CN113563511A - Preparation method of multifunctional integrated fracturing fluid - Google Patents
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Abstract
The invention discloses a preparation method of multifunctional integrated fracturing fluid, which relates to the technical field of yield increase of petroleum and natural gas and comprises the following steps: adding the oil phase solution into a reactor, placing the reactor in a constant-temperature water bath kettle, starting a stirrer, and slowly adding the water phase solution into the reactor to prepare a water-in-oil inverse emulsion base solution; the aqueous phase solution comprises a nonionic monomer, an anionic monomer, a functional monomer, a water-soluble functional auxiliary agent, inorganic salt and deionized water; the oil phase solution comprises white oil, a compound emulsifier and an oil-soluble functional auxiliary agent; introducing nitrogen into the water-in-oil inverse emulsion base solution, stirring at a high speed, adding an initiator into the reactor, and uniformly stirring; continuously reacting in a sealed reactor to obtain a target product; the fracturing fluid prepared by the method can realize the integration of drag reduction and sand carrying, and has the functions of scale inhibition, emulsification prevention, oil displacement and drainage assistance and the like.
Description
Technical Field
The invention relates to the technical field of yield increase of petroleum and natural gas, in particular to a preparation method of a multifunctional integrated fracturing fluid.
Background
Along with the continuous deepening of exploration and development and the increasing demand for energy, the development strength of unconventional oil and gas resources in China is gradually improved, the unconventional oil and gas resources in China mainly comprise compact sandstone gas, coal bed gas, shale oil, shale gas and the like, the oil and gas reservoir has the characteristics of low porosity and low permeability and high pressure and low permeability, a horizontal well drilling technology and a volume fracturing technology are adopted in the current production practice, and the contact area of an oil layer and an oil and gas circulation channel are increased to the maximum extent.
The slickwater fracturing fluid is widely applied to unconventional fracturing construction due to the properties of low viscosity and low friction resistance. However, when the existing slickwater fracturing fluid is applied on site, the emulsion product is hydrated, and then the required functional auxiliary agent is added, so that the construction time is increased, and construction supporting equipment is also increased, so that the site construction process is complicated, the operation is inconvenient, and the construction cost is increased.
A large amount of fracturing fluid is injected into stratum, oil-water emulsification can generate a Jamin effect, the emulsion can block cracks and cause damage to the stratum, backflow of the fracturing fluid is seriously hindered, and yield reduction is caused to influence the yield increasing effect after pressing. Therefore, if the fracturing fluid has the emulsification prevention effect, the Jamin effect can be prevented, and the yield-increasing fracturing effect is improved.
The injection discharge capacity required by the transformation and fracturing of a compact oil layer is large, the water source shortage of a common oil storage area in China is short, return drainage needs to be repeatedly used under many conditions, the water hardness and the content of some insoluble impurities become higher and higher correspondingly, particularly divalent calcium, magnesium and barium ions react with sulfate radicals and carbonate anions in water to generate scale along with the increase of the concentration, and damage is caused to the permeability of a reservoir and the flow conductivity of cracks. Meanwhile, the scale is enriched on the surface of the pipeline, so that the corrosion of the metal pipeline is accelerated, the equipment loss is increased, and the economic cost loss is caused. So the scale inhibition function of the fracturing fluid is particularly important.
Meanwhile, if the fracturing fluid has an oil displacement function, after entering an oil layer along a crack or a thick pore throat and other relatively high-permeability channels, the fracturing fluid enters a thin pore throat under the action of capillary force to displace crude oil, and simultaneously, the wettability of reservoir rock is changed, and the oil-water interfacial tension is reduced or eliminated, so that the pressure reduction and the injection increase are realized, the crude oil is stripped from the surface of the rock, and the yield of the crude oil is improved.
Disclosure of Invention
The invention aims to provide a preparation method of multifunctional integrated fracturing fluid aiming at the defects in the prior art.
