CN114014994A - Resistance reducing agent capable of mixing and adjusting viscosity on line, resistance reducing type fracturing fluid and preparation method thereof - Google Patents
Resistance reducing agent capable of mixing and adjusting viscosity on line, resistance reducing type fracturing fluid and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a drag reducer capable of on-line mixing and viscosity adjustment, a drag reducer type fracturing fluid and a preparation method thereof, wherein an acrylamide monomer, sodium allylsulfonate, methoxy polyethylene glycol acrylate and tert-butyl acrylamide sulfonic acid are dissolved in a water phase of deionized water, an emulsion prepared by adding the deionized water phase into an oil phase is reacted with an initiator to obtain a polymer emulsion drag reducer, and the polymer emulsion drag reducer is then mixed with a clay stabilizer, a cross-linking agent and water on line to obtain the drag reducer type fracturing fluid, wherein the drag reducer rate can reach more than 70% at most, the defects of high friction resistance, difficult sand carrying, complex process and the like of the conventional slickwater fracturing fluid can be overcome, and the drag reducer type fracturing fluid has the characteristics of improving the single well yield and the construction efficiency after oil and gas reservoir fracturing.
Description
Technical Field
The invention relates to a drag reducer and a drag reduction type fracturing fluid capable of on-line blending and viscosity adjustment and a preparation method thereof, in particular to a drag reducer of a polymer emulsion and a drag reduction type fracturing fluid for an oil field capable of on-line blending and viscosity adjustment and a preparation method thereof, belonging to the technical field of fracturing modification of oil and gas wells.
Background
The fracturing modification technology of oil and gas wells is an important technical measure for increasing the yield of the oil and gas wells and increasing the injection of water injection wells. The hydraulic fracturing is that high-viscosity liquid is injected into a well by utilizing a ground high-pressure pump set at a displacement greatly exceeding the liquid absorption capacity of a stratum, high pressure is suppressed at the bottom of the well, one or more cracks are generated in the stratum near the bottom of the well after the pressure exceeds the ground stress action near the well wall and the tensile strength of rock, sand-carrying liquid with a propping agent is continuously injected into the cracks under the high pump pressure, and the cracks extend forwards to form a complex crack network. After the pressure is released, the proppant props the fracture to form a sand filling fracture with high flow conductivity. In the fracturing process, fracturing fluid injected into a well is divided into pad fluid, sand carrying fluid and displacement fluid at different operation stages, different synergists and different concentrations are required to be added before conventional volume fracturing construction to prepare the three kinds of fluid in advance and then the three kinds of fluid are transported to a construction well site.
The deep shale reservoir in China has the reservoir characteristics of large stress difference, high formation water mineralization, high clay mineral content, no crack development and the like, the high temperature resistance and salt resistance functions of a fracturing fluid formula can be improved, the fracturing fluid is not influenced by formation high temperature and high mineralization formation water in a target layer, the viscosity is kept stable, the fracturing fluid is ensured to have certain plugging and pressure holding capacity at a micro-crack throat, the crack complexity index is improved, and the crack reconstruction volume is increased. However, the conventional vegetable gum slickwater has poor adaptability with a reservoir stratum, is easy to be retained in the reservoir stratum to cause reservoir stratum damage, has high self friction resistance, increases the friction resistance of a shaft due to large-displacement construction, increases pressure consumption, and can not overcome the high-pump pressure working requirement of huge flowing friction resistance for a long time by field equipment.
In order to reduce the flowing friction resistance of the fracturing fluid in a shaft, in the field of oil fields in recent years, hydrosol of anionic polyacrylamide polymer is often used as a resistance reducing additive of the fracturing fluid, and the polymer has the characteristics of strong hydrophilic group, high ultra-high molecular weight, good water solubility, strong thickening property and hydrophobic resistance reduction. The anionic polyacrylamide is mainly prepared by taking acrylamide and acrylic acid as polymerization monomers and carrying out copolymerization reaction in various ways. But the solubility of the anionic polyacrylamide obtained by copolymerizing acrylamide and acrylic acid in the formation water with medium and high salinity is greatly reduced, and the resistance reduction performance is greatly weakened. And the acrylic acid with high activity as a polymerization monomer as a main chain monomer has too fast polymerization reaction with acrylamide, the temperature rise during polymerization is obvious, and the polymerization reaction is easily exploded, so that the polymerization reaction is terminated too early, the molecular weight of a polymerization product is low, and the performance can not meet the requirements.
