CN114109304A - Temporary plugging agent assisted carbon dioxide huff and puff oil production method - Google Patents
Temporary plugging agent assisted carbon dioxide huff and puff oil production method Download PDFInfo
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- CN114109304A CN114109304A CN202111412262.5A CN202111412262A CN114109304A CN 114109304 A CN114109304 A CN 114109304A CN 202111412262 A CN202111412262 A CN 202111412262A CN 114109304 A CN114109304 A CN 114109304A
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- plugging agent
- carbon dioxide
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 110
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 74
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 55
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 55
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 238000011084 recovery Methods 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 18
- 238000005345 coagulation Methods 0.000 claims abstract description 4
- 230000015271 coagulation Effects 0.000 claims abstract description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 27
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 13
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 13
- 239000008367 deionised water Substances 0.000 claims description 12
- 229910021641 deionized water Inorganic materials 0.000 claims description 12
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 11
- FSDNTQSJGHSJBG-UHFFFAOYSA-N piperidine-4-carbonitrile Chemical compound N#CC1CCNCC1 FSDNTQSJGHSJBG-UHFFFAOYSA-N 0.000 claims description 11
- JHUFGBSGINLPOW-UHFFFAOYSA-N 3-chloro-4-(trifluoromethoxy)benzoyl cyanide Chemical compound FC(F)(F)OC1=CC=C(C(=O)C#N)C=C1Cl JHUFGBSGINLPOW-UHFFFAOYSA-N 0.000 claims description 10
- 238000006116 polymerization reaction Methods 0.000 claims description 9
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 239000003999 initiator Substances 0.000 claims description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 5
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims description 4
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 4
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 239000003921 oil Substances 0.000 abstract description 27
- 239000010779 crude oil Substances 0.000 abstract description 10
- 230000035699 permeability Effects 0.000 abstract description 9
- 230000005465 channeling Effects 0.000 abstract description 4
- 238000000605 extraction Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 4
- 238000010521 absorption reaction Methods 0.000 description 10
- 239000000243 solution Substances 0.000 description 8
- 238000002474 experimental method Methods 0.000 description 7
- 239000002245 particle Substances 0.000 description 5
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 239000006260 foam Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000033558 biomineral tissue development Effects 0.000 description 2
- 229920006037 cross link polymer Polymers 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002329 infrared spectrum Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 2
- 238000005325 percolation Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002981 blocking agent Substances 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- SZXQTJUDPRGNJN-UHFFFAOYSA-N dipropylene glycol Chemical compound OCCCOCCCO SZXQTJUDPRGNJN-UHFFFAOYSA-N 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000008398 formation water Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 125000000325 methylidene group Chemical group [H]C([H])=* 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 150000003140 primary amides Chemical class 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/138—Plastering the borehole wall; Injecting into the formation
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- 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
- C09K8/5083—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/164—Injecting CO2 or carbonated water
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Geochemistry & Mineralogy (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
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Abstract
The invention belongs to the technical field of improving the recovery efficiency of medium and low permeability oil fields, and discloses a temporary plugging agent assisted carbon dioxide huff and puff oil production method, which comprises the following steps: injecting a temporary plugging agent slug, injecting clear water for replacement, and waiting for coagulation; injecting a carbon dioxide slug, and injecting clear water for replacement; stewing; and (5) well opening and production. The temporary plugging agent assisted carbon dioxide huff and puff oil extraction method provided by the invention can effectively plug the dominant seepage channel in the reservoir and prevent carbon dioxide from forming gas channeling along the dominant seepage channel, so that the swept volume of the carbon dioxide can be enlarged, and the carbon dioxide can enter a region enriched with residual oil and play a role; in the well opening production process, the temporary plugging agent can be degraded under the reservoir condition, so that permanent damage to the reservoir is avoided, the plugging strength is greatly improved, and the flow of the crude oil after the temporary plugging agent is taken out and taken out is facilitated. In addition, the temporary plugging agent assisted carbon dioxide huff and puff oil recovery method provided by the invention has the characteristics of simple process, wide application range and the like.
