CN112210360B - Colloidal dispersion polymer system and preparation method thereof - Google Patents
Colloidal dispersion polymer system and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of oil exploitation, and particularly provides a colloidal dispersion polymer system and a preparation method thereof, wherein the preparation method comprises the following steps: 1) Preparing a composite tackifying assistant: adding a dispersant into dechlorinated tap water, and stirring to obtain a dispersant solution; under the condition of stirring, adding a crystallization agent into a dispersant solution, and continuously stirring to obtain a composite tackifying assistant; 2) Preparing a polymer solution: adding polymer dry powder into high-calcium-magnesium oilfield injection water, stirring until the polymer is fully dissolved, and filtering to remove insoluble substances to obtain a polymer solution; 3) And under the stirring condition, adding the composite tackifying assistant into the polymer solution, and stirring until flocs in the system are completely dispersed to obtain a colloid dispersed polymer system. The invention changes the interaction of calcium and magnesium ions and the polymer by adding the composite tackifying assistant, and inverts the viscosity reduction function of the calcium and magnesium ions into the tackifying function, so that the viscosity of the polymer system is greatly improved, uniform and stable.
Description
Technical Field
The invention belongs to the technical field of oil exploitation, and particularly relates to a colloidal dispersion polymer system and a preparation method thereof.
Background
The polymer flooding is an important chemical flooding enhanced recovery technology, and has been comprehensively and industrially applied to a class-II reservoir polymer flooding technology with the temperature less than 80 ℃, the mineralization degree less than 30000mg/L and the content of calcium and magnesium ions less than 400 mg/L. However, since the HPAM (partially hydrolyzed polyacrylamide) can undergo obvious molecular degradation under high temperature conditions, the viscosity of the oil deposit with high mineralization degree, particularly high content of calcium and magnesium ions, can be greatly reduced, even precipitation is generated to lose the oil displacement capability, and the application of the polymer flooding in high-temperature and high-salt oil deposit is greatly limited.
The study of the effect of calcium and magnesium ions on the viscosity of HPAM solutions shows that: ca 2+ And Mg 2+ Not only can be combined with carboxyl hydrolyzed by HPAM to reduce the viscosity of the solution, but also can be subjected to cross-linking reaction with carboxyl in HPAM molecules and among molecules, so that serious curling and intermolecular aggregation and even precipitation are generated in the molecules, and the tackifying capability of the solution is rapidly reduced; ca 2+ And Mg 2+ The effect on HPAM viscosity is much greater than that of Na + And K + The influence degree is about 8 to 25 times of that of univalent ions; ca in water to ensure better viscosity increasing 2+ The content should be controlled below 200mg/L, preferably below 100 mg/L; mg (Mg) 2+ The content should be controlled below 100mg/L, preferably below 50 mg/L.
Aiming at the problem of polymer tackifying under the condition of high calcium and magnesium ion content, a great deal of research is carried out at home and abroad, and the currently proposed technical methods mainly comprise the following two methods:
one is the synthesis and application of the heat-resistant salt-resistant acrylamide polymer: at present, the reported temperature-resistant salt-resistant polymers mainly comprise comb polymers, hydrophobic association polymers and multi-component copolymerization polymers, various novel temperature-resistant salt-resistant polymers have certain calcium and magnesium resistance, the tackifying performance of the novel temperature-resistant salt-resistant polymers is obviously superior to that of HPAM, but the problem of great reduction of viscosity still exists when the calcium and magnesium content exceeds a certain critical content. Cui Maolei, etc. have studied the viscosity of 3 temperature-resistant salt-resistant polymers (HPAM 3, KYPAM6 and NY 1) synthesized by the chemical research institute of Beijing, chinese petrochemistry along with the change of calcium ion content, and the study finds that the viscosity of the polymer solution is continuously reduced along with the increase of calcium content, and the reduction of viscosity is large when the calcium ion content is 200-400 mg/L and 600-800 mg/L, which indicates that the temperature-resistant salt-resistant polymer is still not suitable for being applied to high-calcium-magnesium oil reservoirs with calcium-magnesium content more than 600 mg/L.
