtained by inducing and catalyzing the ring opening of glycidyl methacrylate, acrylamide, an initiator and a cross-linking agent to obtain the polyacrylamide drag reducer. The polyacrylamide drag reducer was characterized for degradability and drag reduction, with the following results. In terms of degradability, it can be seen through electron microscopy that commercial drag reducer is incompletely degraded and has a cross-linking phenomenon, which can block shale cracks and affect construction operation in industrial application. The polyacrylamide drag reducer can be seen through an electron microscope, and after the use is finished, the polyacrylamide drag reducer is degraded and crushed, and the cross-linking phenomenon is avoided. In the construction operation, the waste liquid can be smoothly discharged along with the flow-back liquid, thereby facilitating the construction operation, and the flow-back liquid is shown in fig. 1. In terms of drag reduction, the commercial drag reducer had a drag reduction of 53% at line speed of 3m/s, while the drag reducer had a drag reduction of 61% for method one and 64% for method two at line speed of 3m/s, see FIG. 2. Also, at different linear velocities, the drag reducer has an average drag reduction rate that is about 8% higher than commercial drag reducers. The degradation performance of the drag reducer is good, so that the drag reducer has low damage to shale cores, is not easy to block shale cracks, and can be well applied to petrochemical engineering. In addition, after the drag reducer slick water is added into the pipeline for conveying petroleum, the turbulence condition of the petroleum product in the pipeline can be restrained, the friction between the petroleum product and the pipeline wall is reduced, the pressure of the pipeline is relieved, and the running safety of the pipeline is further ensured. Meanwhile, the capacity of long-distance conveying pipelines is improved, the energy consumption of the system is reduced, and the conveying efficiency is further improved.
Drawings
FIG. 1 is an electron micrograph of different drag reducing agents with respect to degradation performance;
FIG. 2 is a graph of various drag reducing agents with respect to drag reduction rate;
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 resonance hydrogen spectrum of the copolymer drag reducer obtained in example 1;
FIG. 6 is a nuclear magnetic resonance hydrogen spectrum of the copolymer drag reducer obtained in example 2.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the detailed description is intended to illustrate the invention, and not to limit the invention.
The first step of the reaction mechanism of the method is shown in a reaction formula 1: the glycidyl methacrylate reacts for 6 hours at 75 ℃ under the condition of introducing nitrogen and deoxidizing, the ring opening of the glycidyl methacrylate is promoted by the induction effect of sodium styrene sulfonate, and the ring opening product is utilized for the next reaction.
The second step of the first reaction mechanism of the method is shown in a reaction formula 2: the glycidyl methacrylate is subjected to catalytic induction of sodium styrene sulfonate, and reacts with acrylamide for 10 hours under the conditions of nitrogen introducing and deoxidization, 75 ℃ and total reaction, and under the action of ammonium persulfate, sodium bisulfate compound initiator and borax cross-linking agent, and the copolymer drag reducer is obtained after the reaction is finished. The reaction mechanism of the second method is also the same.
The high drag reduction and high salt resistance degradable polyacrylamide drag reducer is applied to petrochemical industry, and the polymer drag reducer is added into a large amount of water, and then a few proppants, a small amount of surfactants, clay stabilizers, cleanup additives, anti-swelling agents, gel breakers, bactericides and the like are added to prepare slick water. Meanwhile, the degradation effect of the drag reducer can be examined. Examples 1 and 2 are two methods of preparing copolymer drag reducers.