Description
Technical Field
The invention belongs to the technical field of improving the recovery efficiency of medium and low permeability oil fields, and particularly relates to a temporary plugging agent assisted carbon dioxide huff and puff oil production method.
Background
At present, the reserves of low and medium permeability oil fields in China are abundant, the low and medium permeability blocks which can establish a reasonable injection-production relationship are mainly developed in a water injection mode at present, and a large number of low and medium permeability blocks which are difficult to establish a reasonable injection-production relationship lack effective development means. The carbon dioxide huff and puff can play a role in supplementing stratum energy, reducing the tension of an oil-water interface, reducing the viscosity of crude oil and improving the fluidity ratio, so that the oil reservoir development effect can be improved, and the carbon dioxide huff and puff has application potential in the development of medium and low permeability oil fields.
However, due to the influence of reservoir heterogeneity and the dominant percolation channel, the carbon dioxide injected from the oil well forms a gas channeling along the dominant percolation channel, the sweep range of the carbon dioxide is greatly reduced, and the carbon dioxide cannot fully react with the crude oil in the residual oil rich region. Therefore, in order to improve the carbon dioxide throughput, the preferential seepage channels need to be effectively blocked before the carbon dioxide is injected.
The existing plugging agent mainly comprises a particle plugging agent and a foam plugging agent. The particle plugging agent has strong anti-shearing capability but poor injectability, and because each particle is dispersed, the plugging agent has poor plugging performance on the dominant seepage channel of the reservoir, has long plugging effective period and is not beneficial to the flow of crude oil after huff and puff. The cross-linked polymer gel plugging agent has good injection performance and high plugging strength, but is not anti-shearing, and after being sheared by pipelines, pumps and porous media, the plugging capability is greatly reduced, and the plugging validity period is longer. The foam plugging agent is shear resistant, the effective plugging period is moderate, but the plugging strength is low. Therefore, a dominant seepage channel plugging method suitable for carbon dioxide huff and puff of medium-low permeability oil fields needs to be researched.
Through the above analysis, the problems and defects of the prior art are as follows:
(1) the existing particle plugging agent has poor injectability, and because each particle is dispersed, the plugging agent has poor plugging performance on the dominant seepage channel of a reservoir, has long plugging effective period and is not beneficial to the flow of crude oil after huff and puff.
(2) The existing crosslinked polymer gel plugging agent is not anti-shearing, and after being sheared by pipelines, pumps and porous media, the plugging capability is greatly reduced, and the plugging validity period is longer.
(3) The prior foam plugging agent has moderate effective plugging period but low plugging strength.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a temporary plugging agent-assisted carbon dioxide huff and puff oil production method.
The invention is realized in such a way that a temporary plugging agent assists a carbon dioxide huff and puff oil production method, and the temporary plugging agent assists the carbon dioxide huff and puff oil production method comprises the following steps:
injecting a temporary plugging agent slug, injecting clear water for replacement, and waiting for coagulation;
injecting a carbon dioxide slug, and injecting clear water for replacement;
step three, soaking the well;
and step four, well opening production.
Further, in the first step, the temporary plugging agent slug is prepared from deionized water, acrylic acid, sodium hydroxide, acrylamide, sodium allylsulfonate, dipropylene glycol diacrylate and ammonium persulfate-sodium bisulfite initiator.
Further, in the first step, the structural formula of the temporary plugging agent slug is as follows:
wherein x, y, z, m, a, b and c are polymerization degrees.
Further, the molar ratio of the ammonium persulfate to the sodium bisulfite is 1: 1.
further, the mass percent of the acrylic acid is 7-12%; the adding amount of the sodium hydroxide is 55.5% of the adding amount of the acrylic acid, and the pH is adjusted to be 7-7.5; the addition of the acrylamide is 15-20%; the addition amount of the sodium allylsulfonate is 0.1 to 0.8 percent; the addition amount of the dipropylene glycol diacrylate is 0.1-0.4% of the total addition amount of the acrylic acid and the acrylamide; the total adding amount of the ammonium persulfate and the sodium bisulfite is 0.1 to 0.5 percent of the total adding amount of the acrylic acid, the acrylamide, the sodium allylsulfonate and the dipropylene glycol diacrylate, and the balance is deionized water, wherein the mass is gram.
