CN113929816A - High-strength profile control agent and preparation method thereof - Google Patents
High-strength profile control agent and preparation method thereof Download PDFInfo
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- CN113929816A CN113929816A CN202111403510.XA CN202111403510A CN113929816A CN 113929816 A CN113929816 A CN 113929816A CN 202111403510 A CN202111403510 A CN 202111403510A CN 113929816 A CN113929816 A CN 113929816A
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- 238000002360 preparation method Methods 0.000 title abstract description 10
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 73
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 49
- 239000008367 deionised water Substances 0.000 claims abstract description 22
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 22
- 239000000440 bentonite Substances 0.000 claims abstract description 20
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 20
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 20
- NVLHKSGUMYMKRR-UHFFFAOYSA-N dodeca-2,10-dienediamide Chemical group NC(=O)C=CCCCCCCC=CC(N)=O NVLHKSGUMYMKRR-UHFFFAOYSA-N 0.000 claims abstract description 20
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims abstract description 16
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 16
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 16
- 239000003999 initiator Substances 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical group [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 42
- 239000000725 suspension Substances 0.000 claims description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 239000011259 mixed solution Substances 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- LXEKPEMOWBOYRF-UHFFFAOYSA-N [2-[(1-azaniumyl-1-imino-2-methylpropan-2-yl)diazenyl]-2-methylpropanimidoyl]azanium;dichloride Chemical compound Cl.Cl.NC(=N)C(C)(C)N=NC(C)(C)C(N)=N LXEKPEMOWBOYRF-UHFFFAOYSA-N 0.000 claims description 2
- 238000000034 method Methods 0.000 claims 1
- 238000010521 absorption reaction Methods 0.000 abstract description 25
- 229910010272 inorganic material Inorganic materials 0.000 abstract description 5
- 239000011147 inorganic material Substances 0.000 abstract description 5
- 239000003921 oil Substances 0.000 abstract description 4
- 238000013329 compounding Methods 0.000 abstract description 3
- 239000010779 crude oil Substances 0.000 abstract description 2
- 239000011368 organic material Substances 0.000 abstract description 2
- 238000011084 recovery Methods 0.000 abstract description 2
- 238000006116 polymerization reaction Methods 0.000 description 27
- 238000002347 injection Methods 0.000 description 11
- 239000007924 injection Substances 0.000 description 11
- 239000000243 solution Substances 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 239000003129 oil well Substances 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 4
- 229920006037 cross link polymer Polymers 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000007863 gel particle Substances 0.000 description 4
- 238000002329 infrared spectrum Methods 0.000 description 4
- 239000003607 modifier Substances 0.000 description 4
- 239000006004 Quartz sand Substances 0.000 description 3
- 238000000862 absorption spectrum Methods 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000011203 carbon fibre reinforced carbon Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 230000000977 initiatory effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- ZIUHHBKFKCYYJD-UHFFFAOYSA-N n,n'-methylenebisacrylamide Chemical compound C=CC(=O)NCNC(=O)C=C ZIUHHBKFKCYYJD-UHFFFAOYSA-N 0.000 description 2
- 239000003002 pH adjusting agent Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 238000004566 IR spectroscopy Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- -1 aluminum ions Chemical class 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 229910001430 chromium ion Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000012844 infrared spectroscopy analysis Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 125000000325 methylidene group Chemical group [H]C([H])=* 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 150000003140 primary amides Chemical class 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 150000003334 secondary amides Chemical class 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000001845 vibrational spectrum Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/56—Acrylamide; Methacrylamide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/44—Polymerisation in the presence of compounding ingredients, e.g. plasticisers, dyestuffs, fillers
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
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- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
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- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
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Abstract
The invention relates to the technical field of oil field crude oil recovery improvement, and discloses a high-strength profile control agent and a preparation method thereof. The raw material components of the profile control agent comprise: acrylic acid, acrylamide, bentonite, a pH regulator, a cross-linking agent, an initiator and deionized water; wherein the cross-linking agent is hexamethylene bisacrylamide. According to the invention, hexamethylene bisacrylamide is used as a cross-linking agent, so that the water absorption expansion multiple of the plugging agent is increased, and the plugging strength of the plugging agent is improved; the plugging strength of the plugging agent is improved by adopting a mode of compounding organic and inorganic materials.
Description
Technical Field
The invention relates to the technical field of oil field crude oil recovery enhancement, in particular to a high-strength profile control agent and a preparation method thereof.
