CN110591012A - Water-soluble hyperbranched polymer thickened oil viscosity reducer and preparation method thereof - Google Patents
Water-soluble hyperbranched polymer thickened oil viscosity reducer and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a water-soluble hyperbranched polymer thickened oil viscosity reducer and a preparation method thereof, wherein the viscosity reducer is prepared by carrying out free radical polymerization reaction on 0.1-0.5% of functionalized skeleton monomer, 10-20% of acrylamide, 35-45% of modified nonionic polyoxyethylene ether and 40-50% of anionic monomer sodium olefin sulfonate in an aqueous solution at the temperature of 45-60 ℃. The polymer thickened oil viscosity reducer can be quickly dissolved in water, has strong temperature resistance and salt resistance, has good mixing and emulsifying performance with crude oil, has the emulsifying viscosity reduction rate of thickened oil with medium and low viscosity of more than 85 percent, and is easy to demulsify. Meanwhile, the raw materials for preparing the polymer thickened oil viscosity reducer are wide in source, and the preparation process of the viscosity reducer is simple and convenient.
Description
Technical Field
The invention belongs to the technical field of water-soluble polymer synthesis and heavy oil reservoir viscosity reduction, and particularly relates to a water-soluble hyperbranched polymer heavy oil viscosity reducer and a preparation method thereof.
Background
In recent years, with the increasing demand for energy in all countries of the world, the number of easy-to-develop high-permeability conventional oil reservoirs is smaller and smaller worldwide, and the heavy oil reservoirs attract more and more attention of petroleum workers. In China, an oil reservoir with crude oil viscosity of more than 50mPa · s under stratum conditions is generally defined as a heavy oil reservoir. With continuous exploitation of high-quality crude oil, the proportion of the heavy oil in the resource composition of China is gradually increased, but the thick oil is rich in colloid, asphaltene and long-chain paraffin, has high viscosity and high density, and causes the mobility of the crude oil in a reservoir and a shaft to be poor. If the colloid and the asphaltene can be effectively dispersed in the oil, the viscosity of the thick oil can be obviously reduced.
The viscosity reducing method for thick oil is roughly classified into a physical viscosity reducing method and a chemical viscosity reducing method according to the viscosity reducing principle. The physical viscosity reduction method is to reduce the viscosity of the thickened oil by a physical method (such as dilution, heating, ultrasonic wave and the like). The chemical viscosity-reducing method is a method of reducing the viscosity of thick oil by adding chemicals (viscosity-reducing agents) into the thick oil, and is divided into an oil-soluble viscosity-reducing technology and a water-soluble emulsifying viscosity-reducing technology according to the type and mechanism of the viscosity-reducing agents. Compared with other viscosity reducing technologies, the water-soluble emulsifying viscosity reducing technology has a relatively wide application range, a good viscosity reducing effect and a long viscosity reducing effective period; meanwhile, the process is simple, the cost is low, and the energy consumption is low; the viscosity of the thickened oil is reduced by using the oil reducing agent, and certain advantages are achieved.
The viscosity of the thickened oil is reduced by a water-soluble emulsification viscosity reduction technology, namely, the thickened oil on the surface of a rock can be dispersed and stripped under the shearing action of a stratum by adding a water-soluble micromolecule surfactant, the interfacial tension of oil and water is reduced, and a stable O/W type emulsion is formed, so that the viscosity of crude oil is reduced. However, due to the severe heterogeneity of the stratum, the aqueous solution with the surfactant can more easily act on the thickened oil in a high-permeability layer, so that the viscosity reduction coverage is limited, more crude oil in medium-low permeability layers cannot be used, and the single-component small-molecule surfactant is small in range of applicable oil reservoir conditions and poor in temperature and salt tolerance. Therefore, a chemical viscosity-reducing oil displacement agent which can reduce the oil-water interfacial tension and the crude oil viscosity, improve the oil washing efficiency, reduce the water-oil fluidity ratio, improve the sweep efficiency, and has wide application range and good performance is needed.