The technical scheme of the invention is as follows: a preparation method of multifunctional integrated fracturing fluid comprises the following steps:
the method comprises the following steps: preparation of the inverse emulsion base fluid
Uniformly mixing a nonionic monomer, an anionic monomer, a functional monomer, a water-soluble functional auxiliary agent, inorganic salt and deionized water in proportion to prepare an aqueous phase solution;
mixing white oil, compound emulsifier and oil-soluble functional auxiliary agent uniformly to prepare oil phase solution;
adding the oil phase solution into a reactor, placing the reactor in a constant-temperature water bath kettle, starting a stirrer, and slowly adding the water phase solution into the reactor to prepare a water-in-oil inverse emulsion base solution; the temperature of the constant-temperature water bath is controlled to be 30-50 ℃;
the aqueous phase solution comprises 15-20 parts by weight of nonionic monomer, 10-15 parts by weight of anionic monomer, 0.02-2 parts by weight of functional monomer, 0.5-1.5 parts by weight of water-soluble functional auxiliary agent, 0.5-5 parts by weight of inorganic salt and 40-55 parts by weight of deionized water; the oil phase solution comprises 15-17 parts by weight of white oil, 1-6 parts by weight of compound emulsifier and 0.5-2 parts by weight of oil-soluble functional auxiliary agent;
wherein the non-ionic monomer comprises one or more of acrylamide, methacrylamide, N-ethylacrylamide, N-dimethylacrylamide, N-diethylacrylamide and N, N-vinyl-propionamide; the anionic monomer comprises one or more of acrylic acid, methacrylic acid, itaconic acid, sodium allylsulfonate, sodium vinyl sulfonate and 2-acrylamide-2-methylpropanesulfonic acid; the functional monomer comprises one or more of dodecyl acrylate, tetradecyl acrylate, hexadecyl acrylate, octadecyl acrylate, N-dodecyl acrylamide, N-tetradecyl acrylamide, N-hexadecyl acrylamide, N-octadecyl acrylamide, dodecyl alcohol ether acrylate and tetradecyl alcohol ether acrylate;
step two:
introducing nitrogen into the water-in-oil inverse emulsion base solution and stirring for 20-40 minutes, and then adding an initiator into the reactor and uniformly stirring; the reactor is sealed and continuously reacted for 3 to 4 hours to prepare the target product.
Preferably, the water-soluble functional assistant comprises one or more of polyacrylate, polyacrylate-allyl dilute sulfonate copolymer, polyacrylate-acrylamide copolymer, hexamethylenediamine tetramethylene phosphonic acid and diethylenetriamine pentamethylene phosphonic acid.
Preferably, the inorganic salt comprises one or more of potassium chloride, sodium chloride, potassium sulfate, ammonium chloride, sodium hydroxide and potassium carbonate.
Preferably, the compound emulsifier comprises two or more of tween 60, tween 80, span 80 and OP-10.
Preferably, the oil-soluble functional auxiliary agent comprises one or more of alkoxy resin, polyol ether, polyamine ether and dioxygen compound.
Preferably, the addition amount of the initiator in the second step is 0.25-0.4% of the weight of the base fluid of the water-in-oil inverse emulsion.
Compared with the prior art, the invention has the following advantages:
the emulsion product prepared by the method is single homogeneous liquid, has good temperature resistance and freeze-thaw resistance, can realize the integration of drag reduction and sand carrying by the prepared fracturing fluid, and has the functions of scale inhibition, emulsification prevention, oil displacement and drainage assistance and the like; the fracturing fluid prepared by the method is clean and environment-friendly, has no damage to the formation permeability, has high dissolution speed and simple on-site liquid preparation, and can realize on-site continuous liquid preparation construction.
Drawings
FIG. 1 is a plot of the drag reduction test of example one;
FIG. 2 is a temperature-resistant shear-resistant performance test shear curve of the first embodiment.