Background
After the water injection development oil field enters a medium-high water content period, the dominant seepage channel of the reservoir develops, injected water flows to the oil well along the dominant seepage channel, the water yield of the oil well is increased, the oil yield is reduced, and therefore the profile control of the water injection well and the water shutoff of the oil well need to be carried out by adopting the profile control agent.
The prior plugging agent mainly comprises crosslinked polymer gel, pre-crosslinked gel particles and the like. The cross-linked polymer gel is prepared by adding cross-linking agents such as phenolic resin, chromium ions, aluminum ions and the like into a polymer solution, injecting the polymer solution into a stratum before gelling, and performing cross-linking reaction in the stratum to form gel so as to plug a dominant seepage channel. In the application of a mine field, the pipeline, the injection pump and the porous medium have shearing action on the polymer solution, and the blocking effect of the crosslinked polymer gel is seriously influenced. The pre-crosslinked gel particles are a plugging agent which can expand after absorbing water and plug a dominant seepage channel, and compared with crosslinked polymer gel, the pre-crosslinked gel particles are slightly influenced by shearing action, but have poor injectability, and usually need to be crushed into fine particles or powder for injection, so that the plugging strength of the pre-crosslinked gel particles is seriously influenced.
At present, it is a feasible idea to inject a plugging agent solution into a stratum and polymerize the solution under the stratum condition so as to effectively plug a dominant seepage channel, but the plugging strength in the prior art needs to be improved. In the prior art, the dominant seepage channel is blocked only by using organic matters obtained by polymerization reaction, and the blocking effect on the stratum in which the dominant seepage channel develops is not ideal; in the prior art, N '-methylene bisacrylamide is adopted as a cross-linking agent, so that the obtained polymerization product has water absorption expansion performance, however, as two carbon-carbon double bonds in the N, N' -methylene bisacrylamide are close to each other, the size of a formed space network structure is small, the water absorption expansion multiple of the polymerization product is small, and the blocking strength of the obtained plugging agent needs to be enhanced.
Therefore, in order to effectively block the formation dominant seepage channel and effectively improve the water-drive reservoir development effect, a plugging modifier with good injectivity and high plugging strength needs to be developed, so that a high-strength plugging modifier and a preparation method thereof are provided, the water-drive reservoir development effect can be improved, the plugging modifier has good injectivity, and the plugging strength of the plugging modifier is improved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a high-strength plugging agent and a preparation method thereof, which can effectively improve the development effect of a water-drive reservoir, increase the water absorption expansion multiple of the plugging agent and improve the plugging strength of the plugging agent.
The purpose of the invention is realized by the following technical scheme:
a high-strength profile control agent comprises the following raw material components: acrylic acid, acrylamide, bentonite, a pH regulator, a cross-linking agent, an initiator and deionized water;
wherein the cross-linking agent is hexamethylene bisacrylamide.
Further, the initiator is 2,2' -azobisisobutylamidine dihydrochloride.
Further, the pH regulator is sodium hydroxide.
Further, the high-strength profile control agent is prepared from the following components:
5-10 parts of acrylic acid, 10-15 parts of acrylamide, 6-12 parts of bentonite, 2.775-5.55 parts of sodium hydroxide, 0.015-0.075 part of hexamethylene bisacrylamide, 0.045-0.125 part of 2,2' -azo diisobutyl amidine dihydrochloride and the balance of deionized water.
Further, the high-strength profile control agent is prepared from the following components:
8 parts of acrylic acid, 12 parts of acrylamide, 7 parts of bentonite, 4.44 parts of sodium hydroxide, 0.02 part of hexamethylene bisacrylamide, 0.08 part of 2,2' -azobisisobutylamidine dihydrochloride and the balance of deionized water.
The preparation method of the high-strength profile control agent comprises the following steps:
step a: adjusting the pH, adding part of deionized water and acrylic acid into a round-bottom flask, and adjusting the pH value to 6.8-7.5 by using sodium hydroxide to obtain a mixed solution after the pH is adjusted;
step b: adding acrylamide, bentonite and hexamethylene bisacrylamide into the mixed solution after the pH is adjusted, fully stirring, and then adding a certain amount of deionized water to prepare a suspension with the mass concentration of 25-30%;
step c: and introducing nitrogen into the suspension with the concentration of 25% -30% to remove oxygen, then adding an initiator 2,2' -azobisisobutylamidine dihydrochloride, and stirring to dissolve to obtain the high-strength plugging agent.
The high-strength plugging agent is injected into the stratum from an oil well or a water well, polymerization reaction and crosslinking reaction are initiated under the action of the temperature of the stratum, and the obtained product can absorb water to expand and effectively plug the dominant seepage channels in the stratum, so that the high-strength plugging agent has the effect of improving the production and absorption profile.