The second is the viscosity increasing by removing calcium and magnesium with alkaline agent: adding weak base (Na) into the polymer solution 2 CO 3 Or NaHCO 3 ) The weak base and calcium and magnesium ions generate precipitation reaction to form solid-phase calcium and magnesium carbonate, the content of calcium and magnesium ions in the solution is reduced along with the precipitation reaction, the viscosity is increased, the content of calcium and magnesium ions in the solution can be reduced to be ultralow (below 200 mg/L) by controlling the addition amount of the weak base, and the obvious tackifying effect is realized. CN102162350B proposes a method for improving profile control effect of polymer solution by using calcium and magnesium ions in water, and the method adds a metered scale remover (NaOH and Na) into the polymer solution 2 CO 3 ) The influence of calcium and magnesium ions in the high-salinity solvent water on the viscosity of the polymer solution is eliminated, and the large pore channels or high-permeability strips of the oil reservoir rock are effectively plugged by using carbonate micro particles which are the reaction products of the detergent and the calcium and magnesium ions in the water. However, this method has significant drawbacks in field applications: after the carbonate solid-phase particles are formed, due to particle coalescence, crystal growth and flocculation of polymers, polymer-coated particle agglomerate precipitates or flocculent precipitates are often formed in the solution, which on one hand causes the loss of the polymers and on the other hand also easily blocks the injection well near-well stratum.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a colloidal dispersion polymer system and a preparation method thereof.
In a first aspect the present invention provides a method of preparing a colloidal dispersion polymer system, the method comprising the steps of:
1) Preparing a composite tackifying assistant: adding a dispersant into dechlorinated tap water, and stirring to obtain a dispersant solution; under the condition of stirring, adding a crystallization agent into a dispersant solution, and continuously stirring to obtain a composite tackifying assistant;
2) Preparing a polymer solution: adding polymer dry powder into high-calcium-magnesium oilfield injection water, stirring until the polymer is fully dissolved, and filtering to remove insoluble substances to obtain a polymer solution;
3) Under the condition of stirring, adding the composite tackifying assistant into the polymer solution, and stirring until flocs in the system are completely dispersed to obtain the colloid dispersed polymer system;
the dispersant is one or a mixture of more of homopolymer, copolymer, organic phosphonate and organic phosphonate dispersant; the crystallization agent is selected from NaOH and Na 2 CO 3 And NaHCO 3 At least one of (a); the polymer is an acrylamide polymer; the content of calcium and magnesium ions in the high-calcium and magnesium oilfield injection water is less than 3000mg/L.
In a second aspect, the present invention provides a colloidally dispersed polymer system obtainable by the above-described method of preparation.
The preparation method of the colloid dispersed polymer system has the following beneficial effects:
1. according to the invention, the composite tackifying assistant is prepared and added into a polymer solution prepared by utilizing oilfield injection water with high calcium and magnesium ion content, the composite tackifying assistant and the polymer are compounded to form a colloid dispersed polymer system, the interaction between calcium and magnesium ions and the polymer is changed by adding the composite tackifying assistant in the system, the viscosity reduction effect of the calcium and magnesium ions is promoted to be inverted into the tackifying effect, and the viscosity of the system is greatly improved by taking the viscosity reduction effect as a mechanism.
2. The preparation method of the invention is different from the ordinary method for removing calcium and magnesium and increasing viscosity by using an alkaline agent which takes the reduction of the viscosity of calcium and magnesium ions as a mechanism, the compound viscosity-increasing auxiliary agent method is a brand-new method for increasing the viscosity of the polymer, the polymer solution prepared by the novel method can achieve the purpose of greatly increasing the viscosity of the polymer under the condition of high calcium and magnesium ion content, and the viscosity-increasing range is obviously higher than that of the ordinary method for increasing the viscosity. The prepared polymer system is obviously higher than the viscosity of a polymer solution with the same concentration prepared by NaCl brine without the influence of calcium and magnesium ion viscosity reduction, and compared with the method of independently adding the components of the composite tackifying assistant into the polymer solution, the colloid-dispersed polymer system prepared by the method has better dispersibility, higher stability and higher viscosity.