At present, it is one of the trends in development to synthesize a high molecular polymer heavy oil viscosity reducer by using different types of surfactants in a proper ratio. The high molecular polymer thickened oil viscosity reducer can reduce the interfacial tension of oil and water, and has advantages in both emulsibility and dispersibility; by introducing the specifically modified functional group into the molecular chain of the viscosity reducer, the viscosity reducer has good salt resistance and temperature resistance, has the compounding effect of various surfactants, avoids the chromatographic separation phenomenon existing in the compounding of the viscosity reducer, and has good viscosity reducing effect and wide application range; in addition, the spatial structure of the polymer in the aqueous solution adsorbs and retains in the stratum, and the coverage of the viscosity reducer action is expanded.
Chinese patent document CN 108822252A discloses an amphiphilic macromolecular thick oil activator and application thereof, wherein acrylamide, acrylic acid-alkali metal, maleic anhydride and dimethyl allyl dodecyl ammonium chloride are introduced on a dendritic unsaturated functional monomer, so that when the concentration of the activator is higher than 600mg/L, the viscosity reduction rate of thick oil is higher than 80%, and when the concentration is higher than 1200mg/L, the viscosity reduction rate of thick oil is higher than 89.6%, but the reaction needs to be carried out at low temperature (4 ℃, 5 ℃ or 6 ℃) and needs to be carried out for more than 6 hours. Chinese patent document CN104140507A discloses an acrylamide water-soluble polymer containing super-long hydrophobic long-chain modification and a preparation method thereof, wherein amphoteric monomer methacryloyloxyethyl-N, N-Dimethylpropanesulfonate (DMAPS), hydrophobic monomer docosyl polyoxyethylene ether methacrylate (BEM) and Acrylamide (AM) are copolymerized in water, the polymer has certain viscosity reduction capability, but a large amount of hydrophobic groups with long molecular chains exist in the polymer, so that the water solubility is poor. Chinese patent document CN103450868A discloses a temperature-resistant and salt-resistant water-soluble amphiphilic polymer composite thickened oil viscosity reducer, which is compounded by A, B two components; the component A is amphiphilic polymer formed by quaternary copolymerization of nonionic polyether acrylate and the like; the component B is a micromolecular surfactant; the viscosity reducing agent has the viscosity reducing rate of medium-low viscosity thickened oil of more than 95 percent, the viscosity reducing rate of medium-high ultrahigh viscosity thickened oil of more than 85 percent and good viscosity reducing effect; however, the raw materials used in the invention are more, the steps are complicated, and the coloring spectrum separation phenomenon exists in the compounding process, so that the synergistic effect is difficult to exert.
Disclosure of Invention
Aiming at the problems that the existing micromolecule thickened oil viscosity reducer has small range of applicable oil reservoir conditions and poor temperature and salt resistance, and the existing polymer thickened oil viscosity reducer has poor solubility and complicated synthesis or compounding steps, the invention provides the water-soluble hyperbranched polymer thickened oil viscosity reducer which has strong water solubility, can be rapidly dispersed in water, has good emulsification and viscosity reduction effects on thickened oil, is easy to demulsify emulsion, has a simple preparation process and wide raw material sources.
The water-soluble hyperbranched polymer thickened oil viscosity reducer provided by the invention is prepared by copolymerizing a functional skeleton monomer, acrylamide, a modified nonionic polyoxyethylene ether functional monomer and an anionic functional monomer,
(1) the structural formula of the functionalized framework monomer is shown as follows:
wherein R is1Represents 2.0 or 3.0 generation branched skeleton monomer polyamide-amine;
(2) the structural formula of the modified nonionic polyoxyethylene ether functional monomer is shown as follows:
wherein: n is1The number of polyoxyethylene groups in the nonionic surfactant polyoxyethylene ether is 8-15;
R2OH represents octyl phenol having 8 carbon atoms, nonyl phenol having 9 carbon atoms, or aliphatic alcohol having 12 carbon atoms;
(3) the anion functional monomer can be olefin sodium sulfonate;
the structural formula of the alkene sodium sulfonate is shown as follows:
wherein: n is2The number of the methylene group in the olefin sodium sulfonate is 14 to 16;
the structure of the water-soluble hyperbranched polymer thickened oil viscosity reducer is shown as the formula (I):
in the formula I, a, b, c and d represent the mass percent of the monomers (the total amount is 100%), wherein a can be 0.1-2.0%, b can be 30-50%, c can be 10-25%, and d can be 30-50%;
in the formula I, R1Represents 2.0 or 3.0 generation branched skeleton monomer polyamide-amine;
R2OH represents alkylphenol or fatty alcohol with 12 carbon atoms; the alkyl in the alkylphenol is an alkyl with 8 or 9 carbon atoms;
n1the number of polyoxyethylene groups in the nonionic surfactant polyoxyethylene ether is 8-15;
n2the number of the methylene group in the olefin sodium sulfonate is 14 to 16;
specifically, in the formula I, a can be 0.1-0.5%, b can be 35-45%, c can be 10-20%, and d can be 40-50% (by mass);
the invention also provides a method for preparing the water-soluble hyperbranched polymer thickened oil viscosity reducer, which comprises the following steps:
1) preparing the functionalized framework monomer, acrylamide, a modified nonionic polyoxyethylene ether functional monomer and an olefin sodium sulfonate monomer into an aqueous solution;
2) and adjusting the pH value of the aqueous solution to 6.0-7.0, and carrying out polymerization reaction in a redox initiation system under the protection of inert gas to obtain the polymer.