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 the degradable polyacrylamide drag reducer by an aqueous solution polymerization method: a magnet was placed in the reaction tube, oxygen in the tube was purged with nitrogen, 1.42g (0.01 mol) of glycidyl methacrylate and 3.09g (0.015 mol) of sodium p-styrenesulfonate were added to 15ml of deionized water, and after dissolution, they were added to the reaction tube by syringe and reacted at 75℃for 6 hours. 7.1g (0.1 mol) of acrylamide was dissolved in 10ml of deionized water, and after dissolution, it was added to the reaction tube by syringe. Then 0.036g (0.158 mmol) ammonium persulfate, 0.036g (0.346 mmol) sodium bisulfite initiator and finally 0.4g (1.05 mmol) sodium tetraborate decahydrate are added. Regulating the heat-collecting constant-temperature magnetic stirrer to 500r/min, reacting for 4 hours to obtain milky gel, and freeze-drying and crushing the milky 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 the 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 magneton, introducing nitrogen to remove oxygen, fully emulsifying for 30min under the condition of uniform stirring, and keeping the volume of the oil phase to be 30ml. Then 1.42g (0.01 mol) of glycidyl methacrylate and 3.09g (0.015 mol) of sodium p-styrenesulfonate are weighed according to a certain proportion and added into 15ml of deionized water, and after dissolution, the mixture is added into an oil phase by a syringe and reacted for 6 hours at 75 ℃. Then, 7.1g (0.1 mol) of acrylamide is weighed, added into 10ml of deionized water, stirred and dissolved, then, the water phase is added into the oil phase, the volume of the water phase is 35ml, finally, 0.036g (0.158 mmol) of ammonium persulfate, 0.036g (0.346 mmol) of sodium bisulfite initiator and 0.6g (1.57 mmol) of sodium tetraborate decahydrate cross-linking agent are added, and the mixture is reacted for 4 hours, thus obtaining the emulsion type degradable polyacrylamide drag reducer.
Example 3
The other steps were the same as in example 1 except that the mass of sodium p-styrenesulfonate was changed from 3.09g (0.015 mol) to 4.12g (0.02 mol), and the mass of sodium tetraborate decahydrate was changed from 0.4g (1.05 mmol) to 0.5g (1.31 mmol);
example 4
The other steps were the same as in example 2 except that the mass of sodium p-styrenesulfonate was changed from 3.09g (0.015 mol) to 5.15g (0.025 mol), and the mass of sodium tetraborate decahydrate was changed from 0.6g (1.57 mmol) to 0.7g (1.84 mmol);
comparative example 1
A commercial drag reducer degradation test comprising the steps of
(1) 1ml of commercial drag reducer (petroleum drilling technology, 2015,43 (01), 27-32) was added to 1000ml of water and diluted and stirred well. Then 10ml of diluted commercial drag reducer is taken to soak a small amount of shale ceramisite for 12 hours at 70 ℃, then a large amount of clean water is used for cleaning for many times, then drying is carried out, and then electron microscopy test is carried out on the shale ceramisite.
Comparative example 2
A degradation test of a high drag reduction and high salt resistance degradable polyacrylamide drag reducer comprises the following steps of
(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 fully and uniformly dissolving, 10ml of solution is taken to soak a small amount of shale ceramsite for 12 hours at 70 ℃, then a large amount of clear water is used for cleaning for many times, then drying is carried out, and electron microscope testing is carried out on the shale ceramsite.
(2) 1ml of the emulsion obtained in the example 2 is added into 1000ml of water for dilution and uniform stirring, then 10ml of diluted solution is used for soaking a small amount of shale ceramisite for 12 hours at 70 ℃, then a large amount of clear water is used for cleaning for many times, drying is carried out, and then electron microscope testing is carried out on the shale ceramisite.
As shown in figure 1, according to different enlarged sizes of the electron microscope, commercial drag reducer is not completely degraded, part of drag reducer is adsorbed on shale particles after being used, and cross-linking phenomenon occurs, so that shale cracks can be blocked in industrial application, and construction operation is influenced; in example 1 and example 2, the materials were degraded and crushed after use, and no crosslinking phenomenon occurred. Therefore, during the construction operation, the flow-back fluid is smoothly discharged, and the working efficiency is improved.
Comparative example 3
A resistivity-reducing test of a commercial drag reducer (oil drilling technique, 2015,43 (01), 27-32), comprising the steps of
And (3) measuring the drag reduction rate of the drag reducer by using a flow loop friction resistance testing device according to the oil and gas industry standard SY/T6376-2008 general technical Condition of fracturing fluids. Drag reduction rate η is calculated as follows.