Detailed Description
The invention is further illustrated below with reference to the figures and examples.
Example one
Weighing respectively: 10g of acrylic acid, 26g of 2-acrylamide-2-methylpropanesulfonic acid, 24g of acrylamide, 2g of N-dodecylacrylamide, 2g of hexamethylenediamine tetramethylenephosphonic acid, 6g of ammonium chloride, 90g of deionized water, 32g of white oil, 602 g of tween, 804 g of tween, 2g of vinyltrimethoxysilane, 0.04g of ammonium persulfate and 0.6g of sodium bisulfite.
The synthesis steps are as follows: mixing and stirring acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, acrylamide, N-dodecyl acrylamide, hexamethylenediamine tetramethylene phosphonic acid, ammonium chloride and deionized water uniformly to prepare an aqueous phase solution; mixing white oil, tween 60, tween 80 and vinyltrimethoxysilane uniformly to prepare an oil phase solution; placing the oil phase solution into a 300ml three-neck flask, and placing the three-neck flask into a water bath at 40 ℃; slowly adding the aqueous phase solution into a three-neck flask under rapid stirring to fully emulsify the aqueous phase solution to prepare water-in-oil inverse emulsion base solution; introducing nitrogen into the base liquid, and stirring at a high speed to remove oxygen; after stirring for 30 minutes, firstly adding ammonium persulfate and stirring uniformly, and then adding sodium bisulfite and stirring uniformly; and (3) sealing the three-neck flask, and continuously reacting for more than 3 hours to obtain the multifunctional integrated fracturing fluid.
And (3) carrying out performance test on the prepared fracturing fluid, wherein the test result is as follows:
(1) stability test
The prepared fracturing fluid samples are poured into sample bottles and are placed at room temperature for different times to observe the stability of the samples, and the results are shown in the following table 1:
TABLE 1
(2) Drag reduction test
Respectively preparing multifunctional integrated fracturing fluid solutions with the mass percentages of 0.1%, 0.2%, 0.3%, 0.4% and 0.6%, and measuring the drag reduction rates of the prepared fracturing fluids with different concentrations on a drag reduction rate testing device with the pipe diameter of 4.6mm and the flow rate of 18.6 m/s; FIG. 1 is a drag reduction test curve, and it can be obtained from FIG. 1 that the wide concentration range of the fracturing fluid can keep the drag reduction constant, and the drag reduction of slickwater can not be greatly reduced while the viscosity or sand carrying capacity of the fluid is increased.
(3) Temperature and shear resistance detection
Preparing a 1.5% fracturing fluid solution, and shearing at 120 ℃ at a shear rate of 170s < -1 > for 2 hours. The shear curve is shown in FIG. 2, with a final viscosity of 42 mPas. Under the normal condition, the viscosity of the non-crosslinked fracturing fluid is kept above 30 mpas after the temperature resistance and shear resistance test, and the fracturing fluid prepared by the method has excellent temperature resistance and shear resistance.
Compared with the similar products, the multifunctional integrated fracturing fluid provided by the embodiment has the following advantages:
(1) the multifunctional sand-carrying drag reduction and scale inhibition sand-carrying drag reduction and scale inhibition functions are integrated;
(2) the method is clean and environment-friendly, and has no damage to the formation permeability;
(3) the dissolution speed is high, the on-site liquid preparation is simple, and the on-site continuous liquid preparation construction can be realized.
Example two
Weighing respectively: 12g of methacrylic acid, 24g of 2-acrylamide-2-methylpropanesulfonic acid, 24g of acrylamide, 2g of dodecyl acrylate, 2g of hexamethylenediamine tetramethylene phosphonic acid, 6g of ammonium chloride, 90g of deionized water, 32g of white oil, 602 g of tween, 804 g of tween, 2g of vinyltrimethoxysilane, 0.04g of ammonium persulfate and 0.6g of sodium bisulfite.