In the step 1) of the method, the concentration of the monomer in the aqueous solution can be 25 to 30 percent by mass;
in the step 2), the pH value of the aqueous solution can be adjusted to 6.0-7.0 by adding sodium hydroxide or sodium carbonate;
the inert gas can be specifically nitrogen;
the redox initiation system consists of an oxidizing agent and a reducing agent, wherein the oxidizing agent can be selected from one of ammonium persulfate and potassium persulfate, and the reducing agent can be selected from one of sodium bisulfite and potassium bisulfite;
the addition amount of the oxidant can be 0.01-0.025% of the total mass of the monomers, and the addition amount of the reducing agent can be 0.005-0.02% of the total mass of the monomers.
The temperature of the polymerization reaction can be 45-60 ℃, and the time can be 2-4 h.
The specific operation of the step 2) is as follows: adjusting the pH value of the aqueous solution to 6.0-7.0, and then introducing inert gas for protection for 40min in a water bath at the temperature of 45-60 ℃ and at a stirring speed of 250 r/min; then slowly dripping an oxidant, continuously stirring for 40min, slowly adding a reducing agent solution, stopping introducing nitrogen, and continuously stirring for polymerization reaction for 2.5-3 h; and finally, crushing and drying the gel generated by the reaction.
The application of the water-soluble hyperbranched polymer heavy oil viscosity reducer in heavy oil reservoir development also belongs to the protection scope of the invention.
The application can be specifically the application of the water-soluble hyperbranched polymer thickened oil viscosity reducer in thickened oil emulsification viscosity reduction.
According to the water-soluble hyperbranched polymer thickened oil viscosity reducer prepared by the invention, through experimental tests, the viscosity reducer can be quickly dissolved in water, is high in temperature resistance and salt tolerance, is high in mixing and emulsifying performance with crude oil, and the emulsifying viscosity reduction rate of thickened oil with medium and low viscosity is more than 85%.
The invention has the following technical characteristics and beneficial effects:
(1) the monomers polyamide-amine, acrylamide, nonionic polyoxyethylene ether and olefin sodium sulfonate used in the invention are all industrial products, and have wide sources and low cost.
(2) The monomers used in the invention are all easily soluble in water, are aqueous solution free radical polymerization reaction, can be polymerized in one step, and have simple synthesis steps.
(3) The modified nonionic surfactant and the anionic surfactant olefin sodium sulfonate used in the invention are not only easy to emulsify the thick oil, but also can dissolve and disperse the stacks of asphaltene and colloid in the thick oil by the benzene ring or long-chain alkyl at the tail end of the monomer molecular chain. Meanwhile, the nonionic surfactant has the advantage of easy demulsification after emulsification, and the anionic surfactant has stronger temperature resistance and salt tolerance, and is connected to a polyacrylamide molecular chain to play the synergistic effect of the anionic surfactant and the polyacrylamide molecular chain.
Drawings
FIG. 1 is a flow chart of the preparation of functionalized 2.0 backbone monomers of example 1 of the present invention.
FIG. 2 is a flow chart of the preparation of modified nonionic polyoxyethylene ether in example 1 of the present invention.