Aiming at the defects that the conventional fracturing fluid needs to be prepared in advance and then transported to a well site and solving the problem of high flowing friction resistance of the fracturing fluid, the invention needs to invent a resistance-reducing type fracturing fluid capable of mixing and viscosity-adjusting on line and a field application method, and meets the requirements of high sand carrying performance and low friction resistance of the fracturing fluid and the requirement of process simplification. And technical guarantee is provided for improving the single-well yield, the recovery ratio and the construction efficiency of the shale gas well.
The invention patent with publication number CN111471130A discloses an on-line mixed resistance reducing agent for variable viscosity fracturing and a preparation method thereof, wherein acrylamide monomers, double bond-containing cationic monomers, an anionic polymer template, a chelating agent, a molecular weight regulator and water are mixed and the pH value is regulated to obtain an aqueous solution with the pH value of 3-5; contacting an organic solvent with an emulsifier to obtain an oil solution; then contacting the aqueous solution with an oil solution to obtain an emulsion; under inert atmosphere, the emulsion is contacted with an initiator in batches, polymerization reaction is carried out, then a mixture obtained by the polymerization reaction is contacted with a phase transfer agent, and the mixture is proportioned and finished, and the emulsion has the characteristics of high resistance reduction rate, high clay swelling inhibition, good water solubility, good shearing resistance and low formation damage. This patent has two drawbacks: during the synthesis process, acrylamide can be hydrolyzed into acrylic acid in acid or alkali environment, so that the content of acrylic acid is increased, the content of acrylamide is reduced, the proportion of monomers is disordered, and the polymerization efficiency is greatly reduced. And long polyacrylamide chains generated by polymerization can be curled in a residual acid environment. In the practical application process, the high-molecular long chain of the main body of the resistance reducing agent is a cationic polyacrylamide polymer generated by the polymerization reaction of acrylamide and a double-bond-containing cationic monomer, and the cation of the cationic polymer can electrostatically adsorb negatively charged chloride ions in formation water on the chain thereof through the electrostatic action, so that dispersed small particles are aggregated into large particles, and the flocculation phenomenon occurs, thereby influencing the downhole work.
Disclosure of Invention
In order to overcome the defects of high friction resistance, difficult sand carrying, complex process and the like of the conventional slickwater fracturing fluid, the invention provides the resistance reducing agent capable of realizing on-line mixed viscosity adjustment and the preparation method thereof, and the resistance reducing type fracturing fluid prepared by adopting the on-line mixed viscosity adjustment mode by the resistance reducing agent, which can be directly used for pump injection construction, thereby greatly improving the yield and the construction efficiency of a single well after fracturing of an oil and gas reservoir.
The invention is realized by the following technical scheme: a preparation method of a viscosity-reducing agent capable of on-line blending and viscosity adjustment comprises the following steps:
s1, stirring solvent oil and an anionic emulsifier in a weight ratio of (92-95) to (5-8) at the rotating speed of 300-;
s2, dissolving an acrylamide monomer, sodium allylsulfonate, methoxypolyethylene glycol acrylate and tert-butylacrylamide sulfonic acid in deionized water, and adjusting the pH value of the system to (6.5-7) by using NaOH to prepare a water phase B, wherein the weight ratio of the acrylamide monomer, the sodium allylsulfonate, the methoxypolyethylene glycol acrylate, the tert-butylacrylamide sulfonic acid to the deionized water is (15-18) to (7.5-9.5) to (8-11) to (1.5-2.5) to (59-68);
s3, according to the oil phase A: slowly adding the water phase B into the oil phase A according to the volume ratio of 1 to (0.8-0.95), fully stirring and emulsifying to obtain emulsion, introducing nitrogen to remove oxygen in the system for 10-15min, dripping an initiator, carrying out polymerization reaction for 5-5.5h, and cooling to room temperature to obtain the polymer emulsion resistance reducing agent.