3. The method is suitable for preparing colloid dispersed polymer systems of different types of polymers, the prepared polymer system is uniform and stable, has good filtering performance and reservoir injectivity, excellent tackifying performance, good thermal stability and temperature and calcium magnesium resistance, and is suitable for being applied to polymer flooding of high-temperature high-calcium magnesium oil reservoirs to improve the recovery ratio.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Detailed Description
In order that the present invention may be more readily understood, the following detailed description of the invention is given with reference to the accompanying embodiments, which are given by way of illustration only and are not intended to limit the invention.
In a first aspect the present invention provides a method of preparing a colloidal dispersion polymer system, the method comprising the steps of:
1) Preparing a composite tackifying assistant: adding a dispersant into dechlorinated tap water, and stirring to obtain a dispersant solution; adding a crystallization agent into the dispersant solution under the stirring condition, and continuously stirring to obtain a composite tackifying assistant;
2) Preparing a polymer solution: adding polymer dry powder into high-calcium-magnesium oilfield injection water, stirring until the polymer is fully dissolved, and filtering to remove insoluble substances to obtain a polymer solution;
3) Under the condition of stirring, adding the composite tackifying assistant into the polymer solution, and stirring until flocs in the system are completely dispersed to obtain the colloid dispersed polymer system;
the dispersant is one or more of homopolymer, copolymer, organic phosphonate and organic phosphonate dispersant; the crystallization agent is selected from NaOH and Na 2 CO 3 And NaHCO 3 At least one of (a); the polymer is an acrylamide polymer; the content of calcium and magnesium ions in the high-calcium and magnesium oilfield injection water is less than 3000mg/L.
Preferably, the homopolymer-based dispersant is selected from at least one of polyacrylic acid, polymethacrylic acid, polymaleic acid, polyaspartic acid (sodium), and polyepoxysuccinic acid.
Preferably, the copolymer-based dispersant is selected from at least one of acrylic acid-methyl acrylate copolymer, acrylic acid-maleic anhydride copolymer, acrylic acid-itaconic acid copolymer, acrylic acid-hydroxypropyl acrylate copolymer, acrylic acid-acrolein copolymer, styrene sulfonic acid-maleic anhydride copolymer, maleic acid-allyl alcohol copolymer, phosphinic acid-based polyacrylic acid, acrylic acid-hydroxyethyl methacrylate-methyl acrylate copolymer, acrylic acid-2-acrylamide-2-methylpropanesulfonic acid-phosphinic acid telomer, acrylic acid-hydroxypropyl acrylate-sodium phosphinate telomer, sodium lignosulfonate, sulfonate amido copolymer, amide copolymer, acrylic acid-sulfonate-amido copolymer, acrylic acid ester-phosphonic acid-sulfonate tetrapolymer, acrylic acid ester-sulfonate terpolymer, carboxylate-sulfonate-nonionic terpolymer, and carboxylate-sulfonate-acrylate terpolymer.
Preferably, the organophosphonate and organophosphonate dispersant is selected from at least one of aminotrimethylene phosphonic acid, ethylenediamine tetramethylene phosphonic acid, hydroxyethylene phosphonic acid, diethylenetriamine pentamethylene phosphonic acid, hexamethylenediamine tetramethylene phosphonic acid, 2-phosphonobutyl-1,2,4-tricarboxylic acid, polyol phosphates, and polyaminopolyether methylene phosphonic acid.