Detailed Description
The present invention will be described below with reference to specific examples, but the present invention is not limited thereto.
The experimental methods used in the following examples are all conventional methods unless otherwise specified; reagents, materials and the like used in the following examples are commercially available unless otherwise specified.
The viscosity reducer is prepared by copolymerizing functional skeleton monomers of polyamide-amine, acrylamide, modified nonionic polyoxyethylene ether and olefin sodium sulfonate, wherein the skeleton monomers of polyamide-amine and nonionic polyoxyethylene ether are industrial raw materials and are synthesized and modified by maleic anhydride, and the operation steps and the molecular structural formula are as follows:
example 1
(a) Functionalized modification of backbone monomers
Sequentially dissolving 2.0 generation or 3.0 generation framework monomers and maleic anhydride in a molar ratio of 1: 8 or 1: 16 in an N, N-dimethylformamide solvent with the mass ratio of 2-3 times; putting the system in ice water bath (below 10 deg.C), introducing nitrogen gas for 40min, stirring and dissolving completely; reacting for 6-7 h under the condition of normal temperature and light shielding; the modified functionalized skeleton monomer solution is added into chloroform, and milky white and light yellow powdery substances can be separated out, namely the relatively pure functionalized skeleton monomer.
Taking the modified 2.0 generation as an example, a flow chart of the preparation of the functionalized 2.0 framework monomer is shown in fig. 1.
The modified 2.0 generation polyamide-amine has a molecular structural formula shown as (1):
the modified 3.0 generation polyamide-amine has a molecular structural formula shown as (2):
(b) preparation of modified nonionic polyoxyethylene ether
Adding the dehydrated nonionic polyoxyethylene ether and maleic anhydride into a reaction vessel according to the proportion of 1: 1.2, selecting p-toluenesulfonic acid as a catalyst, adding 2.5 percent of p-toluenesulfonic acid, adding 0.1 percent of hydroquinone serving as a polymerization inhibitor, controlling the reaction temperature to be 95 ℃, and reacting for 3-4 hours to generate the nonionic alkylphenol polyoxyethylene ether maleic monoester.
The preparation flow chart is shown in figure 2.
The nonionic alkylphenol polyoxyethylene ether maleic acid monoester is shown as a formula 3:
wherein in the formula 3, n is the number of oxyethylene chain joints of 10-15, and m is the number of carbon atoms of 8-9;
modifying fatty alcohol-polyoxyethylene ether by using the same modification steps, wherein the modified fatty alcohol-polyoxyethylene ether maleic acid monoester is shown as a formula 4;
in the formula 4, n is the number of oxyethylene chain segments 9-15.
Example 2
The synthesis of the water-soluble hyperbranched thickened oil viscosity reducer adopts the following preferred scheme:
firstly, a certain amount of deionized water is put into a reaction vessel, and 0.4 percent of functionalized skeleton monomer 2.0 generation polyamide-amine, 14.5 percent of acrylamide, 40.1 percent of modified octylphenol polyoxyethylene ether maleic acid monoester (shown as a formula 3, wherein n is 10, m is 8) and 45 percent of olefin sodium sulfonate monomer (n is 10, m is 8) are added under the condition of normal temperature and 20 DEG C214-16, Chengdong chemical reagent factory, AOS liquid), and preparing a solution (mass fraction) with a monomer concentration of 25%;
secondly, adjusting the pH value of the solution to 6.5 by adding sodium hydroxide, and then introducing inert gas nitrogen for protection for 40min under the conditions of water bath heating at 45 ℃ and stirring speed of 250 r/min; then slowly dropping an ammonium persulfate solution, wherein the ammonium persulfate in the ammonium persulfate solution accounts for 0.01 percent of the total mass of the monomers, continuously stirring for 40min, slowly adding a sodium bisulfite solution, wherein the sodium bisulfite in the sodium bisulfite solution accounts for 0.007 percent of the total mass of the monomers, stopping introducing nitrogen, and continuously heating, stirring and polymerizing for 3 h; and finally, crushing and drying the gel generated by the reaction to obtain the powdery polymer viscosity reducer 1.