In the step S1, the solvent oil is petroleum ether, n-hexane, cyclohexane or white oil; the anionic emulsifier is sodium dodecyl benzene sulfonate, sodium didodecyl phenyl ether disulfonate or sodium dodecyl sulfate.
In the step S3, the initiator is sodium sulfite, ammonium persulfate or sodium persulfate.
The resistance reducing agent capable of mixing and blending viscosity on line is prepared by adopting the method.
A preparation method of a resistance-reducing fracturing fluid adopts a stirring and mixing tank to carry out on-line mixing on the polymer emulsion resistance-reducing agent of claim 4, a clay stabilizer, a cross-linking agent and water to prepare the resistance-reducing fracturing fluid, and the resistance-reducing fracturing fluid is prepared by the mass percent,
the polymer emulsion resistance reducing agent is 0.2-0.6%;
clay stabilizer 0.1-0.5%;
0.15 to 0.4 percent of cross-linking agent;
the balance being water.
The cross-linking agent is zirconium formate, aluminum acetate, aluminum citrate or aluminum formate; the clay stabilizer is potassium chloride, aluminum trichloride or polyepichlorohydrin dimethylamine.
The on-line compounding comprises the following steps:
A. pumping water into the stirring and mixing tank;
B. starting a stirrer in the stirring and mixing tank and self-circulation of liquid in the tank, and adding a clay stabilizer and a cross-linking agent into the stirring and mixing tank;
C. and continuously adding the polymer emulsion resistance reducing agent into the stirring and mixing tank, and stirring and mixing to obtain the resistance reducing type fracturing fluid.
The stirring and mixing tank is arranged in a double tank mode, and double-tank alternate mixing or double-tank simultaneous mixing is adopted during online mixing.
The resistance-reducing fracturing fluid is prepared by adopting the method.
A use method of the resistance-reducing fracturing fluid is characterized in that the resistance-reducing fracturing fluid prepared by the method is directly subjected to pump injection construction.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the invention provides a polymer emulsion resistance reducing agent for a resistance reducing fracturing fluid for oil fields, aiming at solving the problems of on-line mixing and viscosity regulation of the resistance reducing fracturing fluid, wherein an acrylamide monomer and sodium allylsulfonate are used in a matching way, and sodium allylsulfonate is used for replacing a conventional acrylic acid monomer, so that the polymerization reaction rate is slowed down, the phenomenon of implosion of the polymerization reaction is avoided, and the molecular weight of a polymerization product reaches more than 1400. Secondly, sodium allylsulfonate is used as a main chain monomer, and hydrophilic sulfonic acid groups are introduced, so that the polymer has higher water solubility. The sulfonic acid group in the molecular structure can enhance the anti-cationic precipitation capability of the high molecular polymer, further improve the salt resistance of the high molecular polymer, and solve the problem that the viscosity of the conventional polyacrylamide type additive for fracturing suddenly drops when meeting medium and high salinity formation water. Therefore, the prepared resistance-reducing fracturing fluid has good temperature resistance, still maintains good performance at the high temperature of 130 ℃, and can meet the performance requirement of deep high-temperature well fracturing fluid.
(2) When the polymer emulsion resistance reducing agent is prepared, the linear polyacrylamide main chain molecule side group hydrophobic group can be introduced by using the methoxy polyethylene glycol acrylate so as to improve the shearing resistance of a polymer chain. Meanwhile, the adopted tert-butyl acrylamide sulfonic acid is a salt-resistant monomer, so that the salt resistance of the polymer can be further improved.
(3) When the aqueous phase is prepared, the pH value of the system is adjusted to 6.5-7 by adopting NaOH, the neutralization with acid tert-butyl acrylamide sulfonic acid is facilitated, the partial neutrality of the mixed solution is maintained, the acrylamide can be prevented from being hydrolyzed into acrylic acid in a partial acid or partial alkali environment, the acrylic acid content is increased, the acrylamide content is reduced, the polymerization efficiency is reduced, and the long polyacrylamide chain generated by polymerization can be prevented from being curled and shrunk in a residual acid environment.