η= (Δpw- Δps)/Δpw formula: Δpw—steady pressure differential, pa, as the clear water flows through the pipeline; ΔPs-steady pressure differential, pa, as the drag reducing agent flows through the pipeline.
According to literature reports, the reduction rate of commercial drag reducers is mostly about 50% -65%.
Comparative example 4
A method for testing the drag reduction rate of a high drag reduction and high salt resistance degradable polyacrylamide drag reducer is the same as that of comparative example 3, and comprises the following steps of
(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 loop friction testing device. The steady pressure difference between when 0.1% (w) drag reducer was added to the clear water and when the clear water passed through the pipeline was measured to obtain the drag reduction ratio, as shown in example 1 of fig. 2.
(2) A small amount of the product obtained in example 2 was taken and dissolved in water to prepare a 0.1% (w) solution. It was added to the flow loop friction testing device. The steady pressure difference between when 0.1% (w) drag reducer was added to the clear water and when the clear water passed through the pipeline was measured to obtain the drag reduction ratio, as shown in example 2 of fig. 2.
Examples 1 and 2 are the preparation of the present invention degradable polyacrylamide drag reducer with high drag reduction and high salt resistance using different methods. Comparative example 1 is a commercial drag reducer test for degradation and comparative example 2 is a high drag reduction high salt resistance degradable polyacrylamide drag reducer test for degradation. As can be seen from fig. 1, under different enlarged sizes, the commercial drag reducer has adsorption, so that the crosslinking phenomenon is serious, and the construction is affected; and the high drag reduction and high salt resistance degradable polyacrylamide drag reducer has no adsorption phenomenon and is completely degraded. Therefore, the degradability of the drag reducer is relatively good. Comparative example 3 is illustrative of commercial drag reducers with regard to drag reduction rates, which according to some literature reports are mostly around 50% -65%. The resistivity was 53%, 57%, 60% and 62% respectively at linear speeds of 3m/s, 5m/s, 8m/s and 10m/s, respectively; comparative example 4 is a test of a high drag reduction, high salt resistance, degradable polyacrylamide drag reducer with respect to drag reduction ratio, as can be seen from fig. 2, the drag reduction ratios of example 1 and example 2 are substantially the same. Wherein, in example 1, the resistivity was 61%, 66%, 69% and 70% when the line speeds were 3m/s, 5m/s, 8m/s and 10m/s, respectively; in example 2, the reduction ratios were 64%, 67%, 70% and 71% at line speeds of 3m/s, 5m/s, 8m/s and 10m/s, respectively. Therefore, the drag reducer has better drag reduction effect.
To verify the properties of the products obtained in examples 1-2 above, the following relevant characterization tests were performed.
(one) Infrared Spectrum
The copolymer drag reducer prepared by the two methods in example 1 and example 2 was subjected to infrared spectroscopy, specifically, a small amount of dried sample was added to spectrally pure potassium bromide for grinding and tabletting, and then a Brucker company's ten nsor27 fourier transform infrared spectrometer was used for testing. FIGS. 3 and 4 are IR spectra of copolymer drag reducers, briefly illustrated in FIG. 3, 3415cm -1 Is free-NH 2 Characteristic absorption peak of 3205cm -1 Is characterized by an association characteristic absorption peak of 2935cm -1 Is characterized by an absorption peak of methylene antisymmetric telescopic vibration, 2852cm -1 The position is a characteristic absorption peak of symmetric stretching vibration of methylene, which is 1673cm -1 At the characteristic absorption peak of carbonyl group, 1613cm -1 The characteristic absorption peak of amide II is 1433cm -1 The characteristic absorption peak of methylene deformation is 1186cm -1 Is characterized by a characteristic absorption peak of sulfonic acid group, 1121cm -1 The absorption peak is obvious in the cationization product spectrogram and is related to C-N stretching vibration. As such, fig. 4 shows a slight variation in the data, so both methods are feasible, successful in synthesizing the final structural material, i.e., the polymeric drag reducer, in the embodiments.