According to the scheme, hexamethylene bisacrylamide is introduced to effectively increase the water-absorbing expansion multiple of the plugging agent, wherein the carbon-carbon double bond distance of the hexamethylene bisacrylamide is far away, the size of a formed space net structure is large, the water-absorbing expansion multiple of a polymerization product is large, the increase of the size of the space net structure and the increase of the expansion multiple are accompanied, the plugging strength of the prepared plugging agent needs to be improved simultaneously, therefore, the scheme introduces inorganic material bentonite into the plugging agent in a mode of compounding with an inorganic material, namely the increased space net structure composite bentonite, and the plugging strength of the plugging agent can be effectively improved while the water-absorbing expansion multiple of the polymerization product is improved.
The invention has the beneficial effects that:
(1) the hexamethylene bisacrylamide with longer molecular chains is used as a cross-linking agent, the water absorption expansion multiple of the plugging agent can be increased, and the inorganic material bentonite is introduced by adopting a mode of compounding organic and inorganic materials, so that the water absorption expansion multiple is increased, and the plugging strength of the plugging agent is improved; (2) compared with ammonium persulfate-sodium bisulfite two-agent type initiator, the single-agent type initiator 2,2' -azobisisobutylamidine dihydrochloride is adopted, which is beneficial to the smooth initiation of polymerization reaction under the formation condition.
Drawings
FIG. 1 is an infrared spectrum of a high-strength profile control agent;
FIG. 2 is a graphical representation of the water swell times over time for the high strength profile control agent polymeric products prepared in examples 1, 2, 3;
fig. 3 is a schematic diagram showing the change of injection pressure with time in the plugging performance test of examples 1, 2 and 3.
Detailed Description
The technical solution of the present invention is further described in detail with reference to the following specific examples, but the scope of the present invention is not limited to the following.
Example 1
A high-strength profile control agent comprises the following components in parts by weight:
5 parts of acrylic acid, 10 parts of acrylamide, 6 parts of bentonite, 2.775 parts of pH regulator, 0.015 part of cross-linking agent, 0.045 part of initiator and the balance of 71.505 parts of deionized water;
wherein the cross-linking agent is hexamethylene bisacrylamide, and the initiator is 2,2' -azobisisobutylamidine dihydrochloride.
In this embodiment, the preferred pH adjusting agent is sodium hydroxide.
A preparation method of a high-strength profile control agent comprises the following steps:
step a, adjusting pH, adding part of deionized water and 5 parts of acrylic acid into a 500ml round-bottom flask, and adjusting the pH value to 6.8-7.5 by using 2.775 parts of sodium hydroxide to obtain a mixed solution after the pH is adjusted;
then, step b, adding 10 parts of acrylamide, 6 parts of bentonite and 0.015 part of hexamethylene bisacrylamide into the mixed solution after the pH is adjusted, fully stirring, and then adding the rest deionized water to prepare a suspension;
and finally, step c, introducing nitrogen into the suspension to remove oxygen to obtain the deaerated suspension, then adding 0.045 part of 2,2 '-azobisisobutylamidine dihydrochloride, and stirring to dissolve the 2,2' -azobisisobutylamidine dihydrochloride, thus obtaining the high-strength plugging agent.
Example 2
A preparation method of a high-strength profile control agent comprises the following steps:
firstly, the high-strength plugging agent is prepared by weighing the following raw materials in parts by weight:
8 parts of acrylic acid, 12 parts of acrylamide, 7 parts of bentonite, 4.444 parts of pH regulator, 0.025 part of cross-linking agent, 0.08 part of initiator and the balance of 81.126 parts of deionized water;
wherein the cross-linking agent is hexamethylene bisacrylamide, the pH regulator is sodium hydroxide, and the initiator is 2,2' -azobisisobutylamidine dihydrochloride.
Then, performing the step a to adjust the pH, adding part of deionized water and 8 parts of acrylic acid into a 500ml round-bottom flask, and adjusting the pH value to 6.8-7.5 by using 4.444 parts of sodium hydroxide to obtain a mixed solution after the pH is adjusted;
then, step b, adding 12 parts of acrylamide, 7 parts of bentonite and 0.025 part of hexamethylene bisacrylamide into the mixed solution after the pH is adjusted, fully stirring, and then adding the rest deionized water to prepare a suspension;
and finally, step c, introducing nitrogen into the suspension to remove oxygen to obtain the deaerated suspension, then adding 0.08 part of 2,2 '-azobisisobutylamidine dihydrochloride, and stirring to dissolve the 2,2' -azobisisobutylamidine dihydrochloride to obtain the high-strength plugging agent.