Further, in the first step, the preparation method of the temporary plugging agent comprises the following steps:
adding deionized water and acrylic acid into a round-bottom flask, adjusting the pH value of the solution by using sodium hydroxide, adding acrylamide, sodium allylsulfonate and dipropylene glycol diacrylate, fully stirring, adding a certain amount of deionized water to prepare a solution, and introducing nitrogen to remove oxygen; ammonium persulfate-sodium bisulfite initiator is added and stirred to dissolve completely.
Further, the pH value of the solution is adjusted to 7-7.5 by using sodium hydroxide.
Further, the mass concentration of the solution prepared by adding deionized water is 25-30%.
Further, in the first step, the dosage of the temporary plugging agent slug is 10 t-50 t, the discharge capacity is 3 t/h-5 t/h, 20 t-30 t of clear water needs to be injected for replacement after the temporary plugging agent slug is injected, and then the temporary plugging agent slug is congealed for 5 h.
Further, in the first step, the dosage of the carbon dioxide slug is 200 t-500 t, the discharge capacity is 4 t/h-6 t/h, 20 t-30 t of clean water needs to be injected for replacement after the carbon dioxide slug is injected, and the well is opened for production after the well is stewed for 20 d-30 d.
By combining all the technical schemes, the invention has the advantages and positive effects that: the temporary plugging agent assisted carbon dioxide huff and puff oil extraction method provided by the invention can effectively plug the dominant seepage channel in the reservoir and prevent carbon dioxide from forming gas channeling along the dominant seepage channel, so that the swept volume of the carbon dioxide can be enlarged, and the carbon dioxide can enter a region enriched with residual oil and play a role; in the well opening production process, the temporary plugging agent can be degraded under the reservoir condition, so that the permanent damage to the reservoir is avoided, and the flow of the crude oil after the temporary plugging agent is taken out and taken out is facilitated. In addition, the invention has the characteristics of simple process, wide application range and the like.
The temporary plugging agent assisted carbon dioxide huff and puff oil extraction method provided by the invention can effectively plug the dominant seepage channel and prevent carbon dioxide from forming gas channeling along the dominant seepage channel, so that the swept volume of the carbon dioxide in an oil layer is enlarged, and more crude oil is extracted; meanwhile, the temporary plugging agent is used for forming plugging by initiating polymerization under the action of the formation temperature after being injected into a reservoir, so that the temporary plugging agent has good injectivity and shear resistance; because the instable cross-linking agent dipropylene glycol diacrylate is added into the temporary plugging agent, the temporary plugging agent can absorb water to expand after polymerization, and the plugging strength is greatly improved; in addition, after carbon dioxide is injected, the dipropylene glycol diacrylate is slowly hydrolyzed at the reservoir temperature, so that the plugging effect is eliminated, the plugging removal is realized, and the reservoir permeability recovery and the crude oil flow are facilitated; the introduction of sodium allylsulfonate into the temporary plugging agent can improve the salt resistance of the temporary plugging agent, so that the temporary plugging agent can be prepared by clear water or produced water, thereby enhancing the adaptability. In addition, the oil extraction method of the invention also has the advantages of wide application range, simple process and the like.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flow chart of a temporary plugging agent-assisted carbon dioxide huff and puff oil recovery method provided by an embodiment of the invention.
FIG. 2 is an IR spectrum of a polymerization product of a temporary plugging agent according to an embodiment of the present invention.
Fig. 3 is a graph of enhanced oil recovery as a function of production time provided by an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Aiming at the problems in the prior art, the invention provides a temporary plugging agent-assisted carbon dioxide huff and puff oil recovery method, which is described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the temporary plugging agent assisted carbon dioxide huff and puff oil recovery method provided by the embodiment of the invention comprises the following steps:
s101, injecting a temporary plugging agent slug, injecting clear water for replacement, and waiting for coagulation;
s102, injecting a carbon dioxide slug, and injecting clear water for replacement;
s103, soaking the well;
and S104, opening a well for production.