The synthesis steps are as follows: mixing and stirring methacrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, acrylamide, dodecyl acrylate, hexamethylenediamine tetramethylene phosphonic acid, ammonium chloride and deionized water uniformly to prepare an aqueous phase solution; mixing white oil, tween 60, tween 80 and vinyltrimethoxysilane uniformly to prepare an oil phase solution; placing the oil phase solution into a 300ml three-neck flask, and placing the three-neck flask into a water bath at 30 ℃; slowly adding the aqueous phase solution into a three-neck flask under rapid stirring to fully emulsify the aqueous phase solution to prepare water-in-oil inverse emulsion base solution; introducing nitrogen into the base liquid, and stirring at a high speed to remove oxygen; stirring for 20 minutes, adding ammonium persulfate, stirring uniformly, then adding sodium bisulfite, and stirring uniformly; and (4) sealing the three-neck flask, and continuously reacting for 4 hours to obtain the multifunctional integrated fracturing fluid.
The performance test of the prepared fracturing fluid is basically equivalent to that of the embodiment, the stability is good, and the resistance reducing sand carrying performance and the temperature and shear resistance are excellent.
EXAMPLE III
Weighing respectively: 35g of itaconic acid, 52g of methacrylamide, 0.07g of tetradecyl acrylate, 1.75g of polyacrylate, 1.75g of potassium sulfate, 140g of deionized water, 52g of white oil, 602 g of tween, 801.5 g of tween, 1.75g of vinyltrimethoxysilane, 0.1g of ammonium persulfate and 0.6g of sodium bisulfite.
The synthesis steps are as follows: mixing itaconic acid, methacrylamide, tetradecyl acrylate, polyacrylate, potassium sulfate and deionized water, and stirring to obtain an aqueous solution; mixing white oil, tween 60, tween 80 and vinyltrimethoxysilane uniformly to prepare an oil phase solution; placing the oil phase solution into a three-neck flask, and placing the three-neck flask into a water bath at 50 ℃; slowly adding the aqueous phase solution into a three-neck flask under rapid stirring to fully emulsify the aqueous phase solution to prepare water-in-oil inverse emulsion base solution; introducing nitrogen into the base liquid, and stirring at a high speed to remove oxygen; after stirring for 40 minutes, firstly adding ammonium persulfate and stirring uniformly, and then adding sodium bisulfite and stirring uniformly; and (3) sealing the three-neck flask, and continuously reacting for 3 hours to obtain the multifunctional integrated fracturing fluid.
The performance test of the prepared fracturing fluid is basically equivalent to that of the embodiment, and the fracturing fluid has good stability, good resistance reduction, sand carrying, temperature resistance and shear resistance.
Example four
Weighing respectively: 10g of itaconic acid, 10g of 2-acrylamide-2-methylpropanesulfonic acid, 26.67g of N, N-dimethylacrylamide, 2.67g of tetradecyl acrylate, 2g of polyacrylate, 6.67g of potassium sulfate, 73g of deionized water, 22.67g of white oil, 604 g of Tween, 804 g of Tween, 2.67g of vinyltrimethoxysilane, 0.04g of ammonium persulfate and 0.66g of sodium bisulfite.
The synthesis steps are as follows: mixing itaconic acid, 2-acrylamide-2-methylpropanesulfonic acid, N-dimethylacrylamide, tetradecyl acrylate, polyacrylate, potassium sulfate and deionized water, and uniformly stirring to prepare an aqueous phase solution; mixing white oil, tween 60, tween 80 and vinyltrimethoxysilane uniformly to prepare an oil phase solution; placing the oil phase solution into a 300ml three-neck flask, and placing the three-neck flask into a water bath at 40 ℃; slowly adding the aqueous phase solution into a three-neck flask under rapid stirring to fully emulsify the aqueous phase solution to prepare water-in-oil inverse emulsion base solution; introducing nitrogen into the base liquid, and stirring at a high speed to remove oxygen; after stirring for 30 minutes, firstly adding ammonium persulfate and stirring uniformly, and then adding sodium bisulfite and stirring uniformly; and (3) sealing the three-neck flask, and continuously reacting for more than 3 hours to obtain the multifunctional integrated fracturing fluid.