(II) Nuclear magnetic Hydrogen Spectrometry
The drag reducer prepared by the two methods of example 1 and example 2 were subjected to nuclear magnetic hydrogen spectroscopy, specifically by adding a small amount of copolymer drag reducer to heavy water (D 2 O), and dissolved by an ultrasonic cleaner. After it is dissolved, it is added into nuclear magnetic tube to test nuclear magnetic hydrogen spectrum. Fig. 5 and 6 are nuclear magnetic resonance hydrogen spectra of the copolymer, and are briefly described with reference to fig. 5, and when δ=2.39 ppm, δ=1.45 ppm, and δ0=6.16 ppm, these peaks are descriptions of acrylamide moieties in the polymer; at δ=2.75 ppm, δ=1.86 ppm, δ=7.55 ppm and δ=7.7 ppm, these peaks are illustrative of the sodium p-styrenesulfonate moiety in the polymer; at δ=1.05 ppm, δ=1.8 ppm, δ=4.12 ppm, δ=3At 55ppm and delta=3.48 ppm, these peaks are illustrative of 2, 3-dihydroxypropyl methacrylate moieties in the polymer. Wherein, m= (1-10), n= (1-10), p= (1-10). As is also the case with fig. 6, the data is slightly changed, so both methods are feasible, successful in synthesizing the final structural material, i.e., the polymeric drag reducer, in the embodiment.
The foregoing description is only a few preferred embodiments of the present invention, but the present invention is not limited to the specific embodiments described above. The particular embodiments disclosed above are illustrative only and not limiting as the present invention may be modified and practiced in different but equivalent manners apparent to those skilled in the art having the benefit of the teachings herein, wherein the modifications and improvements are made within the scope of the invention.
The invention is not a matter of the known technology.
Claims (2)
1. A preparation method of a high drag reduction and high salt resistance degradable polyacrylamide drag reducer is characterized by comprising one of the following two methods:
the method I comprises the following steps: under the atmosphere of nitrogen and magnetic stirring, adding a solution containing glycidyl methacrylate and sodium p-styrenesulfonate into a reactor, reacting for 4-12 hours at 40-100 ℃, then adding an acrylamide solution, adding a compound initiator and a cross-linking agent borax, reacting for 4-6 hours to obtain milky gel, and obtaining the high-drag-resistance high-salt-resistance degradable polyacrylamide drag reducer after freeze drying and crushing;
wherein, the molar ratio is that glycidyl methacrylate: sodium p-styrenesulfonate: acrylamide= (1-10): (1-10): (1-10), wherein the mass of the borax crosslinking agent is 1-10% of the total mass of all materials in the method one;
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 mol/ml-0.1 mol/ml; adding 0.1-1 mmol of compound initiator into each 10ml of acrylamide solution; the composition of the compound initiator is ammonium persulfate and sodium bisulfite, and the molar ratio is that ammonium persulfate: sodium bisulphite= (0.1-1): (0.1 to 1);
the second method comprises the following steps: adding white oil and an emulsifying agent 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 ℃; adding an acrylamide solution, and finally adding a compound initiator and a cross-linking agent borax to react for 4-6 hours to obtain the high-drag-resistance high-salt-resistance degradable polyacrylamide drag reducer;
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 is that glycidyl methacrylate: sodium p-styrenesulfonate: acrylamide= (1-10): (1-10): (1-10);
the concentration range of the acrylamide solution is 0.001 mol/ml-0.1 mol/ml; adding 0.1-1 mmol of compound initiator into each 10ml of acrylamide solution; the composition of the compound initiator is ammonium persulfate and sodium bisulfite, and the molar ratio is that ammonium persulfate: sodium bisulphite= (0.1-1): (0.1 to 1); the mass of the cross-linking agent borax is 1-10% of the total mass of all materials in the second method;
3-10 g of emulsifier is added into each 20g of white oil, and the volume ratio of water phase to oil phase is 1:0.5 to 1.5.
2. The method for preparing 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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| 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 |
| 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 |
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| 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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| 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 |
| 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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