In the present invention, the acrylamide-based polymer may be a hydrophobically associating polymer, a comb-type polymer or a multipolymer, and optionally, the molecular chain thereof contains at least one of a sulfonic acid group, a carboxylic acid group, an amide group and a quaternary amine group. The specific compound may be chosen from hydrophobically associating polymers such as SP1205, S6030 from SNF, france, and AP-P4 from Photobiopolymer.
According to the present invention, the dechlorinated tap water may be prepared by a conventional method, and preferably, the dechlorinated tap water may be prepared by a method comprising: and (3) adding tap water into the reaction kettle, stirring for 2 hours, and then storing for more than 12 hours to obtain the chlorine-gas-removed tap water.
The compound tackifying assistant is compounded by a dispersant and a crystallization agent, and the compound formula is obtained through experimental research. The selection of the dispersing agent and the crystallizing agent, and the compound concentration can be obtained by the following analysis method: (1) Adding different types of dispersants (with the concentration of 0.2 wt%) into the polymer solution, and measuring the viscosity of the polymer solution at the oil storage temperature after fully stirring and mixing, wherein the dispersant with the viscosity retention rate of more than 90% is an alternative dispersant; (2) Adding different types of crystallization agents (the molar concentration is equivalent to calcium and magnesium ions) into the polymer solution added with the alternative dispersing agent, continuously stirring the compound solution until flocs are completely dispersed, measuring the viscosity of the polymer solution at the oil reservoir temperature, and selecting the combination of the dispersing agent and the crystallization agent with the best tackifying effect for preparing the composite tackifying assistant; (3) Evaluating the tackifying effects of the polymer solutions of the two composite tackifying assistant formula medicaments under different adding concentration conditions, and determining the reasonable adding concentrations of the two formula medicaments to form a composite tackifying assistant formula.
Based on the above research, the colloidal dispersion polymer system of the present invention has a polymer content of 1000 to 3000mg/L, a dispersant content of 0.05 to 1wt%, a crystallization agent content of 0.05 to 1wt%, and the balance being water.
Preferably, in the colloid dispersion polymer system, the content of the polymer is 1500-3000mg/L, the content of the dispersing agent is 0.1-0.3wt%, the content of the crystallization agent is 0.2-0.4wt%, and the balance is water.
Preferably, in the step 1), the concentration of the dispersing agent and the crystallization agent in the composite tackifying assistant is n times of the concentration in the colloid dispersed polymer system; in the step 3), the volume ratio of the polymer solution to the composite tackifying assistant is n-1: 1. The method is beneficial to controlling the contents of the dispersing agent and the crystallization agent.
In a second aspect, the present invention provides a colloidally dispersed polymer system obtainable by the above-described method of preparation.
The colloid dispersion polymer system prepared by the invention has uniform and stable system and good filtering performance and reservoir injectivity, solves the problems of flocculation and solid phase precipitation existing in the polymer solution prepared by an alkaline agent calcium and magnesium removal tackifying method, and also solves the problem that the near-well stratum is easy to block due to poor injectivity of the polymer solution prepared by the calcium and magnesium removal tackifying method. The novel colloid dispersion polymer system has excellent tackifying performance, and the viscosity increase amplitude breaks through the upper tackifying limit of the alkaline agent calcium and magnesium removal tackifying method. In addition, the novel colloid dispersion polymer system has good thermal stability and temperature resistance and calcium and magnesium resistance, the viscosity of the system is increased along with the increase of temperature and aging time, and the tackifying performance of the system is stable when the content of calcium and magnesium ions is not higher than 3000mg/L.
The present invention will be described in detail below with reference to examples.
Examples 1-4 serve to illustrate the colloidally dispersed polymer systems of the present invention and their method of preparation.
Example 1
A polymer flooding project is planned to be developed in a high water-cut period of a certain water injection development oil reservoir, the water quality of the oil reservoir injection sewage is 25g/L of total mineralization degree, the content of calcium and magnesium ions is 1200mg/L, and the oil reservoir temperature is 62 ℃.