When the high-strength plugging agent is applied, the high-strength plugging agent is injected into a stratum from an oil well or a water well, polymerization reaction is initiated under the action of the temperature of the stratum, and a product obtained by the polymerization reaction can absorb water to expand so as to form effective plugging on a dominant seepage channel in the stratum. And the scheme adopts a mode of initiating polymerization after injection into the stratum, so that the shearing resistance and the injection performance of the plugging agent can be enhanced.
Example 3
A high-strength profile control agent comprises the following components in parts by weight:
10 parts of acrylic acid, 15 parts of acrylamide, 12 parts of bentonite, 5.55 parts of pH regulator, 0.075 part of cross-linking agent, 0.125 part of initiator and the balance of 99.75 parts of deionized water;
wherein the cross-linking agent is hexamethylene bisacrylamide, and the initiator is 2,2' -azobisisobutylamidine dihydrochloride.
In this embodiment, the preferred pH adjusting agent is sodium hydroxide.
A preparation method of a high-strength profile control agent comprises the following steps:
step a, adjusting pH, adding part of deionized water and 10 parts of acrylic acid into a 500ml round-bottom flask, and adjusting the pH value to 6.8-7.5 by using 5.55 parts of sodium hydroxide to obtain a mixed solution after the pH is adjusted;
then, step b, adding 15 parts of acrylamide, 12 parts of bentonite and 0.075 part of hexamethylene bisacrylamide into the mixed solution after the pH is adjusted, fully stirring, and then adding the rest deionized water to prepare a suspension;
and finally, step c, introducing nitrogen into the suspension to remove oxygen to obtain the deaerated suspension, then adding 0.125 part of 2,2 '-azobisisobutylamidine dihydrochloride, and stirring to dissolve the 2,2' -azobisisobutylamidine dihydrochloride to obtain the high-strength plugging agent.
Examples of the experiments
The high-strength profile control and plugging agents prepared in the embodiments 1, 2 and 3 are respectively initiated to polymerize, namely, the high-strength profile control and plugging agents prepared in the embodiments 1, 2 and 3 are respectively sealed and then are placed in a constant temperature box with the temperature of 60 ℃, and are taken out after 6 hours, and then are respectively dried and crushed, so that three parts of high-strength profile control and plugging agent polymerization products are correspondingly obtained.
The high strength profile control agent polymerization product obtained in the example 2 was analyzed by infrared spectroscopy, and three high strength profile control agent polymerization products obtained in the examples 1, 2 and 3 were measured for the water absorption expansion factor and the blocking performance, respectively.
(1) Infrared spectroscopic analysis
The infrared spectrum analysis working principle is as follows:
each molecule has a unique infrared absorption spectrum determined by its composition and structure, from which it can be structurally analyzed and characterized. The infrared absorption spectrum is generated by the continuous vibration and rotation of molecules, and the molecular vibration means that each atom in the molecules makes relative motion near an equilibrium position, and polyatomic molecules can form various vibration patterns. The energy of molecular vibration corresponds exactly to the photon energy of infrared rays, so that when the vibrational state of the molecules changes, infrared spectra can be emitted, and infrared absorption spectra can also be generated by exciting the molecules to vibrate due to infrared radiation. The energy of the vibration and rotation of the molecule is not continuous but quantized. However, the vibrational spectrum is banded in a band shape because a rotational transition is often accompanied in a vibrational transition of a molecule. The infrared spectrum of the molecule therefore belongs to the band spectrum.
The high-strength profile control agent polymerization product obtained by correspondingly preparing the product in example 2 is subjected to infrared spectrogram analysis, and the obtained high-strength profile control agent polymerization product is characterized in that:
as shown in FIG. 1, which is an infrared spectrogram of a polymerization product of the high-strength profile control agent, an N-H stretching vibration absorption peak is positioned at 3435cm-1(ii) a The C-H telescopic vibration absorption peak in methylene is positioned at 2922cm-1(ii) a The C-O telescopic vibration absorption peak is located at 1630cm-1(ii) a The C-H in-plane bending vibration absorption peak is at 1455m-1(ii) a The C-N stretching vibration absorption peak in the primary amide is positioned at 1408cm-1(ii) a The C-N stretching vibration absorption peak in the secondary amide is positioned at 1353cm-1(ii) a The C-O stretching vibration absorption peak in carboxyl is 1313cm-1(ii) a NH in primary amides2The in-plane vibration absorption peak is located at 1131cm-1(ii) a The characteristic absorption peak of the bentonite is positioned at 780cm-1And 566cm-1(ii) a NH in primary amides2The absorption peak of the out-of-plane swinging vibration is located at 616cm-1。
Therefore, the infrared absorption peaks of the groups contained in acrylic acid, acrylamide, bentonite and hexamethylene bisacrylamide are contained in the product, and the target product is obtained.