Example 3
The synthesis of the water-soluble hyperbranched thickened oil viscosity reducer adopts the following preferred scheme:
firstly, putting a certain amount of deionized water into a reaction container, and mixing and stirring 0.1% of functionalized skeleton monomer 3.0 generation polyamide-amine, 13.8% of acrylamide, 38.5% of modified nonylphenol polyoxyethylene ether maleic acid monoester (shown in formula 3, n is 10, m is 9) and 47.6% of olefin sodium sulfonate monomer uniformly at the normal temperature of 20 ℃ to prepare a solution (in mass fraction) with the monomer concentration of 25%;
secondly, adjusting the pH value of the solution to 6.7 by adding sodium carbonate, and then introducing inert gas nitrogen for protection for 40min under the conditions of water bath heating at 45 ℃ and stirring speed of 250 r/min; then slowly dropping an ammonium persulfate solution, wherein the ammonium persulfate in the ammonium persulfate solution accounts for 0.018 percent of the total mass of the monomers, continuously stirring for 40min, slowly adding a sodium bisulfite solution, wherein the sodium bisulfite in the sodium bisulfite solution accounts for 0.01 percent of the total mass of the monomers, stopping introducing nitrogen, and continuously heating, stirring and polymerizing for 3 h; and finally, crushing and drying the gel generated by the reaction to obtain the powdery polymer viscosity reducer 2.
Example 4
The synthesis of the water-soluble hyperbranched thickened oil viscosity reducer adopts the following preferred scheme:
firstly, putting a certain amount of deionized water into a reaction vessel, and mixing and stirring 0.4% of functionalized skeleton monomer 2.0 generation polyamide-amine, 14.6% of acrylamide, 42.3% of modified fatty alcohol-polyoxyethylene ether maleic acid monoester (shown in formula 4, wherein n is 9) and 42.7% of olefin sodium sulfonate monomer uniformly at the normal temperature of 20 ℃ to prepare a solution (in mass fraction) with the monomer concentration of 25%;
secondly, adjusting the pH value of the solution to 6.5 by adding sodium hydroxide, and then introducing inert gas nitrogen for protection for 40min under the conditions of water bath heating at 45 ℃ and stirring speed of 250 r/min; then slowly dropping an ammonium persulfate solution, wherein the ammonium persulfate in the ammonium persulfate solution accounts for 0.012 percent of the total mass of the monomers, continuously stirring for 40min, slowly adding a sodium bisulfite solution, wherein the sodium bisulfite in the sodium bisulfite solution accounts for 0.009 percent of the total mass of the monomers, stopping introducing nitrogen, and continuously heating, stirring and polymerizing for 3 h; and finally, crushing and drying the gel generated by the reaction to obtain the powdery polymer viscosity reducer 3.
Example 5
The synthesis of the water-soluble hyperbranched thickened oil viscosity reducer adopts the following preferred scheme:
firstly, a certain amount of deionized water is put into a reaction vessel, 0.1 percent of functionalized skeleton monomer 3.0 generation polyamide-amine, 13.8 percent of acrylamide, 38.5 percent of modified octylphenol polyoxyethylene ether maleic acid monoester (shown in formula 3, n is 15, m is 8) and 47.6 percent of olefin sodium sulfonate monomer are mixed and stirred uniformly under the condition of normal temperature and 20 ℃, and a solution (calculated by mass fraction) with the monomer concentration of 25 percent is prepared;
secondly, adjusting the pH value of the solution to 6.7 by adding sodium hydroxide or sodium carbonate, and introducing inert gas nitrogen for protection for 40min under the conditions of water bath heating at 45 ℃ and stirring speed of 250 r/min; then slowly dropping an ammonium persulfate solution, wherein the ammonium persulfate in the ammonium persulfate solution accounts for 0.018 percent of the total mass of the monomers, continuously stirring for 40min, slowly adding a sodium bisulfite solution, wherein the sodium bisulfite in the sodium bisulfite solution accounts for 0.01 percent of the total mass of the monomers, stopping introducing nitrogen, and continuously heating, stirring and polymerizing for 3 h; and finally, crushing and drying the gel generated by the reaction to obtain the powdery polymer viscosity reducer 4.