A method of preparing a colloidal dispersion polymer system, the method comprising the steps of:
1) Preparing a composite tackifying assistant: adding a dispersing agent, namely ethylenediamine tetramethylene phosphonic acid sodium into dechlorinated tap water (adding tap water into a reaction kettle, stirring for 2 hours, then storing for more than 12 hours to obtain the dechlorinated tap water), adding the dispersing agent, namely ethylenediamine tetramethylene phosphonic acid sodium into the reaction kettle, stirring for 10 minutes to obtain a dispersing agent solution, wherein the concentration of the dechlorinated tap water is 2 wt%; under the condition of stirring, adding a crystallization agent Na 2 CO 3 Adding the mixture into a dispersant solution, adding the mixture into the dispersant solution with the concentration of 3wt%, and continuously stirring the mixture for 20 minutes to obtain a composite tackifying assistant;
2) Preparing a polymer solution: with simulated saline (TDS: 25g/L, ca) 2+ :1200 mg/L) as high calcium magnesium oilfield injection water to prepare 2000mg/L polymer (SP 1205) solution, adding polymer dry powder into simulated saline water, stirring until the polymer is fully dissolved, and filtering to remove insoluble substances to obtain polymer solution with viscosity of 15.0mPa & s at 62 ℃;
3) And adding the composite tackifying assistant into the polymer solution under the stirring condition, wherein the volume ratio of the composite tackifying assistant to the polymer solution is 1: 9, stirring for 15 minutes to completely disperse flocs in the system to obtain a colloid dispersed polymer system, wherein the viscosity of the system at 62 ℃ is 60.7mPa & s, which is 4 times of that of the pure polymer solution.
The colloidally dispersed polymer system was homogeneous and stable, with a viscosity 13.8 times the initial viscosity after 220 days of aging at 62 ℃.
Example 2
A polymer flooding project is planned to be developed in a high water-cut period of a certain water injection development oil reservoir, the water quality of the injected sewage of the oil reservoir is 25g/L of total mineralization degree, the content of calcium and magnesium ions is 1500mg/L, and the oil reservoir temperature is 62 ℃.
A method of preparing a colloidal dispersion polymer system, the method comprising the steps of:
1) Preparing a composite tackifying assistant: adding a dispersant polymethacrylic acid into dechlorinated tap water (tap water is added into a reaction kettle, stirred for 2 hours and then stored for more than 12 hours to obtain dechlorinated tap water), adding 1.5wt% of dispersant into the dechlorinated tap water, and stirring to obtain a dispersant solution; under the condition of stirring, a crystallization agent NaHCO is added 3 Adding the mixture into a dispersant solution, adding the mixture into the dispersant solution with the concentration of 2wt%, and continuously stirring to obtain a composite tackifying assistant;
2) Preparing a polymer solution: with simulated saline (TDS: 25g/L, ca) 2+ :1500 mg/L) as high calcium magnesium oilfield injection water to prepare 2000mg/L polymer (SP 1205) solution, adding polymer dry powder into simulated saline water, stirring until the polymer is fully dissolved, and filtering to remove insoluble substances to obtain polymer solution with viscosity of 16.8mPa & s at 62 ℃;
3) And adding the composite tackifying assistant into the polymer solution under the stirring condition, wherein the volume ratio of the composite tackifying assistant to the polymer solution is 1: 9, stirring for 15 minutes to completely disperse flocs in the system to obtain a colloid dispersed polymer system, wherein the viscosity of the system at 62 ℃ is 63.8mPa & s, which is 3.8 times of that of the pure polymer solution.
The colloidally dispersed polymer system was homogeneous and stable, with a viscosity of 11.5 times the initial viscosity after 220 days of aging at 62 ℃.
Example 3
A polymer flooding project is planned to be developed in a high water-cut period of a certain water injection development oil reservoir, the water quality of the injected sewage of the oil reservoir is 25g/L of total mineralization degree, the content of calcium and magnesium ions is 2000mg/L, and the oil reservoir temperature is 62 ℃.