(3) The resistance-reducing fracturing fluid provided by the invention can be prepared and pumped by adopting a stirring and mixing tank in an online mixing mode on a construction site, water can be taken nearby, the convention that the fracturing fluid is prepared firstly and then transported is broken, the polymer emulsion resistance reducing agent, the cross-linking agent and the clay stabilizer are directly pumped and constructed after being mixed and stirred with clear water in proportion, the construction is carried out while the preparation is carried out in the using process, the fluid preparation process is simple, the use is convenient, and the cost is low.
(4) The resistance reducing rate of the fracturing fluid can reach more than 70 percent, the maximum resistance reducing rate reaches 75.8 percent, the frictional resistance of the fluid of the fracturing fluid under high shear rate is effectively reduced, the pump efficiency is greatly improved, and the construction requirement of large discharge capacity is met.
Drawings
FIG. 1 is a schematic view of the configuration of a stirring and mixing tank (double tank).
FIG. 2 is a top view of the blender mix tank (twin tank).
Figure 3 is a graph of the shear rate of the fracturing fluid versus the apparent viscosity of example 4.
Figure 4 is a plot of fracturing fluid flow rate versus drag reduction in example 4.
Figure 5 is a graph of the shear rate of the fracturing fluid versus the apparent viscosity of example 5.
Figure 6 is a plot of fracturing fluid flow rate versus drag reduction in example 5.
FIG. 7 is a graph of the shear rate of the fracturing fluid versus apparent viscosity of example 6.
Figure 8 is a plot of fracturing fluid flow rate versus drag reduction in example 6.
In fig. 1 and 2, a-1-stirring and mixing tank 1, a-2-stirring and mixing tank 2, J-1-stirrer 1, J-2-stirrer 2, D-1-feed inlet 1, D-2-feed inlet 2, F-1-valve 1, F-2-valve 2, F-3-valve 3, F-4-valve 4, F-5-valve 5, F-6-valve 6, F-7-valve 7, F0-inlet valve, Fi-1-outlet valve 1, Fi-2-outlet valve 2, G-centrifugal pump, G-1-centrifugal pump 1, G-2-centrifugal pump 2, G-3-centrifugal pump 3, G-4-centrifugal pump 4, and P-control box.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
Example 1: polymer emulsion resistance reducing agent I
Respectively adding petroleum ether and sodium dodecyl benzene sulfonate in a weight ratio of 95: 5 into a three-neck flask, heating to 36 ℃, fully stirring at a rotating speed of 300r/min, and uniformly mixing and dispersing the petroleum ether and the sodium dodecyl benzene sulfonate to obtain an oil phase A. According to the acrylamide monomer: sodium allyl sulfonate: methoxy polyethylene glycol acrylate: tert-butyl acrylamide sulfonic acid: deionized water 15: 7.5: 8: dissolving acrylamide monomer, sodium allylsulfonate, methoxypolyethylene glycol acrylate and tert-butyl acrylamide sulfonic acid in deionized water at a weight ratio of 1.5: 68, and adjusting the pH value of the system to 6.5 by using NaOH to prepare a water phase B. According to the oil phase A: slowly adding the water phase B into the oil phase A at a volume ratio of 1: 0.8, and fully stirring to fully emulsify the water phase to obtain the emulsion. Then introducing high-purity nitrogen to remove oxygen in the system for 10 min; then sodium sulfite is dripped, after 5 hours of polymerization reaction, the mixture is cooled to room temperature (about 25 ℃) by a constant temperature water bath kettle, and the stable polymer emulsion resistance reducing agent I is obtained.
Example 2: polymer emulsion resistance reducing agent II
Respectively adding n-hexane and sodium dodecyl sulfate in a weight ratio of 9.5: 6.5 into a three-neck flask, heating to 40 ℃, fully stirring at a rotating speed of 450r/min, and uniformly mixing and dispersing the two to obtain the oil phase A. According to the acrylamide monomer: sodium allyl sulfonate: methoxy polyethylene glycol acrylate: tert-butyl acrylamide sulfonic acid: deionized water 16.5: 8.5: 9: dissolving acrylamide monomer, sodium allylsulfonate, methoxy polyethylene glycol acrylate and tert-butyl acrylamide sulfonic acid in deionized water at a weight ratio of 2: 64, and adjusting the pH value of the system to 7 by using NaOH to prepare a water phase B. According to the oil phase A: slowly adding the water phase B into the oil phase A at a volume ratio of 1: 0.9, and fully stirring to emulsify the water phase to obtain the emulsion. Then introducing high-purity nitrogen to remove oxygen in the system for 12 min; and then ammonium persulfate is dropwise added, and after 5.5 hours of polymerization reaction, the mixture is cooled to room temperature (about 25 ℃) by using a constant-temperature water bath kettle, thus obtaining the stable polymer emulsion resistance reducing agent II.