The prepared fracturing fluid is subjected to performance test, and has good stability, good resistance reducing, sand carrying, temperature resistance and shear resistance.
EXAMPLE five
Weighing respectively: 13g of sodium vinyl sulfonate, 22g of 2-acrylamide-2-methylpropanesulfonic acid, 26g of N-methacrylamide, 2g of N-octadecylacrylamide, 2g of polyacrylate-acrylamide copolymer, 6g of potassium sulfate, 90g of deionized water, 32g of white oil, 602 g of tween, 804 g of tween, 2g of vinyl trimethoxy silane, 0.04g of ammonium persulfate and 0.6g of sodium bisulfite.
The synthesis steps are as follows: mixing and stirring sodium vinylsulfonate, 2-acrylamide-2-methylpropanesulfonic acid, N-methacrylamide, N-octadecyl acrylamide, polyacrylate-acrylamide copolymer, potassium sulfate and deionized water uniformly to prepare an aqueous phase solution; mixing white oil, tween 60, tween 80 and vinyltrimethoxysilane uniformly to prepare an oil phase solution; placing the oil phase solution into a 300ml three-neck flask, and placing the three-neck flask into a water bath at 35 ℃; slowly adding the aqueous phase solution into a three-neck flask under rapid stirring to fully emulsify the aqueous phase solution to prepare water-in-oil inverse emulsion base solution; introducing nitrogen into the base liquid, and stirring at a high speed to remove oxygen; after stirring for 30 minutes, firstly adding ammonium persulfate and stirring uniformly, and then adding sodium bisulfite and stirring uniformly; and (3) sealing the three-neck flask, and continuously reacting for more than 3 hours to obtain the multifunctional integrated fracturing fluid.
The performance test of the prepared fracturing fluid is basically equivalent to that of the embodiment, the stability is good, and the resistance reducing sand carrying performance and the temperature and shear resistance are excellent.
The present invention is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention, and the contents of the changes still fall within the scope of the present invention.
Claims (6)
1. The preparation method of the multifunctional integrated fracturing fluid is characterized by comprising the following steps of:
the method comprises the following steps: preparation of the inverse emulsion base fluid
Uniformly mixing a nonionic monomer, an anionic monomer, a functional monomer, a water-soluble functional auxiliary agent, inorganic salt and deionized water in proportion to prepare an aqueous phase solution;
mixing white oil, compound emulsifier and oil-soluble functional auxiliary agent uniformly to prepare oil phase solution;
adding the oil phase solution into a reactor, placing the reactor in a constant-temperature water bath kettle, starting a stirrer, and slowly adding the water phase solution into the reactor to prepare a water-in-oil inverse emulsion base solution; the temperature of the constant-temperature water bath is controlled to be 30-50 ℃;
the aqueous phase solution comprises 15-20 parts by weight of nonionic monomer, 10-15 parts by weight of anionic monomer, 0.02-2 parts by weight of functional monomer, 0.5-1.5 parts by weight of water-soluble functional auxiliary agent, 0.5-5 parts by weight of inorganic salt and 40-55 parts by weight of deionized water; the oil phase solution comprises 15-17 parts by weight of white oil, 1-6 parts by weight of compound emulsifier and 0.5-2 parts by weight of oil-soluble functional auxiliary agent;
wherein the non-ionic monomer comprises one or more of acrylamide, methacrylamide, N-ethylacrylamide, N-dimethylacrylamide, N-diethylacrylamide and N, N-vinyl-propionamide; the anionic monomer comprises one or more of acrylic acid, methacrylic acid, itaconic acid, sodium allylsulfonate, sodium vinyl sulfonate and 2-acrylamide-2-methylpropanesulfonic acid; the functional monomer comprises one or more of dodecyl acrylate, tetradecyl acrylate, hexadecyl acrylate, octadecyl acrylate, N-dodecyl acrylamide, N-tetradecyl acrylamide, N-hexadecyl acrylamide, N-octadecyl acrylamide, dodecyl alcohol ether acrylate and tetradecyl alcohol ether acrylate;
step two:
introducing nitrogen into the water-in-oil inverse emulsion base solution and stirring for 20-40 minutes, and then adding an initiator into the reactor and uniformly stirring; the reactor is sealed and continuously reacted for 3 to 4 hours to prepare the target product.