A method of preparing a colloidal dispersion polymer system, the method comprising the steps of:
1) Preparing a composite tackifying assistant: adding a dispersant acrylic acid-maleic anhydride copolymer into dechlorination tap water (adding tap water into a reaction kettle, stirring for 2 hours, then storing for more than 12 hours to obtain the dechlorination tap water), adding 3wt% of the dispersant acrylic acid-maleic anhydride copolymer into the dechlorination tap water, and stirring to obtain a dispersant solution; under the condition of stirring, adding a crystallization agent NaOH into a dispersant solution, adding the solution with the concentration of 3wt%, and continuously stirring to obtain a composite tackifying auxiliary agent;
2) Preparing a polymer solution: with simulated saline (TDS: 25g/L, ca) 2+ :2000 mg/L) as high calcium magnesium oilfield injection water to prepare 2000mg/L polymer (SP 1205) solution, adding polymer dry powder into simulated saline water, stirring until the polymer is fully dissolved, and filtering to remove insoluble substances to obtain polymer solution with viscosity of 15.2mPa & s at 62 ℃;
3) And adding the composite tackifying assistant into the polymer solution under the stirring condition, wherein the volume ratio of the composite tackifying assistant to the polymer solution is 1: 9, stirring for 15 minutes to completely disperse flocs in the system to obtain a colloid dispersed polymer system, wherein the viscosity of the system at 62 ℃ is 68.4mPa & s, which is 4.5 times of the viscosity of the pure polymer solution.
The colloidally dispersed polymer system was homogeneous and stable, with a viscosity of 12.6 times the initial viscosity after 220 days of aging at 62 ℃.
Example 4
A polymer flooding project is planned to be developed in a high water-cut period of a certain water injection development oil reservoir, the water quality of the oil reservoir injection sewage is 25g/L of total mineralization degree, the content of calcium and magnesium ions is 1200mg/L, and the oil reservoir temperature is 62 ℃.
A method of preparing a colloidal dispersion polymer system, the method comprising the steps of:
1) Preparing a composite tackifying assistant: adding a dispersant polyalcohol phosphate into dechlorination tap water (adding tap water into a reaction kettle, stirring for 2 hours, and then storing for more than 12 hours to obtain the dechlorination tap water), adding the dispersant polyalcohol phosphate into the reaction kettle with the concentration of 2wt%, and stirring to obtain a dispersant solution; under the condition of stirring, adding a crystallization agent NaOH into a dispersant solution, adding the solution with the concentration of 3wt%, and continuously stirring to obtain a composite tackifying auxiliary agent;
2) Preparing a polymer solution: with simulated saline (TDS: 25g/L, ca) 2+ :2000 mg/L) as high calcium magnesium oilfield injection water to prepare 2000mg/L polymer (SP 1205) solution, adding polymer dry powder into simulated saline water, stirring until the polymer is fully dissolved, and filtering to remove insoluble substances to obtain polymer solution with viscosity of 16.3mPa & s at 62 ℃;
3) And adding the composite tackifying assistant into the polymer solution under the stirring condition, wherein the volume ratio of the composite tackifying assistant to the polymer solution is 1: 9, stirring for 15 minutes to completely disperse flocs in the system to obtain a colloid dispersed polymer system, wherein the viscosity of the system at 62 ℃ is 70.1mPa & s, which is 4.3 times of that of the pure polymer solution.
The colloidally dispersed polymer system was homogeneous and stable, with a viscosity 13.5 times the initial viscosity after 220 days of aging at 62 ℃.
Comparative example 1
A2000 mg/L solution of the polymer (SP 1205) was prepared using 25g/L NaCl brine, and had a viscosity of 24.0 mPas at 62 ℃.
The initial viscosity of the colloidally dispersed polymer system prepared in example 1 was 2.5 times the concentration of the NaCl saline formulated polymer solution.