Example 6
The water-soluble hyperbranched polymer viscosity reducers 1, 2, 3 and 4 synthesized in the examples 2 to 5 are subjected to basic performance evaluation:
(1) dissolution time
According to SY/T5862-. Adjusting the speed of the vertical stirrer to (400 +/-20) r/min to enable water to form a vortex, slowly and uniformly scattering a sample into the vortex wall within 1min, and continuously stirring for 2h to obtain a mother solution with the mass fraction of 0.5%; picking up the mother liquor by a glass rod, and observing whether the solution is uniform by naked eyes; if the solution has no undissolved micelle or particle, the dissolution speed is judged to be less than or equal to 2.0 h.
And (3) mother liquor prepared from the water-soluble hyperbranched polymer viscosity reducers 1, 2, 3 and 4, wherein the solutions have no undissolved micelle or particle, and the dissolution speed of each viscosity reducer is judged to be less than or equal to 2.0 h.
(2) Viscosity reduction performance:
selecting two kinds of dehydrated crude oil of a certain oil field as an oil sample 1 and an oil sample 2, wherein the viscosities of the crude oil at 50 ℃ are 285mPa and 2173mPa & s respectively, and using the crude oil as viscosity reduction evaluation experiment oil; two types of surfactant monomers were tested as controls, and the procedure was as follows:
keeping the temperature of crude oil in a constant-temperature water bath at 50 +/-1 ℃ for 1h, stirring to remove free water and bubbles, and immediately measuring the viscosity mu at 50 +/-1 ℃ by using a rotary viscosity meter0(ii) a Preparing a mixture containing 3% NaCl and 0.3% CaCl2Preparing a solid sample into a solution with the mass fraction of 0.3% by using the saline solution for later use;
weighing 280g (accurate to 0.1g) of prepared thick oil sample into a beaker, adding 120g (accurate to 0.1g) of prepared viscosity reducer sample solution, putting the mixture into a constant-temperature water bath at (50 +/-1) DEG C, keeping the temperature for 1h, placing a stirring rod in the center of the beaker at a position (2-3) mm away from the bottom, adjusting the rotating speed to 250r/min, stirring for 2min under the constant temperature condition, immediately measuring the prepared thick oil emulsion by using a rotary viscometer, and measuring the viscosity mu at (50 +/-1) DEG C.
In the above formula (a): loop factor-viscosity reduction,%;
μ0viscosity of the thickened oil sample at-50 ℃, mpa · s;
mu-viscosity of the thick oil emulsion after adding the sample solution, mPa & s.
The viscosity reduction evaluation effects of the different types of hyperbranched amphiphilic polymer heavy oil viscosity reducers are shown in the following table.
(3) Stability of thick oil emulsion
The thick oil emulsion (total amount is 100mL) prepared above is prepared, the thick oil emulsion is moved into a clean and dry glass bottle with a plug and a ground opening, then the thick oil emulsion is placed in a water bath kettle at 50 ℃, the volume V (mL) of the water separated out is measured after the thick oil emulsion is observed every 5min, and the smaller the volume of the water separated out from the emulsion is, the more stable the emulsion is.
The viscosity reduction evaluation results and the emulsion stability results of the water-soluble hyperbranched polymer viscosity reducers synthesized in examples 2 to 5 are summarized in the following table:
from the above table, it can be seen that: the water-soluble hyperbranched polymer thickened oil viscosity reducer provided by the invention has different viscosity reducing rates for crude oil with different viscosities, but has good viscosity reducing effect, the viscosity reducing rates are all over 85%, and the emulsion is easy to break.
(4) Temperature resistance
Mixing the synthesized water-soluble hyperbranched polymer thickened oil viscosity reducer sample powder with 5000mg/L standard saline (NaCl: CaCl)2∶MgCl2·6H2O0.875: 0.075: 0.050) to obtain a solution with a concentration of 1500mg/L, placing the solution in a constant-temperature oven at 60 ℃, 80 ℃ and 100 ℃ for 24 hours, and then carrying out shearing at 65 ℃ and a shearing rate of 7.34s-1The viscosity reducing performance and the apparent viscosity change of the viscosity reducing agent solution are measured, and the loss of the viscosity reducing performance of the water-soluble hyperbranched polymer viscosity reducing agents 1, 2, 3 and 4 is less than 30%, and the apparent viscosities are all more than 70mPa & s.