Example 3: polymer emulsion resistance reducing agent III
Adding petroleum ether and sodium didodecylphenyl ether disulfonate in a weight ratio of 92: 8 into a three-neck flask respectively, heating to 45 ℃, and fully stirring at a rotating speed of 600r/min to uniformly mix and disperse the petroleum ether and the sodium didodecylphenyl ether disulfonate to obtain an oil phase A. According to the acrylamide monomer: sodium allyl sulfonate: methoxy polyethylene glycol acrylate: tert-butyl acrylamide sulfonic acid: deionized water 18: 9.5: 11: dissolving acrylamide monomer, sodium allylsulfonate, methoxypolyethylene glycol acrylate and tert-butyl acrylamide sulfonic acid in deionized water at a weight ratio of 2.5: 59, and adjusting the pH value of the system to 7 by using NaOH to prepare a water phase B. According to the oil phase A: slowly adding the water phase B into the oil phase A at a volume ratio of 1 to (0.8-0.95), and stirring to emulsify the water phase to obtain emulsion. Then introducing high-purity nitrogen to remove oxygen in the system for 15 min; then sodium sulfite is added dropwise, after 5.5h of polymerization reaction, the mixture is cooled to room temperature (about 25 ℃) by a constant temperature water bath kettle, and the stable polymer emulsion resistance reducing agent III is obtained.
Example 4: online mixed resistance-reducing fracturing fluid I
The polymer emulsion resistance reducing agent I prepared in example 1, water, potassium chloride and aluminum citrate are used as raw materials, and a stirring and mixing tank (double tanks) shown in figures 1 and 2 is adopted to prepare the resistance reducing fracturing fluid I through online mixing, wherein the specific method is as follows:
firstly, an inlet valve is opened, an outlet valve 1(Fi-1) is closed, a valve 1(F-1) is closed, a valve 3(F-3) is closed, a valve 4(F-4) is opened, a centrifugal pump 1(G-1) is opened, and a certain amount of clear water is pumped into a stirring and mixing tank 1 (A-1).
After the pump is filled with clear water, the centrifugal pump 1(G-1) is closed, the valve 1(F-1) is opened, the valve 6(F-6) is opened, the stirrer 1(J-1) is opened, the centrifugal pump 3(G-1) is opened, the liquid in the tank starts to self-circulate, and quantitative cross-linking agent and clay stabilizer are put into the tank through the feed opening 1(D-1) to form base liquid.
According to the liquid consumption and viscosity requirements of the pad fluid, the sand carrying fluid and the displacing fluid designed by fracturing fluid construction, polymer emulsion resistance reducing agents with different proportions are added to realize online viscosity adjustment of the fracturing fluid, meet the liquid performances of the pad fluid, the sand carrying fluid and the displacing fluid in the fracturing process, and finally prepare the resistance reducing type fracturing fluid I. In the resistance-reducing fracturing fluid I, the polymer emulsion resistance-reducing agent I is 0.6 percent, the potassium chloride is 0.5 percent, the aluminum citrate is 0.4 percent, and the balance is water by mass percent.
After the stirring and mixing tank 1 is mixed into the resistance-reducing fracturing fluid I, the valve 6(F-6) is closed, the outlet valve 1(Fi-1) is opened, and the pump injection construction is directly carried out.
In a specific construction process, the stirring and mixing tank 1(A-1) and the stirring and mixing tank 2(A-2) shown in the figures 1 and 2 can be put into use according to the requirement of construction liquid amount, double-tank alternate mixing or double-tank simultaneous mixing is realized through valve control, of course, in other possible construction processes, double-tank independent liquid mixing can be carried out, liquids with different performances are mixed, or the double tanks are communicated to prepare the same liquid, so that the requirement of actual construction liquid amount is met.