Comparative example 2
A polymer flooding project is planned to be developed in a high water-cut period of a certain water injection development oil reservoir, the water quality of the oil reservoir injection sewage is 25g/L of total mineralization degree, the content of calcium and magnesium ions is 1200mg/L, and the oil reservoir temperature is 62 ℃.
A method of making a polymer system, the method comprising the steps of:
1) Preparing a polymer solution: with simulated saline (TDS: 25g/L, ca) 2+ :1200 mg/L) as high calcium magnesium oilfield injection water to prepare 2000mg/L polymer (SP 1205) solution, and adding polymer dry into simulated salt waterStirring the powder until the polymer is sufficiently dissolved, and filtering to remove insoluble substances to obtain a polymer solution having a viscosity of 15.0 mPas at 62 ℃;
2) Under the condition of stirring, the dispersing agent of sodium ethylene diamine tetra methylene phosphonate and the crystal forming agent of Na 2 CO 3 Adding the mixture into a polymer solution, wherein the adding concentration of a dispersing agent is 0.2wt%, the adding concentration of a crystallization agent is 0.3wt%, continuously stirring to obtain the polymer system, and the viscosity of the system is 38.5mPa & s at 62 ℃.
The colloidally dispersed polymer system was not homogeneous and its viscosity was 8.6 times the initial viscosity after 220 days of aging at 62 ℃.
Comparative example 3
In a high water-cut period of a certain water injection development oil reservoir, a polymer flooding project is planned to be developed, the water quality of sewage injected into the oil reservoir is 25g/L of total mineralization degree, the content of calcium and magnesium ions is 1500mg/L, and the temperature of the oil reservoir is 62 ℃.
A method of making a polymer system, the method comprising the steps of:
1) Preparing a polymer solution: with simulated saline (TDS: 25g/L, ca) 2+ :1500 mg/L) as high calcium magnesium oilfield injection water to prepare 2000mg/L polymer (SP 1205) solution, adding polymer dry powder into simulated saline water, stirring until the polymer is fully dissolved, and filtering to remove insoluble substances to obtain polymer solution with viscosity of 16.8mPa & s at 62 ℃;
2) Under the condition of stirring, the dispersant polymethacrylic acid and the crystallization agent NaHCO are added 3 Adding the mixture into a polymer solution, wherein the adding concentration of a dispersing agent is 0.15wt%, the adding concentration of a crystallization agent is 0.2wt%, continuously stirring to obtain the polymer system, and the viscosity of the system at 62 ℃ is 42.5mPa & s 。
The colloidally dispersed polymer system was not homogeneous and its viscosity was 9.3 times the initial viscosity after 220 days of aging at 62 ℃.
Comparing the data of the examples and the comparative examples, the colloidal dispersion polymer system prepared by the method has excellent tackifying performance, good thermal stability and heat resistance and calcium and magnesium resistance, the viscosity of the system increases along with the increase of temperature and aging time, and the tackifying performance of the system is stable when the content of calcium and magnesium ions is not higher than 3000mg/L. The viscosity of the colloidal dispersion polymer system of the invention is obviously higher than that of a polymer solution with the same concentration prepared by NaCl brine; compared with the method of directly adding the components of the composite tackifying assistant into the polymer solution, the colloid dispersed polymer system prepared by the method has better dispersibility, higher stability and higher viscosity.
The colloid dispersion polymer system prepared by the method has uniform and stable system and good filtering performance and reservoir injectivity, solves the problems of flocculation and solid phase precipitation existing in the polymer solution prepared by the alkali agent calcium and magnesium removal tackifying method, and also solves the problem that the near-well stratum is easy to block due to poor injectivity of the polymer solution prepared by the calcium and magnesium removal tackifying method.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the illustrated embodiments.