(5) Salt resistance:
respectively preparing saline water with the sodium chloride concentration of 1000mg/L, 5000mg/L, 10000mg/L and 30000mg/L, wherein each saline water contains calcium chloride with the sodium chloride concentration of 10%, and respectively preparing a viscosity reducer solution with the mass concentration of 1500mg/L by using each saline water; at 65 ℃ and a shear rate of 7.34s-1Measuring viscosity reduction performance and apparent viscosity change of the viscosity reducer solution; the viscosity reducing performance loss of the water-soluble hyperbranched polymer viscosity reducers 1, 2, 3 and 4 is less than 20 percent, and the apparent viscosity is more than 100mPa & s.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (9)
1. A water-soluble hyperbranched polymer thickened oil viscosity reducer is prepared by copolymerizing a functional skeleton monomer, acrylamide, a modified nonionic polyoxyethylene ether functional monomer and an anionic functional monomer.
2. The water-soluble hyperbranched polymer thick oil viscosity reducer of claim 1, wherein:
the structural formula of the functionalized framework monomer is shown as follows:
wherein R is1Represents 2.0 or 3.0 generation branched skeleton monomer polyamide-amine;
the structural formula of the modified nonionic polyoxyethylene ether functional monomer is shown as follows:
wherein n is1Means notThe number of polyoxyethylene groups in the ionic surfactant polyoxyethylene ether is 8-15;
R2OH represents octyl phenol having 8 carbon atoms, nonyl phenol having 9 carbon atoms, or aliphatic alcohol having 12 carbon atoms;
the anion functional monomer is olefin sodium sulfonate;
the structural formula of the alkene sodium sulfonate is shown as follows:
wherein n is2The number of the methylene group in the olefin sulfonic acid sodium is 14 to 16.
3. The water-soluble hyperbranched polymer thick oil viscosity reducer of claim 2, wherein: the structure of the water-soluble hyperbranched polymer thickened oil viscosity reducer is shown as the formula (I):
in the formula I, a, b, c and d represent the mass percent of the monomers, wherein a is 0.1-2%, b is 30-50%, c is 10-25%, and d is 30-50%;
in the formula I, R1Represents 2.0 or 3.0 generation branched skeleton monomer polyamide-amine;
R2OH represents alkylphenol or fatty alcohol with 12 carbon atoms; the alkyl in the alkylphenol is an alkyl with 8 or 9 carbon atoms;
n1the number of polyoxyethylene groups in the nonionic surfactant polyoxyethylene ether is 8-15;
n2the number of the methylene group in the olefin sulfonic acid sodium is 14 to 16.
4. The water-soluble hyperbranched polymer thick oil viscosity reducer of any one of claims 1-3, wherein: in the formula I, a is 0.1-0.5%, b is 35-45%, c is 10-20%, and d is 40-50%.
5. A method of making the water soluble hyperbranched polymer thick oil viscosity reducer of any one of claims 1-4, comprising:
1) preparing a functional skeleton monomer, acrylamide, a modified nonionic polyoxyethylene ether functional monomer and an olefin sodium sulfonate monomer into an aqueous solution;
2) and adjusting the pH value of the aqueous solution to 6.0-7.0, and carrying out polymerization reaction in a redox initiation system under the protection of inert gas to obtain the polymer.
6. The method of claim 5, wherein: in the step 1), the concentration of the monomer in the aqueous solution is 25-30% by mass;
the redox initiation system consists of an oxidizing agent and a reducing agent, wherein the oxidizing agent is selected from one of ammonium persulfate and potassium persulfate, and the reducing agent is selected from one of sodium bisulfite and potassium bisulfite;
the addition amount of the oxidant is 0.01-0.025% of the total mass of the monomers, and the addition amount of the reducing agent can be 0.005-0.02% of the total mass of the monomers.
7. The method according to claim 5 or 6, characterized in that: the temperature of the polymerization reaction is 45-60 ℃, and the time is 2-4 h.
8. The use of the water-soluble hyperbranched polymer heavy oil viscosity reducer of any one of claims 1 to 4 in heavy oil reservoir development.
9. Use according to claim 8, characterized in that: the application is the application of the water-soluble hyperbranched polymer thickened oil viscosity reducer of any one of claims 1 to 4 in thickened oil emulsification viscosity reduction.
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