The technical solution of the present invention is further described below with reference to specific examples.
Example 1: preparation of temporary plugging agent
Adding 50g of deionized water and 10g of acrylic acid into a 500ml round-bottom flask, adjusting the pH value to 7-7.5 by using sodium hydroxide, adding 16g of acrylamide, 0.15g of sodium allylsulfonate and 0.03g of dipropylene glycol diacrylate, fully stirring, adding a certain amount of deionized water to prepare a solution with the mass concentration of 30%, and introducing nitrogen to remove oxygen; and adding 0.07g of ammonium persulfate-sodium bisulfite initiator, and stirring to dissolve the initiator to obtain the temporary plugging agent.
Example 2: polymerization of temporary blocking agents
The temporary plugging agent obtained in example 1 was sealed and placed in a thermostat at 60 ℃ for 24 hours, and then taken out, dried and pulverized to obtain a polymerization product of the temporary plugging agent.
Example 3: characterization of the temporary plugging agent polymerization product
The infrared spectrum of the polymerization product of the temporary plugging agent obtained in example 2 is shown in FIG. 2, and the N-H stretching vibration absorption peak is at 3434cm-1(ii) a The C-H stretching vibration absorption peak in methylene is positioned at 2927cm-1(ii) a The C-H antisymmetric telescopic vibration absorption peak in methyl is positioned at 2855cm-1(ii) a The C-O telescopic vibration absorption peak is located at 1629cm-1(ii) a The C-H in-plane bending vibration absorption peak in the methyl is 1460cm-1(ii) a The C-N stretching vibration absorption peak in the primary amide is positioned at 1407cm-1(ii) a The C-O stretching vibration absorption peak in carboxyl is located at 1325cm-1(ii) a C-O-C stretching vibration absorption in dipropylene glycol diacrylateThe peak is located at 1176cm-1(ii) a NH in primary amides2The in-plane rocking vibration absorption peak was located 1122cm-1；-SO3The characteristic absorption peak of Na is located at 616cm-1And 570cm-1。
Example 4: evaluation of temporary plugging agent for assisting carbon dioxide huff and puff to improve recovery efficiency
(1) Evaluation experiment of enhanced recovery efficiency: firstly, the core length is 20cm, the diameter is 2cm, the permeability is 153mD, the porosity is 26.2%, and the experiment is carried out at 90 ℃; secondly, enabling the rock core to saturate formation water with the mineralization degree of 7843mg/L at the flow rate of 5.0mL/min, and enabling the rock core to saturate crude oil (the viscosity at 90 ℃ is 25.7mPa.s) at the flow rate of 0.5mL/min, and aging for 48 hours; thirdly, displacing the crude oil in the core by clean water with the mineralization degree of 1525mg/L at the flow rate of 1.0mL/min until the water content reaches 80%; fourthly, injecting 2.5g of temporary plugging agent slug reversely at the flow rate of 1.0mL/min, then replacing 1.0g of clear water at the flow rate of 1.0mL/min, and waiting for 5 hours; injecting 4.5g of carbon dioxide at a flow rate of 0.5mL/min in a reverse direction, and replacing 1.0g of clear water at a flow rate of 1.0 mL/min; closing the inlet and outlet valves of the rock core, standing at 90 deg.C for 30d, measuring oil output and calculating recovery ratio.
And (4) carrying out a carbon dioxide huff and puff experiment, wherein the temporary plugging agent is not injected in the experiment process, and other experiment conditions are the same.
(2) Evaluation of the results of the experiment: as can be seen from FIG. 3, the temporary plugging agent is implemented to assist carbon dioxide huff and puff and then production is carried out, the recovery ratio is increased by 13.0%, and the recovery ratio is increased by 8.9% in a single carbon dioxide huff and puff experiment, which shows that the temporary plugging agent assists carbon dioxide huff and puff and has strong oil increasing capability.