Claims (8)
1. A method of preparing a colloidal dispersion polymer system, comprising the steps of:
1) Preparing a composite tackifying assistant: adding a dispersant into dechlorinated tap water, and stirring to obtain a dispersant solution; under the condition of stirring, adding a crystallization agent into a dispersant solution, and continuously stirring to obtain a composite tackifying assistant; the preparation method of the dechlorinated tap water comprises the following steps: filling tap water into the reaction kettle, stirring for 2 hours, and then storing for more than 12 hours to obtain chlorine-gas-removed tap water;
2) Preparing a polymer solution: adding polymer dry powder into high-calcium-magnesium oil field injection water, stirring until the polymer is fully dissolved, and filtering to remove insoluble substances to obtain a polymer solution;
3) Under the condition of stirring, adding the composite tackifying assistant into the polymer solution, and stirring until flocs in the system are completely dispersed to obtain the colloid dispersed polymer system;
the dispersant is a homopolymer or copolymerOne or more mixtures of polymers, organic phosphonates and organic phosphonate dispersants; the crystallization agent is selected from NaOH and Na 2 CO 3 And NaHCO 3 At least one of; the polymer is an acrylamide polymer; the content of calcium and magnesium ions in the high-calcium and magnesium oilfield injection water is less than 3000mg/L;
in the step 1), the concentration of the dispersing agent and the crystallization agent in the composite tackifying assistant is n times of the concentration in the colloid dispersed polymer system; in the step 3), the volume ratio of the polymer solution to the composite tackifying assistant is n-1: 1.
2. The production method according to claim 1, wherein the homopolymer-based dispersant is selected from at least one of polyacrylic acid, polymethacrylic acid, polymaleic acid, polyaspartic acid (sodium), and polyepoxysuccinic acid.
3. The preparation method according to claim 1, wherein the copolymer-based dispersant is selected from at least one of acrylic acid-methyl acrylate copolymer, acrylic acid-maleic anhydride copolymer, acrylic acid-itaconic acid copolymer, acrylic acid-hydroxypropyl acrylate copolymer, acrylic acid-acrolein copolymer, styrene sulfonic acid-maleic anhydride copolymer, maleic acid-allyl alcohol copolymer, phosphinic acid-based polyacrylic acid, acrylic acid-hydroxyethyl methacrylate-methyl acrylate copolymer, acrylic acid-2-acrylamide-2-methylpropanesulfonic acid-phosphinic acid telomer, acrylic acid-hydroxypropyl acrylate-sodium phosphinate telomer, sodium lignosulfonate, sulfonate amido copolymer, acrylic acid-sulfonate-amido copolymer, acrylic acid-acrylate-phosphonic acid-sulfonate tetrapolymer, acrylic acid-acrylate-sulfonate terpolymer, carboxylate-sulfonate-nonionic terpolymer, and carboxylate-sulfonate-acrylate terpolymer.
4. The process of claim 1 wherein the organophosphonate and organophosphonate dispersant is selected from at least one of aminotrimethylene phosphonic acid, ethylenediamine tetramethylene phosphonic acid, hydroxyethylene phosphonic acid, diethylenetriamine pentamethylene phosphonic acid, hexamethylenediamine tetramethylene phosphonic acid, 2-phosphonobutyl-1,2,4-tricarboxylic acid, polyol phosphate and polyaminopolyether methylene phosphonic acid.
5. The production method according to claim 1, wherein the acrylamide-based polymer is a hydrophobically associative polymer, a comb-type polymer or a multipolymer, and optionally, at least one of a sulfonic acid group, a carboxylic acid group, an amide group and a quaternary amine group is contained in a molecular chain thereof.
6. The method of claim 1 wherein the polymer is present in an amount of 1000 to 3000mg/L, the dispersant is present in an amount of 0.05 to 1wt%, the crystallization agent is present in an amount of 0.05 to 1wt%, and the balance is water.
7. The method of claim 6, wherein the polymer is present in an amount of 1500 to 3000mg/L, the dispersant is present in an amount of 0.1 to 0.3wt%, the crystallization agent is present in an amount of 0.2 to 0.4wt%, and the balance is water.
8. A colloidally dispersed polymer system obtainable by the method of manufacture of any one of claims 1 to 7.
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