The influence of the shear rate on the apparent viscosity of the fracturing fluid system of the embodiment is measured by adopting a SARM type rheometer for the resistance-reducing fracturing fluid I of the embodiment at a certain shear rate, the test temperature is 25 ℃, and the change range of the shear rate is 10-170s-1. The test results are shown in FIG. 3. As can be seen from FIG. 3, as the shear rate increases, the apparent viscosity of the fracturing fluid system of the embodiment decreases dramatically, and finally the apparent viscosity tends to be stable, so that the fracturing fluid belongs to a non-Newtonian fluid which becomes thin by shear, and meets the requirement of the rheological property of the fracturing fluid.
An indoor pipeline friction resistance detector (with an inner diameter of 0.8cm and a length of 10m) and a drag reducer indoor evaluation device are adopted to test the drag reduction rate of the fracturing fluid system of the embodiment at different flow rates, and the test result is shown in fig. 4. As can be seen from FIG. 4, when the flow velocity of the fluid of this embodiment is gradually increased, the drag reduction rate thereof gradually increases to reach a maximum value of 73.2%, and finally, the fluid tends to be smooth and has an obvious drag reduction effect.
Example 5: online mixed resistance-reducing fracturing fluid II
In this embodiment, the equipment and the same online mixing manner are adopted as in embodiment 4 to prepare the resistance-reducing fracturing fluid ii, the using method is the same, and the difference is that: in the resistance-reducing fracturing fluid II, the polymer emulsion resistance-reducing agent II is 0.4 percent, the potassium chloride is 0.3 percent, the zirconium formate is 0.25 percent and the balance is water by mass percent.
The resistance-reducing fracturing fluid II of the embodiment is measured by adopting an SARM type rheometer at a certain shear rateThe influence of the fixed shear rate on the apparent viscosity of the fracturing fluid system of the embodiment is that the test temperature is 25 ℃, and the change range of the shear rate is 10-170s-1. The test results are shown in FIG. 5. As can be seen from FIG. 5, as the shear rate increases, the apparent viscosity of the fracturing fluid system of the embodiment decreases dramatically, and finally the apparent viscosity tends to be stable, so that the fracturing fluid belongs to a non-Newtonian fluid which becomes shear-thinning and meets the requirement of the rheological property of the fracturing fluid.
An indoor pipeline friction resistance detector (with an inner diameter of 0.8cm and a length of 10m) and a drag reducer indoor evaluation device are adopted to test the drag reduction rate of the fracturing fluid system of the embodiment at different flow rates, and the test result is shown in fig. 6. As can be seen from FIG. 6, when the flow velocity of the fluid of this embodiment is gradually increased, the drag reduction rate thereof gradually increases to reach a maximum value of 72.1%, and finally, the fluid tends to be smooth and has an obvious drag reduction effect.
Example 6: on-line mixed resistance-reducing fracturing fluid III
In this embodiment, the same equipment and the same online mixing manner are adopted as those in embodiment 4 to prepare the resistance-reducing fracturing fluid iii, the using method is the same, and the difference is that: in the resistance-reducing fracturing fluid III, the polymer emulsion resistance-reducing agent III is 0.2 percent, the aluminum trichloride is 0.1 percent, the aluminum acetate is 0.15 percent and the balance is water by mass percent.
The influence of the shear rate on the apparent viscosity of the fracturing fluid system of the embodiment is measured by adopting a SARM type rheometer for the resistance-reducing fracturing fluid III of the embodiment at a certain shear rate, the test temperature is 25 ℃, and the change range of the shear rate is 10-170s-1. The test results are shown in FIG. 7. As can be seen from FIG. 7, as the shear rate increases, the apparent viscosity of the fracturing fluid system of the embodiment decreases dramatically, and finally the apparent viscosity tends to be stable, so that the fracturing fluid belongs to a non-Newtonian fluid which becomes shear-thinning and meets the requirement of the rheological property of the fracturing fluid.