(2) The water swelling times of the high strength profile control agent polymerization products prepared in examples 1, 2 and 3 were measured, respectively:
10g of each of the high-strength profile control agent polymerization products prepared in examples 1, 2 and 3 was put into three beakers each containing 1000g of deionized water, the three beakers were sealed and placed in a 60 ℃ incubator, the three beakers were periodically taken out, and three portions of the high-strength profile control agent polymerization product after absorbing water were weighed. And (3) representing the expansion performance of the high-strength plugging agent polymerization product by adopting the water absorption expansion multiple, wherein the water absorption expansion multiple is the ratio of the mass of the high-strength plugging agent polymerization product after water absorption to the mass of the high-strength plugging agent polymerization product before water absorption. The experimental results of examples 1, 2 and 3 are shown in FIG. 2. From the experimental results, the water absorption expansion times of the high-strength profile control agent polymerization product are more than 21 times, and the high-strength profile control agent polymerization product has good water absorption expansion performance.
(3) Plugging performance of high strength profile control agent polymerizate:
respectively taking 200g of the high-strength profile control agent polymerization products prepared correspondingly in the examples 1, 2 and 3, and uniformly mixing with 800g of quartz sand with the particle size of 60-80 meshes to obtain three parts of quartz sand mixed with the high-strength profile control agent polymerization products, and filling the quartz sand mixed with the high-strength profile control agent polymerization products into a sand filling pipe (the diameter is 20cm, the inner diameter is 2cm), wherein the filling pressure is 6 MPa; deionized water was injected from the inlet end of the sand pack pipe at 60 c at a flow rate of 1ml/min using a constant-speed constant-flow pump, and the injection pressure was recorded, and the experimental results of examples 1, 2, and 3 are shown in fig. 3. From the experimental results, it was found that the injection pressure at the inlet end of the sand-packed pipe gradually increased, and after 10 hours, the injection pressure reached 1.8MPa or more, and then the injection pressure remained stable. Experimental results show that the high-strength plugging agent has good plugging performance.
The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. A high-strength profile control agent is characterized in that:
the raw material components of the profile control agent comprise: acrylic acid, acrylamide, bentonite, a pH regulator, a cross-linking agent, an initiator and deionized water;
wherein the cross-linking agent is hexamethylene bisacrylamide.
2. The high strength profile control agent according to claim 1, wherein: the initiator is 2,2' -azobisisobutylamidine dihydrochloride.
3. The high strength profile control agent according to claim 2, wherein: the pH regulator is sodium hydroxide.
4. The high-strength profile control agent according to claim 3, which is prepared from the following components:
5-10 parts of acrylic acid, 10-15 parts of acrylamide, 6-12 parts of bentonite, 2.775-5.55 parts of sodium hydroxide, 0.015-0.075 part of hexamethylene bisacrylamide, 0.045-0.125 part of 2,2' -azo diisobutyl amidine dihydrochloride and the balance of deionized water.
5. The high-strength profile control agent according to claim 4, which is prepared from the following components:
8 parts of acrylic acid, 12 parts of acrylamide, 7 parts of bentonite, 4.44 parts of sodium hydroxide, 0.025 part of hexamethylene bisacrylamide, 0.08 part of 2,2' -azobisisobutylamidine dihydrochloride and the balance of deionized water.
6. The method for preparing the high-strength profile control agent according to any one of claims 1 to 5, comprising the following steps:
a: adjusting the pH, adding part of deionized water and acrylic acid into a round-bottom flask, and adjusting the pH value to 6.8-7.5 by using sodium hydroxide to obtain a mixed solution after the pH is adjusted;
b: adding acrylamide, bentonite and hexamethylene bisacrylamide into the mixed solution after the pH is adjusted, fully stirring, and then adding a certain amount of deionized water to prepare a suspension with the mass concentration of 25-30%;
c: and introducing nitrogen into the suspension with the concentration of 25% -30% to remove oxygen, then adding an initiator 2,2' -azobisisobutylamidine dihydrochloride, and stirring to dissolve to obtain the high-strength plugging agent.
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