The above description is only for the purpose of illustrating the present invention and the appended claims are not to be construed as limiting the scope of the invention, which is intended to cover all modifications, equivalents and improvements that are within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The temporary plugging agent-assisted carbon dioxide huff and puff oil production method is characterized by comprising the following steps of:
injecting a temporary plugging agent slug, injecting clear water for replacement, and waiting for coagulation;
injecting a carbon dioxide slug, and injecting clear water for replacement;
step three, soaking the well;
and step four, well opening production.
2. The temporary plugging agent assisted carbon dioxide huff and puff oil recovery method of claim 1, wherein in step one, the temporary plugging agent slug is prepared from deionized water, acrylic acid, sodium hydroxide, acrylamide, sodium allylsulfonate, dipropylene glycol diacrylate and ammonium persulfate-sodium bisulfite initiator.
3. The temporary plugging agent assisted carbon dioxide huff and puff oil recovery method according to claim 1, wherein in the first step, the temporary plugging agent slug has the following structural formula:
wherein x, y, z, m, a, b and c are polymerization degrees.
4. The temporary plugging agent assisted carbon dioxide huff and puff oil recovery method according to claim 2, wherein the molar ratio of ammonium persulfate to sodium bisulfite is 1: 1.
5. the temporary plugging agent assisted carbon dioxide huff and puff oil recovery method according to claim 2, wherein the acrylic acid is 7-12% by weight; the adding amount of the sodium hydroxide is 55.5% of the adding amount of the acrylic acid, and the pH is adjusted to be 7-7.5; the addition of the acrylamide is 15-20%; the addition amount of the sodium allylsulfonate is 0.1 to 0.8 percent; the addition amount of the dipropylene glycol diacrylate is 0.1-0.4% of the total addition amount of the acrylic acid and the acrylamide; the total adding amount of the ammonium persulfate and the sodium bisulfite is 0.1 to 0.5 percent of the total adding amount of the acrylic acid, the acrylamide, the sodium allylsulfonate and the dipropylene glycol diacrylate, and the balance is deionized water, wherein the mass is gram.
6. The temporary plugging agent-assisted carbon dioxide huff and puff oil recovery method according to claim 1, wherein in the first step, the preparation method of the temporary plugging agent comprises the following steps:
adding deionized water and acrylic acid into a round-bottom flask, adjusting the pH value of the solution by using sodium hydroxide, adding acrylamide, sodium allylsulfonate and dipropylene glycol diacrylate, fully stirring, adding a certain amount of deionized water to prepare a solution, and introducing nitrogen to remove oxygen; ammonium persulfate-sodium bisulfite initiator is added and stirred to dissolve completely.
7. The temporary plugging agent-assisted carbon dioxide huff and puff oil recovery method according to claim 6, wherein the pH value of the solution is adjusted to 7-7.5 by sodium hydroxide.
8. The temporary plugging agent-assisted carbon dioxide huff and puff oil recovery method according to claim 6, wherein the mass concentration of the solution prepared by adding deionized water is 25-30%.
9. The temporary plugging agent assisted carbon dioxide huff and puff oil recovery method as claimed in claim 1, wherein in the first step, the usage amount of the temporary plugging agent slug is 10 t-50 t, the discharge amount is 3 t/h-5 t/h, 20 t-30 t of clean water needs to be injected for replacement after the temporary plugging agent slug is injected, and then the temporary plugging agent slug is congealed for 5 h.
10. The temporary plugging agent assisted carbon dioxide huff and puff oil recovery method as claimed in claim 1, wherein in the first step, the dosage of the carbon dioxide slug is 200 t-500 t, the discharge capacity is 4 t/h-6 t/h, 20 t-30 t of clean water needs to be injected for replacement after the carbon dioxide slug is injected, and the well is opened for production after the well is stewed for 20 d-30 d.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115558053A (en) * | 2022-10-13 | 2023-01-03 | 长江大学 | Gel temporary plugging agent and preparation method and application thereof |
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