An indoor pipeline friction resistance detector (with an inner diameter of 0.8cm and a length of 10m) is adopted, and a drag reducer indoor evaluation device is used for testing the drag reduction rate of the fracturing fluid system of the embodiment at different flow rates, and the test result is shown in fig. 8. As can be seen from FIG. 8, when the flow velocity of the fluid of this embodiment is gradually increased, the drag reduction rate thereof gradually increases to reach a maximum value of 75.8%, and finally, the fluid tends to be smooth and has an obvious drag reduction effect.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (10)
1. A preparation method of a viscosity-reducing agent capable of on-line mixing and viscosity adjustment is characterized by comprising the following steps: the method comprises the following steps:
s1, stirring solvent oil and an anionic emulsifier in a weight ratio of (92-95) to (5-8) at the rotating speed of 300-;
s2, dissolving an acrylamide monomer, sodium allylsulfonate, methoxypolyethylene glycol acrylate and tert-butylacrylamide sulfonic acid in deionized water, and adjusting the pH value of the system to 6.5-7 by using NaOH to prepare a water phase B, wherein the weight ratio of the acrylamide monomer, the sodium allylsulfonate, the methoxypolyethylene glycol acrylate, the tert-butylacrylamide sulfonic acid to the deionized water is (15-18) to (7.5-9.5) to (8-11) to (1.5-2.5) to (59-68);
s3, according to the oil phase A: slowly adding the water phase B into the oil phase A according to the volume ratio of 1 to (0.8-0.95), fully stirring and emulsifying to obtain emulsion, introducing nitrogen to remove oxygen in the system for 10-15min, dripping an initiator, carrying out polymerization reaction for 5-5.5h, and cooling to room temperature to obtain the polymer emulsion resistance reducing agent.
2. The preparation method of the viscosity-reducing agent capable of being mixed and blended on line according to claim 1, wherein the preparation method comprises the following steps: in the step S1, the solvent oil is petroleum ether, n-hexane, cyclohexane or white oil; the anionic emulsifier is sodium dodecyl benzene sulfonate, sodium didodecyl phenyl ether disulfonate or sodium dodecyl sulfate.
3. The preparation method of the viscosity-reducing agent capable of being mixed and blended on line according to claim 1, wherein the preparation method comprises the following steps: in the step S3, the initiator is sodium sulfite, ammonium persulfate or sodium persulfate.
4. The resistance reducing agent capable of mixing and adjusting viscosity on line is characterized in that: prepared by the method of claim 1.
5. A preparation method of a resistance-reducing fracturing fluid is characterized by comprising the following steps: adopting a stirring and mixing tank to mix the polymer emulsion resistance reducing agent of claim 4 with clay stabilizer, cross-linking agent and water on line to prepare the resistance reducing fracturing fluid, wherein the resistance reducing fracturing fluid comprises the following components in percentage by mass,
the polymer emulsion resistance reducing agent is 0.2-0.6%;
clay stabilizer 0.1-0.5%;
0.15 to 0.4 percent of cross-linking agent;
the balance being water.
6. The preparation method of the resistance-reducing fracturing fluid as claimed in claim 5, wherein the preparation method comprises the following steps: the cross-linking agent is zirconium formate, aluminum acetate, aluminum citrate or aluminum formate; the clay stabilizer is potassium chloride, aluminum trichloride or polyepichlorohydrin dimethylamine.
7. The preparation method of the resistance-reducing fracturing fluid as claimed in claim 5, wherein the preparation method comprises the following steps: the on-line compounding comprises the following steps:
A. pumping water into the stirring and mixing tank;
B. starting a stirrer in the stirring and mixing tank and self-circulation of liquid in the tank, and adding a clay stabilizer and a cross-linking agent into the stirring and mixing tank;
C. and continuously adding the polymer emulsion resistance reducing agent into the stirring and mixing tank, and stirring and mixing to obtain the resistance reducing type fracturing fluid.
8. The preparation method of the resistance-reducing fracturing fluid as claimed in claim 7, wherein the preparation method comprises the following steps: the stirring and mixing tank is arranged in a double tank mode, and double-tank alternate mixing or double-tank simultaneous mixing is adopted during online mixing.
9. The resistance-reducing fracturing fluid is characterized in that: prepared by the method of any one of claims 5 to 8.
10. A use method of a resistance-reducing fracturing fluid is characterized by comprising the following steps: the resistance-reducing fracturing fluid prepared according to the method of claim 9 is directly pumped and injected for construction.
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