2. The preparation method of the multifunctional integrated fracturing fluid as claimed in claim 1, wherein the preparation method comprises the following steps: the water-soluble functional auxiliary agent comprises one or more of polyacrylate, polyacrylate-allyl dilute sulfonate copolymer, polyacrylate-acrylamide copolymer, hexamethylenediamine tetramethylene phosphonic acid and diethylenetriamine pentamethylene phosphonic acid.
3. The preparation method of the multifunctional integrated fracturing fluid as claimed in claim 1, wherein the preparation method comprises the following steps: the inorganic salt comprises one or more of potassium chloride, sodium chloride, potassium sulfate, ammonium chloride, sodium hydroxide and potassium carbonate.
4. The preparation method of the multifunctional integrated fracturing fluid as claimed in claim 1, wherein the preparation method comprises the following steps: the compound emulsifier comprises two or more of Tween 60, Tween 80, span 80 and OP-10.
5. The preparation method of the multifunctional integrated fracturing fluid as claimed in claim 1, wherein the preparation method comprises the following steps: the oil-soluble functional auxiliary agent comprises one or more of alkoxy resin, polyol ether, polyamine ether and a dioxygen compound.
6. The preparation method of the multifunctional integrated fracturing fluid as claimed in claim 1, wherein the preparation method comprises the following steps: and in the second step, the addition amount of the initiator is 0.25-0.4% of the weight of the base fluid of the water-in-oil inverse emulsion.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113896818A (en) * | 2021-11-17 | 2022-01-07 | 上海启赟新材料有限公司 | Emulsifier and PVB resin production method using same |
| CN115197365A (en) * | 2022-09-16 | 2022-10-18 | 江苏恒峰精细化学股份有限公司 | Preparation method of polyacrylamide emulsion |
| CN115725290A (en) * | 2022-11-01 | 2023-03-03 | 中国石油天然气股份有限公司 | Slickwater system for carbonate-containing oil and gas reservoir transformation and preparation and application thereof |
| CN116200183A (en) * | 2023-03-02 | 2023-06-02 | 四川申和新材料科技有限公司 | High-efficiency variable-viscosity fracturing fluid for deep coal bed gas development and integrated construction method |
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| CN113896818A (en) * | 2021-11-17 | 2022-01-07 | 上海启赟新材料有限公司 | Emulsifier and PVB resin production method using same |
| CN115197365A (en) * | 2022-09-16 | 2022-10-18 | 江苏恒峰精细化学股份有限公司 | Preparation method of polyacrylamide emulsion |
| CN115725290A (en) * | 2022-11-01 | 2023-03-03 | 中国石油天然气股份有限公司 | Slickwater system for carbonate-containing oil and gas reservoir transformation and preparation and application thereof |
| CN116200183A (en) * | 2023-03-02 | 2023-06-02 | 四川申和新材料科技有限公司 | High-efficiency variable-viscosity fracturing fluid for deep coal bed gas development and integrated construction method |
| CN116200183B (en) * | 2023-03-02 | 2024-05-28 | 四川申和新材料科技有限公司 | High-efficiency variable-viscosity fracturing fluid for deep coal bed gas development and integrated construction method |
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